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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- MTBE V4 10/08/92 938 3420 -2473 0 12 Not sampled-LPH V4 02/23/93 938 3085 -2147 000 15,000 35,000 4,300 23,000 150,000 -- V4 05/18/93 938 2935 -19 97 000 13,000 47,000 5,900 28,000 240,000 -- V4 08/22/93 938 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 -- V4 12/30/93 938 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 V4 02/17/94 938 2889 -1951 000 -- -- -- -- "" V4 05/10/94 938 2854 -1916 002 Not sampled-LPH V4 08/02/94 938 2993 -2055 002 Not sampled-LPH V4 11/01/94 938 3034 -2096 000 -- V4 02/17/95 939 2782 -1844 000 -- -- -- -- -- V4 05/11/95 938 25 12 -1574 Sheen -- -- -- -- "- "- V4 08/24/95 938 V4 10/19/95 938 2685 -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 -10 02 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 15 67 -744 001 -- -- -- -- V4 05/20/98 822 1562 -7 35 007 -- -- "- -- -" V4 08/19/98 822 1719 -8 87 0 13 -- -- -- -- -- -- V4 11/18/98 822 1753 -9 24 009 -- -- V4 03/30/99 822 -- -- -- -- -- V4 05/05/99 822 15 95 -772 0 01 -- -- -- -- -- V4 08/20/99 822 1161 -939 000 63 7 5 14 145 537 190 126 V4 12/06/99 822 17 85 -956 0 10 -- -- -- -- '" -' V4 02/29/00 822 1525 -699 006 -- -- -- -- -` V4 05/16/00 822 1526 -7 01 004 -- -- -- -- -- -- V4 09/11/00 822 1759 -933 0 05 -- -- -- -- -" -- V4 12/13/00 822 1745 -9 23 Sheen -- -- -- -- -- -` Page 53 of 56 glprojects173942\rnasterlwplgl204U942gw xis