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 Malathion (µg/l) 121755 Manganese (µg/l) 7439965 Criterion to maintain acceptable taste, odor or aesthetic quality of drinking water and applies at the drinking water intake. Mercury (µg/l) 5 7439976 Methyl Bromide (µg/l) 74839 Methyl Mercury (Fish Tissue Criterion mg/kg) 8 22967926 Methylene Chloride (µg/l) 75092 Known or suspected carcinogen; human health criteria at risk level 10 -5 Synonym = Dichloromethane Methoxychlor (µg/l) 72435 Mirex (µg/l) 2385855 AQUATIC LIFE FRESHWATER SALTWATER Public Water Acute 1 Chronic 2 Acute 1 Chronic 2 Supply 3 0.1 0.1 1.4 0.77 1.8 0.94 HUMAN HEALTH 50 0.03 0.03 100 zero zero All Other Surface Waters 4 47 1,500 0.30 0.30 46 5,900 28
9 VAC 25-260 - Virginia Water Quality Standards January 2011 USE DESIGNATION PARAMETER CAS Number Nickel (µg/l) 5 744002 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 {0.8460[In(hardness)] + 1.312} ] (CF a ) AQUATIC LIFE FRESHWATER SALTWATER Public Water Acute 1 Chronic 2 Acute 1 Chronic 2 Supply 3 180 CaCO 3 = 100 20 CaCO 3 = 100 74 X WER 8.2 X WER HUMAN HEALTH All Other Surface Waters 4 610 4,600 Freshwater chronic criterion (µg/l) WER [e {0.8460[In(hardness)] - 0.8840} ] (CF c ) 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 = 0.998 CF c = 0.997 Nitrate as N (µg/l) 14797558 Nitrobenzene (µg/l) 98953 N-Nitrosodimethylamine (µg/l) 62759 10,000 17 690 Known or suspected 0.0069 30 carcinogen; human health 29
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