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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration( ) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> V4 08/08/96 9 38 2360 -1422 Sheen <br /> V4 11/04/96 938 2402 -14 64 000 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 -1104 Sheen <br /> V4 08/26/97 822 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 -735 0 07 <br /> V4 0811919$ 822 17 19 -887 0 13 <br /> V4 11/18/98 822 1753 -924 0 09 <br /> V4 03/30/99 822 <br /> V4 05/05/99 822 1595 -772 0 01 <br /> V4 08/20/99 822 1761 -939 000 63 7 5 14 14 5 537 190 12 6 <br /> V4 12/06/99 8 22 17 85 -956 0 10 <br /> V4 02/29/00 822 1525 -699 006 <br /> V4 05/16/00 822 1526 -7 01 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 0 00 680 36,000 7,700 117,000 320,000 <250 <br /> V4 06/21/01 822 1797 -974 0 02 -- -- -- -- __ _ <br /> V4 09/20/01 922 1928 -1105 0 01 <br /> V4 12/04/01 8 12 19 06 -1094 0 00 <br /> V4 03/05/02 8 12 1690 -8 78 000 4,480 17,200 2,800 14,100 60,600 h <25 <br /> V4 06/11/02 8 12 18 51 -1039 0 00 900 19,600 3,420 15,700 99,400 h 100 <br /> V4 06/11/02 812 <50* <br /> V4 09/10/02 8 12 1975 -1163 Sheen 890 11,000 3,510 16,600 106,000 h <50 <br /> V4 12/18/02 8 12 1948 -1136 0 00 840 22,900 3,280 16,500 96,200 h 520 <br /> V4 12/18/02 812 <100* <br /> UVB-MW I 02/28/97 742 1867 -- 000 7,200 18,000 2,000 11,000 99,000 1,100 <br /> UVB-MW I 05/08/97 742 1876 -1134 000 5,900 15,000 1,800 9,000 86,000 1,600 <br /> UVB-M W I 05/08/97 742 <200* <br /> Q 1Projects1739421MASTERIWP1WP030313942gw als Page 42 of 45 <br />