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17 June 1997 <br /> ; :. AGE Project No. 95-0118 <br /> . .� : Page 2 of 4 <br /> 3.0. FINDINGS <br /> 3.1. RELATIVE GROUNDWATER ELEVATION AND GRADIENT <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 /> ._i water elevations are summarized in Table 1 - Ground Water Elevations. <br /> During the April 1997 sampling, the depth to ground water from the casing tops at the site ranged <br /> from 34.40 to 36.41 feet. Between December 1996 and April 1997, the relative ground water <br /> elevation increased an average 1.4 feet. <br /> In April 1996, a ground water mound or `high' was present in the area of monitoring well MW-6; <br /> -1 from which point it appears that ground water has a radial flow toward the northwest and possibly <br /> southeast. The steepest gradient in the measurable area appears to be.toward the northwest at an <br /> estimated 0.007 ft/ft. Relative ground water elevation contours are illustrated in Figure 3 -Relative <br /> Ground Water Elevation. <br /> 3.2. ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> Water samples from MW-2 and MW-3 contained TPH-g at concentrations of 27,000 parts per billion <br /> (ppb, reported as micrograms per,liter)and 1,700 ppb, respectively. The same samples contained <br /> benzene at concentrations of 900 ppb and 28 ppb, toluene at 4,200 ppb and 140 ppb, ethylbenzene <br /> at 950 ppb and 170 ppb, and xylenes at 4,300 ppb and 170 ppb, respectively. <br /> Air-sparging well VW-2 was found to contain TPH-g at a concentrations of 750 ppb and BTE&X <br /> -=+ compounds at concentrations as'high as 74 ppb. Benzene was present at a concentration of 3.9 ppb. <br /> MTBE was not detected in the sample from air sparging well.VW-2. <br /> �i <br /> - The water sample collected from MW-5 contained TPH-g at a concentration of 93 ppb and benzene <br /> at a concentration of.14 ppb. Petroleum hydrocarbons had not been previously detected in MW-5. <br /> 1 No other BTE&X compounds or MTBE were detected iii the sample from well MW-5. <br /> Hydrocarbons were not detected in samples collected from MW-1, MW-4 and MW-6. Analytical <br /> results of ground water samples are summarized in Table 2 -Analytical Results of Ground Water <br /> Samples. The laboratory report(MAI Lab ID 75338 to 75344), QA/QC report and chain-of-custody <br /> -� are included as Appendix B. <br /> .f <br />