REV100353

• Permit No: C1980003
• IBM Index Class Name: Revision
• Doc Date: 9/11/1987
• Doc Name: SUMMARY
• Type & Sequence: SL1
• Media Type: D
• Archive: No

' RESPONSE: Technical Revision No. 52 which was submitted in September of
1986 provides documentation that drainages have been reestablished
including drainage profiles. The Division was supplied with 5 copies of
the revision which can be referred to for documentation.
' 4. Documentation that drainage control has been established in accordance
with the approved plan.
' RESPONSE: Exhibit D in Section 5, the approved post mining contour map,
indicates the as-built locations of the following drainage control
structures: perimeter collection ditches, sedimentation pond HG-8,
' temporary terrace ditches, and the permanent drainage system. Exhibits E,
F, and G are as-built, cross-sections of Ditch Ifl and Ditch /t3 of the
permanent drainage system and are included to illustrate compliance with
the approved design. All regraded areas drain into the approved sediment
control system.
' S. Documentation that permanent impoundments have achieved the criteria
' of Rules 4.05.6 and 4.05.9 This shall include an engineer
certification and a discussion of the future maintenance.
' RESPONSE: Section 4 contains a copy of the annual sediment pond storage
survey report dated July, 1985 which documents that the pond identified as
' outfall 004 (sedimentation pond HG-8) has achieved the criteria of Rules
4.05.6 and 4.05.9. Also enclosed is a copy of a letter from Dan Mathews
' of the Division dated November 25, 1985, stating that the pond is
acceptable as a permanent impoundment.
' Future maintenance will be performed on the pond as deemed necessary, with
quarterly pond inspections continuing during the extended liability
' period. The pond will be operated to contain flows from the 10-year,
24-hour storm event and will be maintained as a sedimentation pond. Water
' storage will be maintained at a volume sufficient for use by livestock and
wildlife.
3253h/
(a)