2005-07-05_REVISION - M1998019 ‎(2)‎

• Permit No: M1998019
• IBM Index Class Name: Revision
• Doc Date: 7/5/2005
• Doc Name: adequacy review
• From: dmg
• To: grand gravel
• Type & Sequence: CN1
• Media Type: D
• Archive: No

Grand Gravel Pit Conversion to 112 Adequacy Review
M-1998-019
July 5, 2005
Page 3
conditions, and as such, can be used for any purposes, including industrial. Please confirm the
source(s) of any water required for this operation. Please see and respond to the enclosed
comments provided by the Office of the State Engineer, Colorado Division of Water Resources. (See
Item No. 26 of this letter.)
12. Pursuant to the Minerals Program Policy Memo "Oil and Fuel Spill Containment Structures," dated
April 8, 2005, (copy attached) please submit documentation that the applicant has an SPCC plan for
this site and that plan has or will be implemented prior to storage of fuel or oil products.
Rule 6,4.5 Exhibit E -Reclamation Plan
13. Please describe the final grading plan, especially site drainage. This can be accomplished by
showing final contours on the Reclamation Plan map.
14. The submitted Reclamation Plan refers to the NRCS report for seeding, but is unclear as to whether
all suggestions in the NRCS report will be adopted, especially with respect to revegetation and weed
control. Please clearly specify the measures that will be taken, including time and rate of seed
application to be used to revegetate the site and for weed control.
15. Please describe how the slopes will be prepared for topsoil placement (e.g., will it be ripped and/or
scarified?), how the seedbed will be prepared, and whether the seed will be raked or harrowed after
broadcast application. Describe any proposed fertilization (types, mixtures, quantities, and time of
application). Indicate whether mulching will be performed and, if so, the mulch crimping method to
be employed.
16. Submitted Exhibit E -Reclamation Plan states, "Top soil will be placed on sloped banks and floor of
pit 6 inches deep maximum." Based upon the supplied Natural Resources Conservation Service
(NRCS) letter and soils report, 8 to 15 inches of topsoil overlies the gravel and that "topsoil [should
be] spread to a minimum depth of 6 inches over scarified gravel." The topsoil must be replaced to a
minimum depth of 6 inches. Please specify a minimum and average topsoil replacement depth
consistent with salvageable topsoil at the site and amend Exhibit F, the Reclamation Plan map, for
consistency.
17. Rule 3.1.10 requires that the "revegetation plan shall provide for the greatest probability of success in
plant establishment and vegetation development...." The applicant has specified that reclaimed
slopes will be 2H:1V in the added mining area "or will be made 3:1 if required." 2H:1V slopes are
typically unstable and difficult upon which to establish vegetation, Please commit to no steeper than
3H:1 V slopes throughout the permit area.
18. Per Rule 6.4.5(2)(e), please clarify the reclamation schedule, including the estimated time required
for various stages or phases of reclamation, the size and location of each area to be reclaimed, and
the sequence in which each stage or phase will be carried out. This phasing may affect the amount
of reclamation bond that the Division will have to hold. Please contact me with any questions.
Rule 6.4.6 Exhibit F -Reclamation Plan Mag
19. Please see Item 2 of this letter.
20. Rule 6,4.6(a), requires that the Reclamation Plan map show "proposed topography of the area with
contour lines of sufficient detail to portray the direction and rate of slope of all reclaimed lands:'
Please add contours to fhe Reclamation Plan map to adequately depict the post mine topography.