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1 Working To Restore Nature <br /> 2.1 Underground Storage Tanks <br /> ' According to information supplied by the Department of Public Works, the following USTs were <br /> removed from the site on the given dates, and the excavations backfilled. <br /> T-1 550-gallon Diesel Removed 10/28/93 <br /> ' T-2 1,000-gallon Regular Unleaded Removed 10/28/93 <br /> T-3 1,000-gallon Unleaded Removed 04/01/87 <br /> ' T-4 350-gallon Waste Oil Removed 04/23/92 <br /> T-5 550-gallon Diesel Removed 10/28/93 <br /> ' T-6 1,000-gallon Gasohine/Water Removed 08/07/87 <br /> According to the information given to RESNA, no USTs remain at the site. <br /> 1 <br /> i2.2 Regional Geolo and Hydrogeology <br /> The site is underlain by the Modesto Formation, which is divided into nonmanne basin deposits, <br /> fan deposits, and stream channel deposits consisting of clay, silt, and sand (Rogers, 1966). <br /> Basin deposits are dominant at this site. The Modesto Formation dips gently to the west <br /> ' (Wagner, et al , 1981). <br /> The site is in the Eastern San Joaquin County Groundwater Basin (California Department of <br /> Water Resources, 1980). According to personnel of the San Joaquin County Public Works <br /> Department and the City of Stockton Municipal Utilities Department, the direction of regional <br /> ' groundwater flow is to the east-southeast and the depth to groundwater ranges from <br /> approximately 40 to 42 feet below surface grade (bsg) The groundwater basin has been <br /> developed for intensive irrigation, domestic, industrial, municipal, and stock use. <br /> 1 <br /> 1 <br /> 38009-838009-8 FRP 3 <br />