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Rainwater CarwasTi -4- 00 May 5, 2009 <br /> Claim No. 14719 <br /> C. Groundwater Remediation: <br /> • METHOD: groundwater extraction <br /> • DURATION: Jan 02 through Sep 07 <br /> • VOLUME OF GROUNDWATER REMOVED: 9,697,873 gallons (Sep 08) <br /> • MASS OF MTBE REMOVED: 322 pounds (Sep 08) <br /> • RATE OF MTBE REMOVAL: 2.3 pounds/month <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below: <br /> METHYL-TERT-BUTYL ETHER (MTBE) Results for MW2 <br /> 350000 10 <br /> I,,.. 12 <br /> 300000 l _... <br /> 14 <br /> 250000 _. . _I __ 16 <br /> �3 ',. 18 <br /> 200000 <br /> 120 c <br /> 150000 —... # 22 <br /> K 24 <br /> 100000 - <br /> 26 <br /> 50000 -- r' ��—..: 28 <br /> � <br /> y,. l .. 30 <br /> —.—. METHYL-TERT-BUTYL ETHER(MTBE) Depth to Water <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within 1/z mile of the site <br /> Vlll. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, car wash <br /> B. Site History: the extent of groundwater contamination is poorly defined to the <br /> northwest <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: groundwater extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In May 2008, the Fund made the following recommendation: This site has 47 <br /> monitoring points. Trends have been long established for these wells and the <br /> Fund recommends the Responsible Party reduce the monitoring frequency of <br /> many of these nested wells. The Fund also recommends that the San Joaquin <br /> County LOP direct the Responsible Party to add an additional remedial <br /> California Environmental Protection Agency <br /> P.d Recycled Paper <br />