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M manse M <br /> ATC Associates, Inc <br /> TABLE 7 - REDUCTIONS IN HYDROCARBON CONCENTRATIONS IN GROUNDWATER <br /> SINCE INITIAL TREATMENT SYSTEM START-UP <br /> Value Reclamation Corporation, 161 south Main Street, Manteca, California <br /> BENZENE TPH as GASOLINE <br /> Monitoring First 3 Last 3 Percent First 3 Last 3 Percent <br /> Sampling Concentration Sampling Concentration Sampling Concentration Sampling Concentration <br /> Well Events' Events"" Reduction Events" Events` Reduction <br /> (Date) (ug/1) (Date) (ug/1) (Date) (ug/1) Date (ug/1) <br /> BEI-MW3 05/16/97 11000 01/21100 210 05116/97 110,000 01/21/00 8,200 <br /> 09/10/97 11000 06/23100 83 09110/97 110,000 06/23100 4,000 <br /> 01/16/98 4000 01/23/01 150 01/16/98 44,000 01/23101 6900 <br /> Average 8,667 148 98.3% 88,000 6,367 92 8% <br /> BEI-MW1 05/16/97 220 01/21/00 <0 5 05/16/97 11,000 01/21/00 1400 <br /> 09/10/97 130 06/23/00 <0 5 10/08/97 5,300 06/23/00 1400 <br /> 01/16198 160 01123/01 <0 5 12/17/98 3,800 01/23/01 <50 <br /> Average 170 <0 5 >99 7 6,700 <93 >98 6 <br /> BEI-MW2 05/16/97 46 01/21/00 <0 5 05/16/97 6,000 01/21/00 <50 <br /> 09/10/97 13 06123/00 <0 5 09/10/97 640 06/23/00 <50 <br /> 01116/98 22 01/23/01 <0 5 01/16/98 5,400 01/23/01 <50 <br /> Average 270 <0 5 X98 1 4,013 <50 >98 8 <br /> SRK-MW2 05/16/97 670 01/21/00 <0 5 05/16/97 18,000 01/21100 <50 <br /> 09/10/97 270 06/23/00 <0 5 10/08/97 14,000 06/23/00 <50 <br /> 01/16/98 850 01/23/01 <0 5 12/17198 32,000 01/23101 <50 <br /> Average 597 <0 5 >99 9 21,333 <50 >99 9 <br /> " = Represent the results of the three groundwater monitoring events conducted prior <br /> to the startup of the groundwater extraction system in February 1998 <br /> Represent the results of the last three quarterly groundwater monitoring <br /> events, the last conducted on January 1, 2001 <br />