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'Ile 0_ <br /> a cii vision <br /> ENVIRONMENTAL SOLUTIONS of <br /> Lmcon <br /> June 22, 1998 <br /> Project 20805-142.008 <br /> Ms..Jeannie Matsumoto <br /> City of Lodi <br /> Department of Public Works <br /> Development and Permit Services <br /> 221 West Pine Street <br /> PO Box 3006 <br /> Lodi, California.95241 <br /> Re: Encroachment Permit for Well Destruction, ARCO Service Station No. 760, <br /> 225 South Cherokee Lane, Lodi, California <br /> Dear Ms. Matsumoto: <br /> Pinnacle Environmental.Solutions, a division of EMCON, (Pinnacle),has prepared this <br /> workplan for abandonment of off-site vapor extraction well VW-6 located in the City of <br /> Lodi alley to the north of ARCO Products Company (ARCO) Station No. 760, located at <br /> 225 South Cherokee Lane, Lodi, California (see Figures 1 and 2). The well is a 4-inch <br /> diameter well constructed using schedule 40 PVC casing to a depth of 26 feet below <br /> ground surface (bgs). The construction records show that the well has a screened interval <br /> between 23 and 26 feet bgs. <br /> Abandonment of this well is being proposed at ARCO's request and will be conducted <br /> consistent with San Joaquin County Public Health Services, Environmental Health <br /> Division standards. Well abandonment activities will be performed by a <br /> California-licensed drilling contractor under the supervision of Pinnacle personnel. Traffic <br /> control will be used to close the alley during the well abandonment activities and <br /> abandonment will take approximately 2 to 3 hours to complete. The proposed <br /> abandonment methods are presented in the following paragraph. <br /> The well will be drilled out using 8-inch diameter hollow stem auger drilling equipment to <br /> remove the seal, casing, and filter pack material to the total well depth of 26 bgs. Upon <br /> completion of the drill out, the borehole will be sealed using neat cement grout placed <br /> through a tremie pipe from the base of the borehole to within 5 feet of ground surface. The <br /> upper 5 feet of the borehole will be backfilled with cuttings and a three inch-thick asphalt <br /> seal will be placed over the borehole. <br /> SAC%AAL0D1_PMT.D0C-96\mtt:1 <br /> 3939 Cambridge Road,Suite 220 Cameron Park,California 95682 (530)676-6884 (530)676-6885 Fax <br /> m <br />