Comparison Of Existing Water Quality Criteria And Standards With Living Resources Habitat Requirements


CBP/TRS 32/89
August 1989
A Comparison of Existing
Water Quality Criteria and
Standards with Living Resources
Habitat Requirements
Chesapeake
Bay
Program

-------
A Comparison of Existing Water Quality
Criteria and Standards with
Living Resources Habitat Requirements
A report prepared by the
Criteria and Standards Workgroup
of the Chesapeake Bay Program's
Living Resources Subcommittee
August 1989
Printed by the United States Environmental Protection Agency
for the
Chesapeake Bay Program

-------
CONTENTS
MEMBERS OF CRITERIA AND STANDARDS WORKGROUP	1
CHARGE TO THE WORKGROUP	1
WORKGROUP ACTIVITIES	1
GENERAL RECOMMENDATIONS	2
SPECIFIC RECOMMENDATIONS BY PARAMETERS	2
Conventional Parameters	3
Metals	5
Biocides	6
Other Organic Chemicals	7
ATTACHMENTS
A.	Water Quality Criteria Summary	8
Criteria Proposed by EPA for Development in the Near Future	15
Advisories/Criteria Proposed by EPA for Development in the
Near Future	16
B.	Schedule for Triennial Reviews of Water Quality Standards	17
C.	Worksheets for the Comparison of Water Quality Criteria and
Standards with Chesapeake Bay Habitat Requirements	18
Notes About Jurisdictional Policies	19
EPA Criteria: Temperature	20
Virginia Water Control Board: Site-specific Temperature
Requirements	22
Water Quality Standards/Criteria Comparison with Habitat
Requirements	23
iii

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MEMBERS OF CRITERIA AND STANDARDS WORKGROUP
Ms. Linda Andreasen, U.S. Fish & Wildlife Service
Mr. Richard Bariuk, EPA-Chesapeake Bay Liaison Office
Ms. Sheila Besse, D.C. Gov't. Water Quality Management
Mr. Alan E. Pollock, Virginia Water Control Board - (Chairman)
Mr. Jim Ulanoski, Pennsylvania Dept. of Environment Resources
Mr. John Veil, Maryland Dept. of Environment
Mr. Kenneth Weaver, Maryland Geological Survey
Mr. Ken Yetman, Maryland DNR - Tidewater Administration
CHARGE TO THE WORKGROUP
The workgroup was charged with comparing existing water quality criteria and
standards with the water quality requirements found in the Chesapeake Bay Program
document, Habitat Requirements For The Chesapeake Bay Living Resources. Based on
this comparison, recommendations for the possible improvement of existing criteria and
standards were to be made as were any recommendations for the periodic updating of the
Habitat Requirements document.
WORKGROUP ACTIVITIES
The workgroup met on November 13, 1987 and on January 15, 1988. At the first
meeting, Mr. Frank Gostomski, Chief of EPA's Criteria and Standards Branch, explained
EPA's criteria development program. Attachment A includes a table of the existing EPA
water quality criteria along with a listing of the advisories and criteria EPA proposes for
development in the near future. As required by the Clean Water Act, the jurisdictions must
review and revised as appropriate their water quality standards every three years.
Attachment B presents the schedule for these triennial reviews for each of the Bay
jurisdictions.
Prior to the second meeting, a series of worksheets were developed which presented
each of the water quality parameters discussed in the Habitat Requirements document
(Attachment Q. Each worksheet contains the relevant criteria and standards of each
jurisdiction along with the habitat requirements of individual species. These worksheets
were discussed and a variety of issues were raised.
For some parameters, the EPA criteria is either missing or insufficient to protect the
target species of the Habitat Requirement document. One reason for this is that EPA has
certain minimum data requirements which must be met before criteria are developed and for
some parameters, the required data may not be available. Another reason as stated in,
Quality Criteria for Water. EPA 440/5-86-001, is that: "Water quality criteria are not
intended to offer the same degree of strategy for survival and propagation at all times to all
organisms". Therefore, the most sensitive organisms may not be protected by some EPA
criteria. In such cases, the EPA recommends that special standards be considered based on
the presence of sensitive species.
For many other parameters, the existing EPA criteria, as well as the water quality
standards adopted by the jurisdictions are more stringent than the numbers in the Habitat

-------
Requirements document. This is due primarily to the differences in the approaches used in
developing the criteria versus the habitat requirements. The EPA criteria are based upon
data derived from a large number of species which may include species more sensitive to
the chemical than the species targeted in the Habitat Requirements document
GENERAL RECOMMENDATIONS
Examination of the existing standards and criteria in conjunction with the Habitat
Requirements document yielded several general recommendations:
1. Information about existing water quality criteria and standards should be
incorporated into future revisions of the Habitat Requirements document. The
appropriate criteria or standards can either be incorporated into the matrices of
individual species or listed in an appendix to allow users of the document easy
reference to this information.
2. The Habitat Requirements document should be used to assist the jurisdictions in
assessing whether regional water quality standards should be adopted. The
document should not be used as the sole rationale for changing water quality
standards.
3. More specific references should be included in the Habitat Requirements document
for each toxic parameter value listed in the Habitat matrices. In the present
document, it is difficult to determine the sources of some of the toxicity information.
4. Parameters should be examined to determine the need for and feasibility of varying
habitat requirements based on salinity. The toxicity of several metals varies based on
the ambient salinity.
5. Participating agencies in the Chesapeake Bay Monitoring Program should reassess
the adequacy of their present monitoring programs with reference to the parameters
listed in the Habitat Requirements document and existing criteria and standards.
6. Any product ban or restriction on the use of a toxic material should be mentioned.
This would alert users of the document regarding the potential for the introduction of
that pollutant into the environment
SPECIFIC RECOMMENDATIONS BY PARAMETERS
There are specific recommendations that can be made about individual parameters. For
practicality and ease of discussion, the individual parameters are divided into four groups:
conventional parameters, metals, biocides, and other organic chemicals. Each of these
groups presents different situations concerning the feasibility of developing useful water
quality objectives, criteria or standards. The remainder of the report contains brief
summaries of the workgroup's findings about specific parameters along with
recommendations based upon these findings.
2

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CONVENTIONAL PARAMETERS
1. Temperature
EPA has a complicated process for the development of Temperature criteria. All
jurisdictions have adopted simplified criteria that are probably sufficient to protect the
target species. Pennsylvania has a new standard under development that is more
ecologically realistic than most existing standards. This standard takes into account
various life stages of fish species as well as seasonal changes in ambient temperatures.
It is recognized that this approach may be difficult to implement and enforce.
Recommendation: Other jurisdictions should examine the approach
Pennsylvania is considering.
2. Light Related Parameters (Turbidity. Secchi depth, light intensity, light extinction
coefficient fkdl. suspended solids')
These parameters are important water quality indicators. Research has shown that
many of the ecological problems in the Bay are related to declining light quality.
Presently, there is some consideration given to these parameters in management
programs through the following means:
1. B MP's are targeted to areas with highly erodible land.
2. Many jurisdictions have local ordinances which govern erosion and sediment
control practices.
3. There are suspended solids and color limits in many NPDES permits.
4. Water quality planners are generally aware of the importance of these parameters.
However, at the present time, there is little focus on using these parameters as criteria
or standards. Developing meaningful or implementable standards may be a difficult
task. These parameters are often a function of natural causes and can be highly variable
in both time and space. Furthermore, they are largely related with non-point source
dominated problems and criteria and standards programs are traditionally more useful in
dealing with point source problems.
Recommendation: Further consideration needs to be given to whether these
parameters can be used by management agencies as standards, criteria, or "guidelines".
Improvements in the understanding and usefulness of these parameters would allow
agencies to focus BMP's in areas where impacts on water clarity has been demonstrated
rather than on the potential for pollution (i.e. areas with highly erodible land). Also,
improve information would be valuable to water quality planners.
3. Chlorophyll
There are presently no chlorophyll criteria/standards though it is widely recognized as
an important water quality variable. It is a highly variable biological parameter and
deleterious levels are very site specific. For these reasons, it may be difficult to
develop as a standard. However, it is still valuable as an "indicator" of areas with
potential water quality problems. Virginia has used chlorophyll as the primary basis for
3

-------
for designating "nutrient enriched waters" in its proposed water quality standard. The
designation of "nutrient enriched waters" is then used as justification for the
implementation of management strategies.
Recommendation: Research should focus on approaches that may be used to
determine deleterious levels of chlorophyll under estuarine conditions at varied
salinities.
4. Dissolved Inorganic Nitrogen. Dissolved Inorganic Phosphorus
These parameters are also good "indicators" of areas with potential water quality
problems. There are currently no criteria or standards for these parameters. It would
be very difficult to develop any because of the high natural variability and the very
confounding influences of biological cycling. Most jurisdiction are presently
attempting to control nitrogen and phosphorus without the use of criteria and standards
(through phosphate bans, NPDES permits, BMPs). Pennsylvania uses mathematical
modeling and a "trophic index" for determining allowable phosphorus loadings to
freshwater systems.
Recommendation: Applied research should focus on linking excessive levels of
Dissolved Inorganic Nitrogen and Dissolved Inorganic Phosphorus to the decline of
submerged aquatic vegetation and as causal factors in the shift in planktonic community
structures from diatoms toward less desirable smaller sized dinoflagellates and
cyanobacteria.
5. Dissolved Oxygen. Ph. Salinity
The current criteria and standards for these parameters are sufficient to protect the target
species. EPA has recendy revised the dissolved oxygen criteria.
Recommendations: The jurisdictions should consider the revised water quality
criteria for dissolved oxygen during their next triennial reviews.
6. Alkalinity
Only Pennsylvania has adopted criteria for alkalinity.
Recommendation: Virginia, Maryland and the District of Columbia should
examine the need for adoption of alkalinity standards.
7. Total Hardness
No criteria or standards for hardness have been adopted by EPA or any of the
jurisdictions.
Recommendation: Virginia, Maryland, Pennsylvania, the District of Columbia and
EPA should examine the need for the development of criteria/standards for total
hardness.
8. Chlorine
The criteria and standards that exist are probably sufficient. Pennsylvania is the only
jurisdiction with no criteria although new advanced treatment candidates are required to
4

-------
provide facilities for dechlorination. In Pennsylvania, a chlorine criteria is also
imposed in specific situations where it has been determined that chlorine is impacting
designated stream uses.
Recommendation: Pennsylvania should reexamine the need to adopt standards for
chlorine.
METALS
1.	Cadmium
The existing criteria/standards may not be protective of striped bass. This is
acknowledged in EPA's criteria.
Recommendation: Jurisdictions should examine the need for adoption of special
cadmium standards for striped bass spawning areas.
2.	Zinc
All jurisdictions except Maryland have adopted criteria or standards. The present
criteria/standards, though lower than EPA criteria, are close to the levels that would
harm hard clams. Zinc anodes on boats may be a significant source of zinc.
Recommendation: Research should focus on examination of the possible impact
of zinc in hard clam grounds. Maryland should examine the need to adopt Zinc
standards.
3.	Aluminum
Pennsylvania is the only jurisdiction with any standard. Aluminum is of concern in
striped bass spawning areas. EPA has a draft document in preparation.
Recommendation: Jurisdictions should consider the adoption of standards when
EPA criteria are available.
4.	Nickel
All jurisdiction except Maryland have criteria or standards. These criteria and standards
may not protect white perch.
Recommendation: Further examination of the information on the toxicity of nickel
should be conducted. Jurisdictions should consider the need to adopt special nickel
criteria for white perch habitats.
5.	Manganese
Pennsylvania and Virginia have sufficient standards.
Recommendation: Maryland and the District of Columbia should examine the need
for adoption of manganese standards.
5

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6. Silver. Mercury. Copper, and Lead
EPA criteria and sufficient state standards exist for all these parameters in
Pennsylvania, Virginia, and the District of Columbia.
Recommendation: Maryland should examine the need for adoption of state
standards for silver, mercury, copper and lead.
BIOCIDES
Herbicides and pesticides present difficulties for the setting of meaningful and
enforceable criteria and standards. Monitoring for these compounds is difficult because of
the non-point source nature of the input and the episodic timing of the input. Some of these
compounds are already banned or their use restricted.
1. Aldrin. Toxaphene. and Dieldrin
Sufficient criteria exist for these compounds.
2. Endrin
Sufficient criteria exist for these compounds.
Recommendation: Information concerning the banning or restricted use of any of
these compounds should be incorporated into the Habitat Requirements document.
3. Atrazine
Pennsylvania is the only jurisdiction with standards. However, the Pennsylvania
criteria may not be protective of the SAV.
Recommendation: Jurisdictions should consider the need for setting special
standards for atrazine to protect SAV habitats.
4. Paraquat and Diquat
Pennsylvania is the only jurisdiction with criteria.
Recommendation: Virginia, Maryland, and the District of Columbia should
examine the need for adoption of standards for Paraquat and Diquat.
5. Chlordane
Pennsylvania, Virginia, and the District of Columbia have sufficient standards.
Recommendation: Maryland should examine the need for Chlordane standards.
6. Malathion
Only Virginia and Pennsylvania have adopted criteria/standards for this compound.
6

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Recommendation: Maryland and District of Columbia should examine the need for
adoption of criteria/standards for Malathion.
7.	Dichlorophenoxv Acetic Acid
Pennsylvania is the only jurisdiction with standards.
Recommendation: Virginia, Maryland, and District of Columbia should examine
the need for adoption of standards.
8.	Trichlorophenoxv Acetic Acid
This compound effects striped bass and there are no criteria and standards adopted.
Recommendation: All jurisdictions should examine the need for the adoption of
criteria and standards for this compound.
9.	DDT
All jurisdictions have sufficient criteria.
10.	TBT
Pennsylvania has a chronic standard. The other jurisdictions are in the process of
developing standards.
Recommendation: Maryland, Virginia, and the District of Columbia should
continue their standard development process.
OTHER ORGANIC CHEMICALS
The input of these compounds is largely from point sources. Therefore, the adoption
of criteria and standards would aid in setting NPDES permit limits.
1.	Phenol
Only Virginia and District of Columbia have criteria.
Recommendation: Maryland and Pennsylvania should examine the need to adopt
criteria and standards. All jurisdictions should examine the expression and intent of
their criteria.
2.	Orthodichlorobenzene. Trichlorobenzene
Only Pennsylvania has criteria.
Recommendation: Virginia, Maryland, and District of Columbia should examine
the need to adopt criteria and standards. The LC50 for this compound is very high.
Monitoring data should be examined to see if environmental levels are high enough to
consider adoption of standards.
7

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ATTACHMENT A
WATER QUALITY CRITERIA SUMMARY
Nole: This chart is for general information; please use criteria documents or detailed summaries in "E.P.A. Quality Criteria for Water - 1986" for regulatory purposes.
January 2. 1987 CONCENTRATIONS IN ug/L UNITS PER LITER
ACENAPTHENE
ACROLEIN
ACRYLONITRILE
Priority
Pollutant
Y
Y
Y
Carcin-
ogen
N
N
Y
Fresh
Acute
Criteria
•1,700.
•68.
•7,550.
Fresh
Chronic
Criteria
•520.
•21.
2,600.
Marine
Acute
Criteria
•970.
•55.
Marine
Chronic
Criteria
•710.
Water
and Fish
Ingestion
320.ug
0.058ug
Fish Con-
sumption
Only
780.ug
0.65ug**
Drinking
Water
M.C.L.
Date/
Reference
1980FR
1980FR
1980FR
ft of States with
Aquatic Life
Standard
1
1
ALDRIN
AUKA UNITY
AMMONIA
Y
N
N
Y
N
N
3.0
CRITI
20,000.
RIA ARE pi
1.3
I AND TEW
PERATURE
0.074ng**
DEPENDEN
0.079ng*»
r-SEE DOCl
MENT
1980FR
1976RB
1985FR
16
24
ANTIMONY
ARSENIC
ARSENIC (PENT)
Y
Y
Y
N
Y
Y
•9,000.
•850.
•1,600.
•48.
•2,319.
•13.
146.ug
2.2ng**
45,000.ug
17.5ng**
0.05mg
1980FR
1980FR
1985FR
1
21
21
ARSENIC (TRI)
ASBESTOS
BACTERIA
Y
Y
N
Y
Y
N F
360.
OR PRIMA
190.
tY RECREj
69.
lTION ANC
36.
SHELLFIS
30kf/L**
I USES -SE
•DOCUMEN-
•
-------
ATTACHMENT A
CONCENTRATIONS IN wg/L
UNITS PER LITER

Priority
Carcin-
Fresh
Fresh
Marine
Marine
Water
Fish Con-
Drinking
Date/
# of States with

Pollutant
ogen
Acute
Chronic
Acute
Chronic
and Fish
sumption
Water
Reference
Aquatic Life

Criteria
Criteria
Criteria
Criteria
Ingestion
Only
M.C.L.

Standard
CHLORINATED

NAPHTHALENES
Y
N
~1.600.

•7.5

1980FR
1
CHLORINE
N
N
19.
11.
13.
7.5

1985FR
21
CHLOROALKYLETHER
5 Y
N
'238,000.

1980FR
1
CHLOROETHYL

ETHER (BIS-2)
Y
Y

0.03ug**
1.36ug#»

1980FR

CHLOROFORM
Y
Y
•28.900.
•1,240

0.19ug**
15.7ug**

1980FR
1
CHLOROISOPROPYL

ETHER (BIS-2)
Y
N

34.7ug
4.36mg

1980FR

CHLOROMETHYL

ETHER (BIS)
Y
N

0.00000376ng** 0.00184ug»*
1980FR

CHLOROPHENOL 2
Y
N
•4.380.
•2,000.

1980FR
1
CHLOROPHENOL 4
N
N

•29.700.

1980FR
1
CHLOROPHENOXY

HERBICIDES (2,4,5,-TP) N
N

10.ug

1980FR

CHLOROPHENOXY

HERBICIDES (2,4-D)
N
N

100.ug

1976RB
7
CHLORPYRIFOS
N
N
0.083
0.041
0.011
0.0056

1986FR

CHLORO-4 METHYLr

3 PHENOL
N
N
•30

1980FR

CHROMIUM (HEX)
Y
N
16.
11.
1,100.
50.
50.ug

0.05mg
1985FR
24
CHROMIUM (TRJ)
N
N
1,700.+
210.+
•10.300.

170. mg
3,433.mg
0.05mg
1985FR
24
COLOR
N
N
NARR
ATIVE STA
TEMENT-S
EE DOCUK
ENT

1976RB

COPPER
Y
N
18 +
12.+
2.9
2.9

1985FR
20
CYANIDE
Y
N
22.
5.2
1.
1.
200.ug

1985FR
23
DOT
Y
Y
1.1
0.001
0.13
0.001
0.024ng**
0.024ng*»

1980FR
16
DDT METABOLITE (DDE) Y
Y
•1,050.

•14.

1980FR

DDT METABOLITE (TDE
:) Y
Y
•0.06

•3.6

1980FR

DEMETON
Y
N

0.1

1976RB

D1BUTYLPHTHALATE
Y
N

35.mg
154. mg

1980FR

DICHLOROBENZENES
Y
N
•1,120.
•763.
•1.970.

400. ug
2.6mg

1980FR
1
-------
ATTACHMENT A
CONCENTRATIONS IN ug/L
UNITS PER LITER

Priority
Carcin-
Fresh
Fresh
Marine
Marine
Water
Fish Con-
Drinking
Dale/
U of States with

Pollutant
ogen
Acute
Chronic
Acute
Chronic
and Fish
sumption
Water
Reference
Aquatic Life

Criteria
Criteria
Criteria
Criteria
Ingestion
Only
M.C.L.

Standard
DICHLOROBENZIDINE
Y
Y

O.Olug**
0.020ug*t

1980FR
1
D1CH LOROETHANE 1.2
Y
Y
•118,000.
•20,000.
•113,000.

0.94ug**
243.ug**

1980FR
1
D1CH LOROCTHYLENES
Y
Y
~11,600.

•224,000.

0.033ug#*
1.85ug"

1980FR
1
DICHLOROPHENOL 2.4
N
N
•2,020.
•365.

3.09mg

1980FR
1
DICHLOROPROPANE
Y
N
*23.000.
•5.700.
•10,300.
•3,040.

1980FR
1
D1CHLOROPROPENE
Y
N
~6,060.
•244.
~790.

87.ug
14.1mg

1980FR
1
D1ELDRIN
Y
Y
2.5
0.0019
0.71
.0019
0.071ng*#
0.076ng~~

1980FR
16
DIETHYLPHTHALATE
Y
N

350. mg
l-8g

1980FR

D1METHYLPHENOL 2.4
Y
N
~2,120.

1980FR

DIMETHYLPHTHALATE
Y
N

313. mg
2.9g

1980FR

DINITRCTTOLUENE 2,4
N
Y

0.1 lug"
9.1ug**

1980FR

DINITROPHENOLS
Y
N

70.ug
14.3mg

1980FR

DINITROrrOLUENE
N
Y
~330.
•230.
•590.
•370.

1980FR
1
DINITRO-O-CRESOL 2,4 Y
N

13.4ug
765.ug

1980FR

DIOXIN (2,3,7,8-TCDD)
Y
Y
~0.01
•0.00001

0.000013n
g** O.OOOC
>14ng"
1984FR
1
DIPHENYLHYDRAZINE
Y
N

42. ng**
0.56ug,<

1980FR
1
DIPHENYLHYDRAZ1NE 1.2 Y
N
~270

1980FR

M-2-ETHYLHEXYL

PHTHALATE
Y
N

15.mg
50.mg

1980FR

ENDOSULFAN
Y
N
0.22
0.056
0.034
0.0087
74.«g
159.ug

1980FR
10
ENDRIN
Y
N
0.18
0.0023
0.037
0.0023
lug

0.0002mg
1980FR
18
ETHYLBENZENE
Y
N
~32,00

~430

1.4mg
3.28mg
1980FR

FLUORANTJIENE
Y
N
~3,980.

~40.
~16.
42.ug
54.ug

1980FR
1
GASSES, TOTAL DIS-

SOLVED
N
N
NARRATIVE STATEMENT - SEE DOCUMENT

1976RB

GUTHION
N
N

031

1976RB
8
-------
ATTACHMENT A
CONCENTRATIONS IN ug/L

Priority
Carcin-
Fresh
Fresh
Marine

Pollutant
ogen
Acute
Chronic
Acute

Criteria
Criteria
Criteria
HALOETHERS
Y
N
•360
•122

HALOM ETHANES
Y
Y
*11.000.

•12,000
HEPTACHLOR
Y
Y
0.52
0.0038
0.053
HEXACHLOROETHANE
N
Y
~980.
•540.
•940.
HEXACHLOROBENZENE Y
N

HEXACHLOROBUTADIE
NE Y
Y
•90.
i
m |
o* '
•
•32.
HEXACHLOROCYCLO-

HEXANE (LINDANE)
Y
Y
2.0
0.08
0.16
HEXACHLOROCYCLO-

HEXANE- ALPHA
Y
Y

HEXACHLOROCYCLO-

HEXANE- BETA
Y
Y

HEXACHLOROCYCLO-

HEXANE - GAMMA
Y
Y

HEXACHLOROCYCLO-

HEXANE - TECHNICAL
Y
Y

HEXACHLOROCYCLO-

PENTADIENE
Y
N
•7.
•5.2
•7.
IRON
N
N

1,000.

ISOPHORONE
Y
N
*117.000.

•12.900.
LEAD
Y
N
82.+
3.2.+
140.
MALATHION
N
N

0.1

MANGANESE
N
N

MERCURY
Y
N
2.4
0.012
2.1
MCTHOXYCHLOR
N
N

0.03

MIREX
N
N

0.001

MONOCHLOROBENZEN
5 Y
N

NAPHTHALENE
Y
N
~2,300.
•620.
•2,350.
NICKEL
Y
N
1,400.+
160.+
75.
NITRATES
N
N

Marine
Chronic
Criteria
~6.400.
0.0036
S.6
0.1
0.025
0.03
0.001
8.3
UNITS PER LITER
Fish Con-
sumption
Only
15.7ug#*
0.29ng**
8.74ug
0.74ng»»
50.ug**
31.ng**
54.7ng**
62.5ng*»
41.4ng**
520.mg
lOO.ug
146.ng
lOO.ug
Drinking
Water
M.C.L.
0.004mg
0.05mg
0.002mg
0.1 mg
10.mg
Dale/
Reference
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1980FR
1976RB
1980FR
1985FR
1976RB
1976RB
1985FR
1976RB
1976RB
1980FR
1980FR
1986FR
1976RB
# of States with
Aquatic Life
Standard
12
1
2
12
3
15
20
7
7
17
12
7
1
10
5
-------
ATTACHMENT A
CONCENTRATIONS IN ug/L
UNITS PER LITER

Priority
Carcin-
Fresh
Fresh
Marine
Marine
Water
Fish Con-
Drinking
Date/
# of Slates with

Pollutant
ogen
Acute
Chronic
Acute
Chronic
and Fish
sumption
Water
Reference
Aquatic Life

Criteria
Criteria
Criteria
Criteria
Ingestion
Only
M.C.L.

Standard
NITROBENZENE
Y
N
•27.000.

•6,680.

19.8mg

1980FR
1
NITROPHENOLS
Y
N
•230.
•150.
•4,850.

1980FR
1
NITROSAMINES
Y
Y
•5,850

'3.300.00C

0.8ng**
1240.ng*»

1980FR
1
NITROSODIB ITTYLr

AMINE N
Y
Y

6.4ng**
587.ng**

1980FR

NITROSODIETHYL-

AM1NEN
Y
Y

0.8ng**
l,240.ng*«

1980FR

NITROSODIM ETH YL-

AMINEN
Y
Y

1.4ng**
16,000.ng**
1980FR

NITROSODIPHENYL-

AMINE N
Y
Y

4,900. ng**
16,100.ng**
1980FR

NITROSOPYRROLJDINEN Y
Y

16. ng**
91,900.ng**
1980FR

OIL AND GREASE
N
N
NARRATIVE STATEMENT - SEE DOCUMENT

1976RB
56
OXYGEN DISSOLVED
N
N
WARM WATER AND COLD WATER CRITERIA MAT}
UX - SEE DOCUMENT
1986FR
56
PARATHION
N
N
0.065
0.013

1986FR
8
PCB's
Y
Y
2.0
0.014
10.
0.03
0.079ng**
0.079ng**

1980FR
16
PENTACHLORINATED

ETHANES
N
N
•7,240.
•1,100.
•390.
•281.

1980FR
1
PENTACHLOROBENZENE N
N

74.«g
85.ug

1980FR

PENTACHLOROPHENOL
Y
N
•••20.
•••13.
13.
•7.9
1 .Olmg

1986FR
2
PH
N
N

6.5-9.0

6.5-8.5

1976RB
56
PHENOL
Y
N
•10,200.
•2,560.
•5,800.

3.5mg

1980FR
23
PHOSPHORUS ELEMENTAL N
N

0.1

1976RB

PHTHALATE ESTERS
Y
N
•940.
•3.
•2,944.
•3.4

1980FR
6
POLYNUCLEAR AROMATIC

HYDROCARBONS
Y
Y

•300.

2.8ng»»
31 ,lng»»

1980FR
1
SELENIUM
Y
N
260.
35.
410.
54.
lO.ug
0.01 mg
1980FR
15
-------
ATTACHMENT A
CONCENTRATIONS IN ug/L

Priori ly
Carcin-
Fresh
Fresh
Marine
Marine
Water
Fish Con-
Drinking
Date/
0 of States with

Pollutant
ogen
Acute
Chronic
Acute
Chronic
and Fish
sumption
Water
Reference
Aquatic Life

Criteria
Criteria
Criteria
Criteria
Ingestion
Only
M.C.L.

Standard
SILVER
Y
N
4.1 +
0.12
2.3

50.ug

0.05mg
1980FR
14
SOLIDS DISSOLVED

AND SALINITY
N
N

250. mg

1976RB
56
SOLIDS SUSPENDED

AND TURBIDITY
N
N
NARRATIVE STATEMENT - SEE DOCUMENT

1976RB
44
SULFIDE-HYDROGEN

SULFIDE
N
N

1976RB

TEMPERATURE
N
N
SPECIES DEPENDENT CRITERIA - SEE DOCUMENT

1976RB
56
TETRACHLOR1NATED

ETHANES
Y
N
•9.320.

1980FR

TETRACHLOROBEN-

ZENE 1.2.4.5
Y
N

38.Kg
48.ug

1980FR

TETRACHLOROETHANI

1.1.2.2
Y
Y

•2.400.
•9,020.

0.17«g**
10.7ug»»

1980FR
1
TETRACHLOROETHANES Y
|
N
*9,320.

1980FR
1
TETRACHLOROETHYLENE Y
Y
•5,280.
~840.
•10,200.
•450.
0.8«g**
8.85ug*»

1980FR
1
TETRACHLOROPHENOL

2.3,5.6
Y
N

•440.

1980FR

13.Hg
48.ug

1980FR
2
TOLUENE
Y
N
•17,500.

•6,300.
•5,000.
14.3mg
424.mg

1980FR
1
TOXAPHENE
Y
Y
0.73
0.0002
0.21
0.0002
0.71ng**
0.73ng**
0.005mg
1986FR
17
TRICHLORINATED

ETHANES
Y
Y
•18,000.

1980FR

TRICHLOROETHANE 1.
1.1 Y
N

•31,200.

18.4mg
1.03g

1980FR
1
TR1CHLOROETHANE 1.1.2 Y
Y

•9.400.

O.6«g*0
41.8«g*»

1980FR
1
TRICHLOROETHYLENE
Y
Y
•45.000.
•21,900.
•2,000.

2.7ug**
80.7ug**

1980FR
1
TRICHLOROPHENOL 2.4,5 N
N

2,600.ug

1980FR

TRICHLOROPHENOL 2,4.6 Y
Y

•970.

1.2«g**
3.6«g*»

1980FR

VINYL CHLORIDE
Y
Y

2.ug**
525.ug**

1980FR

ZINC
Y
N
120.+
110.+
95.
86.

1987FR
19
-------
ATTACHMENT A
NOTES
g = grams
mg = milligrams
ug = micrograms
ng = nanograms
f = fibers
Y = YES + = Hardness Dependent Criteria (lOOmg/L used) FR = FEDERAL REGISTER
N = NO RB = QUALITY CRITERIA FOR WATER, 1976 (REDBOOK)
~ = Insufficient Data to Develop Criteria.
Value Presented is the L.O.E.L. - Lowest Observed Effect Level
** = Human Health Criteria For Carciogens Reported For Three
Risk Levels. Value Presented is the 10"6 Risk Level
- pH Dependent Criteria (7.8 pH used)
M.C.L. = MAXIMUM CONTAMINANT LEVEL
-------
ATTACHMENT A
CRITERIA PROPOSED BY EPA FOR DEVELOPMENT IN THE NEAR
FUTURE
Criteria
Acrolein (no saltwater criteria)
AcTylonitrile (no saltwater criteria)
Aluminum (draft criteria dated 2/18/86 rcc'd)
An aline (no saltwater criteria)
Antimony in
Chloroform (no saltwater criteria)
Diethylhexyphthalate
Dimethylphenol
Hexachlorobenzene
Hexachlorobutadiene (no saltwater criteria)
Organotins
Phenanthrene
Phenol (no saltwater criteria)
Silver (no saltwater criteria)
Tetrachloroethylene (no saltwater criteria)
Thallium (no saltwater criteria)
Toluene (no freshwater criteria)
Tributyltin (advisory [9/14/87] rec'd) - criterion expected in FY'90
1.2.4, Trichlorobenzene
2.4.5, Trichlorophenol
1 5
-------
ATTACHMENT A
ADVISORIES/CRITERIA PROPOSED BY EPA FOR DEVELOPMENT
IN THE NEAR FUTURE
Advisories
Bis-2 chloroethyoxymethane
Carbazole
Chlorides (freshwater only)
Chlorinated Styrenes
Cobalt
Diaminotoluene
Dibenzofurans
Dimethylsulfoxide
1,3.-Dinitrobenzene
Dioxins (other than 2,3.7.8-TCPP)
Microbiological
Nitroaniline
Nitrogen
p-dioxane
Phosphates
Polychlorinated diphenyl ethers
Styrene
Tetramethyl lead
Xylene
1 6
-------
ATTACHMENT B
SCHEDULE FOR TRIENNIAL REVIEWS OF WATER QUALITY
STANDARDS
MARYLAND
Triennial review of all water quality standards in 1988.
PENNSYLVANIA
Triennial review of all water quality standards in 1988. Proposed rulemaking presented
to Water Quality Board in January. Public hearings to be scheduled in near future.
VIRGINIA
Triennial review completed in 1987. Initiate process for the next triennial review
during the next fiscal year. Water Control Board has directed staff to initiate process to
incorporate EPA toxics criteria into standards when national guidance received from EPA.
WASHINGTON. D.C.
Plans to review and revise water quality standards by December 1988.
1 7
-------
ATTACHMENT C
WORKSHEETS FOR THE COMPARISON OF WATER QUALITY
CRITERIA AND STANDARDS WITH CHESAPEAKE BAY HABITAT
REQUIREMENTS
The enclosed worksheets were developed to compare Water Quality Criteria and
Standards of EPA and the Bay jurisdictions with the Chesapeake Bay habitat requirements.
The following references were used:
o Habitat Requirements For Chesapeake Bay Living Resources: A report from the
Chesapeake Bay Living Resources Task Force. U.S. EPA, 1987.
o Quality Criteria For Water - 1986. EPA 440/5-86-001.
o Water Quality Standards documents from Virginia, Maryland, Pennsylvania, and
the District of Columbia.
The parameters examined are as follows:
CONVENTION ALS
METALS
BIOCIDES
Temperature
Turbidity
Secchi Depth
Light Intensity
Light Extinction Coeff.
Suspended Solids
Chlorophyll
DIN
DIP
Dissolved Oxygen
pH
Salinity
Alkalinity
Total Hardness
Chlorine
Cadmium
Zinc
Aluminum
Nickel
Manganese
Silver
Mercury
Copper
Lead
Aldrin
Toxaphene
Dieldrin
Endrin
Atrazine
Paraquat/Diquat
Chlordane
Malathion
Dichlorophenoxy Acetic Acid
Trichlorophenoxy Acetic Acid
DDT
TBT
OTHER ORGANIC CHEMICALS
Phenol
Orthodichlorobenzene
Trichlorobenzene
1 8
-------
ATTACHMENT C
NOTES ABOUT JURISDICTIONAL POLICIES
Virginia:
Virginia has both criteria and standards. Unless otherwise footnoted as being State
standards, all values are criteria only. One basic distinction differentiates water quality
criteria from water quality standards. The standards are always mandatory while the
criteria are not Criteria shall be utilized as mandatory requirements when in judgement of
the Board they are necessary to ensure the protection of the beneficial uses of the water
body. The agency will employ the criteria values or any others it deems appropriate in
establishing effluent limitations or other limitations necessary to protect the beneficial uses.
The Board may consider modifications to these criteria, on a case-by-case basis, dependent
upon a site-specific determination performed by the permittee which demonstrates that
alternate criteria are sufficient to ensure protection of water quality.
Maryland:
Maryland has only water quality standards. In cases where there are no established
State standards, MDE has a staff level working policy of using EPA's water quality criteria
in their NPDES permit program in the following manner. In most cases where they find
industries with toxics, they start with EPA's effluent guideline numbers. A mass balance is
calculated and compared to the Criteria to determine if the Criteria number is met When it
isn't, the permit number will be made more stringent. On occasion, the effluent guidelines
might not include a number for a particular chemical in the effluent. They may include it as
a permit parameter based on Criteria numbers or some other basis.
District of Columbia:
The District of Columbia utilizes only standards. For those toxics where the District
has no numerical standard, a guideline value for Class C waters is 10 percent of the 96
hour LC50 for affected biota for short-term exposure. Class C waters are those waters
protected for aquatic life, waterfowl, shorebirds, and water-oriented wildlife.
Pennsylvania:
Pennsylvania has both criteria and standards. Water quality standards are defined as a
combination of water uses to be protected and the criteria necessary to protect those uses.
Water quality criteria are defined as the levels of parameters that must be maintained or
attained to prevent or eliminate pollution. All of Pennsylvania's waters are protected for
fish and aquatic life, human health, and recreational activities; therefore, the most stringent
criteria necessary to protect any of these uses would be applicable. All criteria are thus
included in the "Fresh" row.
1 9
-------
ATTACHMENT C
EPA CRITERIA: TEMPERATURE
Freshwater Aquatic Life
For any time of year, there are two upper limiting temperatures for a location (based on
the important sensitive species found there at that time):
1. One limit consists of a maximum temperature for short exposures that is time dependent
and is given by the species-specific equation:
Temperature (°C) = (1/b) (logio [timemin] -a) - 2° C
where: logio = logarithm to base 10 (common logarithm)
a = intercept on the "y" or logarithmic axis of the line fitted to
experimental data and which is available for some species from
Appendix II-C, National Academy of Sciences 1974 document.
b = slope of the line fitted to experimental data and available for some
species from Appendix II-C, National Academy of Sciences
document.
2. The second value is a limit on the weekly average temperature that:
a. In the cooler months (mid-October to mid-April in the north and December to
February in the south) will protect against mortality of important species if the
elevated plume temperature is suddenly dropped to the ambient temperature, with the
limit being the acclimation temperature minus 2Pt° C when the lower lethal threshold
temperature equals the ambient water temperature (in some regions this limitation
may also be applicable in summer).
or
b. In the warmer months (April through October in the north and March through
November in the south) is determined by adding to the physiological optimum
temperature (usually for growth) a factor calculated as one-third of the difference
between the ultimate upper incipient lethal temperature and the optimum temperature
for the most sensitive important species (and appropriate life state) that normally is
found at that location and time.
or
c. During reproductive seasons (generally April through June and September through
October in the north and March through May and October through November in the
south) the limit is that temperature that meets site-specific requirements for
successful migration, spawning, egg incubation, fry rearing, and other reproductive
functions of important species. These local requirements should supersede all other
requirements when they are applicable.
or
d. There is a site-specific limit that is found necessary to preserve normal diversity or
prevent appearance of nuisance organisms.
Marine Aquatic Life
In order to assure protection of the characteristic indigenous marine community of a
water body segment from adverse thermal effects:
20
-------
ATTACHMENT C
a. The maximum acceptable increase in the weekly average temperature resulting from
artificial sources is 1° C (1.8° F) during all seasons of the year, providing the
summer maxima are not exceeded;
and
b. Daily temperature cycles characteristic of the water body segment should not be
altered in either amplitude or frequency.
Summer thermal maxima, which define the upper thermal limits for the communities of
the discharge area, should be established on a site specific basis. Existing studies suggest
the following regional limits:
Subtropical regions (south of
Cape Canaveral and Tampa
Bay, Florida, and Hawaii)
Cape Hatteras, N.C. to Cape
Canaveral, Fla.
Long Island (south shore) to
Cape Hatteras, N.C.
Short-term
Maximum
32.2° C (90° F)
32.2° c (90° F)
30.6° C (87° F)
Maximum True
Daily Mean*
29.4o C (85° F)
29.40 c (850 p)
27.8° C (82° F)
(* True Daily Mean = average of 24 hourly temperature readings.)
Baseline thermal conditions should be measured at a site where there is no unnatural
thermal addition from any source, which is in reasonable proximity to the thermal discharge
(within 5 miles) and which has similar hydrography to that of the receiving waters at the
discharge.
2 1
-------
ATTACHMENT C
VIRGINIA WATER CONTROL BOARD:
SITE-SPECIFIC TEMPERATURE REQUIREMENTS
A. Criteria for Developing Site-Specific Temperature Standards
For any specified time of year there shall be two upper limiting temperatures for a
location based on temperature requirements of important sensitive species found at the
location at that time. These limiting temperatures are:
1. A maximum weekly average temperature that:
a. In the warmer months is determined by adding to the physiological optimum
temperature (usually the optimum for growth) for the most sensitive important
species (and appropriate life stage) that normally is found at that location and time; a
factor calculated as one-third of the difference between the ultimate upper incipient
lethal temperature and the optimum temperature for that species;
b. In cooler months is an elevated temperature that would still ensure that important
species would survive if the temperature suddenly dropped to the normal ambient
temperature;
c. During those seasons of reproduction meets specific site requirements for successful
migration, spawning, egg incubation, fry rearing, and other reproductive functions
of important species;
d. At a specific site is found necessary to preserve normal species diversity or prevent
undesirable growths of nuisance organisms.
2. A time-dependent maximum temperature for short exposures.
Baseline thermal conditions shall be measured at a site where there is no unnatural
thermal addition from any source, which site is in reasonable proximity to the thermal
discharge (within 5 miles), and which has similar hydrography to that of the receiving
waters at the point of discharge.
Standards development should be in accordance with Water Quality Criteria 1972: A
Report of the Committee on Water Quality Criteria and Quality Criteria for Water. U.S.
EPA.
B. 316 (a) Determinations
A successful demonstration concerning thermal discharge limits carried out under
Section 316(a) of the Clean Water Act shall constitute compliance with the temperature
requirements of these standards. A successful demonstration must assure the protection and
propagation of a balanced indigenous population of aquatic species and wildlife in or on the
water into which the discharge is made. When making a determination concerning thermal
discharge limits under Section 316(a) of the Clean Water Act, the Board shall provide
notice and opportunity for a public hearing.
22
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Temperature
UNITS: Degrees Centigrade
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA* DISTRICT OF COLUMBIA
FRESH # <20n; <21r; <31 (mtn. zone) <20n, <23.9r 2.3 increase above ambient 32.2 max.
<32 (coastal zone); also see marine <32a 1 increase per hr. 2.8 anthropogenic increase
No increase if ambient temp >30.5
MARINE 1 anthropogenic increase, 3 anthropogenic <32 None Same as fresh
No alteration of daily cycle increase,
2 anthropogenic increase/hr.
OTHER tt ft

Habitat

SPKKS
Requirements
Notes
Snowy Egret
3-31
a - All natural waters
Spot
6.3-32.5
f - Eggs
Eelgrass
8-30
g - Larvae
Yellow Perch
10-191
i - Larval/juvenile stage
Menhaden
10-30
j - Mean temp, during spring larval set
White Perch
11-301; 12-20°
k - Mean temp, during fall larval set
Alcwifc
12.7-26.7f; 16-248
n - Natural trout waters
Blucback Herring
12.7-26.7f; 16-248
0 - Optimum
Bay Anchovy
15-30
r - Recreational trout waters
Sago Pondwccd
15-35
t - Tolerate
Redhead Grass
15-35
x - Under Revision
American Shad
15.5-26.6
# - Species/season specific, see attachment
Hickory Shad
15.5-26.6

Striped Bass
16-19'

Wild Celery
18-35"

Hard Clam
18-30

Soft Shell Clam
19.4-21.9J; 19.6-13.9k

Widgeon Grass
20-26

Blue Crab
<33

-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Turbidity
UNITS: NTU
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH <10% Anthropogenic None 50 Avg./Monlh None <20% Anthropogenic
Increase 150 Max Increase
MARINE <10% Anthropogenic None Same as Fresh None Same as Fresh
Increase
OTHER

Habitat
Species
Requirements
Eelgrass
<15
Wild Celery
<20
Sago Pond weed
<20
Redhead Grass
<20
Widgeon Grass
<20
White Perch
<50
Yellow Perch
<50
Alcwife
<50
Blue back Herring
<50
American Shad
<50
Hickory Shad
<50
Spot
<50
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Sccchi Depth
UNITS: Meiers
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH <10% Anthropogenic
decrease
None
None
None
None
MARINE Same as Fresh
None
None
None
None
OTHER
Species
Greal Blue Heron
Black Duck
Wild Celery
Sago Pondwecd
Redhead Grass
Widgeon Grass
Eelgrass
Redhead Duck
Habitat
Requirements
0.5
.25
Notes
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Light Intensity
UNITS: uE/M2/Scc
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH <10% Anthropogenic None None None None
decrease
MARINE <10% Anihropengic None None None None
decrease
OTHER
Habitat
Species Requirements NolCS
Wild Celery 100
Eelgrass 220
Redhead 230
Widgeon grass 236
Sago Pondwecd 350
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Kd (Light Extinction Coefficient)
UNITS: M-L
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH <10% Anthropogenic None None None None
decrease
MARINE Same as fresh None None None None
OTHER
Habitat
Species Requirements Notes
Sago Pondweed
Redhead Grass
Widgeon Grass
1.7-2.0
1.7-2.0
1.7-2.0
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Suspended Solids
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH None None None None None
MARINE None None None None None
OTHER
Habitat
Species Requirements Notes
American Oyster < 35000
Blueback Herring < 50000
American Shad < 50000
Hickory Shad < 50000
Alewife 50000
Spot < 70000
While Perch < 70000
Yellow Perch 5000000 (Reduced Larval Survival)
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Chlorophyll
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH None p None None None
MARINE None p None None None
OTHER
Species
Eelgrass
Sago Pondweed
Wild Celery
Redhead Grass
Widgeon Grass
Habitat
Requirements
<10
<15
<15
<15
<15
Notes
p - Standard for designation of
"Nutrient waters' based on
Chlorophyll levels has been proposed.
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: DIN (Dissolved Inorganic Nitrogen)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICTOFCOLUMBIA
FRESH None None None None None
MARINE None None None None None
OTHER
Habitat
Species Requirements Notes
Wild Celery <700-14000
Sago Pond weed < 140
Redhead Grass < 140
Widgeon Grass < 140
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: DIP (Dissolved Inorganic Phosphorus)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH None None None None None
MARINE None None None None None
OTHER
Habitat
Species Requirements Notes
Wild Celery < 10
SagoPondweed < 10
Redhead Grass < 10
Widgeon Grass < 10
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER:
UNITS:
Dissolved Oxygen
mg/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
MARINE
OTHER
3.0U min.
4.0U weekly avg. min.
5.0e min.
Same as fresh
8.0c,e min.
4.0C,U min.
4.0s min.
5.0s daily avg. min.
Same as fresh
5.0S'X min.
6.0s'* daily avg.
6.0s,n min.
7.0s'11 daily avg.
5.0 min
Same as fresh
4.0 min.
5.0 daily avg. min.
None
4.0 min.
5.0 daily avg. min.
Same as fresh
5.0n min.
6.0" daily avg. min.

Habitat

Species
Reauircments
Notes
Blue Crab
> 2
e - Early life stages
Hard Clam
> 2.4
f - Will be higher if Temp. > 25 C°
American Oyster
> 2.4f
n - Natural trout waters
Soft Shell Clam
> 5
o - Optimum
Snowy Egret
>5<1
s - State standard
Striped Bass
4.5 - 20l
t - Tolerate

6-12°
u - Other than early life stages
While Perch
> 5
q - Protects prey species
Yellow Perch
> 5
c - Cold water species present (e.g. trout)
Alewife
> 5
x - Put and take trout waters
Blucback Herring
> 5

American Shad
> 5

Hickory Shad
> 5

Spot
> 5

Mcnhandcn
> 5

-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: pH
UNITS: Standard Units
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
6.5-9c
6-9s
6.5-8.5
6-9
6.0-8.5
MARINE
6.5-8.5C
0.2 change from Amb.
Same as fresh
Same as fresh None
Same as fresh
OTHER
Habitat
Species
Requirements
Striped Bass
7.5-8.5 (Optimum)
Soft Shell Clam
6.5-8.0
Hard Clam
6.8-8.5
American Oyster
6.8-8.5
Blue Crab
6.0-8.0
Alewife
6.5-8.5
Blueback Herring
6.5-8.5
American Shad
6.5-8.5
Hickory Shad
6.5-8.5
Spot
6.5-8.5
Menhaden
6.5-8.5
Wild Celery
6.0-9.0
Sago Pondwecd
6.0-9.0
Redhead Grass
6.0-9.0
Widgeon Grass
6.0-9.0
Eelgrass
6.0-9.0
Noics
c - Chronic
s - State Standard
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Salinity
UNITS: mg/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH None None None None None
MARINE 1-4% Anthropogenic None None None None
variation
Habitat
Species Requirements Notes
Striped Bass 0-5 e - Eggs at 12 - 17°C
Wild Celery 0-5 g - Larvae
While Perch 0-1.5l o - Optimum
0-8° q - Salinity tolerance of prey species
Yellow Perch 0.51 l - Can tolerate
16-19°
Alewife 0-5
Blueback Herring 0-5
American Shad 7.5-15e
0-58
Hickory Shad 7.5-15e
0-58
Spot 0-5°
0-321
Bay Anchovy 0-7
Sago Pond weed 0-12
Menhaden 0-15°
0-34.01
Snowy Egret 1-341
Redhead Grass 2-19
Blue Crab 2-21
American Oyster 5-35
Eelgrass 5-35
Widgeon Grass 5-60
Soft Shell Clam >10.5
Hard Clam >17.5
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Alkalinity
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH 20000 min. None None 20000 min. None
MARINE None None None None None
OTHER
Habitat
Species Pftwircmenis Notes
Soft Shell Clam
Hard Clam
Striped Bass
>20000
>20000
>20000
-------
ATTACHMENT C
PARAMETER: Total Hardness
UNITS: ug/1
EPA (criteria)
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
None
None
None
None
None
MARINE
None
None
None
None
None
OTHER
Species
Striped Bass
Habitat
Requirements
200000-250000
Notes
-------
ATTACHMENTC WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Total Residual Chlorine (TRC)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
11.0°
ll-O^
2.0°
None 10.0

19.03
19.0e,s

MARINE
7.5C
1.5s
None
None Same as fresh

13.03
13.08

OTHER

z
q

Habitat

Species

Requirements

Notes
Soft Shell Clam

50.0>

a - Acute
White Perch

150.0i

c - Chronic
Striped Bass

iso.o^o.o*

d - Average Daily
Blueback Herring

200.0

e - One Hour Average

f - Average Daily Chlorine Produced Oxidants

g - One Hour Average Chlorine Produced Oxidants

i - LCO

j-LC5

k - Sublethal

n - Trout waters only, no standard for others

q - Dechlorination required for all users except power

plants. No chlorine can be used by dischargers to

natural trout waters.
s - State Standard
z - Chlorine may not be used by dischargers of >.02
mgd if such discharge is to natural trout waters or
waters containing endangered species.
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Cadmium (Total Recoverable)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
l.lch
3.9a-h
i.oc.h
None
l.OC-b l.oh
393,h
MARINE
43.03
9.3C
9.3C
None
None Same as Fresh
OTHER
10.0W
10.0d
10.0P

lO.Op
Species

Habitat
Requirements

Notes
Striped Bass
Soft Shell Clam

l.O6
150.01

a - Acute
c - Chronic
d - Drinking water M.C.L. (Maximum Contaminant
Level)
e-LCO
h - Hardness dependent, 100mg/l used
1 - 168hr, LC50
p - Public water supply standard
w - Fish and water ingestion waters
-------
ATTACHMENTc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Zinc (Total Recoverable)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH 110.0c.h 47.0C None 36.0c.h^ 50.0
120.0a.h
MARINE 86.0C 5%.(F None None Same as Fresh
95.0a
OTHER 5000P 5000P
Snecics
Hard Clam
Striped Bass
Soft Shell Clam
Habitat
Requirements
es.o*1
lOO.O6
100.0f
Notes
a - Acute
b - Total recoverable
c - Chronic
d - Zinc chloride LC5
e - Zinc chloride LCO
f - 168hr. LC50
p - Standard for public water supply
h - Hardness dependent (100 mgfl used)
r - Under revision
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Aluminum (Total)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICTOFCOLUMBIA
FRESH
None
None
None
500° »h
MARINE
None
None
None
None
OTHER
Habitat
Spa'CS Requirements
Striped Bass Dissolved Aluminum is "Of Concern"
Notes
c - Chronic
h - Hardness, pH dependent
z - Guideline is 10% of the 96hr. LC50 for effected
biota for short term exposure.
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Nickcl (Total Recoverable)
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
160.0°
MOO-O^

None
109,0^
100.0
MARINE
8.3C
75.03
7.1C
None
None
OTHER
13.0W
100.0f
13.0P
Species
White Perch
Hard Clam
Striped Bass
Soft Shell Clam
Habitat
Requirements
lllO.O41
6200.0*
50000.0b
Notes
a - Acute
b - 168hr. LC50
c - Chronic
d - Nickel chloride, LC5
f - Fish ingestion waters
h - Hardness dependent, 100 mg/1 used
w - Water and fish ingestion waters
p - Standard for public water supply
r - Under revision
x - 96hr. LC50, Appendix A, "Habitat Rcq. ..."
-------
ATTACHMENTC
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Managanese
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH None None None lOOO*5
MARINE None 100 None None
(Total)
£ OTHER 50.0W 50.0P
100f (Soluble)
Species
Soft Shell Clam
f - Fish ingestion waters
I - 168hr. LC50
p - Public water supply standard
w - Water and fish ingestion waters
z - Guideline is 10% of the 96HR. LC50 for effected biota
for short term exposure.
Habitat
Requirements NotSS
3000* e" Aesthetics
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Silver (Total Recoverable)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
4 la.h
0.12c-h
0.04 lc.h
None 4.1a-^ 1.0(dissolvcd)
0.12C
MARINE
2.3a
0.023c
None None Same as fresh
OTHER
50.0W
SO.Od
50.0P

Species

Habitat
Requirements
Notes
White Perch
Hard Clam

17.0b
21.0b
a - Acute
b - Silver Nitrate, LC5
c - Chronic
d - Drinking water M.C.L. (maximum contaminant level)
h • Hardncs dependent, 100 mg/1 used
p - Public water supply standard
w - water and fish ingestion waters
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Mercury (Total Recoverable)
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
2.4a
0.12c»h
0.05s
None
0.012c
0.12C
0.012
MARINE
2.1a
0.1C (total)
None
None
Same as fresh
OTHER
0.144w
0.146f
2.0d
0.144*
O.lP
Snccics
White Perch
Habitat
Requirements
4.0
Notes
a - Acute
c - Chronic
d - Drinking water M.C.L.
f - Fish ingestion waters
p - Public water supply
m - Methyl mercury
1 - Mercuric chloride LC5
s - State standard
x - Human health
w - Water and fish ingestion waters
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Copper (Total Recoverable)
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH

11.0^
None
13.0CJ.h
0.12C
ll.Ob
MARINE
OTHER
2.9a
2.9C
1000P
None
None
Same as fresh
1.0P
Species
Striped Bass
White Perch
Soft Shell Clam
Habitat
Requirements
100.01
100.0m
23.0"
35.0°
Notes
a - Acute
c - Chronic
h - Hardness dependent (100 mg/1 used)
1 - Copper sulfate, LC0
m - Cupric chloride, LC0
n - Cupric chloride, LC5
o - 168hr„ LC50
p - Public water supply standard
r - Under revision
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Lead (Total Recoverable)
UNITS: ug/l
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
82.0a-h
32c,h
32c,h
None 39.0c,r''1
3.2h
MARINE
140.03
5.6C
5.6C
None None
Same as fresh
OTHER
50.0W
S.O11
50.0P

1.0P
Species

Habitat
Requirements
Notes

Soft Shell Clam

88001
a - Acute
b - Total recoverable
c - Chronic
d - Drinking water M.C.L. (maximum contaminant level)
h - Hardness dependent (100 mg/1 used)
1 - 168hr. LC50
p - Public water supply standards
w - Fish and water ingestion waters
r - Under revision
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Aldrin
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
3.03
0.03c
0.003
0.000074*
0.0004
MARINE
1.3a
0.003c
Same as fresh
None
Same as fresh
OTHER
0.000074w
0.000079^
0.00007P
Species
Striped Bass (juvenile)
Striped Bass (larvae)
Hard Clam
Habitat
Requirements
7.2*
10.0*
41.01
Notes
a - Acute
c - Chronic
f - Fish ingestion waters
1-LC0
w - Water and fish ingestion waters
p - Public water supply
x - 96hr. LC50, Appendix A, "Habitat Reg...."
* - Carcinogen @ 10"6 risk level
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Toxaphcnc
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
MARINE
OTHER
0.73a
0.0002c
0.21a
0.0002°
0.0007 lw>*
0.00073f>*
5<*
0.013C
0.0007c
5P
0.005
Same as fresh
0.00071
None
0.01
Same as fresh
0.0007P-*
Species
Striped Bass (juvenile)
Hard Clam
Habitat
Requirements
4.4*
25b
Notes
a - Acute
b - LC50
c - Chronic
d - Drinking water M.C.L. (maximum contaminant levels)
f - Fish ingestion waters
p - Public water supply standard
w - Water and fish ingestion waters
~ - Carcinogen @ 10"6 risk level
x - 96hr. LC50, Appendix A, "Habitat Rcq. ..."
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Dicldrin
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
2.5a
0.0019°
0.0019°
0.003
0.000071
0.0019
MARINE
OTHER
0.7 la
0.00190
0.0007 lw'*
0.00076f*
Same as fresh
Same as fresh
None
Same as fresh
0.0007P-*
Habitat
Species Requirements
Striped Bass (larvae) 1.0*
White Perch 100001
. Notes
a - Acute
c - Chronic
f - Fish ingestion waters
1 - LC50
p - Public water supply
x - 96hr. LC50, Appendix A, "Habitat Req...."
w - Water and fish ingestion waters
* - Carcinogen @ 10"^ risk level
-------
attachmentC WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Endrin
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
o.l 8a
0.0023c
0.0023c
0.004
0.18a 0.0023
MARINE
0.0373
0.0023c
Same as fresh
Same as fresh
None Same as fresh
OTHER
1.0W
0.2d
0.2P

1.0P
Species

Habitat
Requirements

Notes
Striped Bass (Juvenile)
Litde Blue Heron
Great Egret
Great Heron
Great Blue Heron
Snowy Egret
.094*
50-10000^
50-10000b
50-10000b
50-10000b
50-10000b

a - Acute
b - Toxic to Prey Species
c - Chronic
d - Drinking water M.C.L. (maximum contaminant level)
p - Public water supply standard
w - Water and fish ingestion waters
x - 96hr. LC50, Appendix A, "Habitat Req...."
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Atrazine
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
MARINE
None
None
None
None
None
None
560C.e
None
OTHER
SpgcigS
Wild Celery
Redhead Grass
Eelgrass
Habitat
Requirements
12d
50b
100-1000
Notes
b - Levels above this reduce photosynthesis
c - Chronic
d - Mortality above this level
e - Human health
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure
-------
ATTACHMENT C
PARAMETER: ParaquaiyDiquat
UNITS: ug/1
EPA (criicria)
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
None
None
None

MARINE
None
None
None
None
OTHER
Species
Sago Pond weed
Striped Bass
Habitat
Requirements
<250
1000*
Notes
c - Chronic
e - Human health criteria
x - 96hr. LC50, Appendix A, "Habitat Req. ..."
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Chlordane
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
2.4a
0.0043C
0.0043C
None
0.00046
0.0043
MARINE
0.093
0.004c
0.004c
None
None
0.0005
OTHER
0.00046w>*
0.00048f
SPTC'CS
Striped Bass
Habitat
Requirements
<2.4
Notes
a - Acute
c - Chronic
f - Fish ingestion waters
w - Water and fish ingestion waters
* - Carcinogen @ 10'^ risk level
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Malalliion
UNITS: ug/I
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH 0.1C 0.1C None 0.23c>e
MARINE 0.1c 0.1C None None z
OTHER
Habiiat
Species Requirements NWS
Striped Bass <14 a-Acute
c - Chronic
e - Human health
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: 2,4-D Dichlorophcnoxyacetic Acid
UNITS: ug/l
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
None
None
None
Not Dcteciiblc+
MARINE
None
None
None
None
OTHER
100w
O.lP
Species
White Perch
Habitat
Requirements
55500'
Notes
I - LC50
p - Public water supply standard
w - Water and fish ingestion waters
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure.
+ - Mutagen
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: 2,4,5 T (2,4,5 Trichlorophenoxyacetic Acid)
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESII None None None None z
MARINE None None None None z
OTHER
Habiuit
Species Requirements Notes
Striped Bass <10 z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure.
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: DDT
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
MARINE
l.la
0.00 lc
0.13a
0.00 lc
0.001c
Same as fresh
0.001
Same as fresh
0.000024
None
0.001
Same as fresh
OTHER 0.000024w.f>*
Species
Striped Bass (juvenile)
While Perch
Habitat
Requirements
0.53*
80001
Notes
a - Acute
c - Chronic
f - Fish ingestion waters
1 - LC50
p - Public water supply
w - Water and fish ingestion waters
x - 96hr. LC50, Appendix A, "Habitat Req...."
* - Carcinogen @ 10~6 risk level
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: TBT
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH Noned * *
MARINE Noned ~ • None z
OTHER
Habitat
Species Requirements Notes
Striped Bass "Of Concern" d - Advisory issued, .01 ug/1
c - Chronic
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure
• - Use restricted, standard under development
-------
ATTACHMENT C
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Phenol
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH
2560.0°
-------
ATTACHMENTC
WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Orthodichlorobcnzene (1,2 - Dichlorobenzene)
UNITS: ug/1
EPA (criteria)
VIRGINIA
STANDARD/CRITERIA
MARYLAND PENNSYLVANIA
DISTRICT OF COLUMBIA
FRESH
MARINE
None
None
None
None
None
None
763c
11203
None
OTHER
Species
Hard Clam
Habitat
Requirements
100001
Notes
a - Acute
c - Chronic
1-LCO
z - Guideline is 10% of the 96hr. LC50 for effected biota for
short term exposure.
-------
attachmentc WATER QUALITY STANDARDS/CRITERIA
COMPARISON WITH HABITAT REQUIREMENTS
PARAMETER: Trichlorobcnzcne
UNITS: ug/1
STANDARD/CRITERIA
EPA (criteria) VIRGINIA MARYLAND PENNSYLVANIA DISTRICT OF COLUMBIA
FRESH 50c,p None None 250^ z
250a,P
MARINE 129C-P None None None z
KW
OTHER
Species
Hard Clam
Habitat
Requirements
10001
Notes
a - Acute
c - Chronic
d - Draft criteria document to be proposed
I-LCO
p - Insufficient data available to determine criteria; value is
lowest observable effect level (L.O.E.L.). This L.O.E.L. is
for chlorinated benzenes. Criteria specific to 1,2,4 - tri-
chlorinated benzene is to be proposed,
y - (1,2,4 -Trichlorobcnzcne)
z - Guideline is 10% of ihc 96hr. LC50 for effected biota for
short term exposure.
-------