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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 117 W 1 01187 7 76 -- -- <1 <1 __ <1 <50 NI\VI 07/16/87 776 -- -- -- <0 5 1 5 <0 5 <0 50 <100 -- NII W 1 04/11/88 776 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 -- A 1 W 1 09/13/88 776 22 18 -1442 000 19 2 5 <0 5 <0 5 70 -- NI W 1 11/16/88 776 2307 -1531 0 00 <0 5 9 5 <0 5 <0 5 130 -- NIW 1 02/09/89 776 2264 -14 88 000 17 0 2 0 2 0 6 <250 -- NII W 1 05/31189 7 76 2926 -2150 000 <0 5 <0 5 <0 5 08 <250 -- ltlW 1 08/17/89 776 25 87 -18 11 000 <0 5 <0 5 <0 5 <0 5 <250 -- M W I 12/19/89 776 2922 -2146 000 <0 5 1 9 <0 5 <0 5 <250 MWI 03/21/90 776 2746 -1970 000 <0 5 <0 5 0 8 2 9 80 -- NIW I 05/17/90 776 2824 -2048 000 <0 5 4 5 <0 5 <0 5 120 MWI 09/25/90 776 2959 -2183 000 <0 5 7 0 10 4 7 170 MWI 12/19/90 7 76 Dry __ -- __ A I W I 01/30/91 776 Dry MWI 05/02/91 776 Dry MWI 07/16-17/91 776 Dry MWI 10/15/91 776 2995 -22 19 a 0 00 MWI 01/28192 776 29 70 -2194 a 000 MW 1 04/30/92 776 2926 -21 50 000 Ivl1'V 1 08/13/92 776 2985 -2209 000 kiwi 10/08/92 776 Dry 11IW l 02/23/93 776 2855 -2079 000 -- -- -_ __ MW l 05/18/93 776 27 12 -1936 000 19 <0 5 2 8 1 8 950 MWI 08/22/93 776 2734 -1958 000 8 9 <0 5 <0 5 <0 5 710 -- M W I. 12/30/93 776 2678 -1902 000 12 <0 5 19 7 7 390 -- MW 1 02/17/94 776 2647 -1871 000 <0 5 1 3 <0 5 <0 5 130 -- NIW 1 05/10/94 776 26 12 -1836 000 <0 5 13 0 6 0 6 510 -- MW 1 08/02/94 776 2759 -19 83 0 00 <0 5 3 5 17 5 2 780 -- NIIW 1 11/01/94 776 2794 -2019 000 <0 5 <0 5 10 2 0 400 MWI 02/17/95 776 2535 -17 59 000 <0 5 098 1 1 1 1 480 -- N11��1 05/11/95 776 2272 -1496 000 <0 5 <0 5 <0 5 <0 5 130 -- g 1pro3ects\739421master%wplq 1203\3942gw xis Page 3 of 51