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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( 1L) Well Elevation to Water Elevation Thickness Ethyl- Numbe[ Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V3 03/08/01 763 1670 -907 000 <25 640 2,100 8,900 40,000 <25 V3 06/21/01 7 63 1807 -1044 000 <0 5 3 1 20 346 1,500 30 V3 06/21/01 7 63 e <5* V3 09/20/01 763 1925 -1162 000 98 18 46 132 950 <0 5 V3 12/0.1/01 761 1904 -1143 000 <50 260 960 4,200 19,000 <5* V4 05/02/91 938 32 10 -2268 0 05 31,000 58,000 5,700 29,000 200,000 -- V4 07/16-17/91 938 3306 -23 65 0 04 Not sampled-LPH V4 30/15/91 938 33 74 -2434 0 03 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 0 01 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 30 85 -2147 000 15,000 35,000 4,300 23,000 150,000 -- V4 05/18/93 9 38 2935 -1997 000 13,000 47,000 5,900 28,000 240,000 -- V4 08/22/93 9 38 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 -- V4 12/30/93 938 2926 -19 88 000 10,000 36,000 4,800 26,000 150,000 -- V4 02/17/94 938 2889 -1951 000 -- -- -- __ __ V4 05/10/94 938 28 54 -19 16 002 Not sampled-LPH V4 08/02/94 938 2993 -2055 002 Not sampled-LPH V4 11/01/94 938 3034 -2096 000 V4 02/17/95 938 2782 -1844 000 V4 05/11/95 938 25 12 -1574 Sheen V4 08/24/95 938 -- -- -- V4 10/19/95 938 2685 -1747 Sheen -- -- -- -- __ V4 02/13/96 938 2474 -15 36 Sheen V4 04/18/96 938 22 36 -1298 Sheen V4 08/08/96 938 2360 -1422 Sheen -- -- -- -_ __ -- V4 11/04/96 938 24 02 -14 64 000 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 -11 04 Sheen -- -- -- -- -- __ V 4 08/26197 822 2080 -1247 0 15 -- -- -- -- -- __ e`proici ts1739a2Ut345tei1�tplq[2il I U942g"xis Page 37 of 40