United States
         Environmental Protection
         Agency
Prevention, Pesticides
And Toxic Substances
(7508W)	
EPA 738-R-98-006
July 1998
4>EPAl  Reregistration
         Eligibility Decision (RED)

         Zinc Phosphide

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                  United States
                  Environmental Protection
                  Agency
                         Prevention, Pesticides
                         And Toxic Substances
                         (7508W)
EPA-738-F-98-703
July 1998
                  R.E.D.   FACTS
     Pesticide
Reregistration
   Use Profile
  Zinc  Phosphide


      All pesticides sold or distributed in the United States must be registered
  by EPA, based on scientific studies showing that they can be used without
  posing unreasonable risks to people or the environment. Because of advances
  in scientific knowledge, the law requires that pesticides that were first
  registered before November 1, 1984, be reregistered to ensure that they meet
  today's more stringent standards.
      In evaluating pesticides for reregistration, EPA obtains and reviews a
  complete set of studies from pesticide producers, describing the human health
;  and environmental effects of each pesticide. To implement provisions of the
  Food Quality Protection Act of 1996, EPA considers the special sensitivity of
  infants and children to pesticides, as well as aggregate exposure of the public
  to pesticide residues from all sources, arid the cumulative effects of pesticides
  and other compounds with common mechanisms of toxicity. The Agency
  develops any mitigation measures or regulatory controls needed to effectively
  reduce each pesticide's risks.  EPA then reregisters pesticides that meet the
  safety standard of the FQPA and can'be used without posing unreasonable
  risks to human health or the environment.
      When a pesticide is eligible for reregistration, EPA explains the basis for
  its decision in a Reregistration Eligibility Decision (RED) document. This fact
  sheet summarizes the information in the RED document for reregistration case
  0026, zinc phosphide.

      Zinc phosphide is a rodenticide used to control gophers, mice, rats,
 lagomorphs (e.g. jack rabbits), prairie dogs, and squirrels. Zinc phosphide has
 indoor and outdoor uses, which are classified as food and non-food depending
 upon the application method and label restrictions. Food uses of zinc
 phosphide include: grapes, rangeland grasses, sugarcane and regional uses on
 artichokes and sugar beets. Non-food uses include: indoor and outdoor  '•
 residential and agricultural areas (including in and around homes, on lawns,
 around bulbs, indoor and outdoor commercial or institutional premises, golf
 courses, alfalfa, barley, berries ('dormant), oats, sugar maple, wheat, no-till
 corn, orchards/groves (postharvest and dormant), timothy (hay).
     Formulations include solid baits, tracking powders and dusts intended for
 mixing into baits. Zinc phosphide is applied by hand, machine spreader,

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    Regulatory
         History
cyclone seeder, and aircraft. Use practice limitations are numerous and vary by
site, including a prohibition against livestock feeding in treated areas.

     Zinc phosphide was first registered as a pesticide in the U.S. in 1947.
EPA issued a Registration Standard for zinc phosphide in June 1982 (PB85-
102499). A Data Call-in Notice (DCI) was issued in 1987 and another in 1991
requiring further data for reregistration.  Following the issuance of the 1991
DCI, the Zinc Phosphide Consortium was formed. The consortium is made up
of technical, formulator, as well as end-use product registrants. The USDA
APHIS (Animal and Plant Health Inspection Service) is the consortium leader.
Currently, 59 zinc phosphide products are registered.
Human Health
  Assessment
                    Benefits
                          Toxic rodenticides are the most efficient available means for controlling
                    existing infestations of large numbers of pest rodents. These agents also may
                    be the method of choice in controlling certain smaller rodent infestations and
                    often are needed to control rodents that cannot be removed by use of traps.
                    When buildings, including residences, are heavily infested, poisoning generally
                    is an integral component of successful abatement programs.
                          Rodents transmit various diseases either directly or indirectly, via
                    ectoparasites such as fleas, ticks or mites, or bodily waste products and
                    secretions. Approximately  14,000 humans are bitten by rats each year.
                          "Field" rodents such as ground squirrels, voles, and native mice and rats
                    cause significant damage to crops and rangelands. Certain crops, such as
                    sugarcane, are heavily damaged in the field by rats and mice. Zinc phosphide
                    plays an important role in the management of rodents associated with
                    agricultural crops.
Toxicity
     In studies using laboratory animals, zinc phosphide is Toxicity Category
I (the highest of four categories) for acute effects via the oral or inhalation
route of exposure, Toxicity Category III (the second lowest of four categories)
for the dermal route, and Toxicity Category IV (the lowest of four categories)
for eye irritation.
                    Dietary Exposure
                          Although zinc phosphide is used in and around food crops, people are
                    expected to be exposed to minimal residues of zinc phosphide through the diet
                    because of its rapid degradation and restrictive application methods.  Based on
                    application method and label use restrictions, artichokes (globe), grapes,
                    rangeland grasses, sugar beets  and sugarcane are considered food uses.
                    Tolerances or maximum residue limits have been established for these

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  commodities (please see 40 CFR 180.284).  EPA has reassessed the zinc
  phosphide tolerances and found that all are acceptable, and that a new
  tolerance must be established for grasses, hay.
      : No Codex Maximum Residue Limits have been established for zinc
  phosphide, therefore, issues of compatibility between Codex MRLs and U.S.
  tolerances do not exist.
       Because zinc phosphide residues on food are expected to be minimal to
  non-existent, EPA has not assessed the dietary risk posed by zinc phosphide.
  If additional uses be submitted for registration in the future that result in
  residues on food, then a risk assessment will be conducted at that time.

  Occupational and Residential Exposure,
       Based on current use patterns, handlers (mixers, loaders, and applicators)
  may be exposed to zinc phosphide during and after normal use of bait and dust
  formulations.  •                                                .
 Human Risk Assessment
       Almough zinc phosphide is primarily used in agricultural and non-
 residential settings, rodenticides, in general, that are used in and around the
 home are responsible for a high number of accidental exposures each year.
 EPA is concerned about the continued risk of exposure to humans, especially
 children, from rodenticides used in residential settings as well as the cost and
 trauma associated with treating those who might have been accidentally
 exposed. Although few reported incidents are associated with zinc phosphide,
 the Agency believes that the common use pattern should be the primary
 determining factor shaping the regulatory decision regarding these rodenticides
 used in and around the home. Additionally, a margin of exposure (MOE) of
 0.5 was calculated for zinc phosphide based on an acute heurotoxicity study
 and accidental ingestion of the bait formulation by a child.  Generally, the
 Agency seeks to ensure that exposures have an MOE of 100 or greater, the
, Agency has also determined that a single swallow of zinc phosphide bait may
 be fatal to a young child.        .
      Zinc phosphide has not been classified for carcinogenicity. Since dietary
 exposure to zinc phosphide residues in foods is negligible, no cancer risk is
 expected for the general population.
      Although the Agency has not identified any endpoints of concern from
 which to perform a handler exposure and risk assessment, it is concerned for
 inhalation exposure of occupational workers to the particulate fines or dust
 that may be generated from the mixing and loading of the dust-concentrate or
 wettable-powder formulations and from applying the pellet and bait
 formulations.  The Agency is confident that current labeling restrictions, when
 combined with those required by this document, are adequate and will require
these formulation-specific protections for all appropriate products.

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                          Exposure to workers will be mitigated by the use of PPE required by this
                     RED, including: long-sleeve shirt and long pants, shoes plus socks, chemical-
                     resistant gloves made of any waterproof material, and a dust/mist filtering
                     respirator (for mixers and loaders, MSHA/NIOSH approval number prefix TC-
                     21C).

                     FQPA Considerations
                          No drinking water risk assessment was performed for zinc phosphide
                     because no residues are expected in either ground or surface water due to the
                     pesticide's rapid degradation and limited usage.
                          Although zinc phosphide may share a common mode of toxicity (the
                     generation of phosphine gas) with other chemicals, the Agency has determined
                     that any future cumulative risk determination involving these chemicals will not
                     include the uses of zinc phosphide discussed in this document. This
                     determination is based on the fact that exposures to phosphine from zinc
                     phosphide in food or water are negligible due to zinc phosphide's rapid
                   •  degradation and limited use patterns.
                          Tolerances with amendments and changes specified in the RED
                     document meet the FQPA safety standard for the general population and
                     infants and children.
Environmental
   Assessment
Environmental Fate
     The Agency has determined that a review of available literature is
sufficient to assess the'environmental fate of zinc phosphide, therefore, few
guideline studies were required.  The major route of degradation/dissipation of
zinc phosphide is hydrolysis, which results in the formation of volatile
phosphine and zinc ions. Zinc phosphide and its residues appear to be non-
persistent under most environmental conditions and relatively immobile (zinc
ions and dissolved phosphorus readily sorb onto soil) in laboratory and field
data. When applied to dry soil environments, zinc phosphide may be
moderately persistent (=40% of applied remaining at 30 days post-treatment).
The rates of hydrolysis and volatilization of phosphine appear to be pH and soil
moisture dependent with the hydrolysis rate increasing as the pH increases or
decreases from neutrality. Zinc phosphide and its degradation products appear
to have a low potential for ground water or surface water contamination.
                     Ecological Effects
                          The Agency has determined that zinc phosphide is highly toxic to avian
                     species (Bobwhite quail) on an acute oral and on a subacute dietary basis. The
                     results from studies also indicate that zinc phosphide is highly to very highly
                     toxic to small mammals on an acute oral basis. Due to the fatal nature of zinc
                     phosphide poisonings, chronic studies are not necessary.

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                        .   The Zinc Phosphide Consortium is currently conducting two terrestrial
                     field studies. One study is to determine the residues available on alfalfa
                     following broadcast applications of a 2% bait in flood irrigated and sprinkler
                     irrigated alfalfa fields. The other study is to determine nontarget hazards to
                     pheasants in alfalfa fields that have been treated with a broadcast application of
                     2% zinc phosphide. The testing is expected to be completed within a year.
Risk Mitigation
Environmental Risk Characterization          ,
     The Agency has concluded from the studies reviewed, many of which are
not guideline studies, that the use of zinc phosphide in agricultural fields will
likely kill nontarget birds and mammals. Zinc phosphide is a very toxic
substance and will kill most animals to which it is administered. Rx>dents are
more sensitive than carnivores. Gallinaceous birds (pheasants, turkeys, other
large terrestrial birds) are more sensitive than other avian species, however,
some passerines (songbirds) are also sensitive.
     The Agency also concludes that predators or scavengers who eat a target
animal that has been killed by zinc phosphide will not die, however, they may
become ill, listless, and regurgitate.         s

     To mitigate the potential risk to children from accidental ingestion of
baits, the Agency is requiring several  mitigation measures to be implemented in
two phases. During Phase I the Agency will require zinc phosphide products,
as well as those of several other rodenticides, to incorporate indicator dye (to
help identify whether a child or pet has actually consumed the pesticide) and
bittering agents into their formulations. These formulation changes are
required of all zinc phosphide products^ except for those used exclusively in an
agricultural setting. In addition, registrants must update their product labels to
include the protective statements addressed in Section V of the RED.  During
Phase IIEPA will form a stakeholder group (including industry, states, various
poison control centers, rodent control experts, the medical community and
other interested parties)  to develop additional  means of significantly reducing
exposures to children and pets. It is the Agency's intent that within nine
months or less from the  issuance of the RED, the stakeholder group will
conclude with recommendations to the Agency on how to mitigate risk to
children and pets.  Possible outcomes of this group include: requiring all
rodenticide baits used in residential settings to be placed in disposable, child-
resistant bait stations or  equivalently protective mechanisms; develop an
exhaustive educational and outreach program  for consumers and enhanced
training for certified applicators; tamper-resistant bait stations; and additional
labeling improvements.  To monitor the effectiveness  of the mitigation
measures implemented during both phases, the Agency is requiring registrants
to submit annual National Poison Control Center Data for years 1999 through
2009.  Registrants are encouraged to share the cost of generating data and new
technologies, whenever  appropriate.           '

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    Additional Data
            Required
   .   To mitigate the potential exposure of the rodenticide to non-target
animals in an agricultural setting, the Agency is retaining the requirement that
all zinc phosphide products labeled for field use (except those limited to
underground-baiting for pocket gophers and moles) must be restricted to use
by pesticide certified applicators, or persons under their direct supervision.
      Because the use of zinc phosphide will still present a hazard to non-
target animals, the Agency is seeking ways to minimize exposure to these
animals.  The Agency is especially concerned about the broadcast use of zinc
phosphide as it allows large tracts of land to be treated. However, the
available data do not show that hand-baiting will necessarily result in reduced
exposure to non-target animals. Rather than impose specific use restrictions at
this time, the Agency is continuing its evaluation of the risks associated with
hand baiting versus broadcast applications and may impose additional data
requirements or label amendments at a later date.

      EPA is requiring the following additional generic studies for zinc
phosphide to confirm its regulatory assessments and conclusions:
      72-la  Acute Fish Toxicity (bluegill sunfish)
      72-Ic  Acute Fish Toxicity (rainbow trout)
      72-2  Acute Aquatic Invertebrate Toxicity
      171-4e Storage Stability
      171-4k Crop Field Trials
                               The Agency also is requiring product-specific data including product
                          chemistry and acute toxicity studies, revised Confidential Statements of
                          Formula (CSFs), and revised labeling for reregistration.

  Product Labeling        All zinc phosphide end-use products must comply with EPA's current
Changes Required   pesticide product labeling requirements and with the comprehensive list of
                          labeling requirements required in Section V of the zinc phosphide RED
                          document.
                          End-Use Products 8-Month Submission
                               All registrants of zinc phosphide products must submit revised
                          Confidential Statement of Formula (CSF) and draft labeling to the Agency
                          reflecting all changes noted in Section V, except for changes in formula or
                          labeling related to indicator dye, bittering agent or special child risk warning.
                          The details of these requirements, which do not apply to products used
                          exclusively in agricultural settings, will be an outgrowth of a meeting held 30
                          days after the issuance of the RED document.

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 Regulatory
Conclusion
   For More
Information
 Stakeholder Meetings
                               i                 '         '
      The Agency is planning to hold the initial stakeholders meeting within
 120 days' from the issuance of this RED in Washington, DC. As mentioned
 earlier, these meetings will provide an open forum to develop workable'  .
 mitigation measures to adequately protect children from accidental rodenticide
 exposures.  For these meetings to be most efficient and successful, all
 interested parties and viewpoints will be welcomed and considered. The
 outcomes of these meetings will affect all rodenticide products with residential
 uses, including those that were previously reregistered and those that have
 been registered more recently and, hence, are not subject to reregistration.

      The use, of currently registered products containing zinc phosphide in
 accordance  with approved labeling will not pose unreasonable risks or adverse
 effects to humans or the environment. Therefore, all uses of these products are
 eligible for reregistration.
      Zinc phosphide products will be reregistered once the required product-
 specific data, revised Confidential Statements of Formula, and revised labeling
 are received and accepted by EPA.
      EPA is requesting public comments on the Reregistration Eligibility
 Decision (RED) document for zinc phosphide during a 60-day time period, as
 announced in a Notice of Availability published in the Federal Register. To
 obtain a copy of the RED document of to submit written comments, please
 contact the Pesticide Docket, Public Information and Records Integrity
 Branch, Information Resources and Services Division (7502C), Office of
 Pesticide Programs (OPP), US EPA, Washington, DC 20460, telephone 703-
 305-5805.
      Electronic copies of the RED and this fact sheet are available on the
 Internet. See http://www.epa.gov/REDs.
      Printed copies of the RED and fact sheet can be obtained from EPA's
 National Center for Environmental Publications and Information
 (EPA/NCEPI), PO Box 42419, Cincinnati, OH 45242-2419, telephone 1-800-
 490-9198;  fax 513-489-8695.
      Following the  comment period, the zinc phosphide RED document also
 will be available from the National Technical Information Service (NTIS),
 5285 Port Royal Road, Springfield, VA 22161, telephone 703-605-6000.'
      For more information about EPA's pesticide reregistration program, the
 zinc phosphide RED, or reregistration of individual products containing zinc
phosphide, please contact the Special Review and Reregistration Division
 (7508W), OPP, US EPA, Washington, DC 20460, telephone 703-308-8000.
      For information about the health effects of pesticides, or for assistance in
recognizing and managing pesticide poisoning symptoms, please contact the

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National Pesticides Telecommunications Network (NPTN). Call toll-free 1-
800-858-7378, from 6:30 am to 4:30 pm Pacific time, or 9:30 am to 7:30 pm
Eastern Standard Time, seven days a week.

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(sffif)
                   UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                                       WASHINGTON, B.C. 20460
                                                                            OFFICE QF
                                                                        PREVENTION, PESTICIDES
                                                                       : AND TOXIC SUBSTANCES
CERTIFIED MAIL
                                                                     /t<3   3  IS98
Dear Registrant:

       I am pleased to announce that the Environmental Protection Agency has completed its
reregistration eligibility review and decisions on the pesticide chemical case zinc phosphide. The
enclosed Reregistration Eligibility Decision (RED), which was approved on September 30, 1997,
contains the Agency's evaluation of the data base of these chemicals, its conclusions of the
potential human health and environmental risks of the current product uses, and its. decisions and
conditions under which these uses and products will be eligible for reregistration.. The RED
includes the data and labeling requirements for products for reregistration. It also includes
requirements for additional generic data on zinc phosphide to confirm the risk assessments.

 v      To assist you with a proper response, read the enclosed document entitled "Summary of
Instructions for Responding to the RED." This summary also refers to other enclosed documents
which include further instructions.  You must follow all instructions and submit complete and
timely responses.  The first set of required responses is due 90 days from the date of your
receipt of this letter. The second set of required responses is due 8 months from the date of
your receipt of this letter. Complete and timely responses will avoid the Agency taking the
enforcement action of suspension against your products. .

       Please note that the Food Quality Protection Act of 1996 (FQPA) became effective on
August 3,  1996, amending portions of both pesticide  law (FIFRA) and the food and drug law
(FFDCA).  This RED takes into account, to the extent currently possible, the new safety standard
set by FQPA for establishing and reassessing tolerances. However, it should be noted that in
continuing to make reregistration determinations during the early stages of FQPA implementation,
EPA recognizes that it will be necessary to make decisions relating to FQPA before the
implementation process is complete. In making these early case-by-case decisions, EPA does not
intend to set broad precedents for the application of FQPA.  Rather, these early determinations
will, be made on a case-by-case basis and will not bind EPA as it proceeds with further policy
development and any rulemakirig that  may be required.                            -

       If EPA determines, as a result of this later implementation process, that any of the
determinations described in this RED are no longer appropriate, the Agency will pursue whatever

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action may be appropriate, including but not limited to reconsideration of any portion of this
RED.

       If you have questions on the product specific data requirements or wish to meet with the
Agency, please contact the Special Review and Reregistration Division representative Mr. Frank
Rubis at (703) 308-8184. Address any questions on required generic data to the Special Review
and Reregistration Division representative Ms. Susan Jennings at (703) 308-7130.
                                                       Sincerely yours,
Enclosures
                                                         )is A. $ossi, Director
                                                       'Special Review and
                                                        Reregistration Division

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              SUMMARY OF INSTRUCTIONS FOR RESPONDING TO
              THE REREGISTRATION ELIGIBILITY DECISION (RED)

 1.  DATA CALL-IN (PCI) OR "90-DAY RESPONSE"-If generic data are required for
 reregistration, a DCI letter will be enclosed describing such data.  If product specific data are
 required, a DCI letter will be enclosed listing such requirements.  If both generic and
 product specific data are required, a combined Generic and Product Specific DCI letter will
 be enclosed describing such data.  However, if you are an end-use product registrant only and
,have been granted a generic data exemption (GDE) by EPA, you are being sent only the
 product specific response forms (2 forms) with the RED.  Registrants responsible for generic
 data are being sent response forms for both generic and product specific data requirements (4
 forms). You must submit the appropriate response forms (following the instructions
 provided) within 90 days of the receipt of this RED/DCI letter; otherwise, your product
 may be suspended.

 2.  TIME EXTENSIONS AND DATA WAIVER REQUESTS-No time extension requests
 will be granted for the 90-day response. Time extension requests may be submitted only with
 respect to actual data submissions.  Requests for time extensions for product specific data
 should be submitted in the 90-day response.  Requests for data waivers must be submitted as
part of the 90-day response.  All data waiver and time extension requests must be accompanied
by a full justification. All waivers and time extensions must be granted by EPA in order to go
into effect.

 3.  APPLICATION FOR REREGISTRATION OR "8-MONTH RESPONSE"--You must
submit the following items for each product within eight months of the date of this letter
 (RED issuance date).

       a.  Application for Reregistration (EPA Form 8570-1).  Use only'an original
application form.  Mark it "Application for Reregistration."  Send your Application for
Reregistration (along with the other forms listed in b-e below) to the address listed in item 5.

       b.  Five copies of draft labeling which complies with the RED and current regulations
and requirements. Only make  labeling changes Which are required by the RED and current
regulations (40 CFR 156.10) and policies. Submit any other amendments (such as formulation
changes, or labeling changes not related to reregistration) separately.  You may, but are not
required to, delete uses which the RED says are ineligible for reregistration.  For further
labeling guidance, refer to the labeling section of the EPA publication "General Information on.
Applying for Registration in the U.S., Second Edition, August 1992" (available from the
National Technical Information Service, publication #PB92-221811;,telephone number 703-
487-4650).  ..••'..                                                      -

       c.  Generic or Product Specific Data. Submit all data in a format which complies
with PR Notice 86-5, and/or submit citations of data already submitted and give the EPA
identifier (MRID) numbers.  Before citing these studies, you must make sure that they meet
the Agency's acceptance criteria (attached to the DCI).

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       d.  Two copies of the Confidential Statement of Formula (CSF) for each basic and
 each alternate formulation.  The labeling and CSF which you submit for each product must
 comply with P.R. Notice 91-2 by declaring the active ingredient as the nominal
 concentration.  You have two options for submitting a CSF: (1) accept the standard certified
 limits (see 40 CFR §158.175) or (2) provide certified limits that are supported by the analysis
 of five batches.  If you choose the second option, you must submit or cite the data for the five
 batches along with a certification statement as described in 40 CFR §158.175(e).  A copy of
 the CSF is enclosed; follow the instructions on its back.

       e.  Certification  With Respect to Data Compensation  Requirements.  Complete and
 sign EPA forms 8570-34 and 8570-35 for each product. v

 4.  COMMENTS IN RESPONSE TO FEDERAL REGISTER NQTICE-Comments
 pertaining to the content  of the RED may be submitted to the address shown in the Federal
 Register Notice which announces the availability of this RED:

 5.  WHERE TO SEND  PRODUCT SPECIFIC PCI RESPONSES (90-DAY) AND
 APPLICATIONS FOR  REREGISTRATION (8-MONTH RESPONSES)

 By  U.S. Mail;

       Document Processing Desk  (RED-SRRD-PRB)
       Office of Pesticide Programs (7504C)
       EPA, 401 M St. S.W.
       Washington, D.C. 20460-0001

 By  express:

       Document Processing Desk  (RED-SRRD-PRB)
       Office of Pesticide Programs (7504C)
       Room 266A, Crystal Mall 2
       1921 Jefferson  Davis Hwy.
       Arlington, VA  22202

6. EPA'S REVIEWS—EPA will screen all submissions for completeness; those which are not
complete will be returned with a request for corrections.  EPA will try to respond to data
waiver and time extension requests  within 60 days.  EPA will also try to respond to all 8-
month submissions with a final reregistration determination within 14 months after the RED
has  been issued.

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REREGISTRATION ELIGIBILITY DECISION



          ZINC PHOSPHIDE



               LIST A



             CASE 0026

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                        TABLE OF CONTENTS
ZINC PHOSPHIDE REREGISTRATION ELIGIBILITY DECISION TEAM  ....... i

ABSTRACT . . . ............ . . '.'. . . .... ;	^................... v

I.    INTRODUCTION ..........:	  ...../..:.:...!

II.   CASE OVERVIEW	'.	   	 .'.'...		2
     A.    Chemical Overview	 2
     B.    Use Profile	 2
     C.    Estimated Usage of Pesticide	3
     D.    Data Requirements and Regulatory History	... 4

III.  SCIENCE ASSESSMENT ., . .'.	 . . . . .-. .'. . . .  . : . . ,	 .5
     A.    Physical Chemistry Assessment	 .  ....... 5
     B.    Human Health Assessment	6
           1.    Toxicology Assessment	'. . 6
                a.    Acute Toxicity	.......:......... 6
                b.    Subchronie Toxicity .,...."	7
                c.    Chronic Toxicity and Carcinogenicity ..'.".-	 . 7
                d.    Developmental Toxicity	, . .	 7
                e.    Reproductive Toxicity	 7
                f.     Mutagenicity  ............... . .	 8
                g.    Metabolism	 8
                h.    Neurotoxicity	 8
           2.    Toxicological Endpoints for Risk Assessment .  . . . . . . .  . . . . .  .10
                a.    Acute Dietary	 10
,                b.    Short and Intermediate Term Occupational Endpoints  .. 10
                c.    Chronic Occupational/Residential (Non-Cancer) Endpoints
                       	:....:..'.'.",......... n
                d.    Reference Dose . . .	 11
                e.    Carcinogenic Classification ..................... 11
           3.    Dietary Exposure, Risk Assessment and Characterization  	11
                a.    Dietary Exposure from Food Sources .	 11
                b.    Dietary Exposure from Drinking Water  . .	 16
                c.    Dietary Risk Assessment and Characterization ........ 16
           4.    Occupational and Residential Exposure, Risk Assessment and
                Characterization .'..'	 17
                a.    Occupational and Residential Exposure  ............. 17
                b.    Occupational and Residential Risk
                      Assessment/Characterization .................;.. 18

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            5.    Food Quality Protection Act Considerations  . . .  .	20
                  a.    Potential Risks to Infants and Children	20
                  b.    Aggregate Exposure	21
                  c.    Cumulative Risk .-.	22
      C.    Environmental Assessment	23
            1.    Environmental Fate	 . .	23
                  a.    Environmental Chemistry, Fate and Transport	24
                  b.    Environmental Fate Assessment	:	26
            2.    Ecological Effects	 26
                  a.    Toxicity to Terrestrial Animals	26
                  b.    Toxicity to Freshwater Aquatic Animals	29
            3.    Exposure and Risk Characterization	 30

IV.   RISK MANAGEMENT AND REREGISTRATION DECISION	34
      A.    Determination of Eligibility	• •  • •	 34
      B.    Determination of Eligibility Decision	34
            1.    Eligibility Decision	   	34
            2.    Eligible and Ineligible Uses  . .	 35
      C.    Regulatory Position	 35
            1.    Food Quality Protection Act Findings	35
            2.    Benefits of Rodenticides	38
            3.    Tolerance Reassessment		39
            4.    Codex Harmonization	40
            5.    Summary of Risk Management Decisions	41
                  a.    Human Health		41
                  b.    Environmental/Ecological Effects	46
                  c.    Restricted Use Classification	 47
                  d.    Endangered Species Statement	 47
                  e.    Occupational/Residential Labeling Rationale .	47

V.    ACTIONS REQUIRED OF REGISTRANTS	49
      A.    Manufacturing-Use Products		49
            1.    Additional Generic Data Requirements	49
            2.    Labeling Requirements for Manufacturing-Use Products	 50
      B.    End-Use Products	50
            1.    Formulation Changes   	50
            2.    Stakeholder Meetings	  	50
            3.    Additional Product-Specific Data Requirements	51
            4.    Timeframes	51
            5.    Labeling Requirements for End-Use Products	51
      C.    Required Labeling Changes Summary Table	53
      D.    Existing Stocks	 .	 59

VI.   APPENDICES  			61

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APPENDIX  A.    Table of Use Patterns Subject to Reregistration	62
APPENDIX  B.    Table of the Generic Data Requirements and Studies Used to
                '  Make the Reregistration Decision . . .  . .	  117
APPENDIX  C*    Citations Considered to be Part of the  Data Base Supporting
                  the Reregistration of Zinc phosphide   . . .	-••'.•••'  129
APPENDIX  D.    Combined Generic and Product Specific Data Call-In   .  143
      Attachment  1.     Chemical Status Sheets .  . .	  165
      Attachment  2     Combined Generic and Product Specific Data Call-In
                        Response Forms -(Form A inserts) Plus Instructions
                        . . . .....„.:...........	; . .  .  167
      Attachment  3     Generic and Product Specific Requirement  Status and
                        Registrant's Response Forms (Form B inserts) and
                        Instructions .. ..,.....«.....,	  170
      Attachment  4     EPA Batching of End-Use Products for Meeting Data
                        Requirements for Reregistration .	  193
APPENDIX  E.    List of Available Related Documents ..............  198
      Attachment  1.     List of All Registrants Sent This Data Call-In (insert)
                        Notice  •....'.'..-......... ... . .  . . ...  ..... 200
      Attachment  2.     Cost Share, Data Compensation Forms, Confidential
                        Statement of Formula Form and Instructions ... 201

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 ZINC PHOSPHIDE REREGISTRATION ELIGIBILITY DECISION TEAM

 Office of Pesticide Programs:

 Biological and Economic Analysis Assessment               .
 William Gross
 Frank Hernandez
Herbicide and Insecticide Branch
Economic Analysis Branch
Environmental Fate and Effects Risk Assessment
William Erickson
James Goodyear
Gail Maske

Health Effects Risk Assessment

John Redden
John Leahy                  .
Stanley Gross
David Hrdy     ,

Registration Support Risk Assessment

Daniel Peacock
William Jacobs

Risk Management

Susan Jennings            ,
Dana Lateulere
Environmental Risk Branch III
Ecological Hazard Branch
Environmental Risk Branch I
Risk Characterization and Analysis Branch
Chemistry and Exposure Branch I
Toxicology Branch II
Chemistry and Exposure Branch II
Insecticide-Rodenticide Branch
Insecticide-Rodenticide Branch
Reregistration Branch III
Reregistration Branch III

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11

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 ADI
 AE
 a.i.
 ARC
 CAS
 CI
 CNS
 CSF
 DFR
 DRES
 DWEL
 EEC

 EP
 EPA
 FAO/WHO
 FDA
 FIFRA
 FFDCA
 FQPA
 FOB
 GLC
 GM
 GRAS
 HA

 HOT
 LC,
   •50
LD
   50
LD|0
LEL
LOG
LOD
LOEL
MATC
MCLG
mg/L
MOE
MP
MPI
MRID
N/A
GLOSSARY OF TERMS AND ABBREVIATIONS

   Acceptable Daily Intake. A now defunct term for reference dose (RfD).
   Acid Equivalent
   Active Ingredient                   '
   Anticipated Residue Contribution
   Chemical Abstracts Service
   Cation                                                    •
   Central Nervous System                          ,
   Confidential Statement of Formula             .             '                    -
   Dislodgeable Foliar Residue
   Dietary Risk Evaluation System'
 :  Drinking Water Equivalent Level (DWEL) The DWEL represents a medium specific (i.e.
   drinking water) lifetime exposure at which adverse, non carcinogenic health effects are not
   anticipated to occur.
   Estimated Environmental Concentration.  The estimated pesticide concentration in an environment,
   such as a terrestrial ecosystem;
   End-Use Product
   U.S. Environmental Protection Agency
   Food and Agriculture Organization/World Health Organization
   Food and Drug Administration
   Federal Insecticide, Fungicide, and Rodenticide Act
  Federal Food, Drug, and Cosmetic Act .
  Food Quality Protection Act
  Functional Observation Battery           .                                '
  Gas Liquid Chromatogr'aphy                   ,
  Geometric Mean                    ;-."••'
  Generally Recognized as Safe as  Designated by FDA
  Health Advisory (HA).  The HA values are used as informal guidance to municipalities and other
  organizations when emergency spills or contamination situations occur.
  Highest Dose Tested
  Median Lethal Concentration.  A statistically derived concentration of a substance that can be
  expected to cause death in 50% of test animals.; It is usually expressed as the weight of substance
  per weight or volume of water, air or feed,  e.g., mg/1, mg/kg or ppm.
  Median Lethal Dose.  A statistically derived single dose that can be expected to cause death in 50%
  of the test animals when administered by the route indicated (oral, dermal, inhalation).  It is
  expressed as a weight of substance per unit weight of animal, e.g.,  mg/kg.
  Lethal Dose-low. Lowest Dose at which lethality occurs.
  Lowest Effect Level            .                                         •
  Level of Concern               '.'•';
  Limit of Detection              ,                                       -
  Lowest Observed Effect Level
  Maximum Acceptable Toxicant Concentration
 Maximum Contaminant Level Gpal  (MCLG) The MCLG is used by the Agency to regulate
 contaminants in drinking water under the Safe Drinking Water Act. -
 Micrograms Per Gram          •     '    -
 Micrograms per liter
 Milligrams Per Liter      '.                  •     .'.••>•
 Margin of Exposure                ,
 Manufacturing-Use, Product
 Maximum Permissible Intake .
 Master Record Identification (number).  EPA's system of recording and tracking studies submitted.
 Not Applicable:
                                                  111

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              GLOSSARY OF TERMS AND ABBREVIATIONS
 NOEC
 NPDES
 NOEL
 NOAEL
 OP
 OPP
 Pa
 PADI
 PAG
 PAM
 PHED
 PHI
 ppb
 PPE
 ppra
 PRN
 Q*.
 RBC
 RED
 REI
 RfD
 RS
 RUP
 SLN
 TC
 TD
 TEP
 TGAI
 TLC
 TMRC
 torr
 WP
WPS
 No Observable Effect Concentration
 National Pollutant Discharge Elimination System
 No Observed Effect Level
 No Observed Adverse Effect Level
 Organophosphate
 Office of Pesticide Programs
 pascal, the pressure exerted by a force of one newton acting on an area of one square meter.
 Provisional Acceptable Daily Intake
 Pesticide Assessment Guideline
 Pesticide Analytical Method
 Pesticide Handler's Exposure Data
 Preharvest Interval
 Parts Per Billion
 Personal Protective Equipment
 Parts Per Million
 Pesticide Registration Notice
 The Carcinogenic Potential of a Compound, Quantified by the EPA's Cancer Risk Model
 Red Blood Cell
 Reregistration Eligibility Decision
 Restricted Entry Interval
 Reference Dose
 Registration Standard
 Restricted Use Pesticide
 Special Local Need  (Registrations Under Section 24 ® of FIFRA)
 Toxic Concentration, The concentration  at which a substance produces a toxic effect.
 Toxic Dose. The dose at which a substance produces a toxic effect.
 Typical End-Use Product
 Technical Grade Active Ingredient
 Thin Layer Chromatography
Theoretical Maximum Residue Contribution
A unit of pressure needed to support a column of mercury 1 mm high under standard conditions.
Wettable Powder
Worker Protection Standard
                                                IV

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 ABSTRACT

        The U. S. Environmental Protection Agency has completed,its ^registration eligibility
 decision of the pesticide zinc phosphide.  This decision includes a comprehensive" reassessment
 of the required target data'and the use patterns of currently registered products.  Zinc
 phosphide is a fodenticide that reacts with the acidic conditions in the gut to form phosphine
 gas, which interferes with cell respiration.  Zinc phosphide is formulated as a bait/solid, dust,
 granular, pellet/tablet or wettable powder.  The rodenticide may be used to control many
 species of rodents, including mice, ground squirrels, prairie dogs, voles, moles, rats,
 muskrats,  nutria and gophers.  Zinc phosphide may be used as an indoor or outdoor spot
 treatment for rodents as well as around burrows or underground in orchards, vineyards,
 various food crops, rangelands, and non-crop areas. Zinc phosphide is also applied as a
 broadcast treatment by  ground or aerial applications.

       The Agency has concluded that zinc phosphide,  labeled and used as specified in this
 Reregistration Eligibility Decision document, will not cause unreasonable risks to humans or
 the environment and that all uses are eligible for reregistration. To support broadcast
 applications, the Agency is requiring additional aquatic toxicity data and further use
 information. The eligible Uses include: indoor and outdoor residential and agricultural areas
 (including in and around homes, lawns, bulbs, in and around outside buildings/barns, rights-
 of-ways/fencerows/hedgerows), indoor and outdoor commercial or institutional premises and
 equipment, golf courses, and reforestation areas. The Agency has determined that certain
 application methods, in conjunction with certain use restrictions, do not result in residues of
 zinc phosphide on food crops.  Therefore, these uses are not considered food uses for the
 purpose  of tolerance or dietary risk assessment. These  "non-food" crop uses are eligible for
 reregistration, provided they employ the application methods and other restrictions specified in
 this document. These crops include:  alfalfa, barley, berries, oats, wheat,  no-till corn,
 macadamia nut orchards, orchards/groves (post-harvest and dorma'nt), sugar maple, and
 timothy (hay).  In addition, the following crop uses that are considered food uses of zinc
 phosphide  are eligible for reregistration: grapes, rangeland grasses and sugarcane.  Artichokes
 and sugar beets have regional tolerances established for use in California; currently  there are
 no labels that include the use on artichokes.                     .

       Although zinc phosphide is primarily used in agricultural and non-residential settings,
 rodenticides that  are used in and around the home are responsible for a high number of
 accidental exposures each year.  EPA is concerned about the continued risk of exposure to
 humans, especially children, from rodenticides used in residential settings as well as the cost
 and trauma associated with treating those who might have been accidentally exposed.
 Although there are not many incidents  associated with zinc phosphide perse, the Agency
believes that the common use pattern should be the primary determining factor shaping the
regulatory  decision regarding these rodentieides used in and around the home. Additionally, a
margin of exposure (MOE)  of 0.5 was calculated for zinc phosphide based on an acute
neurotoxicity study and accidental ingestion. of the bait formulation by a child. Generally, the
                                            v

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Agency seeks to ensure 'that exposures have an MOE of 100 or greater.  The Agency has also
determined that a single swallow of zinc phosphide bait may be fatal to a young child.

       To mitigate the potential risk to children from accidental ingestion of baits, the Agency
is requiring several mitigation measures to be implemented in two phases. During Phase I the
Agency will require zinc phosphide products, as well as those of several other rodenticides, to
incorporate indicator dye (to help identify whether a child or pet has actually consumed the
pesticide) and bittering agents into their formulations.  These formulation changes are required
of all zinc phosphide products, except for those used exclusively in an agricultural setting. In
addition, registrants must update their product labels to include the protective statements
addressed in Section V of this document.  During Phase II EPA will form a stakeholder  group
(including industry, states, various poison control centers, rodent control experts, the medical
community and other interested parties) to develop additional means of significantly reducing
exposures to children and pets.  It is the Agency's intent that, within nine months or less from
the issuance of the RED, the stakeholder group will conclude with recommendations on  how to
mitigate risk to children and pets.  Possible outcomes of this group include:  requiring all
rodenticide baits used hi residential settings to be placed in disposable, child-resistant bait
stations or equivalently  protective mechanisms; develop an exhaustive educational and outreach
program for consumers and enhanced training for certified applicators; tamper-resistant bait
stations; and additional  labeling improvements. To monitor the progress of the measures
prescribed during both phases, the Agency is also requiring registrants to submit annual
American Association of Poison Control Center Data for years 1999 through 2009.
Registrants are encouraged to  share the cost of generating data and new technologies,
whenever appropriate.

       In establishing or reassessing tolerances, the Food Quality Protection Act (FQPA)
requires the Agency to consider aggregate exposures to pesticide residues, including all
anticipated dietary exposures and other exposures for which there is reliable information, as
well as the potential for cumulative effects from a pesticide and other compounds with a
common mode of toxicity. The Act further directs the Agency to consider the potential for
increased susceptibility  of infants and children to the toxic effects of pesticide residue.
          /                                    '
       Zinc phosphide, aluminum phosphide and magnesium phosphide all generate phosphine
gas. The Agency believes the generation of phosphine should be considered as part of its
aggregate assessment.  Other chemicals may share a common mode of toxicity with phosphine
gas. In general, after EPA develops a methodology for applying common mechanism of
toxicity issues to risk assessments, the Agency will develop a process (either as part of the
periodic review of pesticides or otherwise) to reexamine those tolerance decisions made
earlier. However, with respect to zinc phosphide tolerance reassessment, any future
cumulative risk determination regarding other chemicals that have a common mode of toxicity
with phosphine will not include the uses of zinc phosphide discussed hi this document because
the exposures to phosphine from zinc phosphide are so unlikely.
                                            VI

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       The Agency has determined that acute or chronic dietary exposure associated with the
use of zinc phosphide is .unlikely.  Of those commodities designated as food uses for zinc
phosphide, only three were found to have detectable residues after application (grasses, sugar
beets,  sugarcane). Since these three crops are not direct human.food items, no acute or
chronic dietary consumption of zinc phosphide is expected.  Also, zinc phosphide will not
concentrate during the processing of any commodity because the act of processing will not
allow for unreacted zinc phosphide to remain in or on processed food items. No drinking
water risk assessment was performed for zinc phosphide because no residues are expected in
either ground or surface water.  Exposure, other than accidental ingestion,  is not expected.
EPA does not believe "accidental ingestion" of baits should be considered in the FQPA
determination for tolerance setting.  Notwithstanding the absence  of exposure, the Agency   -•
established an RfD for zinc phosphide.  FQPA provides that EPA apply an additional tenfold
margin of safety for infants and  children to account for pre- and post-natal toxicity and the
completeness of the toxicity and exposure database, unless EPA determines that a different
margin of safety will be safe for infants and children.

       The available data base for zinc phosphide does not indicate a potential for an increased
sensitivity to infants or children, however, it does not include a developmental study in rabbits
or a two-generation reproductive study in rats. The available data provided no indication of
increased sensitivity of fetal rats to in utero exposure to zinc phosphide.  The prenatal
exposure developmental toxicity study in rats demonstrated no developmental effects at the
highest dose  tested, which was maternally toxic.   The Agency is not requiring additional
developmental or reproduction studies at this time because exposure from food sources is
expected to be minimal to non-existent,  however, the Agency has established an RfD of
0.0001 mg/kg based on a subchronic oral study that showed no effects at 0.1 mg/kg. The
Agency found, in its evaluation of dietary risk for zinc phosphide subsequent to the RfD
determination, that no  dietary  or drinking water exposure is expected and no risk assessment is
necessary.  Should a risk assessment be required in  the future, due to treated food crops, an
additional uncertainty factor of 10 would be applied to the Reference Dose  calculation.  This
uncertainty factor would account for the extrapolation from subchronic to chronic exposure,
the lack of reproductive toxicity data, and the lack of chronic toxicity data in a non-rodent
species.  The RfD of 0.0001 mg/kg reflects this additional uncertainty factor. If food uses
showing  dietary exposure are proposed for registration,  a risk assessment will have to be
performed.  If risks are unacceptable using the current RfD, which reflects  an additional
uncertainty factor of 10, further  studies  will be required.
     '  '                •             '        •                           "
       To mitigate the potential  exposure to handlers of paniculate dusts from baits, tracking
powders  and wettable powders the Agency is requiring, among  other changes, the use of
dust/mist filter respirators and protective gloves.

       To mitigate the potential  exposure of the rodenticide to non-target animals  in an
agricultural setting, the Agency is  retaining the requirement that all zinc phosphide products
labeled for field use  (except those limited to underground baiting for pocket gophers and
                                           vn

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 moles) must be restricted to use by pesticide certified applicators, or persons under their direct
 supervision.

        Because the use of zinc phosphide will still present a hazard to non-target animals, the
 Agency is seeking ways to minimize exposure to these animals.  The Agency is especially
 concerned about the broadcast use of zinc phosphide as it allows large tracts of land to be
 treated. However, the available data do not show that hand-baiting will necessarily  result in
 reduced exposure to non-target animals. Rather than impose specific use restrictions at this
 time, the  Agency will continue its evaluation of the risks associated with hand baiting versus
 broadcast applications and may impose additional data requirements or label amendments at a
 later date.                                                     _

        Although the use of zinc phosphide does present a risk to non-target wildlife, the
 Agency has determined that these  adverse effects are not unreasonable due to the benefits of
 zinc phosphide.  The use of the broadcast application allows the treatment of vast tracts of land
 where hand baiting is not feasible.  In addition, the Agency believes that limiting the broadcast
 uses may  indirectly encourage the use  of other pesticides that are more hazardous to non-target
 animals than zinc phosphide.

       Before reregistering the products containing zinc phosphide, the Agency is requiring
that product specific data, revised  Confidential Statements of Formula (CSF) and revised
labeling be submitted within eight months of the issuance of this document.  These data include
product chemistry for each registration and acute toxicity testing.  After reviewing these data
and any revised labels and finding them acceptable in accordance with Section 3(c)(5) of
FIFRA, the Agency will reregister a product.  Those products which contain other active
ingredients will be eligible for reregistration only when the other active ingredients are
determined to be eligible for reregistration.
                                           Vlll

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  I.
INTRODUCTION
        In 1988, the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) was
  amended to accelerate the reregistration of, products with active ingredients registered prior to
  November 1,  1984. The amended Act provides a schedule for the reregistration process to be
  completed in nine years. There are five phases to the reregistration process. The first four
  phases of the process focus on identification of data requirements to support the reregistration
  of an active ingredient and the generation and submission of data to fulfill the requirements.
  The fifth phase is a review by the U.S. Environmental Protection Agency (referred to as "the
  Agency") of all data submitted to support reregistration.

        FIFRA Section 4(g)(2)(A) states that in Phase 5 "the Administrator shall determine
 whether pesticides containing such active ingredient are eligible for reregistration" before
 calling in data on products and either reregistering products or taking "other appropriate
 regulatory action."  Thus, reregistration involves a thorough  review of the scientific data base
 underlying a pesticide's registration.  The purpose of the Agency's review is to reassess the
 potential hazards arising from the currently registered uses of the pesticide, to determine  the
 need for  additional data on health and environmental effects,  and to determine whether the
 pesticide meets the "no unreasonable adverse effects" criterion of FjPRA.

        On August 3, 1996, the Food Quality Protection Act of 1996 (FQPA) (Public Law
 104-                                          .-..-•.,'--
 170) was signed into law.  FQPA amends both the Federal Food, Drug, and Cosmetic Act
 (FFDCA), 21 U.S.C. 301  et seq., and the FederalTnsecticide, Fungicide, and Rodenticide Act
 (FIFRA), 7 U.S.C.  136 et seq.  The FQPA amendments went into effect immediately.  As a
 result, EPA is  embarking on an intensive process, including consultation with registrants,
 States, and other interested stakeholders, to make decisions on the new policies and procedures
 that will be appropriate as a result of enactment of FQPA.  This process will include a more in
 depth analysis of the new safety standard and how it should be applied to both food and non-
 food pesticide applications.  The FQPA did not, however, amend any of the existing
 reregistration deadlines in section 4 of FIFRA. Therefore,  the Agency will continue its
 ongoing reregistration program while it continues to determine how best to implement FQPA.

       This document presents the Agency's decision regarding the reregistration eligibility of
 the registered uses of zinc phosphide, including the risk to infants and children for any
 potential dietary,  drinking water, dermal of oral exposures, and cumulative effects as
 stipulated under the FQPA.  The document consists of six sections.  Section I is the
 introduction.  Section II describes zinc phosphide,  its uses, data requirements and regulatory
history. Section III discusses the human health and environmental assessment based on the  •
 data available to the  Agency.   Section IV presents the reregistration decision for zinc,
phosphide. Section V discusses the reregistration requirements for zinc phosphide.  Finally,
Section VI is the Appendices  which support this Reregistration Eligibility Decision.
Additional details concerning the Agency's review of applicable data are available on request.
                                            1

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II.     CASK OVERVIEW

       A.    Chemical Overview             ,
                        \          '          . " .'                -
             The following active ingredient is covered by this Reregistration Eligibility
       Decision:                                                               -
                    Common Name:

                    Chemical Name:

                    Chemical Family:

                    CAS Registry Number:

                    OPP Chemical Code:
                                 Zinc Phosphide

                                 Zinc Phosphide

                                 Inorganic compound

                                 1314-84-7

                                 088601
                                              Zn3P2
•      Empirical Formula:

•      Trade and Other Names:   n/a
      B.
•      Basic Manufacturers:      Bell Laboratories, Inc.. and HACCO Inc.

Use Profile
             The following is information on the currently registered uses with an overview
      of use sites and application methods.  A detailed table of the uses of zinc phosphide that
      were considered for reregistration is in Appendix A.
             For zinc phosphide:

             Type of Pesticide:
                          Rodenticide
            Use Sites:
            Nonfood: Indoor and outdoor residential and agricultural areas (including in and
            around homes, on lawns, around bulbs, in and around outside buildings/barns,
            rights-of-ways/fencerows/hedgerows),  indoor and outdoor commercial or
            institutional premises and equipment (including food handling establishments),
            golf courses, reforestation areas, alfalfa, barley, berries (dormant), oats, sugar
            maple, wheat, no-till corn, macadamia nut orchards, orchards/groves (post-
            harvest and dormant), timothy (hay). Zinc phosphide can also be used as a
            general,  wide area, Public Health Use pesticide.

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        Food: grapes, rangeland grasses, and sugarcane. Artichokes and sugar beets
        have  regional registrations in California; currently there are no labels that
        include use on artichokes.

        Target  Pests: black-tail jack rabbit, black-tail prairie dog, chipmunk,
        Columbian ground squirrel, cotton rat, field mice, ground squirrels, Guanosine's
        prairie dog, house mouse, jack rabbits, marmot, meadow mouse, meadow vole,
        mice, microtus, muskrats, Norway rat, nutria, pine (woodland) vole, pine vole,
        pocket gophers, pocket gophers (plains), prairie dogs, red squirrel, Richardson
        ground squirrel, roof rat, southern pocket gopher, squirrels, white-tailed prairie
        dog, wood rats, yellow-faced pocket gopher.

        Formulation Types Registered: bait/solid (1 - 2%), dust (10 - 63%), granular
        (2 - 63%), pellet/tablet (2%), wettable powder (80%  as pre-mix for bait)

        Method and Rates of Application:
               Equipment -
              Method and Rate -
              Timing -
aircraft, bait box, duster, hand bulb duster, hand
probe, hand at bait stations, hand probe, hand
treatments, mechanical burrow builder, mechanical
granule applicator, or mechanical broadcast.

rates of application vary by pest with the highest of
0.2 Ib/A on a wide variety of crops.

zinc phosphide is typically applied when
infestation is noticed.
       Use Practice Limitations: All labels include hazard statements for humans and
       domestic animals requiring that the product be kept away from humans,
       domestic animals, and pets.  The use in some crop areas must be when the crop
       or orchard is dormant.

C.     Estimated Usage of Pesticide

       This section summarizes the best estimates available for the pesticide uses of
zinc phosphide.  These estimates are derived from a variety of published and
proprietary sources available to the Agency. The data, reported on an aggregate and
site (crop)  basis, reflect annual fluctuations in use patterns as well as the variability in
using data  from various information sources.

       Zinc phosphide is a rodenticide used almost exclusively by the agricultural
industry. Very little zinc phosphide is used residentially.  About half of the total

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 volume is used in' or around farm structures, and the other half is applied to various
 agricultural, sites. There is limited information available on the market share and usage
 of rodenticides.  The following table estimates zinc phosphide usage by site:
Zinc Phosphide Use by Site
Site
Sugar beets
Wheat; Barley and Oats
Rangeland
Landscape (turf, golf courses)
Farm Structures (barns, sheds, etc.)
Residential . '
Other (less than 5 % per site of all others)
Pounds Applied
(% of total)
10
10
10
10
40
5
15
Acres Treated
(% of site acres)
' < 1
< 1
< 1
N/A
N/A
N/A
' N/A
D.    Data Requirements and Regulatory History
                                               'i         •   •     .         •  '
       Zinc phosphide was first registered in the United States in 1947 by the United
States Department of Agriculture  (USDA) for use as  a rodenticide.  A Registration
Standard was issued for zinc phosphide in June 1982. The Standard evaluated the
available data with other relevant  information on zinc phosphide and required the
submission of additional data to maintain the existing registrations.  A DCI was issued
in 1987 and another in 1991 requiring further data for reregistration. This
Reregistration Eligibility Decision reflects a reassessment of all data which were
submitted in response to the Registration Standard and the two DCIs.        ,

       Following the issuance of the 1991 DCI, the Zinc Phosphide Consortium was
formed.  The consortium is made  up of technical, formulator, as well as end-use
product registrants.  The USDA APHIS  (Animal and Plant Health Inspection Service)
is the consortium leader.

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HI.    SCIENCE ASSESSMENT
       A.    Physical Chemistry Assessment

       IDENTIFICATION OF ACTIVE INGREDIENT
       Zinc phosphide:
                                          Zn
                                         •Zn
                                          Zn
                                 Empirical Formula:
                                 Molecular Weight:
                                 CAS Registry No.:
                                 OPP Chemical No.:
Zn3P2
258.09
1314-84-7
088601
             Technical zinc phosphide is a gray to black powder with a phosphine odor and
      melting point of 420 C.  Zinc phosphide is insoluble in water and ethanol, and soluble
      in benzene and carbon disulfide.  Zinc phosphide is stable in dry conditions, but reacts
      slowly with water (including atmospheric moisture) to form phosphine gas (PH3). In
      the presence of acids or strong bases, phosphine gas is generated rapidly and may be
      spontaneously flammable or explosive. Technical zinc phosphide is classified as a
      flammable solid.by the U.S.  Department of Transportation.

      Manufacturing-use Products

          •  There are three registered zinc phosphide manufacturing-use products (MPs). A
      list of the MPs subject to this reregistration eligibility decision is presented in the
      following table:
MPs subject to this reregistration eligibility decision
% AI
93%
80%
80%
EPA Reg. No.
61282-3
61282-13
12455-24
Registrant
HACCO, Inc.
HACCO, Inc.
Bell Laboratories, Inq.

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        Additional generic and product-specific data are required for all three of the
 above products.  In addition to submitting the required data, the registrants must certify
,_that the suppliers of beginning materials and the manufacturing processes for the zinc
 phosphide products have not changed since the last comprehensive product chemistry
 review. , Alternatively, the registrants may elect to submit complete updated product
 chemistry, data packages for their products. The Agency considers these data to be
 confirmatory and does not expect them to alter the risk eligibility decision for zinc
 phosphide.                                 '                       •              '

 B.     Human Health Assessment

        1.      Toxicology Assessment
   •'" v '         1           "           =                 .-       "   '
        The toxicological data base on zinc phosphide is adequate and will support
 reregistration eligibility.  No further data are required at this time.

               a.      Acute Toxicity

        The acute  toxicity testing for zinc phosphide is summarized in the following
table and satisfy the requirements for acute toxicology data for zinc phosphide.
Acute Mammalian Toxicity
Test
Oral LD50 - rat
Dermal LD50 - rabbit
Inhalation LC50
Eye irritation - rabbit"
Dermal irritation - rabbit"
Skin sensitization "
Acute Neurotoxicity
% AI
89%
94%

.94%
94%

97%
MRID
00085366
00006030

00029247
00006029

43284301
Results
21 (13-3.5) mg/kg
2000 - 5000 mg/kg
waived .
Slight conjunctiva! redness, chemosis and
discharge
non irritating
waived •
NOEL = 5, LEL = 10 mg/kg (myelin
debris and vacuoles in peripheral nerves
of 2 female rats)
Category
I
III
r
rv ;
N/A
—
N/A
       In lieu of performing study, compound was designated as Toxicity Category I.
       Data pertaining to eye irritation, dermal irritation and defmal sensitization are not required to
       support the TGAI.  These data are presented for informational purposes.

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              b.     Subchronic Toxicity

        In a 90-day rat study zinc phosphide technical (97 % AI) was administered by
 oral gavage to rats (10/sex/dose) at doses of 0, 0.1, 1.0, or 3.0 mg/kg/day for 91 days.
 Mortality (5 females and 1 male) and moribundity (1 male) were reported in the high-
 dose group.  One mid-dose male was sacrificed moribund on Day 54.  Clinical  signs of
 excessive salivation and "cool to the touch" were observed at 1.0 mg/kg/day and
 above. Hydronephrosis and pyelonephritis were detected by microscopic
 histopathology in male kidneys at 3.0 mg/kg/day, and hydronephrosis was also
 observed at 1.0  mg/kg/day. Neither lesion was observed at 0.1 rng/kg/day. This study
 established a NOEL and LEL of 0.1 mg/kg/ day and 1.0 mg/kg/day, respectively,
 based on increased mortality and on kidney hydronephrosis in male rats.

        A 90-day neurotoxicity study was also submitted and will be discussed later in
 this document.  All other subchronic toxicity studies were waived in the 1982
 Registration Standard.  (MRID 43436601)

              c.     Chronic Toxicity and Carcinogenicity

       Although zinc phosphide is registered for use on food crops, no chronic  toxicity
 or carcinogenicity  studies are required because chronic exposure to zinc phosphide or
 its byproducts is expected to be negligible.

              d.     Developmental Toxicity

       In a developmental toxicity study mated female rats (25/group) were
 administered zinc phosphide in single daily doses by gavage at levels of 0, 1, 2 or 4
 mg/kg on days 6 through 15 of gestation. Nine maternal animals from the 4.0 mg/kg
 group were found dead between days 10 and 16 of gestation. The cause of death was
 not apparent from a gross examination.  Mean body weight and food intake reductions
 in the 4.0 mg/kg group females were significantly lower for gestation days 6-10 but not
 altered by the end of the treatment period.  The maternal NOEL was 2.0 mg/kg and the
 LEL was 4.0 mg/kg.based on mortality. The developmental NOEL was at or above
 4.0 mg/kg, which was the highest dose test.  No further data are required at this time.
 (MRID 43083501)

       Although the database did not include a developmental study on a non-rodent
species, as residues are expected to be negligible the requirement is waived.  If new
uses result in detectable residues, then this requirement will be reinstated.

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              e.     Reproductive Toxicity

       Although the database did not include a two-generation reproductive toxicity
 study in rats, as residues are expected to be negligible the requirement is waived.  If
 new uses result in detectable residues, then this requirement will be reinstated.

              f.     Mutagenicity

       AMES SALMONELLA. Salmonella TA-strains of bacteria were exposed to
 zinc phosphide (97% AI) suspended in DMSO, at doses of up to 5000 /^g/plate, with
 and without metabolic activation (S9). No increased revertants were induced.  Zinc
 phosphide was negative for gene"mutation in the Ames test. (MRID 42987301)

       MOUSE LYMPHOMA. Mouse lymphoma cells were exposed to zinc
 phosphide (97% AI) with and without mammalian metabolic activation (S9).  Increased
 mutants at the thymidine kinase locus (TK) were induced in a dose-dependent rn'anner
 at doses of 10 through 80 /ug/ml (+/- S9).  Zinc phosphide was positive for gene
 mutation in this mouse lymphoma assay. (MRID 42987302)

       CHROMOSOME ABERRATIONS.  Mice were treated with zinc phosphide
 (97% AI). suspended in corn oil up to severely toxic levels (150 mg/kg).  No increased
 aberrations (micronuclei) were induced.  Zinc phosphide was negative for mutagenicity
 in this micronucleus test. (MRID 42987303)

       These studies satisfy the requirements for mutagenicity testing.

              g.     Metabolism

       Since residues are expected to be minimal or nonexistent, the requirement for a
metabolism study with zinc phosphide has been waived.  If new uses result  in
detectable residues,  then this requirement will be reinstated.
             h.     Neurotoxicity
       Acute
       In an acute range-finding study, rats zinc phosphide was administered by gavage
to rats at dose levels of 1, 2, 3, 4, 8 and iO mg/kg/day.  There were no changes in
toxicity, body weight or food consumption initially and 7 days after, nor were there
any neurotoxicity effects. Although this study is not guideline, it does establish an '
LOEL of greater than 10 mg/kg.  (MRID 4328301) .

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        Subchronic

        In a 13-week subchronic neurotoxicity study, rats (11/sex/group) were dosed by
 gavage with zinc phosphide (97% AI) daily via oral gavage at levels of 0, 0.1, 0.5, or
 2 mg/kg.  A positive control group was included using trimethyltin chloride in water
 administered by gavage at 4.5 mg/kg (1 I/sex), one dose weekly for three weeks
 starting at week 8 of the dosing period. Although no dose range finding study was
 referenced in the report to establish the high dose set at 2 mg/kg/day, the Agency
 agrees with the high-dose setting based on a 90-day study that had been previously
 submitted.

        Each rat was observed twice daily for mortality and overt signs of toxicity.
 Routine functional observational batteries and motor activity assessments were carried
 out one week before dosing and during experimental weeks 4, 8 and 13.  Following the
 in-life neurotoxicity evaluation, six rats per sex from each test group (except for the
 positive control group males) were randomly selected for necropsy and neuropathology
 evaluation.  Eight of the positive control females euthanized in extremis and the one
 surviving male were necropsied and prepared for neuropathology analysis.

       One male and one female from the low-dose groups and one male from the high
 dose group died of causes unrelated to the zinc phosphide administration.  There were
 no adverse effects that could be ascribed to zinc phosphide.  All of the animals in  the
 positive control group were normal until dosing with trimethyltin chloride during week
 8.  They exhibited signs of overt toxicity beginning in week 9, becoming irritable,
 emaciated and unkempt in appearance. Three of the positive control males were found
 dead in their cages and the other 8 males were sacrificed in extremis  by week 11.  All
 of the positive control  females survived longer but had to be euthanized in extremis by
 week 12.

       Neuropathological examinations on some  of the peripheral  nerve sections in all
 treatment groups were incomplete because of inadequate tissue fixation.  None of the
 neuropathological  examinations that were performed on the zinc phosphide treated
 animal tissues showed  any lesions that could be related to the treatment.  The cerebral
 cortex of the positive control animals  showed hemorrhage of the choroid plexus,
necrosis of the hippocampus and dilation of the lateral ventricles.  The findings in  the
other sections of the trimethyltin chloride treated animals were either within normal
limits, not diagnostic secondary to inadequate fixation or revealed  artifacts of
preparation (vacuoles and myelin debris).  This study is not acceptable due to
inadequate neuropathological analyses, however, it is sufficient to  show systemic,
behavioral and neuropathological NOELs of 2 mg/kg/day,  the highest dose tested.

       A second 13-week subchronic  neurotoxicity study in rats (MRID #43903802)
was a partial repeat of the first study that was necessary due to inadequate fixation of
                                    10

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  nervous tissues during the neuropathology component in the initial study. In this study,
  rats (1 I/sex/group) were dosed daily with zinc phosphide (95% AI) via oral gavage (2 '
  ml/kg) at levels of 0, 0.1, 0.5, or 2 rag/kg!  A positive control group (initial study
  only) using trimethyltin chloride in water administered by gavage at 4.5 mg/kg
  (1 I/sex), one dose weekly for three weeks starting at week 8 of the dosing period.

         Each rat was observed twice daily for mortality and overt signs of toxicity.
  Routine observations, functional observational batteries and motor activity assessments
  were carried out one week before dosing and during weeks 4, 8 and 13  of the study.
  Eight days after the final set of neurobehavioral evaluations, 6 animals per. sex per
  group were randomly selected for neuropathology evaluation.  No postmortem
  examination was reported for the remaining animals.

        Four animals died of causes unrelated to the zinc phosphide administration.
  Clinical signs, body weights and food consumption in the treated animals were
  comparable to control animals.  Cause of the animals death was not reported, however,
 except for one mid-dose female all tissues were reported to be normal.      '

        Neurobehavioral observations were comparable to control animals, except for
 assessments of alterations of posture, rearing, touch, click and pinch observations
 which were statistically altered in the mid- or high-dose animals.  Neuropathological
 examination of the control and high-dose animals suggested no adverse changes in
 morphology. Although neither 13-week subchronic neurotoxicity study  is satisfactory,
 together the two studies provide sufficient information to fulfill the guideline
 requirements for a subchronic neurotoxicity study.  Due to the inconclusive findings in  '
 these studies, the overall NOEL for subchronic neurotoxicity was established at 0.1
 mg/kg/day, the lowest dose tested.  (MRIDs 43903801 and 43903802)

       2.     Toxicological  Endpoints for Risk Assessment
        • ,  ' '      .     •                  .      * •              ••     t - •     • -••
              a.      Acute Dietary

       No acute endpoints  were identified; therefore, an acute dietary risk assessment
 is not required.  An acute .endppint was identified for accidental poisqning. The NOEL
 is 5 mg/kg based on the occurrence of myelin debris and bubbles in peripheral nerves
 of two females in the high dose group of the acute neurotoxicity study and supporting
 information from the subchronic neurotoxicity test.

              b.     Short and Intermediate Term Occupational Endpoints

       No short- or intermediate-term dermal or inhalation endpoints were identified
for zinc phosphide; therefore  this risk assessment is  not required.
                                    11

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               c.      Chronic Occupational/Residential (Non-Cancer) Endpoints

        No chronic occupational endpoints were identified; therefore, this risk
 assessment is not required.

               d.      Reference Dose

        A chronic dietary reference dose (RfD) was established for zinc phosphide at
 O.OOOl mg/kg/day, based on the NOEL of 0.1 mg/kg/day in the subchronic oral
 toxicity study in rats.  The LEL in this  study is 1.0 mg/kg/day, based on increased
 mortality and kidney hydronephrosis. The RfD includes an uncertainty factor of 100 to
 account for the interspecies extrapolation and intraspecies variability.  The RfD also
 includes an additional uncertainty factor of 10 to account for the extrapolation from
 subchronic to chronic exposure, the lack of reproductive toxicity data, and the lack of
 chronic toxicity data in a non-rodent species.  This second uncertainty factor will also
 accommodate the  inability to assess the  potential for increased sensitivity of infants and
 children due to the lack of sufficient animal data on.in utero  and early postnatal
 exposure to zinc phosphide.
                                        $
        The Agency has determined that a chronic dietary risk assessment is not
 required because dietary residues are expected to be minimal. Zinc phosphide has not
 been reviewed by  the FAO/WHO Joint  Committee Meeting on Pesticide Residue
 (JMPR) and no acceptable daily intake (ADI) has been established by that Committee.

              e.     Carcinogenic Classification

       The requirement for carcinogenicity studies has been waived for zinc phosphide
 because chronic exposure is expected to be negligible.

       3.     Dietary Exposure, Risk  Assessment and Characterization

              a.     Dietary Exposure from Food Sources

 GLN 860.1200: Directions for Use

       The reregistration of zinc phosphide in the United States is being supported by
the Zinc Phosphide Consortium (ZPC).  For the purposes of reregistration, the ZPC
has provided the Agency with a summary of food and non-food uses it seeks to
support, and current labels and proposed label changes.   The  ZPC has indicated that
they will support the following crop uses:  artichokes, grapes, grasses (rangeland),
sugar beets, and sugarcane.  The ZPC also supports many crop uses that have been
designated as non-food. These designations are based on labeling requirements and
application methods.  For the purposes of reregistration,  the Agency has evaluated the
                                    12

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 available residue "chemistry database to support the use patterns classified as food uses.
 For the reregistration of end-use products, labeling must bear the corresponding
 restrictions, rates and methods as specified for the food and non-food designations.

 Determination of food versus non-food uses: According to OPPTS GLN 860.1000, the
 application of a rodenticide as a bait around the borders of cropland or in a
 tamper-resistant bait box within cropland is considered a non-food use while application
 of the bait directly to the crop is considered a food use. Specific examples of food vs.
 non-food use determinations have been summarized by the Agency in connection with
 registrations for the rodenticides sodium fluoroacetate and strychnine.

        EPA considers the following to be food uses: (I) any aerial applications where
 food or feed crops or livestock are present; (ii) broadcast and above-ground spot baiting
 on pastures or rangeland; (iii) broadcast applications to food or feed crops; (iv)
 applications in livestock areas; and (v) broadcast applications to ditch banks.
                                                                    i        - •
        EPA considers the following to be non-food uses:  (I) underground applications;
 (ii) applications to buffer zones (perimeters of a field) where grazing can be restricted;
 (iii) orchard uses where the bait is placed on the ground (with appropriate grazing
 restrictions); (iv) applications to bare ground around animal burrow entrances, dens,
 tunnels, and animal nests; (v) spot baiting applications to ditch banks; (vi)  applications
 on non-crop land and in non-agricultural areas ,where no livestock are present; and (vii)
 baitbox applications and applications in V-shaped above-ground troughs.

 Non-food uses of zinc phosphide: The Agency  has determined that the use of zinc
 phosphide at the following sites should be classified as non-food" use,  based on
 examination of the registered and proposed use patterns: alfalfa (including alfalfa
 grown for seed), barley, berry production areas, bulbs, corn (no-till), oats, orchards
 and groves (including macadamia nut and sugar maple orchards), timothy,  wheat, and
buildings  (Including outside buildings). The justifications for classifying uses on these
crops as non-food uses are presented in Table 4.  Although no residue chemistry data
are required for reregistration of the non-food uses, label amendments are required to
support the non-food  use classification of  uses on orchards and buildings.
                                     13

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Current Zinc Phosphide Non-Food Uses Sites (no tolerances required)
Site
Alfalfa (seed crop)
Alfalfa
Barley, Oats, Wheat
Berry Production
Areas
Bulbs
Com, no-till
Macadamia nut
orchards
Maple, sugar
Orchards/groves
Timothy
Buildings
Basis for Non-Food Designation
Applied only underground or in burrow builder.
Applied only underground, in bait stations, or in burrow builder
Applied only underground or in burrow builder. Dormant season use only.
Applied only underground, in bait stations, or in burrow builder. Applied in fair weather after
harvest while crop is in a nonbearing phase.
Can, not be applied in gardens or areas where food or feed may be contaminated.
For pre-plant or at-plant application only. May not be applied to areas inhabited by livestock.
Animals may not be grazed in treated areas.
Bait applied only by broadcast or in burrow builder. Animals can not be grazed in treated
areas and bait must be removed from trees prior to harvest. May not be broadcasted over
growing crop when bait may lodge in plant.
Application is made only in bait stations. Stations must be placed so that the bait will not come
in contact with the harvested commodity or tubing that harvests commodity.
Is only applied after harvest or any time during the dormant season. Can not be broadcasted
over growing crops or bare ground and animals may not be grazed in treated areas.
Is applied only during crop dormancy and not over growing crops. Animals may not be grazed
in treated areas.
The use directions must restrict the use in food/feed handling establishments as specified in
Section V.
Food uses of zinc phosphide:  The Agency has determined that application of zinc
phosphide on artichokes (globe), grapes, grasses grown in pastures and rangelands, sugar
beets and sugarcane should be classified as food uses based on established policy, as
outlined in OPPTS GLN 860.1000 and noted above. The Agency required crop field
trials for these food uses and detectable residues were found on grasses, sugar beets and
sugarcane.  No detectable residues were found on artichokes or grapes.  Tolerances were
established for all of these crops based on their designation as a food, crop, as is Agency
policy.  The tolerances were set on the actual detected residues or based on the limit of
detection.

      A label amendment is required to support the use of zinc phosphide on grasses.
Although zinc phosphide is not currently registered for use  on artichokes (globe), the
Zinc Phosphide Consortium has indicated that they wish to  reinstate this use and retain
the established regional tolerance for artichokes. The use of zinc phosphide on
artichokes (globe) may be reinstated provided the application method is restricted to  .
satisfy the requirements for. a non-food use site.
                                      14

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      Although several time-limited tolerances are in place to allow for emergency
 exemption (or section  18) applications of zinc phosphide on several crops, these crops
 were not included in the risk assessment as the corresponding residues are expected to be
 negligible.

 GLN 860.1300:  Nature of the Residue - Plants                    ;    ' .   .
           - ' """                                     '       /

      The reregistration requirements for additional plant metabolism data are waived
 based on a zinc phosphide radiotracer study which demonstrated that sugarcane will
 absorb and translocate [32P] phosphine, but not as phosphine per se.  The 32P was shown
 to be thermally stable and non-volatile, and was assumed to be translocated through
 plants as phosphate.- Based on this radiotracer study, the Agency has determined that the
 residue of concern is the unreacted zinc phosphide, measured as phosphine. The current
 tolerance expression for plants is appropriate and no changes are required.

 GLN 860.1300:  Nature of the Residue - Livestock •                         .

      The reregistration requirements for animal metabolism data are waived.  The
 Agency does not  expect secondary residues in meat,  milk, poultry, and eggs.  Residues,
 of zinc phosphide ingested  by livestock would be immediately converted to phosphine ',
 and metabolized to naturally occurring phosphorous compounds.

 GLN 860.1340:  Residue Analytical Methods
 i -  '  ^' ' '     m^—^   I .^^^^—.—   Bui      ,|i                                         ^

      The reregistration requirements for residue analytical methods are fulfilled.
 Acceptable methods are available for enforcement and  data collection purposes for plant
 commodities.  The Pesticide Analytical Manual/PAM) Vol. II lists, under aluminum
 phosphide, a colorimetric method and a GLC method with flame photometric detection
 as Methods A and B, respectively, for the enforcement of tolerances.  Both methods
 determine the  level of phosphine liberated when zinc phosphide is exposed to dilute acid
 solutions. Method A remains a lettered method because of variable recoveries observed
 in an Agency method try-out, however, the method has been determined to be acceptable
 for enforcement because phosphine gas is highly reactive and finite residues are not
 expected. Data submitted in support  of the established tolerances  were collected by one
 of these two methods.

 GLN 860.1360: Multiresidue Methods

     Because zinc phosphide is an inorganic compound, recovery of residues using FDA
Multiresidue Protocols is not expected and the requirement for such data is waived.
                                     15

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 GLN 860.1380:  Storage Stability Data

       The reregistration requirements for storage stability data are partially fulfilled.
 Adequate storage stability data have been submitted to support frozen storage of sugar
 beet and alfalfa samples for 6 months; these data may be translated to grass forage and
 sugarcane. Adequate storage stability data have also been submitted to support storage
 of artichokes for 16 months.

       To fully satisfy reregistration requirements, the registrant(s) must provide
 information concerning the length and conditions of sample storage for grapes, rangeland
 grass forage, and sugarcane; dates of harvest and analysis are also required for
 sugarcane. If samples were stored for longer than 30 days (grapes) or 6 months (grass
 forage and sugarcane) prior to analysis,  then additional crop field trial data will be
 required.

 GLN 860.1460:  Food-Handling

       The reregistration requirements  for magnitude of the residue in food-handling
 establishments will be considered fulfilled pending appropriate label revisions in order to
 reinforce the non-food use classification on/in buildings. The use directions on some
 tracking powder labels are not sufficiently restrictive to preclude the need for residue
 data on food-handling establishments.  Please see Section V (Actions Required of
 Registrants) for exact labeling language.

 GLN 860.1480:  Meat, Milk, Poultry, and Eggs

      The reregistration requirements for data on magnitude of the residue in animals are
 waived. There is no  reasonable expectation of residues  in meat, milk, poultry, or eggs
 [Category 3 of 40 CFR §180.6(a)].  Residues of zinc phosphide ingested by livestock
 would be immediately converted to phosphine and metabolized to naturally occurring
 phosphorus compounds.

 GLN 860.1500:  Crop Field Trials

      The reregistration requirements for magnitude of the residue in/on grapes, grasses,
 and sugarcane will be considered fulfilled pending resolution of storage stability issues.
 The available field trial data for these raw agricultural commodities (RACs) have been
 reevaluated for purposes of tolerance reassessment. Overall, acceptable field trials
reflecting the maximum registered use patterns and conditions under which the pesticide
 could be applied were conducted.  The geographic representation for each commodity is
generally adequate, and a  sufficient number of trials reflecting representative formulation
classes was conducted.  Refer to "Tolerance Reassessment Summary"  section for
recommendations with respect to established tolerance levels.
                                      16

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     , Adequate field trial data are available to support the reinstatement of zinc
 phosphide use on artichokes (globe) and sugar beets. If the registrant(s) wishes to retain
 the tolerances with regional registration established for sugar beet tops, and sugar beet
 root, then they must propose use directions reflecting the use patterns, for which adequate
 residue data from the original tolerance petitions are available.        .         '   '

 GLN 860.1850:  Confined Accumulation in Rotational Crops

      Data for confined accumulation in rotational crops has been waived because the
 physical properties of zinc phosphide precludes transfer of residues to rotated crops.

 GLN 860.1520:  Processed Food/Feed

      The reregistration requirements  for magnitude of the residue in sugarcane    *
.processed commodities are fulfilled. A processing study showed no concentration of
 residues in the processed fractions.  Tolerances for sugarcane processed fractions are not
 required.

      No processing data are needed for grapes, provided the field trial samples were
 analyzed within 30 days of sample collection.                  .

      The data requirements for a sugar beet processing study has been waived. The
 Agency believes that the refining process of sugar beets will remove any unreacted zinc
 phosphide from refined sugar.,

           b.    Dietary Exposure from Drinking Water

      Zinc phosphide degrades  rapidly to phosphine (PH3) and zinc ions (Zn2+), both of
 which sorb strongly to soil and are common nutrients in soil.1 Zinc phosphide and its
 degradation products appear to  have a low potential for ground and surface water
 contamination. Therefore, dietary exposure is not expected from either ground or
 surface water fed drinking water.
               ••                   •           .  •            ":             ','
           c.    Dietary Risk Assessment and Characterization

      The food crop uses which are being supported for reregistration are grapes, grasses
 (rangeland), sugarcane, globe artichokes, arid  sugar beet (roots and tops). These uses  *
 have all been designated as food uses, based on the application methods  and OEPTS
 policy GLN 180.1000, and have tolerances.
                :                '             '    ' -        -      •.•>..  |
      There were no detectable residues of zinc phosphide in grape and artichoke
 samples  following application of zinc phosphide as bait by hand application (globe
 artichokes) or to the ground by a spreader (grapes) .r
                                      17

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       Residue studies show there were quantifiable, residues in sugarcane, sugar beets,
 and grasses.  Since these crops are not direct human foods, no acute dietary consumption
 is expected.  Also, there is no likelihood of residues of zinc phosphide or phosphine
 being found through transfer of residues on grasses to meat and milk.  The Agency has
 determined that there is no likelihood of residues of zinc phosphide occurring in any
 processed commodities.

       4.    Occupational and Residential Exposure, Risk Assessment and
            Characterization

            a.   Occupational and Residential Exposure

      At this time, some products containing zinc phosphide are intended primarily for
 occupational use and some are intended primarily for homeowner use.

            (1)   Handler Exposures and Assumptions

      Based on the use patterns and potential exposures described above,  several   •
 exposure scenarios were identified for occupational and/or homeowner handlers of zinc
 phosphide: (1) mixing the dry concentrate into wet bait, (2) loading dry bait (granular/
 pellet) formulation to support aerial and ground equipment applications, (3) applying the
 wet and dry baits by hand (spoon) as spot treatments, (4) applying tracking powders by
 hand,  (5) applying tracking powders using hand-bulb and bellows-type dusters, (6)
 applying dry baits by hand as broadcast treatments, (7) applying dry baits with hand-held
 mechanical baiting device, (8) applying dry baits  with cyclone and end-gate seeders,
 tractor-drawn granular spreaders, and other ground-driven bait dispensing devices, (9)
 applying dry baits with fixed- or rotary-wing aircraft, (10) applying dry baits with
 whirly-bird spreaders, (11) applying dry baits with push-type spreader, and (12) flagging
 for aerial applications.

      Although the Agency has not identified any endpoints of concern from which to
 perform a handler exposure and risk assessment, it is concerned for inhalation exposure
 of occupational workers to the paniculate fines or dust that may be generated from the
 mixing and loading of the dust-concentrate or wettable-powder formulations and from
 applying the pellet and bait formulations.  The Agency is confident that current labeling
 restrictions, when combined with those required by this document, are adequate and will
 require these formulation specific protections for all appropriate products.

           (2)  Post-Applications Exposure and Assumptions

Residential: There is the possibility of post-application exposures, if (1) baits or tracking
powders applied indoors are not placed out of reach of children and pets or are not
                                      18

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 placed in tamper-resistant bait stations, as specified in labeling; (2) baits applied
 outdoors are not applied underground and deep enough to prevent children and pets from
 finding and eating the baits; (3) baits are available to homeowners .in packages which are
 not tamper resistant and cbuld be accessible to children or pets prior to application; and
 (4) baits resemble food (e.g.,  peanuts), are brightly colored, or are packaged in a way in
. which they could be appealing to children or mistaken by children for food or candy.

 Occupational:  The Agency has determined that there is potential for post-application
 exposure to zinc phosphide in occupational settings, such as workers reentering areas
 following all of the above-ground applications.              ',-'""'

           b.    Occupational and Residential Risk Assessment/Characterization

      There were no endpoints identified for use in an occupational or residential risk
 assessments except for accidental ingestion of a bait, however, the Agency has identified
 several occupational scenarios where inhalation of particulates and/or dusts may occur.
 In order to minimize these occurrences, the Agency is adopting labeling requirements for
 several formulations.  See Section V for specific labeling requirements.

                 (1)   Risk frorh Post-Application Exposures

 Occupational:  Because no lexicological endpoints were identified for occupational
 exposures, a risk assessment was not performed.

 Residential: The Agency has performed a risk assessment based on the possibility of
 accidental ingestion of zinc phosphide. This assessment estimates that a 10 kg child
 could consume 5 grams of product in one swallow. This provides for an estimated dose
 of 500 mg/kg.  A two percent bait would then result in a dose of 10 mg/kg of active
 ingredient. For zinc phosphide, a NOEL for accidental ingestion has been set at 5.0
 mg/fcg. This results in a margin of exposure  (MOE) of 0.5. Generally, the Agency
 considers MOE's of less than 100 as posing an unacceptable risk.

Restricted Entry Intervals                 -                                ,

      There are currently no restricted entry intervals for any zinc phosphide products
and the Agency is not requiring  any at this time.

Incident Reports

      The American Association of Poison Control Centers reported a total of 106
exposures to zinc phosphide in 1996.  Six of these  cases were suicide attempts.
Approximately 80% of exposures occurred in residences and 62% of all  cases involved
children younger than 6 years of age. Ingestion was reported as the route of exposure in
                                      19

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 60.5% of these cases inhalation 18.4%, dermal 14%, ocular 2.6% and unknown in the
 remaining 3.5%.  Excluding the suicide attempts, 13% reported symptoms that were
 considered potentially related to their exposure when they first contacted the Poison
 Control Center.

      The Agency also consulted four incident databases and searched available
 literature. The OPP Incident Data System reports incidents submitted to the Agency
 since 1992 from various sources, including:  registrants, other federal and state health
 and environmental agencies and individual consumers. The California Environmental
 Protection Agency (formerly the California Department of Food and Agriculture) has
 collected uniform data on suspected pesticide poisonings since 1982. In California,
 physicians are required to report all occurrences of illness suspected to be related to
 pesticide exposure; the majority of these occurrences involve occupational workers.  The
 National Pesticide Telecommunications Network (NPTN)  is a toll-free information
 service supported by OPP that includes incident reporting.

      The limited information on human incidents is  difficult to interpret.  Many cases
 have been documented by the WHO, all prior to 1967. The high dosage associated with
 all of these cases (ten were fatal, ten non-fatal) would seem to indicate suicide or suicide
 attempts. The animal incidents identified by  the databases are predominantly due to
 misuse or accidental exposure, with many of the exposures resulting in the death of the
 exposed animal.

      On the list of the highest 200 chemicals for which NPTN received calls from 1984-
 1991, zinc phosphide  was reported to be involved in  16 human incidents and nine animal
 incidents.  Zinc phosphide ranked 165th in a  ranking of 200 chemicals by the number of
 calls received.

      Incident data from Poison Control Centers was collected for 1989 and compared to
 the number of containers in U.S. homes in 1990. Of 83 compounds examined, zinc
 phosphide ranked 21st for number of exposures per million containers  in homes, which
 was not unexpected for a bait product.  None of the top ten compounds were rodenticide
 baits.  For the 12 zinc phosphide cases where the exact product name was provided and
 an outcome determined,  2 cases reported minor and 1 case reported moderate effects.
 There were no major life threatening cases.  No childhood deaths have been reported due
 to zinc phosphide since 1983 when the Poison Centers began systematic data collection.

     Other Rodenticide Incidents

     Data collected by the American Association of  Poison Control Centers (AAPCC)
for 1995 show 17,187 human exposures to all rodenticides. Of concern to EPA is the
number of exposures to children younger than six years-old; in 1995, these totaled
 14,900 or approximately 87% of all exposures. Of the total number of human exposures
                                     20

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 to rodenticides, almost 6500 were significant enough to result in treatment at a health
 care facility.  Even though these reports,do not identify zinc phosphide per.se and most
 of the incidents are reported to have occurred with anticoagulant rodenticides, the
 Agency is concerned about the use pattern. The Agency would anticipate higher
 incidences of zinc phosphide poisoning if it were,more widely used in residential
 settings.                                              .

      Data collected by the AAPCC for 1996 indicate that 17,601 exposures occurred to
 humans.  Of these exposures, over 13,000 occurred in children younger than six years of
 age.  Approximately 5,300 exposures resulted in people seeking treatment at a health
 care facility.                                                ,

      5.   Food Quality Protection Act Considerations

 , .    The Food Quality Protection Act of 1996. (FQPA) amended the FFCDA by setting
 a new safety standard for the establishment of tolerances.  In determining whether a
 tolerance meets the new safety standard, section 408(b)(2)(c) directs EPA to consider
 information concerning the susceptibility of infants and children to pesticide, residues in
 food, available information concerning aggregate exposure to infants and children of
 such residues, as well as the potential for cumulative effects from pesticide residues and
 other substances that have common mechanisms of toxicity.  EPA does not believe
 "accidental ingestion" of baits should be included in the FQPA determination for
 tolerance setting.   ,

      The FQPA amendments to section 408(b)(2)(C) require the EPA to apply an
 additional 10-fold uncertainty factor (safety) unless reliable data demonstrate that the
 additional factor is unnecessary, to protect infants and children.
       -. l                          '      , -                      •          •' •

      Section 408(b)(2)(D) established factors that  the Agency must .consider in
 determining whether the safety standard is met in deciding to issue or reassess tolerances
 These factors include the consideration of available information on the aggregate
 exposures to the pesticide from dietary sources, including drinking water, as well as non--
 occupational exposures such as those derived from  pesticides uses  in and around the
home. The Agency must also consider the potential cumulative effects of the pesticide
for which a tolerance is being sought as well as other substances that have a common
mechanism of toxicity.

           a.    Potential Risks to Infants and Children

      In determining whether an additional  uncertainty factor is  or is not appropriate for
assessing risks to infants and children, EPA considers all reliable data and makes a
decision using a weight-of-evidence approach taking into account the completeness and
                                      21

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  adequacy of the toxicity data base, the nature and severity of the effects observed in pre-
  and post-natal studies, and other information such as epidemiological data.

       Under the directive of the Food Quality Protection Act (FQPA) recently enacted as
  an amendment to the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), the
  Agency determined the following:

       1) The toxicology data base, though adequate for the registration  of a non-food use
       chemical, did not include a two-generation reproductive toxicity study in rats or a
       developmental toxicity study for a non-rodent species.

       2) The data provided no indication of increased sensitivity of fetal rats to in utero
       exposure to zinc phosphide. In the prenatal exposure developmental toxicity study
       in rats, no developmental effects were observed at the highest dose tested (4.0
       mg/kg/day) which was shown to be maternally toxic (maternal deaths, decreased
       body weight and food consumption during treatment).  There was no assessment of
       in utero exposure to non-rodents (rabbits), nor was there an assessment of early
       postnatal exposure.
                                                      i
       The Agency is not requiring these studies  because exposure from food sources is
 expected to be minimal to non-existent.  However, an additional uncertainty factor of 10
 was applied to the Reference Dose calculation to account for  the extrapolation from
 subchronic to chronic exposure, the lack of reproductive toxicity data, and the lack of
 chronic toxicity data in a non-rodent species.  This additional uncertainty factor will also
 accommodate the inability to assess the potential for increased sensitivity of infants and
 children, because of the lack of sufficient animal data on in utero and early postnatal
 exposure to zinc phosphide (a prenatal developmental toxicity study in rabbits and a two
 generation reproductive toxicity study in rats).

      Although residue studies show there were  quantifiable residues in sugarcane, sugar
 beets, and grasses;  these commodities are not direct human foods and no dietary
 consumption is expected.  Also, there is no likelihood of residues of zinc phosphide or
 phosphine being found through transfer of residues on grasses to meat and milk. The
 Agency has determined that there is no likelihood of residues  of zinc phosphide
 occurring in any processed commodities.

           b.   Aggregate Exposure

      In examining aggregate exposure, FQPA directs EPA to take into account available
information concerning exposures from pesticide residues in food and other exposure for
which there is reliable  information. These other exposures may include drinking water
and non-occupational exposure, such as from pesticides used in and around the home,
but do not include accidental ingestion.
                                      22

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       The Agency also believes that in aggregating exposures .it is appropriate to include
 exposures from other chemicals, metabolites, degradates that are the same as the
 substance of toxic concern.  For example, if chemical A and chemical B both produce
 the same metabolite of concern, C, then a risk assessment aggregating all exposures to
 metabolite C will be conducted.  As noted earlier, the compound of toxic concern with
 zinc phosphide is phosphine.  Two fumigants, aluminum and magnesium phosphide/also
 act by generating phosphine.  Tolerances for all three pesticides are expressed in terms
 of phosphine which would suggest that an aggregate exposure/risk assessment for
 phosphine is appropriate. However, the Agency did not aggregate exposures of
 phosphine from the diet, drinking water or residential uses of zinc phosphide because the
 likelihood of exposure is so low. Actual residues of phosphine were only found in
 rangeland grasses, sugar beets and sugarcane.  None of these commodities are consumed
 directly by humans.  There is no expectation of the transfer of phosphine residues to
 meat and milk as any phosphine residues would be metabolized to naturally occurring
 phosphorous compounds and processing of sugarcane and sugar beets would remove any
 zinc phosphide/phosphine residues.

      An aggregate exposure assessment for  the various possible sources of phosphine
 from the uses of zinc phosphide is not warranted,  because as discussed above, the
 likelihood of exposure is so low/unlikely.  The Agency has not yet evaluated exposures
 from the use of aluminum and magnesium phosphide.  However, when it conducts' a
 tolerance reassessment for aluminum and magnesium phosphide; the Agency will only
 aggregate exposures from those uses as the zinc phosphide uses will have no effect on
 the aggregate exposure as discussed above.  Consequently, if a reasonable certainty of no
 harm finding cannot be made, action will be  taken only on the aluminum and/or
 magnesium phosphide tolerances, not the zinc tolerances. For the purposes of this    '
 decision, all zinc phosphide tolerances are assumed to be reassessed.

           c.   Cumulative Risk

      Section 408(b)(2)(d)(v)  requires that, when considering whether to establish,
 modify,  or revoke a tolerance, the Agency consider "available information" concerning
 the cumulative effects of a particular pesticide's residues  and "other substances that have
 a common mechanisms of toxicity."  The Agency believes that "available information"
 in this context might include not only toxicity, chemistry, and exposure data, but also
 scientific policies and methodologies for understanding common mechanisms of toxicity
 and conducting cumulative risk assessments.  For most pesticides, although the Agency
 has some information in its files that may turn out  to be helpful in eventually
 determining whether^ pesticide shares a common mechanisms of toxicity with any other
 substances, EPA does not at this time have the methodologies to resolves the complex
 scientific issues concerning common mechanism of toxicity in a meaningful way.  EPA
has begun a pilot process to study this issue further through the examination of particular
classes of pesticides. The Agency hopes that the results of this pilot process will
                                     23

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  increase the Agency's scientific understanding of this question such that EPA will be
  able to develop and apply scientific principles for better determining which chemicals
  have a common mechanism of toxicity and evaluating cumulative effects of such
  chemicals.  The Agency anticipates, however, that even as its understanding of the
  science of common mechanism increases, decisions on specific classes of chemicals will
  be heavily dependent on chemical specific data, much of which may not be presently
  available.

       Zinc phosphide, aluminum phosphide and magnesium phosphide all generate
 phosphine gas. The Agency believes the generation of phosphine should be considered
 as part of its aggregate assessment.  Other chemicals may share a common mode of
 toxicity with phosphine gas. In general, after EPA develops a methodology for applying
 common mechanism of toxicity issues to risk assessments, the Agency will  develop a
 process (either as part of the periodic review of pesticides or otherwise) to reexamine
 those tolerance decisions made earlier.  However, with respect to zinc phosphide
 tolerance reassessment, any'future cumulative risk determination regarding other
 chemicals that have a common mode of toxicity with phosphine will not include the uses
 of zinc phosphide discussed in this document because the exposures to phosphine from
 zinc phosphide are so unlikely.

 C.   Environmental Assessment

      The environmental fate and effects database on zinc phosphide is adequate and will
 support reregistration eligibility.  Since contamination of the aquatic environment is
 likely from broadcast bait applications by either air or ground, additional toxicity data
 for aquatic organisms is required.  To support broadcast applications, the  following
 ecological effects studies are required:

      72-la      Acute Fish Toxicity (bluegill sunfish)
      72-Ic      Acute Fish Toxicity (rainbow trout)
      72-2       Acute Aquatic Invertebrate Toxicity

      Additionally, the Zinc Phosphide Consortium must consult with EPA prior to
 initiating these  studies to ensure agreement on the appropriate test material and test
protocols.  These data are necessary to adequately evaluate the risk of zinc phosphide to
aquatic organisms.

      1.   Environmental Fate

     The environmental fate assessment for zinc phosphide is  based on a review of data
available in the open literature.  The Agency reviewed these data and considers the
studies submitted by USDA/APHIS (MRIDs 43466302 and 43466303) adequate to
define the environmental fate and transport of zinc phosphide for its current uses.  The
                                     24

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 hydrolysis requirement was previously fulfilled (MRID 00068028).. No additional
 environmental fate data are required at this time.

           a.    Environmental Chemistry, Fate and Transport

                 (1)   Degradation

      Hydrolysis (161-1):  Hydrolysis is reported; to be the major route of dissipation,
 resulting in the formation of volatile phosphine  and zinc ions.  The rate of hydrolysis is
 believed to be pH dependent, with the fastest degradation frate occurring in acid
 solutions.  The rate of hydrolysis of the degradation product, phosphine, appears to be
 pH and soil moisture dependent, with the rate increasing as the pH Increases or'decreases
 from neutrality.

      Photodegradation in Water (161-2): Since data indicate that zinc phosphide has
 no chromophoric groups, it is expected to degrade by hydrolysis prior to photolysis.
 Therefore, photolysis is not expected to be a route of dissipation for zinc phosphide.

      Photodegradation on Soil (161-3): The  data indicate that zinc phosphide does not
 degrade by photolysis before degrading by hydrolysis, however, zinc phosphide in'bait
 formulations  appears to decompose slowly when exposed to either ambient soil moisture
 or dried soil.  Bait formulations exhibited only 12 to 39% reduction of parent material
 due to climatic conditions during exposure periods of 21 to 27 days.  It is likely that
 hydrolysis was the principal decomposition mechanism and that the sluggish
 decomposition rate was due to protection of zinc phosphide by  formulation *additives and
 packaging. In addition, experiments conducted with UV-G light wavelengths show PH3
 photolysis produces phosphates under oxygen-enriched conditions or hydrogen  and PH2
 or PH2" radicals under oxygen-deprived conditions. Soil photolysis, such as that
 occurring through photo-sensitized hydrolysis, is expected  to be minor compared to the
 extensive hydrolysis that occurs in wet soil without exposure to light.

                 (2)   Metabolism

      Aerobic Soil Metabolism (162-1):  The data indicate that zinc phosphide at high
 concentrations may effect the viability of soil organisms, such as soil algae.  Soil
 organisms should be able to utilize the decomposition products  of zinc phosphide at the
 registered application  rates, since they are essential micronutrients for plant life.  In
addition, the  data indicate that parent zinc phosphide at low concentrations is either
relatively stable to aerobic soil metabolism or hydrolyzes before any biotic processes
occur.

      Anaerobic Soil  Metabolism (162-3): Although microbiological-mediated
processes cannot be eliminated in the decomposition of zinc phosphide, no potential
                                      25

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  mechanism has been proposed.  Zinc phosphide degrades by hydrolysis, but appears to
  be pH (degrading under acid and alkaline pHs) and temperature dependent. Since zinc
  phosphide is relatively stable at pH 7, it may not readily decompose in fresh or sea
  water.  Degradation in neutral water is believed to be mainly by sediment
  decomposition. Therefore, zinc phosphide appears to degrade under anaerobic
  conditions in the presence of moisture, without requiring microorganisms assistance.
  Furthermore, phosphine does not appear to be toxic (absorbed) in the absence of oxygen.

       Aerobic  Aquatic Metabolism (162-4):  Additional data indicated that no
  discernible residues, including phosphine, were present seven days after aerial broadcast
  of 2% bait. Data also showed that zinc phosphide  baits (1.4% to 3.8%) degraded slowly
  when submerged in an unknown water for 4 to 10 days (-20% decline in 10 days).

                  (3)   Mobility

      Leaching/adsorption/desorption (163-1): No data exist on the sorption of parent
 zinc phosphide, but it is considered relatively non-mobile.  In moist soils, zinc phosphide
 rapidly degrades to phosphine (PH3) which sorbs to soil and oxidizes to phosphate ions
 and phosphorus.  The sorption of the degradation products appears to increase with
 temperature, however, sorption of degradation products may not be pH dependent.  On
 dried soil zinc phosphide appears to be moderately persistent (half-lives may be greater
 than 1 month).  Since moisture rapidly degrades zinc phosphide, mobility on dried soil
 has not been addressed.  In addition, based on the degradation processes in aqueous
 conditions, zinc phosphide is expected to have a low potential for remaining in soil and
 water environments to cause ground or surface water contamination or creating
 bioaccumulation hazards.

      Volatility-Lab (163-2): The data indicate that in moist soils zinc phosphide
 degrades to a volatile product, phosphine (maximum concentration 32% of applied).
 The rate of volatility appears to be dependent on soil moisture and the pH of the system.
 Appreciable amounts of phosphine were shown to evolve from moist, acidic or basic
 soils, however,  phosphine concentrations from bait use on dried soils or neutral waters
 appear negligible and are liberated too slowly to be  discernible.  Under normal use
 conditions  bait formulations may be moderately persistent. Most of the phosphine
 released during  incubation may be reabsorbed and oxidized to the ions.

     Terrestrial field dissipation (164-1):  The field data appear to confirm the
laboratory data.  Zinc phosphide was reported to dissipate with half-lives of one month
or longer in dry  soils, which may cause the bait formulations to be moderately persistent
under some environmental conditions. In moist soils, zinc phosphide was reported to
dissipate with half-lives of less than 1 week. Data indicate that the application rate will
generally be low enough that residues will not be detectable in plants or soil after  a
                                     26

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 period of time (= 1' to 2 weeks).  In addition, the phosphate and zinc ion decomposition
 products in soil may be utilized by plants as elemental zinc or phosphorus.

       Aquatic field dissipation (164-2): Zinc phosphide was determined to hydrolyze in
 aquatic systems.  Hydrolysis results in the liberation of phosphine (at most =32% of
 applied) .and the release of zinc ions, which may partially convert to zinc phosphate, in
 suspended or bottom sediments.  The rate of dissipation appears to depend on the pH of
 the aquatic systems.  Decomposition of zinc phosphide was reported to increase as the
 pH strayed from neutrality (from no  detection to -32% of applied as phosphine). Zinc
 phosphide was shown to be relatively stable (half-life may be longer than a month in bait
 formulation) in neutral aquatic systems.

            b.    Environmental Fate Assessment

       The environmental fate assessment is based on the review of available literature
 and is not supported by guideline studies. The major route of degradation/dissipation of
 zinc phosphide is hydrolysis, which results in the forrhation of volatile phosphine and
 zinc ions.  Zinc phosphide and its residues appear to be non-persistent under most
 environmental conditions and relatively immobile (zinc ions and dissolved phosphorus
 readily sorb onto soil) in laboratory and  field data.  When applied to dry soil
 environments, zinc phosphide may be moderately persistent (=40% of applied remaining
 at 30 days post-tre.atment). The rates of hydrolysis and volatilization of phosphine
 appear to be pH and soil moisture dependent with the hydrolysis rate increasing as the
 pH increases or decreases  from neutrality. There are limited data available on the
 metabolism (microbial mediated processes) of zinc phosphide.  It is believed that zinc
 phosphide hydrolyzes prior to biotic metabolism, however, a potential  metabolism
 process has not been  described. It has been noted that in the presence of oxygen, soil
 organisms appear to utilize the decomposition products when present at low
 concentrations.  Zinc phosphide degrades rapidly to Zn2+ and PH3, which sorb strongly
 to soil and are common nutrients in soil.   Zinc phosphide and its degradation products
 appear to have a low  potential for ground water or surface water contamination.

      2.    Ecological Effects

            a.    Toxicity to Terrestrial Animals

                 (1)    Birds, Acute  and Subacute

      An acute oral toxicity study using the technical grade of the active ingredient
 (TGAI)  is  required to establish the toxicity of zinc phosphide to birds.  The preferred test
 species is either mallard duck (a waterfowl)^ or bobwhite quail (an upland gamebird).
"Results of this test are tabulated below.
                                      27

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Avian Acute Oral Toxicity
Species
Northern bobwhite quail
(Colinus virginianus)
Mallard duck
(Anas plaryrhynchos)
% AI
TGAI
TGAI
LD50 mg/kg
12.9 (12.0-13.9)
67.4 (56.3-80.9)
Toxicity
High
Moderate
MRID
00006032
00006033 ,
       Since the LD50 falls in the range of 12.0 to 13.9 mg/kg,  zinc phosphide is Highly
 Toxic to avian species (Bobwhite quail) on an acute oral basis.  The guideline (71-1) is
 fulfilled.  (MRIDs 00006032 and 00006033)

       Two subacute dietary studies using the TGAI are required to establish the toxicity
 of zinc phosphide to birds.  The preferred test species are mallard duck and bobwhite
 quail. Results of these tests are tabulated below.
Avian Subacute Dietary Toxicity
Species
Northern bobwhite quail
(Colinus virginianus)
Mallard duck
(Anas platyrhynchos)
% AI
TGAI
. TGAI
5-Day LCSO
(ppm)'
469(356-546)
2885
(1970 - 4329) .
Toxicity
Category
High
Slight
MRID
00006031
00006025
      Test organisms observed an additional three days while on untreated feed.

      Zinc phosphide, especially at higher doses, repels and has an emetic effect on
 birds. Mallards are particularly susceptible, indicating that the actual LC50s are
 probably lower than those recorded under laboratory conditions.  Since the LC50 for
 Bobwhite quail is 468.5 ppm,  zinc phosphide is considered to be highly toxic to
 avian species on a subacute dietary basis.  The guideline (71-2) is fulfilled (MRID
 00006025)

                 (2)   Birds, Chronic

      Avian reproduction studies for  a chemical are required when any of the
following conditions are met:  (1) birds may be subject to repeated or continuous
exposure to the pesticide, especially preceding or during the breeding season, (2) the
pesticide is stable in the environment to the extent that potentially toxic amounts may
persist in animal feed, (3) the pesticide is stored or accumulates in plant or animal
                                     28

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 tissues, and/or, (4) information derived from mammalian reproduction studies
 indicates reproduction in terrestrial vertebrates may be adversely affected by the
 anticipated use of the product. The preferred test species are mallard duck and
 bqbwhite quail.                \

      Although zinc phosphide bait will eventually degrade in the field, it may be
 stable under dry conditions at levels known to kill non-target animals for more than a
 month.  Although some species of birds are exposed during their breeding season,
 any bird that eats the bait is expected to die from acute poisoning. Chronic effects
 are not expected. Avian reproduction studies are not required at this time.

                 (3)   Mammals, Acute'and Chronic

      Wild mammal testing is required on a case-by-case basis, depending on the
 results of lower tier laboratory mammalian studies, intended  use pattern and pertinent
 environmental fate characteristics. In most cases, rat or mouse toxicity values
 required for the Agency's human health assessment substitute for wild mammal
 testing.  As reported earlier< zinc phosphide in laboratory rats was shown to have an
 LD50 of 21 mg/kg,  when administered by gavage: (MRID 00085366)

      No studies have been  submitted on the acute toxicity of zinc phosphide to wild
 mammals.  Some LD50s reported in the literature also have been listed to aid the
 decision to require  acute or chronic mammalian toxicity studies and to help interpret
 the secondary poisoning studies.             '
'l * " : '
Wild Mammal Toxicity*
Species
Desert kit fox
California ground squirrel '
Black-tailed prairie dog
Northern pocket gopher
Norway rat (wild)
Roof rat
LD50
(mg/kg)
93.0 ',
33.1
18.0
6.8
27-40
2.9-40.5; .
Species
Meadow vole
Nutria
Woodrat(LD100)
Black-tailed
jackrabbit
Polynesian rat

LDso
(mg/kg)
18.0
5.55
25!0
8.25
23.0

     Prevention and Control of Wildlife Damage (Zinc Phosphide, p. G-58). Timm fed.i. 1994

     The results from the above studies indicate that zinc phosphide is highly to very
highly toxic to small mammals on an acute oral basis, No chronic,studies have been
                                    29

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 reviewed or required.  Due to the fatal nature of zinc phosphide poisonings, chronic
 studies are not necessary.

                 (4)  Terrestrial Testing

      The Zinc Phosphide Consortium is currently conducting two terrestrial field
 studies.  One study is to determine the residues available on alfalfa following
 broadcast applications of a 2% bait in flood irrigated and sprinkler irrigated alfalfa
 fields.  The other study is to determine nontarget hazards to pheasants in alfalfa fields
 that have been treated with a broadcast application of 2% zinc phosphide. The
 testing is expected to be completed within a year.
                                      *                       .

            b.    Toxicity to Freshwater Aquatic Animals

      Zinc phosphide has a very low water solubility.  When water is acidic or basic,
 zinc phosphide disassociates rapidly and produces phosphine gas (a toxic degradate
 that kills the target rodents).  Zinc phosphide is believed to be toxic to aquatic
 organisms,  however, it is unclear what agent  is  responsible for the toxicity.
 Currently there are no acute or chronic aquatic toxicity data available.  Due to the
 uncertainties, test protocols must be agreed upon before initiation  of any aquatic
 tests.

                 (1)   Freshwater Fish, Acute

      Two freshwater fish toxicity studies using  the TGAI are required to establish
 the toxicity of zinc phosphide to fish.  The preferred test species are rainbow trout (a
 coldwater fish) and bluegill sunfish (a warmwater fish).  No acceptable acute
 freshwater fish studies have been submitted. These data are now required.

                 (2)  Freshwater Fish, Chronic

      A freshwater fish early life-stage (guideline 72-4) test is not required at this
 time because the  Agency does not expect chronic aquatic exposure from zinc
 phosphide use. Once the acute toxicity testing is performed, the Agency will
 determine whether chronic testing is needed.  The preferred test species is rainbow
 trout.

                 (3)  Freshwater Invertebrates, Acute

     A freshwater aquatic invertebrate toxicity test (guideline 72-2) using technical
grade active ingredient is required to establish the toxicity of zinc phosphide to
aquatic invertebrates. The preferred test species is Daphnia magna.  No acceptable
studies have been submitted.
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       3.    Exposure and Risk Characterization
                    i               '                   -              -       '

            a.  Primary Exposure and Risk to Nontarget Terrestrial Animals

       Primary nontarget exposure is the ingestiqn of a toxicant by an animal other
 that the target species. The following table .summarizes three non-guideline studies
 that address exposure and risk in field uses  of zinc phosphide:   .
Primary Non-Target Exposure and Risk to Animals
Study Name
Primary and secondary hazards of zinc
phosphide to nontarget wildlife
Nontarget hazards to ring-necked pheasants
and California quail •
Hazards to Pheasant and Cottontail rabbits
associated with zinc phosphide
MRID
42306201
43586602
00005918
Conclusions
Little non-target poisoning
Broadcast application killed Ring-necked
pheasants, but not California quail
Nontarget mortality occurred
      One submitted study reviewed the literature on zinc phosphide use submitted by
 the Animal and Plant Health Inspection Service of USDA (APHIS). These studies
 covered various habitats with various zinc phosphide poisoning regimes.  Some
 studies were specifically designed to investigate the effects of zinc phosphide usage
 while others reported on it as incidental to their primary purpose.  Mortality of
 nontarget rodents during the management of prairie dog and ground squirrel colonies
 from zinc phosphide applications was documented.  Baiting in orchards produced
 mortality  in rabbits, gallinaceous birds, and grain-eating passerine birds.  Six birds of
 a group of-24 found dead in a sugar cane field that was treated with zinc phosphide
 were found to have eaten the bait. Mortality from zinc phosphide applications  also
 was documented for deer, chickens, upland game birds, waterfowl, and aquatic
 invertebrates in Hawaii.  Canada geese were killed in baited alfalfa enclosures.

     The general finding is  that after the experimenters put down poison, very few,
 if any, primary nontarget victims were discovered.  Any bodies found were
 considered to be isolated occurrences  of little importance and concluded that the
 populations were not effected.  "Because many species of rodents are associated with
 prairie dog and ground squirrel colonies, several instances of mortality to these
 species  from zinc phosphide applications have been documented.  Most mortality to
nontarget rodents, hpwever, has been localized and involved only a few individuals "
 (MRID  42306201)

     In another study, 2% zinc phosphide  grain bait was applied by broadcast per
label directions in 2-ha enclosures.  Ring-nec,ked pheasants were killed, but
California quail were not because they did  not eat the poisoned grain. The study did
                                    31

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 not address nontafget hazards to voles, but implies that voles would be killed as a
 nontarget species if they were in the treated areas. (MRID 43586602)

       A separate study baited an orchard with air and ground broadcast equipment at
 a rate of five to ten pounds of zinc phosphide per acre. Intensive ground searches of
 672 acres from day-1 to day-159 revealed that 1 of 5 radio tracked Ring-necked
 pheasants was killed by zinc phosphide. Four dead  rabbits, 3 Deer mice and 1 Blue
 jay also were found to contain zinc phosphide residues.  (MRID 00005918)

       Generally the experimenters in the submitted studies distributed poison but
 didn't find any (or very few) primary nontarget victims.  They considered any bodies
 they found to be isolated occurrences that were of little importance and concluded
 that the populations were not effected.  The Agency does not necessarily agree with
 these  conclusions but will consider the findings of these studies useful in risk
 assessments.

      The reviewed literature suggests that waterfowl and some passerines appear to
 be relatively sensitive to zinc phosphide.  It was also reported that many birds appear
 capable of distinguishing treated from untreated bait,  and prefer untreated grain when
 given  a choice. The study authors suggest several factors that influence the
 magnitude of effects, including prior exposure to untreated bait, nutritional condition
 of the bird when provided treated baits, availability of alternate food sources,  and
 ability to regurgitate treated baits.

     The Agency has concluded that the studies reviewed (including supplemental
 and published studies) show that the use of zinc phosphide in agricultural fields will
 likely  kill nontarget birds and mammals. Zinc phosphide is a very toxic substance
 and will kill most animals to which it is administered.  Rodents are more sensitive
 than carnivores. Although gallinaceous birds (pheasants, turkeys, other large
 terrestrial birds) are more sensitive than other avian species, some passerines such as
 Red-winged blackbirds are also sensitive.

           b.   Secondary Exposure/Risk to Nontarget Terrestrial Animals

     If a target animal eats the toxicant and is subsequently eaten by a predator or a
scavenger, secondary poisoning may occur to the predator or scavenger. The
following table summarizes studies that have been submitted to address the extent of
secondary poisoning that occurs with zinc phosphide:
                                    32

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Secondary Exposure and Risk to Animals
Study Name
Primary and secondary hazards of
Zinc phosphide to nontarget wildlife
Black-tailed prairie dog - domestic
ferret secondary poisoning study
Responses of Siberian ferrets, to
secondary. Zinc phosphide poisoning
MRID
42306201
41507401
00151407
Study
Classification
Supplemental
Core
Core
Conclusions
Little nontarget poisoning, no
secondary poisoning '
no secondary poisoning,
residues in stomach, ferrets
regurgitated poison
Non-lethal acute intoxication
of Siberian ferrets
      One study presents a long list of LD50 and other toxicity tests done with zinc
 phosphide. Most of the experimenters conducted informal studies to use up excess
 specimens or were incidental to other studies. Although few of the LD50 or LC50
 values are definitive, some may be useful as a guide.  (MRID 42306201)

      Secondary poisoning experiments have been conducted with a variety of
 carnivorous mammals and birds. The  risk of secondary poisoning is  low because
 zinc phosphide does not accumulate in the tissues of the target animals. The primary
 source of zinc phosphide to a carnivorous or scavenging animal is the digestive tract
 of the target animal, where unreacted zinc phosphide may  remain. Most animals,
 when given a  choice, refuse to eat the digestive tract of poisoned animals.  Even if
 the digestive, tract is eaten, the poison decomposes further  in the digestive tract of the
 second animal.  Zinc phosphide has a strong emetic action and frequently causes
 regurgitation. These studies  concluded that, "secondary, poisoning is  reduced because
 mammalian predators appear to be less susceptible to zinc phosphide than other   -
 species."              ,            -                                           ;

      One study reviewed studies conducted in various habitats with various zinc
 phosphide poisoning regimes. Some studies were specifically designed to investigate
 the effects of zinc phosphide  usage while others report it as incidental to their
 primary purpose.  The general finding is that the experimenters distributed poison,
 but uncovered few if any secondary or nontarget victims.  The carcasses found were
 considered to be isolated occurrences and of little importance. The papers reviewed
 do not describe how intensively or extensively .the experimenters searched for dead
 animals.  None of the papers  dealt with the mathematical reasoning behind the choice
 of poisoning regime, plot extent, or body search plan.  (MRID 42306201)

     The study comments on several reports of incidents Involving zinc phosphide.
However, the study authors could not prove that zinc phosphide was responsible for
the kill, whether the kill was,due to, misuse or following outdated label instructions.
 "Many cases of secondary poisoning have involved cats and dogs, possibly because
                                    33

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  these species have been noted to consume stomach contents of poisoned animals in
  laboratory studies, whereas wild carnivores tend to avoid consuming the GI tract."

       Matschke and Andrews (1990) found that: (1) No poisoning symptoms were
  observed in the ferrets that were fed the prairie dogs; (2) 96% of the zinc phosphide
  residues in the rodents were found in the stomach; (3) the ferrets regurgitated
  gavaged zinc phosphide; therefore, a good LD50 was not  (and probably cannot) be
  determined.  "The low amounts of zinc phosphide remaining in the carcasses and the
  absence of mortality, poisoning symptoms or emesis, in spite of the emetic properties
  of zinc phosphide, suggest that the risk of secondary poisoning from zinc phosphide
  is low."  (MRID 41507401)

      Hill and Carpenter's (1982) study demonstrated evidence of acute intoxication
 of Siberian ferrets fed zinc phosphide-poisoned rats. Overt evidence of acute
 intoxication was emesis by the ferrets.  Subacute zinc phosphide toxicity in the
 ferrets was indicated by significant decreases in hemoglobin, cholesterol, and
 triglycerides. The study demonstrates that ferrets, or other species with a sensitive "
 emetic reflex, may be  afforded some degree of protection from secondary acute zinc
 phosphide poisoning due to its emetic action. However, the study also clearly
 demonstrates the potential for secondary exposure of nontarget animals to zinc
 phosphide.  The study provides no data indicative of zinc phosphide residues to
 which predators and scavengers may be secondarily exposed, nor does it provide an
 indication of the relative sensitivity of Siberian ferrets to  zinc phosphide poisoning
 (MRID 00151407)

      The Agency .concludes that predators or scavengers  who eat a target animal that
 has been killed by zinc phosphide will not be killed. .They may become ill, listless,
 and regurgitate. Further studies on secondary poisoning are not necessary.

           c.   Exposure and Risk to Nontarget Freshwater Animals

      The Agency presumes that aquatic exposure may occur from aerial and ground
 broadcasting of zinc phosphide baits, however, risk cannot be assessed until
 acceptable toxicity data are submitted.  No presumption of risk to aquatic organisms
 is made for hand-placed applications, because minimal exposure of aquatic organisms
 is expected when baits  are placed by hand.

           d.   Endangered Species Concerns

      Zinc phosphide was addressed in the "U.S.  Fish and Wildlife Service Biological
Opinion March,  1993"  document. That Opinion is based on zinc phosphide's use for
control of rodents in/on orchards, rangeland, forests, vineyards, sugarcane,
macadamia nuts, agricultural crops, ornamentals, lawns, golf courses, recreational
                                    34

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      areas, rights-of-way, animal burrows, and in and around all types of buildings. The
      Service made a "jeopardy" determination for 35 species that were determined to be
      potentially exposed from these uses.  Of these 35 species, 29 (20 mammalian,  9
      avian) were determined to be in a "jeopardy" status. Other species were considered
      either not at risk of exposure or not likely to beiaffected. .See Section IV for a
      description of the Agency's Endangered Species Program policy.


IV.   RISK MANAGEMENT AND REREGISTRATION DECISION

      A.    Determination of Eligibility

           Section 4(g)(2)(A)  of FIFRA calls for the Agency to determine, after
      submission of relevant data concerning an active ingredient,  whether products
      containing the active ingredient are eligible for reregistration.  The Agency has
     previously identified and required the submission of the generic (i.e. active
     ingredient specific) data  required to support reregistration of products containing zinc
  ,.   phosphide as the active ingredient. The Agency has completed its review of these
     generic data, and has determined that the data are sufficient to support reregistration
     of products containing zinc phosphide;  Appendix B identifies the generic data
     requirements that the Agency reviewed as part of its determination of reregistration
     eligibility of zinc phosphide, and lists the  submitted studies that the Agency found
     acceptable.      ,

          The data identified  in Appendix B were sufficient to allow the Agency to  assess
     the registered uses of zinc phosphide and to determine that zinc phosphide, labeled
     and used as specified in this document, can be used without resulting in unreasonable
     adverse effects  to humans and the environment.  Therefore, the Agency finds that
     products containing zinc  phosphide as the active ingredient are eligible for
     r.eregistration.  The reregistration of particular products is addressed in Section V of
     this document.

          The Agency made its reregistration eligibility determination based upon the
     target data base required  for reregistration, the current guidelines for conducting
     acceptable studies to  generate such data, published scientific literature, etc. and the
     data identified in Appendix  B. Although the Agency has found that all uses of zinc
     phosphide are eligible for reregistration, it should be understood that the Agency may
     take appropriate regulatory action, and/or require the submission of additional data  to
     support the registration of products containing zinc phosphide, if new information
     comes to the Agency's attention or if the data requirements for registration (or the
     guidelines for generating  such data) change.
                                         35

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 B.   Determination of Eligibility Decision

      1.    Eligibility Decision

      Based on the reviews of the generic data for the active ingredient zinc
 phosphide, the Agency has sufficient information on the health effects of zinc
 phosphide and on its potential for causing adverse effects in fish and wildlife and the
 environment.  The Agency has determined that zinc phosphide products, labeled and
 used as specified in this Reregistration Eligibility Decision, will not pose
 unreasonable risks or adverse effects to humans or the environment.  Therefore, the
 Agency concludes that all products containing zinc phosphide are eligible for
 reregistration.

      2.   Eligible and Ineligible Uses

      The Agency has  determined that all uses of zinc phosphide, as specified in this
 document, are eligible for reregistration.  These uses include:  indoor and outdoor
 residential and agricultural areas (including in and around homes, lawns, bulbs, in
 and around outside buildings/barns, rights-of-ways/fencerows/hedgerows),  indoor
 and outdoor commercial or institutional premises and equipment, golf courses,
 reforestation areas.  The following crop uses  are eligible and are regarded as non-
 food uses because the application method and other label restrictions do  not result in
 residues:  alfalfa, barley, berries (dormant), oats; sugar maple, wheat, no-till corn,
 macadamia nut orchards, orchards/groves (post-harvest and dormant), timothy (hay).
 Food uses for zinc phosphide include: grapes, rangeland grasses and sugarcane.
 Artichokes and sugar beets have regional tolerances for use in California; currently
 there are no labels that include use on artichokes.
             «                  *                          •

 C.   Regulatory Position

      The following is  a summary of the regulatory positions and rationales  for zinc
phosphide.  Where labeling revisions are imposed, specific  language is set forth in
Section V of this document.

      1.    Food Quality Protection Act Findings

           a.    Determination of Safety for U.S. Population

     EPA has determined that the established tolerances for zinc phosphide, with
amendments and changes as specified in this document, meet the safety standards
under the FQPA amendments to section 408(b)(2)(D) for the general population. In
reaching this determination, EPA has considered the available information on the
                                    36

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 aggregate exposures (both acute and chronic) from non-occupational sources, food
 and drinking water.

      For zinc phosphide, there is little likelihood of residues in water, on food items
 or processed food items and non-accidental residential exposure will be minimal.
 Therefore, no  acute or chronic dietary, or drinking water, risk assessments were
 conducted and aggregate risk assessments are not necessary for zinc phosphide at this
 time.

      Zinc phosphide, aluminum phosphide and magnesium phosphide all generate
 phosphine gas. The Agency believes the generation of phosphine should be
 considered as part of its aggregate assessment.  Other chemicals may share a common
 mode of toxicity with phosphine gas.  In general, after EPA develops a methodology
 for applying common mechanism of toxicity issues to risk assessments, the Agency
 will develop a  process (either as part of the periodic review of pesticides or
 otherwise) to reexamine those tolerance decisions made earlier.  However, with
 respect to zinc phosphide tolerance reassessment, any future cumulative risk
 determination regarding other chemicals that have a common mode of toxicity with
 phosphine will not include the uses of zinc phosphide discussed in this document
 because the exposures to phosphine from zinc phosphide are so unlikely.  For the
 purposes  of this decision, all zinc phosphide tolerances are assumed to be reassessed.

           b.   Determination of Safety for Infants and Children

     EPA has determined that the established tolerances for zinc phosphide, with.
 amendments  and changes as specified in this document, meet the safety standards
 under the FQPA amendments to section 408(b)(2)(C) for infants  and children.  The
 safety determination for infants and children considers the factors noted above for the
 general population, but also takes into account the possibility of increased dietary
 exposure  due to the specific consumption patterns of infants and children, as well as
 the possibility of increased susceptibility to the toxic effects of zinc phosphide
 residues in this,population subgroup.

     In determining whether or not infants and children are particularly susceptible
 to toxic effects from zinc phosphide residues, EPA considered the completeness of
 the database for developmental  and reproductive effects, the nature and severity of
 the effects observed, and other  information.            •              '

     The toxicology data base, though adequate for the registration of a non-food use
 chemical, did not include a two-generation reproductive toxicity study in rats, nor  did
 it include  a developmental toxicity for a non-rodent species.  The data provided no  •
 indication of increased sensitivity, of fetal rats to 'in. utero exposure to zinc phosphide.
In the prenatal  exposure developmental toxicity study in rats, no  developmental
                                    37

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 effects were observed at the highest dose tested (4.0 mg/kg/day) that was shown to be
 maternally toxic (maternal deaths, decreased body weight and food consumption
 during treatment).                                                 ,

      The Agency is not requiring these studies at this time because exposure from
 food sources is expected to be minimal to non-existent, however, the Agency
 established an RfD based on the anticipation that a chronic dietary risk assessment
 would be required.  The RfD is 0.0001 mg/kg based on a subchronic oral study that  '
 showed no effects at 0.1 mg/kg.  The Agency found, in its evaluation of dietary risk
 for zinc phosphide subsequent to the RfD determination, that no dietary or drinking
 water exposure will be expected and no risk assessment is necessary.  Should a risk
 assessment be  required in the future, due to treated food crops, an additional
 uncertainty factor of 10 would be applied to the Reference Dose calculation.  This
 uncertainty factor would account for the extrapolation from subchronic to chronic
 exposure, the lack of reproductive toxicity data, and the lack of chronic toxicity data
 in a non-rodent species.  The RfD of 0.0001 mg/kg reflects this additional
 uncertainty factor. If food uses showing dietary exposure are proposed for
 registration, a  risk assessment will have to be performed.  If risks are unacceptable
 using the current RfD, which reflects an additional uncertainty factor of 10, further
 studies  will be required.

      The Agency does not believe that exposure from the accidental ingestion of
 baits should be used in making the tolerance safety finding under FQPA.  These
 exposures are accidental in nature and should not be considered as part of the  FQPA
 calculus for non-occupational exposure. The dietary and drinking water
 contributions from zinc phosphide are negligible.

      In deciding to continue to make reregistration determinations during the  early
 stages of FQPA implementations, EPA recognizes that it will  be necessary to make
 decisions  relating to FQPA before the implementation process is complete. In
 making these early, case-by-case decisions, EPA does not intend to set broad
 precedents for  the application of FQPA to its regulatory determinations.  Rather,
 these early decisions will be made on a case-by-case basis and will not bind EPA as it
 proceeds with further policy development and rulemaking that may be required.

     EPA may determine, as a result of this later implementation process, that any
of the determinations described in this RED are no longer appropriate. In this case,
the  Agency will consider itself free to pursue whatever action may be appropriate,
including but not limited to, reconsideration of any portion of this RED.
                                    38

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           c.   Effects to the Endocrine System

      EPA is required to develop a screening program to determine whether-certain
 substances (including all active ingredient pesticides and inerts) "may have an effect
 in humans that is similar to an effect predicted by a naturally occurring estrogen, or
 such other endocrine effect."  The Agency is currently working with interested
 stakeholders, including other government agencies, public interest groups, industry
 and research scientists in developing a screening and testing program and a priority
 setting scheme to implement this program.  Congress has allowed 3 years from the
 passage of FQPA (August 3,  1999) to implement this program.  At that time, EPA
 may require further testing of this active ingredient and end-use products.

     2.    Benefits of Rodenticides

     Toxic rodenticides are the most efficient available means for controlling
 existing infestations of large numbers of pest rodents. These agents also may be the
 method of choice in controlling certain smaller rodent infestations and often are
 needed to control individuals that cannot be removed by use of traps.

     People  control rodent pests primarily because  these animals (1) are associated
 with the spread of many types of serious diseases; (2) bite humans; (3) damage
 private and commercial property; (4) destroy and contaminate millions of tons of
 agricultural crops annually, both in the field and in storage; and (5) are generally
 unwelcome in homes, schools, places,of business, and other areas occupied or
 frequented by humans.                                             ,
                               *                '        .
     The diseases vectored by rodents include: plague, Rickettsial diseases (e.g.,
 murine typhus, Rickettsialpox),  leptospirosis, rat bite fever, Salmonellbsis,
 hantavirus, Lyme disease, granulocytic Ehrlichosis, relapsing fever, and others.
 Rodents transmit diseases either directly or indirectly, via ectoparasites such as fleas,
 ticks or mites, or bodily waste products and secretions.

     Many rodent-vectored diseases recently have been held in check through the
 private and public use of toxic rodenticides, along with, other pest and disease control
 and management practices. Government agencies at times conduct rodent control
 programs  in communities or parks, but actions of private citizens may affect the
 outcomes  of such efforts significantly.  Improved pest management,  including
 coordination of rodenticide use and Other rodent abatement practices, is a principal
 reason why numbers of cases and deaths associated with many rodent-vectored
diseases have been much lower in the latter part of the twentieth century than was the
 case in prior decades.. For example, there were 3,700 reported cases of murine
typhus in the U.S. in 1942 but only 12 reported cases in 1987.  In recent decades,
however,  "new" rodent-vectored diseases such as Lyme disease and hantavirus have
                                    39

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  emerged, primarily in rural and semi-rural areas in the U.S. Of these diseases, the
  HPS hantavirus strains appear to be the most serious, with a composite fatality rate of
  approximately 45% for the 170+ human cases reported since 1993.

      Approximately 14,000 humans are bitten by rats each year.  Recent information
  on this subject may not be available on a nationwide basis.

      Rodents damage structures by gnawing on integral parts and as a result of
  contamination from bodily waste products and other secretions.  Rodents can gnaw
  through wood, concrete,  asphalt, sheet rock, plumbing, and soft metals.  Rodent
  damage to electrical wiring has been cited as the probable cause for certain fires and
  explosions, as well as an instance of shutting down the Internet. When buildings,
  including residences, are heavily infested, poisoning generally is an integral
  component of successful abatement programs.

      "Field" rodents such as ground squirrels,  voles, and native mice and rats cause
 significant damage to crops and rangelands.  Certain crops, such as sugarcane, are
 heavily damaged in the field by commensal rats  and mice.  Commensal rodent species
 are primarily responsible for vertebrate pest damage  to stored food and feed in the
 U.S. Zinc phosphide plays an important role in the management of rodents
 associated with agricultural crops.

      Commensal rats and mice are not particularly "liked" by humans. This
 circumstance  may be a factor in rodenticide use, however, disease concerns and
 desires to protect self and property also are likely to be valid in most cases in which
 rodenticide baits are used.

      Rodenticide baits also are used in certain special circumstances, such as
 managing or eradicating non-native rodent species at  sites where such rodents
jeopardize the continued existence of certain threatened or endangered species.
 Control programs of this nature are run by government agencies and typically are
 limited to offshore islands or other refuge areas.

      3.   Tolerance Reassessment

      Tolerances  for residues of zinc phosphide in/on plant commodities [40 CFR
§180.284 (a) and (b)] are expressed in terms of phosphine resulting from use of zinc
phosphide. The table following the tolerance discussion presents a summary of zinc
phosphide tolerance reassessments as well as corrections to definitions of some
commodities.
                                    40

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 Tolerances Listed Under 40 CFR §180.284 (a)         '

      Pending resolution of storage stability issues, adequate data are available to
 reassess the established tolerances for the following commodities, as defined:
 grapes, grasses (rangeland), and sugarcane.            '                    '

      Available sugarcane processing data suggest that tolerances for sugarcane
 processed fractions are not required. No grape processing data will be required,
 provided grape field trial samples were analyzed within 30 days of collection.
     /                 "             ""     -   '   '
 Tolerances Listed Under 40 CFR §180.284 (b)

      Adequate data are available to reassess the established  tolerances with regional
 registration, in accordance with 40 CFR §180.1 (n), for the  following commodities,
 as defined: artichoke (globe), sugar beet (roots), and sugar  beet (tops).  Zinc
 phosphide is not presently registered for use on artichokes.  If the registrant(s) wish
 to retain the tolerances with regional registration established for these commodities,
 then they must propose use directions reflecting the use patterns for which adequate
 residue data from the original tolerance petitions are available.  Alternatively,
 registrant(s) may wish to register zinc phosphide products  for non-food uses only
 with' concurrent revocation of existing tolerances.  Discussion of non-food uses
 appears under GLN 860.1200 in  Section III of this  RED.

 Tolerances Needed as a Result of Uses in Food Handling Establishments

     Some currently registered uses of zinc phosphide normally require tolerances
and supporting data for Food Handling Establishment tolerances. Based on labeling
restrictions for those products that are used in these areas,  the Agency will waive this
requirement provided that all products for use in food-handling establishments
sufficiently restrict their application such that the use is considered non-food.
Specific requirements have been outlined in Section IIIB and labeling in Section V.
                                    41

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Tolerance Reassessment Summary For Zinc Phosphide
Commodity
Current
Tolerance (ppm)
Tolerance
Reassessment (ppm)
Comment */
[Correct Commodity Definition]
Tolerances Listed Under 40 CFR §180.284 (a):
Grapes
Grasses (rangeland)
Grasses (hay)
Sugarcane
0.01
0.1

0.01
0.01
0.1
0.4
0.01

[Grass, forage]
[Grass, hay]

Tolerances Listed Under 40 CFR §180.284 (b):
Artichoke (globe)
Sugar beet (roots)
Sugar beet (tops)
0.01
0.04
0.02
0.01 "
0.04 "
0.02 " '
[Artichoke, globe]
[Sugar beet, roots]
[Sugar beet, tops]
 M    All tolerance reassessments are tentative pending adequate resolution of storage stability issues.
      If the registrant(s) wish to retain the tolerances with regional registration established for these
      commodities, then they must propose use directions reflecting the use patterns for which adequate
      residue data from the original tolerance petitions are available.  Alternatively, registrant(s) may
      register zinc phosphide products for non-food uses only with concurrent revocation of existing
      tolerances. For discussion of non-food uses see GLN 860.1200 in Section HI. RED.


      4.    Codex Harmonization


      No Codex MRLs have been established for zinc phosphide; therefore, issues of
 compatibility between Codex MRLs and U.S.  tolerances do not exist.


      5.    Summary of Risk Management Decisions


            a.    Human Health


                 (1)   Dietary


                 Acute Dietary


      The Agency  has determined that acute  dietary exposure and risk associated with
the use of zinc phosphide is negligible.  Of those commodities designated as food
uses for zinc phosphide, three were found to have detectable residues after
application (grasses, sugar beets, sugarcane).  Since these three crops are not direct.
human  food items, acute dietary consumption is not expected.


                 Chronic Dietary (including  cancer)


      The Agency has determined that there will be no chronic dietary exposure or
risk associated with the use of zinc phosphide. Residues are not expected on raw
food items, as noted above.  Also, zinc phosphide will not concentrate during the
                                       42

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 processing of any "commodity because the act of processing will not allow for
 unreacted zinc phosphide to remain on the fractions.  Since chronic exposure and risk
 associated with the use of zinc phosphide is negligible, no risk of cancer is expected
 from the use of zinc phosphide.

                (2)   Accidental Residential Exposure

      Rodenticides, when used as currently sold and marketed, are associated with a
 high number of human incidents and accidental exposures each year.  Although the
 number of incidents  attributable  to zinc phosphide is limited, EPA is concerned that
 the small numbers do not reflect a limited risk, but rather a limited market share in
 residential settings.  Therefore, EPA remains concerned about the continued risk of
 exposure to humans, especially children, from rodenticides used in residential
 settings. For zinc phosphide, an MOE of 0.5 was determined for accidental ingestion
 of the bait formulation by a child.  This calculation was based on an acute
 neurotoxicity study and an estimate of how much a child could accidentally ingest.
 Generally, the Agency considers an MOE of 100 or more to be protective of public
 health.  The Agency has  also determined that a" single swallow of zinc phosphide bait
 may be fatal to a young child.  There is also  considerable trauma and expense
 associated with medical treatment of children thought to have been exposed to
 rodenticides.  To mitigate the potential risk to children from accidental ingestion of
 baits, the Agency is requiring several mitigation measures that will be implemented
 in two .phases that will be discussed shortly.                             '••..••

      EPA expressed its concern regarding human exposures and incidents to
 rodenticides used.in and around the home in  PR Notice 94-7.  This Notice, entitled
 Label Improvement Program for the Revision of Use Directions for Commensal
 Rodenticides and Statement of the Agency's Policies on the Use of Rodenticide Bait
 Stations, was issued by the Agency on September 16, 1994, and required registrants
 of certain rodenticide products that claimed to control commensal rodents to revise
 the labeling  of such products to bear certain statements concerning "tamper-resistant
bait stations." The Notice also informed rodenticide registrants, applicants, and
 other interested persons of EPA's continued concern for the safe use of rodenticides.
 Moreover, PR Notice 94-7 outlined EPA's policies regarding the isolation of
 commensal rodenticides from children, dogs,  other pets, domestic animals, and non-
target wildlife. PR Notice 94-7, in part, stated:     .

      "Historically, more than  1000 incidents of human exposure to rodent
     poisons have been reported annually in the U.S.  Numbers of human
     incidents reported have increased greatly in recent years with the advent
     of a new reporting network. In 1988, more than  10,000  rodenticide
     incidents were reported in the American Association of Poison Control
     Center's National Data Collection System. Nearly 90% of these cases
                                    43

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      involved children under six years of age. Nearly all of such exposures are
      classed as accidents. The human exposure incidents that are reported may
      represent less than half of those which occur.  Well over 80% of reported
      human rodenticide exposures involve anticoagulant compounds.

      Young children thought to have been exposed to rodenticides are often
      given some medical attention,  although symptoms of poisoning usually are
      not observed, especially in cases involving anticoagulants which act very
      slowly. Although young children have been killed by rodenticides, most
      rodenticide-related deaths of humans result from intentional ingestions by
      persons much older than five years of age.

      While reports summarizing incidents typically do not indicate exactly how
      exposures have occurred,  it is likely that most accidents are related to
      improper use rather than to improper storage.  Accidents of both types are
      preventable.  EPA believes that the large numbers of exposure incidents
      provide evidence that current policies for promoting bait protection have
      not been sufficient and, therefore, that tougher, more explicit policies are
      needed.  EPA has not been persuaded by contentions that the relatively
      low incidences of serious human illnesses caused by accidental exposures
      to compounds such as warfarin justify selective relaxations of
      requirements for  bait protection..."

      Risk to Household Pets

      As with human exposures, EPA is concerned about the increased risk posed to
non-target domestic animals to rodenticides  used in and around the home.  When
used as currently sold and marketed, rodenticides account for a high number of non-
target animal incidents and accidental exposures every year. PR Notice 94-7 stated
in part that:

      "Dog incidents account for more than 80% of the reported exposures of
     nontarget animals to commensal rodenticides. Most dog exposures are
     believed to be accidental.  The annual number of incidents of animals
     being exposed to rodenticides is not known,  but over 4,000 rodenticide-  '
     related inquiries were made to the Illinois Animal Poison information
     Center in each of the years from 1986  to 1988,  with a high  of 6,272
     inquiries having been made in  1987.

     Symptoms of rodenticide poisoning are detected more frequently in
     reported animal cases than in child cases. A larger percentage of
     asymptomatic exposures of animals may go undetected as pets and
     livestock generally are not watched as closely as children.  Dogs may die
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       as a result of rodenticide exposures, especially if acute poisons are
       involved.  Extended Vitamin Kl therapy may be needed for dogs that have
       beenexposedto certain anticoagulants, such as brodifacoum or
       diphacinone, which are retained in the, body for a relatively long time.
       For animal exposures reported in 1987 (and probably in other years as
       vcell), the animal', s owner typically was the source of the rodenticide.
       Most of these exposures were accidental and occurred in or around human
     j  residences."                            "                .

       In the recent past, poison control centers have enhanced their ability to capture
 incident data. This improved data collection indicates that the high number of human
 unintentional or accidental  exposures to rodenticides are not going down. From the
 number of exposures to children, it is clear that children younger than six years of
 age are at a disproportionately higher risk from the continued use of these products in
 and around the home.  Based on these findings and the additional information on risk
 to household pets, EPA is requiring the risk mitigation measures in the following
 discussion.

                 (3)   Accidental Residential Risk Mitigation

      The Agency is requiring several risk mitigation measures for zinc phosphide
 products. The Agency is requiring the identical risk mitigation measures  to the
 registrations of other rodenticide active ingredients such as warfarin and salts,
 difethialone, vitamin D-3, red squill, as well as those contained in the rodenticide
 cluster (brodifacoum, bromethalin, bromodiolone, chlorophacinone, diphacinone and
 salts, and pival and salts). As appropriate, these measures will also be required of
 registrations of new rodenticide active ingredients to be used in and around the home.

      To address the risk concerns posed from the use of rodenticide products and
 still maintain the benefits afforded, by their use, the Agency developed a two-phased
 approach minimizing exposure that is aimed particularly at protecting infants and
 children. The first phase is designed to address short-term measures that will aid in
 identifying  when an actual exposure has occurred, to lessen the degree of such an
.exposure and to monitor exposures.  The second phase will reduce the opportunity
 for exposures in the long term.  Ideally, the Agency would have preferred to impose
 measures to immediately reduce opportunities for exposure, however, it recognizes
 that technologies may not exist and may need to be developed while maintaining the
 efficacy of the product.  The Agency has developed the following phased approach to
 allow time for the development and testing of products that deliver bait and are
 packaged in such a way as to reduce exposure while maintaining sufficient efficacy.

     During Phase I the Agency will require all zinc phosphide, non-agricultural
 products and products covered by the rodenticide cluster to incorporate indicator dye
                                    45  ••:

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 (to help identify whether a child or pet has actually consumed the pesticide) and
 bittering agents into their formulations. The indicator dye and bittering agent must
 be incorporated into all zinc phosphide products, other than those used exclusively in
 agricultural settings.  During Phase II EPA will form a stakeholder group (including
 industry, states, various poison control centers, rodent control experts, the medical
 community-and other  interested parties) to develop additional means of significantly
 reducing exposures to children and pets.  It is the Agency's intent that, within nine
 months or less from the issuance of the RED, the stakeholder group will issue its
 recommendations.  Possible outcomes of this group include:  requiring all rodenticide
 baits used in residential settings to be placed in disposable, child-resistant bait
 stations  or equivalently protective mechanisms; development of an exhaustive
 educational and outreach program for consumers and enhanced training for certified
 applicators; tamper-resistant bait stations;  and  additional labeling improvements.

      Indicator Dye and Bittering Agent

      All registrants of rodenticides, other than those with products used exclusively
 at agricultural sites, must incorporate an indicator dye into their formulations.  The
 dye is intended to help identify whether a child or household pet has actually
 consumed a rodenticide by dying their mouth and/or hands a bright color. EPA
 believes the dye will play a critical role in identifying when an exposure has
 occurred, thereby helping to determine if treatment is required.  Typically, it is very
 difficult for parents and guardians of children and pet owners to discern whether an
 exposure or ingestion has actually occurred, which may lead to unnecessary treatment
 at a medical facility as a precautionary measure.  In turn, the Agency  believes this
 measure will also  enable parents and guardians of children and pet owners to seek
 medical or veterinarian attention sooner rather  than later and avoid a serious medical
 episode.

      All registrants of rodenticides, other than those with products used exclusively
 at agricultural sites, must incorporate a bittering agent into their formulations to
 make the bait unpalatable to humans and household pets. EPA believes that the
 bittering agent will cause some children to expel the bait if placed in the mouth. The
 Agency is fully aware  that children younger than one year old do not have fully
 formed taste buds  and  may not be fully protected by this measure.  However, this
 measure should prevent some exposures to children older than one year of age.
 Likewise, the EPA is also aware that this measure may not affect exposures to non-
 target household animals.

      The Agency  is aware that all mitigation measures required during Phase I may
not be feasible within the  8 month timeframe usually accorded by the RED process to
submit labeling changes.  While registrants will still be required to submit revised
labeling as detailed in  Section V within the 8 month timeframe, the Agency
                                    46

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  recognizes that the formulation changes required by the addition of the indicator dye
  and bittering agent may take longer. The Agency will work with registrants to
  establish a timeframe for the incorporation of the dye and bittering agent into
  rbdenticide products at a meeting or through other means, prior to the initial
  stakeholder meeting.  At such time, deadlines and submittal procedures for additional
  efficacy testing, if required, will also be addressed.

       Improved Labeling Requirements

       EPA is requiring a number of label revisions to rodenticides used in and
  around the home.  These requirements are set forth in Section V of this RED
  document and are in addition to those required by PR Notice 94-7 that have.already
  been implemented. The Agency is monitoring the outcome of the requirements in PR
  Notice 94-7 along  with the measures required in this RED document, to determine
  their .effectiveness  in reducing  the number of incidents and exposures to these
 pesticides.

      Annual  Submission of American Association of Poison Control Centers Data

      Under the authority of FIFRA section 3(c)(2)(B), the Agency is requiring
 registrants of zinc phosphide subject to this RED document, to submit to the Agency
 annual American Association of Poison Control Centers' (AAPCC) data.  The
 Agency is requiring AAPCC data for the years 1999 through 2009.  These data will
 enable the Agency  to determine whether the.imposed risk mitigation measures are
.reducing incidents/exposures to humans, particularly children. AAPCC data
 obtained by the Agency for 1995 and 1996 will serve  as baseline data.  Registrants
 are encouraged to share the cost of generating data, whenever appropriate.

      Stakeholders  Meeting          '.-''-.

      As mentioned above, EPA will initiate a stakeholder meeting to discuss long-
 term exposure reduction measures (Phase II) and to decide on specific timing and
 other issues associated with bait dyes, bittering agents, and the content of a special
 label warning to users of rodenticides that children are particularly vulnerable to
 ingestion of baits.  One such  warning could be a large, red stop sign symbol,
 followed by "Children at risk.  Use product only as specified on label." in large, bold
 lettering. As noted earlier, the stakeholder group may include rodenticide registrants
 (with zinc phosphide, rodenticide cluster, and new active ingredient products as well
 as those that may have previously undergone registration),  states, various poison
 control centers, rodent control experts, the medical community and other interested
 parties.  The first stakeholders meeting is expected to be held 120 days from the date
 of the issuance of this RED in Washington, DC. It is  the Agency's intent that,
                                    47

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  within nine months or less from the issuance of the RED, the stakeholder group will
  conclude with its recommendations.

            b.   Environmental/Ecological Effects

       Zinc phosphide has a high to very high primary toxicity to birds and small
  mammals. Field, pen and laboratory studies indicate that some birds.and mammals
  are likely to be poisoned when exposed directly to zinc phosphide. Because of the
  mode of action,  secondary poisoning is expected to be minimal. There is concern for
  primary exposure to non-targets from the field uses as well  as those uses in/around
  homes and buildings.  In an attempt to  minimize these exposures the Agency will be
  requiring that all field uses of zinc phosphide remain classified as  Restricted Use.
  Since data are not available to assess potential risks to aquatic organisms, these data
  are now required.

      The Agency is concerned about zinc phosphide's potential effects on non-target
 animals,  especially from the broadcast  use.   The Agency has determined that the
 adverse effects associated with this use are not unreasonable due to the benefits of
 broadcast applications of zinc phosphide. Many of the tracts of land that are treated
 with zinc phosphide are vast, making hand baiting infeasible.  The Agency also
 believes that limiting the broadcast uses may indirectly encourage  the use of other
 pesticides that are more hazardous to non-target animals than zinc  phosphide.  In
 addition,  the available data do not show that hand-baiting_will necessarily result in
 reduced exposure to non-target animals. Rather than  impose specific use restrictions
 at this time, the Agency will continue its evaluation of the risks associated with hand
 baiting versus broadcast applications and may impose additional data requirements  or
 label amendments at a later date.

      The major route of degradation of zinc phosphide is hydrolysis, which results in
 the formation of phosphine and zinc ions, common nutrients in soil.  Zinc phosphide
 and its residues do not appear to be persistent or mobile under most environmental
 conditions. When applied to dry soil environments, zinc phosphide may be
 moderately persistent.  Zinc phosphide and its degradation products appear to have a
 low potential for  ground water and surface water contamination.

           c.    Restricted Use Classification

      Based on its toxicity and use patterns, the Agency is maintaining Restricted Use
classification for all zinc phosphide products that are currently so classified.  This
includes all agricultural use and tracking powder products.
                                    48

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            d.    Endangered Species Statement

      The Agency has developed a program (the "Endangered Species Protection
 Program")  to identify pesticides whose use may cause adverse impacts on endangered
 and threatened species, and to implement mitigation measures that will eliminate"the
 adverse impacts. At present, the program is being implemented on an interim basis
 as described in a Federal Register notice (54 FR 27984-28008, July 3, 1989), and is
 providing information to pesticide users to help them protect these species on a
 voluntary basis.  As currently planned, the final program will call for label
 modifications referring to required limitations on pesticide uses, typically as depicted
 in county-specific bulletins or by other site-specific mechanisms as specified by state
 partners. A final program, which may be altered from the interim program, will be
 described in a future Federal Register notice.  The Agency is not imposing label x
 modifications through the RED.  Rather, any requirements for product use
 modifications will occur in the future under  the Endangered  Species Protection
 Program. ,

      Zinc phosphide has been subject to a formal consultation with the Fish and
 Wildlife Service, as noted in Section III. Additional consultation  with the Fish and
 Wildlife Service and/or the National Marine Fisheries Service may be necessary to
 determine if steps need to be taken to protect newly listed species  or from proposed
 new uses of these pesticides.

           e.    Occupational/Residential Labeling Rationale

      At this time, some products containing zinc phosphide are intended primarily
 for residential use and some are intended primarily for occupational use.  The
 Worker Protection Standard (WPS) does not cover pesticides applied for control of
 vertebrate pests such as rodents.  Therefore, all of the uses of zinc phosphide are
 NOT within the scope of WPS.         -

 1. Requirements for Handlers              .

      For each end-use product, personal protective equipment (PPE) and engineering
control requirements for pesticide handlers are set during reregistration as follows:

          Based on risks posed to handlers by the active ingredient, EPA may
          establish active-ingredient specific  (a.i. specific)  handler requirements
          for end-use products containing that active ingredient.  If such risks are
          minimal,  EPA may choose not to establish  a.i.  specific handler
          requirements.       -
                                    49

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            EPA establishes handler PPE requirements for most end-use products,
            based on each product's acute toxicity characteristics.

            If a.i. specific requirements have been established, they must be compared
            to the PPE specified for the end-use product. The more stringent choice
            for each type of PPE (i.e., body wear, hand protection, footwear,
            eyewear, etc.) must be placed on the label of the end-use product.
            Engineering controls  are considered more stringent than PPE
            requirements.

       For zinc phosphide products, EPA has  considered each distinct formulation and
 is establishing, in this document, formulation-specific personal protective equipment
 and engineering control requirements for pesticide handlers.

       (a) Occupational-Use Products

       The Agency has concerns about occupational handlers mixing/loading/applying
 zinc phosphide tracking powders, concentrates, wettable powders and bait
 formulations not sold in tamper-resistant bait stations.  EPA is concerned that such
 handlers may inhale fine particles or dusts that may  become airborne during the
 handling and that such handlers may ingest zinc phosphide as a result of hand to
 mouth transfer of dusts or residues or as a result of swallowing fine particles that
 may become airborne during handling activities.  For specific labeling requirements
 refer to Section V.

      (b) Homeowner-Use Products

      EPA is not establishing PPE requirements for homeowner handlers for zinc
 phosphide.  In general, the Agency does not consider PPE requirements for
 homeowners to be practical  or reliable risk-mitigation measures.

 2. Post-Application/Entry Restrictions

      EPA is not establishing post-application entry restrictions for any zinc
phosphide end-use products.

3. Other Labeling Requirements

     All products intended for use at residential sites must have label restrictions
limiting their use to either outdoor underground sites or in areas that are inaccessible
to children and pets.  ,
                                    50

-------
            The Agency is not requiring the same restrictions for uses of zinc phosphide in
      agricultural settings as for residential settings.  The Agency does not anticipate the
      same types of exposures to children and pets in the agricultural areas; therefore, the
      current label  restrictions are adequate and will be maintained.

            The Agency is also requiring other use and safety information to be placed on
      the labeling of all end-use  products containing zinc phosphide.  For the specific
      labeling statements> refer to Section V of this document.
V.     ACTIONS REQUIRED OF REGISTRANTS
                                                       f"          ,                •' ,     '
       This section specifies the data requirements and responses necessary for the
reregistration of both manufacturing-use and end-use products.

       A.     Manufacturing-Use Products

              1.     Additional Generic Data Requirements

              The generic data base supporting the reregistration of zinc phosphide for the
       eligible uses has been reviewed and determined to be substantially complete.  The
       following data gaps remain and data are still required:                        '

              61-, 62-and 63-series product chemistry data
              72-la         Acute Fish Toxicity (bluegill sunfish)1               '
              72-lc         Acute Fish Toxicity (rainbow trout)1           -'.'.,
              72-2          Acute Aquatic Invertebrate-Toxicity1                          .
              171-3         Directions for Use2
              171-4e    •   Storage Stability3
              171-4k      'Crop Field Trials4
           Required to support the broadcast applications.  The consortium must consult with EPA prior to
           initiating studies to ensure agreement on the appropriate test material and test protocols.

           Required to retain artichoke (globe), sugar beet tops, and sugar beet roots uses.  Proposed use
           directions must reflect the use patterns contained in the adequate residue data from the original
           tolerance petitions.                                                ,

           Data are required concerning the length and conditions of sample storage for grapes, rangeland grass
           forage and sugarcane. Dates of harvest and analysis are also required for sugarcane.

           Required for grapes, grass forage and sugarcane if samples in field trial studies were stored for longer
           than 30 days (grapes) or 6 months.(grass forage and sugarcane) prior to analysis.   .     ...'""

                                            51           '   -    :•        :    '

-------
        The Agency is also requiring zinc phosphide registrants, as well as
 registrants of other rodenticides, to submit annual American Association of Poison
 Control Centers (AAPCC) data. The Agency is requiring AAPCC data for the
 years 1999 through 2009, which must be submitted to the Agency within one-year
 after the end of the reporting year.  For example, 1999 AAPCC data must be
 submitted to the Agency on or before December 31, 2000. The American
 Association of Poison Control Centers is located at 3201 New Mexico Avenue,
 Suite 310, Washington, D.C. 20016.  They can be reached by telephone  on (202)
 362-7217 and by fax  on (202) 362-8377. The Agency encourages registrants to
 share the costs associated with data generation, whenever possible.

       2.     Labeling Requirements for Manufacturing-Use Products

       To remain in compliance with FIFRA, manufacturing use product (MP)
 labeling must be revised to comply with all current EPA regulations, PR  Notices
 and applicable policies.  The MP labeling must bear the labeling contained in the
 table at the end of this section.

 B.    End-Use Products

       1.     Formulation Changes

       All registrants of rodenticides must incorporate an Agency-approved
 indicator dye and bittering agent into their formulations. The Agency recognizes
 that the formulation changes required by the addition of the indicator dye and
 bittering agent may take longer than the eight months usually provided by the RED.
 The Agency will work with registrants to establish a timeframe for the
 incorporation of the dye and bittering agent into rodenticide products at a me'eting,
 or through other means, prior to the initial stakeholder meeting.  At such time,
 deadlines and submittal procedures for additional efficacy testing, if required, will
 also be addressed.

       2.    Stakeholder Meetings

       The Agency is  planning to hold the initial stakeholders meeting within 120
 days from the issuance of this RED in Washington, DC.  As mentioned earlier,
 these meetings will provide an open forum to develop workable mitigation measures
 to adequately protect children from accidental rodenticide exposures. For these
 meetings to be most efficient and successful, all interested parties  and viewpoints
 will be welcomed and considered. The outcomes of these meetings will effect all
 rodenticide products with residential uses, including those that were previously
reregistered and those that have been registered more recently and, hence, not
subject to reregistration.
                                  52

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       3.     Additional Product-Specific Data Requirements

       Section 4(g)(2)(B) of.FIFRA calls for the Agency to obtain any needed
product-specific data regarding the pesticide after a determination of eligibility has
been made. Registrants must review previous'data submissions to ensure that they
meet current EPA acceptance criteria and if not, commit to conduct new studies.  If
a registrant believes that previously submitted data meet current testing standards,
then study MRID numbers should be cited according to the instructions in the
Requirement Status and Registrants Response Form provided for each product.
       4.
Timeframes
       Phase One mitigation requirements include: (a) incorporating bittering  .
agents and dyes into all end-use formulations, (b) submitting revised labeling
reflecting revisions as discussed below.   The Agency recognizes that the
formulation changes required by the addition of the indicator dye and bittering agent
may take longer than the eight months usually provided by the RED. The Agency
will work with registrants to establish a time frame for the incorporation of the dye
and'bittering agent into rodenticide products at a meeting or through other means.
At the same time, deadlines and submittal procedures for additional efficacy testing,
if required, will also be addressed. The Agency expects these issues to be resolved
prior to the initial stakeholder's meeting. Revised labeling and other product-
specific data is due to the Agency within the regular 8-month time frame.

       5.     Labeling Requirements for End-Use Products
        i           ^                t                            ^  - •

       All end-use" pro ducts should have clear, concise and complete labeling
instructions. Proper labels can improve reader understanding, thereby reducing
misuse and the potential for incidents. Towards this end, the Agency is requiring
the following:

       Directions for Use:

       Directions for Use must be stated in terms that can be easily read and
understood by the average person likely to use or to supervise the use of the
pesticide.   It must be presented in a format that is easy to understand and follow.
                                   53

-------
 The Directions for Use section of a pesticide label must provide the necessary
 information to answer four major categories regarding the use of the pesticide.
 These four questions are:

       1)     Why is the pesticide being used?  For what pest(s) or problem?
       2)     Where is the pesticide applied?  (Where should it not be applied?)
       3)     How is the pesticide applied (what special precautions  must the user
              take? how much should they use?)
       4)     When should the pesticide be applied?

       In addition, the Agency encourages the use of graphic symbols whenever
 possible, to clarify the written label.

       National Pesticide Telecommunications (NPTN) Hotline Number

       All zinc phosphide labels  must refer consumers to the NPTN number for
 additional information. This reference must bear the labeling contained in the table
 at the end-of this section.

       First Aid (Statement of Practical Treatment)

       The Agency is requiring that all labels  with Statement of Practical Treatment
 sections  be amended so that these sections are entitled, "First Aid."  First aid
 statements must be brief, clear, simple  and in straightforward language (conforming
 to the labeling required by the Agency) so that the average person can easily and
 quickly understand the instructions. These statements should be appropriate for all
 ages or,  when necessary, should  include distinctions between the treatments for
 different ages.

       PR Notice 94-7

       All end-use products intended for use in residential settings must include the
 labeling  language as outlined in PR Notice 94-7. When the label requirements
 imposed  by this RED,  or those imposed-by PR Notice 94-7,  are redundant or
 inconsistent with currently accepted labels those conflicts should be resolved in
 consultation with the Agency.

       (1) Formulation Specific PPE Requirements for this Active Ingredient:

       The Agency is establishing formulation-specific PPE  for all occupational
uses of zinc phosphide end-use products.  Remove any conflicting PPE
 requirements on the current labeling by eliminating the less stringent requirement.
                                   54

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       (2)  Placement in Labeling

       The personal protective equipment requirements must be placed on the end-
use product labeling in the section titled:, "Hazards to Humans (and domestic
animals)" immediately .following the precautionary statements. The exact language
listed in the table at the end of this section must be used.

             a.    Products Intended for Use on Field Crops, Orchards or
                   Vineyards

             Products labeled for all brbp uses regarded as non-food uses because
       of application methods and timing of applications must include all .
       restrictions, rates, etc. as outlined in the labeling table below.  All State and
       Local Needs products must contain specific information regarding use sites
       and use directions to help avoid inappropriate7 use of these products.

C.     Required Labeling Changes Summary Table

       The following table summarizes the labeling requirements being imposed by
this RED for all zinc phosphide products. Any use instructions on current labels
that conflict with the below should be removed.
                                  55

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D.    Existing Stocks
                                             «    ,          '
       Registrants may generally distribute and sell products bearing old
labels/labeling for 26 months from the date of the issuance of this Reregistration
Eligibility Decision (RED).  Persons other than the registrant may generally
distribute or sell such products for 50 months from the date of the issuance of this
RED.  However, existing stocks time frames will be established case-by-case,
depending on the number of products involved, the number of label changes, and
other factors.  Refer to "Existing Stocks of Pesticide Products; Statement of
Policy"; Federal Register, Volume 56, No. 123, June 26, 1991.

       The Agency has determined that registrants may distribute and sell zinc
phosphide products bearing old labels/labeling for 26 months from the date of •
issuance of this RED.  Persons other than the  registrant may distribute or sell such
products for 50 months from the date of the issuance of this RED.  Registrants and
persons other than registrants remain obligated to meet pre-existing Agency
imposed label changes and existing stocks requirements,applicable to products they
sell or  distribute.

-------
62

-------
VI. APPENDICES
       63

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PRD Report Date: 07/02/96
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                               GUIDE TO APPENDIX B
 Appendix B contains listings of data requirements which support the registration for active
 ingredients within the case Zinc phosphide covered by this Reregistration Eligibility Decision
 Document. It contains generic data requirements that apply to Zinc phosphide in all products,
 including data requirements for which a "typical formulation" is the test substance.

        The data table is organized in the following format:

        1.  Data Requirement (Column  1).  The data requirements  are listed in the order in
 which they appear in 40 CFR Part  158.  the reference numbers accompanying each test refer
,to the test protocols set in the Pesticide Assessment Guidelines, which are available from the
 National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161 (703)
 487-4650.

        2. Use Pattern (Column 2). This column indicates the use patterns for which the  data
requirements  apply.  The following letter designations are used for the given use patterns:

                           A     Terrestrial food
                           B     Terrestrial feed
                  ,  -       C     Terrestrial non-food
                           D     Aquatic food
                           E     Aquatic non-food outdoor
                           F      Aquatic non-food industrial
                           G     Aquatic non-food residential
                           H     Greenhouse food
                           I      Greenhouse non-food                            -
                           J      Forestry
                           K      Residential                    ••.'-,.
                           L      Indoor food
                           M     Indoor non-food
                           N      Indoor medical
                           O      Indoor residential

       3.  Bibliographic citation (Column 3).  If the  Agency has acceptable data in its files,
this column lists the identifying number of each study.  This normally is  the Master Record
Identification  (MRID) number, but may be a  "GS"  number if no MRID number has been-
assigned.  Refer to the Bibliography appendix for a complete citation of the study.
                                         119

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                       GUIDE TO APPENDIX C

CONTENTS OF BIBLIOGRAPHY. This bibliography contains citations of all
studies considered relevant by EPA in arriving at the positions and conclusions
stated elsewhere in the Reregistration Eligibility Document.  Primary sources for
studies in this bibliography have been the body  of data submitted to EPA and its
predecessor agencies in support of past regulatory decisions.  Selections from other
sources including the published literature, in those instances where they have been
considered, are included.

UNITS OF ENTRY,  The unit of entry in this bibliography is called a "study".  In
the case of published materials, this corresponds closely to an article.  In the case of
unpublished materials submitted to the Agency, the  Agency has sought to identify
documents at a level parallel to the published article from within the typically  larger
volumes in which they were submitted.. The resulting "studies" generally have a
distinct title (or at least a single subject), can stand alone for purposes of review and
can be described with a conventional bibliographic citation.  The Agency has also
attempted to unite basic documents and commentaries upon them, treating them as a
single study.

IDENTIFICATION OF ENTRIES;  The entries in this bibliography are sorted
numerically by Master Record Identifier, or "MRID number". This number is    ,
unique to the citation, and should be used whenever a specific reference is required.
It is not related to the six-digit "Accession Number" which has been used to identify
volumes of submitted studies (see paragraph 4(d)(4) below for further explanation).
In a few cases, entries added to the bibliography late in the review may be preceded
by a nine character temporary  identifier.  These entries are listed after all MRID
entries.  This temporary identifying number is also  to be used whenever specific
reference is needed.

FORM OF ENTRY.  In addition to the Master Record Identifier (MRID), each
entry consists of a citation containing standard  elements followed, in the case  of
material submitted to EPA, by a description of the earliest known submission.
Bibliographic conventions used reflect the standard of the American National
Standards Institute (ANSI), expanded to provide for certain special needs.

a     Author.  Whenever the author could confidently be identified, the Agency
       has chosen to show a personal author.  When no individual was identified,
       the Agency has shown an identifiable labora'tory or testing facility as the
        author. When no author or laboratory could be identified, the Agency has
        shown the first submitter as the author.
                                   131

-------
Document date.  The date of the study is taken directly from the document.
When the date is followed by a question mark, the bibliographer has deduced
the date from the evidence contained in the document.  When the date
appears as (19??), the Agency was unable  to determine or estimate the date
of the document.                     ,

Title. In some cases, it has been necessary for the Agency bibliographers to
create or enhance a document title.  Any such editorial insertions are
contained between square brackets.

Trailing parentheses. For studies submitted to the Agency in the past, the
trailing parentheses include (in addition to any self-explanatory text) the
following elements describing the earliest known submission:

(1)   Submission date.  The date of the earliest known submission appears
      immediately following the word "received."

(2)   Administrative number. The next element immediately following the
      word "under" is the registration number, experimental use permit
      number, petition number, or other administrative number associated
      with the earliest known submission,

(3)   Submitter. The third element is the submitter.  When authorship is
      defaulted to the submitter, this element is omitted.

(4)   Volume Identification (Accession Numbers).  The final element in the
      trailing parentheses  identifies the EPA accession number of the
      volume in which the original submission of the study appears. The
      six-digit accession number follows the symbol "CDL," which stands
      for "Company Data Library."  This accession number is in turn
      followed by an alphabetic suffix which shows the relative position of
      the study within the volume.                    .
                           132

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                               BIBLIOGRAPHY
 MRID
CITATION
 00005918   Hegdal, P.L.; Gatz, T.A.; (1977) Hazards to Pheasants and Cottontail
             Rabbits Associated with Zinc phosphide Baiting for Microtine Rodents in
             Orchards.  (Unpublished study received Jan 31, 1978 under 12455-17;
             prepared by U.S. Fish and wildlife Service, Denver Wildlife Research
             Center, submitted by Bell Laboratories, Madison, Wis.; CDL:232996-A)

00005921    Hawaii.  Department of Agriculture (1970?) Preparation of Pure Phosphine
             Gas and Notes on the Analysis of Phosphine in Closed Systems.  Undated
             method. (Unpublished study received Mar 3, 1971 under OF0890;
             CDL:093187-D)

00005922    Robinson, W.H.; Hilton, H;W.; Mee, J.; Uyehara, G. (1968) Methodology:
             Determination of Phosphine Residues in Sugarcane and Related Sugar
             Products from the Use of Zinc phosphide.  Includes undated method.
             (Unpublished study received Sep 25,  1969 under OF0890; prepared by U.S.
             Fish and Wildlife Service, Denver Wildlife Research Center, Section of
             Chemical Research and Analytical Activities in cooperation with Hawaiian
             Sugar Planters' Association, Experiment Station, submitted by Hawaii,
             Dept. of Agriculture, Honolulu, Hawaii; CDL:093187-F)

00005923    Hawaii. Department of Agriculture (1969) Laboratory Evaluation of Zinc
             phosphide Toxicity and Bait Formulations.   (Unpublished study received Sep
             25,  1969 under OF0890; CDL:093187-H)                               -

00005924    Hawaii, Department of Agriculture (1966?)  Physical and Chemical
             Properties of Technical Zinc phosphide. Summary of studies 093187-V and
             093187-Z through 093187-AB. (Unpublished study received Sep 25, 1969,
             under OF0890; CDL:093187-I)

00005925    Hawaii. Department of Agriculture (19??) Residue Reduction in Phosphine
             and  Zinc phosphide.  (Unpublished study received Sep 25, 1969 under
             OF0890; CDL:093187-J)

00005926    U.S. Fish and Wildlife Service, Denver Wildlife Research Center (1969)
             Rate of Hydrolysis of Zinc phosphide.  (Unpublished study including
             comments by W.H. Robinson, received Sep 25, 1969 under OF0890;
             submitted by Hawaii, Dept. of Agriculture,  Honolulu, Hawaii;
             CDL:093187-K)
                                       133

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                               BIBLIOGRAPHY
MRID
CITATION
00005927    National Pest Control Association (1967) Technical Release: Zinc
             phosphide: No. 17-67.  (Unpublished study received Sep 25, 1969 under
             OF0890; submitted by Hawaii, Dept. of Agriculture, Honolulu, Hawaii;
             CDL:093187-M)

00005928    Association of American Pesticide Control Officials, Incorporated (1966)
             Pesticide Chemicals Official Compendium,  (pp. 1242-1243 only; available
             from: The Treasurer, Robert H. Guntert, Director, Control Div., Kansas
             State Board of Agriculture, 1032-S State Office Building, Topeka, Ks
             66606; unpublished study received Sep 25, 1969 under OF0890; submitted
             by Hawaii, Dept.  of Agriculture, Honolulu, Hawaii; CDL:093187-O)

00005929    Van Wazer, J.R. (1958) Elemental phosphorus and the metal phosphides.
             Pages 122-177,InPhosphorus and Its Compounds: Volume I. By author.
             New York: N.Y. Interscience Publishers.  (Also In unpublished submission
             received Sep 25, 1969 under OF0890; submitted by Hawaii, Dept. of
             Agriculture, Honolulu,  Hawaii; CDL:093187-P)

00005930    Van Wazer, J.R. (1958) Hydrides, halides, and pseudohalides of phosphorus
             and their organic derivatives. Pages 179-219,In Phosphorus and Its
             Compounds: Volume 1.  By author.   New York: N.Y. Interscience
             Publishers. (Also In unpublished submission received Sep 25,  1969  under .
             OF0890; submitted by Hawaii, Dept. of Agriculture, Honolulu, Hawaii;
             CDL:093187-Q)

00005931    Hilton, H.W. (1966) Pesticides and food additives in sugarcane and  sugar
             products. Pages l-30,InResidue Reviews: Volume 15. Edited by F.A.
             Gunther.  New York: Springer-Verlag. (Alsoln unpublished submission
             received Sep 25, 1969 under OF0890; .submitted by Hawaii, Dept. of
             Agriculture, Honolulu,  Hawaii; CDL:093187-R)

00005932    U.S. Fish and Wildlife Service (1959) Characteristics of Common
             Rodenticides.  Rev.  Washington, D.C.: U.S. Dept. of Interior. (Wildlife
             leaflet 337; alsolnunpublished submission  received Sep 25, 1969 under
             OF0890; submitted by Hawaii, Dept. of Agriculture, Honolulu, Hawaii;
             CDL:093187-S)
                                       134

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                               BIBLIOGRAPHY
MRID
CITATION
00005933    Syracuse, M.G. (1965?) Zinc phosphide: Phbsphine.  (Unpublished study
            received Sep 25, 1969 under OF0890; submitted by Hawaii, Dept. of
            Agriculture, Honolulu, Hawaii; CDL:093187-T)

00005936    Robison, W.H. (1969) Determination of Phosphine Residue from Sugar
            Cane.  Method dated Jul 24, 1969.  (Unpublished study received Sep 25,
            1969 under OF0890; prepared by U.S. Fish and Wildlife Service, Denver
       '     Wildlife Research Center, submitted by Hawaii, Dept. of Agriculture,
            Honolulu, Hawaii; CDL:093187-X)           '  }    .

00005938    Hayne, D.W. (1951) Zinc phosphide: Its toxicity to pheasants and effect of.
            weathering upon its toxicity to mice: Michigan Agricultural Experiment
            Station Quarterly Bulletin 33(4):412-425. (Alsoln unpublished submission
            received Sep 25, 1969.under OF0890; submitted by Hawaii, Dept. of
            Agriculture, Honolulu, Hawaii; CDL:093187-AA)

00005939    Elmore, J.W.; Roth, F.J.  (1943) Analysis and stability of Zinc phosphide.
            Journal of the Association of Official Agricultural Chemists
            XXVI(4):559-564. (Alsoln unpublished submission received Sep 25,  1969
            under OF0890; submitted by Hawaii, Dept. of Agriculture, Honolulu,
            Hawaii; CDL:093187-AB)

00005940    Hawaii. Department of Agriculture (1965?) Residue Data for Zinc phosphide
            and Phosphine. (Unpublished study received Sep 25,  1969 under OF0890;
            CDL:093187-AD)

00005941    National Pest Control Association (1968).Technical Release: Research
            Report on the Stability of Zinc phosphide: No. 14-68. (Unpublished study
            received Sep 25, 1969 under OF0890; submitted by Hawaii, Dept. of
            Agriculture, Honolulu, Hawaii; CDL: 093187-AE)

 00005947   Hawaii. Department of Agriculture (1967) Toxicity of Zinc phosphide.
            (Unpublished study received Mar 3, 1971 under OF0890; prepared in
            cooperation with U.S. Fish and Wildlife Service, Denver Wildlife Research
           " Center; CDL:093186-E)

00005948    Robison, W.H. (1969) Results of Residue Analysis of Sugarcane for
            Phosphine. (Unpublished study received Mar 3, .1971 under OF0890;

                                       135

-------
                                BIBLIOGRAPHY
 MRID
CITATION
             prepared by U.S. Fish and Wildlife Service, submitted by Hawaii, Dept. of
             Agriculture, Honolulu, Hawaii; CDL:093186-G)

00005949    Hawaii. Department of Agriculture (1969) Studies with Radioactive
             Phosphine-Has3->32P.  (Unpublished study received Mar 3, 1971 under
             OF0890; CDL:093186-H)

00005950    U.S. Fish and Wildlife Service (1972) Control of Black-Tailed Prairie Dogs
             in the Western United States: Problem Analysis. Summary of studies
             091945-D through 091945-R.  (Unpublished study received Apr 15, 1974
             under 4F1494; submitted by U.S. Dept. of Interior, Fish and Wildlife
             Service, Washington,  D.C.; CDL:091945-A)

00005951    U.S. Fish and Wildlife Service (1952?) Laboratory Evaluations of Zinc
             phosphide. (Unpublished study received Apr 15, 1974 under 4F1494;
             submitted by U.S. Dept. of Interior, Fish and Wildlife Service, Washington,
             D.C.; CDL:091945-B)

00005952    U.S. Fish and Wildlife Service (1973) Field Evaluations of Zinc phosphide.
             (Unpublished study received Apr 15, 1974 under 4F1494; submitted by U.S.
             Dept. of Interior, Fish and Wildlife Service, Washington, D.C.;
             CDL:091945-C)

00005962    U.S. Fish and Wildlife Service (1974) Black-Tailed Prairie Dog: Occurence
             and Range.  (Unpublished study received on unknown date under 4F1494;
             submitted by U.S. Dept. of Interior, Fish and Wildlife Service, Washington,
             D.C.; CDL:093969-A)

00005965    Lewis, J.C.; Hassien,  F. (1973) Status of Prairie Dogs and Surveys for
             Black-Footed Ferrets in Oklahoma.  (Unpublished study received on
             unknown date under 4F1494; prepared by Oklahoma, Cooperative  Wildlife
             Research Unit, submitted by U.S. Dept. of Interior, Fish and Wildlife
             Service, Washington, D.C.; CDL: 093969-H)

00005968    Scheelhaase,  C.G. (1972) Status of the Prairie Dog in Saskatchewan.
             (Unpublished study received on unknown date under  4F1494; prepared by
             Saskatchewan, Dept. of Natural Resources,  submitted by  U.S.  Dept.  of
             Interior, Fish and Wildlife Service, Washington, D.C.; CDL:093969-M)
                                       136

-------
                               BIBLIOGRAPHY
MRID
CITATION
00005969    Van Ballenberghe, V.; Berryman, J.H.; Johnson, N.G. (1973) Ferret and
             Prarie Dog Programs on Public Lands. (Unpublished study received on
             unknown date under 4F1494; prepared by Div. of Wildlife Services, Branch
             of Animal Damage Control, in cooperation with South Dakota State Univ.,
             submitted by U.S. Dept. of Interior, Fish and Wildlife Service, Washington,
             D.C.; CDL: 093969-N)

00005970    Robinson, L.D. (1969?) Black-Footed Ferret and Prairie Dog Programs on
             Forest Service Administered Lands. (Unpublished study received on
             unknown date under 4F1494; prepared by U.S. Forest Service, Nebraska
             National Forest, submitted by U.S. Dept. of Interior, Fish and Wildlife
             Service, Washington, D.C.; CDL: 093969-O)        , .  .
      (              -                       '      t                       _
00005999    Stephenson, J.B.P. (1967) Zinc phosphide poisoning. Archives of
             Environmental Health 15(?/Jul):83-88. (Also In unpublished submission  ,
             received Apr 23,  1976 under 6704-78; submitted .by U.S. Dept. of Interior,
             Fish and Wildlife Service, Washington, D.C.; CDL:224029-B)

00006025    U.S..Fish and Wildlife Service (1977) A Zinc phosphide Dietary LC50
             Study against Bobwhite Quail and Mallard Ducks. (Unpublished study
         -   received Jul 15,  1977 under 6704-78; submitted by U.S. Dept. of Interior,
           '  Fish and Wildlife Service, Washington, D.C.; CDL:230884-A)
                      •'   -              '   .        •  .            •    ' \  •  •    .   •
00006028    Piccirillo, V.J.  (1977) Final Report: Acute Eye Irritation Potential Study in
             Rabbits: Project No.  419-134. (Unpublished study received Apr 12, 1977
             under 6704-78; prepared by Hazleton Laboratories America, Inc., submitted
  .  . •   /    by U.S. Dept. of Interior, Fish and Wildlife Service,  Washington, D.C.;
             CDL:229306-B)             ,

00006029    Piccirillo, V.J.  (1977) Final Report: Primary Skin Irritation Study in
             Rabbits: Project No.  419-134. (Unpublished study received Apr 12, 1977
             under 6704-78; prepared by Hazleton Laboratories America, Inc., submitted
             by U.S. Dept. of Interior, Fish and Wildlife Service,  Washington, D.C.;
             CDL-229306-C)
                                       137

-------
                                        BIBLIOGRAPHY
         MRID
                               CITATION
\
 00006030   Piccirillo, V.J. (1977) Final Report: Acute Dermal Toxicity Study in
             Rabbits: Project No. 419-134.  (Unpublished study received Apr 12, 1977
             under 6704-78; prepared by Hazleton Laboratories America, Inc.,  submitted
             by U.S. Dept. of Interior, Fish and Wildlife Service, Washington, D.C.;
             CDL:229306-D)

00006031    Matschke, G.H. (1978) A Zinc phosphide Dietary LC50 Study against
             Bobwhite Quail. (Unpublished study received Mar 28, 1978 under 6704-78;
             submitted by U.S. Dept. of Interior, Fish and Wildlife Service, Washington,
             D.C.; CDL:233339-A)

00006032    Matschke, G.H.; Higgins, W.H. (1978) Adult Bobwhite Quail LD50 and 95
             Percent Confidence Limits.  (Unpublished study received Mar 15,  1978
             under 6704-78; submitted by U.S.  Dept. of Interior, Fish and  Wildlife
             Service, Washington, D.C.; CDL:233244-A)

00006033    Matschke, G.H.; Higgins, W.H. (1978) Adult Mallard Duck LD50 and 95
             Percent Confidence Limits.  (Unpublished study received Mar 15,  1978
             under 6704-78; submitted by U.S.  Dept. of Interior, Fish and  Wildlife
             Service, Washington, D.C.; CDL:233243-A)

 00006044   Lisk, D.J.; Smith,  W.G.; Gutenmann, W. (1973) Phosphine Residues in
             Grapes  Resulting from Vineyard Treatment with Zinc phosphide.
             (Unpublished study including letter dated Jul 11, 1974 from D.J. Lisk to
             Richard Guest, received Sep 20, 1974 under 5E1551; prepared by Cornell
             Univ., Food Science Dept., Pesticide Residue Laboratory;  submitted by
             Interregional Research Project No. 4, New Brunswick, N.J.;
             CDL:094602-C)

00006045    Dewey, I.E. (1974) 2% Zinc phosphide-Treated Cracked Corn for  Mouse
             Control in Vineyards. (Unpublished study including letter  dated Oct 18,
             1972 from I.E. Dewey to Charlie C. Compton, received Sep 20, 1974 under
             5E1551; prepared by Cornell Univ., Cooperative Extension,
             Chemicals-Pesticides Programs, submitted by Interregional Research Project
             No. 4, New Brunswick, N.J.; CDL: 094602-D)
                                               138

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                               BIBLIOGRAPHY
MRID
                   CITATION
00006047
00006058
00019919
00029247
 00068028
 00082533
 00082535
 Hilton, H.W.; Pank, L.F.; Teshima, A.H. (1972) Progress Report on Two
 Years of Rat Control with Zinc phosphide Bait.  (Technical supplement to
.insect and rat control report 24; unpublished study received Apr 16, 1973
 under 10646-1; submitted by Hawaii, Dept. of Agriculture, Honolulu,
 Hawaii; CDL:005036-B)

 Hilton, H.W.; Robison, W.H.; Teshima, A.H. (1971) Fate of Zinc
 Phosphide and Phosphine in or near Sugarcane Fields.  Includes undated
 method.  (Unpublished study including 22 letters dated Jul 19, 1968 from
 H.W. Hilton to Plantation Agriculturalists, received Mar 3, 1971 under
 OF0890; prepared by Hawaiian Sugar Planters' Association in cooperation
 with U.S. Dept. of Interior, Denver Wildlife Research Center,  submitted by
 Hawaii, Dept. of Agriculture, Honolulu, Hawaii; CDL:093187-A)

 Hawaii. Department of Agriculture (1963) Zinc Phosphide-Data Sheet No.
 809.  (Unpublished study received Sep 25, 1969 under OF0890;
 CDL:093187-L)

 Piccirillo, V.J. (1977) Final Report: Acute Eye Irritation Potential Study in
 Rabbits: Project No. 419-134. (Unpublished study received Jan 7, 1980
 under 12455-24;  prepared by Hazleton Laboratories America, Inc.,
 submitted by Bell Laboratories, Madison, Wis.; CDL:241618-C)

 Hilton, H.W.; Robison, W.H. (1972) Fate of zinc phosphide and phosphine
 in the soil-water  environment. Journal of Agricultural and Food Chemistry
 20(6): 1209-1214. (Also In unpublished submission received May 8, 1981
 under HI 80/9; submitted by state of Hawaii for an unknown registrant;
 CDL-.245041-C)

 Hooker Chemical Company (1963) Zinc Phosphide: Data Sheet No.  809.
 (Unpublished study received May 10, 1974 under 4F1494; submitted by
 U.S. Fish and Wildlife Service, Washington, D.C.; CDL: 093967-E)

 National Pest Control Association (1967) Zinc Phosphide.  Elizabeth, N.J.:
 NPCA.  (Technical release no. 17-67; alsolnunpublished submission
 received May 10, 1974 under 4F1494; submitted by U.S.  Fish and Wildlife
 Service,  Washington, D. C.; CDL: 093967-H)
                                        139

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                               BIBLIOGRAPHY
 MRID
CITATION
 00082538    Syracuse, M.G. (1965) Zinc Phosphide (Phosphine). (Unpublished study
             received May 10, 1974 under 4F1494; submitted by U.S. Fish and Wildlife
             Service, Washington, D.C.; CDL:093967-L)

 00082540    Brock, E.M. (1965) Toxicological feeding trials to evaluate the hazard of
             secondary poisoning to gopher snakes (Pituophincatenifer).  Copeia
             2:244-245.  (Also In unpublished submission received May  10, 1974 under
             4F1494; submitted by U.S. Fish and Wildlife Service, Washington, D.C.;
             CDL:093967-N)

 00082541    Chitty, D., ed. (1954) Control of Rats and Mice: Volume 1. ?: Oxford
             Univ. Press.  (Pages  102,106-108 only; alsolnunpublished submission
             received May 10, 1974 under 4F1494; submitted by U.S. Fish and Wildlife
             Service, Washington, D.C.; CDL: 093967-O)

00082542    Doty, R.E. (1945) Rat control on Hawaiian sugar-cane plantations. Hawaiian
             Planters' Record 49(2):71-239; Taken from: Chemical Abstracts
             40:1276-1277.  (Also In unpublished submission received May 10, 1974
             under 4F1494; submitted by U.S. Fish and Wildlife Service, Washington,
             D.C.; CDL:093967-P)    '

00082550    Schoof, H.F. (1970) Zinc phosphide as a rodenticide. Pest Control
             ?(May):38,42-44. (Also In unpublished submission received May 10, 1974
             under 4F1494; submitted by U.S. Fish and Wildlife Service, Washington,
             D.C.; CDL:093967-AC)

00082553    Hilton, H.W.; Robison, W.H.; Teshima, A.H.; et al. (1972) Zinc phosphide
             as a rodenticide for rats in Hawaiian sugarcane. Pages
             561-570,InProceedings, 14th Congress, International Society of Sugar Cane
             Technologists; Nov 1971, New Orleans, Louisiana.  By? N.P.
             (Alsolnunpublished submission received May 10, 1974 under 4F1494;
             submitted by  U.S. Fish and Wildlife Service, Washington, D.C.;
             CDL:093967-AP)
                                       140

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                               BIBLIOGRAPHY
MRID
CITATION
 00085366    Ashton, A.D.; Jackson, W.B. (1981) Letter sent to George Miller dated Jul
             27, 1981: Acute oral LD50 testing with zinc phosphide (4966-78-C):
             Preliminary draft.  (Unpublished study receive'd Aug 11, 1981 under 935-28;
             prepared by Bowling Green State Univ., Center for Environmental Research
             and Services, submitted by Hooker Chemical & Plastics Corp., Niagara
             Falls, N.Y.;'CDL:245763-C)

00151407    Hill, E.; Carpenter, J. (1982) Responses of Siberian ferrets to secondary
             zinc phosphide poisoning.  J. Wildl. Manage.-46(3):  678-685.

05007610    Okuno, I.; Wilson, R.A.; White,  R.E. (1975) Determination of zinc
             phosphide in range vegetation by gas chromatography.  Bulletin of
             Environmental Contamination and Toxicology 13(4);392-396.

05007787    Hilton, H.W.; Mee, J.M.L. (1972) Studies with radioactive
          ;   phosphine-->32P in sugarcane.  Journal of Agricultural and Food Chemistry
             20(2):334-336.

40962501    Markle, G. (1988) Zinc Phosphide Magnitude of Residue on Artichoke: IR-4
             PR 1765.  Unpublished compilation prepared by Univ.  of California, Davis,
             IR-4 Western Region Analytical Laboratory. 23 p.

41035001    Biehn, W. (1989) Zinc Phosphide: .Magnitude of Residue on Sugar Beet:
             Project ID: IR-4 PR No. 1734. Unpublished study prepared by IR-4
             Western Region Analytical Laboratory.  26, p.

41507401    Matschke, G.; Andrews, K.  (1990) Zinc Phosphide:  Black-Tailed Prairie
             Dog—Domestics Ferret Secondary Poisoning Study: Lab Project Number:
             902:1 -33. Unpublished study prepared by Denver Wildlife Research Center,
             80 p.

42306201    Johnson, G. (1992) Primary  and Secondary Hazards of Zinc Phosphide to
             Nontarget Wildlife: A Review of the Literature: Lab Project Number:
             QA-245. Unpublished study prepared by Western Ecosystems Technology,
             Inc.  67 p.
                                        141

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                               BIBLIOGRAPHY
 MRID
CITATION
 42986201   Asar, N. (1991) Zinc Phosphide Technical-(Ratol): Product Chemistry: Lab
             Project Number: A: ZNP: 1: 91.  Unpublished study prepared by United
             Phosphorus Limited. 23 p.

 42986202    Asar, N. (1991) Product Chemistry on Zinc Phosphide--Ratol: Physical and
             Chemical Characteristics: Lab Project Number: UPL: EPA: ZNP: 91.
             Unpublished study prepared by United Phosphorus Limited.  10 p.

 42987301    San, R.; Wyman, M. (1993) Zinc Phosphide (Technical):
             Salmonella/Mammalian-Microsome Plate Incorporation Mutagenicity Assay
             (Ames Test): (Final Report): Lab Project Number: TD102.501: QA-273:
             SPGT501.  Unpublished study prepared by Microbiological Associates, Inc.
             40 p.

 42987302    Bigger, C.; Clarke,  J. (1993) Zinc Phosphide (Technical): L5178Y
             TK+/-Mouse Lymphoma Mutagenesis Assay: (Final Report): Lab Project
             Number: TD102.701: QA-274: SPGT701.  Unpublished study prepared by
             Microbiological Associates,  Inc.  36 p.

 42987303    Putman, D.; Curry,  P. (1993) Zinc Phosphide (Technical): Micronucleus
             Cytogenetic Assay in Mice:  (Final Report): Lab Project Number:
             TD102.122: QA-275: SPGT122. Unpublished study prepared by
             Microbiological Associates,  Inc.  28 p.

 43083501    Henwood, S. (1994) Developmental Toxicity Study with Zinc Phosphide in
             Rats: Final Report: Lab Project Number: HWI 6451-100: QA-272.
             Unpublished study prepared  by Hazleton Wisconsin, Inc.  224 p.

43125501    Riekena, C. (1994) Series 61: Product Identity and Composition of
             Technical Zinc Phosphide: Lab Project Number: BEL/0294/C140.
             Unpublished study prepared  by Bell Lab., Inc. 10 p.

43125502    Riekena, C. (1994) Series 62: Analysis and Certification of Product
             Ingredients of Technical Zinc Phosphide: Lab Project Number:
             BEL/0294/C140.  Unpublished study prepared by Bell Lab., Inc. 30 p.
                                      142'

-------
                               BIBLIOGRAPHY
MRID
CITATION
43284301    Schaefer, G. (1994) Acute Neurotoxicity Study with Zinc Phosphide in Rats:
            Lab Project Number: IRDG: 711/002., Unpublished study prepared by
            IRDC. 742 p.      -

43436601    Siglin, J. (1994) A 9.1 -Day Oral Toxicity Study in Rats with Zinc Phosphate
            Technical: Final Report: Lab Project Numbers: 3294.1: QA-276: DWRC
            QA-276. Unpublished study prepared by Springborn Labs, Inc. 528 p.
                                                        /    ~     , •     -
43452401    Asar, N. (1994) Zinc Phosphide Technical--(Ratol):  Product Chemistry: Lab
            Project Number: A/ZNP/2/94. Unpublished study prepared by United
            Phosphorus Ltd. 10 p.

43452402    Asar, N. (1994) Product Chemistry on Zinc Phosphide-Ratol: Lab Project
            Number: UPL/EPA/ZNP/94. Unpublished study prepared by United
            Phosphorus Ltd. 11 p.

43466302    Timm, R. (1994) Zinc Phosphide Technical: Environmental Fate--A Review
            of the Literature.  Unpublished study prepared by Denver Wildlife Research
            Center. 38 p.

43466303    Timm, R. (1994) Zinc Phosphide Technical: Environmental Fate~A Review
            of the Literature.  Unpublished study prepared by Denver Wildlife Research
            Center. 19 p.
43549801    Asar, N. (1994) Product Chemistry on Zinc Phosphide--(RATOL): Lab
            Project Number; UPL:EPA:ZNP:1994. Unpublished study prepared by
            United Phosphorus Ltd. 14 p.

43586602    Ramey, C.; Sterner, R.; Wolff, J.; et al. (1995) Observed Nontarget
            Hazards to Ring-Necked Pheasants and California Quail of Broadcasting a
      ,     2 % Zinc Phosphide Oat Groats Bait for Control of Gray-Tailed Voles in
            (QA-332): Lab Project Numbers: QA-332: 332.  Unpublished study prepared
            by Denver Wildlife Research Center.  515 p.

43903801    Schaefer, G. (1995) 13-Week Subchronic Neurotoxicity Study in Rats: Zinc
            Phosphide Technical: Lab Project Number: 711-003: QA-396. Unpublished
            study prepared by International Research and Development Corp.  800 p.
                                       143

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                               BIBLIOGRAPHY
MRID
                  CITATION
43903802
43932901
Schaefer, G. (1995) 13-Week Subchronic Neurotoxicity Study in Rats: Zinc
Phosphide Technical: Lab Project Number: 711-004: QA-396.  Unpublished
stu.dy prepared by International Research and Development Corp. 551 p.

Leppert, B. (1996) Magnitude of Zinc Phosphide Residues in No-Till  Corn:
Final Report: Lab Project Number: DWRC QA-428: SARS-95-60.
Unpublished study prepared by Stewart Agricultural Research Services, Inc
and USD A APHIS.  222 p.
                                     144

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                  UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

                 ••'."'           WASHINGTON, D.C. 20460
                                                                       OFFICE OF
                                                                  PREVENTION, PESTICIDES
                                                                  AND TOXIC SUBSTANCES
                       GENERIC AND PRODUCT SPECIFIC
                             DATA CALL-IN NOTICE
CERTIFIED MAIL
Dear Sir or Madam:

      This Notice requires you and other registrants of pesticide products containing the
active ingredient identified in Attachment A of this Notice^ the Data.Call-In Chemical
Status Sheet, to submit certain data as noted herein to the U.S. Environmental Protection
Agency (EPA, the Agency). These data are necessary to maintain the continued
registration of your product(s) containing this active ingredient. Within 90 jlays after you
receive this Notice you must respond as set forth in Section III below. Your response must
state:

       1 .N     How you will comply with the requirements set forth in this Notice and its
             Attachments 1 through 6; or

      2.     Why you believe you are exempt from the requirements listed in this Notice
             and in Attachment 3 (for both generic and product specific data), the
             Requirements Status and Registrant's Response Form, (see section III-B); or

       3.     Why you believe EPA should not require your submission of data in the
             manner specified by this Notice (see section III-D),

       If you do not respond to this Notice, or if you do not satisfy EPA that you will
comply with its requirements or should be exempt or excused from doing so,  then the
registration of your product(s) subject to this Notice will be subject to suspension. We have
provided a list of all of your products subject to this Notice in Attachment 2.  All products
are listed on both the generic and product specific Data Call-In Response Fdrms.  Also
included is a list of all registrants who were sent this Notice (Attachment 5).
                                        145

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       The authority for this Notice is section 3(c)(2)(B) of the Federal Insecticide,
 Fungicide and Rodenticide Act as amended (FIFRA), 7 U.S.C. section 136a(c)(2)(B).
 Collection of this information is  authorized under the Paperwork Reduction Act by OMB
 Approval No. 2070-0107 and 2070-0057 (expiration date 3-31-99).

       This Notice is divided into six sections and six Attachments.  The Notice itself
 contains information and instructions applicable to all Data Call-In Notices. The
 Attachments contain specific chemical information and instructions.  The six sections of the
 Notice are:
 Section I
 Section II
 Section III
 Section IV
 Section V

 Section VI
Why You are Receiving this Notice
Data Required by this Notice
Compliance with Requirements of this Notice
Consequences of Failure to Comply with this Notice
Registrants' Obligation to Report Possible Unreasonable Adverse
Effects
Inquiries and Responses to this Notice
       The Attachments to this Notice are:

       1 -    Data Call-In Chemical Status Sheet
       2 -    Generic Data Call-In and Product Specific Data Call-In Response Forms
             with Instructions (Form A)
       3 -    Generic Data Call-In and Product Specific Data Call-In Requirements Status
             and Registrant's Response Forms with Instructions (Form B)
       4 -    EPA Batching of End-Use Products for Meeting Acute Toxicology Data
             Requirements for Reregistration
       5 -    List of Registrants Receiving This Notice
       6 -    Cost Share and Data Citation Forms
SECTION I.  WHY YOU ARE RECEIVING THIS NOTICE

       The Agency has reviewed existing data for this active ingredient(s) and reevaluated
the data needed to support continued registration of the subject active ingredient(s). This
reevaluation identified additional data necessary to assess the health and safety of the
continued use of products containing this active ingredient(s). You have been sent this
Notice because you "have product(s) containing the subject active ingredient(s).
SECTION II. DATA REQUIRED BY THIS NOTICE

II-A. DATA REQUIRED
                                        146

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      The data required by this Notice are specified in the Requirements Status and
Registrant's Response Forms: Attachment 3 (for both generic and product specific data
requirements).  Depending.on the results of the studies required in this Notice, additional
studies/testing may be required.

II-B. SCHEDULE FOR SUBMISSION OF DATA

      You are required to submit the data or otherwise satisfy the data requirements
specified in the Requirements Status and Registrant's Response Forms (Attachment 3)
within the timeframes provided.

II-C. TESTING PROTOCOL

      All studies required under this Notice must be conducted in accordance with test
standards outlined in the  Pesticide Assessment Guidelines for those studies for which
guidelines have been established.

      These  EPA Guidelines are available from the National Technical Information
Service (NTIS), Attn: Order Desk, 5285 Port Royal Road, Springfield, VA. 22161
(Telephone number: 703-605-6000).

      Protocols approved by the Organization for Economic Cooperation and
Development (OECD) are also acceptable if the OECD recommended test standards
conform to those specified in the Pesticide Data Requirements regulation (40 CFR §
158.70). When using the OECD protocols, they, should be modified as appropriate so that
the data generated by the study will satisfy the requirements of 40 CFR § 158. Normally,
the Agency will not extend deadlines for complying with data requirements when the
studies were not conducted in accordance with acceptable standards. The OECD protocols
are available  from OECD, 2001 L Street, N.W., Washington, D.C. 20036  (Telephone
number 202-785-6323; Fax telephone number 202-785-0350).

      All new studies and proposed  protocols submitted in response to this Data Call-In
Notice must be in accordance with Good Laboratory Practices [40 CFR Part 160].

II-D.  REGISTRANTS RECEIVING PREVIOUS SECTION 3(c)(2)(B) NOTICES
      ISSUED BY THE AGENCY                                                '

      Unless otherwise  noted herein, this Data Call-In does not in any way supersede or
change the requirements  of any previous Data Call-In(s),  or any other agreements entered
into with the  Agency pertaining to  such prior Notice. Registrants must comply with the
requirements of all Notices to  avoid issuance of a Notice of Intent to Suspend their affected
products.
                                        147

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 SECTION III.      COMPLIANCE WITH REQUIREMENTS OF THIS NOTICE

        You must use the correct forms and instructions when completing your response to
 this Notice.  The type of Data Call-In you must comply with (Generic or Product Specific)
 is specified in item number 3 on the four Data Call-In forms (Attachments 2 and 3).

 III-A.  SCHEDULE FOR RESPONDING TO THE AGENCY

        The appropriate responses initially required by this Notice for generic and product
 specific data must be submitted to the Agency within 90 days after your receipt of this
. Notice. Failure to adequately respond to this Notice within 90 days of your receipt will be
 a basis for issuing a Notice of Intent to Suspend (NOIS) affecting your products. This and
 other bases for issuance of NOIS due to failure to comply with this Notice are presented in
 Section IV-A and IV-B.

 III-B.  OPTIONS FOR RESPONDING TO THE AGENCY

        1. Generic Data Requirements

        The options for responding to this Notice for generic data requirements are: (a)
 voluntary cancellation,  (b) delete use(s), (c) claim generic data exemption, (d) agree to
 satisfy  the generic data  requirements imposed by this Notice or (e) request a data
 waiver(s).

       A discussion of how to respond if you choose the Voluntary Cancellation option,
 the Delete Use(s) option or the Generic Data Exemption option is presented below. A
 discussion of the various options available for satisfying the generic data requirements of
 this Notice is contained, in Section III-C. A discussion of options relating to requests for
 data waivers is contained in Section III-D.

       Two forms apply to generic data  requirements, one or both of which must be used
 in responding to the Agency, depending upon your response. These two forms are the
 Data-Call-in Response Form, and the Requirements  Status and Registrant's Response
 Form, (contained in Attachments 2 and 3, respectively).

       The Data Call-In Response  Forms must be submitted  as part of every response to
 this Notice. The Requirements Status and Registrant's Response Forms also must be
 submitted if you do not  qualify for a Generic Data Exemption or are not requesting
 voluntary cancellation of your registration(s).  Please note that the company's authorized
 representative is required to sign the first page of both Data Call-In Response  Forms and
 the Requirements Status and Registrant's Response Forms (if this form is required) and
 initial any subsequent pages. The forms contain separate detailed instructions on the
 response options. Do not alter the printed material. If you have questions or need
 assistance in preparing your response, call or write the contact person(s) identified in
Attachment 1.
                                         148

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       a.     Voluntary Cancellation -              .

       You may avoid the requirements of this Notice by requesting voluntary cancellation
 of your product(s) containing the active ingredient that is the subject of this Notice. If you
 wish to voluntarily cancel your product, you must submit completed Generic and Product
 Specific Data Call-In Response Forms (Attachment 2), indicating your election of this
 option. Voluntary Cancellation is item number 5 on both Data Call-In Response Form(s). If
 you choose this option, these are the only forms that you are required to complete.

       If you choose to voluntarily cancel  your product,  further sale and distribution of
 your product after the effective date of cancellation must be in accordance with the
 Existing Stocks provisions of this Notice, which are contained in Section IV-C.
       b.
Use Deletion -
       You may avoid the requirements of this Notice by eliminating the uses of your
product to which the requirements apply. If you wish to amend your registration to delete
uses, you must submit the Requirements Status and Registrant's Response Form
(Attachment 3), a completed application for amendment, a copy of your proposed amended
labeling, and all other information required for processing the application. Use deletion is
option number 7 under item 9 in the instructions for the Requirements Status and
Registrant's Response Forms. You must also Complete a Data Call-In Response Form by
signing the certification, item number 8.  Application forms for amending registrations
may be obtained from the Registration Support Branch, Registration Division, Office of
Pesticide Programs, EPA, by calling (703) 308-8358.

       If you choose to delete the use(s) subject to this Notice or uses  subject to specific
data requirements, further sale, distribution, or use of your product after one year from the
due date of your 90 day response, is allowed only if the product bears an amended label.

       c.     Generic Data Exemption -

       Under section  3(c)(2)(D) of FIFRA, an applicant for registration of a product is
exempt from the requirement to submit'or cite generic data concerning an active ingredient
if the active ingredient in the product is derived exclusively from purchased, registered
pesticide products containing the active ingredient. EPA has concluded,  as an exercise of
its discretion, that it normally will not suspend the registration of a product which would
qualify and continue to qualify for the generic data exemption in section 3(c)(2)(D) of
FIFRA. To qualify, all of the following requirements must be met:

       (i).  The active ingredient in your registered product must be present solely because
       of incorporation of another registered product which contains the subject active
       ingredient and  is purchased from a source  not connected with you;
                                         149

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       (ii).  Every registrant who is the ultimate source of the active ingredient in your
       product subject to this DCI must be in compliance with the requirements of this
       Notice and must remain in compliance; and

       (iii).  You must have provided to EPA an accurate and current "Confidential
       Statement of Formula"  for each of your products to which this Notice applies.

       To apply for the Generic Data Exemption you must submit a completed Data  Call-In
Response Form, Attachment 2 and all supporting documentation. The Generic Data
Exemption is item number 6a on the  Data Call-In Response Form. If you claim a generic
data exemption you are not required to complete the Requirements Status and Registrant's
Response Form. Generic Data Exemption cannot be selected as an option for responding to
product specific data requirements.

       If you are granted a Generic Data Exemption, you rely on the efforts of other
persons to provide the Agency with the required data. If the registrant(s) who have
committed to generate and submit the required data fail to take appropriate steps to meet
requirements or are no longer  in compliance with this Data Call-in Notice, the Agency will
consider that both they and you are not compliance  and will normally initiate proceedings
to suspend the registrations of both your and their product(s), unless you commit  to submit
and do submit the required data within the specified time. In such cases the Agency
generally will not grant a time extension for submitting the data.

       d.     Satisfying the Generic Data Requirements of this Notice

       There are various options available to satisfy the generic data requirements of this
Notice. These options are discussed in Section III-C.l. of this Notice and comprise options
1 through 6 of item 9  in the instructions for the Requirements Status and Registrant's
Response Form and item 6b on the Data Call-In Response Form.  If you choose item 6b
(agree to satisfy the generic data requirements), you must submit the Data Call-In
Response Form and the  Requirements Status and Registrant's  Response  Form as well as
any other information/data pertaining to the option chosen to address the data requirement.
Your response must be on the forms marked "GENERIC" in item number 3.

       e.     Request for Generic Data Waivers.

       Waivers for generic data are discussed in Section III-D.l.  of this Notice and are
covered by options 8 and 9 of item 9  in the instructions for the Requirements Status and
Registrant's Response Form. If you choose one of these options, you must submit both
forms as well as any other information/data pertaining to the option chosen to address the
data requirement.

       2. Product Specific Data Requirements
                                        150

-------
       The options for responding to this Notice for product specific data are: (a)
voluntary cancellation, (b) agree to satisfy the product specific data requirements imposed
by this Notice or (c) request a data waiver(s).

       A discussion of how to respond if you choose the Voluntary Cancellation option is
presented below. A discussion of the various options available for satisfying the product
specific data requirements of this Notice is contained in Section III-C. 2.  A discussion of
options relating to requests for data waivers is contained in Section III-D.2.

       Two forms apply to the product specific  data requirements one or both of which
must be used in responding to the Agency, depending upon your .response.  These forms
are the Data-Call-in Response Form, and the Requirements Status and Registrant's
Response Form, for product specific data (contained in Attachments 2 and  3, respectively)..
The Data Call-in Response Form must be submitted as part of every response to this
Notice.  In addition, one copy of the Requirements Status and Registrant's  Response Form
also must be submitted for each product listed on the Data Call-In Response Form unless
the voluntary cancellation option is selected.  Please note that the company's authorized
representative is required to sign the first page of the Data Call-In Response Form and
Requirements Status and Registrant's Response  Form (if this form is required) and initial
any subsequent pages. The forms contain separate detailed instructions on the response
options.  Do not alter the printed material. If you have questions or need assistance in
preparing your response, call or write the contact person(s) identified in Attachment 1.

       a.     Voluntary  Cancellation           '

       You may avoid the requirements,of this Notice by requesting voluntary cancellation
of your product(s) containing the active ingredient that is the subject of this Notice. If you
wish to voluntarily  cancel your product, you must submit a completed Data Call-In
Response Form, indicating your election of this option. Voluntary cancellation is item
number 5 on both the Generic and Product Specific  Data Call-In Response  Forms. If you
choose this option,  you must complete both Data Call-In response forms. These are; the
only forms that you are required to complete.

       If you  choose to voluntarily cancel your product, further sale and distribution of ,
your product after the effective date  of cancellation  must be in accordance  with the
Existing Stocks provisions of this Notice which are  contained in Section IV-C.
                                          151

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       b.     Satisfying the Product Specific Data Requirements of this Notice.

       There are various options available to satisfy the product specific data requirements
of this Notice. These options are discussed in Section III-C..of this Notice and comprise
options 1 through 6 of item 9 in the instructions for the product specific Requirements
Status and Registrant's Response Form and item numbers 7a and 7b (agree to satisfy the
product specific data requirements for an MUP or EUP as applicable) on the product
specific Data Call-In Response Form.  Note that the options available for addressing
product specific data requirements differ slightly from those options for fulfilling generic
data requirements. Deletion of a use(s) and the low volume/minor use option are not valid
options for fulfilling product specific data requirements.  It is important to ensure that you
are using the correct forms and instructions when completing your response to  the
Reregistration Eligibility Decision document.

       c.     Request for Product Specific Data Waivers.

       Waivers for product specific data are discussed in Section III-D.2. of this Notice
and are covered by option 7 of item 9  in the instructions for the Requirements Status and
Registrant's Response Form. If you choose this option, you must submit the Data Call-In
Response Form and the Requirements  Status and Registrant's Response Form as well as
any other information/data pertaining to the option chosen to address the data requirement.
Your response must be on the forms marked "PRODUCT SPECIFIC" in item number 3.

III-C SATISFYING THE DATA REQUIREMENTS OF THIS NOTICE
       1.
Generic Data
       If you acknowledge on the Generic Data Call-In Response Form that you agree to
satisfy the generic data requirements (i.e. you select item number 6b), then you must select
one of the six options on the Generic Requirements Status and Registrant's Response Form
related to data production  for each data requirement. Your option selection should be
entered under item number 9, "Registrant Response." The six options related to data
production are the first six options discussed under item 9 in the instructions for
completing the Requirements Status  and Registrant's Response Form. These six options are
listed immediately below with information in parentheses to guide you to additional
instructions provided in this  Section. The options are:

       (1)    I will generate and submit data within the specified timeframe (Developing
             Data)
       (2)    I have entered into an agreement with one or more registrants to develop data
             jointly (Cost Sharing)
       (3)    I have made offers to cost-share (Offers to Cost Share)
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       (4)     I am submitting an existing study that has not been submitted previously to
              the Agency by anyone (Submitting an Existing Study)
       (5)     I am submitting or citing data to upgrade a study classified by EPA as
              partially acceptable and upgradeable (Upgrading a Study)
       (6)     I am citing an existing study that EPA has classified as acceptable Or an
              existing study .that has been submitted but not reviewed by the Agency
              (Citing an Existing Study)

Option 1. Developing Data

       If you choose to develop the required data it must be in conformance with Agency
guidelines and with other Agency requirements as referenced herein and in the
attachments. All data generated and submitted must comply with the Good Laboratory
.Practice  (GLP) rule (40 CFR Part 160), be conducted according to the Pesticide
Assessment Guidelines (PAG) and be in conformance with the requirements of PR Notice
86-5. In  addition,  certain studies require Agency approval of test protocols in advance of
study initiation. Those studies for which a protocol must be submitted have been identified
in the Requirements Status and Registrant's Response Form and/or footnotes to the form.
If you wish to use a protocol which differs from the options discussed in Section II-C of
this Notice, you must submit a detailed description of the proposed protocol and your
reason for wishing to use it. The Agency may choose to reject a protocol not specified in
Section II-C. If the Agency rejects your protocol you will be notified in writing, however,
you should be aware that rejection of a proposed protocol will not be a basis for extending
the deadline for submission of data.                   .      ,

       A progress report must be submitted for each study within 90 days from the date
you are required to commit to generate or undertake some other means to address that
study requirement, such as making an offer to  cost share or agreeing to share in  the cost of
developing that study.  This 90-day progress report must include the date the study was or
will be initiated and, for studies  to be started within 12 months of commitment, the name
and address of the laboratory(ies) or individuals who are or will be conducting the study.

       In addition, if the time  frame for submission of a final report is more than 1 year,
interim reports must be submitted at 12 month intervals from the date you are required to
commit to generate or otherwise address the requirement for the study. In addition to the
other information  specified in  the preceding paragraph, at a minimum, a brief description
of current activity on and the status of the study must be included as well as a full
description  of any problems encountered since the last progress report.
       The time frames in the Requirements Status and Registrant's Response Form are the
time frames that the Agency is allowing for the submission of completed study reports or
protocols. The noted deadlines run from the date of the receipt of this Notice by the
registrant. If the data are not submitted by the deadline, each registrant is subject to receipt
of a Notice of Intent to Suspend the affected registration(s).

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       If you cannot submit the data/reports to the Agency in the time required by this
 Notice and intend to seek additional time to meet the requirements(s), you must submit a
 request to  the Agency which includes: (1) a detailed description of the expected difficulty
 and (2) a proposed schedule including alternative dates for meeting such requirements on a
 step-by-step basis. You must explain any technical or laboratory difficulties and provide
 documentation from the laboratory performing the testing. While EPA is considering your
 request, the original deadline remains. The Agency will respond to your request in writing.
 If EPA does not grant your request, the  original  deadline remains. Normally, extensions
 can be requested only in cases of extraordinary testing problems beyond the expectation or
 control of  the registrant. Extensions will not be given in submitting the  90-day responses.
 Extensions will not be considered if the  request for extension is not made in a timely
 fashion; in no event shall  an extension request be considered if it is submitted at or after
 the lapse of the subject  deadline.

 Option 2. Agreement to Share in Cost to Develop Data

       If you choose to  enter into an agreement to share in the cost of producing the
 required data but will not be  submitting  the data  yourself, you must provide the name of
 the registrant who will be submitting the data. You must also provide EPA  with
 documentary evidence that an agreement has been formed. Such evidence may be  your
 letter offering to join in an agreement and the other registrant's acceptance  of your offer,
 or a written statement by the  parties that an agreement exists. The agreement to produce
 the data need not specify all of the terms of the final arrangement between the parties or
 the mechanism to resolve  the terms. Section 3(c)(2)(B) provides that if the parties cannot
 resolve the terms of the agreement they  may resolve their differences through binding
 arbitration.

 Option 3. Offer to Share in the Cost of Data Development

       If you have made an offer to pay  in an attempt to enter into an agreement or amend
 an existing agreement to meet the requirements of this Notice and have been unsuccessful,
 you may request EPA (by selecting this  option) to exercise its discretion not to suspend
 your registration(s), although you did not comply with the data submission requirements of
 this Notice. EPA has determined that as  a general policy,  absent other relevant
 considerations, it will not  suspend the registration of a product of a registrant who has in
 good faith  sought and continues to seek to enter into a joint data development/cost sharing
program, but the other registrant(s) developing the data has refused to accept the offer. To
 qualify for this option, you must submit  documentation to the Agency proving that you
have made  an offer to another registrant (who has an obligation to submit data) to  share in
the burden  of developing that data. You  must also submit to the Agency a completed EPA
 Form 8570-32, Certification of Offer to  Cost Share in the Development  of Data,
 Attachment 6.  In addition, you must demonstrate that the other registrant to whom the
 offer was made has not accepted your offer to enter into a cost-sharing agreement  by
 including a copy of your offer and proof of the other registrant's receipt of that offer (such
as a certified mail receipt). Your offer must, in addition to anything else, offer to  share in

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 the burden of producing the data upon terms to be agreed to or, failing agreement, to be
 bound by binding arbitration as provided by FlFRA section 3(c)(2)(B)(iii) and must not
 qualify this offer. The other registrant must also inform EPA of its election of an option to
 develop and submit the data required by this Notice by submitting a Data Call-In Response
 Form and a Requirements Status and Registrant's Response Form committing to develop
 and submit the data required by this Notice.

       In order for you to avoid suspension under this option, you may not withdraw your
 offer to share in the burden of developing the data. In addition, the other registrant must
 fulfill its commitment to develop and submit the  data as required by this  Notice. If the
 other registrant fails to develop the data or for some other reason is subject to suspension,
 your registration as well as that of the other registrant normally will be subject to initiation
 of suspension proceedings, unless you commit to submit, and do submit, the required data
 in the specified time frame. In such cases, the Agency generally will not grant a time
 extension for submitting the data.

 Option 4. Submitting an Existing Study

       If you choose to submit an existing study  in response to this Notice, you must
 determine that the study satisfies the requirements imposed by this Notice. You may  only
 submit a study that has not been previously submitted to the Agency or previously cited by
 anyone. Existing studies are studies which predate issuance .of this Notice. Do not use this
 option if you are submitting data to upgrade a study. (See Option 5).

       You should be aware that if the Agency determines that the study  is not acceptable,
the Agency will require you to comply with this Notice, normally without an extension of
the required date of submission. The Agency may determine at any time that a study is not
valid and needs to be repeated.                                          ,

      To meet the requirements of the DCI Notice for submitting an existing study,  all of
the following three criteria must be clearly met:
       a.
You must certify at the time that the existing study is submitted that the raw
data and specimens from the study are available for audit and review and you
must identify where they are available. This must be done in accordance with
the requirements of the Good Laboratory Practice  (GLP) regulation, 40 CFR
Part 160. As stated in 40 CFR 160.3, Raw data means any laboratory
worksheets, records, memoranda, notes, or exact copies thereof, that are the
result of original observations and activities of a study and are necessary for
the reconstruction and evaluation of the report of that study. In the event that
exact transcripts of raw data have been prepared (e.g., tapes which have
been transcribed verbatim, dated, and verified accurate by  signature), the
exact copy or exact transcript may be substituted for the original source as
raw data. 'Raw data1 may include photographs,,microfilm or microfiche
copies, computer printouts, magnetic media,  including dictated observations,

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b.
c.
              and recorded data from automated instruments." The term "specimens",
              according to 40 CFR 160.3, means "any material derived from a test system
              for examination or analysis."

              Health and safety studies completed after May 1984 must also contain all
              GLP-required quality assurance and quality control information pursuant to
              the requirements of 40 CFR Part 160. Registrants also must certify at the
              time of submission of the existing study that such GLP information is
              available for post May  1984 studies by including an appropriate statement on
              or attached to the study signed by an authorized official or representative of
              the registrant.

              You must certify that each study fulfills the acceptance criteria for the
              Guideline relevant to the study provided in the FIFRA Accelerated
              Reregistration Phase 3  Technical Guidance and that the study has been
              conducted according to the Pesticide Assessment Guidelines (PAG) or meets
           .   the purpose of the PAG (both documents available from NTIS). A  study not
              conducted according to the PAG may be submitted to the Agency for
              consideration if the registrant believes that the study clearly meets the
              purpose of the PAG. The registrant is referred to 40 CFR 158.70 which
              states the Agency's policy regarding acceptable protocols. If you wish to
              submit the study, you must, in addition to certifying that the purposes of the
              PAG are met by the study, clearly articulate the rationale why you  believe
              the study meets the purpose of the PAG, including copies of any supporting
              information or data. It has been the Agency's experience that studies
              completed prior to January 1970 rarely satisfied the purpose of the  PAG and
              that necessary raw data usually are not available for such studies.

       If you  submit an existing study, you must certify  that the study meets all
requirements of the criteria outlined above.

       If EPA has previously reviewed a protocol for a study you are submitting, you must
identify any action taken by the Agency on the protocol and must indicate, as part of your
certification, the manner in which all  Agency comments, concerns, or issues were
addressed in the final protocol and study.

       If you know of a study pertaining to any requirement in this Notice which  does not
meet the criteria outlined above but does contain factual  information regarding
unreasonable adverse effects, you must notify the Agency of such a study. If such a study
is'in the Agency's files, you need only cite it along with  the notification. If not in the
Agency's files, you must submit a summary  and copies as required by PR Notice  86-5.

Option 5. Upgrading a Study
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        If a study has been classified as partially acceptable and upgradeable, you may
 submit data to upgrade that study. The Agency will review the data submitted and
 determine if the requirement is satisfied. If the Agency decides the requirement is not
 satisfied, you may still be required to submit new data normally without any time
 extension. Deficient, but upgradeable studies will normally be classified as supplemental.
 However, it is important to note that not all studies classified as supplemental are
 upgradeable. If you have questions regarding the classification of a study or whether a
' study may be upgraded, call or write the contact person listed in Attachment 1. If you
 submit data to  upgrade an existing study you must  satisfy or supply information to correct
 all deficiencies in the study identified by EPA. You must provide a clearly articulated
 rationale of how the deficiencies have been remedied or corrected and why the study
 should be rated as acceptable to EPA. Your submission must also specify the MRID
 number(s) of the study which you are attempting to upgrade  and must be in conformance
 with PR Notice 86-5.

       Do not submit additional data for the purpose of upgrading a study classified as
 unacceptable and determined by the Agency as not capable of being upgraded.

       This option also should be used to cite data  that has been previously submitted to
 upgrade a study., but has not yet been reviewed by  the Agency. You must provide the
 MRID number of the data submission as well as the MRID number of the study being
 upgraded.

       The criteria for submitting an existing study, as specified in Option 4 above, apply
 to all data submissions intended to upgrade studies. Additionally, your submission of data
 intended to upgrade  studies must be accompanied by a certification that you comply with
 each of those criteria, as well as a certification regarding protocol compliance with Agency
 requirements.

 Option  6. Citing Existing Studies

       If you choose to .cite a.study that has been previously  submitted to EPA, that study
must have been previously classified by EPA as acceptable, or it must be a study which has
not yet been reviewed by the Agency. Acceptable toxicology studies generally will have
been classified  as "core-guideline" or "core-minimum." For ecological effects studies, the
classification generally would be a rating of "core." For all other disciplines the
classification would be "acceptable." With respect to any studies for which you wish to
select this option, you must provide the MRID number of the study you are citing and, if
the study has been reviewed by the Agency,  you must provide the Agency's classification
of the study.

       If you are citing a study of which you are not the original data submitter, you must
submit a completed copy of EPA Form 8570-34, Certification with Respect to Citation of
Data and EPA Form 8570-35 Data Matrix.
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       2. Product Specific Data

       If you acknowledge on the product specific Data Call-in Response Form that you
 agree to satisfy the product specific data requirements (i.e. you select option 7a or 7b),
 then you must select one of the six options on the Requirements Status,and Registrant's
 Response Form related to data production for each data requirement. Your option selection
 should be entered under item number 9,  "Registrant Response." The six options related to
 data production are the first six options discussed under item 9 in the instructions for
 completing the Requirements Status and Registrant's Response Form. These six options are
 listed immediately below with information in parentheses to guide registrants to additional
 instructions provided in this Section. The options are:

       (1)    I will generate and submit data within the specified time-frame (Developing
              Data)
       (2)    I have entered into an agreement with one or more registrants to develop data
              jointly (Cost Sharing)
       (3)    I have made offers to cost-share (Offers to Cost Share)
       (4)    I am submitting an existing study that has not been submitted previously to
              the Agency by anyone (Submitting an Existing Study)
       (5)    I am submitting or citing data to upgrade a study classified by EPA as
              partially acceptable and upgradeable (Upgrading a Study)
       (6)    I am citing an existing study that EPA has classified as acceptable or an
              existing study that has been submitted but not reviewed by the Agency
              (Citing an Existing Study)

Option 1. Developing Data — The requirements for developing product specific data are
the same as those described for generic data (see Section III.C.I, Option 1) except that
normally no protocols or progress reports are required.

Option 2. Agree to Share in Cost to Develop Data ~ If you enter into an agreement to cost
share, the same requirements apply to product specific data as to generic data (see Section
IH.C.1, Option 2). However, registrants may only choose this option for acute toxicity
data and certain efficacy data and only if EPA has indicated in the attached data tables that
your product and at least one other product are similar for purposes of depending on the
same data. If this is the case, data may be generated for just one of the products in the
group. The registration number of the product for which.data will be submitted must be
noted in the agreement to cost share by the  registrant selecting this option.

Option 3. Offer to Share in the Cost of Data Development --The same requirements for
generic data (Section III.C.I., Option 3) apply to this option. This option only applies to
acute toxicity  and certain efficacy data as described in option 2 above.

Option 4. Submitting an Existing Study - The same requirements  described for generic
data (see Section III.C.l., Option 4) apply to this option for product specific data.
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Option 5. Upgrading a Study — The same requirements described for generic data (see
Section ni.C.l., Option 5) apply to this option for product specific data;

Option 6. Citing Existing Studies — The same requirements described for generic data (see
Section III.C. 1., Option 6) apply to this option for product specific data.

       Registrants who select one of the above 6 options must meet all of the requirements
described in the instructions for completing the Data Call-In Response Form and the
Requirements Status and Registrant's Response Form, and in the generic data requirements
section (III.C.I.), as appropriate.                                  .
II-I-D REQUESTS FOR DATA WAIVERS

       1.     Generic Data

       There are two types of data waiver responses to this Notice. The first is a request
for a low volume/minor use waiver and the second is a waiver request based on your belief
that the data requirement(s) are not appropriate for your product.
       a.
Low Volume/Minor Use Waiver
             Option 8 under item 9 on the Requirements Status and Registrant's Response
      Form. Section 3(c)(2)(A) of FIFRA requires EPA to consider the appropriateness of
      requiring data for low volume/minor use pesticides. In implementing this provision,
      EPA considers low volume pesticides to be only those active ingredients whose total
      production volume for all pesticide registrants is small. In determining whether to
      grant a low volume, minor use waiver, the Agency will consider the extent, pattern
      and volume of use, the economic incentive to conduct the testing, the importance of
      the pesticide, and the  exposure and risk from use of the pesticide. If an active
      ingredient is used for  both high volume and low volume uses, a low volume
      exemption will not be approved. If all uses of an active ingredient are low volume
      and the combined volumes for all uses are also low, then an exemption may be
      granted,  depending on review of other information outlined below. An exemption
      will not be granted if  any registrant of the active ingredient elects to conduct the
      testing. Any registrant receiving a low volume/minor use waiver must remain
      within the sales figures in their forecast supporting the waiver request in order to
      remain qualified for such waiver. If granted a waiver, a registrant will be required,
    - as a condition of  the waiver, to  submit annual sales reports. The Agency will
      respond to requests for waivers  in writing.     ;

      To apply for a low volume/minor use waiver, you must submit the  following
information, as  applicable to your product(s), as part of your 90-day response to this
Notice:
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        (i). Total company sales (pounds and dollars) of all registered product(s)
 containing the active ingredient. If applicable to the active ingredient, include
 foreign sales for those products that are not registered in this country but are
 applied to sugar (cane or beet), coffee, bananas, cocoa, and other such crops'.
 Present the above information by year for each of the past five years.

        (ii)  Provide an estimate of the sales (pounds and dollars) of the active
 ingredient for each major use site. Present the above information by year for each
 of the past five years.

        (iii) Total direct production cost of product(s) containing  the active
 ingredient by year for the past five years. Include information on raw material cost,
 direct labor cost, advertising, sales and marketing, and any other significant costs
 listed separately.

        (iv) Total indirect production cost (e.g. plant overhead, amortized plant and
 equipment) charged to product(s) containing the active ingredient by year for the
 past five years. Exclude all non-recurring costs that were directly related to the
 active ingredient, such as costs of initial registration and any data development.

        (v)  A list of each data requirement for which you seek a waiver. Indicate the
 type of waiver sought and the estimated cost to  you (listed separately for each data
 requirement and associated test) of conducting the testing needed  to fulfill each of
 these data requirements.

        (vi)  A list of each data requirement for which you  are not seeking any
 waiver and the estimated cost to you (listed separately for  each data requirement and
 associated test)  of conducting the testing needed to fulfill each of these data
 requirements.

       (vii) For each of the next ten years, a year-by-year forecast of company
 sales (pounds and dollars) of the active ingredient,  direct production costs of
 product(s) containing the active ingredient (following the parameters in item 2
 above), indirect production costs of product(s) containing the active ingredient
 (following the parameters in item 3 above), and costs of data development
 pertaining to the active ingredient.

       (viii) A description of the  importance and unique benefits  of the active
 ingredient to users. Discuss the use patterns and the effectiveness  of the active
 ingredient relative to registered alternative chemicals and non-chemical control
 strategies. Focus on benefits unique to the active ingredient, providing information
 that is as quantitative as possible.  If you do not have quantitative data upon which to
base your estimates, then present the reasoning used to derive your estimates. To
assist the Agency in determining the degree of importance  of the active ingredient in
terms of its benefits, you should provide information on any of the following

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faqtors, as applicable to your product(s): (a) documentation of the usefulness of the .
active ingredient in Integrated Pest Management, (b) description of the beneficial
impacts on the environment of use of the active ingredient, as opposed to its
registered alternatives, (c) information on the breakdown of the active ingredient
after use and on its persistence in the environment, and (d) description of its
usefulness against  a pest(s) of public health significance.

       Failure to submit sufficient information for the Agency to make a
determination regarding a request for a low volume/minor use waiver will result in
denial of the request for a waiver.    ,

b.     Request for Waiver of Data

       Option 9, under Item 9, on the Requirements Status and Registrant's
Response Form. This  option may be used if you believe that a particular data
requirement should not apply because the requirement is inappropriate.  You must
submit a rationale  explaining why you believe the data requirements should not
apply. You  also must  submit the current label(s) of your product(s) and, if a current
copy of your Confidential Statement of Formula is not already on file you must
submit a current copy.

       You  will be informed of the Agency's decision  in writing. If the Agency
determines that the data requirements of this Notice are not appropriate to your
product(s), you will not be required to supply the data pursuant to section
3(c)(2)(B). If EPA determines that the data are required for your product(s), you
must choose a method of meeting the requirements of this Notice within the time
frame provided by this Notice. Within 30 days of your receipt of the Agency's
written decision, you  must submit a revised Requirements Status and Registrant's
Response Form indicating the option chosen.

2. Product Specific Data

       If you request  a waiver for product specific data because you believe it is
inappropriate,  you must attach a complete justification for the request including
technical reasons, data and references to relevant EPA regulations, guidelines or
policies. (Note: any supplemental data must be submitted in the format required by
PR Notice 86-5).  This will be the only opportunity to state the reasons or provide
information in support of your request. If the Agency approves your waiver request,
you will not be required to supply the data pursuant to section 3(c)(2)(B) of FIFRA.
If the Agency denies  your waiver request, you must choose an option for meeting
the data requirements of this Notice within 30 days of the receipt of the Agency's
decision. You must indicate and submit the option chosen on the product specific
Requirements Status and Registrant's Response Form. Product specific data
requirements for product chemistry, acute toxicity and efficacy (where appropriate)
are required for all products and the Agency would grant a waiver only under

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       extraordinary circumstances. You should also be aware that submitting a waiver
       request will not automatically extend the due date for the study in question. Waiver
       requests submitted without adequate supporting rationale will be denied and the
       original due date will remain in force.
SECTION IV.      CONSEQUENCES OF FAILURE TO COMPLY WITH THIS
                    NOTICE                        ~          "

IV-A  NOTICE OF INTENT TO SUSPEND

       The Agency may issue a Notice of Intent to Suspend products subject to this Notice
due to failure by a registrant to comply with the requirements of this Data Call-In Notice,
pursuant to FIFRA section 3(c)(2)(B). Events which may be the basis for issuance of a
Notice of Intent to Suspend include, but are not limited to, the following:
       1.
      6.


      7.

      8.
 Failure to respond as required by this Notice within 90 days of your receipt
 of this Notice.

 Failure to submit on the required schedule an acceptable proposed or final
 protocol when such is required to be submitted to the Agency for review.

 Failure to submit on the required schedule an adequate progress report on a
 study as required by this Notice.

 Failure to submit on the required schedule acceptable data as required by this
 Notice.

 Failure to take a required action  or submit adequate information pertaining to
 any option chosen to address the data requirements (e.g., any required action
 or information pertaining to submission or citation of existing studies or
 offers, arrangements, or arbitration on the sharing of costs or the formation
 of Task Forces, failure to comply with the terms of an agreement or
 arbitration concerning joint data  development or failure to comply with any
 terms of a data waiver).

 Failure to submit supportable certifications as to the conditions of submitted
 studies, as required by Section III-C of this Notice.

 Withdrawal of an offer to share in the cost of developing required data.

 Failure of the registrant to whom you have tendered an offer to share in the
 cost of developing data and provided proof of the registrant's receipt of such
offer or failure of a registrant on whom you rely for a generic data
exemption either to:

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       9.
a. Inform EPA of intent to develop and submit the data required by this
Notice on a Data Call-In Response Form and a Requirements Status and
Registrant's Response Form.

b. Fulfill the commitment to develop and submit the data as required by this
Notice; or

c. Otherwise take appropriate steps to meet the requirements stated in this
Notice, unless you commit to submit and do submit the required data in the
specified time frame.       •

Failure to take any required or appropriate steps, not mentioned above, at
any time following the issuance of this Notice.                   '
 IV-B. BASIS FOR DETERMINATION THAT SUBMITTED STUDY IS
       UNACCEPTABLE    ~~~"~—

       The Agency may determine that a study (even if submitted within the required time)
 is unacceptable and constitutes a basis for issuance of a Notice of Intent to Suspend. The
 grounds for suspension include, but are not limited to, failure to meet  any of the following:

       1)    EPA requirements specified in the Data Call-In Notice or~other documents
       incorporated by reference (including, as applicable, EPA Pesticide Assessment
       Guidelines, Data Reporting Guidelines, and GeneTox Health Effects  Test
       Guidelines) regarding the design, conduct, and reporting of required  studies. Such
       requirements include, but are not limited to, those relating to test material, test
       procedures, selection of species, number of animals, sex and distribution of
       animals, dose and effect levels to be tested or attained, duration of test, and, as
       applicable, Good Laboratory Practices.

       2)    EPA .requirements regarding the submission of protocols, including the
       incorporation of any changes required by the Agency following  review.

       3)    EPA requirements regarding the reporting of data, including the manner of
       reporting, the completeness of results, and the adequacy of any  required  supporting
       (or raw) data, including, but not limited to, requirements referenced or included in
       this Notice or contained in PR 86-5. All studies must be submitted in the form of a
       final report; a preliminary report will not be considered to fulfill the submission
       requirement.

IV-C  EXISTING STOCKS OF SUSPENDED OR CANCELLED PRODUCTS

       EPA has statutory authority to permit continued sale, distribution and use of
existing stocks of a pesticide product which has been suspended or cancelled if doing so
would be consistent with the purposes of the Act.

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        The Agency has 'determined that such disposition by registrants of existing .stocks
 for a suspended registration when a section 3(c)(2)(B) data request is outstanding generally
 would not be consistent with the Act's purposes. Accordingly,.the Agency anticipates
 granting registrants permission to sell, distribute, or use existing stocks  of suspended
 product(s) only in exceptional  circumstances. If you believe such disposition of existing
 stocks of your product(s) which may be suspended for failure to comply with this Notice
 should be permitted, you have the burden of clearly demonstrating to EPA that granting
 such permission would be consistent with the Act. You  also must explain why an "existing
 stocks" provision is necessary, including a statement of the quantity of existing stocks and
 your estimate of the time required for their sale, distribution, and use. Unless you meet
 this burden, the Agency will not consider any request pertaining to the continued sale,
 distribution, or use of your existing stocks after suspension.

       If you request a voluntary cancellation of your product(s) as a response to this
 Notice and your product is in full compliance with all Agency requirements, you will have,
 under most circumstances, one year from the date your 90 day response  to this Notice is
 due, to sell, distribute, or use existing stocks. Normally, the Agency will allow persons
 other than the registrant such as independent distributors, retailers and end users  to sell,
 distribute or use such existing stocks until the stocks are exhausted. Any sale, distribution
 or use of stocks of voluntarily cancelled products containing an active ingredient for which
 the Agency has particular risk concerns will be determined on a case-by-case basis.

       Requests for voluntary cancellation received after the 90 day response period
 required by this Notice will not result in the agency granting any additional time  to sell,
 distribute, or use existing stocks beyond a year from the date the 90 day  response was due,
 unless you demonstrate to the Agency that you are in full compliance with all Agency
 requirements, including  the requirements of this Notice. For example, if you decide to
 voluntarily cancel your registration six months before a  3-year study is scheduled to be
 submitted, all progress reports  and other information necessary to establish that you have
 been conducting the study in an acceptable and good faith manner must have been
 submitted to the Agency, before EPA will consider granting an existing stocks provision.
SECTION V.
REGISTRANTS' OBLIGATION TO REPORT POSSIBLE
UNREASONABLE ADVERSE EFFECTS
       Registrants are reminded that FIFRA section 6(a)(2) states that if at any time after a
pesticide is registered a registrant has additional factual information regarding
unreasonable adverse effects on the environment by the pesticide, the registrant shall
submit the information to the Agency. Registrants must notify the Agency of any factual
information they have, from whatever source, including but not limited to interim or
preliminary results of studies, regarding unreasonable adverse effects on man or the
environment. This requirement continues as long as the products are registered by the
Agency.
                                         164

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  SECTION VI.
INQUIRIES AND RESPONSES TO THIS NOTICE
        If you have any questions regarding the requirements and procedures established by
•  this Notice, call the contact person(s) listed in Attachment 1, the Data Call-In Chemical
  Status Sheet.

        All responses to this Notice must include completed Data Call-In Response Forms
  (Attachment 2)and completed Requirements Status and Registrant's Response Forms
  (Attachment 3), for both (generic and product specific data) and any other documents
  required by this Notice, and should be submitted to the contact person(s) identified in
  Attachment 1.  If the voluntary cancellation or generic data exemption option is chosen,
  only the Generic and Product Specific Data Call-In Response Forms need be submitted.

        The Office of Compliance (OC) of the Office of Enforcement and Compliance
  Assurance (OECA), EPA, will be monitoring the  data being generated in response to this
  Notice.                                                                   .

                                  Sincerely yours,
                                 Lois A. Rossi, Director
                                 Special Review and
                                   Reregistration Division
  Attachments
        The Attachments to this Notice are:

        1 -    Data Call-In Chemical Status Sheet
        2 -    Generic Data Call-In and Product Specific Data Call-In Response Forms
               with Instructions
        3 -    Generic Data Call-In and Product Specific Data Call-In Requirements Status
               and Registrant's Response Forms with Instructions
        4 -    EPA Batching of End-Use Products for Meeting Acute Toxicology Data
               Requirements for Reregistration
        5-,    List of Registrants Receiving This Notice
        6 -    Confidential Statement of Formula, Cost Share and Data Citation Forms
                                          165

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166

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          ZINC PHOSPHIDE DATA CALL-IN CHEMICAL STATUS SHEET

INTRODUCTION

       You have  been sent this  Product Specific  Data Call-In Notice because you have
product(s) containing Zinc phosphide.

       This Product Specific Data  Call-In Chemical Status Sheet, contains an overview of data
required by this notice, and point of contact for inquiries pertaining to the reregistration of
Zinc phosphide.  This attachment is to be used in conjunction with (1) the Product Specific
Data Call-In Notice, (2) the Product Specific Data Call-In Response Form (Attachment 2), (3)
the Requirements Status and Registrant's Form (Attachment 3), (4) EPA's Grouping of End-
Use Products for Meeting Acute Toxicology Data Requirement (Attachment 4), (5) the EPA
Acceptance Criteria (Attachment  5),  (6) a list of registrants receiving this DC! (Attachment
6) and (7) the Cost Share and Data Citation Forms  in replying to this Zinc phosphide Product
Specific Data Call-In (Attachment 7). Instructions and guidance accompany each form.

DATA REQUIRED BY THIS NOTICE

       The additional data requirements needed to complete the database for Zinc phosphide
are contained in the Requirements Status and  Registrant's Response, Attachment 3.  The
Agency has concluded that additional data on Zinc phosphide are needed for specific products.
These data are required to be submitted to the  Agency within the time frame listed.  These
data are needed to fully complete the reregistration of all eligible Zinc phosphide products.

INQUIRIES AND RESPONSES TO  THIS NOTICE
      If you have  any questions regarding this product specific  data requirements and
procedures established by this Notice, please contact Frank Rubis at (703) 308-8184.

      All  responses to this Notice for the  Product Specific data requirements should be
      submitted to:
             Frank Rubis
             Chemical Review Manager Team 81
             Product Reregistration Branch
             Special Review and Reregistration Branch 7508W
             Office of Pesticide Programs
             U.S. Environmental Protection Agency
             Washington, D.C. 20460

             RE: Zinc phosphide
                                        167

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          ZINC PHOSPHIDE DATA CALL-IN CHEMICAL STATUS SHEET

 INTRODUCTION

       You  have been sent this Generic Data Call-In Notice because you have product(s)
 containing Zinc phosphide.

       This Generic Data Call-In Chemical Status Sheet, contains an overview of data required
 by  this notice, and point of contact  for inquiries pertaining to the reregistration of Zinc
 phosphide.  This attachment is to be used in conjunction with (1) the Generic Data Call-in
 Notice, (2) the Generic Data Call-In Response Form (Attachment 2), (3) the Requirements
 Status and Registrant's Form (Attachment 2), (4) a list of registrants receiving this DCI
 (Attachment 4), (5)  the EPA Acceptance Criteria (Attachment 5), and (6) the Cost Share and
 Data Citation Forms in replying to this  Zinc phosphide Generic Data Call In (Attachment F).
 Instructions  and guidance accompany each form.

 DATA REQUIRED BY THIS NOTICE
       The additional data requirements needed to complete the generic database for Zinc
 phosphide are  contained in the Requirements Status and Registrant's Response, Attachment
 C.  The Agency has concluded that additional product chemistry data on Zinc  phosphide are
 needed.  These  data are needed to fully complete  the reregistration of all eligible Zinc
phosphide products..

INQUIRIES AND RESPONSES TO THIS NOTICE

       If you have any questions regarding the generic data requirements and procedures
established by  this Notice, please contact Dana Lateulere at (703) 308-8044.

       All responses to this Notice for the generic data requirements should be submitted to:

            Susan Jennings, Chemical Review Manager
            Reregistration Branch 3
            Special Review and Registration Division (H7508W)
            Office of Pesticiafide Programs
            U.S.  Environmental Protection Agency
            Washington, D.C.  20460
            RE:  Zinc phosphide
                                       168

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  Instructions For Completing The "Data Call-In Response Forms" For The Generic
                         And Product Specific Data Call-In
INTRODUCTION

These instructions apply to the Generic and Product Specific "Data Call-In Response
Forms" and are to be used by registrants to respond to generic and product specific Data
Call-ins as part of EPA's Reregistratioh Program under the Federal Insecticide, Fungicide,
and Rodenticide Act.  If you are an end-use product registrant only and have been sent
this DCI letter as part of a RED document you have been sent just the product specific
"Data Call-In Response Forms." Only registrants responsible for generic data have been
sent the generic data response form.  The type of Data Call-In (generic or product
specific) is indicated in item number 3 ("Date and Type of DCI") on each form.


Although the form is the same for both generic and product specific data, instructions for
completing these forms are different.  Please read these instructions carefully before filling
out the forms.

EPA has developed  these forms individually for each registrant, and has preprinted these
forms with a number of items.  DO NOT use these forms  for any other active ingredient.

Items 1 through 4 have been preprinted on the  form.  Items 5 through 7 must be completed
by the registrant as  appropriate. Items 8 through 11 must be completed by the registrant
before .submitting a  response to the Agency.

The public reporting burden for this collection of information is estimated to average 15
minutes per response, including time for reviewing instructions,  searching existing data
sources, gathering and maintaining the data needed, and completing and reviewing the
collection of information. Send comments regarding the burden estimate or any other
aspect of this collection of information, including suggestions for reducing this burden, to
Chief, Information  Policy Branch, Mail Code 2137, U.S. Environmental Protection
Agency, 401 M St., S.W., Washington, D.C.  20460; and to the Office of Management
and Budget, Paperwork Reduction Project 2070-0107, Washington, D.C. 20503.
                                         169

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 INSTRUCTIONS FOR "COMPLETING THE DATA CALL-IN RESPONSE FORMS
 Generic and Product Specific Data Call-In
 Item 1.       ON BOTH FORMS: This item identifies your company name, number and
              address.

 Item 2.       ON BOTH FORMS: This item identifies the case number, case name, EPA
              chemical number and chemical name.

.Item 3.       ON BOTH FORMS: This item identifies the type of Data Call-In.  The
              date of issuance is date stamped.

 Item 4.       ON BOTH FORMS: This item identifies the EPA product registrations
              relevant to the data call-in.  Please note that you are also responsible for
              informing the Agency of your response regarding any product that you
              believe may be covered by this Data Call-In but that is not listed by the
              Agency in Item 4. You must bring any such apparent omission to the
              Agency's attention within the period required for submission of this response
              form.

Item 5.       ON BOTH FORMS: Check this item for each product registration you wish
             to cancel voluntarily. If a registration number is listed for a product for
             which you previously requested voluntary cancellation, indicate in Item 5 the
             date of that request. Since this Data Call-In requires both generic and
             product specific data, you must complete item 5 on both Data Call-In
             response forms.  You do not need to complete any item on the Requirements
             Status and Registrant's Response Forms.
                                           i
Item 6a.      ON THE GENERIC DATA FORM: Check this Item if the Data Call-in is
             for generic data as indicated in Item 3 and you are eligible  for a Generic
             Data Exemption for the chemical listed in Item 2 and used in the subject
             product.  By electing this exemption, you agree to the terms and conditions
             of a Generic Data Exemption as explained in the Data Call-In Notice.

             If you are eligible for or claim a Generic Data Exemption,  enter the EPA
             registration Number of each registered source of that active ingredient that
             you use in your product.

             Typically, if you purchase an EPA-registered product from one or more
             other producers (who, with respect to the incorporated product, are in
             compliance with this and any other outstanding Data Call-In Notice), and
             incorporate that product into all your products, you may complete this item
             for all products listed on this form. If, however, you produce the active
             ingredient yourself, or use any unregistered product (regardless of the fact

                                        170

-------
            that some of your sources are registered), you may not claim a Generic Data
            Exemption and you may not select this item.

INSTRUCTIONS FOR COMPLETING THE DATA CALL-IN RESPONSE FORMS
Generic and Product Specific Data Call-In
Item 6b.      ON THE GENERIC DATA FORM: Check this Item if the Data Call-In is
             for generic data as indicated in Item 3 and if you are agreeing to satisfy the
             generic data requirements of this Data Call-In. Attach the Requirements
             Status and Registrant's Response Form that  indicates how you will satisfy
             those requirements.
                                   '";
             NOTE: Item 6a and 6b are not applicable for Product Specific Data.

Item 7a.      ON THE PRODUCT SPECIFIC DATA FORM: For each manufacturing
             use product (MUP) for .which you wish to maintain registration, you must
             agree to satisfy the data requirements by responding "yes."

Item 7b.      For each end use product (EUP) for which you wish "to maintain registration,
             you must agree to satisfy the data requirements by responding "yes."

             FOR BOTH MUP and EUP products

             You should also respond "yes" to this item (7a for MUP's and 7b for EUP's)
             if your  product is identical to another product and you qualify for a data
             exemption.   You must provide the EPA registration numbers of your
             source(s); do not complete the Requirements Status and Registrant's
             Response form.  Examples of such products include repackaged products arid
             Special Local Needs (Section 24c) products  which are identical to federally
             registered products.

             If you are requesting a data waiver, answer  "yes" here; in addition, on the
             "Requirements Status and Registrant's Response" form under Item 9, you
             must respond with option 7 (Waiver Request) for each study for which you
             are requesting a waiver.

             NOTE:  Item 7a and 7b are not applicable for Generic Data.
                                        171

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 INSTRUCTIONS FOR" COMPLETING THE DATA CALL-IN RESPONSE FORMS
 Generic and Product Specific Data Call-In
 Item 8.       ON BOTH FORMS:  This certification statement must be signed by an
              authorized representative of your company and the person signing must
              include his/her title. Additional pages used in your response must be
              initialled and dated in the space provided for the certification.

 Item 9.       ON BOTH FORMS:  Enter the date of signature.

 Item 10,     ON BOTH FORMS:  Enter the name of the person EPA should contact with
              questions regarding your response.

 Item 11.     ON BOTH FORMS:  Enter the phone number of your company contact.
  Note;
        You may provide additional information that does not fit on this form in a signed letter that accompanies your response. For example, you may
        wish to report that your product has already been transferred to another company or that you have already voluntarily cancelled this product. For
        these cases, please supply all relevant details so that EPA can ensure that its records are correct.
  Instructions For Completing The "Requirements Status and Registrant's Response
              Forms" For The Generic and Product Specific Data Call-In
INTRODUCTION

       These instructions apply to the Generic and Product Specific "Requirements Status
and Registrant's Response Forms" and are to be used by registrants to respond to generic
and product specific Data Call-in's as part of EPA's reregistration program under the
Federal Insecticide, Fungicide,  and Rodenticide Act.  If you are an end-use product
registrant only and have been sent this DCI letter as part of a RED document you have
been sent just the product specific "Requirements Status and Registrant's Response
Forms." Only registrants responsible for generic data have been sent the generic data
response forms. The type of Data Call-In (generic or product specific) is indicated in
item number 3 ("Date and Type of DCI") on each form.

       Although the form is the same for both product specific and generic data,
instructions for completing the forms differ slightly.  Specifically, options for satisfying
product specific data requirements do not include (1) deletion of uses or (2) request for a
low volume/minor use waiver.  Please read these instructions carefully before filling out
the forms.
                                          172

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       EPA has developed these forms individually for each registrant, and has preprinted
 these forms to include certain information unique to this chemical. DO NOT use these
Jforms for any other active ingredient.

       Items 1 through 8 have been preprinted oh the form. Item 9 must be completed by
 the registrant as appropriate.  Items 10 through 13 must be completed by the registrant
 before submitting a response to  the Agency.                                 -      •    .

       The public reporting burden for this collection of information is estimated to  :
 average 30 minutes per response, including time for reviewing instructions, searching
 existing data sources, gathering and maintaining the data needed, and completing and
 reviewing the collection of information. Send comments .regarding the burden estimate or
 any other aspect of this.collection of information, including suggestions for reducing this
 burden, to Chief,  Information Policy Branch, Mail Code 2136, U.S. Environmental
 Protection Agency, 401  M St., S.W., Washington, D.C. 20460;  and to the Office of
 Management and Budget, Paperwork Reduction Project 2070-0107, Washington, D.C.
 20503.
                                        173

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   INSTRUCTIONS FOR COMPLETING THE "REQUIREMENTS STATUS AND
                     REGISTRANT'S RESPONSE FORMS"

Generic and Product Specific Data Call-In
Item 1.      ON BOTH FORMS: This item identifies your company name, number and
            address.

Item 2.      ON THE GENERIC DATA FORM: This item identifies the case number,
            case name, EPA chemical number and chemical name.

            ON THE PRODUCT SPECIFIC DATA FORM: This item identifies the
            case number, case name, and the EPA Registration Number of the product
            for which the Agency is requesting product specific data.

Item 3.      ON THE GENERIC DATA FORM: This item identifies the type of Data
            Call-In.  The date of issuance is date stamped.

            ON THE PRODUCT SPECIFIC DATA FORM: This item identifies the
            type of Data Call-in. The date of issuance is also date stamped.  Note the
            unique identifier number (ID#) assigned by the Agency.  This ID number   "
            must be used in the transmittal document for any data submissions in
            response to this Data Call-In Notice.

Item 4.      ON BOTH FORMS: This item identifies the guideline reference number.of
            studies required. These guidelines, in addition to the requirements specified
            in the Data Call-in Notice, govern the conduct of the required studies.  Note
            that series 61 and 62 in product chemistry are now listed under 40 CFR
            158.155 through 158.180, Subpartc.

Item 5.      ON BOTH FORMS: This item identifies the study  title associated with the
            guideline reference number and whether protocols and 1,2, or 3-year
            progress reports are required to be submitted in connection with the study.
            - As noted in Section  III of the Data Call-in Notice, 90-day progress reports
            are required for all studies.

            If an asterisk appears in Item 5, EPA  has attached information relevant to
            this guideline reference number to the Requirements Status and Registrant's
            Response Form.
                                       177

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   INSTRUCTIONS FOR COMPLETING THE "REQUIREMENTS STATUS AND
                      REGISTRANT'S RESPONSE FORMS"

Generic and Product Specific Data Call-In

Item 6.       ON BOTH FORMS: This item identifies the code associated with the use
             pattern of the pesticide.  In the case of efficacy data (product specific
             requirement), the required study only pertains to products which have the use
             sites and/or pests indicated.  A brief description of each code follows:

             A     Terrestrial food
             B     Terrestrial feed
             C     Terrestrial non-food
             D     Aquatic food
             E     Aquatic non-food outdoor
             F     Aquatic non-food industrial
             G     Aquatic non-food residential
             H     Greenhouse food
             I      Greenhouse non-food crop
             J      Forestry
             K     Residential
             L     Indoor food
             M     Indoor non-food
             N     Indoor medical
             O     Indoor residential

Item 7.       ON BOTH FORMS: This item identifies the code assigned to the substance
             that must  be used for testing. A brief description of each code follows:
             EUP
            •MP
             MP/TGAI

             PAI
             PAI/M
             PAI/PAIRA

             PAIRA
             PAIRA/M
             PAIRA/PM

             TEP
             TEP    %
            TEP/MET
End-Use Product
Manufacturing-Use Product
Manufacturing-Use Product and Technical Grade Active
Ingredient
Pure Active Ingredient
Pure Active Ingredient and Metabolites
Pure Active Indredient or Pute Active
Ingredient Radiolabelled
Pure Active Ingredient Radiolabelled
Pure Active Ingredient Radiolabelled and Metabolites
Pure Active Ingredient Radiolabelled and Plant
Metabolites
Typical End-Use Product
Typical End-Use Product, Percent Active Ingredient
Specified
Typical End-Use Product and Metabolites
                                       178

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Item 8.
             TEP/PAI/M

             TGAI
             TGAI/PAI

             TGAI/PAIRA.

             TGAI/TEP

             MET
             IMP
             DEGR
             *
                                Typical End-Use Product or Pure Active Ingredient and
                                Metabolites
                                Technical Grade Active Ingredient
                                Technical Grade Active Ingredient or Pure Active
                                Ingredient        .
                                Technical Grade Active Ingredient or Pure Active
                                Ingredient Radiolabelled
                                Technical Grade Active Ingredient or Typical End-Use
                                Product                  .
                                Metabolites
                                Impurities
                                Degradates
                                See: guideline comment
             This item completed by the Agency identifies the time frame allowed for
             submission of the study or protocol identified in item 5.

             ON THE GENERIC DATA FORM: The time frame runs from the date of
             your receipt of the Data Call-In notice.

             ON THE PRODUCT SPECIFIC DATA FORM: The due date for
             submission of product specific studies begins from the date stamped on the
             letter transmitting the Reregistration Eligibility Decision document, and not
             from the date of receipt.  However, your response to the Data Call-In itself
             is due 90 days from the date of receipt.

Item 9.       ON BOTH FORMS: Enter the appropriate Response Code or Codes to
             show how you intend to comply with  each data  requirement. Brief
             descriptions of each code follow. The Data Call-In Notice  contains a fuller
             description  of each of these options.

      Option 1.    ON BOTH FORMS: (Developing Data) I will conduct a new study
                   and submit it within the time frames specified in item 8 above. By
                   indicating that I have chosen this option, I certify that I will comply
                   with all the requirements pertaining to the conditions for submittal of
                   this study as outlined in the Data Call-In Notice and that I will
                   provide the protocols and progress reports required  in item 5 above.

      Option 2.    ON BOTH FORMS: (Agreement to Cost Share) I  have entered into
                   an agreement with one or more registrants to develop data jointly. By
                   indicating that I have chosen this option, I certify that I will comply
                   with all the requirements pertaining to sharing in the cost of
                   developing data as outlined in the Data Call-In Notice.
                                       179

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                    However, for Product Specific Data, I understand that this
              option is available for acute toxicity or certain efficacy data ONLY if
              the Agency indicates in an attachment to this notice that my product is
              similar enough to another product to qualify for this option. I certify
              that another party in the agreement is committing to submit or provide
              the required data; if the required study is not submitted on time, my
              product  may .be subject to suspension.

 Option 3.     ON BOTH FORMS:  (Offer to Cost Share) I have made an offer to
              enter into an agreement with one or more registrants to develop data
              jointly.  I am also submitting a completed "Certification of offer to
              Cost Share in the Development of Data" form. I am submitting
              evidence that I have made an offer to another registrant (who has an
              obligation to submit data) to share in the cost of that data. I ,am
              including a copy of my offer and proof of the other registrant's
              receipt of that offer.  I am identifying the party which is committing
              to submit or provide the required data; if the required study is not
              submitted on time, my product may be subject to suspension. I
        ,     understand that other terms under Option 3 in the Data Call-In Notice
              apply as well.

                    However, for Product Specific Data,  I understand that this
              option is available only for acute toxicity or certain efficacy  data and
              only if the Agency indicates in an attachment to this Data Call-In
              Notice that my product is similar enough to another product to qualify
              for this option.
                              '     '                           !    i
Option 4.     ON BOTH FORMS:  (Submitting Existing Data)  I will submit an
              existing  study by the specified due date that has never before been
              submitted to EPA. By indicating that I have chosen this option, I
              certify that this study meets all the requirements pertaining to the
              conditions for submittal of existing data outlined in the Data Call-In
              Notice and I have attached the needed supporting information along
              with this response.

Options.      ON BOTH FORMS: (Upgrading a Study) I will submit by the
              specified due date, or will cite data to upgrade a study that EPA has
              classified as partially acceptable  and potentially upgradeable. By
             indicating that I have chosen this option,  I certify that I have met all
             the requirements pertaining to  the conditions for submitting or citing
             existing data to upgrade a study described in the Data Call-In Notice.
             I am indicating on attached correspondence the Master Record
             Identification Nuriiber (MRID) that EPA has assigned to the data that
             I am citing as well as the MRID  of the study I am attempting to
             upgrade.

                                  180

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Option 6.     ON BOTH FORMS: (Citing a Study)  I am citing an existing study
             that has been previously classified by EPA as acceptable, core, core
             minimum, or a study that has not yet been reviewed by the Agency. If
             reviewed, I am providing the. Agency's classification of the study.

                   However, for Product Specific Data, I am citing another
             registrant's study. I understand that this option is available ONLY
             for acute  toxicity or certain efficacy data and ONLY if the cited study
             was conducted o'n my product, an identical product or a product
             which the Agency has "grouped" with one or more other products for
             purposes  of depending on the same data. I may also choose  this option
             if I am citing my own data. In either case, I will provide the MRID or
             Accession number (s).  If I cite another registrant's data, I will
             submit a completed "Certification With Respect To Data Citation
             Requirements" form.

FOR THE GENERIC  DATA FORM ONLY: The following three options
(Numbers 7, 8, and 9) are responses that apply only to the "Requirements
Status and Registrant's Response Form" for generic data.

Option 7.     (Deleting Uses)  I am attaching an application for amendment to my
             registration deleting the uses for which the data are required.

Option 8.     (Low Volume/Minor Use Waiver Request) I have read the statements
             concerning low volume-minor use data waivers in the Data Call-In
             Notice and I request a low-volume minor use waiver of the data
             requirement. I am attaching a detailed justification to support this
             waiver request including, among other things, all information
             required to support the request. I understand that, unless modified by
             the Agency in writing, the data requirement as stated in the  Notice
             governs.

Option 9.     (Request  for Waiver of Data) I have read the statements concerning
             data waivers other than lowvolume minor-use data waivers in the Data
             Call-In Notice and I request a waiver of the data requirement. I am
             attaching a rationale explaining why I believe the data requirements
             ,do not apply. I am also submitting a copy of my current labels. (You
             must also submit a copy of your Confidential Statement of Formula if
             not already on file with EPA). I understand that, unless modified by
             the Agency in writing, the data requirement as stated in the  Notice
             governs.                                .
                                 181

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       FOR PRODUCT SPECIFIC DATA: The following option (number 7) is a
       response that applies to the "Requirements Status and Registrant's Response
       Form" for product specific data.

       Option 7.    (Waiver Request) I request a waiver for this study because it is
                    inappropriate for my product. I am attaching a complete justification
                    for this request, including technical reasons,  data and references  to
                    relevant EPA regulations, guidelines or policies.  [Note: any
                    supplemental data must be submitted in the format required by P.R.
                    Notice 86-5]. I understand that this is my only opportunity to state the
                    reasons or provide information in support of my request. If the
                    Agency approves my waiver request, I will not be required to supply
                    the data pursuant to Section 3(c)  (2) (B) of FIFRA. If the Agency
                    denies my waiver request, I must choose a method of meeting the data
                    requirements of this Notice by the due date stated by this Notice. In
                    this case, I must, within 30 days-of my receipt of the Agency's
                    written decision, submit a revised "Requirements Status" form
                    specifying the option chosen. I also understand that the deadline for
                    submission of data as specified by the original Data Call-In notice
                    will not change.

Item 10.     ON BOTH FORMS: This iteih must be signed by an  authorized
             representative of your company. The person signing must include his/her
             title, and must initial and date all other pages of this form.

Item 11.     ON BOTH FORMS: Enter the date of signature.

Item 12.     ON BOTH FORMS: Enter the name of the person EPA should contact with
             questions regarding your response.

Item 13.     ON BOTH FORMS: Enter the phone number of your company contact.
   NOTE:
          You may provide additional information that does not fit on this form in a signed letter that accompanies this your response. For example, you
          may wish to report that your product has already been transferred to another company or that you have already voluntarily cancelled this
                                          182

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194

-------
 EPA'S BATCHING OF PRODUCTS CONTAINING ZINC PHOSPHIDE AS THE
 ACTIVE INGREDIENT FOR MEETING ACUTE TOXICITY DATA
 REQUIREMENTS FOR REREGISTRATION

    In an effort to reduce the time, resources and number of animals needed to fulfill the
 acute toxicity data requirements for reregistration of products containing the active  ,
 ingredient zinc phosphide, the Agency has batched products which can be considered similar
 .in terms of acute toxicity. Factors considered in the sorting process include each product's
 active and inert ingredients (identity, percent composition and biological activity), product
: form (liquid, paste, solid, etc.), and labeling (e.g., signal word, precautionary labeling, etc.).

   Using available information, batching has been accomplished by the process described in  -
 the preceding paragraph. Notwithstanding the batching process, the Agency reserves the
 right to require, at any time, acute toxicity data for an individual product should the need
 arise.

    Registrants of products within a batch may choose to cooperatively generate, submit or
 cite a single battery of six acute lexicological studies to represent  all the products within that
 batch. It is the registrants' option to participate in the process with all other registrants, only
 some of the other registrants, or only  their own products within a batch, or to generate all the
 required acute lexicological studies for each of their own products. If a registrant chooses to
 generate the data for a batch, he/she must use one of the products within the batch as the test
 material. If a registrant chooses to rely upon previously submitted acute toxicity data, he/she
 may do so provided that the data base is complete and valid by today's standards (see
t acceptance criteria attached), the formulation tested is considered  by EPA to be similar for
 acute toxicity, and the formulation has not been significantly altered since submission and
 acceptance of the acute toxicity data.  TRB must approve any new formulations (that were
 presented to the Agency after the publication of the RED) before data derived from them can
 be used to cover other products in a batch. Regardless of whether new data is generated or
 existing data is referenced, registrants must clearly identify the test material by EPA
 Registration Number. If more than one confidential statement of formula (CSF)' exists for a
 product, the registrant must indicate the formulation actually tested by identifying the
 corresponding CSF.

    In deciding how to meet the product specific data requirements, registrants must follow "
 the directions given in the Data Call-In Notice and its attachments appended to the RED. The
 DCI Notice contains two response forms which are to be completed and submitted to the
 Agency within 90 days of receipt. The  first form, "Data Call-In Response," asks whether the
 registrant will meet the data requirements for each product. The second form,
 "Requirements Status and Registrant's Response," lists the product specific data required for
 each product, including the standard six acute toxicity tests.  A registrant who wishes to
 participate in a batch must decide whether he/she will provide the  data or depend on
 someone else to do so.  If a registrant supplies the data to support a batch of products, he/she
 must select one of the following options: Developing Data (Option 1), Submitting an
                                          195

-------
Existing Study (Option 4), Upgrading an Existing Study (Option 5) or Citing an Existing
Study (Option 6).  If a registrant depends on another's data, he/she must choose among: Cost
Sharing (Option 2), Offers to Cost Share (Option 3) or Citing an Existing Study (Option 6).
If a registrant does not want to participate in a batch, the choices are Options 1, 4, 5 or 6.
However, a registrant should know that choosing not to participate in a batch does not
preclude other registrants in the batch from citing his/her studies and offering to cost share
(Option 3) those studies.
Table 1 displays the batches for the active ingredient zinc phosphide.

Table 1,
Batch
1
2
3
4

5
Registration
Number
769-741
61282-3
769-656
769-743
4221-11
12455-24
61282-13
769-756
56228-6
1 56228-9
ID91001800
TX95000200
7173-197
12455-16
4-152
Percent Active Ingredient
zinc phosphide ... 94%
zinc phosphide ...93%
zinc phosphide ...80%
zinc phosphide ...80%
zinc phosphide ... 80%
zinc phosphide ... 80%
zinc phosphide ...82%
zinc phosphide ...62%
zinc phosphide ...63.2%
zinc phosphide ...63.2%
zinc phosphide ... 63.2%
zinc phosphide ... 63.2%
zinc phosphide ...10.3%
zinc phosphide ...10.0%
zinc phosphide ...2%
Form
powder
powder
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
                                         196

-------




4-285
30-25
192-204
192-205
322-8
358-165
814-9
2393-185
2393-521
. 2393-522
4271-16
5887-179
, 7122-124
7173-195
12455-17
'12455-18
12455-30
12455-59
12455-85
13808-6
36029-10
36029-12
36029-13
zinc phosphide ...2%
zinc phosphide ... 2%
zinc phosphide ... 2%
zinc phosphide " ...2%
zinc phosphide ... 2%
zinc phosphide ... 2%
zinc phosphide ...2%
zinc phosphide ... 2%
zinc phosphide ... 2%
zinc phosphide ...2%
zinc phosphide ... 1.82%
zinc phosphide ... 2%
zinc phosphide -...2%
zinc phosphide ...1.88%
zinc phosphide ... 2%
zinc phosphide . ...2%
zinc phosphide - ... 2%
zinc phosphide • ...2%
zinc phosphide ... 2%
zinc phosphide . ...2%
zinc phosphide ...2%
zinc phosphide ...2%
zinc phosphide ... 2%
solid
solid
solid'
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
197

-------
56228-3
56228-14
61282-14
61282-20
CA89002600
CA89002700
HI96000700
IL97000100
IN83000300
KS97000100
KY96000500
MO96001400
MT89000900
MT95000300
NE97000100
OH85000100
OR95002100
TX95000200
VT90000200
WA9 1000300
WA9 100 1800
WA95002200
WY92000200
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide.
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
zinc phosphide
... 1.82%
... 2%
... 2%
... 2%
... 1%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
... 2%
• ...2%
'... 2%
... 2%
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
solid
198

-------
         WY92000300   zinc phosphide
... 2%
solid
There was no "No Batch" group for this RED.
                                      199

-------
       The following is a list of available documents for Zinc phosphide that my further assist
you in responding to this Reregistration Eligibility Decision document.  These documents may
be obtained by the following methods:

Electronic                         •
File format:  Portable Document Format (.PDF) Requires Adobe® Acrobat  or compatible
             reader.  Electronic copies can be downloaded from the internet using WWW
             (World Wide Web) at www.epa.gov/REDs.

       1.     PR Notice 86-5.

       2.     PR Notice 91-2 (pertains to the Label Ingredient Statement).

       3.     A full copy of this RED document.
                     \
       4.     A copy of the fact sheet for zinc phosphide.


       The following documents are part of the Administrative Record for Zinc phosphide and
may included in the  EPA's Office of Pesticide Programs  Public Docket. Copies of these
documents are not available electronically, but may be obtained by contacting the person listed
on the Chemical Status Sheet.

       1.     Health and Environmental Effects Science Chapters.

      2.     Detailed Label Usage Information System (LUIS) Report.

      The following Agency  reference documents are not  available electronically, but may
be obtained by contacting  the  person listed on  the Chemical  Status Sheet of this RED
document.

       1.     The Label Review Manual.

      2.     EPA Acceptance Criteria
                                        200

-------
Instructions for Completing the Confidential Statement of Formula

The Confidential Statement of Formula (CSF) Form 8570-4 must be used. Two legible, signed
copies of the form are required.  Following are basic instructions:

      a.     All the blocks on the form must be filled in and answered completely.

      b.     If any block is  not applicable, mark it N/A.

      c.     The CSF must be signed, dated  and the telephone number of the responsible
             party must be provided.                 .     ,                   .
                • .     - - -          v         "     •          i          •
      d.     All applicable  information which is on the product specific data submission
             must also be reported on the CSF.

      e.     All weights reported under item 7 must be in pounds per gallon for liquids and
             pounds per cubic feet for solids.    •

      f.     Flashpoint must be in degrees Fahrenheit and flame extension in inches.

      g.     For all active ingredients,  the EPA Registration Numbers for the currently
            .registered source products must be reported under column 12.

      h.     The Chemical Abstracts Service (CAS) Numbers for all'actives and inerts and
             all common names for the trade names must be reported.

      i.      For the'active ingredients,  the percent purity of the source products must be
             reported under column 10 and must be exactly  the same as on the source
            product's  label.

     j.     All the weights in columns  13.a.  and 13.b. must be in pounds, kilograms, or
            grams. In no case will volumes be accepted. Do  not mix English and metric
            system units (i.e., pounds and kilograms).

     k.    All the items under column 13.b. must total 100 percent.

      1.    All items under columns 14.a.  and 14-b.  for the active ingredients  must
            represent pure active form.

     m.    The upper and  lower certified limits for ail active and inert ingredients must
            follow the 40 CFR 158.175 instructions. An explanation must be provided if the
            proposed limits are different than standard certified limits.

     n.    When  new CSFs are submitted and approved, all previously submitted CSFs
            become obsolete for that specific  formulation.
                                       201

-------
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Instructions for Completing the Confidential Statement of Formula

The Confidential Statement of Formula (G.SF) Form 8570-4 must be used. Two legible, signed
copies of the form are required.  Following are basic instructions:
      a.

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      f.

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      1.
 All the blocks on the form must be filled in and answered completely.

 If any block is not applicable, mark it N/A.

 The CSF must be signed, dated and the telephone number of the responsible
 party must be provided.
      d.    All applicable information which is on the product specific data submission
            must also be reported on the CSF.
 All weights reported under item 7 must be in pounds per gallon for liquids and
 pounds per cubic feet for solids.

 Flashpoint must be in degrees Fahrenheit and flame extension in inches.

 For all active ingredients, the EPA Registration Numbers for the currently
 registered source products must be reported under column 12.

 The Chemical Abstracts Service (CAS) Numbers for all .actives and inerts and
 all common names for the trade names must be reported.

 For the active ingredients, the percent purity of the source products must be
 reported under column  10 and must be exactly the same as on the source
 product's label.
 All the weights in columns 13.a. and 13.b. must be in pounds, kilograms, or
 grams. In no case will volumes be accepted.  Do not mix English and metric
 system units (i.e., pounds and kilograms).

 All the items  under column 13.b. must total 100 percent.

 All items under columns 14.a. and 14.b. for the active ingredients must
 represent pure active form.
     m.    The upper and lower certified limits for ail active and inert ingredients must
            follow the 40 CFR 158.175 instructions. An explanation must be provided if the
            proposed limits are different than standard certified limits.
     n.
When new CSFs are submitted and approved, all previously submitted CSFs
become obsolete for that specific formulation.
                                      203

-------
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             \
United States Environmental Protection Agency
             Washington,  D.C. 20460
      Certification of Offer to Cost
   Share in the Development of Data
  Form Approved
OMB No. 2070-0106,
    2070-0057
 Approval Expires
     3-31-99
Public reporting burden for this collection of information is estimated to average 15 minutes per response,
 ncluding time for reviewing instructions, searching existing data sources, gathering and maintaining the data
needed, and completing and reviewing the collection of information. Send comments regarding the burden
estimate or any other aspect of this collection of information, including suggestions for reducing this burden to, .
Chief Information Policy Branch, PM-233, U.S. Environmental Protection Agency, 401 M St., S.W., Washington, DC
20460; and to the Office of Management and Budget, Paperwork Reduction Project (2070-0106), Washington, DC
20503.

Please fill in blanks below:
Company Name
                                                                                Company Number
'roduct Name
                                                                                EPA Reg. No.
 Certify that:

Wly company is willing to develop and submit the data required by EPA under the authority of the Federal
nsecticide, Fungicide and Rodenticide Act (FIFRA), if necessary. However my company would prefer to
»nter into an agreement with one or more registrants to develop jointly or share in the cost of developin"
   a.

i/ly firm has offered in writing to enter into such an agreement. That offer was irrevocable and included
m an offer to be bound by arbitration decision under section 3(c)(2)(B)(iii) of FIFRA if final agreement on
all terms could not be reached otherwise. This offer was made to the following firms on the following
date(s):
Name of Firm(s)
                                                                                Date of Offer
Certification:

I certify that I am duly authorized to represent the company named above, and that the statements that \ have made
on this form and all attachments therein are true, accurate, and complete. I acknowledge that any knowingly false
or misleading statement may be punishable by fine or imprisonment or both under applicable law.
Signature of Company's Authorized Representative
                                                                                Date
Mame and Title (Please Type or Print)
   orm 8570-32 (5/91) Replaces EPA form 8580 which is obselete
                                                                             Form Approved OMB No. 2070-0060
                                                207

-------
208

-------
                                       UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                                                               401 M Street, S.W.
                                                        WASHINGTON, D.C. 20460
   aperwork Reduction Act Notice: The public reporting burden for this collection of information is estimated to average 1,25 hours per response for
 registration and 0.25 hours per response for reregistration and spe'cial review activities, including time for reading the instructions and completing the
 necessary forms.  Send comments regarding burden estimate or any'other aspect of this collection of information, including suggestions for reducing th
 burden to: Director, OPPE Information Management Division (2137), U.S. Environmental Protection Agency, 401 M Street, S W Washington DC
 20460.                                                     '                                      .                       .
 Do not send the completed form to this address.
                                         Certification with Respect to Citation of Data
 Applicant's/Registrant's Name, Address, and Telephone Number
                                                                                  EPA Registration Number/File Symbol
 Active Ingredient(s) and/or representative test compourid(s)
                                                                                  Date
 General Use Pattern(s) (list  all those claimed for this product using 40 CFR Part 158),
                                                                                  Product Name
 NOTE: If your product is a 100% repackaging of another purchased EPA-registered product labeled for all the same uses on your label, you do not neec
 to submit this form. You must submit the Formulator's Exemption Statement (EPA Form 8570-27).
 D
I am responding  to a Data-Call-in Notice, and have included with this form.a list of companies sent offers of compensation (the Data Matrix forn
should be used for this purpose).                          -
                                     SECTION I: METHOD OF DATA SUPPORT (Check one method only)
      .  I am using the cite-all method of support, and have included with this
        form a list of companies sent offers of compensation (the Data Matrix
        form should be used for this purpose).
                                                                        I am using the selective method of support (or cite-all option
                                                                        under the selective method), and have included with this form
                                                                        a completed list of data requirements (the Data Matrix form
                                                                        must be used).
                                                 SECTION II: GENERAL OFFER TO PAY
 [Required if using the cite-all method or when using the cite-all option under tne selective method to satisfy one or more data requirements]

 I	|   I hereby offer and agree to pay compensation, to other persons, with regard to the approval of this application, to the extent required by FIFRA.
                                                      SECTION III: CERTIFICATION
         I certify that this application for registration, this form for reregistration, or this Data-Call-in response is supported by all data submitted or
cited in the application for registration, the form for reregistration, or the Data-Call-in response. In addition, if the cite-all option or cite-all option under
the selective method is indicated in Section I, this application is supported by all data in the Agency's files that (1) concern the properties or effects of
this product or an identical or substantially similar product, or one or more of the ingredients in this product; and (2) is a type of data that would be
required to be submitted under the data requirements in effect on the date of approval of this application if the application sought the initial registration o
a product of identical or similar composition and uses .

         I certify that for each exclusive use study cited in support of this registration or reregistration, that I am the originaldata submitter or that I hav
obtained  the written permission of the original data submitter to cite that study.                  '

         I certify that for each study cited in support of this registration or reregistration that is not an exclusive use study, either: (a) I am  the original
data submitter; (b) I have obtained the permission of the original data submitter to use the study in support of this application; (c) all periods of eligibility
for compensation have expired for the study; (d) the study is in the public literature; or (e) I have notified in writing the company that submitted the study
and have offered (I) to pay compensation to the extent  required by sections 3(c)(1)(F) and/or 3(c)(2)(B)'of FIFRA; and (ii).to commence negotiations to
determine the amount and terms of compensation, if any, to be paid for the use of the study.

         I certify tha't in all instances where an offer of compensation is required, copies of all offers to pay compensation and evidence of  their delivery
in accordance with  sections 3(c)(1)(F) and/or 3(c)(2)(B) of FIFRA are available and will be submitted to the Agency upon request.  Should I fail to
produce such evidence to the Agency upon request, I understand that the Agency may  initiate action to deny, cancel or suspend the registration of my
product in conformity with FIFRA.  ,                                    ,                                                 .

         I certify that the statements I have made on this form and all attachments to it are true, accurate, and complete.  I acknowledge that
any knowingly false or misleading statement may be punishable by fine or imprisonment or both under applicable law.
^nature ~
Date
Typed or Printed Name and Title .
Jf\ rorm H3/U-J4 (9-9/) tiectronic and Paper versions available. Submit only Paper version.
                                                                  209

-------
210

-------

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INSTRUCTION? 1 DATA MATRIX
jenfify afl data submitted orded and all submitters from whom permissk «s been received or to whom offers to pay hav
Irix (photocopy and attach additional pages as necessary). Complete all columns; omission of essential information will de
[erthe dale, Applicant's/Registrant's name, EPA Registration Number or application file symbol of the product, ingredie
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MRID Number columns after the registration/reregistration of this product has been granted or once this form is received in
the Guideline Reference Number, Guideline Study Nameand MRID Number columns is available through the Freedom c
ber.
fy the active ingredient(s) in this product for which dta are cited. The active ingredient(s) are to be identified by entering the i
for each separate active ingredient for which data are cited. If bridging data from a related chemical or representative test
ntative test compound including the EPA Registration Number/File Symbol if appropriate.
i-all method is used for all data supporting this particulaingredient, enter "CITE-ALL" in the Guideline Reference Number
he cite-all method is used for a particular Guideline Reference Number enter "CITE-ALL" in the MRID Number column on 1
;r all submitters to whom offers to pay have been sent on subsquent lines. [Note: if the selective method of support is used z
idividual Guideline Reference Number, Guideline Study Name, and MRID Number columns must still be completedtDthei
rence Number: Enter on separate lines in numerical order the Guideline Reference Numbers from 40 CFR Pa
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