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-, subsurface Er�ironmental Investigation September 21, 1989 <br /> i Abandoned I.P;ner Service Station, Lodi, California AGS 38055-1 <br /> concentrations. The dimensions of the excavated tank pit are <br /> approximately 12 feet by 13 feet by 27 feet. The excavation has Cf <br /> sinca been backfilled by others to an approximate depth of 12 <br /> feet; compaction requirements and observation services during <br /> backfilling (if any) were also provided by others. -' <br /> GEOLOGY - <br /> 410 <br /> EOLOGY - <br /> The service station is located in the Central Valley geomorphic <br /> province of California. Areas adjacent to the site are flat with <br /> little topographic relief. The area is underlain by a thick <br /> - <br /> sequence of coritinantal and, marine sediments ranging in age from <br /> Recent to pre-Cretaceous (California Department of Water <br /> Resources, 1967) . Most of the pre-Cretaceous to mid--Tertiary <br /> sediments in this portion of the valley are of marine origin, <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 and <br /> brackish water lakes that formed in the valley resulted in <br /> deposition of lacustrine , lay over extensive areas. higher <br /> f energy environments, such'.as rivers and streams, resulted in the <br /> }, deposition of channel sand and gravel. <br /> 3 <br /> Geosystems <br />