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We Nature ATTORNEY/CLIENT WORD PRODUCT 1710 Mails Street Escalon, CA 95324 Phone: (209)838-3507 FAX: (209)838-3549 October 6, 1992 Mr. Steven Schneider San Joaquin County Public Health Services, Environmental Health:Division P.O. Box 2009 Stockton, CA 95201 Re: C.M. Weber.Enterprises, Inc. property - 141 N. EI Dorado St., Stockton, CA - Revised Soil Closure Plan Dear Mr. Schneider: I am writing to transmit the results of our,recent confirmation boring activities at the referenced site and to request, on behalf of C. M. Weber-,Enterprises, Inc., San Joaquin County (County) concurrence with the proposed elements of a Revised Soil Closure Pian outlined herein. In accordance with the Soil Closure Workplan'(the "Workplan") dated July 30th, 1992 RESNA Industries, Inc. (RESNA) supervised the drilling and sampling of nine confirmation soil borings at the referenced site on September 3rd and 4th; 1992. The locations of the borings were agreed upon by Ms. Tina LePage of RESNA and yourself. The.purpose of the'borings was to gather empirical data on contaminant concentrations remaining in the soil after eight months of vapor extraction system operation. It was proposed:jn the Workplan that the soil problem identified at the site be treated as an issue separate from groundwater. RESNA anticipated requesting soil closure if the results of the confirmation borings indicated contaminants in the soil had been reduced to insignificant levels. During drilling of the nine confirmation.soil.horings (CB-1 through CB-9) a photoionization detector (PID) was used to field screen soil samples for laboratory analysis. Samples selected from each boring for laboratory analysis:were"those exhibiting the highest PID readings or, in the case of no PID indications of contamination, samples collected from`.approximately 20 feet and 32 feet below grade. The selected `samples were .analyzed by RESNA Environmental Laboratories for TPHG/BTEX using EPA 801`5!8020 methodologies.