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Upper Pit 6900 Access Road I Design Summary American Gypsum
<br /> cultural resources within the disturbance area. After the road is no longer needed for mining
<br /> activities, the road will be regraded to 3H:1V maximum slopes and revegetated, with efforts made
<br /> to blend with existing topography. The culvert will be plugged at both ends, riprap removed, and
<br /> a riprap-lined surface water diversion channel will be constructed over the reclaimed slope to
<br /> reestablish the surface water drainage.
<br /> 8.0 References
<br /> Autodesk, Inc., 2017. AutoCAD 2018 Civil 3D [computer software]. San Rafael, CA.
<br /> Civil Software Design, LLC, 2010. Sediment, Erosion, Discharge by Computer Aided Design
<br /> (SEDCAD) 4 for Windows (Computer Software), 2010.
<br /> Colorado Division of Reclamation, Mining-Safety (CO DRMS), Department of Natural
<br /> Resources, 2001. Eagle-Gypsum Mine, Amendment Approval, Permit No. M-1984-041
<br /> Revision No. AM-3. Letter to Stephen Onorofskie from Gregg R. Squire, Environmental
<br /> Protection Specialist, 05 February 2001.
<br /> Colorado Division of Reclamation, Mining and Safety (CO DRMS), Department of Natural
<br /> Resources, 2016. Design Standard of Care for Slope Stability/Geotechnical Analyses.
<br /> Memorandum prepared for Tony Waldron, 31 March 2016.
<br /> Federal Highway Administration (FHWA), 1989. Hydraulic Engineering Circular(HEC) No. 11:
<br /> Design of Riprap Revetment, March 1989.
<br /> Federal Highway Administration (FHWA), 2015. 'HY-8', Version 7.4, [computer software].
<br /> Washington, DC.
<br /> Gamba, 2018. AutoCAD file, Pond-M501-SPC-502-NAVD88.dwg, received 06 September 2018.
<br /> GEOSLOPE International Ltd., 2018. GeoSlope International Software, Slope Stability Analysis
<br /> (SLOPE/W), Version 9.0.4, http://www.oeo-slope.com/.
<br /> Marino and Hoek, 2000. GSI: A Geologically Friendly Tool for Rock Mass Strength Estimation.
<br /> 2000.
<br /> Natural Resources Conservation Service (NRCS), 2010. Part 630 National Engineering
<br /> Handbook (NEH), Chapter 15, Time of Concentration. U.S. Department of Agriculture.
<br /> 210-VI-NEH, May 2010.
<br /> Natural Resources Conservation Service (NRCS), 2016. Custom Soil Resource Report for
<br /> Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties. Webpage
<br /> visited 19 December 2016. http://websoilsurvev.sc.eqov.usda.qov/App/HomePage.htm.
<br /> Perica, S., D. Martin, S. Pavlovoc, I. Roy, M. St. Laurent, C. Trypaluk, D. Unruh, M. Yekta, and
<br /> G. Bonnin, 2013. NOAA Atlas 14, Precipitation-Frequency Atlas of the United States.
<br /> Volume 8, Version 2.0: Midwestern States (Colorado, Iowa, Kansas, Michigan,
<br /> Minnesota, Missouri, Nebraska, North Dakota, Oklahoma, South Dakota, Wisconsin).
<br /> U.S. Department of Commerce, National Oceanic and Atmospheric Administration,
<br /> National Weather Service. Silver Spring, Maryland. Original 2012; revised 2013.
<br /> RocScience, Inc., 2011. RocLab Software. http://www.rocscience.com. Toronto Ontario, Version
<br /> 1.032.
<br /> U.S. Army Corps of Engineers (USACE), 2010. Hydrologic Modeling System (HEC-HMS),
<br /> Version 3.5. USAGE, Hydrologic Engineering Center, Davis, CA, USA.
<br /> AG Upper Pit 6900 Access Rd 20181015 October 2018 Page 8 of 9
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