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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(gg/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (ft ms]) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> MW8 09/25/90 7 78 29 17 -21 39 000 -- -- -- -- -- --
<br /> 12/19/90 29 13 -21 35 000 -- -- -- -- --
<br /> 01/30/91 Dry -- -- -- -- --
<br /> 05/02/91 2939 -21 61 000 830 5,900 4,900 23,000 57,000 --
<br /> 07/16-17191 2990 -22 12 a 000 -- -- -- -- --
<br /> 10/15/91
<br /> -10115/91 Dry -- -- -- -- -- --
<br /> 01/28/92 29 31 -21 53 000 -- -- -- -- -- --
<br /> 04/30/92 2884 -2106 a goo -- -- -- -- -- --
<br /> 08/13/92 2991 -22 13 a 000 -- -- -- -- -- --
<br /> 10/08/92 Dry -- -- -- -- --
<br /> 02/23/93 28 I3 -2035 000 1,100 5,400 3,300 11,000 49,000 --
<br /> 05/18/93 2671 -1893 000 850 5,800 3,400 13,000 53,000 --
<br /> 08/22/93 2695 -19 17 000 650 4,400 3,500 13,000 52,000 --
<br /> 12/30/93 2639 -1861 000 820 6,200 4,200 14,000 50,000 --
<br /> 02/17/94 26 10 -18 32 000 510 3,800 3,400 13,000 44,000 --
<br /> 05/10/94 25 83 -1805 000 520 4,200 3,800 13,000 49,000 --
<br /> 08/02/94 2729 -1951 000 290 1,900 1,900 7,500 28,000
<br /> 11/01/94 27 64 -1986 000 460 1,700 3,700 14,000 56,000 --
<br /> 02/17/95 2500 -1722 000 500 3,900 4,000 15,000 72,000 --
<br /> 05/11/95 2242 -1464 000 680 5,900 4,700 19,000 80,000 --
<br /> 08/24/95 23 77 -1599 000 520 4,700 4,800 17,000 65,000 --
<br /> 10/19/95 2437 -1659 000 150 1,400 2,400 8,600 52,000 <250
<br /> 02/13/96 22 15 -1437 000 190 2,100 2,600 10,000 57,000 --
<br /> 04/18/96 1980 -12 02 000 130 1,700 2,400 9,400 43,000 <125
<br /> 08/08/96 21 11 -13 33 000 200 2,700 3,300 13,000 46,000 <250
<br /> 11/04/96 21 55 -13 77 000 160 1,700 2,700 9,600 48,000 <250
<br /> 02/03/97 1678 -900 000 <100 1,400 2,500 9,900 42,000 <120
<br /> 05/08/97 645 1666 -1021 000 110 880 2,100 7,800 41,000 120
<br /> 08/26/97 1846 -1201 000 93 950 2,200 7,500 35,000 150
<br /> 11/11/97 I8 98 -12 53 000 <50 700 2,500 9,100 36,000 <250
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