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�l 14 TABLE 3 RELATIVE GROUNDWATER ELEVATIONS' Hess-Dubois Cleaners F 348 West Harding Way, Stockton, California i Well L D. MW-1 MW-2 MW-3 Calculated Casing Elev. 10.00 10.63 10.04 Calculated Flow Date DTW RGE DTW RGE DTW RGE Gradient Direction 11-4-93 43.95 -3395 44.00 -33.37 42.41 -32.37 0.057 ft/ft Southerly 1-18-94 42.70 -32.70 42.82 -32.19 42.84 -32.80 0.016 ft/ft N12°W ' 2-22-94 42.10 -32.10 42.17 -3154 42.22 -32.18 0.020 ft/ft N 14°W 5-24-94 40.89 -30.89 41.01 -30.38 41.68 -3I.64' 0.043 ft/ft N_9E ' 6-22-94 41.25 -31.25 41.32 -30.69 41.39 -31.35 0.019 ft/ft N140W 7-26-94 42.03 -32.03 42.09 -31.46 42.22 -32.18 0.020 ft/ft N100W ' 8-31-94 42.80 -32.80 42.90 -32.27 42.77 -32.73 0.011 ft/ft N31wW 9-27-94 43.09 -33.09 43.20 -3257 43.00 -32.96 0.009 ft/ft N43°W ' 10-28-94 42.83 -32.83 1 42.99 -32.36 42.98 -32.94 0.015 ft/ft N130W •All measurements in feet DTW=Depth to Groundwater.RGE= Relative Groundwater Elevation M groundwater from August 1994 to September 1994 to October 1994. This fluctuation is consistent with seasonal (summer to fall) changes in groundwater depth in the area. ' The groundwater gradient and flow direction in August, September and October was calculated to be 0.011 ft/ft directed N 310 W (Figure 3), 0.009 ft/ft directed N 430 W (Figure 4) and 0,015 ft/ft directed N 130 W (Figure 5), respectively. The gradients and flow directions for these three months are consistent with previous calculations. 4.2 Petroleum Hydrocarbon Impacted Groundwater ' TPH as stoddard solvent was detected in MW-1, MW-2, and MW-3 at concentrations of 160 ppb, 600 ppb and 880 ppb, respectively. Benzene, Ethylbenzene, and Total Xylenes were detected in MW-3 at concentrations of 1.2 ppb, 15 ppb, and 2.4 ppb, respectively. Toluene was not detected in any of the samples. Analytical results of groundwater samples are summarized in Table 4. The laboratory report and chain-of-custody are included in Appendix B. 0e.6001 A.&s.Nie 1... xw.n.a i.QRMO.K 3 7