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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(ug/L) Well Elevation to Water Elevation Thickness Ethyl- No _ Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE P 1 06/21/01 643 -- -- -- P2 01/30/91 7 87 3022 -2235 000 -- -- -- -- __ 05/02/91 7 87 3013 -2226 000 140 13 650 610 5,400 -- 07/16-17191 7 87 31 05 -23 18 000 61 <5 300 220 5,200 -- 10/15/91 7 87 31 64 -2377 000 20 82 90 63 1,500 -- 01/28/92 787 2993 -22 06 000 53 24 170 120 2,900 -- 04/30/92 787 2951 -2164 000 52 <2 5 160 120 2,000 -- 08/13/92 7 87 3153 -2366 000 45 12 100 76 2,100 -- 10/08/92 787 32 17 -2430 000 34 20 60 80 2,000 -- 02/23/93 7 87 2879 -2092 000 58 3 0 44 34 1,000 -- 05/18/93 7 87 2739 -1952 000 65 20 81 58 1,400 -- 08/22/93 7 87 2763 -19 76 000 50 2 4 69 53 1,400 -- 12/30/93 7 87 2729 -1942 000 160 45 180 105 42,000 -- 02/17/94 7 87 2697 -19 10 000 5 7 2 8 17 14 270 -- 05/10/94 7 87 2663 -1876 000 24 <0 5 92 69 1,500 -- 08/02/94 7 87 2808 -2021 000 35 5 0 96 82 1,800 -- 11/01/94 7 87 2843 -2056 000 18 <0 5 76 66 1,400 -- 02/17/95 787 2571 -17 84 000 -- -- -- -- -- 05/11/95 787 23 00 -15 13 000 20 <5 0 58 40 1,400 -- 08/24/95 7 87 2442 -1655 000 6 2 <2 5 70 42 1,400 -- 10/19/95 7 87 2498 -17 11 000 5 3 <2 0 65 34 1,100 <10 02/13/96 7 87 2276 -14 89 000 6 3 <2 5 77 43 1,700 -- 04/18/96 787 2057 -1270 000 5 5 <2 5 74 39 1,600 <12 08/08/96 787 2171 -1384 000 -- -- -- -- -- -- 11/04/96 787 2230 -1443 000 <5 0 <5 0 51 16 1,500 <25 02/03/97 7 87 1766 -979 000 <2 0 <2 0 52 17 1,500 13 05/08/97 679 1724 -1045 000 18 <2 5 42 6 5 1,700 15 08/26/97 679 1896 -12 17 000 17 <2 0 25 2 6 1,500 11 11/11/97 679 19 50 -1271 000 25 <5 0 25 <5 0 1,300 <25 03/03/98 679 1406 -727 000 17 <5 0 27 <5 0 1,400 <25 03/03/98 679 <2 0* 05120198 679 1398 -7 19 000 8 2 <2 0 18 2 0 980 <10 o'projects173942trnasterl 4g60113942gw xls Page 22 of 37