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5 _ V <br /> ' V <br /> 10 February 2000 ` <br /> • AGE-NC Project No 98-0426 <br /> I , ± Page 2 of 3 _ <br /> a <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) In accordance with EPA <br />' Methods 5030, <br /> • Volatile aromatic compounds benzene, toluene, ethylbenzene and xylenes (BTEX) in <br />' accordance with EPA Method 8260B, and <br /> • Volatile organic compounds and fuel oxygenates methyl tertiary-butyl ether (MTBE) di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether <br /> (TAME), and tertiary butanol (TBA) In accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were Inferred from data collected In the field, the impact <br /> to ground water resulting from the unauthorized release of fuel hydrocarbons was quantified by the <br /> laboratory data obtained from the ground water samples <br /> . 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water In each well was calculated by subtracting the depth to ground <br /> water from the surveyed relative casing elevations (Table 1) Depths to ground water ranged from <br /> 22 49 feet to 23 58 feet below the tops of the well casings Relative ground water elevations at the <br /> site ranged from 76 42 feet In MW 1,to 76 53 In MW2 The relative ground water elevation at the site <br /> decreased an average of 0 39 feet between the October 1999 and January 2000 monitoring events <br /> ` Ground water was within the screened Intervals In all three wells The ground water gradient was <br /> calculated to be 0 0038 ft/ft directed N 33° E <br /> I L <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from MW2 and MW3 at concentrations of 530 <br /> parts per billion(ppb,reported as micrograms per liter) and 600 ppb,respectively EthyIbenzene and <br /> xylenes were detected In MW2 at concentrations of 6 4 ppb and 7 1 ppb, respectively BTEX , <br /> compounds were detected In the water sample from MW3 at concentrations of 55 ppb, 3 8 ppb, 29 ; <br /> I ppb and 55 ppb, respectively Petroleum hydrocarbons were not detected In the sample collected <br /> from MW 1 MTBE and other fuel oxygenates were not detected In any of the samples collected <br /> IAnalytical results of water samples collected In January 2000 are summarized'or`i Table 2 The <br /> • laboratory report (Alpha Analytical Inc Order No A00011805), chain-of-custody form and the <br /> laboratory QA/QC report are included In Appendix B <br /> Advanced GeoEnvironmental,Inc <br /> ti <br />