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I G Associates, Inc. <br /> TABLE 7 - REDUCTIONS IN HYDROCARBON CONCENTRATIONS IN GROUNDWATER ° <br /> SINCE INITIAL_TREATMENT SYSTEM START-UP <br /> Value Reclamation Corporation, 151 south Main Street, Manteca, California <br /> BENZENE TPH as GASOLINE <br /> Monitoring First 3 Last 3 Percent First 3 Last 3 Percent <br /> Well Sampling Concentration Sampling Concentration Sampling Concentration Sampling Concentration <br /> 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 01/23/01 1 150 05/16/97 110,000 01/23/01 6,900 <br /> 09/10/97 11000 08/01/01 140 09/10/97 110,000 08/01/01 3,600 <br /> 01/16/98 4000 11/15/01 61 01/16/98 44,000 11/15/01 1,700 <br /> Average 8,667 117 987% 88,000 4,067 954% <br /> BEI-MW1 05/16/97 220 01/23/01 <0 5 05/16/97 11,000 01/23/01 500 <br /> 09/10/97 130 08/01/01 <0 5 10/08/97 5,300 08/01/01 1000 <br /> 01/16/98 160 11/15/01 <0 5 12/17/98 3,800 11/15/01 620 <br /> Average 170 <0 5 >99 7 6,700 <71 >98 9 <br /> BEI-MW2 05/16/97 46 01/23/01 <0 5 05/16/97 6,000 01/23/01 <50 <br /> 09/10/97 13 08/01/01 <0 5 09/10/97 640 08/01/01 <50 <br /> 01/16/98 22 11/15/01 <0 5 01/16/98 5,400 11/15/01 <50 m , <br /> Average 270 <0 5 >98 1 4,013 500 >98 8 <br /> SRK-MW2 05/16/97 670 01/23/01 <0 5 05/16/97 18,000 01/23/01 <50 <br /> 09/10/97 270 08/01/01 <0 5 - 10/08/97 14,000 08/01/01 <50 <br /> 01/16/98 850 11/15/01 <0 5 12/17/98 32,000 11/15/01 <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 /> I <br /> events, the last conducted on November 15, 2001 <br />