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2 . 5 Estimates of liquid quantity and composition leaked : <br /> No estimate of the liquid quantity leaked can be made with <br /> existing information . The constituents detected in the soil <br /> sample appear to be derived from diesel . <br /> 2 . 6 Topography, geology, surface water, depth to groundwater : <br /> The site is situated on level terrain underlain by flood <br /> basin deposits of Pleistocene and Holocene age that are <br /> composed of :sediments similar to and probably conformable on <br /> underlying deposits of alluvium and Tulare formation . The <br /> flood-basin deposits are light-to dark brown and grey clay, <br /> silt sand and organic materials with locally high <br /> concentrations of salt and alkali . Stream-channel deposits <br /> of sand and gravel are also included (Hotchkiss and Balding, <br /> 1971 ) . <br /> This study will investigate water quality in the "shallow <br /> water-bearing zone" of Hotchkiss and Balding ( 1971 ) . <br /> Groundwater within this zone occurs less than 10 feet below <br /> grade over most of the Tracy area . The flood-plain deposits <br /> of the shallow water-bearing zone have well developed soil <br /> profiles and, consequently, poor permeability. The base of <br /> the shallow zone is poorly defined and probably is from 5 to <br /> 25 feet below land surface . <br /> Based on monitoring data from a nearby facility, groundwater <br /> flow in the shallow water-bearing zone beneath the Heinz <br /> plant is probably to the north. <br /> 2 . 7 Proximity of private, municipal and irrigation wells : <br /> Well locations within a one-half mile radius have been <br /> requested from the Department of Water Resources (DWR) . <br /> 2 . 8 Proposed sampling locations and methodology: <br /> To assess the contribution of the former underground diesel <br /> storage tank at the Heinz facility to soil and groundwater <br /> contamination, WaterWork proposes to : 1 ) excavate all <br /> contaminated soil from the pit area and; 2 ) install one <br /> groundwater mon or nq we own gra en from the pit . <br /> workplan to conduct the investigation is presented below. 4-0 <br /> c�c,Lc. cHz <br /> 2 . 8 . 1 The former tank pit will be re-excavated to remove all <br /> contaminated soil above the water table . In addition, <br /> the excavation will be expanded laterally - as necessary <br /> - until all contaminated soil is removed . To assure that <br /> all contaminated material is removed, four sidewall soil �Ik / <br /> samples will be collected . Clean material will be P`K. <br /> backfilled into the pit . The samples will be analyzed <br /> for BTX/TPH as diesel . Composite samples will also be <br />