Virginia Water Quality Standards - Water - US Environmental ...

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9 VAC 25-260 - Virginia Water Quality Standards January 2011 USE DESIGNATION PARAMETER CAS Number Silver (µg/l) 5 7440224 Freshwater values are a function of total hardness as calcium carbonate (CaCO 3 ) mg/l and the WER. The minimum hardness allowed for use in the equation below shall be 25 and the maximum hardness shall be 400 even when the actual ambient hardness is less than 25 or greater than 400. Freshwater acute criterion (µg/l) WER [e {1.72[In(hardness)]-6.52} ] (CF a ) WER = Water Effect Ratio = 1 unless determined otherwise under 9VAC25- 260-140 F e = natural antilogarithm ln=natural logarithm CF = conversion factor a (acute) or c (chronic) CF a = 0.85 Sulfate (µg/l) Criterion to maintain acceptable taste, odor or aesthetic quality of drinking water and applies at the drinking water intake. Temperature See 9VAC25-260-50 1,1,2,2-Tetrachloroethane (µg/l) 79345 Known or suspected carcinogen; human health criteria at risk level 10 -5 ) AQUATIC LIFE FRESHWATER SALTWATER Public Water Acute 1 Chronic 2 Acute 1 Chronic 2 Supply 3 3.4; CaCO 3 = 100 1.9 X WER HUMAN HEALTH 250,000 All Other Surface Waters 4 1.7 40 32
9 VAC 25-260 - Virginia Water Quality Standards January 2011 Tetrachloroethylene (µg/l) 127184 Known or suspected carcinogen; human health criteria at risk level 10 -5 ) Thallium (µg/l) 7440280 Toluene (µg/l) 108883 Total Dissolved Solids (µg/l) Criterion to maintain acceptable taste, odor or aesthetic quality of drinking water and applies at the drinking water intake. 6.9 33 0.24 0.47 510 6,000 500,000 Toxaphene (µg/l) 8001352 Known or suspected 0.73 0.0002 0.21 0.0002 0.0028 0.0028 criteria at risk level 10 -5. carcinogen; human health Tributyltin (µg/l) 60105 0.46 0.072 0.42 0.0074 1, 2, 4 Trichlorobenzene (µg/l) 120821 35 70 1,1,2-Trichloroethane (µg/l) 79005 Known or suspected 5.9 160 criteria at risk level 10 -5. carcinogen; human health Trichloroethylene (µg/l) 79016 Known or suspected 25 300 criteria at risk level 10 -5. carcinogen; human health 2, 4, 6 –Trichlorophenol 88062 Known or suspected 14 24 criteria at risk level 10 -5. carcinogen; human health 2–(2, 4, 5 – Trichlorophenoxy propionic acid (Silvex) (µg/l) 93721 50 33
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