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The drinking water standard is 20,000 picocuries.
"Despite this widespread contamination, the US currently has no national drinking water standard for chromium-6".
A 2011 Penn State study found that about 40% of water wells tested prior to gas drilling failed at least one federal drinking water standard.
So the E.P.A. does not allow carbon dioxide to be injected into underground water supplies that meet the drinking water standard.
Today, the agency said it had asked the National Academy of Sciences "to perform an expedited review of a range of 3 to 20 parts per billion for the establishment of a new drinking water standard".
Documents reviewed by The Times in February indicate that the Johnstown plant has accepted wastewater with levels of alpha radioactivity roughly 2,157 times higher than the drinking water standard.
At one plant in Pennsylvania, documents from the Environmental Protection Agency revealed levels of benzene roughly 28 times the federal drinking water standard in wastewater as it was discharged, after treatment, into the Allegheny River in May 2008.
This was done to mimic the drinking water standard.
The effluent were all far below the permitted concentration level in the current drinking water standard.
Only the Cmax of Cl and Na exceed the drinking water standard.
In the Low release rate case, only Br and Ba exceed the drinking water standard.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com