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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />December 22, 2020 <br />Angela Aalbers <br />Page 12 of 12 <br />Reference: East Taylor Seep Investigation <br />• Lining Taylor Creek to prevent diverting flows through the highwall miner holes is an alternative to <br />consider to reduce (not eliminate) the seep flows. <br />o There would still be flows from the East Taylor Seep if all stream water were intercepted <br />o Lining the channel and intercepting the alluvial baseflow would be highly disruptive to the <br />stream ecology and could be difficult to permit. <br />o Piping the flow is not a long-term solution, but a ditch lining product could be a long-term <br />solution. <br />o This could be a cost-effective means to limit the variability of seep flows, and the amount of <br />flow variability will be confirmed by ongoing seep flow rate monitoring. <br />References <br />Day, Michael, et. al. 2010. Northwest Piceance Creek Basin Hydrogeology. 30th Oil Shale Symposium. <br />Colorado School of Mines. October 18-20, 2010. <br />Leonard Rice Consulting Water Engineers, Inc. 1979. Ground Water Quality, Colowyo Coal Mine. Exhibit 7, <br />Item 1. Prepared October 1979. <br />OSMRE 2016. Environmental Assessment, Trapper Mine, Moffat County, Colorado. U.S. Department of the <br />Interior, Office of Surface Mining Reclamation and Enforcement. Denver, Colorado. April 2016. <br />NDMC 2020. United States Drought Monitor. The National Drought Mitigation Center. University of <br />Nebraska -Lincoln. https:Hdroughtmonitor.unl.edu/ <br />Sanchez, Christopher E. and Wood, M. Karl 1988. Infiltration Rates and Erosion Associated with Reclaimed <br />Coal Mine Spoils in West Central New Mexico. Landscape and Urban Planning, 17: 151-168. June <br />28, 1988. <br />USGS 1981. Hydrogeochemistry and Simulated Solute Transport, Piceance Basin, Northwestern Colorado. <br />Geological Survey Professional Paper 1196. USGS. 1981. <br />USGS 2020. StreamStats: Streamflow Statistics and Spatial Analysis Tools for Water -Resources <br />Applications. https://streamstats.usgs.gov/ <br />WRCC 2020. Western Regional Climate Center. Desert Research Institute. Reno, Nevada. <br />https://wrcc.dri.edu/ <br />WUnderground 2020. Weather Underground. www.wunderground.com <br />tantec Consulting Services Inc. <br />Paul Kos <br />Senior Geological Engineer <br />paul.kos@stantec.com <br />Design with community in mind <br />pk c:\users\pkos\documents\_projects\colowyo\easttaylorseepwaterbalance_22dec2020_final.docx <br />