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EPA TO Methods http://www.epa.gov/ttn/amtic/airtox.html
EPA Method 25C http://www.epa.gov/ttn/emc/promgate/m-25c.pdf
NELAC http://www.epa.gov/nelac
Air and Waste Management Association http://www.awma.org
California Air Resources Board (CARB) http://www.arb.ca.gov
EPA Vapor Intrusion draft guidance http://www.epa.gov/correctiveaction/eis/vapor.htm
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