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KLE;NFELUER w• 4 RESULTS 4.1 GROUND WATER ELEVATIONS The ground water elevations beneath the site ranged from 25.39 to 25.73 feet below mean sea level on February 21, 1991, and from 2.1.89 to 26.02 feet below mean sea level on April 9, 1991. On April 19, 1991, ground water elevations below mean sea level ranged from 24.74 to 25.64 and on June 26, 1991, they ranged from 25.89 to 26:17. 'rhe ground water elevation for the February 21, April 9, 1991, and April 19, 1991, dates were contoured to provide an estimated ground water gradient and flow direction (Piates 4 through 6). The elevation contours indicate a local ground water flow direction to the east-northeast on February 21, 1991 with a irydraulic gradiezit of approximately 0.36 percent. egg ,;trion�iocsn:�vellil ;3iir�iS up_gra+�dientwlzi }inonitorinxeilA;c r -_t�vm-d-oWhgid'diens-o€Ahe:tank excavation.•BMW 2 was alaterai gradient,well. On April 9 and 19_,,1991, the ground water flow:direction was`generally ta, he south_east` . wKit-. ail .on Both heSt��t3 ""leeper -g311kpebMTyry,21;-1991. gradient was 1.38 percent on April 9, and 1.1 percent on April 19, 1991. 4.2 ANALYTICAL RESULTS Wat_ er Samples On February 21, 1991, three water samples collected from monitoring wells MVV-1, MW-2, and MW-3 were analyzed for TPH purgeable as gasoline,TPH extractable by GC-FID and benzene,toluene, ethyl benzene and xylene (BTEX)by EPA Method 602. Concentrations of gasoline and several of the BTEX compounds were detected in samples collected from the three monitoring wells. Gasoline ranged from 1,500 to 10,000 ug/l. Benzene and xylenes ranged from 820 to 13,000 ug/1 and 360 to 2,000 ug/l, respectively. The highest concentrations were consistently detected in the water sample collected from MW-2,while the lowest concentration was detected from MW-3. Toluene was only detected in MW-2. Analytical resyats for the water samples are summarized on Table 4. The Chain-Of- Custody form and laboratory data sheets are included in Appendix E. w.. FIS-9162 8 copyright 1991 Kleinfelder, Inc.