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Work Plan for Environmental Investigation May 18 , 1989 <br /> Proposed ARCO Station Woodbridge, California AGS 39044-1W <br /> it <br /> SITE GEOLOGY AND HYDROGEOLOGY <br /> r• The site is underlain by the Modesto Formation, which is composed <br /> of alluvial sediments that are arkosic in composition and that <br /> range in size from gravel to sand and silt (Marchand and <br /> Allwardt, 1977) . The Modesto Formation dips gently to the west <br /> (California Division of Mines and Geology, 1966) . - <br /> The site is located in the Eastern San Joaquin County Ground- <br /> Water Basin, which has a regional ground-water gradient -to the <br /> southwest (California Department of Water Resources, 1980) . The <br /> ground-water basin has been developed for intensive irrigation, <br /> domestic, industrial, municipal, and stock use. <br /> te. The local surface drainage includes the Mokelumne River and the <br /> South Main Canal. The Mokelumne River drains to the west <br /> approximately 1/2-mile north of the City of Woodbridge.- '-"The". - <br /> South Main Canal flows to the southwest and originates <br /> approximately 300 feet south of the site. Depth to ground water <br /> is inferred to be less than 15 feet below grade based on - <br /> information supplied during the geotechnical investigation by <br /> ARCO. - <br /> 3 <br /> Apv/ied Ge0sFSZO)ns - <br />