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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 (pglL) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW9 01/30/91 788 Dry <br /> 05/02/91 2945 -2157 000 <br /> 07116-17191 2960 -2172 a 000 <br /> 10/15/91 Dry -- -- __ -- -- -- <br /> 01/28/92 Dry -- -- -- -- -- -- <br /> 04/30/92 2907 -21 19 000 -- -- -- -- -- -- <br /> 08/13/92 2947 -2159 000 -- -- -- -- -- -- <br /> 10/08/92 Dry -- -- -- -- -- <br /> 02/23/93 2836 -2048 000 -- -- -- -- -- <br /> 05/18/93 -- -- -- -- -- -- -- <br /> 08/22/93 Not accessible -- -- -- -- -- <br /> 12/30/93 Not accessible -- -- -- -- -- __ <br /> 02/17/94 Not accessible -- -- -- -- -- <br /> 05/10/94 26 15 -1827 000 3,100 29 52 89 7,400 -- <br /> 08/02/94 2765 -1977 000 4,900 230 120 490 13,000 -- <br /> 11/01/94 2797 -2009 000 4,300 270 170 700 12,000 -- <br /> 02/17/95 2538 -1750 000 2,200 89 100 410 7,100 -- <br /> 05/11/95 2396 -1608 000 2,500 68 110 490 8,300 -- <br /> 08/24/95 2439 -1651 000 490 6 0 38 110 1,200 -- <br /> 10/19/95 2485 -1697 000 840 120 100 320 4,900 79 <br /> 02/13/96 2255 -1467 000 890 <10 110 220 4,400 -- <br /> 04/18/96 2035 -1247 000 780 220 110 460 5,700 <125 <br /> 08/08/96 2156 -13 68 000 510 <10 88 260 2,700 230 <br /> 11/04/96 2194 -1406 000 370 <10 24 26 1,700 160 <br /> 02/03/97 1751 -963 000 320 16 56 160 1,600 230 <br /> 05/08/97 6 57 1725 -1068 000 310 <5 0 39 57 2,600 250 <br /> 08126/97 1905 -1248 000 64 <2 0 <2 0 <2 0 1,100 150 <br /> f 1prujects1739421master\wplq 12=3942gw xls Page 16 of 43 <br />