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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration(µg/L) WeII Elevation to Water Elevation Thickness Ethyl- No Date (feet rnsl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW9 08/19/98 657 1550 -893 000 081 68 <0 5 <0 5 340 45 08/19/98 657 44* 11/18/98 657 1573 -916 000 <05 <05 <05 <05 310c 18 03/30/99 6 57 13 85 -728 000 -- -- __ __ __ 05/05/99 657 1423 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 08/20/99 657 1569 -9 12 000 -- -- -- _- -_ -- 12/06/99 657 15 83 -926 000 -- -- -- __ -- -- 02/29/00 657 1333 -676 000 <1 <1 <1 <1 <50 48 05/16/00 657 1339 -682 000 -- -- __ -_ -_ -- 09/11/00 657 -- -- __ 12/13/00 657 -- -- -- -- -- -- -- -- 03/08/01 657 1472 -8 15 000 <0 5 <0 5 <0 5 <0 5 <50 7 6 06/21/01 657 1614 -957 000 <05 <05 <05 <05 110 17 06/21/01 6 57 19* M W 10 04/11/88 8 61 23 18 -1457 000 640 130 170 140 3,100 -- 09/13/88 861 2585 -1724 000 4,800 130 340 240 7,700 -- 11/16/88 861 2608 -1747 000 5,800 290 700 340 9,400 -- 02/09/89 861 2570 -1709 000 7,500 450 220 320 8,800 -- 05/31/89 861 2744 -18 83 000 11,000 320 1,600 800 24,000 -- 08/17/89 861 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 -- 03/21/90 8 61 Not accessible -- -- -- -- __ 05/17/90 861 Not accessible -- -- -- -- -_ 06/27/90 8 61 32 52 -2391 000 9,700 4,800 2,400 5,300 51,000 -- 09/25/90 861 3395 -2534 000 13,000 9,900 2,700 8,900 71,000 -- 12/19/90 861 3379 -25 18 000 16,000 16,000 3,300 11,000 81,000 -- 01/30/91 861 3424 -25 63 000 18,000 15,000 2,600 9,900 62,000 -- 05/02/91 861 3424 -25 63 000 6,900 5,700 2,100 5,900 27,000 -- 07/16-17191 861 35 13 -26 52 a 000 -- -- -- -- -- 10/15/91 861 Dry -- -- -- -- -- -- 01/28/92 861 33 86 -2525 000 -- -- -- -- -- -- 04/30/92 8 61 3352 -2491 000 -- -- -- -- -- -- 08113/92 861 3500 -2639 000 -- -- -- -- -- -- �pro3ects1739421masterlwp1g611E13942gw x1s Page 15 of 37