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06 November 2000 . AGE-NC Project No: 97-0327. Page 3 of 4 F Ground water monitoring data collected in'the area of wells.MW-1 MW-2 and MW-3 indicatedthat the ground water flow direction-was generally'toward the;southeast at a gradient.of 0.004.ft/ft, or _ approximately 21 feet per,mile (Figure 3).. : w 3.2. LABORATORY RESULTS OF GROUND'WATER SAMPLES A total,of three ground water samples were submitted� to-,a DHS-certified laboratory for-analysis of..r TPH-g,•TPH-d;BTEX and fuel oxygenated compounds. TPH-g.was,detected in the ground water' -sample collected from MW-1 at a concentration of 490µg/I. TPH-d was detected in all three samples at concentrations as high as.430,ug/l,-however the laboratory.reported the sample chromatograms to not have,typical diesel characteristics. r- BTEX compounds were detected in the � p groundwater sample collected from MW-2 at concentrations . •s as.high as 8.3 µl/l MTBE was detected utilizing EPA Method 8020 in ground water samples collected from wells MW-1.and MW-2-at concentrations of,1.6 and 8.5µg11 respectively;MTBE was detected from _ MW-1 and MW-2 utilizing EPA Method 8260M at concentrations of 2.1 and 10µg/1 respectively. ., TBA was detected inoundwater sam les collected in sam �' p _ ples from wells MW-1,MW-2 and MW- 3 at concentrations as-high-as 36,ug/l, 1,2-DCA was detected in-samples,from wells MW-1 and MW- 2 2 at concentrations of 4.4 and 6.8 4g11. No other fuel oxygenated compounds were detected by laboratory analysis. Analytical results of theground water "samples are summarized in Table 2. The laboratory reports-(Castle Analytical Laboratory Reference No. 3191 and McCampbell Analytical Inca Lab I.D. 46891 through 46893) and chair'-of-custody forms are:presenfed in Appendix B. 4.0. DISCUSSION-AND CONCLUSIONS' 'Th% e-.implications of the-findings from the August 2000 ground-w.ater monitoring event are ,as follows: Ground water monitoring data collected in the area'.of wells MW=1; MW-2 and.MW-3 �. indicated aground water flow direction generally toward the southeast at a gradient of 0.00.4 ft/•ft._Due'to the low gradient at the site, slight variations-in ground water-measurements or changes of rcohargeldischarge of the local ground water could greatly modify ground water.. } _ flow direction. . The decrease of ground water elevation of approximately 3 feet between the'May 2000"and- August 2000 monitoring events.is.probably attributable to seasonal fluctuation. C` . .. Dissolved TPH-g and BTEX were detected only in the sample collected from well MW-2. Minor concentrations:of dissolved TPH=d, 1,2-DCA and TBA were detected in samples from ' Advanced GeoEnvironmental,Inc. j