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2.3 Map showing general site features: <br /> The site plan is presented in Figure 2. <br /> 2 4 Estimates of liquid quantityand <br /> composition leaked: <br /> w No estimate of the liquid quantity leaked can be made with exist- <br /> ing information. The constituents detected in the initial soil <br /> samples appear to be derived from diesel fuel. <br /> 2.5 Topography, geology, surface water, depth to groundwater: <br /> The site is situated on level terrain underlain by flood basin <br /> deposits of Pleistocene and Holocene age that are composed of <br /> sediments similar to and probably conformable on underlying <br /> deposits of alluvium and Tulare formation. The flood-basin <br /> deposits are light-to dark brown and grey clay, silt sand and <br /> organic materials with locally high concentrations of salt and I <br /> alkali. Stream-channel deposits of sand and gravel are also <br /> included (Hotchkiss and Balding, 1971). <br /> This study focuses on the water duality in the "shallow water- <br /> bearing zone" of Hotchkiss and Balding ( 1971 ) . Groundwater <br /> within this zone occurs less than 10 feet below grade over most <br /> of the Tracy area. The flood-plain deposits of the shallow <br /> water-bearing zone have well developed soil profiles and, conse- <br /> quently, poor permeability. The base of the shallow zone is <br /> Poorly defined and probably is from 5 to 25 feet below Land <br /> surface. -! <br /> Based on monitoring data from nearby facilities, regional <br /> , groundwater flow in the shallow water-bearing zone beneath the <br /> Heinz plant is generally to the north. <br /> 3.0 FIELD INVESTIGATION <br /> 3.1 Purpose and Scope <br /> Waterwork drilled, logged, and sampled two additional soil bor- <br /> ings which were completed as groundwater monitoring wells pursu- <br /> ant to the workplan contained in the November 15, 1990 report. <br /> To define the lateral extent of soil and groundwater contamina- <br /> tion, these wells were situated with one well approximately <br /> upgradient and one approximately downgradient of the xormer tank <br /> location. The boring/well locations are shown on Figure 2. <br /> 3.2 Methods and Procedures <br /> On January 2, 1991, two eight-inch soil borings were drilled and <br /> completed as two inch diameter groundwater monitoring wells by <br /> Spectrum Exploration (C57 512268) using a hollow stem auger drill <br /> rig. All procedures and protocol for groundwater monitoring well � <br /> 3 <br />