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13 October 1997 <br /> AGE Project No. 95-0118 <br /> Page 2 of 4 <br /> —j Each sample was analyzed in accordance with EPA methods 5030/8015m for total petroleum <br /> J hydrocarbons quantified as gasoline'(TPH-g),in accordance with EPA methods 8020 for volatile <br /> aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X) and in accordance with EPA <br /> methods 8240 and 8260 for.methyl-tert-butyl ether (MTBE) and other oxygenated fuel additives, <br /> including tertiary butyl alcohol (TBA), di-isopropyl ether(RIPE), ethyl tertiary butyl ether(ETRE) <br /> and tertiary amyl methyl ether (TAME) and other volatile organic compounds. <br /> 3.0. FINDINGS <br /> 3.1. RELATIVE GROUND WATER ELEVATION'AND GRADIENT <br /> -:f <br /> The relative ground water elevation in each well was calculated by subtracting the ground water <br /> depth from the surveyed relative casing elevation The depth to ground water and the relative ground <br /> water elevations are summarized in Table 1 - Ground Water Elevation Data. <br /> During the August 1997 sampling,the depth to ground water from the casing tops at the site ranged <br /> ' from 36.76 to 38.60 feet. Between April and August 1997, the average depth to ground water <br /> increased an average 2.5 feet. In August 1997,the ground water flow was toward the northwest. The. <br /> steepest gradient in the measurable area was estimated to be 0.0075 ft/ft. Relative ground water <br /> elevation contours are illustrated in Figure 3 -Relative Ground Water Elevation. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Water samples from MW-2 and MW-3 contained TPH-g at concentrations of 1,100 micrograms per <br /> liter: ,uglL (parts per billion: ppb) and 1,200 ppb,respectively. The same samples contained benzene <br /> at concentrations of 6.4 ppb and 33 ppb, toluene at 45 ppb and 230 ppb, ethylbenzene at 61 ppb and <br /> .I 43 ppb, and xylenes at 230 ppb and 210 ppb, respectively. <br /> The water sample collected from air-sparging well VW-2 contained significant concentrations of <br /> TPH-g,quantified at 2,500 ppb and BTE&X compounds were detected at concentrations as high as <br /> 300 ppb. Benzene was present at a concentration of 93 ppb. <br /> The water sample collected from MW-5 did not contained detectable concentration of TPH-g or <br /> BTE&X compounds. MTBE, TBA, DIPE, ETBE, TAME were not detected in any of the water <br /> samples analyzed. <br /> ✓ Advanced GcoEnvironmenta[,Inc. <br />