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I I • 26 February 1996 ' AGE-NC Project No 95-0125 Page 4 of 6 ' 3 5 SOIL STOCKPILE AND PURGE WATER SAMPLING Stockpiled soil was sampled by representatives of AGE on 5 January 1996 Four samples were I collected from the stockpiled soil Each sample was collected using a metric soil sampler loaded with two clean, 2-inch by 3-inch brass sleeves After collection, both ends of the leading sleeve were ' covered with Teflon sheets, capped and sealed with tape The samples were placed in a chilled container and transported under chain-of-custody to ' McCampbell Analytical, Inc (MAI) in Pacheco, California Each sample was analyzed for TPH-g, and BTE&X in accordance with EPA methods 5030/8015 and 8020 One sample was also analyzed for total lead in accordance with EPA method 6010 IOn 5 January 1996, samples were collected from containenzed purged water stored on-site Samples were retrieved from the drums using new disposable plastic bailers Four samples were collected in 40-m1 VOA vials After collection, the samples were placed in a chilled container and transported under chain-of-custody to MAI Samples were analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m and 602, respectively 4.0. FINDINGS 4 1 GROUND WATER ELEVATION AND GRADIENT DIRECTION IWhen measured on 19 October 1995, the depth to ground water at the site ranged from 6 to 8 feet bsg The relative elevation of ground water in each well was calculated by subtracting the ground ' water depth from the surveyed casing elevations, casing elevations were surveyed relative to N W-1, which was assigned an arbitrary elevation of 100 00 feet Table 1 includes the ground water elevations The relative ground water elevation rose approximately 1 foot between the June 1995 and the October 1995 monitoring events Figure 3 illustrates the relative ground water elevations at the site, based upon data collected during I the October 1995 monitoring event Ground water flow in the area is toward the north, with a small ridge evident from MW-2 and MW-5 The overall northward trending flow is consistent with the regional ground water flow in the area 42 ANALYTICAL RESULTS OF GROUND WATER SAMPLES I . TPH-g was detected in MW-2 and MW-6 at concentrations of 340 and 950 ,ug/1 (micrograms per liter, equivalent to parts per billion ppb), respectively BTE&X were detected in MW-2 and MW-6 at concentrations up to 100 ppb (ethylbenzene, MW-6) Analytical results of ground water samples