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MPDS-i1N6981 14 sr February 18 1997 Page 11 of 14 Table 2 Summary of Laboratory Analyses Water Ground.Water ELOVatiOn TPR U Ethyl-- Well# Date (>MO Gasoline Benzene Toles Benzene xylenes MTBE VW-3 1/21/97 NA <50 <0 5 <0 5 <0 5 <05 58 10/23/96 SAMPLED SEMI-ANNUALLY 7/24/96 NA <50 <05 <05 <0 5 <0 5 <5 0 VW-4 1/21/97 NA 3,000 <0 5 5 3 31 530 <5 0 10/23/96 SAMPLED SEMI-ANNUALLY 7/24/96 WELL WAS DRY § Sequoia Analytical Laboratory has identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 µg/L in the sample collected from this well * The analytical results of the ground water samples collected from monitoring wells were inconsistent with the previous analytical results for these wells Therefore, MPDS Services, Inc , resampled the monitoring wells Sequoia Analytical Laboratory reported that the hydrocarbons detected did not appear to be gasoline * The positive result for gasoline does not appear to have a typical gasoline pattern <# Non-detectable at or above stated detection limit t MTBE analyzed by EPA method 8260 in parentheses tt FieId blank MTBE = Methyl tert butyl ether -- Indicates analysis was not performed NA = Not applicable Results are 1n micrograms per liter(µg/L), unless otherwise indicated Note The detection linut for results reported as ND by Sequoia Analytical Laboratory is equal to the stated detection limit times the dilution factor indicated on the laboratory analytical sheets Prior to August 1, 1995, the total purgeable petroleum hydrocarbon(TPH as gasoline) . quantification range used by Sequoia Analytical Laboratory was C4-C12 Since August 1, 1995, the quantification range used by Sequoia Analytical Laboratory is C6 -C12 Laboratory analyses data prior to October 20, 1993, were provided by GeoStrategies, Inc