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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 /L Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW10 05/16/00 729 1542 -8 13 000 09/11/00 729 1743 -1014 000 08 2 <0 5 1 97 50 <0 5 12/13/00 729 1729 -1000 000 <0 5 <0 5 <0 5 <0 5 62 <0 5 03/08/01 729 1654 -925 000 <0 5 <0 5 <0 5 <0 5 78 <0 5 06/21/01 729 1792 -1063 000 <0 5 <0 5 <0 5 <0 5 <50 12 06/21/01 729 <5* MWI 1 05/02/91 10 15 3839 -28 24 000 <0 3 <0 3 <0 3 <1 <50 -- 07/16-17/91 10 15 3938 -2923 000 <0 5 <0 5 <0 5 <0 5 <50 -- 10/15/91 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- 01/28/92 10 15 3808 -2793 000 <0 5 <0 5 <0 5 <0 5 <50 -- 04/30/92 10 15 3772 -2757 000 <0 5 <0 5 <0 5 <0 5 <50 -- 08/13/92 1015 3994 -2979 000 <0 5 <0 5 <0 5 <0 5 <50 -- 10/08/92 10 15 4070 -3055 000 <0 5 <0 5 <0 5 <0 5 <50 -- 02/23/93 10 15 3728 -27 13 000 <0 5 <0 5 <0 5 <0 5 <50 -- 05/18/93 1015 08/22/93 10 15 36 19 -2604 000 -- -- -- -- __ 12/30/93 10 15 Not accessible 11/11/97 1015 2483 -1468 000 <05 <05 <05 <05 <50 <25 11/11/97 10 15 <2 0* 03/03/98 10 15 20 11 -996 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/03/98 10 15 <2 0* 05/20/98 10 15 1858 -843 000 <0 5f <0 5f <0 5f <0 5f <50f <2 5f 05/20/98 1015 <2 0* 08/19/98 10 15 19 94 -9 79 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 08/19/98 10 15 <2 0* 11118198 10 15 2028 -10 13 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/30/99 10 15 1826 -8 11 000 -- -- -- -- -- -- 05/05/99 10 15 1848 -8 33 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 08/20/99 1015 -- -- -- -- -- -- 12/06/99 1015 2037 -1022 000 -- -- -- -- -- -- 02/29/00 10 15 1829 -8 14 000 <1 <1 <1 <1 <50 <1 05116/00 1015 1849 -834 000 -- -- -- -- -- -- 0 1protects1739321master�wpl460 i U942gw x1s Page 17 of 37