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a <br /> i <br /> MM <br /> F <br /> On April 11 and 12, 1990, Banks & Company removed the product lines and USTs under the <br /> supervision of WaterWork. During the removal, moderate product odor was noted near the tank <br /> pit. Staining was noted near the fill end of Tank 3 (the diesel fuel tank)and in the product line <br /> { <br /> trenches. A product sheen was a:so noted in the groundwater visible in the bottom of tank pit <br /> 3.0 HYDROLOGY/GEOLOGY <br /> The site is located on level terrtun underlain by flood plain deposits of Pleistocene and Holocene <br /> age that are composed of sediments similar to and probably conformable on underlying deposits <br /> of alluvium and Tulare formation. The flood plain deposits are light to dark bravn and grey <br /> clay,silty sand,and organic materials with locally high concentrations of salt and alkali. Stream <br /> channel deposits of sand and gravel are also included (Hotchkiss and Balding, 1971). <br /> ,a <br /> The study focuses on the water quality in the shallow waterbearing zone identified by Hotchkiss <br /> ;F and Balding {1971). i�roundwat°,r within this zone occurs less than ten feet below grade over <br /> most of the Tracy area. General,groundwater gradient is to the north. The flood plain deposits <br /> of the shallow water bearing zone have well developed soil profiles and consequently poor <br /> permeability. -The base of the shallow zone is j+oorly defined and probably is from five to <br /> twenty feet below ground surface. The quality of the shallow groundwater in the Tracy area is <br /> - of generally poor qualir. <br /> - A record search of molls located withirt a one-half mile radi rs of the facility is being conducted <br /> at the office of the Department of Water Resources(DWR). Locations and available information <br /> - on record with DWR will be included in the problem assessment report to be completed pursuant <br /> to this plan. <br /> 4.0 MVESTIGrkTIVE PROCEDURES <br /> After the removal of the USTs, WaterWork collected a total of eleven soil samples. One sample {� . <br /> t <br /> — -- ------ --- ---- - — -- - - -- ---- ----- ------ — --- <br /> — was collected frofn'the side wall at each end of thettrec tanks located tri lank pit one(TP1). <br /> r One sample was collected from the bc:lom of the waste oil tank pit (TP2), and four samples jl <br />