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i <br /> February 14, 1992 JFZNMA <br />.• ARCO Service Station No 2130, Stockton, California <br /> r <br /> SITE BACKGROUND <br /> ARCO Service Station No 2130 is located at 7906 North El Dorado Street in Stockton, <br /> California, as shown on the Site Vicinity Map (Plate 1) According to information supplied <br /> by ARCO, there are four underground storage tanks presently at the site Two 4,000-gallon <br /> tanks and one 6,000-gallon tank store unleaded gasoline, and one 10,000-gallon tank stores <br /> super unleaded gasoline The approximate locations of the tanks and present site features <br /> are shown on the Generalized Site Plan (Plate 2) <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The site area is underlain by the Lower Member of the Modesto Formation, which is of <br /> Pleistocene age Sediments of this formation consist of unconsolidated clay, silt, and sand <br /> . (Wagner, et al , 1987) <br /> The site is in the Eastern San Joaquin County Ground-Water Basin (California Department <br /> of Water Resources, 1980) According to this reference, the ground-water basin has been <br /> developed for intensive irrigation, domestic, industrial, municipal, and stock use Based on <br /> regional maps prepared from 1988 ground-water data by San Joaquin County Flood Control <br /> and Water Conservation District, the regional direction of ground-water flow is to the <br /> southwest <br /> PROXIMITY OF WELLS AND UTILITIES <br /> It is our understanding. from City of Stockton personnel that the city of Stockton provides <br /> water and sanitary sewer for the site Based on our search of utility records at the <br /> Department of Public Works, City of Stockton, water and sewer lines are located within 50 <br /> feet of the western property boundary of the site No septic tanks or leachfields are located <br /> • 30003-4W 2 <br />