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H� OGEOL o <br /> A GROUNDWATER CONSULTANCY <br /> Mr. Harlan Knoll, R.E.H.S. February 09, 2005 <br /> Senior Registered Environmental Health Specialist <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE: Workplan for Preliminary Soil and Groundwater Characterization at Former <br /> Diesel Tank Removal Soil—Nelson Ready Mix, 2059 Navy Drive, Stockton, <br /> California. <br /> Dear Mr. Knoll; <br /> This workplan for preliminary soil and groundwater characterization at the site of an <br /> earlier diesel tank removal at Nelson Ready Mix, located at 2059 Navy Drive in <br /> Stockton, California is submitted on behalf of R. B. Construction, Inc. <br /> Figure 1 identifies the former diesel tank location and soil and pit water sample locations <br /> and analytical results from samples collected February 20, 2004 and reported on March 8, <br /> 2004. <br /> The depth to first encountered groundwater at the site was reported as being about 11 to <br /> 12 feet beneath the surface by the source removal contractor. Since the soils in this depth <br /> range have been reported as fine grained, soil sampling boreholes for implementation of <br /> the present work plan will be implemented by hand operated tools as described below. <br /> One hand augered 4-inch borehole is proposed for each of the three assessable sides of <br /> the open source removal excavation. One soil sample will be collected from within the <br /> depth range of the elevation of the standing water in the adjacent pit and first encountered <br /> groundwater in each borehole. It is also proposed that a 2-inch casing and screen <br /> assembly be placed in each open borehole to allow stabilization of groundwater levels <br /> and collection of groundwater samples. <br /> Soil and groundwater samples will be analyzed for Total Extractable Petroleum <br /> Hydrocarbons in the diesel range(TEPH-diesel)by U.S. EPA Method 8015M by STL <br /> San Francisco(CA DHS ELAP#2496) of Pleasanton, California. <br /> P.O.Box 2165 ■ Livermore.California 94551-2165 ■ (925)373-9211 <br /> Zz <br />