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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 ( /I
<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 /> MW 10 09/25/90 861 33 95 -2534 000 13,000 9,900 2,700 8,900 71,000 --
<br /> 12/19/90 861 33 79 -25 18 000 16,000 16,000 3,300 11,000 81,000 --
<br /> 01/30/91 861 3424 -25 63 000 18,000 15,000 2,600 9,900 62,000 --
<br /> 05/02/91 861 3424 -2563 000 6,900 5,700 2,100 5,900 27,000 --
<br /> 07/16-17/91 861 35 13 -26 52 a 000 -- -- __ _- _-
<br /> 10/15/91 861 Dry
<br /> 01/28/92 861 33 86 -2525 000
<br /> 04/30/92 861 33 52 -2491 000
<br /> 08/13/92 861 3500 -2639 000
<br /> 10/08/92 861 Dry -- -- -_ -- --
<br /> 02/23/93 8 61 3285 -24 24 000 1,100 17,000 3,300 15,000 91,000 --
<br /> 05/18/93 8 61 3132 -2271 000 6,200 9,200 1,400 5,300 44,000 --
<br /> 08/22/93 861 3170 -2309 000 7,800 15,000 1,700 7,900 66,000 --
<br /> 12/30/93 8 61 3079 -22 18 000 -- -- -- -_
<br /> 02/17/94 8 61 3025 -2164 000 870 1,300 310 770 9,400 --
<br /> 05/10/94 861 2975 -21 12 000 1,400 3,800 470 1,700 21,000 --
<br /> 08/02/94 861 3133 -2272 000 510 130 150 400 5,700 --
<br /> 11/01/94 861 3176 -23 15 000 4,100 16,000 1,600 7,500 64,000 --
<br /> 02/17/95 8 61 2929 -2068 000 1,300 4,400 780 2,500 21,000 --
<br /> 05/11/95 8 61 2646 -1785 000 360 750 230 480 6,300 --
<br /> 08/24/95 8 61 2758 -1897 000 150 1,100 190 590 3,100 --
<br /> 10/19/95 861 27 93 -1932 000 5 5 1 1 8 2 l 1 300 21
<br /> 02/13/96 861 2567 -1706 000 1,600 15,000 1,400 6,500 64,000 --
<br /> 04/18/96 861 2320 -1459 000 1,100 8,900 1,100 4,400 42,000 <500
<br /> 08/08/96 861 2427 -1566 000 58 340 61 230 1,500 <50
<br /> 11/04/96 861 2451 -1590 000 140 3,400 410 1,600 15,000 <250
<br /> 02/03/97 861 2024 -1163 000 1,500 18,000 2,100 9,500 66,000 1,800
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