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lecture10 - Lecture 10 Soil vapor extraction, air sparging,...

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Unformatted text preview: Lecture 10 Soil vapor extraction, air sparging, and soil flushing Air stripper in Acton, MA. It is installed on an Acton public supply well affected by the W.R. Grace Superfund Site. Image courtesy of Peter Shanahan. 1,1-DCE Plume in Palo Alto, California >10,000 ppb >1000 ppb >100 ppb >10 ppb CONCENTRATION OF 1,1-DCE Monitoring well Capture Zone Model Limit of Capture Zone Well Well W6 W3 Plume after Pump and Treat Starts >1000 ppb >100 ppb >10 ppb >1 ppb CONCENTRATION OF 1,1-DCE Concentrations in Withdrawal Wells 1000 2000 3000 4000 5000 6000 7000 8000 12/15/1987 12/14/1988 12/15/1989 12/15/1990 Concentration (ug/L) 1,1-DCE in W3 1,1,1-TCA in W3 1,1-DCE in W6 1,1,1-TCA in W6 Concentrations in Withdrawal Wells 100 200 300 400 500 600 700 800 900 1000 12/15/1987 12/14/1988 12/15/1989 12/15/1990 Concentration (ug/L) 1,1-DCE in W3 1,1,1-TCA in W3 1,1-DCE in W6 1,1,1-TCA in W6 MCL for 1,1-DCE MCL for 1,1,1-TCA 6/1/93 1/1/94 6/1/94 1/1/95 6/1/95 4000 8000 12000 16000 20000 Concent ation of TCE (ug L) 6/1/93 1/1/94 6/1/94 1/1/95 6/1/95 400 800 1200 Concentration of TCE (ug/L) Legend Recovery Well 1 Recovery Well 2 MCL for TCE - 5 ug/L Concentrations in Pump and Treat Recovery Wells at manufacturing facility, Hutchinson, Kansas Historical Recognition of Limitations of Pump & Treat 1989 Articles in Ground Water and ES&T question pump and treat remediation 1989 EPA review finds only 1 out of 19 systems reached cleanup goals 1991 EPA holds seminars on DNAPLs 1992 EPA issues Estimating Potential for DNAPLs at Superfund Sites 1993 EPA issues Technical Impracticability guidance 1994 National Research Council study finds 69 out of 77 systems did not reach cleanup Source: U.S. EPA, 2002. Groundwater Remedies Selected at Superfund Sites. Report No. EPA-542-R-01-022. Office of Solid Waste and Emergency Response....
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lecture10 - Lecture 10 Soil vapor extraction, air sparging,...

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