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May 4,2001 <br /> r <br /> WALLACE-KUHL <br /> &ASSOCI WES INC. Ms. Margaret Lagorio = n <br /> San Joaquin County Public Health Services !~. <br /> Geotechnical Engineering 304 East Weber Avenue, 3`d Floor <br /> Stockton, California 95202 <br /> Engineering Geology <br /> Well Destruction and Drum Removal <br /> Environmental Consulting 1444 MARIPOSA ROAD <br /> Stockton, California <br /> Remediation Services WKA No. 2938.08 <br /> Construction Inspection <br /> Dear Ms Lagorio, <br /> Materials Testing <br /> In accordance with State and County requirements,we have completed the <br /> abandonment of seven.monitoring wells and a vapor extraction system located at <br /> the above site. The wells were abandoned under the direct supervision of Mike <br /> Infurna of your department. Each well was pressure grouted with a neat cement <br /> slurry containing approximately 5%bentonite powder. Once grouted,the utility <br /> box was removed from each well,then the top three to five feet of casing was <br /> overdrilled. Finally,the overdrilled portion of each casing was topped with <br /> cement concrete to provide a protective surface cap. <br /> The vapor extraction system was filled with sand-cement slurry then also <br /> t overdrilled for the top three to five feet after removing the utility box. Again,the <br /> overdrilled portion of the vapor extraction system was backfilled with cement <br /> concrete to provide a protective surface cap. <br /> Nine soil and 15 water drums were disposed of on site in accordance with verbal <br /> authorization granted by your office. The soil was generated during the drilling of <br /> borings B5 and MW4 through MW7 in May of 1999. The water resulted from <br /> well purging during quarterly sampling events. Analytical review of data <br /> associated with the above field work revealed no significant concentrations of <br /> _ petroleum hydrocarbon-related compounds and as such were simply spread on site. <br /> It is our understanding that completion of the above tasks fulfills the last <br /> requirements for site closure. If you have any questions,please do not hesitate to <br /> contact me. <br /> CORPORATE OFFICE <br /> 3050 Industrial Blvd. Wallace-Kuhl&Associates,Inc. <br /> West Sacramento <br /> CA 95691 <br /> Tel 916.372.1434 <br /> Fax 916.372.2565 -,Ole — <br /> ROCKLIN OFFICE Kurt Balasek <br /> 500 Menlo Drive, Soor Hydrogeologist RG, CH <br /> Suite 100 r <br /> Rocklin,CA 95765 l <br /> Tel 916.435.9722 'Copies to: Dan Sweeney,United Rentals <br /> Fax 916.435.9822 Marty Hartfeld, CVRWQCB <br /> Recycled paper <br />