Environmental Analysis Tools - Environmental Impact Analysis: Process and Methods - page 275

TABLE 7.2
Example Contaminant Screening for Ecological Risk

Benchmark
Quotient
for Mean
Concentration b

Benchmark
Quotient
for Max
Concentration b

Chronic
Criteria a
μg/l

Mean Site
Concentration
μg/l

Maximum Site
Concentration
μg/l

No
Elevated
Risk

Signiicant
Elevated
Risk

More
Investigation
Necessary Pollutant

Cadmium 0.3 0.3 0.8 1.2 3.0 X

Chromium (VI) 11.0 3 6 0.3 0.5 X

Heptachlor 0.0038 <0.003 <0.003 <1.0 <1.0 X

Lead 2.5 6 21.6 2.4 8.6 X

Nickel 52.0 240 875 4.6 16.8 X

Zinc 120.0 238 789 2.0 6.6 X

4, 4 DDT 0.001 0.0001 0.0003 0.1 0.3 X

Toxaphene 0.0002 <0.0002 <0.0002 <1.0 <1.0 X

Tributyltin 0.072 0.001 0.004 0.0 0.1

Iron 1000 5200 12890 5.2 12.9 X

Dieldrin 0.056 <0.002 <0.003 <0.1 <0.1 X

U.S. EPA 2013.

a

b

See text for description.