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San Joaquin County PQ'ui" Environmental Health Department DIRECTOR Donna Heran,REHS r.' y 1868 East Hazelton Avenue a: "A PROGRAM COORDINATORS N- < Stockton, California 95205-6232 Robert McClellon,REHS •' Jeff Carruesco,REHS,RDI �4 :P Website: www.sjgov.org/ehd Kasey Foley,REHS Phone: (209)468-3420 Linda Turkatte,RENS Fax: (209)464-0138 February 1, 2013D ITi�MIIVT FEB 0 4 2013 Ms. Beverly Garcia BY..................... Raymond Investment Corporation Post Office Box 567 Stockton, Califomia 95201 Subject: Raymond Investment Corporation 730 Channel Street Stockton, California 95202 Dear Ms. Garcia: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Monitoring Well Destruction Work Plan (work plan), dated 20 November 2012, prepared and submitted by your consulting firm, Condor Earth Technologies, Inc. (Condor) on your behalf for the above-referenced site. The EHD had directed the submittal of a well destruction work plan by letter dated 18 October 2012. In the work plan, Condor proposes to destroy monitoring wells MW4 and MW-5 by removing the well components by over-drilling the wells before backfilling the borehole with neat cement from the bottom upward. Since contaminants of concern were not detected in groundwater samples collected during the most recent sampling events, Condor proposes to destroy MW-1, MW-2, MW-3R, MW-4D, MW-6 and MW-7 by: Pressure grouting the well casings with neat cement from the bottom upward; Then removing the top three feet of the well casing and cement; • Followed by removing an additional six inches of cement below the depth where the casing has been removed; and Filling the borehole with neat cement to one foot below surface grade (bsg). Condor proposes to destroy the three soil vapor wells SV-4, SV-5 and SV-6 by over-drilling the wells with a four-inch hand auger, then backfilling the borehole with neat cement. The San Joaquin County Well Standards require removing the well contents as the method of destruction if the well is in an area of known or suspected contamination. The EHD has reviewed the site soil data to determine if the wells proposed for destruction by pressure grouting qualify for that destruction method. The EHD determined that the following wells qualify for destruction by pressure grouting: MW-1, MW-3R and MW-7. Prior to destroying the wells, check each one for obstructions and if found, remove the obstructions. If obstructions cannot be removed, the well must be destroyed by removal of all the well contents. The EHD