Compliance with the freshwater aquatic life criteria for selenium shall be determined using egg-ovary fish tissue measurements, if available and applicable, or, in the alternative using, whole-body or muscle fish tissue measurements, if available, and if neither are available then using the water column values shown in Table 1703-11, below, for the freshwater aquatic life protection criteria:

Table 1703-11: Freshwater Selenium Ambient Chronic Water

Quality Criteria for Protection of Aquatic Life

Media

Fish Tissue

Water Column

Measurement

Egg/Ovary

Fish Whole Body

or

Muscle

Monthly Average Exposure

Intermittent Exposure

Criteria

15.1 mg/kg dw

8.5 mg/kg dw whole body

or

11.3 mg/kg dw muscle (skinless,

boneless filet)

1.5 µg/L in lentic aquatic systems

3.1 µg/L in lotic aquatic systems

Criteria_{int exp} = [Criteria_{monthly average} – C_bkgrnd(1-f_int)] / f_int

Source. #14203, eff 2-26-25