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24 November 1997 <br /> AGE-NC Project No 97-0312 <br /> Page 2 of 4 <br /> preservative and one 1-liter amber bottle without preservative The samples were labeled, placed In <br /> a chilled container and transported to McCampbell Analytical, Inc (MAI) in Pacheco, California <br /> The samples were analyzed in accordance with EPA Method 5030 and 8015m for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d), In accordance with EPA Method <br /> 602/8020 for volatile aromatics hydrocarbons (benzene, toluene, ethylbenzene and xylenes, <br /> BTE&X) with methyl tertiary-butyl ether (MTBE) and In accordance with EPA Method 8260 for <br /> volatile organic compounds with oxygenated volatile organics <br /> 23 PURGE WATER DISPOSAL <br /> On 17 September 1997,purge water stored at the site was disposed In conjunction with ansate water <br /> related to the UST removals performed at the site Water was transported by Nor Cal Oil to <br /> Amerlclean, Inc in Silver Springs, Nevada A copy of the hazardous waste manifest is included In <br /> Appendix C <br /> 3 0. FINDINGS <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to water from <br /> the surveyed casing elevation (Table 1) The ground water elevation had decreased an average of <br /> 4 56 feet since the previous monitoring event In June 1997 The ground water flow direction was <br /> calculated to be N 38° E at a gradient of 0 00035 ft/ft near the UST location, the ground water flow <br /> direction varied to S 84° E at a gradient of 0 00035 ft/ft on the north end of the site The flow <br /> direction Is similar to previous monitoring events However, a shallower gradient was observed <br /> during the September 1997 monitoring Small normal measurement variations can produce large <br /> variations In flow direction at sites with low gradients Figure 3 - Ground Water Elevation depicts <br /> the contours for September 1997 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and TPH-d were detected in the sample collected from monitoring well UST-5 at a <br /> concentrations of 370 parts per billion (ppb, reported as micrograms per liter) and 160 ppb, <br /> respectively Benzene was detected in this sample at a concentration of 5 7 ppb MTBE was detected <br /> In UST-5 at a concentration of 11 ppb However,MTBE was not detected in UST-5 by method 8260 <br /> Other petroleum hydrocarbons were not detected in samples collected at the site <br /> Advanced GeoEnviron mental,Inc <br />