APPCOR10867

• Permit No: C1984065
• IBM Index Class Name: Application Correspondence
• Doc Date: 10/26/1984
• Doc Name: RESPONSE TO DRAFT FINDINGS & STIPULATIONS
• From: STORM KING MINES
• To: MLRD
• Media Type: D
• Archive: No

FROM THE UPSTREAM AREA OF THE REFUSE EMBANKMENT DURING THE
FOLLOWING PHASES;
1) AFT&R MINING OPERATIONS CEASE AND NO FURTHER WASTE IS
BEING DEPOSITED IN THE UPSTREAM AREA OF THE REFUSE
EMBANKMENT, THE UNDISTURBED DRAINAGE ABOVE THE WASTE WILL
NEED TO BE DIVERTED AWAY FROM THE SLURRY EMBANKMENT. A
METHOD OF DEWATERING THE SLURRY SHOULD ALSO BE ADDRESSED.
2) AFTER THE SLURRY HAS DEWATERED TO THE POINT WHERE
REGRADING ZS FEASIBLE, THE SUBSEQUENT RECLAMATION PHASE WILL
REQUIRE CONTAINMENT OF RUNOFF FROM THE SLOPES OF THE REFUSE
WITHIN A SEDIMENT POND. CONTROL OF RUNOFF WILL BE REQUIRED
UNTIL REVEGETATION SUCCESS CRITERIA ARE MET."
SKM Response:
Storm King Mines will comply with the requirements of Stipulation
No. 4 within six months of permit issuance. These revised
designs will become part of the permit application documents
prior to starting Phase "B" of development.
MLR Comment:
"Sedimentation Ponds
All runoff from disturbed areas will be routed through one of two
sediment ponds. One sediment pond is planned to be constructed
to drain the disturbed area of the surface facilities and one
sediment pond is planned to be constructed to drain the disturbed
area of the coal refuse impoundment.
Each sediment pond is designed to contain the runoff from a
10-year, 24-hour runoff event. The surface facilities sediment
pond (Pond A) is designed to contain one year of accumulated
sediment and the coal refuse embankment sediment pond (Pond B) is
designed to contain approximately 7 months accumulated sediment.
The applicant has committed to semi-annual sediment cleanout of
both sediment ponds, therefore the designs should be adequate.
Sediment Pond A and B are designed with emergency spillways
capable of passing the peak flow from a 25-year, 24-hour
precipitation event. Neither sediment pond is equipped with a
principal spillway. Instead, the applicant proposes to install a
pumping system to dewater the sediment ponds and use the water in
the hydraulic mining system.
The sediment pond below the refuse embankment is not designed
with a liner. Some type of lining is important since seepage
from the refuse embankment will likely be highly saline. The