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Site Background Information <br /> ARROYO'S SMOG SHOP <br /> 3012 East Waterloo Road,Stockton, California <br /> The subject property,located at 3012 East Waterloo Road in an unincorporated portion San Joaquin <br /> County, California, is situated in an area of mixed commercial/residential and light industrial use. <br /> Historical site usage research performed by AGE has indicated that the property was utilized as a <br /> gasoline service station for approximately 40 years. <br /> REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> The site is situated within the southern portion of the Great Valley Geomorphic Province of <br /> California, a large, elongate, northwest trending, asymmetric structural trough. The northern and <br /> southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, <br /> respectively.The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and <br /> Cascade Range to the north, and the Sierra Nevada to the east. <br /> The Great Valley has been filled with sediments derived from both marine and continental sources. <br /> Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than <br /> 20,000 feet in the south central portion of the valley.The sedimentary formations range in age from <br /> Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits <br /> being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, <br /> fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the <br /> valley(Olmsted and Davis, 1961).The site itself is located on unconsolidated and semi-consolidated <br /> alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and <br /> Geology, 1977).Rocks composing the basement complex of the Province have not been completely <br /> defined but are believed to be metamorphic and igneous in origin.. <br /> j The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are.the <br />+ principal sources of domestic ground water in the 13;500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22). <br /> I <br /> The nearest surface water feature to the site is the Stockton Diverting Canal,located approximately <br /> 1,600 feet northeast of the site.Based upon ground water maps prepared by the San Joaquin County <br /> Flood Control and Water Conservation District and well information obtained from nearby sites, <br /> ground water flow direction is variable near the site.Depth to water is currently estimated to occur <br /> between 55 and 65 feet below surface grade (bsg). However, this may.vary greatly due to local <br /> recharge and discharge patterns. <br /> 1 <br /> SITE STRATIGRAPHY <br /> N <br />