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• Page 6 September 16, 2002 The relative depth to water measurements at WOS MW No 1 indicate the surface of the ground water has vaned as follows rMonitoring Well No 1 Date WL FT ' Measured below TOC 12/21/00 4768 3130101 4711 lowest elevation of water 1/9102 4964 highest elevation of water 4/11/02 4835 6/19/02 4870 Reference ATTACHMENT 6, GROUNDWATER SAMPLING FORM Chemical Parameters Groundwater The first ground water sample (June 19, 2002) from MW No 4, located up-gradient of the general contaminated areas, was non detect Volatile fractions such as Benzene, Toluene, Ethyl-benzene and Xylene (BTEX) were not detected in any sampled ground water Samples from MW Nos 1 through 3 and 5 through 6 indicate petroleum hydrocarbon contamination of varying degrees The hydrocarbon fraction found in all MW locations may be classified as "diesel' Grab samples (December 2000) from the bottom of borings BH Nos C-4/C-6 and C-5/C-7 indicated a lighter extractable C10-C-28 fraction The borings were grouted close after collecting samples and could not be ' retested Chromatograms from laboratory analysis are attached Reference ATTACHMENT 4, EXTRACTS FROM ANALYTICAL LABORATORY FINDINGS- DECEMBER 20, 2002, MARCH 30, 2001, JANUARY 9, 2002 & April 11,2002 The "diesel' fraction was detected at levels between 0 058 and 16 mglltr Levels in MW No 1, the original MW installed in December 2000, have decreased from 2 31 to the June 2002 level of 16 mg/Itr There was a decrease to Non detect levels of the lighter extractable C10-C16 fraction found in MW No 1 ' Soil Soil contamination from petroleum hydrocarbons was found in several areas of varying depth and concentrations Levels of BTEX were detected in previous ' exploration in the 10 to 15 FT bgs zone along the east fence at less than 100 ug/kg and ata deeper 25 FT bgs at levels of 688 ug/kg of Xylene During earlier testing in March 1999 Galardo identified considerable BTEX in BH No B-1 in the vicinity of later ' installed MW No 1 and in BH No 2 near the east fence Diesel contaminated soil was found near MW No 4 particularly in the 25 to 30 FT bgs