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GENERAL36825
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Last modified
8/24/2016 7:57:12 PM
Creation date
11/23/2007 8:53:24 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981034
IBM Index Class Name
General Documents
Doc Date
6/16/1999
Doc Name
PROPOSED DECISION & FINDINGS OF COMPLIANCE FOR SL2
From
Full Phase II & III
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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7 <br />area had been properly constructed and covered with four feet of non-toxic cover in compliance with <br />permit requirements, the remainder of the disturbed area had been regraded to approximate original <br />contour, the approved permanent drainage channel had been properly constructed, and that the <br />reclaimed area was stable. Inspections since that time have affirmed these findings, and the area <br />remains stable. <br />Topsoil Replacement Thickness <br />Due to the fact that the entire minesite had been disturbed by pre-law mining activity, topsoil was not <br />available for salvage and was not replaced as a part of final reclamation. The best available material on <br />site was used for plant growth medium, with coaly material buried or disposed of in the underground <br />development waste disposal site. A minimum of four feet of non-toxic cover was placed over the <br />compacted development waste prior to seeding. This material was largely comprised of spoil from the <br />pre-law strip pits. The Phase I bond release decision references DMG documentation of cover placement <br />thickness, and the permit application contains a final construction certification by a registered <br />professional engineer documenting that the refuse pile was constructed in accordance with permit and <br />regulatory requirements, including cover material placement. No bare areas of significant extent, areas <br />of stunted vegetation, salt crusts or discoloration, or other apparent indications of the presence of <br />chemical or physical soil characteristics inhibiting plant growth, were observed during the inspection. <br />Revegetation <br />Because the surface disturbance area associated with the Red Canyon Mine had been extensively <br />disturbed by pre-law surface coal mining and surface activities associated with underground mining, the <br />site qualified for the revegetation success criteria of Rule 4.15.10(1), for previously mined areas. The <br />rule requires that, for "previously mined areas that were not reclaimed to the requirements of these Rules <br />as a minimum ground cover of living plants shall not be less than can be supported by the best available <br />topsoil or other suitable material in the reaffected areas, shall not be less than the ground cover existing <br />before redisturbance, and shall be adequate to control erosion." <br />When the mine was permitted, a standard of 23% non-noxious, perennial vegetation cover, was <br />established, based on sampling conducted in 1983 within a sagebrush vegetation community within the <br />permit area, in the vicinity of the disturbed area. It was determined that compliance with this standard <br />would satisfy the criteria of 4.15.10(1). Originally, a species diversity standard was specified in the <br />permit, but elimination of the diversity standard was subsequently approved by the Division due to the <br />fact that 4.1 x.10 addresses only "ground cover of living plants". <br />Vegetation sampling on the reclaimed area was performed by a consultant to the operator in 1991, 1992, <br />1997 and 1993. The 1992 data was the basis for the operator's successful demonstration that sediment <br />concentrations from disturbed area runoff would not exceed pre-mine levels. The 1997 and 1998 <br />sampling was conducted to demonstrate compliance with the revegetatiun success standard during the <br />final two years of the 10 year bond liability period, as required by Rule 3.02.3(2)(6), and 4.1.7(5). <br />
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