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• Page 6 March 19,2003 <br /> Chemical Parameters <br /> 1 Groundwater Quality <br /> The first groundwater sample (June 19, 2002) from MW No 4, located up-gradient of <br /> the general contaminated areas, was non detect, 3 months later it was 0 003 mglltr <br /> greater than the detection level of 0 050 mglltr for diesel and 6 months later <br /> (December) it was again below detection level of 0 050 mglL <br /> ' Volatile fractions such as Benzene, Toluene, Ethyl-benzene and Xylene (BTEX) were <br /> again not detected in any sampled groundwater BTEX samples will be collected and <br /> analyzed in the March 2003 sampling event In the event BTEX findings continue to <br /> be non-detect it is likely we will request discontinuance of BTEX sampling <br /> ' Samples from MW Nos 1 through 3 and 6 indicate low levels of petroleum <br /> hydrocarbon contamination The hydrocarbon fraction found in all MW locations may <br /> be classified as "diesel' Grab samples (December 2000) from the bottom of borings <br /> ' BH Nos C-4/C-6 and C-5/C-7 indicated a lighter extractable C10-C-28 fraction The <br /> borings were grouted closed after collecting samples and could not be retested <br /> Chromatograms from laboratory analysis were submitted in the June interim report <br /> 1 along with complete laboratory reports The most recent December sampling <br /> laboratory findings are included herewith Reference ATTACHMENT 4, EXTRACTS <br /> FROM ANALYTICAL LABORATORY FINDINGS-December 20, 2002 <br /> During the December sampling, the "diesel" fraction was detected at levels between <br /> 0 34 and 15 mglltr Levels in MW No 1, the original MW installed in December <br /> 2000, continued to decrease from 2 31 to 1 5 mglltr There was a decrease to Non <br /> detect levels of the C10-C28 fraction found in MW No 5 <br /> 1 <br /> 1 <br /> 1 <br /> i <br /> 1 <br /> 1 <br />