WSP05781

• File Number: 8200.750
• Description: San Juan River General
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 4/1/1994
• Author: Robin Abell
• Title: San Juan River Basin - Water Quality and Contaminants Review - Volume I - April 1994
• Water Supply Pro - Doc Type: Report/Study

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table 3:

, ,',.\
EPA' water quality crit~ha for selected trace elements, freshwater

Acute Chronic
(CMC)" (CCC)"

Element

Arsenic
Cadmium
Chromium (III)
Chromium (IV)
Copper
Lead
Mercury
Nickel
Selenium
Silver
Zinc

360 a
3.9 a,b
1700 a,b
16 a
18 a,b
82 a,b
2.4 a
1400 a,b
20
4.1 a,b
120 a,b

190 a
1.1 a,b
210 a,b
11 a
12 a,b
3.2 a,b
0,012 c
160 a,b
5

110 a,b

* CMC _ criteria maximum concentration - the water quality criteria to protect against acute
effects in aquatic life and is the highest instream concentration of a priority toxic
pollutant consisting of a one-hour average not to be exceeded more than once every
three years on the average
cee _ criteria continuous concentration - the water quality criteria to protect against chronic
effects in aquatic life and is the highest instream concentration of a priority toxic
pollutant consisting of a 4-day average not to be exceeded more than once every
three years on the average

a Criteria for these metals are expressed as a function of the water effect ratio, WER, as
defined in 40 CFR 131.36(0)
b Freshwater aquatic life criteria for these metals are expressed as a function of total
hardness (mg/L), and as a function of the pollutant's WER. Values displayed in the
above table correspond to a total hardness of 100 mgfL and a WER of 1.0.
c If the CCC for total mercury exceeds 0.012 pg/L more than once in a 3.year period
in the ambient water, the edible pportion of the aquatic species of concern must be
analyzed to determine whether the concentration of methyl mercury exceeds the
FDA action level (1.0 mgtkg).

Modified from Office of the Federal Register 1993

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