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r r w� w �■r w r w 4� r w w 4r r r I,� �■■ <br /> Associates, Inc <br /> TABLE 7 - REDUCTIONS IN HYDROCARBON CONCENTRATIONS IN GROUNDWATER <br /> SINCE INITIAL TREATMENT SYSTEM START-UIQ <br /> Value Reclamation Corporation, 151 south'Main Street, Manteca,California <br /> BENZENEasLINE <br /> Monitoring First 3 Last 3 Percent First 3 Last 3 Percent <br /> Sampling Concentration Sampling Concentration Sampling Concentration Sampling Concentration Reduction <br /> Well Events* Events** Reduction Events* Events** <br /> (Date) (ug/1) (Date) (ug/1) (Date) (ug/1) Date (ug/I) <br /> BEI-MW3 05/16197 04/22196 160 - _ , q <br /> 09/10/97 11000 08/25/98 530 =�� -=� �� 09/10/97 110,000 08/25/98 82000 <br /> 01/16/98 4000 12/10/98 540 a = 01/16/98 44,000 12/10/98 11000 0 _ <br /> Average 8,667 410 953% $8,000 $1333 908% <br /> BEI-MW1 05/16/97 220 04/22/98 34 05/16/97 11,000 04/22/98 30000 <br /> 09/10/97 130 08/25/98 3 6 ���- <br /> u� 10/08/971 5,300 08/25/98 12000 <br /> 01/16/98 160 12/10/98 1 4 � 12/17/981 3,800 12/10/98 5100 <br /> Average 170 130 924% 6,700 1,570 76 6% <br /> BEI-MW2 05/16/97 46 L)T/TZ199- <br /> 05116/97 6,000 U4122/98 b3 0 <br /> t�A ~ma <br /> 09110/97 13 08/25/98 0 5 09/10/97 640 08/25/98 500 <br /> 01/16198 22 12/10/98 0 5 01/16/98 5,400 12/10/98 500 <br /> Average 270 0 7 974% 4,013 5110 98 7% <br /> SRK-MW2 05/16197 670 04/22/98 0 5 05/16/97 18,000 04/22/98 500 m� <br /> 09/10197 270 08/25/98 0 5 ,�, � ,,�' 10/08/97 14,000 08/25/98 500 <br /> 01/16/98 850 12/10/98 0 5 _"� 12/17/981 32,000 12/10/98 500 <br /> Avera a 597 0 5 999% 21,333 60 998% <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 December 10, 1998 <br /> I <br />