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RMB Garage -3- September 16 , 2010 <br /> Claim No . 16768 <br /> A. Soil Excavation : unknown volume <br /> B . In -Situ Soil/ Groundwater Remediation : <br /> • METHOD : dual phase extraction <br /> DURATION : Sep 08 through present, intermittent <br /> • VOLUME OF GROUNDWATER REMOVED : 628 , 080 gallons (June 2010) <br /> • POUNDS OF TPH -G REMOVED : 15 , 962 pounds (June 2010) <br /> RATE OF HYDROCARBON REMOVAL : 2 pounds/day <br /> C . Groundwater Trends : Benzene trends are shown below, source area and down <br /> gradient, respectively. <br /> 1� <br /> BENZENE Results forMW3 <br /> 350000 - <br /> 300000 . <br /> 250000 - <br /> 200000 - <br /> 150000 - - <br /> 100000 <br /> 50000 200000 150000 100000 - - - - - - <br /> I I <br /> 50000 <br /> sE <br /> f -- BENZENE J <br /> - BENZENE Results for MW5 <br /> 450001 <br /> -�40006 - - { - I . - ------ <br /> 35000 - <br /> 30000 - <br /> 35o06 30000 - <br /> c0 . ... — <br /> = 26000 i --1 I <br /> N 20000 -_.—._ + .___--4 1 _ J <br /> � 15000 <br /> t — — <br /> 10000 ' ---. ...- <br /> - <br /> ape 40e 44e <br /> p4e 04e �4e Zoe <br /> �.._• BENZENE ' - - <br /> I LLL <br /> j VII . COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description : former service station <br /> B . Site History : the extent of groundwater contamination is defined <br /> C . Groundwater Monitoring Summary : strong monitoring history <br /> D . Remediation Summary : dual phase extraction <br /> Cal forma Environmental Protection Agency <br /> Awa Recycled Paper <br />