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l t '16 April 2002 ` AGE-NC Project No 00-0769 Page 3 of 6 ' 3 2 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers Each ' water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid E as a sample preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratones(CTEL), '1 a California Department of Health Services-approved laboratory, for analysis The samples were analyzed for the following ' TPH-g in accordance with EPA Methods 8015M, • BTEX and,the oxygenated ether methyl tertiary-butyl ether(MTBE)in accordance with EPA ' Method SW846 8021, and • 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 Modified 1 , '4.0. FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 05 March 2002,the contaminant impact to ground water was quantified by the laboratory analytical data 4 1 GROUND WATER GRADIENT AND FLOW DIRECTION The relative elevation of ground water in each well was calculated by subtracting the depth to ground water from the surveyed well head elevations (Table 1) Depths to ground water during the first quarter, 2002 monitoring event ranged from 22 50 feet to 25 24 feet below the tops of the well casings Ground water elevations at the site ranged from-12 48 feet in MW-3A to-14 31 in MW-2A trelative to mean sea level (MSL) Monitoring data from MW-1 through MW-3B was combined with monitoring well data collected s tfrom the adjacent Arc Pump and Welding(1211 Turnpike Road)on 05 March 2002 to determine the approximate ground water flow direction The shape of the water table during the'March 2002 monitoring event was in the form of a southeast-plunging trough, ground water flow near the former UST No 1 and No 2 location was toward the southwest, ground water flow near the former UST No 3 location was toward the southeast The average gradient at the site was 0 002 feet/feet Figure ' 3 illustrates the contoured ground water elevations as measured on 05 March 2002 L Advanced GeoEnvironmental,Inc {