Table 1—Acute Water Quality Criteria for Protection of Aquatic Life in Ambient Water
EPA recommends that metals criteria be expressed as dissolved concentrations (see appendix A, I.A.4 for more information regarding metals criteria).
(a)
| Chemical | CMC (µg/L) |
Conversion factor (CF) |
|---|---|---|
| Arsenic (III) | a b339.8 | 1.000 |
| Chromium (VI) | a b16.02 | 0.982 |
| Cyanide | c22 | n/a |
| Dieldrin | d0.24 | n/a |
| Endrin | d0.086 | n/a |
| Lindane | d0.95 | n/a |
| Mercury (II) | a b1.694 | 0.85 |
| Parathion | d0.065 | n/a |
aCMC = CMCtr.
bCMCd = (CMCtr) CF. The CMCd shall be rounded to two significant digits.
cCMC should be considered free cyanide as CN.
dCMC = CMCt.
Notes:
The term “n/a” means not applicable.
CMC is Criterion Maximum Concentration.
CMCtr is the CMC expressed as total recoverable.
CMCd is the CMC expressed as a dissolved concentration.
CMCt is the CMC expressed as a total concentration.
(b)
| Chemical | mA | bA | Conversion factor (CF) |
|---|---|---|---|
| Cadmiuma b | 1.128 | −3.6867 | 0.85 |
| Chromium (III)a b | 0.819 | + 3.7256 | 0.316 |
| Coppera b | 0.9422 | −1.700 | 0.960 |
| Nickela b | 0.846 | + 2.255 | 0.998 |
| Pentachlorophenolc | 1.005 | −4.869 | n/a |
| Zinca b | 0.8473 | + 0.884 | 0.978 |
aCMCtr = exp {mA [ln (hardness)] + bA}.
bCMCd = (CMCtr) CF. The CMCd shall be rounded to two significant digits.
cCMCt = exp mA {[pH] + bA}. The CMCt shall be rounded to two significant digits.
Notes:
The term “exp” represents the base e exponential function.
The term “n/a” means not applicable.
CMC is Criterion Maximum Concentration.
CMCtr is the CMC expressed as total recoverable.
CMCd is the CMC expressed as a dissolved concentration.
CMCt is the CMC expressed as a total concentration.
[60 FR 15387, Mar. 23, 1995, as amended at 65 FR 35286, June 2, 2000]
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