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placement and compaction of backfill, on exposed undisturbed material of <br /> highwall, and in immediate response to any observed problems during inspections. <br /> (9) Soil to be placed (upper 3-6 inches) should include at least 20% organic material <br /> (shredded wood, brush, roots, chopped straw, but not sawdust or other fines) to <br /> provide a matrix for soil. Up to 10% can include rocks of maximum 2-inch diameter. <br /> Soil should be compacted to NOT MORE than 80%standard Proctor density at <br /> OMC. <br /> (10) Prohibit ALL vehicular traffic (wheeled/tracked) with ground pressure greater <br /> than 3 psi on all reclaimed slopes greater than 31-1:1 V following placement of soil, <br /> including for hydromulching. Ensure that fencing on the east side of the permit <br /> area is in sufficiently good condition to serve as a warning for vehicles to the east. <br /> (There are presently no gates in that fence.) <br /> (11) As area is unlikely to be grazed by livestock, and fencing is unable to <br /> adequately prevent wildlife from grazing, efforts to restrict access should be limited <br /> to vehicular and pedestrian traffic with signs and possibly construction fences to <br /> block old access points. <br /> (12) Although considered steep, the proposed 1:1 slope is not a safety hazard for <br /> wildlife, including game species. lit is also considered acceptable for wildlife <br /> habitat for this area. Colorado DPW local wildlife conservationist reviewed <br /> proposed slopes and determined that no problems existed. <br /> References: <br /> Geological Units of La Plata County, Colorado (WEBSITE: <br /> http://mrdata.usgs.gov/geology/state/fips-unit.php?code=f08067) <br /> Open File Report 97-59 Geology and Structure of the Pine River, Florida River, Carbon <br /> Junction, and Basin Creek Gas Seeps, La Plata County, Colorado <br /> Open File Report 99-06 Geologic Map of the Durango East Quadrangle, La Plata County, <br /> Colorado, 1999 <br /> Open File Report 99-04 Geologic Map of the Durango West Quadrangle, La Plata County, <br /> Colorado, 1999 <br /> Web Soil Survey (WEBSITE: ) Natural Resources Conservation Service <br /> Geologic Hazards Avoidance or Mitigation: A Comprehensive Guide to State Statutes, Land <br /> Use Issues and Professional Practice in Colorado (IS-47, CGS) <br /> Watershed Management Field Manual (FAO) Chapter 3. Road Design <br /> (http://www.fao.ora/docrer)/006/t0099e/T0099e00,htm#cont) <br /> Geotechnical Properties of Geologic Materials, Koloski et al. <br /> (htto://www.tubbs.com/geotech/geotech.htm) <br /> Soil Slope Stabililty Analysis using the Friction Circle Method Programmed in EXCEL, by Eugene <br /> Washington, PE, (http://www.pdhonline.com/courses/gl 10/gl 10.htm) <br /> Fundamentals of Soil Mechanics, Donald W. Taylor, February 1965 <br /> EM 1 1 10-2-1902, Slope Stability US Army Corps of Engineers, Engineer Manual, 31 Oct 2003. <br /> NOTE: Although the Durango 30x60 Quadrangle and the Durango East and West 7.5- <br /> minuteQuadrangles have been mapped for geology, the Loma Linda 7.5-minute <br /> Quadrangles does NOT have a published geological map, and county GIS geological maps <br /> are derived from the 30x60 USGS/CGS map. The J&J Pit is located approximately 3/4 miles <br /> south of the south edge of the Durango East Quadrangle, which does provide some <br /> Technical Revision to M1985-001 J&J Pit, LaPlata County, dated 24 AUG 2016 Page 29 <br />