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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(Ng/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (ft ms]) (ft) (ft msl) (ft) Benzene Toluene benzene Xylenes TAH-g MI BE
<br /> V3 10/15/91 899 3538 -2639 000 1,200 22,000 4,400 22,000 110000
<br /> -
<br /> 01/28/92 33 56 -2457 000 1,100 21,000 4,900 23,000 86,000 --
<br /> 04/30/92 33 15 -24 16 000 390 15,000 2,800 15,000 62,000 -
<br /> 08/13/92 35 32 -2633 000 620 17,000 4,800 23,000 110,000 -
<br /> 10/08/92 3596 -2697 000 430 11,000 3,200 17,000 100,000
<br /> 02/23/93 3255 -23 56 000 -- -- -- -- --
<br /> 05/18/93 -- -- -- -- -- -- -- - -
<br /> 08/22/93 3133 -2234 000 - -- -- - -
<br /> 12/30/93 3051 -2152 000 -- - -- -- -
<br /> 02/17/94 3008 -2109 000 -- -- -- -- -- -
<br /> 05/10/94 2955 -2056 000 -- - -- -- - -
<br /> 08/02/94 -- -- -- -- - -- -- -- --
<br /> 11/01/94 3152 -22 53 000 -- -- -- -- --
<br /> 02/17/95 2893 -1994 000 250 10,000 5,100 23,000 85 000 -
<br /> 05/11/95 26 19 -1720 000 110 7,200 4,100 19,000 70,000 -
<br /> 08/24/95 2734 -1835 000 <200 6,500 4,400 20,000 56,000 --
<br /> 10/19/95 2777 -1878 000 <100 5,200 3,600 16,000 69,000 <500
<br /> 02/13/96 25 39 -1640 000 370 4,900 3,500 16,000 76,000 1,900
<br /> 04/18/96 23 83 -14 84 000 <100 4,200 3,400 16,000 73,000 <500
<br /> 08/08/96 2444 -1545 000 <125 3,800 3,800 18,000 53,000 <625
<br /> 11/04/96 24 65 -1566 000 <100 3,500 3,700 17,000 73,000 <500
<br /> 02/03/97 2027 -1128 000 130 3,400 3,800 18,000 72,000 690
<br /> 05/08/97 763 1978 -12 15 000 <50 1,600 2,500 12,000 47,000 740
<br /> 08/26/97 2120 -13 57 000 53 1,200 2,100 9,000 36,000 260
<br /> 11/11/97 2262 -1499 000 140 1,600 3,000 13,000 48,000 690
<br /> 03/03/98 1693 -930 000 120 2,300 4,000 18,000 82,000 <250
<br /> 03/03/98 <200*
<br /> 05/20/98 18 64 -1101 000 88 1,200 2,900 14,000 44,000 730
<br /> 05/20/98 <100*
<br /> 08/19/98 1741 -9 78 000 <25 410 970 4,200 13,000 <I25
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