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Current as of January 02, 2025 | Updated by Findlaw Staff
EPA recommends that metals criteria be expressed as dissolved concentrations (see appendix A, I.A.4 for more information regarding metals criteria).
(a)
|
Chemical |
CCC (μg/L) |
Conversion factor (CF) |
|---|---|---|
|
Arsenic (III) |
1.000 |
|
|
Chromium (VI) |
0.962 |
|
|
Cyanide |
c5.2 |
n/a |
|
Dieldrin |
d0.056 |
n/a |
|
Endrin |
d0.036 |
n/a |
|
Mercury (II) |
0.85 |
|
|
Parathion |
d0.013 |
n/a |
|
Selenium |
0.922 |
|
|
Notes: |
||
|
The term “n/a” means not applicable. |
||
|
CCC is Criterion Continuous Concentration. |
||
|
CCCtr is the CCC expressed as total recoverable. |
||
|
CCCd is the CCC expressed as a dissolved concentration. |
||
|
CCCt is the CCC expressed as a total concentration. |
a CCC=CCCtr.
b CCCd=(CCCtr) CF. The CCCd shall be rounded to two significant digits.
c CCC should be considered free cyanide as CN.
d CCC=CCCt.
(b)
|
Chemical |
mc |
bc |
Conversion factor (CF) |
|---|---|---|---|
|
0.7852 |
−2.715 |
0.850 |
|
|
0.819 |
+0.6848 |
0.860 |
|
|
0.8545 |
−1.702 |
0.960 |
|
|
0.846 |
+0.0584 |
0.997 |
|
|
Pentachlorophenolc |
1.005 |
−5.134 |
n/a |
|
0.8473 |
+0.884 |
0.986 |
|
|
Notes: |
|||
|
The term “exp” represents the base e exponential function. |
|||
|
The term “n/a” means not applicable. |
|||
|
CCC is Criterion Continuous Concentration. |
|||
|
CCCtr is the CCC expressed as total recoverable. |
|||
|
CCCd is the CCC expressed as a dissolved concentration. |
|||
|
CCCt is the CCC expressed as a total concentration. |
a CCCtr=exp {mc[ln (hardness)]+bc}.
b CCCd=(CCCtr) (CF). The CCCd shall be rounded to two significant digits.
c CMCt=exp {mA[pH]+bA}. The CMCt shall be rounded to two significant digits.
Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 132, Tbl. 2 Table 2—Chronic Water Quality Criteria for Protection of Aquatic Life in Ambient Water - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-pt-40-132-tbl-2/
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