PESTICIDE RINSATE
RECYCLING FACILITIES
DESIGN GUIDE
POLLUTION PREVENTION PAYS PROGRAM
NORTH CAROLINA DEPARTMENT OF NATURAL RESOURCES AND COMMUNITY DEVELOPMENT
James G. Martin
Governor, North Carolina
S. Thomas Rhodes
Secretary, NRCD
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June 1988
PESTICIDE RINSATE RECYCLING FACILITIES
by
Terry Ambroz
Minnesota Agricultural Aircraft Association
Prior Lake, MN 55372
Project Officer
James S. Bridges
Office of Environmental Engineering and Technology Demonstration
Hazardous Waste Engineering Research Laboratory
Cincinnati, OH 45268
This study was conducted through
Minnesota Waste Management Board
St. Paul, MN 55108
and the
Minnesota Technical Assistance Program
University of Minnesota
Minneapolis, MN 55455
REPRINTED
BY PERiVMSS.'CW
HAZARDOUS WASTE ENGINEERING RESEARCH LABORATORY
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
CINCINNATI, OH 45268
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This project was partially supported with a United States
Environmental Protection Agency cooperative agreement through the
Minnesota Waste Management Board and the Minnesota Technical
Assistance Program.
Although the research described in this report has been funded in
part by the United States Environmental Protection Agency through
a cooperative agreement, it has not been subjected to Agency
review, and therefore does not necessarily reflect the views of
the Agency and no official endorsement should be inferred.
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FINAL REPORT
PESTICIDE RINSATE FACILITIES
REVIEW DRAWING
NOT TO BE USED FOR CONSTRUCTION
DATE OF ISSUE 8-17-87
AUGUST, 1987
Prepared through the cooperation of the
following agencies:
- Minnesota Agricultural Aircraft Association
-"Minnesota Plant Food & Chemicals Association
- U.S. Environmental Protection Agency
- Minnesota Technical Assistance Program
- Minnesota Department of Agriculture
- Minnesota Pollution Control Agency
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TABLE OP CONTENTS
Section Paqe
I. INTRODUCTION 1
II. DESIGN CRITERIA 2
III. SYSTEM REQUIREMENTS 3
IV. ADDITIONAL CONSIDERATIONS 4
a. Rain Water Discharge 4
1. Permanent Roof 4
2. Moveable Roof 4
3. Rain Water Storage 5
4. Rain Water Discharge 6
b. Containment 7
c. Slab Size 7
d. Mixing Tanks 7
e. Water Service 8
f. Electrical Service 8
g. Storage Tanks 8
h. Future Roof 8
i. Underground Storage 8
j. Gravity Discharge 8
k. Drainage 9
1. Sump 9
m. Employee Safety 9
V. OPERATION AND MAINTENANCE OF SYSTEM 9
a. Training of Personnel 9
b. Labelling of Tanks 10
c. Lock Valves 10
d. Keep Records 10
e. Sediment Removal 10
f. Minimize Water Use 10
g. Minimize Storage Time 11
h. Water Reuse 11
i. Proper Flushing of System 11
j. Reuse of Rinsate 11
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TABLE OF CONTENTS (Cont'd.)
Section Page
k. Disposal of Sediment in System 12
1. Cracks 12
m. Drain System 12
VI. CONSTRUCTION ESTIMATES 13
VII. EQUIPMENT AND OPERATION MODIFICATIONS 14
a. On-Site Cleaning 14
b. Water Reduction 14
c. Tank Modifications 15
d. Field Collection 15
e. Nozzle Selection 16
f. Safety Hazards 17
g. Discharge Path 17
VIII. CONCLUSIONS 17
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FINAL REPORT
PESTICIDE RINSATE FACILITIES
Abstract: The problem of managing pesticide rinsate
materials is described and discussed. A Report and
generic plan are presented for the design of a reuse
facility which is generally compatible with current
Minnesota operational and regulatory requirements. The
generic design incorporates recommendations for facility
size, construction materials, rinsate storage volumes,
reuse scheduling, and operation and maintenance proce-
dures. With proper site-specific modifications, the
facility is considered to be adaptable to many facility
locations.
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PESTICIDE RINSATE FACILITIES
The disposal, treatment or reuse of pesticide rinsate water
has been the subject of much research and on-going debate.
Pesticide loading and mixing facilities are located
throughout the state and vary substantially from one location
to another. Facility operators recognize the importance of
proper rinsate handling and have requested assistance with
the design and construction of rinste handling facilities.
This report and accompanying plan provides general
information and design considerations to assist in the
construction of better and environmnetally safer rinsate
handling facilities. The information included herein was
prepared by Bolton & Menk, Inc. for the Minnesota
Agricultural Aircraft Association and Minnesota Plant Food
and Chemicals Association through the Minnesota Technical
Assistance Program with a grant from the U.S. Environmental
Protection Agency.
The primary goal and purpose of this project was to develop
and discuss a generic rinsate facility design to:
- collect rinsate and wash water
- minimize site run-off
- provide short-term reuse of rinsate and wash water
- minimize extraneous water run-on
Further, the design has been planned to be generally afford-
able and reasonably simple to construct and maintain. These
conditions are necessary to assure a transition to improved
facilities by operators.
Numerous regulations and rules govern pesticide handling, use
and disposal. As part of this project, several meetings and
review sessions were held with representatives of all of the
participating agencies. The basic purpose of this regulatory
review was to determine the status of rinsate facilities
relative to current regulations, enforcement procedures and
rule interpretations.
During this review, many possible design alternates were
considered including contingencies for dealing with possible
long-term site contamination. Based upon proper site
operation, short-term storage periods and rinsate
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reuse/recycling, the resultant design and report has
generally been accepted by the participating review agencies
as a reasonable method of handling short-term rinsate and
wash water.
Operators should be aware that failure to properly maintain
and operate the rinsate facility, improper discharges, use
for long-term storage and other activities may ultimately
categorize the facility as a hazardous waste generator. This
may subject the operator to expensive clean-up procedures,
long haul disposal and possible fines. Further, rules and
interpretations are subject to change.
It is the intent of the design to satisfy the maximum number
of regulatory rules and concerns and, yet, maintain a
relatively simple and easy to operate system. Other designs
and options are available. This project has shown that no
design, including the selected generic design, is without
some faults. It is, ultimately, up to the operator to insure
that its facility is being operated in compliance with appli-
cable regulations and in accordance with appropriate site
requirements.
The facility has been designed to attempt to minimize most
or all of the chemicals which are released from the facility.
The slab area has been designed of concrete because it is the
material which is most resistant to chemical attack of the
commonly available construction materials.
The potential for frost heaving and damage to the concrete
surface is always present in the Minnesota environment. The
use of drains in the granular base could reduce this
possibility, but the potential for chemical infiltration into
the under drain system is felt to be too much of a risk to
take. For this reason, no underdrains are shown on the
drawings.
One of the areas which was discussed during the preparation
of the plan and report was the need for a plastic liner and
subdrain under the gravel base (leachate collection system)
in order to collect any chemicals which pass through the
cracks in the concrete surface. Such a system would include
drainage pipes in the gravel base to remove the leachate from
the gravel. The construction cost for the leachate system is
estimated to range from $2,000 to $3,000. Collected leachate
may require special handling and disposal, depending upon
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pesticide concentrations, quantities and migration. At this
time, participating regulatory agencies are not requiring
rinsate facilities in Minnesota to have leachate collection
systems. However, a leachate collection system may be a
requirement on future installations if careful attention is
not paid to sealing of concrete cracks and minimizing
intrusion of chemicals into the surrounding soil. In light
of possible future leachate requirements, operators may wish
to consider addition of leachate collection piping and fabric
during initial construction.
The facility has been designed to contain large volumes of
rinsate material or rainwater which falls on the slab area.
Curbs have been built into the concrete surface to facilitate
the storage.
The concrete slab thickness has been designed to attempt to
carry the average size vehicles which are used in these
applications under normal soil conditions. Unusual loads or
unusual soil conditions will necessitate the use of varying
concrete thicknesses.
The amount of piping which is used in the system has been
minimized. Piping and valves appear to be an ever-present
problem area and their use is discouraged. Frost heaving of
the shallow pipe system may cause the pipes to break and
chemicals to be released.
Many other designs and configurations are possible depending
upon the use of the facility. Careful consideration should
be given to all details prior to commencing construction.
* SiSIEM REQUIREMENTS.
The need, configuration and size of a rinsate facility will
be largely dependent upon the individual operation. It is to
the operator's advantage to attempt to minimize the amount of
rinsate material which must be handled and reused. Several
available articles stress the importance of first determining
the necessity of constructing a permanent rinsate facility.
A rule of thumb, contained in the literature, is that a
business which operates with less than 300 equipment hours
per year will find that rinsing and disposing of the dilute
chemical over the application field is more economical than
constructing a permanent facility.
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IY.1. ADDITIONAL CONSIDERATIONS^
After the decision has been made to construct a permanent
rinsate facility, several other considerations should be
taken into account in the planning stages. Several of these
are addressed below:
Rain HaJtej; Discharges
One of the most major decisions which must be made by
the operator is how to handle rain water which falls on
the concrete slab. Rain water will constitute a large
volume of water, with a one inch rain on the aerial
spray slab amounting to over 2,500 gallons. Thus it is
important to develop a plan for handling this water
early in the planning stages. Several options for the
operator were discussed during the review meetings
between the involved agencies. These options are pre-
sented below:
LJ. Permanent Roof;
The preferred method of dealing with rain water is
to direct it away before it comes in contact with
the slab and possibly becomes contaiminated. This
is best accomplished by providing a roof over the
slab area. Such a roof could be of pole-shed type
construction spanning over the entire slab. A
roofing system will not be adaptable for helicopter
use. Roofs for such uses should be designed to meet
the minimum loads required by the local building
code for commercial applications. Cost of a roofing
system may range from $3,000 to $15,000, depending
upon size and construction.
2... Moveab'le Roof L
Another method for directing rain water away from
the slab would involve placing a moveable roof over
the slab during periods when -the facility is not in
use. The roofing system could range from a solid
pole-shed type on a track system which could be
rolled in and out of position to a simple light-
weight frame which could be carried into position
and a tarp placed over the framework. Even a series
of barrels placed under the tarp may suffice to
direct water off of the tarp.
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Whatever method of tarp support is selected, the
tarp should not come into contact with the concrete
slab during use - this contact with the slab will
contaminate the underside of the tarp. The rinsate
tank area may not be adaptable to covering by this
method since the tanks will be in the way of tarp
placement. Water falling on this area will need to
be collected in the sump and pumped into a rinsate
tank or directly into the application equipment.
Cost of a moveable roof system could range from $400
for a simple tarp system to $8,000 or more for a
roll-away roof.
Bain SJaie.£ Storages
Storage of all rain water which falls on the slab is
another possibility for the operator. This option
will be more appeal ling to the ground applicators
since they are using larger volumes of water to mix
at lower concentrations, and thus need more mixing
water. The rain water could be transferred to
storage tanks by pumping or could be left on the
slab, and pumped directly into application equipment
or mixing tanks as it is used.
The ground application slab is designed to contain a
3-1/2 inch rain on the slab, which amounts to about
2,200 gallons. As such the operator must either
provide sufficient storage for this volume of water
or know that his operation will make use of this
much water in a short period of time. If this
volume of rinsate is used in the recommended propor-
tion of 5 percent rinsate to 95 percent clean water,
approximately 44,000 gallons of mixing water will
result, all from one 3-1/2 inch rainfall. The cost
of providing this additional storage during the
initial construction will be relatively cheap, but
the operator must have a good plan for disposing of
this extra water without storing it for long periods
of time.
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Bain Water
All of the previous methods for dealing with rain
water have either diverted the water away from the
slab before it comes into contact with it or have
contained the contaminated water. Another alterna-
tive is to discharge the rain water from the slab
area after it has fallen on the slab. This is shown
graphically on the plan sheet by the pipes which
lead from the sump to a ground discharge.
This method of disposal will only be acceptable to
the Department of Agriculture and the Pollution
Control Agency if the operator maintains a very
clean site and avoids any release of chemicals from
the slab. This will require that the rinsate slab
be rinsed off after each day's use, or prior to an
impending rainfall. The discharge pipe must lead to
an above-ground discharge point and not be connected
to a sewer or tile line. The discharge point must
be an area which is seeded or sodded to grasses.
This will allow a visual check of the discharge
characteristics and the effect of the discharge on
the vegetation. The key to this arrangement is that
no grass may be killed or stressed by the discharge
flow. The operator will need to effectively rinse
the pad/ as stated earlier, after each use.
Another possibility for avoiding rain-slab contact
is to install a tarp cover directly on top of the
slab. Rain could be collected on top of the tarp
and removed by pumping or by siphon action prior to
use of the slab.
The drawback of this option is that the bottom side
of the tarp will be in contact with the contaminated
slab, and will thus also come into contact with the
trace of chemicals contained on the slab. For this
reason, when the tarp is removed from the slab it
will need to be pulled completely off of the slab
with bottom side up, and then folded over so that
the contaminated sides are together and the top does
not become contaminated. Simply rolling the tarp
will result in the bottom to top contact which con-
taminates the top and makes the top vulnerable to
rain water carrying the chemicals off of the slab.
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The important consideration as stated, is that no
chemicals are released from the slab. No vegetation
may be killed adjacent to the site. If improper
operational procedures or dead vegetation are
noticed by inspectors at the site, a change in
design and operation will be required. Discharge
piping will probably be required to be completely
plugged and complete containment or diversion of all
rain water will become a necessity.
The concrete slab of a rinsate facility provides an
excellent spill prevention site and has containment
capacity for locating bulk chemical containers and
mixing tanks. If bulk facilities are to be utilized,
locate them on or near to the rinsate slab and provide
containment around the bulk facilities as required by
state law.
Bulk facilities may necessitate special permitting and
secondary containment requirements be met. These items
should be carefully considered before utilizing the
facility for such use.
The size of the facility has been selected to fit the
average size of equipment in use. It has also been
assumed that the ground equipment in use is capable of
having its spray bars washed out in the folded position.
If equipment size or operations vary, or if new equip-
ment is likely to change the operation in the future, it
may be wise to change the pad size or shape to accomo-
date these variations.
d.*. nixing Tanks;
Consider siting mixing tanks on the rinsate slab or
directly adjacent to contain any potential spills
generated in this operation. The plans show areas
adjacent to the slab which could be used for this
purpose. Other size modifications of the slab may be
advantageous to provide this additional use area.
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fij. Water Service;
If onsite water is needed, provide a water service of
adequate capacity to the mixing area with' an approved
air gap to prevent back contamination of the water
supply.
Electrical Service;
If needed, supply electrical power to the slab area to
run electrical pumps and power washers.
Storae
Determine the number of storage rinsate tanks which will
be required to meet the individual operational needs.
This number will depend upon the chemical varieties
being used and the time of year of their application.
The Minnesota Department of Agriculture recommends that
one storage tank be installed for each crop on which
pesticides are applied. Avoid any label violations by
mixing inappropriate chemicals.
Future
Consider siting the pad in a area suitable for future
placement of a roof over the slab if a roof is not built
immediately. A roof will direct rain water off of the
slab area, and can serve as protection for equipment
from long-term weather damage.
Underground Storage;
Avoid the use of any underground storage tanks or
vessels. The Environmental Protection Agency may
require that any underground facility include double
containment of the stored liquids, monitoring for any
leaks, and extensive testing around such vessels.
Gravity Discharge;
If the elevation of the site allows, consider directing
the rinsate into the storage tanks by gravity rather
than pumping. This is shown on the detail on the
ground-based plan sheet. Containment around the storage
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tanks for this material will be required. This method
obviously has advantages in that the liquid does not
have to be pumped twice.
Ji*. Drainage;
Design the area around the rinsate pad so that all
drainage will run away from the slab. Never slope an
area to drain onto the pad.
The collection sump could be a pre-cast unit, made
either from precast concrete pipe sections with a
precast base, or precast to the size and shape as drawn.
Waterstops should be installed at all joints. Also, a
stainless steel tank could be used for this sump if it
came equipped with a top flange to assure a good water-
tight connection to the slab concrete. Check with local
suppliers for availability.
HU. Employee Safety^
Provide for employee safety and sanitation needs as
required by pesticide regulatory requirements and OSHA.
Showers and eye wash facilities should be considered as
required by these agencies.
AUQ MAINTENANCE Q£ SYSTEM
In order for the rinsate facility to be effective and remain
in compliance with all agency laws/ proper maintenance and
operational techniques must be adopted by the user. The
following points are necessary considerations which must be
addressed by the operator.
a*. Training of. Personnel;
All employees who will be loading or cleaning equipment
must be familiar with the operation of the system.
Special time should be set aside to adequately prepare
all personnel for the operation of the system to avoid
any label violations or potential damage claims.
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b_». Labelling of Tanks;
All tanks, whether contai
rinsates, or mixing tankSi
as to their contents. If rinsate tanks are to contain
more than one chemical type, this should also be noted
rS M ^ V» f± 1 ^ V>^ 114 V* fm
Lning bulk pesticide, pesticide
, should be adequately labelled
„ .. „ w. A F rin ca h » <• a n 1^ c a r o ^ n /-•« n +• a i n
... v*^ ........ >-.._ ,,..pni i r>a1 h
on the labelling.
G.J. Lgck Valves:_
All valves on the system and on the storage tanks should
be capable of being locked. This will avoid inadvertent
operation both by employees and by vandals.
Records;
A record should be kept of the approximate concentration
of chemicals in each storage tank. If a spill of con-
centrated chemical should occur on the slab, this should
be carefully accounted for in the records, and the
material adequately diluted for further reuse. Sampling
and testing for chemical concentrations may be necessary
to establish safe reuse rates.
Sj. Sediment Removals
Build-up and disposal of dirt and sediment in the system
will need to be regularly addressed by the operator.
One way of substantially reducing the amount of this
sediment is to remove as much of it as possible in the
field before bringing the vehicle back to the rinsate
facility. This can be accomplished by means of physical
removal of the dirt or by use of water pressure.
!_,. Minimize
Every attempt should be made to minimize the amount of
water which must be handled in the rinsate facility.
Handling the rinsate material will cost money, and any-
thing which can be done to minimize the volume handled
will save the operator money. Consideration should be
given to use of a pressurized power washing system for
cleaning of equipment, rather than using water indis-
criminately from the water supply. Also, the regulatory
agencies do not at this time require that water used for
washing off the exterior of application equipment be
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collected in the cinsate facility if it does not result
in accumulation of chemicals in the soil. This will
also minimize the amount of dirt and sediment which
enters the storage tanks. Do not wash the equipment in
the same place consistently to avoid the build-up of
chemical contamination.
Sioia.se.
An attempt should be made to reuse rinsate water as
quickly as possible following storage. Long-term
storage of rinsate may subject the operator to the
requirements of the EPA concerning hazardous waste gen-
eration. Also, quick reuse may help to reduce the
amount of sediment which settles out and is collected in
th e sy st em .
ljL Water
Rinsate water should never be stored when there is not
expected to be a time when this material can be reused.
Attention to future spraying jobs and schedules will
help to minimize this problem. Every attempt should be
made to rid the system of rinsate prior to the end of
the spray season. This is especially true when cold
weather sets in. All rinsate must be removed from the
storage tanks, pump, hoses and sump and reused prior to
freezing temperatures to avoid frost damage to these
apparatus.
L*. Proper Flushing fif System;
After each use of the rinsate facility, all surfaces
which have come in contact with rinsate material must be
adequately washed. This includes the collection slab,
sump, pump, hoses, and cleaning equipment.
Reuse af Rinsate;
The rinsate water should be reused with the same
chemical or a compatible chemical application. The rate
of reuse of rinsate recommended by the Department of
Agriculture is 5 percent with 95 percent clean water (1
part rinsate with 19 parts clean water). As noted
earlier, this reuse rate will result in large volumes of
make-up water if rain water is collected.
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Qi£fi££3l fii Sedimgnt iD Systems
Over time, sediment and deposits are sure to collect in
the pumping sump and the storage tanks. The regulatory
agencies have a major concern about the disposal of this
material. In order to be in strict compliance with all
hazardous waste laws, the material should be analyzed to
determine its chemical constituents and concentrations.
If the material contains higher concentrations than is
allowed, it would be considered a hazardous waste and
would need to be placed in an acceptable vessel and
shipped to a suitable hazardous waste containment
facility. As a consequence, every attempt should be
made to minimize the amount of sediment which enters the
system. This will include washing the exterior of the
application equipment off of the slab whenever possible.
Consideration should be given to agitation of the sedi-
ment material at frequent time intervals and reapplica-
tion of this solution as a dilution material. This may
cause problems with some application equipment, but
appears to be the most reasonable method of disposal at
this time.
Another possibility appears to be land spreading of this
material so as to minimize any high concentrations in
any one pi ace .
Cracks t.
Contraction joints and random cracks which develop in
the concrete surface roust be sealed routinely to prevent
water and chemical intrusion. Also, control joints
which are cut into the concrete surface during construc-
tion must be cleaned and resealed about every five
years, or as often as the material seems to pull away
from the concrete. The cracks should first be sawed or
routed to remove old sealing material and debris, and
then sealed with a chemical resistant poured sealing
material. See the plans for a sealing material
reference. A detail for sealing of cracks is included
at the rear of this report.
m*. Drain Systems
Prior to cold weather all tanks, piping and pumps must
be drained completely to avoid frost damage and the
rinsate reused. The sump area should be sealed to avoid
water entry into the sump and the outlet piping.
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.•. CONSTRUCTION
The estimated cost of constructing these cinsate systems has
been prepared. Construction costs will vary substantially,
depending upon the cost of local materials and availability
of competent local contractors. Also, many applicators will
elect to do a large portion of the work themselves, which
will affect the projected costs.
GROUND APPLICATOR
Soil Testing $ 1,500.00
Site Engineering 1,300.00
Concrete: 25 C.Y. @ $55/C.Y. 1,375.00
Forming, Reinforcing & Labor 1,800.00
Excavation 230.00
Gravel Base: 25 Tons @ $6/Ton 150.00
Storage Tanks 1,300.00
Pump and Hose 600.00
Electrical Work 400.00
TOTAL 5 8,655.00
AERIAL APPLICATOR
Soil Testing $ 1,500.00
Site Engineering 1,600.00
Concrete: 70 C.Y. @ 555/C.Y. 4,345.00
Forming, Reinforcing & Labor 5,800.00
Excavation 900.00
Gravel Base: 150 Tons @ $6/Ton 900.00
Storage Tanks 820.00
Pump and Hose 350.00
Electrical Work 300.00
TOTAL $ 16,515.00
In addition to the costs shown on the above estimates, other
considerations could affect the final total construction
cost. These include:
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If the present electrical or water services are not in
the vicinity of the facility, the cost to run these
services to an accessable point.
If a connecting road or access point needs to be
constructed, the cost of this additional work.
The cost for rainwater protection, storage or removal
must be added into the above estimates. As stated
earlier, this cost may be as low as $100 for rainfall
which is directed off the site by a discharge pipe, to
as high as $15,000 for a permanent roof.
ju EQUIPUEUT MQ OPERATION MODIFICATIONS.
Several potential modifications to existing equipment or
operations have been identified during the course of this
investigation. These modifications could help to reduce the
amount of unused chemical and the amount of rinsate material
which needs to be handled.
S^. Qn-Site Cleaning;
As pointed out earlier, a small applicator using a
minimum amount of equipment may find the investment in a
permanent rinsate facility to be prohibitive. One of
the options which is available instead of the use of the
fixed facility is to rinse all tanks and spray bars in
the field. For ground applicators this can be accomo-
dated by bringing a container of clean water to the
site. For aerial applicators and ground applicators,
several manufacturers have systems available which can
be mounted to supply a quantity of clean water on the
aplication rig. This container is filled during the
final application load, and is then used to rinse the
tank and spray bars over the field. Rinsate concentra-
tions should be considered in calculating overall appli-
cation rates to avoid excessive dosing or label viola-
tions.
Water Reduction;
As mentioned earlier, every attempt should be made to
reduce the amount of water which needs to be collected
in the rinsate system. The use of a power washer or
other means of increasing the pressure and decreasing
the amount of water used is recommended.
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Modifications;
The amount of mixed chemical left in the application
equipment should be minimized wherever possible.
Several manufacturers supply a "goose neck" type of
apparatus to pick up as much remaining chemical in the
dump box area of an aircraft as possible. The approxi-
mately 1 to 5 gallons of dilute chemical that would
otherwise be wasted in this area is then able to be
used. This device is shown on the drawing below.
Perhaps similar modifications are possible for ground
based applicators also.
AIRCRAFT SPSAY TANK
AIRCRAFT SPRAY TANK
Figure 1 - Unmodified
chemical pick-up.
Figure 2 - "Goose
neck" to pick up
greater amount of
mixed chemical.
Collection;
Mobile applicators without a fixed base rinsate facility
may need to adapt a simple method to collect rinsate in
the field during cleaning operations. A very simple
system is shown in the following sketch which allows
collecting rinsate from washing of the spray bar. This
system will work best if the two spray bars are valved
independently and cleaned one at a time under reduced
pressure. The collected rinsate material will run into
a small container beneath the aircraft or truck.
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Disposal of the collected rinsate will be similar to
that for fixed base operators. The material can be
pumped from the container beneath the equipment to a
storage tank on a vehicle. If a fixed base rinsate
facility is available, the material can be hauled to
this facility and transferred to other storage or reuse
containers. If this facility is not available, the
material can be used in a mixing tank on the mobile rig
at the prescribed reuse rate.
The exterior of the equipment could be washed and the
water not collected, unless the site is used repeatedly
and a chemical build-up is possible.
Container— Pump from
Htr» to Storage ^Partial Stcfjan of li"
flattie
Spray Monti
Install indwdint Valves en Both
Spray Ban so Out Sidt eon bo
Gtmmd at t Time.
A suitable container could be used beneath the spray or
dump tank to collect rinse water from the tank area.
g.j. Nozzle Selection;
Spray bars on all equipment should be equipped with
"suck -back" nozzles which will close completely when the
equipment is running and producing a vacuum. This will
help to prevent any dripping from leaky nozzles.
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* Safety
Applicators should police their facilities and be aware
of potential hazards. Particular care should be taken
around outlets and valves from bulk storage facilities,
mixing tanks and rinsate storage tanks. A vandal or the
collision of a passing vehicle could easily break these
connections and allow the spillage of massive amounts of
chemicals. Simple safety precautions beforehand could
easily avoid this type of problem.
Discharge
The operator should note the drainage paths from all
facilities. Dikes and diversions which can either slow
or eliminate the entry of spilled chemicals into storm
sewer systems, lakes or rivers may be cheap insurance to
avoid future accidents, and regulatory action.
i. CONCLUSIONS.
Pesticide rinsate handling and reuse has become a major
concern of regulatory agencies and environmental groups. In
order to stay in compliance with the laws governing rinsate
generation and reuse, the applicator must take positive steps
toward collecting and disposing of this material. The system
shown on these plans and discussed in this report attempts to
deal with these issues in a cost effective manner.
Because the field of pesticide handling is a relatively new
science, changes may be made in the future in the way
chemicals are handled and applied, or rinsates collected.
The applicator should begin immediately to plan for present
and future needs in a rinsate facility and to dedicate
financial resources to the proposed improvements. The future
view of regulatory agencies toward pesticide applicators may
be largely influenced by the ability of the operators to
control all their wastes and make a dedicated effort to
comply with all regulations.
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