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TABLE 3 <br /> RELATIVE GROUNDWATER ELEVATIONS* <br /> Hess-Dubois Cleaners <br /> 348 West Harding Way, Stockton, California <br /> Well 1. D. MW-1 MW-2 Mw-3 diza <br /> ' 10.63 10.04 Calculated <br /> Casing Elev. 10.00 Gradient <br /> Date DTW RGE DTW RGE DTW RGE <br /> ' 11-4-93 43.95 -33.95 44.00 -33.37 42.41 -32.37 0.057 ft/ft <br /> i-18-94 42.70 -32.70 42.82 -32.19 42.84 -32.80 0.016 ft/ft 2-22-94 42.10 -32.10 42.17 -31.5442.22 -32.18 0.020 ftlft <br /> 5-24-94 40.89 -30.89 41.01 -30.38 41.68 -31.64 0.043 ft/ft N S° E <br /> ' <br /> 6-22-94 <br /> 41.25 -31.25 41.32 -30.69 41.39 -31.35 0.019 fft/ftN 140 W <br /> 7-26-94 42.03 -32.03 42.09 -31.46 42.22 -32.1$ 0.020 ft/ft N 10° W <br /> m]effiLVCtPemLS lm 0e[ <br /> DTW-Depth to Gro"dwater.RGE Relative C,toundwater 10eva,iom <br /> (summer) <br /> decreases in groundwater depth in the area. <br /> In June, the gradient was calculated to be 0.019 ft/ft directed N 140 W (Figure 3); in July, <br /> the gradient was calculated to be 0.020 directed N 100 W (Figure 4). The gradients and flow <br /> directions for June and July are consistent with previous calculations. <br /> 4.2 Petroleum Hydrocarbon Impacted Groundwater <br /> TPH as stoddard solvent was detected in MW-1, MW-2 and <br /> Mmes t endentrati insof MW-00 <br /> ppb, 670 ppb and 2,800 ppb, respectively. Ethylbenzene xylenes <br /> at concentrations of 17 ppb and 1.5 ppb, respectively. No <br /> sampnzene or toluene were les a summarized in Table4.oundwater sam <br /> in any samples. Analytical results of g P <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 140 <br /> W;the gradient has averaged approximately 0.024 ft/ft.Both these calculations are consistent <br /> with regional and local trends. <br /> 1 <br />