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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE V3 09/20/01 7 63 1925 -1162 000 98 18 46 132 950 <0 5 V3 12/04/01 761 1904 -1143 000 <50 260 960 4,200 19,000 <5* V3 03/05/02 761 1820 -1059 000 -- -- -- -- -- -- V3 03/06/02 7 61 -- -- -- 260 484 1,390 5,280 13,900 h 102 V3 03/06/02 7 61 <10* V3 06/11/02 7 61 1867 -1106 Sheen 720 117 548 2,000 8,300 h 100 V3 06/11/02 7 61 <2 5* V3 09/10/02 7 61 1998 -12 37 000 <50 260 970 3,790 14,100 h 700 V3 09/10/02 761 <50* V3 12/18/02 7 61 1971 -12 10 000 <50 380 1,310 5,260 17,000 h <50 V4 05/02/91 938 32 10 -2268 005 31,000 58,000 5,700 29,000 200,000 -- V4 07116-17191 938 3306 -2365 004 Not sampled-LPH V4 10/15/91 938 3374 -2434 003 Not sampled-LPH V4 01/28/92 939 3192 -2254 Sheen 23,000 63,000 5,300 27,000 220,000 -- V4 04/30/92 938 3148 -2209 0 01 Not sampled-LPH V4 08/13/92 938 3360 -2417 007 Not sampled-LPH V4 10/08/92 938 3420 -2473 0 12 Not sampled-LPH V4 02/23/93 9 38 30 85 -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 9 38 29 60 -2022 000 9,400 42,000 3,900 21,000 150,000 -- V4 12/30/93 9 38 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 -- V4 02/17/94 938 28 89 -1951 000 -- -- -- -- -- -- V4 05/10/94 938 2854 -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 9 38 2782 -1844 000 -- -- -- -- -- V4 05/11/95 938 25 12 -1574 Sheen V4 08/24/95 938 -- -- -- -- -- -- -- -- V4 10/19/95 9 38 2685 -1747 Sheen -- -- -- -- -- V4 02/13/96 938 2474 -15 36 Sheen -- -- -- -- -- -- V4 04/18/96 9 38 2236 -1298 Sheen -- -- -- -- -- -- G IPro3eccs%739421h7ASTERIWP1WP030313942g%k xis Page 41 of45