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,I <br /> 4 <br /> r� <br /> 6 <br /> K4WEISS ASSOCIATES Consulting in Geology F Geohydrology <br /> 2938 McClure Street, Oakland, Cry 94609 415.465-1100 <br /> i, <br /> _ r, <br /> March 30, 1988rl.jtflt; <br /> 7rs� _cf3SLTll <br /> Julian Munoz, Plant Engineer <br /> E ER,%m/SE't V;C' <br /> Safeway Stores <br /> 1111 Navy Drive <br /> Stockton, CA 95024 <br /> Re: Subsurface Investigation <br /> 1.111 Navy Drive, Stockton, CA <br /> WA Job #44-245-03 <br /> Dear Hr. Munoz: <br /> This letter presents the results of the sampling conducted between 12 and <br /> 15 March 1988 by Weiss Associates (WA) and Precision Industries of Stockton, <br /> CA (PI) at tile Safeway bleat Packing facility at 1111 Navy Drive, Stockton, <br /> California. To determine whether a concrete slab encountered at the bottom of <br /> the fuel tank excavation can be left in place, the San Joaquin Local Health <br /> District (SJLHD) requested hydrocarbon analysis of native soil from beneath <br /> the slab. The work included the following tasks: <br /> J <br /> 1) Install temporary shoring in the excavation and expose the slab by <br /> pumping water from the excavation and discharging it to the sanitary <br /> sewer. <br /> 2) Core eight holes through the concrete slab in the vicinity of the <br /> ends of the former tanks. <br /> 3) Collect samples of native soil from six inches to one foot below the <br /> slab by driving steam-cleaned brass tubes through the coreholes. <br />