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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- - <br /> Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPII-g MTBE <br /> V4 04/18/96 938 2236 -1298 Sheen <br /> V4 08/08/96 938 2360 -1422 Sheen -- -- -- __ <br /> V4 11/04/96 938 2402 -1464 000 3,200 24,000 2,900 16,000 120,000 <1,250 <br /> V4 02/03/97 938 1940 -1002 Sheen -- -- -- -- <br /> V4 05/08/97 822 1926 -1 1 04 Sheen <br /> V4 08/26/97 8 22 2080 -1247 0 15 <br /> V4 11/11/97 822 21 34 -13 12 Sheen <br /> V4 03/03/98 822 1567 -744 0 01 <br /> V4 05/20/98 822 1562 -7 35 007 <br /> V4 08/19/98 822 1719 -887 0 13 <br /> V4 11/18/98 822 17 53 -924 009 <br /> V4 03/30/99 822 -- -- __ <br /> V4 05/05/99 822 1595 -772 001 -- -- -- __ -- <br /> V4 08/20/99 822 1761 -939 000 63 7 5 14 145 537 190 126 <br /> V4 12/06/99 822 1785 -956 010 -- -- __ -- _- <br /> V4 02/29/00 822 15 25 -6 99 006 <br /> V4 05/16/00 822 1526 -701 0 04 <br /> V4 09/11/00 822 1759 -933 0 05 <br /> V4 12/13/00 822 1745 -923 Sheen -- -- -- -_ __ _ <br /> V4 03/08/01 822 1662 -840 000 680 36,000 7,700 117,000 320,000 <250 <br /> V4 06/21/01 822 1797 -974 002 -- -- __ __ __ <br /> V4 09/20/01 822 1928 -1105 001 <br /> V4 12/04/01 8 12 1906 -1094 000 -- -- -_ __ __ <br /> V4 03/05/02 8 12 1690 -878 000 4,480 17,200 2,800 14,100 60,600 h <25 <br /> V4 06/11/02 812 1851 -1039 000 900 19,600 3,420 15,700 99,400 h 100 <br /> V4 06/11/02 812 <50* <br /> UVB-MW 1 02/28/97 742 1867 -- 000 7,200 18,000 2,000 11,000 99,000 1,100 <br /> UVB-MWI 05/08/97 742 18 76 -1134 000 5,900 15,000 1,800 9,000 86,000 1,600 <br /> UVB-MW 1 05/08/97 742 <200* <br /> UVB-MWl 08/26/97 d 742 2050 -1308 000 700 18 19 42 2,400 77 <br /> UVB-MW1 10/02197 742 -- -- -- 1,200 1,400 240 2,400 I7,000 300 <br /> g�projects1739421masterlN p%g060213942gw xis Page 40 of 43 <br />