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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH Concentration(ag/L) _
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> V2 10/08/92 930 3457 -2526 002 Not sampled-LPH
<br /> 02/23/93 930 31 37 -22 07 000
<br /> 05/18/93 930 -- -- -_ __
<br /> 08/22/93 930 3016 -2086 000 27,000 46,000 3,500 17,000 180,000 --
<br /> 12/30/93 930 2976 -2046 000 27,000 35,000 4,200 22,000 170,000 --
<br /> 02/17/94 930 2933 -2003 000 -- -- __
<br /> 05/10/94 930 28 95 -1965 000 24,000 49,000 4,900 24,000 220,000 --
<br /> 08/02/94 930 3029 -2099 000 21,000 43,000 3,700 20,000 160,000 --
<br /> 11/01/94 930 3064 -2134 000 23,000 46,000 4,100 22,000 200,000 --
<br /> 02/17/95 930 2823 -1893 000 -- __ __ -- __
<br /> 05/11/95 930 24 95 -1565 000
<br /> 08/24/95 930 -- -- -- -- --
<br /> 10/19/95 930 2685 -1755 000 12,000 30,000 3,600 17,000 170,000 <2,500
<br /> 02/13/96 930 24 60 -1530 Sheen -- -- -- __ -- --
<br /> 04/18/96 9 30 22 60 -1330 Sheen
<br /> 08/08/96 930 2390 -1460 Sheen -- _- __ -_ __ --
<br /> 11/04/96 930 2473 -1543 000 13,000 31,000 2,500 13,000 130,000 <2,500
<br /> 02/03/97 930 1970 -1040 Sheen -- -- _- __ __ --
<br /> 05/08/97 8 15 1920 -1105 000 11,000 29,000 2,900 14,000 170,000 <1,250
<br /> 08/26/97 8 15 2074 -1259 000 9,900 45,000 7,300 40,000 270,000 <500
<br /> 11/11/97 8 15 2157 -1342 000 12,000 34,000 4,500 22,000 160,000 3,500
<br /> 03/03/98 8 15 1595 -7 80 000 11,000 30,000 3,500 17,000 150,000 <2,500
<br /> 03/03/98 8 15 <200*
<br /> 05/20/98 8 15 15 63 -748 000 6,700 22,000 2,500 12,000 100,000 <1,000
<br /> 05/20/98 815 <100*
<br /> 08/19/98 8 15 1723 -9 08 000 3,300 16,000 16,000 7,900 46,000 <500
<br /> 08/19/98 815 <100*
<br /> 11/18/98 8 15 17 67 -952 000 5,700 21,000 2,600 13,000 86,000 <625
<br /> 03/30/99 8 15 15 76 -7 61 000 4,830 17,900 2,800 13,300 77,900 <400
<br /> 05/05/99 8 15 16 12 -797 000 4,590 16,700 2,030 12,300 67,800 <200
<br /> 08/20/99 8 15 1755 -940 000 1,400 4,440 517 2,630 20,500 616
<br /> 12/06/99 815 -- -- -- --
<br /> 02/29100 8 15 -- -- -- -- -- -- --
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