Table 3.3
(continued)
Parameter
a
Table value standards
b, c
Selenium
g
Acute
¼ 18.4
Chronic
¼ 4.6
Silver
Acute
¼ ½e
(1.72[ln(hardness)]
À 6.52)
Chronic
¼ e
(1.72[ln(hardness)]-9.06)
Chronic(trout)
¼ e
(1.72[ln(hardness)]-10.51)
Uranium
Acute
¼ e
(1.1021[ln(hardness)] + 2.7088)
Chronic
¼ e
(1.1021[ln(hardness)] + 2.2382)
Zinc
Acute
¼ 0.978 e
(0.8525[ln(hardness)] + 1.0617)
Chronic
¼ 0.986 e
(0.8525[ln(hardness)] + 0.9109)
a
Metals are stated as dissolved unless otherwise specified
b
Hardness values to be used in equations are in mg/l as calcium carbonate and shall be no greater than 400 mg/L. The hardness values used in calculating the
appropriate metal standard should be based on the lower 95% confidence limit of the mean hardness value at the periodic low
flow criteria as determined from a
regression analysis of site-specific data. Where insufficient site-specific data exists to define the mean hardness value at the periodic low
flow criteria,
representative regional data shall be used to perform the regression analysis. Where a regression analysis is not appropriate, a site-specific method should be
used. In calculating a hardness value, regression analyses should not be extrapolated past the point that data exist
c
Both acute and chronic numbers adopted as stream standards are levels not to be exceeded more than once every three years on an average
d
FT
¼ 100.03(20–TCAP)
Where TCAP is T 30
FT
¼ 100.03(20-T)
Where 0 is T TCAP
TCAP
¼ 20
C cold water aquatic life species present
TCAP
¼ 25
C cold water aquatic life species absent
FPH
¼ 1; Where 8 < pH 9 6
FPH
¼ 1 + 10(7.4-pH)
1.3 Where 6.5 pH 8
FPH means the acute pH adjustment factor, defined by the above formulas
FT means the acute temperature adjustment factor, defined by the above formulas
T means temperature measured in degrees
TCAP means temperature CAP; the maximum temperature which affects the toxicity of ammonia to salmonid and non-salmonid
fish groups
NOTE: If the calculated acute value is less than the calculated chronic value, then the calculated chronic value shall be used as the acute standard
70
H. A. Aziz et al.
(continued)
Parameter
a
Table value standards
b, c
Selenium
g
Acute
¼ 18.4
Chronic
¼ 4.6
Silver
Acute
¼ ½e
(1.72[ln(hardness)]
À 6.52)
Chronic
¼ e
(1.72[ln(hardness)]-9.06)
Chronic(trout)
¼ e
(1.72[ln(hardness)]-10.51)
Uranium
Acute
¼ e
(1.1021[ln(hardness)] + 2.7088)
Chronic
¼ e
(1.1021[ln(hardness)] + 2.2382)
Zinc
Acute
¼ 0.978 e
(0.8525[ln(hardness)] + 1.0617)
Chronic
¼ 0.986 e
(0.8525[ln(hardness)] + 0.9109)
a
Metals are stated as dissolved unless otherwise specified
b
Hardness values to be used in equations are in mg/l as calcium carbonate and shall be no greater than 400 mg/L. The hardness values used in calculating the
appropriate metal standard should be based on the lower 95% confidence limit of the mean hardness value at the periodic low
flow criteria as determined from a
regression analysis of site-specific data. Where insufficient site-specific data exists to define the mean hardness value at the periodic low
flow criteria,
representative regional data shall be used to perform the regression analysis. Where a regression analysis is not appropriate, a site-specific method should be
used. In calculating a hardness value, regression analyses should not be extrapolated past the point that data exist
c
Both acute and chronic numbers adopted as stream standards are levels not to be exceeded more than once every three years on an average
d
FT
¼ 100.03(20–TCAP)
Where TCAP is T 30
FT
¼ 100.03(20-T)
Where 0 is T TCAP
TCAP
¼ 20
C cold water aquatic life species present
TCAP
¼ 25
C cold water aquatic life species absent
FPH
¼ 1; Where 8 < pH 9 6
FPH
¼ 1 + 10(7.4-pH)
1.3 Where 6.5 pH 8
FPH means the acute pH adjustment factor, defined by the above formulas
FT means the acute temperature adjustment factor, defined by the above formulas
T means temperature measured in degrees
TCAP means temperature CAP; the maximum temperature which affects the toxicity of ammonia to salmonid and non-salmonid
fish groups
NOTE: If the calculated acute value is less than the calculated chronic value, then the calculated chronic value shall be used as the acute standard
70
H. A. Aziz et al.