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10 November 1999 <br /> AGE-NC Project No 98-0450 <br /> tPage 3 of 4 <br /> Table 1 shows the screen intervals for monitoring wells BMW-3, BMW-4 and BMW-5 and the <br /> assumed screen intervals for monitoring wells BMW-1 and BMW-2 Well MW-5 may be screened <br /> approximately 3 feet below the ground water table The analytical results obtained are believed to <br />' be representative of the dissolved hydrocarbon concentrations in the shallow ground water at the site, <br /> as the well are screened across uppermost ground water <br /> Ground water monitoring data collected at the site indicated a southerly and south-southwesterly <br /> ground water flow direction from the former UST location <br />' Based on a southerly to southwesterly flow direction within the area contained by the six monitoring <br /> wells well MW-5 is in the most down-gradient positron from the former dispenser system and well <br />' BMW-1 and BMW-2 are down gradient from the former UST area <br /> In August 1999, the gradient was calculated to be approximately 0 003 on the site or 17 6 feet per <br />' mile (Figure 3) <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g and BTEX were detected in all of the ground water samples collected and analyzed <br />' Benzene was detected at concentrations u to 1,000 micrograms per liter /l as detected in the <br /> p g P (µg }, <br /> sample from well BMW-4 TPH-g concentrations in the samples ranged from 250µg/1 from well <br />' BMW-3 to 36,000µg/I from well BMW-4 TPH-d was detected at concentrations up to 6,700 /'�g/l <br /> in the sample from well BMW-4 Gasoline range compounds were typically detected in the TPH-d <br />' reporting range on the analytical chromatography <br /> MTBE was detected by EPA Method 8020 at concentrations ranging fiorn 85 µg/l (BMW-1) to 360 <br /> µg/l (MW-5) and by EPA Method 8260 Modified at concentrations ranging from 3 0 µg/l (BMW-5) <br /> to 420µg/l (MW-5) TBA was detected in three samples at concentrations up to 170 ,ug/1 TAME, <br /> D1PE and ETRE were not detected by laboiatory analyses of any of the ground water samples <br /> The laboratory report (McCampbell Analytical Inc Laboratory l D No 18247 to 18252), Quality <br /> Assurance and Quality Control Data (QA/QC) and chain-of-custody forms are presented in <br /> Appendix B The results of the analyses are contained in fable 2 and Table 3 <br /> Arh uuced CcoEn�ii unnicnt►I,Inc <br />