Laserfiche WebLink
09 June 2003 F <br /> "AGE-NC Project No. 95-0106 <br />'. Pdge2of4 <br /> "Department of Health Services-certified analytical laboratory. for analysis. The samples were <br /> analyzed for: <br /> ;.' <br /> " Total petroleum ,hydrocarbons quantified as gasoline (TPH-g) in accordance with N <br /> ,EPA Method 8015-Modified, and <br /> • Benzene,toluene, ethylbenzene, and-total xylenes (BTE&X)and methyl tern ' <br /> (MTBE) in accordance with EPA Method 8021'. y tertiary-butyl ether <br />��. 3A FINDINGS <br /> Ground water elevation and flow direction were inferred from field data. The hydrocarbon impact • <br /> 'to ground water was.• uanti <br /> q fieri by laboratory analysis of the ground water samples.. <br /> 31. GROUND WATER ELEVATION AND FLOW DIRECTION. <br /> The relative ground water elevation ranged from 33.00 feet (MW-6 upper) to 33.84 feet MW-2 <br /> decreasingan ( )� . <br /> average of 0.27 feet since the December,2002 monitoring event. The water table <br /> appears as'a northerly plunging ridge; the east limb of the ridge flows toward thenortheast at a <br />�. gradient of approximately 0.004 fUft and the west limb flows toward the north-northwest at a <br /> gradient of approximately 0..005 ft/ft. Ground water,elevation data is presented in Table 1 while the <br /> 'contoured ground water elevation data is shown ori,Figure 3. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SIMPLES <br /> Petroleum hydrocarbons were detected in the groundwater samples collected•frothmonitoring wells <br /> MW-I and.MW_4'. TPH-g was detected in both wells at concentrations of 3,000 micrograms per liter <br /> (µg11) and 5,400 µg/l,-respectively(Figure 4). Benzene was also detected at 55 0` I and 75 <br /> µ µg/1 in <br /> samples MW=1 and MW-4; 'respectively. Other concentrations of volatile aromatic'compounds <br /> detected in'samples MW-1 and MW-4 include 126 �ig/l and 18 µg/1 oftoluene, 39 µg/i and 200µg/1 <br /> of ethylben2ene;;and'150 and 76 1 of t' <br /> µ� µg/ xylenes, respectively. <br /> Neither TP' <br /> H-g nor BTE&X compounds were detected in theground water samples from monitoring <br /> wells MW-2, MW-3, MW-5,MW-6 (upper), MW-6 (lower) and MW-7. <br /> MTBE was.not detected in 'an of the. • '` <br /> y ground water samples. 'Analytical. results of ground water <br /> samples are summarized on Table.2.•The laboratory report (MAI Lab IDs 0303425-OOIA through <br /> 0303425-008A <br /> ), QA/QC and chain-of-custody are included in Appendix C. <br /> Advanced GeoEnvironmentaf,Inc. <br />