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<br />TR-54 Revised 3/25 <br /> <br />33 <br />but since the adjacent Y..30 wells monitor the same strata, YW7 and YOV9 are no longer <br /> necessary. <br />- Wells YW14 and YOV15 (old USGS wells nested together): These wells exist in an isolated (ie, not <br /> hydraulically connected) block of coal in the southwest corner of the permit area that was <br /> never mined. YW14 never had more than 2.3 feet of water in the well. YOV15 was often <br /> dry, but never had more than 0.68 feet of water in the well. <br /> <br />Yoast Technical Revision 54 (2025) Monitoring Program Reductions <br /> <br />Discontinue all ground water monitoring in preparation for abandonment procedures to take place <br />prior to final release of SL8 mid 2025. Past Annual Hydrology Reports show ground water is with in <br />compliance and stable at the site. <br /> <br /> <br />Literature Cited <br /> <br />Brankensiek, D.L., H.B. Osborn, and W.J. Ranls. 1979. Field Manual for Research in Agricultural <br />Hydrology. U.S. Department of Agriculture, Agriculture Handbook. 550 p. <br /> <br />Buchanan, T.J. and W.P. Sumers. 1968. Stage Measurements at Gaging Stations. U.S. Geological Survey <br />TWI 3-A7. 28 p. <br /> <br />Driver, N.E. and R.S. Williams, Jr. 1991. Water-Quantity and Water-Quality Data for an Area Leased to be <br />Surface Mined for Coal in Northwestern Colorado. U.S. Geological Survey Open File Report 90-708. <br />Denver, Colorado. <br /> <br />Williams, R.S., Jr. and N.E. Driver. 1982. Plan for Hydrologic Study of an Area to be Surface Mined for <br />Coal in Northwestern Colorado. U.S. Geological Survey Open File Report 82-874. Denver, Colorado. <br />