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1 15 October 2001 . AGE-NC Project No 96-0232 Page 10 of 17 ' Inferred toward the west at an approximate gradient of 0 001 ft/ft or less (Figure 5) Ground water flow direction in the Primary Aquifer Zone (130 to 150 feet bsg) in the area of Flag ' City Chevron monitoring wells MW-8C, MW-9C, MW-10E, MW-11D, MW-12D and MW-13D was variable and generally oriented toward the area of the Rocky's Restaurant domestic drinking water well (RDW-1) at an approximate gradient of 0 001 ft/ft or less (Figure 6) 3 4 2 Laboratory Results Of Ground Water Samples ' During the September 2001 sampling event, TPH-g was detected in a water sample collected from MW-13A at a concentration of260,ug/l, TPH-d was detected in samples collected from MW-12A, ' MW-13A and MW-13C at concentrations as high as 530 Aig/1, and TPH-mo was detected in a water sample collected from MW-12A at a concentration of 400 ,ug/l The laboratory indicated that the I sample chromatograms from MW-12A, MW-13A and MW-13C contained significant diesel range compounds,the laboratory indicated the sample chromatogram from MW-12A contained significant oil range compounds iBenzene was detected in a water sample collected from well MW-13A at a concentration of 70�Zgd, toluene, ethylbenzene and xylenes were detected in water samples collected from wells MW 12A, MW-12B and MW-13A at concentrations as high as 6 8 ,ug/l No other BTEX compounds were detected in any of the samples collected during September 2001 MTBE (utilizing EPA Method 8020)was detected in water samples collected from wells MW-7,MW-11B,MW-13A,EW-4,EW- 5, EW-6 and EW-9 at concentrations as high as 130/tg/1 MW-11B) MTBE(utilizing EPA Method 8260)was detected in water samples collected from monitoring wells MW-1,MW-7, MW-9A, MW-9C,MW-I IA,MW-1113 and MW-13A at concentrations as high as 1304gll (MW-11B), isoconcentration maps displaying the estimated extent of dissolved MTBE in First Zone and Second Zone aquifer are depicted in Figures 7 and 8 MTBE was detected in water samples collected from extraction wells EW-2, EW-4, EW-5, EW-6, EW-8 and EW-9 at concentrations as high as 35,ug/1 (EW--5), an isoconcentration map displaying the estimated extent of dissolved MTBE in the area of the ground water extraction wells is depicted in Figure 9 No other constituents of concern were detected above laboratory reporting limits in the water samples collected during the third quarter 2001 sampling event Site investigation and the current third quarter 2001 analytical results of ground water monitoring well samples are summarized in Tables 5 and 6 The laboratory reports(McCampbell Analytical Inc i D Nos 77236 through 77250, 77330 through 77338 and 77344 through 77364) and chain-of-custody forms are presented in Appendix H IAdvanced GeoEnvsronmental,Inc I