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REV02407
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Entry Properties
Last modified
8/25/2016 1:00:01 AM
Creation date
11/21/2007 9:00:39 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1984065
IBM Index Class Name
Revision
Doc Date
10/1/1990
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR PN 1 COAL RIDGE 1 MINE C-84-065
Type & Sequence
PR1
Media Type
D
Archive
No
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-8- <br />IV. Geology - Rules 2.04.5 and 2.04.6 <br />A geological description of the permit area and surrounding area, and <br />supporting data, are found in Sections 3.3.1 and 3.3.2 of the permit <br />application, along with Appendices 3.3-1 and 3.3-2. A detailed discussion of <br />the area's stratigraphy, structure, and hydrology is included in the Probable <br />Hydrologic Consequences/Cumulative Hydrologic Impact Study section of this <br />document, and also of the original Findings Document dated January, 1985. <br />The applicant is in compliance with the requirements of this section. <br />V. Hydrologic Balance: Surface Water <br />General information on the area's surface water resources is located on pages <br />3-36 to 3-48, with supporting data in Appendices 3.3-10, 3.3-11, and 3.3-12. <br />The baseline information provided is sufficient for the Division to assess the <br />likelihood of mining-related impacts to surface water systems. This topic is <br />discussed in the Probable Hydrologic Consequences/Cumulative Hydrologic Impact <br />Study portion of this document. <br />Information on and designs of diversions and the single sediment pond are <br />found in Section 4.3.4 of the Permit Revision application, and in Appendix <br />4.3-2. <br />The disturbed area of the Coal Ridge No. 1 site is drained by diversion <br />ditches which are designed to pass runoff from the 10-year, 24-hour <br />precipitation event. The diversions come together through a concrete box <br />designed to allow routing of the runoff to either half of Pond A. Culverts <br />which are part of the system are designed for the same precipitation event. <br />NCEC has committed to a maintenance schedule, described on page 4-38, for the <br />diversions. No clean-water diversion is required on the hillside above the <br />disturbed area, as the steep slopes would make construction and maintenance of <br />a stable diversion very difficult. Pond A is constructed with adequate <br />capacity to contain both the disturbed-area and clean water runoff from the <br />design event. Pond A and associated disturbed-area diversions are also <br />designed to capture any runoff caused by malfunction of the coal slurry system <br />(described in the Operations Plan section of this document). <br />Several small disturbed areas utilize alternative sediment control measures to <br />treat surface runoff, as this runoff does not pass through the sediment pond. <br />These small areas are shown on Figure 4.2-3 of the permit application, and <br />include the five topsoil stockpiles, the powder magazine pad, and the pump <br />house adjacent to Pond A. The sediment control measures consist of law berms <br />on the downhill sides of each area. The exemptions are granted in accordance <br />with the conditions listed in Rule 4.05.2(3), and the Division approves the <br />alternative sediment control based on the demonstrations provided. <br />With the exception of the small areas noted, all runoff from the disturbed <br />area will be routed through one sediment pond. The sediment pond is designed <br />to contain the runoff from a 10-year, 24-hour runoff event. The sediment pond <br />(Pond A) is also designed to contain two years of accumulated sediment. The <br />applicant has committed to sediment cleanout at the 60% sediment level as <br />indicated by a staff gauge in the pond. <br />
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