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1 ' 17 December 1997 • AGE-NC Project No 95-0144 Page 2 of 4 ' samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (TPH- d), and motor oil (TPH-mo) in accordance with EPA Method 8015 modified for each hydrocarbon range, for volatile aromatic compounds (benzene, toluene;ethylbenzene and xylenes, BTE&X) izi accordance with EPA Method 602, and for volatile organic compounds with oxygenated volatile organics in accordance with EPA Method 8260 3.0. FINDINGS 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT The relative elevation of ground water in each well was calculated by subtracting the depth to water ' from the surveyed casing elevation (Table 1) Ground water elevation decreased an average of 0 96 feet between August and November 1997 The approximate hydraulic gradient for the current monitoring period was calculated to be 0 0043 ft/ft with a northerly flow direction Ground water elevation contours derived from data collected on 04 November 1997 are depicted in Figure 3 Ground water was between two and five feet above the screened interval in monitoring wells MW-1, • MW-2, MW-4, MW-5 and MW-8 Ground water was within the screened interval for the remaining wells 32 ANALYTICAL RESULTS OF WATER SAMPLES 1 During the November 1997 monitoring, TPH-g was detected in well MW-13 at a concentration of 100 parts per billion (ppb, reported as micrograms per liter), TPH-d was detected in wells MW-1, MW-2, MW-4, MW-5, MW-13 and MW-18 at concentrations ranging from 60 ppb to 130 ppb TPH- ' mo was not detected in samples collected during the November 1997 monitoring event Xylenes were detected in the samples collected from MW-1 and MW-13 at concentrations of 0 8 ppb and 0 73 ppb, respectively BTE&X were not detected in the remaining samples collected Chloroform was detected in the samples collected from MW-2 and MW-5 at concentrations of 1 7 ppb and 1 5 ppb, respectively Sec-butyl benzene, isopropylbenzene and p-isopropyl toluene were detected in the sample from MW-13 at concentrations of 11 ppb, 4 1 ppb and 2 3 ppb, respectively Oxygenated volatile organic compounds were not detected in any ground water samples 1 Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report ' (MAI Laboratory I D Nos 82655-82663) and chain-of-custody forms are included in Appendix B • Advanced GcoEnvirojunenfal,inc R