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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 (pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> P2 08/24/95 7 87 2442 -1655 000 6 2 <2 5 70 42 1,400 -- <br /> 10/19/95 2498 -1711 000 5 3 <2 0 65 34 1,100 <10 <br /> 02/13/96 2276 -1489 000 63 <2 5 77 43 1,700 -- <br /> 04/18/96 2057 -1270 000 5 5 <2 5 74 39 1,600 <12 <br /> 08/08/96 2171 -13 84 000 <br /> 11/04/96 2230 -1443 000 <5 0 <5 0 51 16 1,500 <25 <br /> 02/03/97 1766 -979 000 <2 0 <2 0 52 17 1,500 13 <br /> 05/08/97 679 1724 -1045 000 18 <2 5 42 6 5 1,700 15 <br /> 08/26/97 1896 -12 17 000 17 <2 0 25 2 6 1,500 11 <br /> 11/11/97 1950 -1271 000 25 <5 0 25 <5 0 1,300 <25 <br /> 03/03/98 1406 -727 000 17 <5 0 27 <5 0 1,400 <25 <br /> 03/03/98 <2 0* <br /> 05/20/98 1398 -7 19 000 8 2 <2 0 18 2 0 980 <10 <br /> 05/20/98 <2 0* <br /> 08/19/98 1523 -844 000 7 2 <2 5 8 6 <2 5 850 <12 <br /> 08/19/98 <2 0* <br /> 11/18/98 1575 -896 000 20 <5 0 10 <5 0 1,100 <25 <br /> 03/30/99 1407 -728 000 <0 5 <0 5 5 81 <0 5 950 <2 0 <br /> 05/05/99 1430 -751 000 <0 5 <0 5 836 <0 5 688 2 81 <br /> 08/20/99 1597 -9 18 000 959 197 3 89 1 30 489 25 2 <br /> 12/06/99 -- -- -- -- -- -- -- -- <br /> 02/29/00 -- -- __ <br /> 05/16/00 - -- -- -- -- -- -- -- -- <br /> 09/11/00 -- -- -- -- -- -- -_ -- _- <br /> 12/13/00 -- <br /> RWI 05/22/90 9 05 3074 -2169 000 2,000 7,500 2,000 9,800 58,000 -- <br /> f�proaee s1739421mastenxplq]2000942gw As Page 26 of 43 <br />