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i <br />Mike Boulay -46- April 11, 2011 <br />property. Since sedimentation control requires silt fence/berm combination for <br />this road, the 30' road width (total) gets narrowed to 20' total. Therefore, lane <br />width will be 10 feet. <br />118. Page 2.05-10 describes the proposed methods of haul road construction. What <br />is the type of borrow material to be used to construct embankments? The <br />proposed lift thicknesses of 12" may be too great to achieve the desired <br />compaction, unless the material includes a high percentage of cobble-sized <br />material. AASHTO T99 is appropriate for use with fine-grained soils. However, <br />for road base surfacing, T180 is the preferred method. <br />CAM: The type of material for each haul road will be granular and is as shown on Map- <br />15 in the typical section for Haul Road #1, and Haul Road #2. "Fine grained" was <br />added to address compaction testing by AASTHO T99. Please see revised page <br />2.05-10. Embankment material is addressed on page 2-05.10. <br />The Division is willing to meet with representatives of CAM to discuss or clarify this <br />letter. If you would like to schedule a meeting or if you have questions, please contact <br />me. <br />Sincerely, <br />James E Stover, P.E. <br />Consulting Engineer <br />Enclosures <br />Volume I: <br />Table of Contents <br />Section 2.03.4, pages 2.03-4 through 2.03-17, page 2.03-20 <br />Section 2.04 <br />Section 2.05 <br />Page 2.06-2 <br />Volume II - Maps: <br />All maps except Maps 6, 14 and 20 <br />New Map-22 <br />Volume II - Exhibits: 3, 4, 5, 7, 8, 9, 10, 11, 14, 16 <br />Cc: DRMS - Denver - 2 Copies <br />DRMS - Durango - 1 Copy <br />McClane Permit <br />Mary Bloomstram - Edge Environmental