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Work Plan for Re-excavation May 3, 1989 { <br /> Former Texaco Service Station, Manteca, California AGS 38053-1 <br /> while the late Tertiary to Recent sediments consist primarily of <br /> continental deposits. Depositional and erosional sequences were <br /> primarily controlled by fluctuations in sea level. Fresh water <br /> and brackish water lakes formed in the valley resulting in the <br /> deposition of lacustrine clay over extensive areas. Higher <br /> energy environments, such as rivers and streams, resulted in the <br /> deposition of channel sand and gravel. <br /> The site is underlain by very gently dipping Quaternary fluvial <br /> :sediments consisting of sand, silt, and clay. The topographic <br /> surface in the area is slightly irregular with a generally <br /> downward northwestward slope. The nearest surface stream is Lone <br /> Tree Creek located approximately 4 miles north of the site. <br /> Wastewater ponds owned and operated by Spreckles Sugar are <br /> located approximately 0.5-mile south of the site. <br /> PROPOSED WORK <br /> The tasks described below are proposed to evaluate subjective <br /> evidence of hydrocarbon contamination in the soil and remove soil <br /> canto drocarbons from beneath the locations of the <br /> former underground storage tanks and possibly the underground <br /> product-delivery_ lines. <br /> �. 7 <br /> i41�1�d%e� Coe®Syst�rll� <br />