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7-ir we � � _r <br /> TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration (/L) <br /> Well Elevation to Water Elevation Thickness Ethyl_ <br /> No Date (feet msl) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> V4 05/02/91 938 32 10 -2268 005 31,000 58,000 5,700 29,000 200,000 -- <br /> 07/16-17191 938 33 06 -2365 004 Not sampled -LPH <br /> 10/15/91 938 33 74 -2434 003 Not sampled- LPH <br /> 01/28/92 938 3192 -2254 Sheen 23,000 63,000 5,300 27,000 220,000 -- <br /> 04/30/92 938 3148 -2209 001 Not sampled -LPH <br /> 08/13/92 938 3360 -24 17 007 Not sampled-LPH <br /> 10/08/92 938 3420 -24 73 0 12 Not sampled- LPH <br /> 02/23/93 938 3085 -2147 000 15,000 35,000 4,300 23,000 150,000 -- <br /> 05/18/93 9 38 2935 -1997 000 13,000 47,000 5,900 28,000 240,000 -- <br /> 08/22/93 938 2960 -2022 000 9,400 42,000 3,900 21,000 150,000 -- <br /> 12/30/93 938 2926 -1988 000 10,000 36,000 4,800 26,000 150,000 -- <br /> 02/17/94 938 28 89 -1951 000 -- -- __ __ __ <br /> 05/10/94 938 2854 -19 16 002 Not sampled - LPH <br /> 08/02/94 938 2993 -2055 002 Not sampled-LPH <br /> 11/01/94 938 3034 -2096 000 <br /> 02/17/95 938 2782 -1844 000 -- -- -- -- -- <br /> 05/11/95 938 25 12 -15 74 Sheen <br /> 08/24/95 938 -- -- <br /> 10/19/95 938 2685 -1747 Sheen <br /> 02/13/96 938 2474 -1536 Sheen <br /> 04/18/96 9 38 2236 -1298 Sheen <br /> 08/08/96 938 23 60 -1422 Sheen -- -- -- __ -- <br /> 11/04/96 938 2402 -1464 000 3,200 24,000 2,900 16,000 120,000 <1,250 <br /> 02/03/97 938 1940 -1002 Sheen -- -- -- -- _- -- <br /> 05/08/97 822 1926 -1104 Sheen <br /> 08/26/97 822 20 80 -1247 0 15 -- -- -- -- _- <br /> g 1pro3ects1739421m!,LLrlN%plg601L3942gwxls Page 42 of46 <br />