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i <br /> San Joaquin County <br /> O <br /> ;19-"Y..c <br /> _ ..o EnviEnvironmentalEnvironmental Health Department DIRECTOR <br /> _. Donna Heran,,REhiS <br /> Q !�� . 1868 East Hazelton Avenue <br /> N' :{ PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco, REHS,RDI <br /> "' Kasey Foley,REHS <br /> 0.... :P Website: www.sigov.org/ehd Linda Turkatte, REHS <br /> F o R Phone:' (209)468-3420 Rodney Estrada,REHS <br /> Fax:,(209)464-0138, Adrienne Ellsaesser,REHS <br /> June,27, 2013 _ <br /> Mr. Wesley Parkinson <br /> Parkinson's 1-5 ARCO Service Station , <br /> 3250 West Hammer Lane C <br /> Stockton, California 95209: <br /> Subject: Parkinson's 1-5 ARCO Service Station , <br /> 3250 West Hammer Lane <br /> Stockton, California 95209 <br /> Dear.Mr. Parkinson: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Work Plan for Well Destruction (work plan), dated 21 June 2013, prepared by your consulting <br /> firm, Stratus Environmental, Inc. (Stratus), on your,behalf for the above-referenced site. The <br /> EHD had directed by letter dated 30 May 2013, the submittal of a scope of work proposal that <br /> detailed the condition and construction of the wells and the methods and materials to be used to <br /> destroy the wells. <br /> In the work pian, Stratus proposes to drill out monitoring wells MW-1 through MW-5 and MW-7 <br /> using eight-inch diameter augers, and nested injection wells IW-1A/B through IW-4 A/B using <br /> either ten- or twelve-inch diameter augers (to be determined in the field). Stratus proposes to <br /> seal the resulting boreholes to approximately six inches below surface grade (bsg) with neat <br /> cement or a cement grout mixture consisting of no more than two parts by weight sand and one <br /> part by weight cement in seven gallons of water.using a tremie pipe. <br /> Stratus proposes to destroy MW-6, constructed with a conductor casing, by: <br /> • Drilling out the well material inside and below the conductor casing to total depth of 64 <br /> feet bsg using eight-inch augers; <br /> • Excavating the area around the conductor casing to approximately three feet bsg and <br /> approximately 27 inches in diameter before cutting off the steel conductor casing and <br /> surrounding cement seal approximately six inches,above the base of the excavation; <br /> and <br /> • Filling the borehole from total depth to at least one foot above the base of the excavation <br /> with neat cement/cement grout. <br />