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. For stream sites, monitoring at YSS2 (Sage Creek below Pond 012) have been changed from monthly <br />to tri-annual (spring runoff, post-runoff and baseflowl. For spoil springs, monitoring has been changed <br />from semi-annual to annual (May - Julyl. Three new spoil springs IN2, 3 and 41 have been included <br />into the monitoring program. Table 15-9, Surface Water Monitoring Frequencies (page 24, Tab 15), <br />has been revised to reflect these changes. <br />Literature Cited <br />Brankensiek, D.L., H.B. Osborn, and W.J. Rants. 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 TWI 3-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 />I 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-34 27 Revised 04/07 <br />