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3 GROUNDWATER MONITORING RESULTS <br /> Groundwater elevation data, and analytical results are discussed in this section <br /> 31 Groundwater Elevation Data <br /> Groundwater elevations measured in site monitoring wells on August 18, <br /> 1999 (summarized in Table 1), ranged from minus (-) 21 10 feet to —22 67 <br /> feet MSL Groundwater levels in the wells decreased approximately 2 feet <br /> from the May 1999 monitoring event As shown in Figure 3, the groundwater <br />' flow direction is east-northeast (approximately N60E) at a gradient of about <br /> 4 3 x 10`3 feet per foot, which is consistent with historic trends <br /> 3.2 BTEX and TPH-G Analytical Results <br /> BTEX concentrations were measured in all of the samples collected during <br /> this monitoring event Higher BTEX concentrations appear to be centered <br /> near the former gasoline USTs and the locations of piezometer PZ-1 and <br />' sparge well SP-1 (see Figure 4) <br /> Benzene concentrations ranged from 11 µg/l, in the sample collected from <br /> monitoring well MW-13, to 3,700 µg/l in the sample from piezometer PZ-1 <br /> Toluene ranged from 13 µg/l, in the sample from MW-9, to 2,800 µg/l in the <br /> sample from PZ-1 Ethylbenzene ranged from 16 µg/l in the sample from <br /> MW-9 to 890 µg/l in the sample from SP-1 Xylenes ranged from 64 µg/1, in <br /> the sample from MW-9, to 4,200 µg/l in the sample from SP-1 <br /> Higher TPH-G concentrations also appeared to be centered in the vicinity of <br /> the former gasoline USTs (Figure 5) TPH-G concentrations ranged from 340 <br /> µg/l, in the sample from well MW-9, to 21,000 µgIl in the sample from PZ-1 <br /> 3.3 Oxygenates Analytical Results <br /> There were no oxygenate compounds detected, except DIPE in the <br /> groundwater sample collected from well MW-12 (see Figure 6) The DIPE <br /> concentration in the MW-12 sample was 26 µg/l Acculab's method detection <br /> limits for the groundwater samples from wells MW-1 and SP-1, and from <br /> piezometers PZ-1 and PZ-2, were excessive because of reported gasoline <br /> interference Acculab did not notify Philip of this interference and the <br /> resulting detection limits until after the sample's holding time had expired A <br /> re-testing of these samples at appropriate dilutions and detection limits, after <br /> the expiration of holding time, would have resulted in questionable data <br /> August 1949 Groundwater Monitoring Report <br /> Prepared for THE EARTEIGRAINS COMPANY Prepared by Philip Services Corp <br /> L\62400132U21382EG\6240014510899MON DOC October 8 1999 <br />