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Valley Motors =3- March 21, 2011 <br /> Claim No. 12540 <br /> j <br /> i C. Groundwater Remediation: <br /> METHOD 1: air sparging pilot test, ineffective <br /> • METHOD 2: groundwater extraction pilot test <br /> • DURATION: June, August, October, November 2009 . <br />! • VOLUME OF GROUNDWATER REMOVED: 32,625 gallons <br /> D. Groundwater Trends: Benzene trends are shown below, source and down <br /> gradient, respectively. <br /> BENZENE Results for VM-2 <br /> 10000- <br /> 8000--- <br /> 7000-- <br /> 5000- <br /> 4000 <br /> 00008000 7000 50004000...,,.___. .. .< .---.__ ..__.._.. .. :__..... .y..,..,-.__.._....._ __. ..._._--._......._...._._..._-... -. <br /> 3000....----....----—..------- ---------- <br /> 2000--- <br /> 1000 <br /> --._..._2000 -1000 <br /> �- BENZENE . <br /> BENZENE Results for VM-4 <br /> 400 <br /> 350 .. ..._._--. --....,_..-. ... ...... __,_.,..._._.. <br /> i <br /> 300 <br /> -�250 <br /> CJ I. <br /> � f <br /> 200 4 <br /> 150 ..._,. .. _ ----- <br /> 0-1 <br /> _---0 <br /> I <br /> "- - - BENZENE . <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: active retail gasoline station <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> California En vironmental Protection Agency <br /> Z.*Recycled Paper <br />