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07 February 2001 <br /> AGE-NC Project No 95-0130 <br /> Page 6 of 8 <br /> ' substantial peaks of chlorinated hydrocarbons MTBE and PCE were detected in all four grab <br /> water samples with the greatest MTBE concentration detected at 73 to 76 feet bsg and the <br /> greatest PCE concentration detected at 101 to 104 feet bsg Low concentrations of TCE and <br /> ' 1,2-DCE were detected in samples from 43 to 46 feet bsg and 73 to 76 feet bsg Constituents <br /> of concern detected at P-7 are depicted by informal hydrogeologic units in cross sectional <br /> view C-C'(Figure 5) <br /> ' Variable concentrations of TPH-g,TPH-d,MTBE and PCE were reported from P-9 at depths <br /> between 44 and 118 feet bsg TPH-g was only detected In a grab water sample collected at <br /> ' a depth between 115 and 118 feet bsg,however, the laboratory reported the TPH-g sample <br /> chromatograms from P-9 as having substantial peaks of chlorinated hydrocarbons TPH-d <br /> was detected in two consecutive samples collected between 63 to 66 feet bsg and 83 to 86 <br /> ' feet bsg PCE was detected in three consecutive samples collected between 44 to 47 feet bsg, <br /> 63 to 66 feet bsg and 83 to 86 feet bsg Low concentrations of MTBE were detected at vaned <br /> depths between 44 to 47 feet bsg and 83 to 86 feet bsg Constituents of concern detected at <br /> tP-9 are depicted by informal hydrogeologic units In cross sectional view D-D'(Figure 6) <br /> • Variable concentrations of TPH-g, TPH-d, MTBE, PCE, TCE and 1,2-DCE were reported <br /> from off-site boring P-10 at various depths between 29 and 146 feet bsg TPH-g was detected <br /> ' in three consecutive grab water samples at depths of 29 to 32 feet bsg, 59 to 62 feet bsg and <br /> 82 to 85 Leet bsg, however, the laboratory reported that the TPH-g sample chromatograms <br /> ' from P-10 as having substantial peaks of chlorinated hydrocarbons TPH-d was detected In <br /> three samples at depths of 29 to 32 feet bsg, 82 to 85 feet bsg and 133 to 136 feet bsg Low <br /> concentrations of MTBE were detected at depths of 29 to 32 feet bsg, 59 to 62 feet bsg, 82 <br /> ' to 85 feet bsg and 133 to 136 feet bsg PCE was detected In four consecutive samples <br /> collected at depths of 29 to 32 feet bsg, 59 to 62 feet bsg, 82 to 85 feet bsg and 108 to 1 1 1 <br /> feet bsg Low concentrations of TCE and 1,2-DCE were detected only in the sample from <br /> ' 59 to 62 feet bsg Constituents of concern detected at P-10 are depicted by Informal <br /> hydrogeologic units In cross sectional view C-C'(Figure 5) <br /> • The greatest TPH-g-Impact was reported from the Fitst Water Zone sample collected at <br /> MW-2, Second Water Zone, Third Water-Zone and Primary Aquifei Zone TPH-g impacts <br /> were reported from P-8 at a depth of 50 to 53 feet bsg and 112 to 115 feet bsg, from P-7 at <br /> a depth of 101 to 104 feet bsg and from P-10 at a depth of 29 to 32 feet bsg, however, the <br /> laboratory Indicated that the TPH-g values may be Inflated due to chlorinated hydrocarbons <br /> being detected in the TPH-g analysis <br /> • The greatest MTBE-impact was reported from the First Water Zone sample collected at <br /> MW-2, Second Water Zone Third Water Zone and Primary Aquifer Zone MTBE-impacts <br /> were reported from P-7, P-8, P-9 and P-10 at depths between 50 and 137 feet bsg, generally <br /> tMTBE concentrations decreased with depth, <br /> • The greatest BI EX-Impact was reported from the First Wutet Zona sample collected at <br /> 4dvanced GeoEnvironmen[al Int <br />