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' 16 May 2002 AGE-NC Project No. 98-0440 IPage 3 of 5 Each-sample.was analyzed for: •' •, TPH-g and TPH-d by'EPA Methods 8015M/5030/3550; ' BTEX.and MTBE by EPA Method:8020; • The fuel additives DIPS, ETBE, MTBE, TAME; TBA, EDB and 1,2-DCA in accordance with EPA Method 82601VI �. 3.0. FINDINGS Ground water elevation, flow.direction, and gradient were determined from field data collected on 25 March 2002;the c.ontaminant.impact to ground water was quantified by the laboratory analytical ' data. 3.1. ANALYTICAL RESULTS OF GRAB GROUNDWATER SAMPLES - •' TPH- was detected in the water samples collected from B8 and B9 at concentrations of 71 g p micrograms per liter, (µg/1) and 88 gg/l, respectively. TPH-d was detected in the water sample ' collected from B9 at a concentration of 140 gg/l. Ethylbenzene and total xylenes were detected in the sample from B8 at concentrations of 1.2 µg/l and 1.3 gg/l, respectively. Toluene, ethylbenzene and total xylenes were detected in the water sample collected'flom boring B9 at concentrations of 0.62-gg/l,0:72 µg/l and 4.3 µg/1,respectively.No other analytes were detected at or above laboratory' reporting limits in the grab ground water samples analyzed. . _ ' Analytical results of gab ground water samples.are summarized on Table 3. The laboratory report . (MAI Lab I.D. Nos. 88232 through 88233), quality assurance and quality control (QA/QC) report and chain-of-custody form's are,included in Appendix B. 3.2: GROUND WATER GRADIENT,AND FLOW DIRECTION - The elevation of ground water in each well was calculated by subtracting'the depth-to ground water from the surveyed well casing elevations (Table 1). Depths to ground water ranged, from 13.59 feet to14.20 feet below the well casing tops. Ground . water elevations-at the site ranged from 26.10 feet:above mean sea level (MSL) in well MW3 to , ' 26.87 feet above MSL in well MW1. Ground water elevations at the site'decreased an average of ' Advanced GeoEnvironmental,Inc.