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9 VAC 25-260 - Virginia Water Quality Standards January 2011 Copper Creek from 2 miles above its confluence with the Clinch River (river mile 211.6). Endangered Species: Fine-rayed pigtoe pearly mussel Shiny pigtoe pearly mussel Fusconaia cuneolus Fusconaia edgariana Copper Creek from Dickensville (river mile 56) in Russell County downstream to its confluence with the Clinch River. Threatened Species: Yellowfin madtom HOLSTON RIVER SUBBASIN Noturus flavipinnis North Fork Holston River from river mile 93.3 (near Broadford) downstream to the Smyth/Washington County line (river mile 82.1). Endangered Species: Shiny pigtoe pearly mussel Fusconaia edgariana North Fork Holston River from the Smyth/Washington County line (river mile 82.1) to the Tennessee/Virginia boundary (river mile 5). Threatened Species: Spotfin chub Hybopsis monacha Middle Fork Holston River from river mile 43 (in Marion) downstream to river mile 18.4. Endangered Species: Tan riffle shell mussel Dysnomia walkeri Middle Fork Holston River from river mile 6.5 to river mile 3.2 near Osceola. Threatened Species: Spotfin chub 9VAC25-260-120 to 9VAC25-260-130. [Repealed] 9VAC25-260-140. Criteria for surface water. Hybopsis monacha A. Instream water quality conditions shall not be acutely 1 or chronically 2 toxic except as allowed in 9VAC25-260-20 B (mixing zones). The following are definitions of acute and chronic toxicity conditions: "Acute toxicity" means an adverse effect that usually occurs shortly after exposure to a pollutant. Lethality to an organism is the usual measure of acute toxicity. Where death is not easily detected, immobilization is considered equivalent to death. "Chronic toxicity" means an adverse effect that is irreversible or progressive or occurs because the rate of injury is greater than the rate of repair during prolonged exposure to a pollutant. This includes low level, long-term effects such as reduction in growth or reproduction. B. The following table is a list of numerical water quality criteria for specific parameters. 14
9 VAC 25-260 - Virginia Water Quality Standards January 2011 Table of Parameters 6, 7 PARAMETER CAS Number Acenapthene (µg/l) 83329 Acrolein (µg/l) 107028 Acrylonitrile (µg/l) 107131 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Aldrin (µg/l) 309002 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Ammonia (µg/l) 766-41-7 Chronic criterion is a 30-day average concentration not to be exceeded more than once every three (3) years on the average.(see 9VAC25-260-155) Anthracene (µg/l) 120127 Antimony (µg/l) 7440360 Arsenic (µg/l) 5 7440382 Bacteria (see 9VAC25-260-160 and 170) Barium (µg/l) 7440393 AQUATIC LIFE USE DESIGNATION FRESHWATER SALTWATER Public Water Acute 1 Chronic 2 Acute 1 Chronic 2 Supply 3 HUMAN HEALTH All Other Surface Waters 4 670 990 6.1 9.3 0.51 2.5 3.0 1.3 0.00049 0.00050 340 150 69 36 10 8,300 40,000 5.6 640 2,000 15
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