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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE P2 12/30/93 7 87 2729 -1942 000 160 45 180 105 42,000 -- 02/17/94 2697 -1910 000 57 28 17 14 270 -- 05/I0/94 26 63 -1876 000 24 <0 5 92 69 I,500 -- 08/02/94 2808 -2021 000 35 50 96 82 1,800 -- 11/01/94 2843 -2056 000 18 <0 5 76 66 1,400 -- 02/17/95 2571 -1784 000 -- -- -_ -_ _- 05/11/95 2300 -15 13 000 20 <5 0 58 40 1,400 -- 08/24/95 2442 -1655 000 62 <2 5 70 42 1,400 -- 10/19/95 2498 -17 11 000 5 3 <2 0 65 34 1,100 <10 02/13/96 2276 -1489 000 63 <2 5 77 43 1,700 -- 04/18/96 2057 -1270 000 55 <2 5 74 39 1,600 <12 08/08/96 2171 -13 84 000 -- -- -- -- -- 11/04/96 2230 -1443 000 <5 0 <5 0 51 16 11500 <25 02/03/97 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 1896 -12 17 000 17 <2 0 25 2 6 1,500 11 11/11/97 1950 -1271 000 25 <5 0 25 <5 0 1,300 <25 03/03/98 1406 -727 000 17 <5 0 27 <5 0 1,400 <25 03/03/98 <2 0* 05/20/98 1398 -7 19 000 8 2 <2 0 18 2 0 980 <10 05/20/98 <2 0* 08/19/98 1523 -844 000 7 2 <2 5 8 6 <2 5 850 <12 08/19/98 <2 0* 11/18/98 1575 -896 000 20 <5 0 10 <5 0 1,100 <25 03/30/99 14 07 -7 28 000 <0 5 <0 5 5 81 <0 5 950 <2 0 05/05/99 1430 -751 000 <0 5 <0 5 836 <0 5 688 2 81 08/20/99 1597 -9 18 000 959 1 97 3 89 1 30 489 252 12/06/99 -- -- -- -- -- -- -- -- -- 02/29/00 -- -- -- -- -- -- -- -- -- 05/16/00 -- -- 09/11/00 f 1pi o7eLtsV 39d21masterlw p1g900Y39426w x]s Pabe 22 of 37