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i <br /> f <br /> Beacon Station No 641 June XX, 1998 <br /> Stockton,CallfQmia Groundwater Monitoring Report <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 /> Elevationt Date Depth of Water water Product/ 8020/8260 benzene <br /> (feet) Well Elevation Odor <br /> (feet) (feet) (feet) I (feet) (ppb) I (ppb) I (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-1 11/14/96 7995 5702 4251 sheen 14,000 1,200/na 4,400 1,200 510 1,300 nd$ <br /> 9953 03/18/97 7965 5125 4828 none 1,900 270/na 220 17 <1 3 13 nd <br /> 03/31/98 7975 4909 5044 no/odor 370 95/na 28 29 52 15 na <br /> MW-2 10/02/97 72 05 55 64 4320 no/no 83,000 <1000/940 16,000 18,000 2,600 12,000 nd <br /> 98.84 03/31/98 7181 4845 5039 no/sl odor 1,100 14/na 68 6 0 <0 50 9 9 na <br /> MW-3 10/02/97 7470 5762 4206 no/no 1,700 11/77 90 8 7 067 2 6 nd <br /> 9968 03/31/98 7451 4914 5054 no/no 170 <5 0/na 067 <0 50 <0 50 <0 50 na <br /> i <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 03/31/98 72 80 4972 5028 no/sl odor 2,000 <50/na 14 3 9 <0 50 75 na <br /> MW-5 10/02/97 7360 5733 4225 no/no 87,000 5,700/3,800 21,000 10,000 21000 10,000 nd <br /> 9958 03/31/98 73 10 49 19 5039 no/odor 10,000 530/na 2,100 1,500 270 710 na <br /> SW-1 10/02/97 6506 5657 na ns ns ns ns ns ns ns nd <br /> 03/31/98 65 04 5123 nm ns Its ns ns ns ns its ns <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 nm=not measured <br /> f Relative elevation <br /> $=nd=none detected(above laboratory detection limits)for oxygenates di-isopropyl ether(DIPS),ethyl-t-butyl ether(ETBE),Cert-amyl methyl ether(TAME),methanol,ethanol,and tert- <br /> butanol by EPA Method 8260 See laboratory data sheets for detection limits <br /> 641QMR98 Q1 HORIZON ENVIRONMENTAL INC <br />