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0 0 * - 1 - <br /> Beacon Station No 641 Groundwater Monitoring Report <br /> Stockton.California <br /> Table 2 - Groundwater Data <br /> GROUNDWATER LEVEL MEASUREMENTS LABORATORY ANALYTICAL DATA <br /> Well Nod 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) (feet) (ppb) (ppb) (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 /> 06/10/98 7974 4606 5347 no/odor <50 29/na <0 50 <0 50 <0 50 <0 50 na <br /> MW-2 10/02/97 7205 5564 4320 no/no 83,000 <1000/940 16,000 18,000 2,600 12,000 nd <br /> 9884 03/31/98 7181 4845 5039 no/sl Odor 1,100 14/na 68 60 <0 50 99 na <br /> 06/10/98 7180 4541 5343 no/sl odor 760 <5 0/na 20 16 <0 50 16 na <br /> MW-3 10/02/97 7470 5762 4206 no/no 1,700 11/77 90 87 067 26 nd <br /> 9968 03/31/98 7451 4914 5054 no/no 170 <5 0/na 067 <0 50 <0 50 <0 50 na <br /> 06/10/98 7452 46 10 5358 no/no <50 <5 0/na <0 50 <0 50 <0 50 <0 50 na <br /> MW4 10/02/97 7320 5745 4255 no/no 35,000 3,40011,800 9,300 600 1,100 3,600 nd <br /> 10000 03/31/98 7280 4972 5028 no/sl odor 2,000 <50/na 14 39 <0 50 75 na <br /> 06/10/98 7261 4663 5337 no/sl odor 2,400 na/12 60 12 <0 50 1 1 na <br /> MW-5 10/02/97 7360 5733 4225 no/no 87,000 5,700/3,800 21,000 10,000 2,000 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 /> 06/10/98 73 10 4622 5336 no/odor 3,100 180/na 510 470 45 310 na <br /> SW-1 10/02/97 6506 5657 na ns ns ns ns ns ns ns nd <br /> 03/31/98 6504 5123 na ns ns ns ns ns ns ns ns <br /> 06/10/98 6506 4584 na ns ns ns ns ns ns ns 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 /> T Relative elevation <br /> I=nd=none detected(above laboratory detection l,mits)for oxygenates&isopropyl ether(DIPS),ethyl-t-butyl ether(ETRE),tert-amyl methyl ether(TAME},methanol,ethanol,and tert- <br /> butanol by EPA Method 8260 See laboratory data sheets for detection limas <br /> GW-Table HORIZON ENVIRONMENTAL INC <br />