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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( ) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW 12 09/10/02 775 Not Accessible _- M W 12 12/18/02 7 75 Not Accessible -- -- -- -_ -- MW13 05/18/93 949 33 75 -2426 000 1 1 <0 5 <0 5 <1 71 MW13 08/22/93 949 35 05 -2556 000 <0 5 <0 5 <0 5 <0 5 <50 MW13 12/30/93 949 3329 -23 80 000 <0 5 <0 5 <0 5 <0 5 <50 MW13 02/17/94 9 49 3273 -2324 000 2 3 <0 5 <0 5 0 5 <50 MW13 05/10/94 949 32 00 -2251 000 1 1 <0 5 <0 5 <0 5 110 MW13 08/02/94 949 3330 -23 81 000 13 6 8 5 9 35 620 MW13 11/01/94 949 3397 -2448 000 <0 5 <0 5 <0 5 <0 5 <50 MW13 02/17/95 949 3176 -2227 000 <0 5 <0 5 <0 5 <0 5 <50 MW13 05/11195 949 2890 -1941 000 <0 5 <0 5 <0 5 <0 5 <50 MW13 08/24/95 949 2958 -2009 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW13 10/19/95 949 2997 -2048 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW13 02/13/96 949 2785 -1836 000 <0 5 <0 5 <0 5 <0 5 <50 -- MW13 04/18/96 949 2527 -15 78 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW13 08/08/96 949 2600 -1651 000 -- -- -- -- _- -- MW13 11/04/96 949 2636 -16 87 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW13 02/03/97 949 2220 -12 71 000 -- -- -- __ __ -- MW13 05/08/97 808 2087 -12 79 0 00 MW 13 08/26/97 809 2269 -1461 000 -- -- -- -- -_ -- MW13 11/11/97 808 2320 -1512 000 <05 <05 <05 <05 <50 <25 MW i 3 03/03/98 808 1809 -1001 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW 13 03/03/98 808 <2 0* MW13 05/20/98 808 1698 -890 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW13 05/20/98 808 <2 0* MW13 08/19/98 808 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 18 82 -1074 000 -- -- __ __ _- _- MW13 03/30/99 808 1688 -880 000 -- -- -- -- -- MW13 -MW13 05105199 808 1709 -9 01 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW13 08/20/99 808 1872 -1064 000 -- -- -- _- __ -- G Trajem%73942WAS"I FMWNWPO3U3942gw x1s Page 23 of45 I