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For stream sites, monitoring at YSS2 (Sage Creek below Pond 012) have been changed from monthly to tri- <br />annual (spring runoff, post-runoff and baseflow). For spoil springs, monitoring has been changed from semi- <br />annual to annual (May - July). Three new spoil springs (#2, 3 and 4) have been included into the <br />monitoring program. Table 15-9, Surface Water Monitoring Frequencies (page 24, Tab 15), has been <br />revised to reflect these changes. <br />Yoast Technical Revision 39 (20091 Monitoring Program Changes <br />This technical revision assigned ground water points of compliance for the Yoast Mine. Details for <br />this revision are found in Attachment 15-1. <br />Literature Cited <br />Brankensiek, D.L., H.B. Osborn, and W.J. Ranis. 1979. Field Manual for Research in Agricultural <br />Hydrology. U.S. Department of Agriculture, Agriculture Handbook. 550 p. <br />Buchanan, T.J. and W.P. Sumers. 1968. Stage Measurements at Gaging Stations. U.S. Geological <br />Survey TW 13-A7. 28 p. <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 />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 />• <br />TR-39 <br />27 <br />Revised 1/09