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Page 6 December 15, 2002 <br /> Chemical Parameters <br /> Groundwater Quality <br /> The first groundwater sample (,lune 19, 2002) from MW No 4, located up-gradient of <br /> the general contaminated areas, was non detect, while 3 months later it was 0 003 <br /> mglltr greater than the detection level of 0 050 mglltr for diesel <br /> Volatile fractions such as Benzene, Toluene, Ethyl-benzene and Xylene (BTEX) were <br /> not detected in any sampled groundwater BTEX samples will be collected and <br /> analyzed in the December 2002 sampling event In the event BTEX findings <br /> continue to be non-detect it is likely we will request discontinuance of BTEX sampling <br /> Samples from MW Nos 1 through 3 and 5 through 6 indicate petroleum hydrocarbon <br /> contamination of varying degrees The hydrocarbon fraction found in all MW locations <br /> may be classified as "diesel' Grab samples (December 2000) from the bottom of <br /> borings BH Nos C-4/C-6 and C-5/C-7 indicated a lighter extractable C10-C-28 <br /> fraction The borings were grouted closed after collecting samples and could not be <br /> retested Chromatograms from laboratory analysis were submitted in the last interim <br /> report along with complete laboratory reports The most recent September sampling <br /> laboratory findings are included herewith Reference ATTACHMENT 4, EXTRACTS <br /> FROM ANALYTICAL LABORATORY FINDINGS- September 24,2002 <br /> During the September sampling, the "diesel" fraction was detected at levels between <br /> 0 053 and 1 5 mglltr Levels in MW No 1, the original MW installed in December <br /> 2000, continued to decrease from 2 31 mglltr There was a decrease to Non detect <br /> levels of the lighter extractable C10-C16 fraction also found in MW No 1 <br />