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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- - No Date (feet ms1) (feet) _ (feet msl) (feet) Benzene Toluene benzene Xylenes _ TPH-g MTBE MW3 11/04/96 9 14 2405 -1491 000 __ __ -- __ 02/03/97 9 14 19 63 -1049 000 180 4 6 48 110 1,400 24 05/08/97 854 1942 -1088 000 -- -- __ -- 08/26/97 854 2120 -1266 000 11/11/97 854 Well dry -- __ __ __ __ -- 03/03/98 854 1616 -7 62 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/03/98 854 <2 0* 05/20/98 854 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 05/20/98 854 <2 0* 08/19/98 854 1748 -894 000 5 9 2 2 <0 5 0 63 280 2 6 08/19/98 854 <2 0* 11/18/98 854 1793 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/30/99 854 -- -- -_ __ -- 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 08/20/99 854 1785 -931 000 -- -- _- __ __ 12/06/99 854 1802 -948 000 02/29/00 854 1567 -7 13 000 05/16/00 854 1562 -708 000 -- __ __ __ __ 09/11/00 854 1798 -944 000 7 3 84 59 11 5 220 <0 5 12/13/00 854 1760 -906 000 3 4 11 18 8 3 90 <0 5 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 06/21/01 854 1842 -9 88 000 <0 5 <0 5 <0 5 <0 5 160 2 9 06/21/01 854 <5* MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- 04/11/88 8 13 2123 -13 10 000 510 <25 490 1,100 8,500 -- 09/13/88 8 13 23 66 -1553 000 860 40 670 2,400 5,600 -- 11/16/88 8 13 2381 -1568 000 860 340 810 1,000 8,000 -- 02/09/89 8 13 2355 -1542 000 630 20 530 650 4,800 -- 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -- 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- 03121/90 8 13 2806 -1993 000 400 6 8 340 160 3,200 -- %projects1739421masterlwp\g60E13942gw xls Page 6 of 37