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TABLE 2 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- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW13 05/20/98 8 08 <2 0* MW13 08/19/98 8 08 18 38 -1030 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW13 08/19/98 808 <2 0* MW13 11/18/98 808 1882 -1074 000 -- -- -- MW13 MW13 03/30/99 808 1688 -880 000 -- -- -- MW13 _MW13 05/05/99 808 1709 -901 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW13 08/20/99 808 1872 -1064 000 -- -- -- MW13 _MW13 12/06/99 808 19 10 -1102 000 -- -- -- MW B 02/29/00 808 1682 -874 000 <1 <1 <1 <1 <50 <1 MW13 05/16/00 808 16 18 -8 10 0 00 -- -- -- MW13 -MW13 09/11/00 808 1868 -1060 000 -- -- -- MW13 -MW13 12/13/00 808 1859 -1051 000 <0 5 <0 5 <0 5 063 <50 <0 5 MW13 03/08/01 808 1788 -980 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW13 06/21/01 808 1928 -1120 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 MW13 09/20/01 808 2057 -1249 000 -- __ -- MW13 _MW13 12/04/01 808 2039 -1231 000 _- _- -- MW 13 03/06/02 808 1940 -1132 000 <0 5 220 11 5 300 801 h <0 5 MW13 06111/02 808 -- -- MW13 -MW13 09/10/02 808 2I 40 -1332 000 MW13 12/18/02 808 21 12 -1304 000 MW13 03/24/03 808 2043 -1235 000 -- -_ -- MW13 -MW13 03/25/03 8 08 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW13 06111/03 808 2066 -1258 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 i Pi 01/30/91 779 3024 -2245 000 -- _- -_ P1 05/02/91 779 30 13 -2234 000 340 5 430 520 3,700 Pi 07/16-17191 779 3109 -2330 000 160 <2 5 160 240 3,000 P1 10/15/91 779 3168 -2389 000 69 3 4 63 73 1,300 -- P1 01/28/92 779 2993 -22 14 000 110 26 270 330 2,000 -- P1 04/30/92 779 2956 -2177 000 120 <10 540 600 4,700 -- Q1 08113/92 779 3157 -2378 000 72 4 5 260 260 2,900 P1 10/08/92 779 32 17 -2438 000 18 2 8 52 45 1,100 P1 02/23/93 779 2882 -2103 000 66 1 8 200 200 2,300 -- g 1projects1739421masterlwp%go6o3\3942bryv x!s Page 25 of 48