_GENERAL DOCUMENTS - C1981017 ‎(259)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ Transfer of Permit SO1
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

Section 2 - Hydrology Review
I. Due to the complexity and length of record of data available
for the mine site, the Division requires a further reduction and
analysis of water sampling data for the mine. The ultimate
purpose is to provide a form where trends developed at the mine
can be identified and used by the operator to accomplish a revision
and updating of the Probable Hydrologic Consequences section of
the permit application. Specifically, the Division requires the
following data or reductions:
1. The mine discharge data should be plotted with TDS
versus pumpage rates for each mine in order to allow for a
depiction of TDS versus flow rate and develop a worst case loading
on Coal Creek during a Q, 7-10 low flow event. The data for the
1984 year to date should be graphed. This graphing should be
continued in each annual hydrologic report. See graphs, Attachment
#1.
2 . For the surface water monitoring sites, graphs should
be developed depicting flow, TSS, TDS, and iron as originally
accomplished in the permit application, Volume 5 , Appendix III-E-
5. See graphs, Attachment #2.
3 . The map depicting monitoring sites and NPDES pond
effluent points should be updated to include the mine discharge
points. See Exhibit ZV-C-1 and Exhibits II-B-2 a, b & c.
4 . For ground water monitoring sites, graphs should be
developed showing relationship of water level versus TDS , sulfate
and, iron for the period of record. See graphs , Attachment #3 .
5. The ground water quality tables as submitted February
14 , 1986 should include water level along with chemistry. See
charts , Attachment #4 .
II. The hydrology section of the permit application requires
updating to include a narrative describing a detailed Probable
Hydrologic Consequences of mining at the Coal Basin Mines. A
description of the following trends and possible impacts should
address:
1. Localized effects in each tributary to Coal Creek
2 . Effects on Coal Creek
3 . Effects on Crystal River
4 . Effects on alluvial bodies and their interplay with the
surface regime. (Updated discussions included in Findings Document. )