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Mike Boulay <br />Additional Questions regarding Haul Road #1 <br />-21- July 8, 2011 <br />51a. Typical Section on Map 15 - How will thickness of Pit Run be determined? Is <br />there a minimum thickness? No discussion is provided. <br />CAM - Please see revised Map 15, and text added to page 2.05 -13. Thickness of pit <br />run will be determined prior to construction. From and email from Ken Haley, <br />City of Fruita Engineer, "The City of Fruita would require that improvements are <br />in place to structurally support the amount of truck traffic proposed". Similarly, <br />DRMS Rule 4.03.1(5) requires haul roads be surfaced and designed according to <br />the proposed volume of traffic, weight and speed of vehicles. The section shown <br />on Map -15 is based upon haul roads constructed at other mines and used by <br />similar trucks, with similar weights and volumes. There does not appear to be a <br />standard that must be followed for haul road construction. If during construction, <br />after placement of pit run, the road appears to 'pump' with heavy vehicle traffic, <br />more pit run will be added until a stable foundation is formed. Twelve inches <br />minimum pit run has been specified, additional pit run could be added if required <br />by on -site conditions. <br />51b. Page 2.05 -13, Haul Road Surfacing, says haul roads will be plated with 10 to <br />20 inches of gravel surfacing. Please make this description consistent with <br />what is shown on typical sections on Map 15 (including thicknesses of pit <br />run and 1 -1/2" road base). <br />CAM - Please see revised page 2.05 -13 and revised Map 15. <br />51c. Page 2.05 -13, Haul Road Maintenance, mentions road shoulders (none are <br />currently proposed, but possibly should be) and paved surface (none <br />proposed). Please review this paragraph to ensure it accurately describes <br />what is proposed. <br />CAM - Text about road shoulders and pavement was removed from page 2.05 -13. <br />Additional Questions regarding Haul Road #2 <br />51d. The last paragraph on page 2.04 -2 describes coke particulate matter (-10,000 <br />cy) that was buried in trenches. Haul Road #2 and the Rail Loop alignments <br />both cross the coke fines area. Has any type of geotechnical investigation <br />been done to ensure this is a suitable foundation for haul road and rail <br />traffic? Is there a minimum thickness of embankment material that will be <br />required to "bridge" across any unsuitable material? <br />CAM - There has not been any type of geotechnical investigation to ensure a suitable <br />foundation for haul road and rail traffic. CAM will perform necessary <br />geotechnical work prior to construction. <br />