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<br /> TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA
<br /> Casing Depth Groundwater LPH Concentration /L
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (feet msl) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> V3 03/03/98 7 63 1693 -930 000 120 2,300 4,000 18,000 82,000 <250
<br /> 03/03/98 7 63 <200*
<br /> 05/20/98 763 1864 -1101
<br /> 000 88 1,200 2,900 14,000 44,000 730
<br /> 05/20/98 7 63 <100*
<br /> 08/19/98 763 1741 -978 000 <25 410 970 4,200 13,000 <125
<br /> 08/19/98 763 <67*
<br /> 11/18/98 763 17 11 -948 000 <25 680 1,800 7,000 20,000 <125
<br /> 03/30/99 7 63 15 95 -832 000 <25 781 2,180 8,630 37,500 <100
<br /> 05/05/99 7 63 15 95 -832 000 <10 389 1,040 4,500 14,400 77 4
<br /> 08/20/99 763 -- --
<br /> 12/06/99 763 -- -- -- -- -- -- -- --
<br /> 02/29/00 7 63
<br /> 05/16/00 7 63 -- -- -- __ --
<br /> 09/11/00 7 63 1760 -997 000 85 20 82 36 390 <0 5
<br /> 12/13/00 763 1745 -982 000 11 110 440 1,150 6,000 <2 5
<br /> 03/08/01 763 1670 -9 07 000 <25 640 2,100 8,900 40,000 <25
<br /> 06/21/01 763 1807 -1044 000 <0 5 3 1 20 346 1,500 30
<br /> 06/21/01 763 <5*
<br /> V4 05/02/91 938 32 10 -2268 0 05 31,000 58,000 5,700 29,000 200,000 --
<br /> 07/16-17/91 938 3306 -2365 0 04 Not sampled-LPH
<br /> 10/15/91 938 3374 -2434 0 03 Not sampled-LPH
<br /> 01/28/92 938 3192 -2254 Sheen 23,000 63,000 5,300 27,000 220,000 --
<br /> 04/30/92 938 3148 -2209 001 Not sampled-LPH
<br /> 08/13/92 938 33 60 -24 17 007 Not sampled-LPH
<br /> 10/08/92 938 3420 -2473 0 12 Not sampled-LPH
<br /> 02/23/93 938 3085 -2147 000 15,000 35,000 4,300 23,000 150,000 --
<br /> 05/18/93 9 38 2935 -1997 000 13,000 47,000 5,900 28,000 240,000 --
<br /> 08/22/93 938 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 --
<br /> 12/30/93 938 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 --
<br /> 02/17/94 938 28 89 -1951 000 -- -- -- __ __ -_
<br /> 05/10/94 938 2854 -19 16 002 Not sampled-LPH
<br /> 08102194 939 2993 -2055 002 Not sampled-LPH
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