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UST, groundwater flow is to the northeast. The cause of the flexure is uncertain, but may <br /> be influenced by local agricultural or domestic well pumping. <br /> 4.3 Groundwater Sample Results <br /> TPH as gasoline, benzene and toluene were detected in the water sample from monitoring <br /> well MW-1 at concentrations of 170 ppb, 6.8 ppb and 0.67 ppb, respectively. Benzene and <br /> toluene were detected in MW-4, at a concentrations of 1.7 ppb and 1.3 ppb, respectively. <br /> TABLE 2 <br /> ANALYTICAL RESULTS OF WATER SAMPLES <br /> Western Lift <br /> 3430 S. EI Dorado Street, Stockton, CA <br /> Sample Date TPH as TPH as Ethyl- <br /> Location Sampled Gas Diesel Benzene Toluene benzene Xylene <br /> MW-1 6-4-92 260 310 ND ND ND ND <br /> 11-24-92 220 ND 15 0.30 ND ND <br /> 6-21-93 99 ND 9.9 ND ND ND <br /> 10-8-93 120 ND 8.9 0.36 ND 0.68 <br /> ' 2-9-94 140 ND 7.0 NDND ND <br /> ND <br /> 5-31-94 100 58 5.5 ND N <br /> 9-14-94 170 ND 6.8 0.67 ND ND <br /> MW-2 11-24-92 ND <br /> ND ND ND ND ND <br /> 6-21-93 ND ND ND ND ND ND <br /> MW-3 11-24-92t ND 140 ND ND ND ND <br /> 1-22-93* NA ND NA NA NA NA <br /> 6-21-93 ND ND ND ND ND ND <br /> MW-4 6-21-93 ND ND 0.9 ND ND ND <br /> 1 10-8-93 ND ND 1.2 0.30 ND ND <br /> 2-9-94 ND ND 1.7 ND ND ND <br /> 5-31-94 ND ND 0.82 ND ND ND <br /> 9-14-94 ND ND 1.7 1.3 ND ND <br /> MW-5 6-21-93 ND ND ND ND ND ND <br /> 10-8-93 ND ND ND ND ND ND <br /> ' 2-9-94 ND ND ND ND ND ND <br /> 5-31-94 ND ND ND 0.62 ND ND <br /> 9-14-94 ND ND ND 3.8 ND ND <br /> µ91j, = parts per billion(ppbk t= Result due to laboratory error, '= Replacement sample <br /> NA = Not Analyzed: ND — None Detected <br /> <k 1. cal A.IW Se.viau.tae. 8 <br /> Wpsn tih QRSft49/dl.l9 <br />