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1 TABLE <br /> J RELATIVE GROUNDWATER ELEVATIONS` <br /> Hess-Dubois Cleaners <br /> 348 West Harding Way, Stockton, California <br /> Well I. D. MW-1 h18Y-2 AiW-3 Calculated <br /> ' Casing Elev. 10.00 10.63 10.04 Calculated now <br /> Gradient Direction <br /> Date DTW RGE DTW ltGE DTV RGE <br /> 11-4-93 43.95 -33.95 44.00 -33.37 42.41 -32.37 0.057 ft/ft Southerly <br /> 1-18-94 42.70 -32.70 42.82 -32.19 42.84 -32.80 0.016 ft/ft N 121 W <br /> 2-22-94 42.10 -32.10 42.17 -31.54 42.22 -32.18 0.020 ft/ft N 1.1°W <br /> 5-24-94 40.89 -30.89 41.01 -30.38 41.68 -31.64 0.043 ft/ft N 5nE <br /> ' 6-22-94 41.25 -31.25 41.32 -30.69 41.39 -31.35 0.019 ft/ft N 148 W <br /> 7-26-94 42.03 -32.03 42.09 -31.46 4222 -32.18 0.020 ft/ft N I(PW <br /> 8-31-94 42.80 -32.80 42.90 -32.27 42.77 -32.73 0.011 ft/ft N 31°W <br /> 9-27-94 43.09 -33.09 43.20 -32.57 43.00 -32.96 0.009 ft/ft N 432W <br /> 10-28-94 42.83 -32.83 42.99 -32.36 42.98 -32.94 0.015 ft/ft N 130W <br /> `t 12-28-.94_ 42.06 -32.06 42.17 -31.54 42.37 -32.33 0.011 ft/ft N 3°w <br /> 'All measurements in feet <br /> DTW= Depth to Groundwater,RGE = Relative Groundwater Elevation <br /> 4.2 Petroleum Hydrocarbon Impacted Groundwater <br /> ' TPH as stoddard solvent was detected in MWA, 111W-2, and MW-3 at concentrations of 180 <br /> ppb, 740 ppb and 1,900 ppb, respectively. No benzene, toluene, ethylbenzene, or Xylenes <br /> were detected in any of the samples. Analytical results of groundwater samples- are <br /> ' summarized in Table 4. The laboratory report and chain-of-custody are included in <br /> Appendix B. <br /> ' 5.0 CONCLUSIONS & RECOMMENDATIONS <br /> 5.1 Groundwater Flow Direction and Gradient <br /> Since January 1994, the groundwater flow direction has remained between N 5 ° E and N <br /> 43,,W;groundwater gradient has averaged approximately 0.022 ft/ft. Measurements collected <br /> ' in December 1994 are consistent with previous monitoring events at the site. <br />' ' (Seobg:�l Audi3erv:cs+.Ive. ' <br /> tt_DuBa:QR447-2e.9e073 8 <br /> 1 <br />