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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(µgIL)
<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 /> RW3 05/22/90 8 89 3095 -2206
<br /> 000 16,000 41,000 5,500 31,000 160,000 --
<br /> 12/19/90 3302 -23 68 0 61 Not sampled- LPH
<br /> 01/30/91 3373 -24 12 098 Not sampled- LPH
<br /> 05/02/91 3275 -2347 054 Not sampled-LPH
<br /> 07116-17191 3372 -2449 047 Not sampled-LPH
<br /> 10/15/91 35 27 -25 58 1 10 Not sampled-LPH
<br /> 01/28/92 3269 -23 70 0 14 Not sampled- LPH
<br /> 04/30/92 3227 -2334 006 Not sampled-LPH
<br /> 08/13/92 3467 -25 50 039 Not sampled-LPH
<br /> 10/08/92 35 36 -2606 056 Not sampled-LPH
<br /> 02/23/93 31 34 -2245 000 4,100 4,300 1,600 8,300 47,000 --
<br /> 05/18/93 3002 -21 13 000 19,000 22,000 3,100 17,000 90,000 --
<br /> 08/22/93 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 --
<br /> 12/30/93 2963 -2074 000 18,000 22,000 2,900 15,000 96,000 --
<br /> 02/17/94 2927 -2038 000 9,600 14,000 2,200 9,600 70,000 --
<br /> 05/10/94 28 81 -1992 000 10,000 16,000 2,200 10,000 76,000 --
<br /> 08102194 3035 -2146 000
<br /> 11101/94 3059 -2170 000 11,000 16,000 2,800 14,000 92,000 --
<br /> 02/17/95 28 08 -19 19 000 9,800 12,000 2,600 11,000 79,000 --
<br /> 05/11/95 2537 -1648 000 7,600 10,000 2,700 12,000 90,000 --
<br /> 08/24/95 2672 -17 83 000 9,600 15,000 4,600 20,000 100,000 --
<br /> 10/19/95 2705 -18 16 000 7,000 12,000 3,400 14,000 87,000 <1,000
<br /> 02/13/96 24 84 -1595 000 4,800 5,800 2,100 8,700 59,000 <500
<br /> 04/18/96 2245 -1356 000 5,100 6,700 2,600 11,000 78,000 <250
<br /> 08/08/96 2360 -1471 000 4,200 5,900 2,600 12,000 58,000 <1,250
<br /> 11/04/96 2394 -15 05 000 4,300 4,300 2,600 11,000 67,000 <250
<br /> 02/03/97 -- -- __
<br /> 05/08/97 Converted to UVB well
<br /> RW4 01130191 9 23 3480 -2557 000 30,000 41,000 4,500 27,000 170,000 --
<br /> 11pro3ecls%739421master%wplg9DD139426w XIS Pale 26 of 37
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