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<br /> TABLE I 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 ms]) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> ,,MW9 08/19/98 657 44*
<br /> 11/18/98 1573 -916 000 <05 <05 <05 <05 310c 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 -9 12 000 -- -- -- -- -- --
<br /> 12/06/99 15 83 -926 000 -- -- -- -- -- --
<br /> 02/29/00 1333 -676 000 <1 <1 <1 <1 <50 4 8
<br /> 05/16/00 1339 -6 82 000 -- -- -- - -- --
<br /> mW10 04/11/88 8 61 23 18 -1457 000 640 130 170 140 3,100 --
<br /> 09/13/88 25 85 -1724 000 4,800 130 340 240 7,700 --
<br /> 11/16/88 2608 -1747 000 5,800 290 700 340 9,400 --
<br /> 02/09/89 2570 -1709 000 7,500 450 220 320 8,800 --
<br /> 05/31/89 2744 -1883 000 11,000 320 1,600 800 24,000 --
<br /> 08/17/89 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 --
<br /> 03/21/90 Not accessible -- -- -- -- --
<br /> 05/17/90 Not accessible -- -- -- -- --
<br /> 06/27/90 32 52 -2391 000 9,700 4,800 2,400 5,300 51,000 --
<br /> 09125190 33 95 -25 34 000 13,000 9,900 2,700 8,900 71,000 --
<br /> 12/19/90 33 79 -25 18 000 16,000 16,000 3,300 11,000 81,000 --
<br /> 01/30/91 3424 -25 63 000 18,000 15,000 2,600 9,900 62,000 --
<br /> 05/02/91 3424 -25 63 000 6,900 5,700 2,100 5,900 27,000 --
<br /> 07/16-17191 35 13 -26 52 a 000 -- -- -- -- -- --
<br /> 10/15/91 Dry -- -- -- -- --
<br /> 01/28/92 33 86 -25 25 000 -- -- -- -- -- --
<br /> 04/30/92 33 52 -24 91 000 -- -- -- -- -- --
<br /> 08/13/92 3500 -2639 000 -- -- -- -- -- --
<br /> 10/08/92 Dry -- -- -- -- --
<br /> 02/23/93 32 85 -2424 000 1,100 17,000 3,300 I5,000 91,000 --
<br /> 05/18/93 3132 -22 71 000 6,200 9,200 1,400 5,300 44,000 --
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