2016-10-17_REVISION - C1982057 - Laserfiche WebLink

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A,"k RE's�� D SENECA Property, LLC 0c1 ` `�'�� Seneca Property, LLC Janet Binns )MSION 0 ff KA October 11, 2016 Division of Reclamation, Mining, and SaMONO AND SAFETY 1313 Sherman Street, Room 215 Denver, CO 80203 RE: Seneca Property, LLC —Seneca II West Mine (Permit C-82-057), Minor Revision (MR16-83) — Sediment Pond Capacity Survey Frequency Reductions Dear Mrs. Binns, Seneca Property, LLC (SPL) requests CDRMS approval of a Minor Revision (MR16-47) to our approved Permit for the Seneca IIW Mine, for a reduction in the frequency of sediment pond capacity surveys. SPL requests a variance from the requirement to conduct annual surveys of sediment ponds, as required by Rule 4.05.9(15)(C). The sediment ponds throughout the Seneca IIW Property have been surveyed on an annual frequency throughout the reclamation period. From 2008 to 2015, SPL has seen minimal storage capacity loss in all of the sediment ponds. Table 13-3 from the Annual Reclamation Report has been attached for a visual reference of the history of the storage capacity levels. The Seneca IIW Mine Property is currently in the reclamation phase and has established a great stand of vegetation which has substantially reduce the sediment flowing in to the sediment ponds, therefore SPL does not see annual capacity surveys on the sediment ponds to be necessary. In addition, SPL has ruled the procedure for which SPL conducts pond capacity surveys to be unsafe. With this revision submittal, SPL is requesting that Ponds 005 and 009 be reduced to visual sediment inspections on an annual frequency. These two ponds generally do not flow year round which would allow SPL to inspect the inlet for deltas, which would indicate sediment build up. For Sediment Ponds 006, 015, 016, and 017, which generally flow year round, SPL is requesting a reduction from annual capacity surveys to a frequency of conducting capacity surveys every five years and visual inspections annually. The application package contains the following: • Minor Revision Application • ARR Table 13-3, for visual reference • Insertion Instructions • Revised Permit Text We look forward to working with you to facilitate timely review and approval. Please review, and feel free to contact me with any questions on this application or related matters. Sincerely, Miranda Blomquist Engineering Technician- Environmental Peabody Energy- Seneca Property, LLC Seneca Property, LLC • 29515 Routt County Road #27 • Oak Creek, Colorado 80467 Telephone (970) 870-2718