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ASS 0 C I ATE S I `N C . <br /> The site is in the Eastern San Joaquin County Groundwater Basin (California department of Water <br /> Resources, 1980). According to personnel of the San Joaquin County Public'Works Department and <br /> the City of Stockton Municipal Utilities Department, the direction of regional groundwater flaw is to <br /> the east-southeast and the depth to groundwater ranges from approximately 40 to 42 feet below <br /> surface grade ;(bsg). The groundwater basin has been developed for intensive irrigation, domestic, <br /> industrial, municipal,and stuck use. <br /> There are two surface streams near the site: Mormon Slough approximately 500 feet to the southwest <br /> and the eastward extension of the Stockton Deep Water Channel (including MacLeod Dake) <br /> approximately 2,000 feet to the north-northwest. Both bodies of water empty into the San Joaquin <br /> River approximately 2 miles downstream from the site. <br /> 2.3 Site Geology and;Hydro eco <br /> Based on information obtained from previous borings at the site, sediments underlying the site consist <br /> primarily of silt from ground surface to approximately 12 to 20 feet bsg. From 12 to 20 feet to <br /> approximately 30 feet bsg, the sediments consist predominantly of sand and silty sand, with silt lenses <br /> varying in thickness from approximately 2,to S feet. Geologic crass sections depicting the interpreted <br /> subsurface conditions are included on Figures 3 and 4 and in Appendix A <br /> During on-site drilling activities, groundwater was encountered at approximately 37 feet bsg From <br /> December 1988 to December 1999, static water levels have fluctuated from approximately 19 to 45 <br /> feet bsg variations in depth to water between the wells during each monitoring event are apparently <br /> due to seasonal fluctuations and possible hydraulic influence caused by the Stockton Deep Water <br /> Channel which is located approximately 2,000 feet to the north-northwest. <br /> Based on groundwater elevations measured on December 14 1999, the direction of groundwater flow <br /> is generally toward the east-northeast at an approximate gradient of 0.002 ft/ft. The direction of <br /> groundwater flow has ranged from southeast to northeast since groundwater monitoring was initiated <br /> in December 1988. <br /> WA62574.01\C P mFon aoc 3 <br />