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2011-07-11_APPLICATION CORRESPONDENCE - C2010088
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2011-07-11_APPLICATION CORRESPONDENCE - C2010088
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Last modified
8/24/2016 4:35:29 PM
Creation date
7/11/2011 10:38:45 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C2010088
IBM Index Class Name
APPLICATION CORRESPONDENCE
Doc Date
7/11/2011
Doc Name
Adequacy Response #1
From
J.E. Stover & Associates, Inc
To
DRMS
Email Name
MPB
SB1
Media Type
D
Archive
No
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Mike Boulay <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: Comment noted and addressed under section 2.05.3(3) as requested. <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 />With respect to sediment control, the typical section on Map 15 shows the <br />roadway surface having a 2% cross slope to the south, 2H:1 V side slopes, and a <br />berm with 2H:1 V slopes on the south side of the road. The height of the roadway <br />embankment and the height of the berm are not shown. The Division suggests <br />that given the flat nature of the roadway profile and the ground surface, <br />and the limited space available, other BMPs, e.g. silt fence or excelsior <br />logs, might be preferable to construction of a bermed ditch. <br />CAM: Due to limited easement width, haul road #1 has been redesigned to <br />incorporate excelsior logs, which will increase the lane width and will therefore <br />meet the requirements of Rule 4.03.1(3)(c). See revised Map -15 for a typical <br />section. The excelsior logs are explained on page 2.05 -12. <br />CAM Response: The type of material for each haul road will be granular and is <br />as shown on Map -15 in the typical section for Haul Road #1, and Haul Road #2. <br />"Fine grained" was added to address compaction testing by AASTHO T99. <br />Please see revised page 2.05 -10. Embankment material is addressed on page <br />2- 05.10. <br />Division Response: This item has not been resolved. A number of questions <br />remain regarding design and construction of the haul roads. These <br />questions are itemized in section 2.05.3(3) of this adequacy review letter. <br />Sincerely, <br />James E. Stover <br />Consulting Engineer <br />Cc: Denver- 2 copies <br />Marcia Talvitie, DRMS Durango <br />Corey Heaps - CAM Colorado LLC <br />Mary Bloomstram - Edge Environmental <br />-42- July 8, 2011 <br />
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