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<br /> TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH _ Concentration (µg/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 /> RW 1 02/17/94 9 05 2897 -1992 000 1,000 4,000 1,100 3,600 26,000 --
<br /> 05/10/94 905 2853 -1948 000 1,200 5,300 1,400 5,000 34,000 --
<br /> 08/02/94 905 2995 -2090 000 1,300 4,700 1,400 4,800 28,000 --
<br /> 11/01/94 905 3034 -2129 000 1,100 4,600 1,300 4,600 28,000 --
<br /> 02/17/95 905 27 82 -1877 000 820 3,600 1,200 3,900 24,000 --
<br /> 05/11/95 905 25 13 -1608 000 780 4,000 1,300 4,300 32,000 --
<br /> 08/24/95 905 2641 -1736 000 820 4,000 1,500 4,600 24,000 --
<br /> 10/19/95 905 2685 -1780 000 680 3,100 1,200 3,600 25,000 <250
<br /> 02/13/96 905 2270 -1365 000 590 2,900 920 2,700 21,000 --
<br /> 04/18/96 9 05 2229 -1324 000 510 2,500 980 2,700 23,000 <100
<br /> 08/08/96 905 2344 -1439 000 600 3,200 1,200 3,500 20,000 <250
<br /> 11/04/96 905 23 81 -1476 000 710 2,600 1,200 3,200 23,000 900
<br /> 02/03/97 905 1963 -1058 000 390 1,900 680 2,000 16,000 440
<br /> 05/08/97 770 1976 -1206 000 430 2,000 860 2,300 18,000 620
<br /> 08/26/97 770 2051 -1281 000 600 2,600 1,200 3,400 21,000 380
<br /> 11/11/97 770 21 11 -1341 000 410 1,500 750 1,800 13,000 520
<br /> 11/11/97 770 <25*
<br /> 03/03/98 770 1551 -781 000 320 1,300 660 1,700 11,000 420
<br /> 03/03/98 770 <33*
<br /> 05/20/98 770 15 30 -760 000 310 1,500 670 1,800 13,000 760
<br /> 05/20/98 770 <33*
<br /> 08/19/98 770 1675 -905 000 340 1,200 630 1,700 18,000 1,100
<br /> 08/19/98 770 <40*
<br /> 11/18/98 770 1721 -9 51 000 250 840 520 1,100 8,200 90
<br /> 03/30/99 770 1531 -7 61 000 197 678 432 967 8,150 <20
<br /> 05/05/99 770 1566 -796 000 234 833 499 1,270 8,680 58 4
<br /> 08/20/99 770 17 31 -9 61 000 234 415 409 728 6,450 315
<br /> o TjUJCL s1739421m ihLeA"P1y601 U942gw als Page 29 of 46
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