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02 October 2000 <br /> AGE-NC Project No 98-0465 <br /> Page 6 of 9 <br /> specifications for murucipal wells near the site A database from the California Department of Water <br /> Resources (DWR), driller's well log files and a well location map prepared by the San Joaquin <br /> County Flood Control and Water Conservation District (SJCFC&WCD) were examined to locate <br /> wells near the site A 2,000-foot search radius from the site was used Owners/residents of nearby <br /> properties of the site were contacted regarding wells near the site <br /> 4.0. FINDINGS <br /> ' Ground water flow direction was determined during the sampling event and gradient was inferred <br /> from data collected in the field, ground water levels were above the screen interval of the wells on <br /> ' the site, the hydrocarbon impact to ground water was quantified by the laboratory data obtained from <br /> the ground water samples <br /> 41 STRATIGRAPHY <br /> In general brown, damp to moist silty clay was encountered at approximately 5 feet and 20 feet bsg <br /> At 10 feet bsg the hthology was brown, moist, silt with fine sand A brown saturated silty fine sand <br /> was encountered at 15 feet bsg Poorly graded sand with silt was encountered at 25 feet bsg The <br /> boring logs are included as Appendix A A line of cross-section is illustrated on Figure 4 A <br /> stratigraphic cross section is depicted in Figure 5 <br /> ' Organic vapor was not detected in MW1 through MW4 PID data is included on the boring logs <br /> (Appendix A) <br /> 4 2 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br /> ' For the July 2000 sampling event, depths to ground water ranged from 9 72 feet to 10 73 feet below <br /> the tops of the well casings Ground water elevations at the site ranged from 6 98 feet below mean <br /> ' sea level (MSL) in well MW4 to 7 06 feet in well MW1 The ground water in wells MW1 through <br /> MW4 occurs within the screened interval <br /> ' The ground water flow direction was calculated using ground water elevation data The ground water <br /> at the site was inferred to be flowing to the north-northwest under an average gradient of 0 0013 <br /> Figure 3 illustrates the contoured ground water elevations as measured on 18 July 2000 <br /> Advanced GeoEnvironmental,[ne <br />