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' 10 • January 2041 AGE-NC Project No 96-0254 ' Page 4 of 6 ' 3 2 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1, MW-2, MW-3 through MW-7 on-site and GLMW-3 Isite were measured between 6 54 feet and 9 62 feet below the tops of well casings ' The ground water flow direction during this monitoring event was towards the north at an average gradient of 0 003 ft/ft In the area of the former UST area and 0 006 feet/feet north of the site Ground water elevation contours are Illustrated on Figure 3 I 3 3 LABORATORY RESULTS OF GROUND WATER SAMPLES ' TPH-g was detected In samples collected from wells MW-lB, MW-2A, MW-4, MW-7 and GLMW-3 at concentrations of 120 micrograms per liter (,Ug/1), 110,ug/l, 3,200 ,ug/l, 250 ,ug/l and ' 160,ug/l, respectively TPH-d was detected in the samples collected from wells MW-4, MW-7 and GLMW-3 at concentrations of 250,ug/l, 230 4g/l and 130 yg/1, respectively TPH-g and TPH-d were not detected in the remaining samples ' Some or all BTEX compounds were detected in each sample collected Benzene was detected In samples collected from all the wells at concentrations as high as 810 ug/l (MW-7) Toluene, ethylbenzene and xylenes were detected in these same wells at concentrations ranging from 0 56 yg/1 (xylene in MW-5) to 46 µg/l (xylene In MW-4) MTBE was detected by EPA Method 8260 in the ground water samples collected from MW-1B, MW-2B and MW-4 at concentrations of 5 0 ug/l, 2 0,ug/l and 6 7 gg/1 No other fuel oxygenates were detected in the ground water samples analysis The analytical results are summarized In Table 2 The laboratory reports MAI Laboratory ID 50886 Yt rY � ( rY to 50895), QA/QC reports and chain-of-custody forms are included in Appendix D On 19 December 2000 a quarterly monitoring event was performed at the adjacent site 2420 Grant Line Road Data obtained during this sampling event Indicates that TPH-g, TPH-d, BTEX compounds, and the five fuel oxygenates were not detected above laboratory reporting limits In monitoring well GLMW-3 The analytical results for monitoring well GLMW-3 are summarized In Table 2 The laboratory reports (MAT Laboratory ID No 56618), QA/QC reports and chain-of-custody forms are Included Iin Appendix E Advanced GeoEnvironmental Inc I