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s • � 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 V4 02/13/96 938 2474 45 36 Sheen V4 04/18/96 938 2236 -1298 Sheen V4 08/08/96 938 23 60 -1422 Sheen -- -- -- -- _- -- V4 11/04/96 938 2402 -1464 000 3,200 24,000 2,900 16,000 120,000 <1,250 V4 02/03/97 938 1940 -1002 Sheen -- -- __ __ __ -- V4 05/08/97 822 1926 -1104 Sheen V4 08/26/97 822 2080 -1247 0 15 -- -- -- -- -_ __ V4 11/11/97 822 2134 -13 12 Sheen V4 03/03/98 822 1567 -744 001 V4 05/20/98 822 l5 62 -735 007 V4 08/19/98 822 1719 -887 0 13 V4 11/18/98 822 1753 -924 009 V4 03/30/99 822 -- -- __ V4 05/05/99 822 1595 -772 001 -- -- __ __ __ -- V4 08/20/99 822 1761 -939 000 637 5 14 14 5 537 190 12 6 V4 12/06/99 822 17 85 -956 010 -- -- -- -- __ -- V4 02/29/00 822 15 25 -699 006 V4 05/16/00 822 1526 -701 004 V4 09/11/00 822 1759 -933 005 V4 12/13/00 822 1745 -9 23 Sheen -- -- -- -- -- -- V4 03/08/01 822 1662 -840 000 680 36,000 7,700 117,000 320,000 <250 V4 06/21/01 822 1797 -974 0 02 -- -- __ __ __ -- V4 09/20/01 822 1928 -1105 0 01 V4 12/04/01 8 12 19 06 -1094 000 -- -- -- -. __ -- V4 03/05/02 8 12 1690 -878 000 4,480 17,200 2,800 14,100 60,600 h <25 V4 06/11/02 8 12 1851 -1039 000 900 19,600 3,420 15,700 99,400 h 100 V4 06/11/02 812 <50* V4 09/10/02 8 12 1975 -1163 Sheen 890 11,000 3,510 16,600 106,000 h <50 V4 12/18/02 8 12 1948 -1136 000 840 22,900 3,280 16,500 96,200 h 520 V4 12/18/02 812 <100* V4 03/24/03 8 12 1890 -1078 000 -- -- -- __ __ -- V4 03/25/03 812 -- -- -- 700 2,300 3,390 17,100 102,000 h 130 V4 03/25/03 812 <10* g 5pro)ects173942Vmster\wp1g064513942gw xls Page 56 of 59