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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA
<br /> Casing Depth Groundwater LPH Concentration(µglL)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> RW4 05/02/91 923 3479 -25 56 000 16,000 34,000 4,200 22,000 110,000 --
<br /> 07/16-17191 35 69 -2646 000 12,000 31,000 2,700 14,000 110,000 --
<br /> 10/15/91 3622 -2699 000 13,000 28,000 3,100 15,000 120,000 --
<br /> 01/28/92 3439 -25 16 000 13,000 30,000 3,600 18,000 110,000 --
<br /> 04/30/92 3404 -2481 000 11,000 25,000 2,800 13,000 98,000 --
<br /> 08/13/92 36 18 -2695 000 8,500 24,000 2,500 13,000 120,000 --
<br /> 10/08/92 3678 -2755 000 6,000 17,000 1,700 10,000 95,000 --
<br /> 02/23/93 33 32 -24 09 000 7,000 16,000 3,000 14,000 88,000 --
<br /> 05/18/93 31 84 -2261 000 5,700 18,000 2,600 4,100 57,000 --
<br /> 08/22/93 3220 -2297 000 -- -- -- -- _-
<br /> 12/30/93 3133 -22 10 000 5,200 23,000 3,500 16,000 88,000 --
<br /> 02/17/94 3080 -2157 000 -- -- -- -- --
<br /> 05/10/94 3023 -2100 000 2,400 15,000 2,300 9,700 70,000 --
<br /> 08/02/94 3179 -2256 000 4,100 26,000 4,000 18,000 100,000 --
<br /> 11/01/94 3227 -23 04 000 2,700 17,000 2,300 11,000 69,000 --
<br /> 02/17/95 2970 -2047 000 1,000 9,100 1,900 7,600 45,000 --
<br /> 05/11/95 2696 -1773 000 1,400 11,000 1,600 7,400 59,000 --
<br /> 08/24/95 2800 -1877 000 590 4,500 970 3,700 17,000 --
<br /> 10/19/95 2839 -19 16 000 510 3,100 950 2,700 17,000 310
<br /> 02/13/96 2623 -1700 000 2,200 13,000 2,200 9,700 78,000 --
<br /> 04/18/96 23 76 -1453 000 1,900 9,200 2,100 8,400 62,000 <500
<br /> 08/08/96 2491 -15 68 000 730 2,500 970 2,900 15,000 <125
<br /> 11/04/96 25 28 -1605 000 1,600 5,200 1,300 4,900 36,000 <250
<br /> 02/03/97 2140 -12 17 000 1,700 6,500 1,900 7,200 42,000 1,300
<br /> 05/08/97 7 86 2005 -12 19 000 540 1,500 720 2,200 16,000 56
<br /> 08/26/97 21 51 -1365 000 98 180 140 340 2,600 56
<br /> 11/11/97 22 12 -1426 000 260 350 320 570 4,100 98
<br /> 03/03/98 16 85 -899 000 1,500 4,600 2,100 6,000 38,000 1,100
<br /> 03/03/98 <67*
<br /> 05/20/98 16 11 -825 000 450 460 600 890 7,400 400
<br /> 05120198 <6 7*
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