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Rr z — s - - - — � r -, i�i � _.�,- , _ _ r e 1 „ g r _. a �-•r ' -,��+ 4 i 1 J 24 August 1998 , AGE-NC Protect No 96-0232 Page 6 of 8 oxygenates None of the analytes were detected In the soil samples Analytical results of soil samples are summarized In Table 2 The laboratory reports(Castle Analytical Laboratory Reference No 1655 „ and McCampbell Analytical Lab I D Nos 91745 to 91748) and chains-of-custody forms are Y included in Appendix D i 3 5 RESULTS OF GROUND WATER SAMPLE ANALYSIS A total of eight ground water samples were submitted to DTSC-certified laboratories for analysis ITPH-d was detected in ground water samples collected from wells MW-1, MW-2, MW-5, and MW- 6A at concentrations up to 140 parts per billion(ppb, reported as micrograms per liter), TPH-d was detected in the sample collected from well MW-6B at 280 ppb TPH-g was not detected in ground water samples collected from MW-1 through MW-7 Utilizing EPA Method 8020,BTEX were not detected in ground water samples collected from wells MW-1 through MW-7, however, MTBE was detected In samples collected from MW-1 through MW4, MW-6A and MW-7 at concentrations as high as 630 ppb Uilhzing EPA method 8260, MTBE was detected in samples collected from MW-1 through MW-4, MW-6A, MW-6B and MW-7 at concentrations up to 810 ppb Other fuel oxygenases were not detected above laboratory reporting limits Analytical results of the ground water samples are summarized in Table No 3 The laboratory report (McCampbell Analytical Lab I D No 91824 to 91830) and chain-of-custody forms are presented In Appendix E 4.0. SUMMARY AND CONCLUSIONS ' Based upon data collected during the June 1998 well installations and the July 1998 ground water, monitoring, AGE concludes , • Ground water was inferred to be flowing generally west northwest at a calculated gradient of 0 003 ft/ft, or approximately 14 feet per mile (Figure 3) Due to the low gradient at the _ ' site, slight variations In ground water measurements or changes of recharge/discharge of the local ground water could greatly modify ground water flow direction t • Laboratory analysis of ground water samples indicates the greatest concentrations of TPH-d I and MTBE are located near MW-1, MW-2 and MW-6 • Concentrations of/TPH-d were detected at concentrations ranging up to 140 ppb from / z Advanced GeoEnvironmental,Inc 7 P