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GE <br /> GENESIS ENGINEERING & REDEVELOPMENT <br /> April 3, 2012 <br /> Ms.Adrienne Ellsaesser <br /> San Joaquin County Environmental Health Department <br /> 600 E. Main Street <br /> Stockton,California 95202 <br /> Subject: Revisions to Work Plan <br /> Former Arcady Oil Disposal Property <br /> Whiskey Slough Road, Holt,CA <br /> Dear Ms. Ellsaesser: <br /> Genesis Engineering&Redevelopment, Inc. has modified the proposed work scope for collecting soil <br /> samples to establish background soil concentrations for the former Arcady Oil Disposal Property because <br /> of the shallow groundwater encountered in the sampling location. Each borehole will now be advanced to <br /> a depth of 12 feet below grade using direct push drilling technology. A track mounted drill rig will be <br /> used to access the proposed boring locations. Continuous soil core will be collected for the purpose of <br /> lithologic logging. For the purpose of chemical testing, one six-inch long sample of native material will <br /> be collected from a selected depth interval below the water table at each borehole. In addition,a <br /> reconnaissance groundwater sample will be collected from a second borehole immediately adjacent to <br /> each initial borehole. The depth of the second borehole will be determined based on the depth interval <br /> selected for the soil sample from the adjoining borehole(the soil sample and the reconnaissance <br /> groundwater sample will be collected from the same depth intervals for each pair of borings). A total of <br /> 26 boreholes, 13 for soil sampling and 13 for reconnaissance groundwater sampling,will be advanced. <br /> Each borehole will be abandoned using hydrated bentonite,which will extend from the bottom of the <br /> borehole to approximately 5 feet below grade. The top of each borehole will be backfilled with native <br /> material. <br /> Copies of the laboratory reports and tabulated analytical data will be submitted to San Joaquin County <br /> Department of Environmental Health within 60 days of sample collection. <br /> If you have any questions or comments, please call me at(209)599-2004. <br /> Sincerely, <br /> Genesis Engineering&Redevelopment,Inc. <br /> �k__ <br /> DCooper <br /> Senior Project Manager <br /> Attachments <br /> Genesis Engineering&Redevelopment <br /> 351 Ruess Road,Ripon, California 95366 <br /> Phone:209.599.2004 • Fax 209.433.3990 <br />