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r <br /> 23`November 1998, [ <br /> AGE-NC Project No. 95-0142 <br /> ✓p ; <br /> age 3}of 4 <br /> t I h µ 1 <br /> The ground water y • i <br /> gradient for drowned monrtormg wells,directed toward the northeastw <br /> 1, MW 2 and MW-3) is illustrated on Figure 4 ( ells'MW <br /> r r, <br /> IJ <br /> }3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> r <br /> r , a <br /> H-g was detected m samples collected from wells VW-1 through VW-4 at Concentra <br /> v <br /> ' from 390 micrograms �ugll tions ranging i <br /> from wells MW-3, MW-41 and MW-5 at con concentraTPHtions <br /> was detected 112 the sample collected <br /> ' of 220 <br /> respectively, µg/l, 150, yg/l and 240 µg/l, <br /> BTEX compounds were detected in all the samples collected from the monrtonng wells BTS <br /> compounds were detected in samples from each vapor well at concentrations as high as 36,000µg/l <br /> '(benzene, VW_I) <br /> 1r <br /> The compounds were detected in well MW S at concentrations of 3 9µgr] benzene 22 <br /> 4 9 µg/l ethyl benzene and 21 µ�toluene, <br /> concentrations of 4 1 ugA Xylene The compounds were detected in well MW-4 at <br /> �g/1 benzene, 25,ug/l toluene, 4 7µg/1 ethyl benzene and 21 u9A xylene <br /> MTBE and DIPS were the only oxygenated compound detected in water samples collected <br /> site MTBE was detected to the ground water samples collected fr from the <br /> VW-3 and VW-4 at concentrations of 1 I = 13 om wells MW-5, VW-1, VW-2, <br /> µms' 580 u µms, 61 ug/I and 23g/l,respectively <br /> RIPE was detected in well MW-5 at a concentration of 8 3 µgll. <br /> r <br /> Analytical results for the ground water samples analyzed by EPA'Methods 8015 and 802 ; <br /> `lsummanzed in Table 2 Analytical results for the ground water samples as anal zed b pare <br /> Y y EPA Method' <br /> 8260(m) are summarized in Table 3 The laborato report'' r throu h 95724 rY P (MAI Laboratory I D Nos 95718 <br /> g ),quality assurance and quality control (QA/QC)report and chain-of-custody form Y <br /> are included in Appendix B � 'i <br /> 4.0. CONCLUSIONS y ' <br /> Based'on data collected from the site, AGE concludes <br /> Ground water flow direction for this <br /> feet/feet or 12 9 feet/mile quarter was toward the northeast at a gradient of 0,0024 <br /> Ground water levels are `above the screened intervals of groundwater monitoring wells <br /> Mw-,1, MW-2 and MW-3, these wells <br /> phase hydrocarbon plume The well screen intervals of ell, ch actenie the dissolved- <br /> , ' <br /> MW-5 and vapor wells <br /> VW-1 throughaWV74 were adequate to characterize the dissolved-phase hydrocarbons plume. <br /> Advanced GeoEnvironm'entai,toe:- <br />