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i 20 October 1997 AGE-NC Project No. 95-0109 Page 2 of 5 of 18% hydrochloric acid as a preservative. The samples were stored and transported in a chilled container to McCampbell Analytical, Inc. (MAI), in Pacheco, California, under chain-of-custody. All samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA method 5030/8015m, for volatile organic compounds (benzene, toluene, ethylbenzene and xylenes; BTE&X) in accordance with EPA method 602, and for volatile organics with oxygenated compounds in accordance with EPA method 8260. Samples were also collected from MW-9 and MW-14 and placed in 40-m1 VOA vials with no added preservative. These two samples were placed in a chilled container and transported under chain-of- custody to A. Keith Kaufman, M.S., in Culver City, California. These samples were analyzed for physicochemical properties and microbiological enumeration. 2.3. PURGE WATER AND SOIL DISPOSAL On 28 August 1997, water samples were collected from purge water stored in 55-gallon drums on- site. Samples were collected using a disposable plastic bailer. Immediately upon retrieval, the samples were transferred into 40-m1 EPA-approved VOA vials containing 0.5 ml of 18% hydrochloric acid as a preservative. The samples were stored and transported in a chilled container to MAI under chain-of-custody. The two samples were composited and analyzed for TPH-g and BTE&X in accordance with EPA methods 8015m and 602. Purge water is stored in a fenced enclosure at the site and normally allowed to evaporate for disposal. On 10 September 1997, 37 drums of soil were transported to Forward Landfill for disposal. The soil was generated during the installation of borings P3 through P16. The shipping manifest and soil disposal receipt from Forward are included in Appendix E. 3.0. FINDINGS 3.1. GROUND WATER GRADIENT AND DIRECTION The depth to ground water ranged from 56.3 feet below surface grade (bsg) north of the site to 58.5 feet bsg south of the site. The data indicates an average of 1.53 feet decrease of ground water elevation since June 1997. Ground water elevations are summarized on Table 1. Ground water elevation contours,based upon data collected on 16 September 1997, are depicted in Figure 3. The flow direction is toward the south and, as in previous monitoring events, the gradient steepens toward the south end of the site. Advanced CcoEnvironmental,Inc.