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09 February 2001 <br /> AGE-NC Project No. 98-0520 <br /> Page 2 of 4 <br /> as a sample preservative, and into 1-liter glass-amber bottles without a preservative. After collection," <br /> the samples were properly labeled laced in a chilled container and transported under, chain=of- <br /> P P P Y � P P <br /> custody to McCambell Analytical, Inc: (MAI). The samples were analyzed for: <br /> • <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030/8015M;. <br /> ' Volatile aromatic compounds -.benzene, toluene, ethyl benzene and xylene (BTEX) and <br /> methyl tertiary- butyl ether(MTBE) in accordance with.EPA Method 8020; and <br /> ' •• Fuel oxygenates,including tertiary butanol(TBA), di-isopropyl ether(DIKE), ethyl tert•-butyl <br /> ether (ETBE), tert-amyl methyl ether (TAME); and MTBE, with 1,2-dichloroethane. <br /> (1,2-DCA) in•accordance with EPA Method 8260B. <br /> After purging and sampling each well, the stainless steel bailer was cleaned in an Alconox solution <br /> and rinsed in tap water prior to preceding to the next well. <br /> 3.0. FINDINGS <br /> Ground water elevation, and flow direction were determined from field data; hydrocarbon-impact <br /> to ground water was assessed by laboratory analysis of ground water samples. <br /> I3_1. 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 casing elevations(Table 1). Depths to ground water ranged from 17.99 feet <br /> to 18.76 feet below the tops of the well casings. Ground water elevations at the site ranged from <br /> 18.28 feet (MW-2) to 18.3.6 feet (MW-4) above mean sea level <br /> The ground water flow direction was determined using ground water elevation data. The ground , <br /> water underlying the site was flowing west at an average gradient of 0.0008 ft/f1. At low.gradient,, <br /> small measurement variations can greatly affect the inferred flow direction. Figure 3 illustrates the <br /> contouredground water elevations as measured on 07.December 2000. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES - <br /> TPH-g was detected in all' the water samples analyzed at concentrations' ranging from 360 <br /> micrograms per liter(ug/1) in MW-4 to 11,000 4g/1 in MW-5. <br /> Advanced GeoEnvironmental,inc. <br />