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2006-03-08_REVISION - M2001088
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2006-03-08_REVISION - M2001088
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Last modified
6/15/2021 6:06:02 PM
Creation date
11/21/2007 11:47:33 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2001088
IBM Index Class Name
Revision
Doc Date
3/8/2006
Doc Name
Adequacy Review
From
DMG sss
To
Map Surveys Inc.
Type & Sequence
CN1
Media Type
D
Archive
No
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11. If the boundary of Unit 11 is changed to address item 3 above, please ensure this location is <br />still included in the proposed affected area. <br />Exhibit D -Mining Plan <br />7. The December 12, 2005 inspection noted that several feet of overburden lies over the gravel <br />across much of the site. The original permit specified little to no overburden. Please revise the <br />permit accordingly and include average depth of overburden and topsoil, an estimated volume of <br />this soil material to be excavated and replaced, and a soil handling plan that addresses origin and <br />placement of soils (unit by unit) correlated with stockpiling and/or direct hauling plans. <br />8. During the December 12, 2005 inspection the operator representative stated that the two acre <br />processing area was very tight when stockpiles were added. If the processing area is to be <br />increased in size, this conversion can be used to address those changes. <br />9. Please provide a plan for stabilization of topsoil and overburden stockpiles to protect against wind <br />and water erosion as well as weed infestation. <br />10. The underlying stratum is identified as shale. If Mancos shale, please describe measures to be <br />implemented to prevent exposing the shale to oxidization potentially increasing selenium loading <br />to surface and groundwater resources. <br />Exhibit E -Reclamation Plan <br />11. Please remove the statement providing a three year guarantee on the revegetation. This <br />statement is neither supported nor required by the Construction Materials Rules and Regulations. <br />Revegetation success criteria are specified in Rule 3.1.10. <br />12. Please remove the statement that "no topsoil will be saved so underlying soils will be <br />conditioned...". There is obviously an abundance of overburden over the gravel that is currently <br />being stockpiled and direct hauled for reclamation, grading and revegetation purposes. Please <br />revise the reclamation plan and Exhibit L cost estimate to account for the soil handling tasks <br />associated with reclamation of the site. Across-section of the pit showing the anticipated final pit <br />floor and the final reclamation surface would greatly help determination and verification of the <br />volumes of fill material and the grading necessary to meet the proposed post mine configuration. <br />13. Please either demonstrate that the proposed sediment control features are adequate to handle <br />the anticipated stormwater flows without discharge, or provide plans for a discharge feature for <br />the catch basin that is designed to safely discharge any excess flow from the pond without <br />erosion of permitted or adjacent lands. The 10 year 24 hour storm event should be used to size <br />these features. <br />14. Please provide all information required by Rule 6.4.5(2) including all phases of reclamation, soil <br />replacement, grading, seed bed prep (tilling, discing), seed mix species, and methods, rates and <br />timing for seeding, fertilizing, and mulching. This information may be in the CSU extension office <br />publication referred to in the reclamation plan, however, this publication was not included with the <br />application as stated in the plan. <br />15. Please commit to fall seeding between September 15 and October 15. <br />
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