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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 /> MW9 05/18/93 788 <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 25 38 -1750 000 2,200 89 100 410 7,100 -- <br /> 05/11/95 2396 -1608 0 00 2,500 68 110 490 8,300 -- <br /> 08/24/95 2439 -1651 0 00 490 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 21 56 -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 -9 63 000 320 16 56 160 1,600 230 <br /> 05/08/97 657 1725 -1068 000 310 <5 0 39 57 2,600 250 <br /> 08/26/97 1905 -1248 000 64 <2 0 <2 0 <2 0 1,100 150 <br /> 11/11/97 1947 -1290 000 31 <1 2 <1 2 <1 2 750 c 170 <br /> 11/11/97 180* <br /> 03/03/98 13 81 -724 000 22 <0 5 1 5 2 0 540 60 <br /> 03/03/98 68* <br /> 05/20/98 13 86 -729 000 3 5 <0 5 <0 5 <0 5 220e 22 <br /> 05/20/98 <br /> 20* <br /> 08/19/98 15 50 -893 000 0 81 6 8 <0 5 <0 5 340 45 <br /> 08/19/98 44* <br /> 11/18/98 1573 -9 16 000 <0 5 <0 5 <0 5 <0 5 310 c 18 <br /> 03/30/99 13 85 -728 000 _ <br /> 05/05/99 1423 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 <br /> 08/20/99 1569 -912 000 __ -- <br /> 12106199 15 83 -926 000 <br /> I 1pruiectsl779421niisler1up1g900139942gw als <br /> P46e 14 of 37 <br />