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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 Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V3 06/11/02 761 <2 5* V3 09/10/02 761 1998 -1237 000 <50 260 970 3,790 14,100 h 700 V3 09/10/02 761 <50* V4 05/02/91 938 32 10 -2268 005 31,000 58,000 5,700 29,000 200,000 V4 07116-17191 938 33 06 -23 65 004 Not sampled-LPH V4 10/15/91 938 3374 -2434 003 Not sampled-LPH V4 01/28/92 938 3192 -2254 Sheen 23,000 63,000 5,300 27,000 220,000 -- V4 04/30/92 938 3148 -22 09 001 Not sampled-LPH V4 08/13/92 938 3360 -24 17 007 Not sampled-LPH V4 10/08/92 938 3420 -2473 0 12 Not sampled-LPH V4 02/23/93 938 3085 -2147 000 15,000 35,000 4,300 23,000 150,000 V4 05/18/93 938 2935 -1997 000 13,000 47,000 5,900 28,000 240,000 V4 08/22/93 938 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 V4 12/30/93 938 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 02/17/94 938 2889 -1951 000 -- __ V4 05/10/94 938 2854 -19 16 002 Not sampled-LPH V4 08/02/94 938 2993 -20 55 002 Not sampled-LPH V4 11/01/94 938 3034 -2096 000 -- V4 02/17/95 938 27 82 -1844 000 -- - -- V4 05/11/95 938 25 12 -1574 Sheen V4 08/24/95 938 -- __ -- V4 10/19/95 938 26 85 -1747 Sheen V4 02/13/96 9 38 2474 -1536 Sheen -- - V4 04/18/96 938 2236 -1298 Sheen V4 08/08/96 938 2360 -1422 Sheen -- V4 11/04/96 938 24 02 -1464 000 3,200 24,000 2,900 16,000 120,000 <1,250 V4 02/03/97 938 1940 -1002 Sheen -- __ __ _ V4 05/08/97 822 1926 -1104 Sheen V4 08/26/97 822 2080 -1247 0 15 -- V4 11/11/97 822 2134 -13 12 Sheen -- - -- V4 03/03/98 822 1567 -744 001 -- V4 05/20/98 822 15 62 -735 0 07 -- V4 08/19/98 822 17 19 -887 0 13 g 1pro2ects1739421masteAwp1g090213942gw As Page 38 of 4l