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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCRTON, CALIFORNIA Casing Depth Groundwater LPH Concentration /L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW3 01/28/92 889 3269 -23 70 0 14 Not sampled- LPH 04/30/92 3227 -23 34 006 Not sampled- LPH 08/13/92 3467 -25 50 039 Not sampled- LPH 10/08/92 3536 -2606 056 Not sampled - LPH 02/23/93 3134 -2245 000 4,100 4,300 1,600 8,300 47,000 05/18/93 3002 -2113 000 19,000 22,000 3,100 17,000 90,000 -- 08/22/93 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 -- 12/30/93 2963 -2074 000 18,000 22,000 2,900 15,000 96,000 -- 02/17/94 2927 -2038 000 9,600 14,000 2,200 9,600 70,000 -- 05/10/94 28 81 -1992 000 10,000 16,000 2,200 10,000 76,000 -- 08/02/94 3035 -2146 000 -- -- -- -- __ 11/01/94 3059 -21 70 000 11,000 16,000 2,800 14,000 92,000 -- 02/17/95 2808 -1919 000 9,800 12,000 2,600 11,000 79,000 -- 05/11/95 2537 -1648 000 7,600 10,000 2,700 12,000 90,000 -- 08/24/95 2672 -1783 000 9,600 15,000 4,600 20,000 100,000 -- 10/19/95 2705 -18 16 000 7,000 12,000 3,400 14,000 87,000 <1,000 02/13/96 24 84 -15 95 000 4,800 5,800 2,100 8,700 59,000 <500 04/18/96 2245 -13 56 000 5,100 6,700 2,600 11,000 78,000 <250 08/08/96 23 60 -1471 000 4,200 5,900 2,600 12,000 58,000 <1,250 11/04/96 23 94 -15 05 000 4,300 4,300 2,600 11,000 67,000 <250 05/08/97 Converted to UVB well RW4 01/30/91 923 3480 -25 57 000 30,000 41,000 4,500 27,000 170,000 -- 05/02/91 3479 -25 56 000 16,000 34,000 4,200 22,000 110,000 -- 07/16-17/91 3569 -2646 000 12,000 31,000 2,700 14,000 110,000 -- 10/15/91 3622 -2699 000 13,000 28,000 3,100 15,000 120,000 01/28/92 3439 -25 16 000 13,000 30,000 3,600 18,000 110,000 -- t 1proaeclsV739421niaster�up1g30113942gw As Page 30 of 41