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WE/SS ASSOCIATES Consulting in Geology 6 Geohydrofogy <br /> 2938 McClure Street, Oakland, CA 94609 415-465-1100 <br /> ENVIRO\rti• fAL HEALTH <br /> FERMIT/SERVICES <br /> 1 March 1988 <br /> Julian Munoz, Plant Engineer <br /> Safeway Stores <br /> 1111 Navy Drive <br /> Stockton, CA 95024 <br /> Re: Excavation Closure <br /> 1111 Navy Drive, Stockton, CA <br /> WA Job # 44-245 <br /> Dear Mr. Munoz: <br /> As we discussed on 24 February 1988, this letter presents the <br /> additions to our 10 February 1988 proposal for closure of the diesel tank <br /> excavation. Dave Carls of the San Joaquin Local Health District (SJLHD) <br /> requested that we collect soil samples from below the concrete slab in the <br /> excavation to determine whether hydrocarbons are present there. Therefore, <br /> we propose to: <br /> 1) Install a temporary shoring in the excavation to protect workers <br /> from a failure of the excavation walls and expose the slab by <br /> pumping water from the excavation and discharging it to the <br /> sanitary 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 one to two feet below the <br /> slab by driving steam-cleaned brass tubes through the coreholes; <br /> 4) Composite the eight samples into four samples for analysis by <br /> modified EPA Method 8015, gas chromatography with flame <br /> ionization detection (GC/FID) at Brown and Caldwell Analytical <br /> Laboratories of Emeryville, California (B&C) ; and <br /> 5) Report the results of this phase of the investigation. <br /> Precision Industries of Stockton, California will install the <br /> temporary shoring, expose the slab, and core the holes through the slab <br /> under separate contract to Safeway Stores. Weiss Associates will collect <br /> the soil samples for analysis and prepare the report. An extra-scope-of-work <br /> budget for these additional tasks will be forwarded to you under separate <br /> cover. <br /> A Division of AguaTierra Associates Incorporated <br />