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.r I i ..•r S u I } � n��. l r' —1,r 5 � t i. r } '. F' �- � 1, - p I ^ jj 20'November 1998 �< 5 r 4 '} :� s t o 3- r, fi r �' V 'r SAGE-NC'Project Na..95 0114 ti ' '� t 'r I'age 3 of 5 1- �f I i 1 •. r .• more`than five'feet above the tops-of the;screened interval in all five manitonnig wells;during both .. ,• _ . of the sampling events. The'ground'water samples only.be representative of the;ground water which 1` entered into the wells`after the purge event'' d:therefore'inay not be fully:representative of ground water conditions:at or'nea the topof the saturated soil zone.or capillary-zone; where`the greatest ,, Impact to ground'water maybe anticipated 'The'ground watergradient inferred from`the March 1998 samplmg event appears to be§teepest,from MW-2 flowing northwest towardwvell MW-1.arid lesssteep,in the area between MW=1 and MW-s5 flowed toward the southeast. 4: .The ground water gradient'inferredfrom the July,I998 sampling event appears,to be steepest from MW-2 flowing northward iowardMW3 and less steep in the area between MW-4 flowirig,southeast. toward well MW-3'. Groundwater elevation-data are summarized in`Table 1. The relative-ground water elevation for-the March 1998 sampling is depicted in Figure 3:.'and the ground:water..elevatian for the July'1998 '. sampling is depicted in Figure 4. 3.2.; PETROLEUM HYDROCARBON-IMPACTED�GROUND'WATER During the March 1998 sampling,TPH•-ss was detected in monitoring'.wells MW-1 MW72 and MW- J+ 3 at concentrations of 79 micrograms per liter(ize), 540µg/l and 1,400 µg/l, respectively. TPHy ss > -was not detected in the samples collected frormwells M'W-4 or.MW-5 during this sampling event: BTEX compounds were detected in the water sample collected=from monitoring well MW-3, which contained 0.51 µg/l benzene,4.7,µg/l ethylbenzene and 8 µg/1 xylenes. Xylenes were also detected 'in the water sample from.well MW-2 at a concentration of 2.8 µg/1. During the July 199.8 sampling,TPH-ss was detected in monitoring wells MW=I,MW-2 and MW-3' . at concentrations of 97,Lig/1;300µg/1 and 2,000 ug/l,'respectively: TPH-ss'was not detected in the •: samples collected from wells MW-4•or MW-5 during this sampling event. Two'BTEX compounds ' were detected in the-water sample collected from monitoring well MW-3,'which contained 8.4µg11 ; ethylbenzene and"15�µg/l xylene'. Xylenes were also'detected in the water sample from well MW-2 ' at a,concentration of 0.61 µg11. . ,s nalytical results-of ground water.samples are summarized in Table I'The laboratory repdrffor Ivlarch and July (MAJ Laboratory'1D numbers;87570 through 87574 and 91476 through 91480),. 'uali assurance and ua i control A/ C report and.chain-of-custod form.are included in '{ t3'. 9 ty (Q Q ) P Y ' z Appendix C. Advuneed Ge6inV40nMental,Inc. 4 f''• �- S -- ' .i 1,W