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� T. AT <br /> 1 <br /> A 5 5 0 C I A T E 5 I N C <br /> The site is in the Eastern San Joaquin County Groundwater 13asui (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 flow is to <br /> 1 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 stock 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 Lake) <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 Hvdroi eologv <br /> Based on information obtained from previous bongs 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 5 feet Geologic cross sections depicting the interpreted <br /> subsurface conditions are included on Figures 3 and 4 and in Appendix A <br /> 1 During on-site drilling activities, groundwater was encountered atroxi mate[ <br /> app y 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 /> 1 <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 /> W 162574 011CAP report doc 3 <br />