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WESTERN 1386 1-AS I BLAMER S i RLL I <br /> GEO-ENGINEERS WOODI AND CA 95776-6003 <br /> WHE0 - 1h (530) 668-5300, <br /> . CALIF CONTRACI OR#513857 - 1 AX(530)662-0273 <br /> REGIS FERED GEOI OG IS IS wegea mother corn <br /> Mr Michael J Infurna Jr September 27, 1999 <br /> Senior REHS <br /> LOP/Site Mitigation Unit IV <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Sanchez Property, 1876 Country Club Blvd , Stockton, CA <br /> Dear Mr Infurna <br /> Please find enclosed one copy of the April-June 1999 Quarterly Groundwater Monitoring <br /> Report for the Sanchez Property, 1876 Country Club Blvd , Stockton, CA <br /> The recommendations of the report Include conducting a pump test and an air <br /> sparging;/vapor extraction pilot test The pilot test will utilize several of the existing <br /> monitor wells for air sparging and will require the installation of horizontal piping within <br /> a shallow trench that traverses the soil contamination plume to collect soil vapors <br /> WEGE believes that these tests are necessary to provide an unbiased feasibility study that <br /> will compare the cost effectiveness of the following three remedial technologies for the <br /> site direct excavation with on-site soil treatment, air sparging in conjunction with vapor <br /> extraction, and the injection of oxygen release compounds into the soil contamination <br /> plume <br /> I am in the process of putting together cost estimates that will be submitted to the UST <br /> Cleanup Fund for conducting the two tests and preparing a feasibility study I also intend <br /> to request funds for installing an additional offsite monitor well west of MW1 to further <br /> define the downgradient extent of the groundwater contamination plume <br /> Please let me know if your office has any objections or further suggestions for conducting <br /> these tests and completing a feasibility/cost effectiveness study of the remedial <br /> alternatives <br /> Sincerely, <br /> David T relfall <br /> Western Geo-Engineers <br /> 10 Cc Mr and Mrs Manuel Sanchez <br />