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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(µg/L) _ Well Elevation to Water Elevation Thickness EthyI- Number Date (feet) (feet) (feet) _ (feet) Benzene Toluene benzene Xylenes TPH-g MTBE SW2 12/13/00 SW2 03/08/01 -- -- -- -- -- -- -- -- -- SW2 06/21/01 SW2 09/20/01 -- __ __ SW2 12/04/01 7 53 1850 -1097 000 SW2 03/05/02 7 53 -- -- __ SW2 06/11/02 7 53 _- SW2 09/10/02 753 SW2 12/18/02 753 __ _ _ V1 05/02/91 857 31 74 -23 17 000 20,000 49,000 4,700 25,000 130,000 -- VI 07/16-17/91 8 57 3270 -2413 000 14,000 44,000 3,000 15,000 170,000 -- V1 10/15/9t 8 57 33 25 -2468 000 18,000 51,000 4,200 23,000 200,000 -- V1 01/28/92 857 3151 -2294 Sheen 20,000 58,000 2,400 23,000 150,000 VI 04/30/92 8 57 31 12 -22 55 000 15,000 43,000 3,000 18,000 130,000 VI 08/13/92 8 57 33 17 -2460 000 12,000 44,000 3,600 20,000 180,000 VI 10/08/92 857 3376 -25 18 0 01 Not sampled-LPH VI 02/23/93 8 57 3047 -2190 000 9,800 19,000 3,700 18,000 100,000 VI 05/18/93 8 57 -- -- __ __ -- VI _V1 08/22/93 8 57 2970 -21 13 000 VI 12/30/93 857 2905 -2048 000 V1 02/17/94 857 28 73 -20 16 000 -- -- -- __ __ VI 05/10/94 857 2833 -1976 000 8,200 37,000 3,600 17,000 110,000 VI 08/02/94 8 57 -- -- __ -- VI _VI 11/01/94 857 3005 -2148 000 VI 02/17/95 857 2763 -1906 000VI 05/11/95 8 57 2487 -1630 000 VI 08/24/95 857 -- -- VI 10/19/95 857 Well dry V1 02/13/96 857 Well dry VI 04/18/96 857 Well dry VI 08/08/96 857 Well dry g Vrojects\73942Smasterlwptiq I2020942gnv As Page 36 of 45