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

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9 VAC 25-260 - Virginia Water Quality Standards January 2011 PARAMETER CAS Number Hexachlorobutadiene (µg/l) 87683 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Hexachlorocyclohexane Alpha-BHC (µg/l) 319846 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Hexachlorocyclohexane Beta-BHC (µg/l) 319857 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Hexachlorocyclohexane (µg/l) (Lindane) Gamma-BHC 58899 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Hexachlorocyclopentadiene (µg/l) 77474 Hexachloroethane (µg/l) 67721 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Hydrogen sulfide (µg/l) 7783064 Indeno (1,2,3,-cd) pyrene (µg/l) 193395 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 4.4 180 0.026 0.049 0.091 0.17 0.95 0.16 0.98 1.8 2.0 2.0 40 1,100 14 33 Known or suspected 0.038 0.18 carcinogen; human health 26
9 VAC 25-260 - Virginia Water Quality Standards January 2011 USE DESIGNATION PARAMETER CAS Number Iron (µg/l) 7439896 Criterion to maintain acceptable taste, odor or aesthetic quality of drinking water and applies at the drinking water intake. Isophorone (µg/l) 78591 Known or suspected carcinogen; human health criteria at risk level 10 -5 . Kepone (µg/l) 143500 Lead (µg/l) 5 7439921 Freshwater values are a function of total hardness as calcium carbonate CaCO 3 mg/l and the water effect ratio. 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 {1.273[In(hardness)]-1.084} ] Freshwater chronic criterion (µg/l) WER [e {1.273[In(hardness)]-3.259} ] WER = Water Effect Ratio = 1 unless determined otherwise under 9VAC25- 260-140 F e = natural antilogarithm ln = natural logarithm AQUATIC LIFE FRESHWATER SALTWATER Public Water Acute 1 Chronic 2 Acute 1 Chronic 2 Supply 3 120 CaCO 3 = 100 zero 14 CaCO 3 = 100 240 X WER zero 9.3 X WER HUMAN HEALTH 300 All Other Surface Waters 4 350 9,600 15 27
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