GENERAL51991

• Permit No: C1989074
• IBM Index Class Name: General Documents
• Doc Date: 2/19/1993
• Doc Name: Midterm Review Findings Document
• Permit Index Doc Type: Findings
• Media Type: D
• Archive: No

Section II - Revisions to the Permit
Since permit issuance on December 12, 1990, Rimrock Coal Company has submitted
the following revisions for the Rimrock Strip Mine:
Minor Revision No. 1 was field-issued and approved with conditions on
January 13, 1993. This revision allowed the drilling of two exploration
drill holes on the east ridge of Engleville Gulch, in order to gather
information for potential phase two mining. Stipulation No. 3, which was
attached to this revision, was satisfied. The bond was not increased
because the phase two mining reclamation bond already covered disturbance
in this area.
Minor Revision No. 2 was field-issued and approved with conditions on
January 13, 1993. This revision allowed the placement of pond excavation
material onto a previously undisturbed site. Stipulation No. 4 was
attached to this revision and was satisfied. Bond was not increased
because this site was to become part of the coal stockpile area and,
therefore, was already bonded for reclamation.
Minor Revision No. 3 was submitted on February 1, 1993 and was approved
on February 4, 1993. This revision allowed the replacement of a 36-inch
diameter culvert with two 24-inch diameter culverts. The location of
these culverts is along the west pit collection ditch, underneath the
road leading to the topsoil stockpile.
Technical Revision No. 1 was submitted on February 1, 1993 and is
currently going through the adequacy process. This revision would change
the pond embankment design inslope and outslope from 2 H:iV to 2.5 H:1V.
Section III - Status of Stipulations
Two stipulations were attached to the permit document of December 12, 1990.
Two additional stipulations were added to the field-issued minor revisions on
January 13, 1993.
Stipulation No. 1
Within 30 days of permit issuance, the permittee must submit a statement
certified by a registered professional engineer attesting that the
sediment pond has been constructed as designed. It should also include
how the sediment storage monitoring is going to be implemented.
As of this midterm review date, this stipulation, attached to the permit
document, has not been fully satisfied. The original pond certification
of December 23, 1992 was not accepted by the Division. NOV C-93-005 was
issued as a consequence. The February 8, 1993 pond certification
submittal has not been verified in the field by the Division yet. In
addition, the sediment storage monitoring plan needs to be implemented.
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