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Work Plan March 5, 1990 <br /> Proposed Unocal Station, Stockton, California AGS 30010-1W <br /> REGIONAL GEOLOGY AND HYDROGEOLOGY <br /> The site is underlain by the Lower Modesto Formation, which is composed of alluvial <br /> sediments that range in size from gravel to silt (Marchand and Allwardt, 1977). The <br /> Modesto Formation dips gently to the west (California Division of Mines and Geology, <br /> 1966). <br /> The site is in the northeastern San Joaquin County Ground-Water Basin (California <br /> Department of Water Resources, 1980). According to the San Joaquin Public Health <br /> Service (SJPHS), the regional groundwater gradient flows is to the southwest. The local <br /> ground-water gradient may be influenced, however, by pumping of nearby irrigation, <br /> domestic, and municipal wells. According to the SJPHS, data obtained from measuring <br /> ground-water levels in local wells in the spring of 1989 indicate that ground water in the <br /> area is approximately 50 to 60 feet below grade. <br /> The site is approximately 1/2 mile north of the Calaveras River (Plate P-1). The <br /> Mokelumne Aqueduct runs parallel to March Lane on the north side of the street. Tile <br /> aqueduct is owned by East Bay Municipal Utility District (EBMUD). We understand from <br /> EBMUD that there are three separate steel pipes within the aqueduct; one is coated with <br /> tar and two are coated with mortar. <br /> 4 <br /> Applied GeoSysteflys <br />