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i � � � 1• � � � � � 1� � � >� 1• fid t• � � J• TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE V4 08/24/95 938 -- -- V4 10/19/95 938 26 85 -1747 Sheen -- -- -- -- -- __ V4 02/13/96 938 2474 -1536 Sheen V4 04/18/96 938 2236 -1298 Sheen -- -- -- -- __ V4 08/08/96 938 2360 -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 20 80 -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 1562 -735 007 V4 08/19/98 822 17 19 -887 0 13 V4 11/18/98 822 1753 -924 009 V4 03/30/99 822 -- __ __ V4 05/05/99 822 1595 -7 72 0 01 -- -- -- -- __ -- V4 08/20/99 822 1761 -939 000 637 5 14 145 537 190 12 6 V4 12/06/99 822 17 85 -956 010 -- -- __ -_ __ -- V4 02/29/00 822 1525 -699 006 V4 05/16/00 822 1526 -7 01 0 04 V4 09/11/00 822 1759 -933 005 V4 12/13/00 822 1745 -923 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 -974 002 -- -- -- __ __ -- V4 09/20/01 822 1928 -1105 001 V4 12/04/01 812 1906 -1094 000 -- -- -- -- __ _- V4 03/05/02 812 1690 -8 78 000 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* g IprojectsV39421masterlwp1g074413942gw As Page 52 of 54