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F <br /> W. Graffigna Jr. and Wilin Graffigna' -3- April 30, 2009 <br /> Claim No. 13578 <br /> i <br /> A. Soil Excavation- unknown volume <br /> B. In-Situ Soil Remediation: � 0�� <br /> METHOD: soil vapor extraction <br /> • DURATION: Oct 06 through present <br /> • INITIAL INFLUENT CONCENTRATION: 7,300 ug/I TPHG, _5,900 ug/l MTBE <br /> • CURRENT INFLUENT CONCENTRATION: <50 ugll TPHG, 63-ug/l MTBE I <br /> C. Groundwater Remediation: <br /> • METHOD: batch extraction <br /> • DURATION: 2005 through present <br /> • VOLUME OF GROUNDWATER REMOVED: 373,590 gallons <br /> • MASS OF TPH-G REMOVED: 97 pounds MTBE -� <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below <br /> METHYL TERT,BUTYL ETHER'(MTBE) Results for MVV2 <br /> 200000. <br /> 1 <br /> 1 _ _ <br /> aB <br /> If <br /> 160006- <br /> 140000: <br /> 7` <br /> °�2000a „k T 52 z ig <br /> _00000,7 54 <br /> m 80000, -- 58 <br /> S00D0. g <br /> 40000 s -. <br /> B0 <br /> 20000' .. <br /> fit <br /> METHYL-TERT=BUTYL.ETHER(MTBE) +� Depth to'Water <br /> VII. SENSITIVE RECEPTOR SURVEY: one well identified within % mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: retail gasoline station <br /> B. Site History: the extent of groundwater contamination is undefined to the south <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction and batch extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> California Environmental Protection Agency <br /> fir?Rmyded Pape, <br />