2010-12-17_REVISION - C1981019 ‎(110)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/17/2010
• Doc Name: Rule 4 Performance Standards
• Type & Sequence: PR3
• Media Type: D
• Archive: No

RULE 4 PERFORMANCE STANDARDS
Should plans change and permanent disposal of excess spoil occur out of pit, during construction of the
Fill, Colowyo will provide the following information in certified reports as required by Rule 4.09.1(11).
Inspections will be conducted at least quarterly during the construction period and during the
following specific construction periods.
a. removal of topsoil and organic material
b. placement of underdrain system
C, installation of surface drain system
d. placement of fill material to insure that the largest rocks are reaching the bottom of the
dump face and that the formation of voids that adversely affect mass stability are
prevented and
e. revegetation
The purpose of the inspections is two fold. First, these inspections will document and certify that the
construction plan is being followed. Secondly, during the above phases of the construction, a key
emphasis of all inspections will be to implement routine contingencies as situations warrant. For
example, perhaps a section of underdrain should be reworked, or the spoil dump raised to provide
optimum gravity spoil sorting. Inspections and implementation of contingencies during these critical
phases of fill construction will be a routine but very important component of fill inspections.
2. Each certified inspection report will be provided to the Division within two weeks after each
required inspection. Each report will certify that the fill has been constructed as specified in the
minimum design approved by the Division. The reports will include a description of any
0 appearances of instability, structural weakness and other hazardous conditions observed during
the inspection.
3. Certified reports addressing the underdrain system will include color photographs taken during
and after construction, but before the underdrain is covered with spoil.
After construction, the fill will be monitored quarterly for the following items and reports will be
submitted in the Annual Reclamation Reports. Monitoring will continue until such time that DRMS staff
approve a revision to this plan.
1. The groundwater piezometer well will be established in the valley bottom and will be monitored
quarterly for water level and the other parameters consistent with the present Colowyo
groundwater monitor plan.
2. On a quarterly basis, a certified report by a registered engineer will be completed taking into
consideration any changes and will note any evidence of surficial slope failure or the formation of
springs or seeps on the face of the fill.
4.10-4.12 DISPOSAL OF EXCESS SPOIL
These sections are addressed in the original permit.
4.13 CONTEMPORANEOUS RECLAMATION
All reclamation efforts, including backfilling, grading, topsoil replacement and revegetation of land
disturbed by the mining activities in the Collom Lite and Little Collom X pits shall occur as
contemporaneously as practicable with mining operations. Implementation of the reclamation plan, as
Collom — Rule 4, Page 23 Revision Date: 1/23/09
Revision No.: PR -03