Virginia Water Quality Standards - Water - US Environmental ...
Virginia Water Quality Standards - Water - US Environmental ...
Virginia Water Quality Standards - Water - US Environmental ...
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9 VAC 25-260 - <strong>Virginia</strong> <strong>Water</strong> <strong>Quality</strong> <strong>Standards</strong><br />
January 2011<br />
PARAMETER<br />
CAS Number<br />
Chromium III (µg/l) 5<br />
16065831<br />
Freshwater values are a<br />
function of total hardness as<br />
calcium carbonate CaCO 3<br />
mg/l and the WER. The<br />
minimum hardness allowed<br />
for use in the equation<br />
below shall be 25 and the<br />
maximum hardness shall be<br />
400 even when the actual<br />
ambient hardness is less<br />
than 25 or greater than 400.<br />
Freshwater acute criterion<br />
µg/l<br />
WER [e {0.8190[In(hardness)]+3.7256} ]<br />
(CF a )<br />
Freshwater chronic criterion<br />
µg/l<br />
WER [e {0.8190[In(hardness)]+0.6848} ]<br />
(CF c )<br />
WER = <strong>Water</strong> Effect Ratio =<br />
1 unless determined<br />
otherwise under 9VAC25-<br />
260-140.F<br />
e = natural antilogarithm<br />
ln=natural logarithm<br />
CF = conversion factor a<br />
(acute) or c (chronic)<br />
CF a = 0.316<br />
CF c =0.860<br />
Chromium VI (µg/l) 5<br />
18540299<br />
Chrysene (µg/l)<br />
218019<br />
AQUATIC LIFE<br />
<strong>US</strong>E DESIGNATION<br />
FRESHWATER SALTWATER Public<br />
<strong>Water</strong><br />
Acute 1 Chronic 2 Acute 1 Chronic 2<br />
Supply 3<br />
570<br />
(CaCO 3<br />
= 100)<br />
74<br />
(CaCO 3<br />
= 100)<br />
16 11 1,100 50<br />
HUMAN HEALTH<br />
100<br />
(total<br />
Cr)<br />
All Other<br />
Surface<br />
<strong>Water</strong>s 4<br />
Known or suspected<br />
0.0038 0.018<br />
criteria at risk level 10 -5.<br />
carcinogen; human health<br />
20
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