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-;5 - <br /> a <br /> t <br /> A <br /> October 3, 1990 <br /> limited Subsurface Environmental lavestigation AGS 30055-1 <br /> ARCO Service Station No. 6020, Manteca, California <br /> P� <br /> SITE BACKGROUND AND ADJACENT PROPERTY <br /> ARCO Service Station No. 6020 is on the north.east cornier of 'Yosemite Avenue an <br /> Highway 99 in tvianteca, Calilornia, as shown on the 'Site Vicinity Map (Plate P-1). The <br /> property adjacent to the site at the intersection is commercial. <br /> lan <br /> The approximate locations of present site features are shown on the Generalized Site p <br /> (plate p-2). According to information supplied by ARCO. there is one 10,000 galion <br /> gasoline-storage tank and two 12,000-gallon gasoline-storage tanks(labeled T-1 through T-3. <br /> respectively, on Plate P-2) at the site. Tank T-1 stores super unleaded gasoline, tank T- <br /> and tank T-3 stores unleaded ,gasoline. <br /> stares leaded gasoline, <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> I fan deposits of the Great Valley and are of Recent <br /> The site area is underlain by alluvia <br /> ese sediments consist of un <br /> age. Thconsolidated clay, silt, and sand (Rogers. 1966). e <br /> topographic surface is nearly flat with a slight westward slope- Based on regional maps <br /> ter <br /> ® Flood Control and prepared from 1988 ground-water data by San Joaquin County lathe <br /> Conservation District. ground water near the site is approximately 25 below grade a <br /> 2 <br /> ,80,062d Geosystems <br />