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= =or mmmmmm I mmmmmmmr <br /> Beacon Station No 641 December 8, 1997 <br /> Stockton,California Report_o_f_Subsurface Investigation <br /> Table 2 - Groundwater Data <br /> GROUNDWATER LEVEL MEASUREMENTS LABORATORY ANALYTICAL DATA <br /> Well No/ Sampling Total Depth to Ground- Floating TPHg MTBE by Benzene Toluene Ethyl- Xylenes Oxygenates <br /> Elevattonf Date Depth of Water water Product/ 8020/8260 benzene <br /> (feet) Well Elevation Odor <br /> (feet) (feet) (feet) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1 11/14/96 7995 5702 42 51 sheen 14,000 1,200/na 4,400 1,200 510 1,300 nd$ <br /> 99.53 03/18/97 7965 5125 4828 none 1,900 270/na 220 17 <1 3 13 nd <br /> MW-2 10/02/97 7205 55 64 4320 no/no 83,000 <1000/940 16,000 18,000 2,600 12,000 nd <br /> 98 84 <br /> I <br /> MW-3 10/02/97 7470 5762 4206 no/no 1,700 11/77 90 8 7 067 26 nd <br /> 9968 <br /> MW-4 10/02/97 7320 5745 4255 no/no 35,000 3,400/1,800 9,300 600 1,100 3,600 nd <br /> 10000 <br /> MW-5 10/02/97 7360 5733 4225 no/no 87,000 5,70013,800 21,000 10,000 2,000 10,000 nd <br /> 9958 <br /> SW-1 10/02/97 6506 5657 na ns I ns ns ns ns ns ns nd <br /> I <br /> Wells measured from surveyed top of the north side of well casing TPHg=Total Petroleum Hydrocarbons as gasoline na=not analyzed ns=not sampled <br /> t Relative elevation <br /> $=nd=none detected(above laboratory detection limits)for oxygenates di-isopropyl ether(RIPE),ethyl-t-butyl ether(ETRE),tert-amyl methyl ether(TAME),methanol,ethanol,and tert-butanol by EPA Method <br /> 8260 See laboratory data sheets for detection limits <br /> 1641-13 rpt HORIZON ENVIRONMENTAL INC. <br />