Laserfiche WebLink
Corey Heaps <br />CAM Colorado LLC <br />June 21, 2011 Page 58 <br />The Division notes that two separate 30' easements are addressed in the "Easement and <br />Reaffirmation Agreement" found in Exhibit 1: a Central Easement and a South <br />Easement. If two -way traffic cannot be safely accommodated within one easement, does <br />the potential exist for one -way in and one -way out using both easements? <br />Please revise the design for Haul Road #1 to comply with the requirements of <br />4.03.1(3)(c). <br />With respect to sediment control, the typical section on Map 15 shows the roadway <br />surface having a 2% cross slope to the south, 211:1 V side slopes, and a berm with 2H:1 V <br />slopes on the south side of the road. The height of the roadway embankment and the <br />height of the berm are not shown. The Division suggests that given the flat nature of <br />the roadway profile and the ground surface, and the limited space available, other <br />BMPs, e.g. silt fence or excelsior logs, might be preferable to construction of a <br />bermed ditch. <br />118. Page 2.05 -10 describes the proposed methods of haul road construction. What is the type <br />of borrow material to he used to construct embankments? The proposed lift thicknesses <br />of 12" may be too great to achieve the desired compaction, unless the material includes a <br />high percentage of cobble -sized material. AASHTO T99 is appropriate for use with fine - <br />grained soils. However, for road base surfacing, T180 is the preferred method. <br />CAM Response: The type of material for each haul road will be granular and is as shown <br />on Map -15 in the typical section for Haul Road #1, and Haul Road #2. "Fine grained" <br />was 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 />Division Response: This item has not been resolved. A number of questions remain <br />regarding design and construction of the haul roads. These questions are itemized <br />in section 2.05.3(3) of this adequacy review letter. <br />The Division is willing to meet with.representatives of CAM to discuss or clarify this letter. If <br />you would like to schedule a meeting or if you have questions, please contact me. <br />Sincerely, <br />!`ltVd r' 310d, <br />Michael P. Boulay <br />Environmental protection Specialist <br />C: Denver File <br />