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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 (fig/L)
<br /> Well Elevation to Water Elevation Thickness Ethyl-
<br /> No Datefeet msl feet
<br /> ( ) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE
<br /> MW 10 10/15/91 861 Dry
<br /> 01/28/92 33 86 -25 25 000
<br /> 04/30/92 3352 -2491 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 15,000 91,000 --
<br /> 05/18/93 3132 -2271 000 6,200 9,200 1,400 5,300 44,000 --
<br /> 08/22/93 31 70 -23 09 000 7,800 15,000 1,700 7,900 66,000 --
<br /> 12/30/93 3079 -22 18 000
<br /> 02/17/94 3025 -2164 000 870 1,300 310 770 9,400 --
<br /> 05/10/94 2975 -21 12 000 1,400 3,800 470 1,700 21,000 --
<br /> 08/02/94 3133 -2272 000 510 130 150 400 5,700 --
<br /> 11/01/94 3176 -2315 000 4,100 16,000 1,600 7,500 64,000 --
<br /> 02/17/95 2929 -2068 000 1,300 4,400 780 2,500 21,000 --
<br /> 05/11/95 2646 -1785 000 360 750 230 480 6,300 --
<br /> 08/24/95 2758 -18 97 000 150 1,100 190 590 3,100 --
<br /> 10/19/95 2793 -1932 000 5 5 1 1 8 2 1 1 300 21
<br /> 02/13/96 25 67 -1706 000 1,600 15,000 1,400 6,500 64,000 --
<br /> 04/18/96 2320 -1459 000 1,100 8,900 1,100 4,400 42,000 <500
<br /> 08/08/96 2427 -1566 000 58 340 61 230 1,500 <50
<br /> 11/04/96 2451 -15 90 000 140 3,400 410 1,600 15,000 <250
<br /> 02/03/97 2024 -1163 000 1,500 18,000 2,100 9,500 66,000 1,800
<br /> 05/08/97 729 1928 -1199 000 40 51 64 110 1,300 38
<br /> 08/26/97 21 11 -13 82 000 2 1 14 3 7 <0 5 63 <2 5
<br /> 11/11/97 2162 -1433 000 18 060 0 84 <0 5 <50 3 1
<br /> 03/03/98 1630 -9 01 000 360 7,800 1,300 5,000 23,000 940
<br /> 03/03/98 <200*
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