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6.5- Geotechnical Stability Exhibit <br />Table 6.5.2 -Model Output <br />Critical Surtace <br />Mine Slope Minimum Setback Factor of Safety <br />East 55' 1.00 <br />Southwest 50' 1.01 <br />Northwest 45' 1.06 <br />Discussion <br />Maintaining a minimum setback as shown above from any road or oil and gas structure <br />is considered safe for this project. <br />REINFORCED CONCRETE SLAB GAS LINE CROSSING DESIGN ' <br />Introduction <br />In order to construct an access road for the Nelson Mining Resource in Weld County, <br />Colorado, the access road will need to cross a future buried Kerr-McGee and Noble <br />Energy Production Inc. Gas Line. <br />Kerr-McGee's requirements for heavy vehicle crossings include eight feet of cover for <br />load dissipation to protect the buried pipe from excessive localized deflection. The <br />proximity of this crossing to an existing County road precludes changes in vertical <br />alignment necessary to accommodate eight feet of cover. <br />Instead, we propose 3.25 feet of cover (including six inches of aggregate compacted to <br />100%), plus a 9.5-inch reinforced concrete slab for load dissipation. The concrete slab <br />would extend ten feet on each side of the pipeline (as per Kerr-McGee's requirements), <br />for a total length of 20 feet, and it would cover the full 30-foot width of the roadway. <br />Design Criteria <br />We anticipate that traffic for the access road will include fully-loaded concrete mixers <br />and 18-wheeled semi-trailers. To approximate those loading conditions, our design is <br />based on an AASHTO HL-93 live load in each traffic lane (distributed load of 0.64kip/ft, <br />and three concentrated loads of 8 kips, 32 kips, and 32 kips). Additionally, we have <br />included a live load factor of 1.6. <br />