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r <br /> Shaw Environmental, Inc. <br /> 4005 Port Chicago Highway <br /> © Concord, California 94520-1120 <br /> h1W® Phone:925.288.9898 <br /> Shaw Environmental, Inc. MAR 1 20Q8 Fax:925.288.0888 <br /> P Qf11"11" JT HEALTH <br /> PERM!T'SER�/Im� <br /> March 11, 2008 Shaw Project No. 128771.08 <br /> Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> Subject: Well Permit Application <br /> The Transmission Shop <br /> 515 West Charter Way <br /> Stockton, California <br /> Dear Ms. Lagorio: <br /> Please find enclosed the Work Plan and Well Permit Application for the above- <br /> mentioned facility. The Well Permit Application is being submitted following Central <br /> Valley Regional Water Quality Control Board (RWQCB) approval of the Work Plan for <br /> Further Delineation of Groundwater Petroleum Hydrocarbon Plume, The Transmission <br /> Shop, Stockton, California. <br /> Minor changes to well drilling has been planned in response to recommendations from <br /> the drilling subcontractor. Due to the limited size of the site, the use of air rotary drill <br /> rigs is not feasible. Therefore a hollow stem auger rig will be used to complete not only <br /> the 1 shallow and 3 intermediate wells, but also to complete the 2 deep wells. The <br /> procedure for the two deep wells is as follows. <br /> Each deep well will be bored to 70 feet below ground surface (bgs)through the use of a <br /> nominal 14-inch (o.d.) hollow stem auger. Permanent mild steel conductor casing will be <br /> welded and installed concurrently. Upon attaining 70 feet bgs the permanent conductor <br /> casing will be grouted in place. The grout will be allowed to set for a minimum of 24 <br /> hours. Following grout set up a nominal 8-inch auger will be used to drill within the <br /> conductor casing and will be driven to a total depth of 90 feet bgs. Each well will then be <br /> constructed as outlined in the work plan. <br /> The use of permanent conductor casing will prevent the potential migration of <br /> contaminants in the vertical direction. The only variation from the Work Plan is that this <br /> approach will use hollow stem auger drilling methods instead of air rotary drilling <br /> methods. Again, the limited size of the site precluded the use of an air rotary drilling rig. <br />