ARCHIVED REPORTS_XR0011430 - Laserfiche WebLink

Home Browse Search

r 17 July 2002 AGE-NC Project No. 97-0327 ' ' Page 8 of 10 BTEX constituents were detected in grab water samples collected from P-10, P-I I and P-12 at ' concentrations as high as 47 µg11 xylenes; the greatest benzene was detected from P-12 at a concentration of 2.2 4g11. ' MTBE was detected by EPA Method 8260M in grab water samples collected from P-I I and P-12 at concentrations of 4.9 4g/1 and 3.9µg11; TBA was detected in a water sample collected from P-11 at a concentration of 23 ,ug/l. VK 61 �� r, 11 z a CA Ldt s �a�.td,in P11 c� 3.0 /L . -t 4 Flo other fuel components were detected above the laboratory reporting limits. Analytical results of ' the ground water samples are summarized in Table 3. The laboratory reports (Castle Analytical Laboratory Reference No. 4392 and McCampbell Analytical Inc. Lab. I.D. 89354 through 89374) and chain-of-custody forms are presented in Appendix B. 3.6. ANALYTICAL RESULTS OF MONITORING WELL WATER SAMPLES t TPH- was detected in a water sample collected from well MW-2 at a concentration of 110 g p micrograms per liter (gg/l). TPH-d was detected in water samples collected from wells MW-2, ' MW-3 and MW-4 at concentrations as high as 110,ugIl. Benzene and xylene were detected in the ground water sample collected from well MW-2 at ' concentrations of 0.76 ,ug/l and 2.4 ,ug/l, respectively. ' Utilizing EPA Method 8260M, MTBE, TBA and 1,2-DCA were detected in sample MW-2 at concentrations of 11 µg/l, 48 µg/1 and 1.6µg11, respectively. / Y,2 DCAwr s favnd 'in MW-2 ¢&1 1. 4")L. ' �other fuel components were detected above the laboratory reporting limits. Analytical results of the ground water samples are summarized in Table 6. The laboratory reports (Castle Analytical Laboratory Reference No. 4521) and chain-of-custody forms are presented in Appendix F. 1 4.0. SUMMARY AND CONCLUSIONS The findings of the January 2002 drilling and well installation investigation results are as follows: ' Generally, silty fine to medium sand was encountered at depths of 15 feet bsg and between 75 and 90 feet bsg. Clayey silt and sandy silt with thin, discontinuous silty fine to medium r_ sand lenses was generally encountered at depths between 15 and 75 feet bsg . General ' lithology beneath the site in cross-sectional views A -A ' and B-B' is depicted in Figures 3 and 4. ' Advanced GeoEnviron►nental,Inc.