Segment

Two-Month Median (mg/m²)

Seasonal Median (mg/m²)

Shenandoah River from its confluence of the North Fork and South Fork Shenandoah Rivers downstream to the Virginia-West Virginia state line

150

100

North Fork Shenandoah River from its confluence with Fort Run downstream to its confluence with the South Fork Shenandoah River

150

100

South Fork Shenandoah River from its confluence with the North and South Rivers downstream to its confluence with the North Fork Shenandoah River

150

100

Media Type

Fish Tissue¹

Water Column⁴

Criterion Element

Egg-ovary²

Fish Whole-body or Muscle³

Monthly Average Exposure

Intermittent Exposure⁵

Magnitude

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

WQC_int = WQC_30-day - C_bkgrnd(1- f _int)

f_int

Duration

Instantaneous measurement⁶

Instantaneous measurement⁶

30 days

Number of days/month with an elevated concentration

Frequency

Not to be exceeded

Not to be
exceeded

Not more than once in three years on average

Not more than once in three years on average

mg/kg dw = milligrams per kilogram dry weight

1. Fish tissue elements are expressed as steady state.

2. Egg-ovary supersedes any whole-body, muscle, or water column element when fish egg-ovary concentrations are measured [ , except as noted in footnote 4 ].

3. Fish whole-body or muscle tissue supersedes water column element when both fish tissue and water concentrations are measured [ , except as noted in footnote 4 ].

4. Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. [ Water When selenium inputs are increasing, water ] column values are the applicable criterion element in the absence of steady-state condition fish tissue data. In fishless waters, [ selenium concentrations in fish from the nearest downstream waters may be used to assess ] compliance [ may be assessed ] using methods [ provided in consistent with ] Aquatic Life Ambient Water Quality Criterion for Selenium – Freshwater, [ EPA-822-R-16-006, Appendix K: Translation of a Selenium Fish Tissue Criterion Element to a Site-Specific Water Column Value (June 2016) EPA-822-R-21-006 ].

5. Where WQC_30-day is the water column monthly element for either lentic (still) or lotic (flowing) waters; C_bkgrnd is the average background selenium concentration; and f_int is the fraction of any 30-day period during which elevated selenium concentrations occur, with f_int assigned a value [ ≥ greater than or equal to ] 0.033 (corresponding to one day).

6. Fish tissue data provide instantaneous point measurements that reflect integrative accumulation of selenium over time and space in fish populations at a given site.

SEC.

CLASS

SP. STDS.

SECTION DESCRIPTION

1

IV

All tributaries of Tug Fork in Virginia.

2

IV

All tributaries of Jacobs Fork and Dry Fork in Virginia.

2a

IV

PWS

Crockett Cove, a tributary to Jacobs Fork, from Bishop's raw water intake to its headwaters.

3

IV

jj

Levisa Fork and its tributaries and Knox Creek and its tributaries, unless otherwise designated in this chapter, from the Virginia-Kentucky state line upstream to their headwaters.

V

Stockable Trout Waters in Section 3

vi

Dismal Creek from its mouth to its headwaters.

4

IV

Russell Fork and its tributaries, unless otherwise designated in this chapter, from the Virginia-Kentucky state line upstream to their headwaters.

V

Stockable Trout Waters in Section 4

***

Caney Creek from Long Branch Creek upstream 5.5 miles.

vi

Frying Pan Creek from 1.3 miles above its confluence with Russell Fork 8.6 miles upstream (in vicinity of Bucu).

vi

North Fork Pound River from the town limits of Pound upstream to the water supply dam.

***

Russell Fork from the confluence of Pound River to the Virginia-Kentucky state line.

VI

Natural Trout Waters in Section 4

iii

Pound River from its confluence with Russell Fork upstream to the John W. Flannagan Dam.

4a

IV

PWS

Pound River and its tributaries from the John W. Flannagan Dam, including the Cranes Nest River and its tributaries to points 5 five miles above the John W. Flannagan Water Authority's raw water intake.

4b

IV

PWS

North Fork Pound River and its tributaries from North Fork Pound River Dam and the Town of Pound's raw water intake upstream to their headwaters, unless otherwise designated in this chapter.

4c

(Deleted)

4d

IV

Phillips Creek from its mouth to its headwaters and the North Fork Pound River from Wise County's swimming area around the mouth of Phillips Creek to a point 1/2 mile upstream.

4e

IV

PWS

Russell Fork River and its tributaries from the Kentucky state line 2.2 miles upstream (Elkhorn City, Kentucky raw water intake including Grassy Creek from its confluence with Russell Fork northeast to the Kentucky state line, Hunts Creek from its confluence with Grassy Creek to 1 one mile upstream, Laurel Branch to its headwaters, including Laurel Lake (Breaks Interstate Park raw water intake).

V

Stockable Trout Waters in Section 4e

***

PWS

Russell Fork from the Kentucky state line 2.2 miles upstream.