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San Joaquin County <br /> Environmental Health Department DrRecroR <br /> P���N• Donna Heran,RENS <br /> 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> W < Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDt <br /> Kasey Foley,REHS <br /> c •.- �P Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> September 5, 2012 <br /> Mr. David B. Atwater <br /> Van De Pol Enterprises, Inc. <br /> Post Office Box 1107 <br /> Stockton, California 95201 <br /> Subject: Former California Fuels Cardlock Station <br /> 2402 Pacific Avenue <br /> Stockton, California 95204 <br /> Dear Mr. Atwater: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Well Destruction Work Plan (work plan), dated 02 August 2012, prepared by your consulting <br /> firm, Advanced GeoEnviron mental, Inc. (AGE), on your behalf for the above-referenced site. <br /> The work plan was submitted in response to the EHD letter dated 20 July 2012 directing the <br /> submittal of a scope of work proposal that details the conditions and construction of the wells <br /> and the methods and materials to be used to destroy them. <br /> In the work plan, AGE proposed to pressure grout MW-4, MW-5, MW-7, MW-8, MW-9, <br /> MW-10, MW-11, MW-12, VW-3, VW-4, VW-5, VW-6, VW-7, AW-3, W 4, AW-S) AW-6 and <br /> AW-7; and drill out MW-1, MW-2, MW-3, MW-6, MW-13A/B/C, VW-1, VW-2, AW-IAIB, <br /> AW-2A/B and EW-1. <br /> Upon review of historical soil and groundwater analytical data and well construction logs, the <br /> EHD directs the following revisions to the work plan: <br /> • Over-drill AW-4 to total depth of 44 feet below surface grade (bsg) and AW-5 to total <br /> depth of 41 feet bsg, instead of destroying these two wells by pressure grouting since <br /> these wells are located in an area of known or suspected contamination and there is <br /> no pre-remediation or post-remediation soil and groundwater data available from their <br /> locations; <br /> • First pressure grout multi-level chamber well MW-13A/B/C using a thin-grout mixture, <br /> then over-drill this well using ten-inch or larger diameter augers to total depth of 150 <br /> feet below surface grade (bsg); (Note that MW-13 was initially installed using ten-inch <br /> augers but was over-drilled using eight-inch augers to install multi-level chamber well <br /> MW-13A/B/C.) and <br /> • Over-drill EW-1 to total depth of 65 feet bsg using fifteen-inch or larger diameter <br /> augers. <br />