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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- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW 1 12/19/89 776 2922 -2146 000 <0 5 19 <0 5 <0 5 <250 -- MW1 03/21/90 776 2746 -1970 000 <0 5 <0 5 08 2 9 80 -- MW1 05/17/90 7 76 2824 -2048 000 <0 5 4 5 <0 5 <0 5 120 -- MW1 09/25/90 776 2959 -2183 000 <0 5 7 0 10 4 7 170 -- MW 1 12/19/90 776 Dry _- -- __ __ __ MW i 41/30/91 776 Dry MW 1 05/02/91 7 76 Dry MW i 07116-17191 776 Dry MW 1 10/15/91 776 2995 -22 19 a 000 MW1 01/28/92 776 2970 -2194 a 0 00 MW1 04/30/92 776 2926 -21 50 0 00 MW 1 08/13/92 776 2985 -2209 000 MW1 10/08/92 7 76 Dry MW I 02/23/93 776 2855 -2079 000 -- -- -. __ MW l 05/18/93 776 27 12 -1936 000 19 <0 5 28 1 8 950 -- MW1 08/22/93 776 2734 -1958 000 89 <0 5 <0 5 <0 5 710 -- MWl 12/30/93 776 2678 -1902 000 12 <0 5 19 7 7 390 -- MW I 02/17/94 776 2647 -18 7t 000 <0 5 1 3 <0 5 <0 5 130 -- MW l 05/10/94 776 26 12 -1836 000 <0 5 1 3 0 6 0 6 510 -- MW1 08/02/94 776 2759 49 83 000 <0 5 3 5 1 7 5 2 780 M W 1 11/01/94 776 2794 -20 18 000 <0 5 <0 5 1 0 2 0 400 MW I 02/17/95 776 2535 -1759 000 <0 5 0 98 1 1 1 1 480 -- MW I 05/11/95 776 2272 -1496 000 <0 5 <0 5 <0 5 <0 5 130 -- M W I 08/24/95 776 2403 -1627 000 <0 5 <0 5 <0 5 <0 5 140 -- MW l 10/19/95 776 2461 -16 85 000 <0 5 <0 5 <0 5 <0 5 210 <2 5 MW1 02/13/96 776 2243 -14 67 0 00 <0 5 <0 5 <0 5 <0 5 190 -- MW 1 04/18/96 776 2004 -1228 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 MW 1 08/08/96 776 2132 -13 56 000 -- -- -- -- -- M W i 11/04/96 776 2177 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 M W 1 02/03/97 776 1700 -924 000 <0 5 <0 5 <0 5 <0 5 82b <2 5 MW 1 05/08/97 643 1680 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW I 08/26/97 6 43 1858 -12 15 000 -- -- -_ __ G 1Projects1739421MASTERIWP1WP0303U942gw xis Page 3 of45