Laserfiche WebLink
07 June 2000 <br /> • AGE-NC Project No 99-0657 <br /> Page 4of7 <br /> I2 8 RECEPTOR WELL SURVEY <br /> A survey was performed to identify potential receptor wells near the subject property The City of <br /> Lodi was contacted for the location and construction specifications for municipal wells near the site <br /> A database from the California Department of Water Resources (DWR) and a well location map <br /> prepared by the San Joaquin County Flood Control and Water Conservation Distract(SJCFC&WCD) <br /> were examined to locate wells near the site A 2,000 foot search radius from the site was used <br /> Owners/residents of nearby properties of the site were contacted regarding wells near the site <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were mferred from data collected in the field, ground water <br /> levels were within the screen interval of the wells on the site, the hydrocarbon impact to ground <br /> water was quantified by the laboratory data obtained from the ground water samples <br />'• 3 1 STRATIGRAPHY <br /> Pea gravel was encountered at 5 feet bsg in MW 1 and MW2 and at 10 feet bsg in MW1 Sandy silt <br />' was encountered at 5 feet bsg in MW3 and MW4, and at 10 feet bsg in MW2, with silty sand to silt <br /> in MW3 and MW4 Silt and clay were encountered at 15 feet bsg and 30 feet bsg <br /> Silty sand was encountered at 25 feet, 35 feet, and 50 feet bsg Soil composition varied from silty <br /> sand, poorly graded sand to sandy silt at 20 feet, 40 feet, and 45 feet bsg A line of cross section is <br /> illustrated on Figure 4 and a stratigraphic cross section is depicted on Figures 5 <br /> I <br /> Organic vapor was detected in MW1 through MW4 at concentrations as high as 160 ppm (MW1 at <br />' 25 feet bsg) PID data is included on the boring logs (Appendix A) <br />' 3 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 /> At the time of the March 2000 sampling event, depths to ground water ranged from 34 48 feet to <br /> 35 39 feet below the tops of the well casings Ground water elevations at the site ranged from 6 70 <br /> . feet above mean sea level (MSL) in well MW4 to 7 26 feet above MSL in well MW2 <br /> Advanced GcoEnNironmental,Inc <br />