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Advanced <br /> GeoEnvironnle t, la, Inc. <br /> !2: 3 S <br /> 02 June 1998 <br /> AGE-NC Project No. 95-0104 <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services - Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 - <br /> Subject: Soil Vapor Extraction Pilot Study <br /> P17arlowe Property-4648 East Waterloo Road,Stockton, California <br /> Dear Ms. Duncan: <br /> At the request of Mr.Jonathan Marlowe and suggestion of Ms.Margaret Lagorio of your office(San Joaquin <br /> County Public Health Services- Environmental Health Division: PHS-EHD),Advanced GeoEnvironmental, <br /> Inc. (AGE) proposes the actions outlined below to address hydrocarbon-impacted soil underlying the <br /> property located at 4648 East Waterloo Road (site). Hydrocarbon-impacted soil and ground water has been <br /> characterized on the site and the impacted ground water is being monitored. Concern for several drinking <br /> water wells in close proximity to the site has prompted your office to request Mr. Marlowe to address the <br /> plwne to provide a higher degree of protection for the wells. <br /> AGE submitted a corrective action plan dated December 1995 to the PHS-EHD that proposes soil vapor <br /> extraction (SVE)and air sparging(AS)as the most effective means of addressing the soil and ground water <br /> plume. Several addendums to the CAP have been prepared to evaluate the cost effectiveness iar an <br /> excavation approach. Recently, you and Ms. Lagorio visited the site and noted that excavation would <br /> severely disrupt commercial site usage, destroy existing monitoring and soii vapor extraction wens, and <br /> would endanger an overhead electric line; an assessment of the situation with which AGE concurs. At our <br /> meeting with you and Ms. Lagorio at your office on 22 May 1998, it was mutually agreed that SVE/AS <br /> should be reconsidered as the best approach to economically and effectively address tete ongoing problem. <br /> Since AGE conducted an SVE test in March 1995,ground water has risen approximately 18 feet, increasing ' <br /> the interval of impacted soil in the saturated zone and reducing the volume of impacted soil in the vadose <br /> zone, where SVE is most effective. These changes are anticipated to have profoundly affected the site <br /> response to SVE and AS; therefore an updated SVE test should be conducted to evaluate the method <br /> effectiveness, radius of influence, and the additional effect of AS. The consensus at our 22 May 1998 <br /> meeting was that an extended SVE/AS pilot test would be an appropriate action to take at this time to address <br /> the site situation. This approach at this time has several advantages: <br /> 1. A vapor extraction well is currently installed and available to immediately initiate a soil vapor <br /> extraction (SVE)and air sparging(AS) pilot test; <br /> 4005 North Wilson Way, Stockton,California 95205 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />