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<br /> TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 N PERSHING AVENUE, STOCKTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH Concentration(µg/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (ft msl) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> P2 11/18/98 679 15 75 -896 000 20 <5 0 10 <5 0 1,100 <25
<br /> 03/30/99 14 07 -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 1 97 3 89 1 30 489 25 2
<br /> 12/06/99 -- -- --
<br /> 02/29/00 -- -- -- -- --
<br /> 05/16/00 -- -- -- -- -- -- --
<br /> RWl 05/22/90 905 3074 -2169 000 2,000 7,500 2,000 9,800 58,000 -
<br /> 09/25/90 3237 -2332 000 7,100 16,000 2,000 9,200 72,000 -
<br /> 12/19/90 3229 -2324 000 9,000 20,000 2,300 11,000 73,000 -
<br /> 01/30/91 3267 -2362 000 4,400 13,000 1,700 8,400 57,000 -
<br /> 05/02/91 32 63 -2358 000 5,700 17,000 2,700 12,000 67,000 -
<br /> 07/16-17/91 33 59 -24 54 000 5,100 17,000 1,700 8,100 61,000 -
<br /> 10/15/91 3402 -24 97 000 7,000 21,000 2,600 12,000 93,000 -
<br /> 01/28/92 3236 -2331 000 5,500 18,000 2,500 10,000 66,000 -
<br /> 04/30/92 -- -- --
<br /> 08/13/92 33 93 -2488 000 4,700 19,000 2,500 12,000 92,000
<br /> 10/08/92 3448 -2543 000 1,200 8,400 1,500 6,600 52,000 -
<br /> 02/23/93 3169 -2264 000 1,800 4,100 1,000 3,900 26,000 --
<br /> 05/18/93 2974 -2069 000 1,900 7,800 1,300 5,000 36,000 --
<br /> 08/22/93 3003 -2098 000 1,800 7,600 1,500 5,800 39,000 --
<br /> 12/30/93 2938 -2033 000 1,600 2,400 1,300 3,700 20,000 --
<br /> 02/17/94 2897 -1992 000 1,000 4,000 1,100 3,600 26,000 --
<br /> 05/10/94 2853 -1948 000 1,200 5,300 1,400 5,000 34,000 -
<br /> 08/02/94 2995 -2090 000 1,300 4,700 1,400 4,800 28,000 -
<br /> 11/01/94 3034 -2129 000 1,100 4,600 1,300 4,600 28,000 -
<br /> 02/17/95 2782 -1877 000 820 3,600 1,200 3,900 24,000 -
<br /> 05/11/95 25 13 -1608 000 780 4,000 1,300 4,300 32,000 --
<br /> 08124/95 2641 -1736 000 820 4,000 I,500 4,600 24,000 -
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