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Entrance <br /> 000,000000 "SUBST TION <br /> OOOO <br /> OW-4 OW-6 OW-5 LEGEND <br /> �TPH Isoconcentration line for <br /> ' v <br /> <1 groundwater (ppb) <br /> •�' G) OW-1 Observation well location <br /> 100 <br /> /"0-1000 Notes: <br /> Dashed Isoconcentration lines indicate areas <br /> 10000 of less confident estimate due to sparse data. <br /> OW-2�� W-1 <br /> N <br /> 0 10 20 feet <br /> FORMER <br /> TANK, <br /> LOCATION0000, <br /> 000 " <br /> OFFICE BUILDING <br /> OW-3 <br /> FIGURE 3-6 TPH Isoconcentration Lines Estimated for Ground Water- <br /> Tracy Service Center Underground Tank Investigation, February <br /> 1988 <br /> i <br />