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1 ' Coca-Cola Enterprises - West USTEC Job No 90054 03 Each of the six groundwater monitoring wells were measured for depth to groundwater and ' groundwater table elevations(referenced to mean sea level) on November 21, 1991 Groundwater measurements were collected and measured to the nearest 0 01 feet using a calibrated Marine ' Moisture Control® (MMC) electronic interface probe The electronic interface probe was decontaminated between measurements to reduce the possibility of potential cross- contamination The decontamination process consisted of an initial wash in Tn-Sodium Phosphate (TSP) and tapwater solution followed by two distilled water rinses ' 32 GROUNDWATER ELEVATION RESULTS ' Groundwater elevations were calculated using a wellhead survey conducted by Mid-Valley Engineering, Modesto, California The survey consisted of level circuits carried from a City of ' Stockton Datum Benchmark The accuracy of this survey was within 0 01 feet The results of the groundwater elevation measurements collected by USTEC personnel are presented in Table 3 A summary of historical groundwater elevations are presented in Table 4 The groundwater elevation decreased an average of 0 44 feet from August 22, 1991 to November 21, 1991 Groundwater elevations ranged from -53 50 in MW-3 to -54 29 in MW-6 A groundwater elevation contour map is presented on Figure 3 The groundwater flow is generally towards the northeast, and is consistent with previous monitoring results 4 0 GROUNDWATER SAMPLING PROCEDURES I The six groundwater monitoring wells were sampled by USTEC personnel on November 21, 1991 To minimize the risk of cross-contamination during the sampling program, work proceeded from the wells with the least contamination, as noted in the previous quarterly rmonitoring, to wells with increasingly contaminated water 1 , I 4 [ItiT I I I I