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1990-10-05_GENERAL DOCUMENTS - C1981026
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1990-10-05_GENERAL DOCUMENTS - C1981026
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Last modified
1/14/2021 3:17:28 PM
Creation date
2/26/2008 3:18:00 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981026
IBM Index Class Name
General Documents
Doc Date
10/5/1990
Doc Name
Proposed Decision Phase II Bond Release Request for Canadian Strip Mine
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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PROPOSED DECISION - Canadian Strip/Phase II Bond Release <br /> October 1 , 1990 <br /> Page 2 <br /> III. EVALUATION <br /> On September 5, 1990, a Phase II Bond Release Inspection was performed at <br /> the Canadian Strip Mine. Cathy Begej led the inspection, and it was <br /> attended by Dennis Byrnes, OSM-Albuquerque, Dave Harr and Gene Dillashaw, <br /> Kremmling Office of BLM, Glenn Murdock, previous employee at Canadian <br /> Strip and Jerry Koblitz, Greystone Development Consultants, the <br /> permitting liaison for Wyoming Fuel Company. <br /> The first condition which must be met for Phase II Bond Release concerns <br /> erosional stability at a site, as defined by rule 3.03.1 (3)(b). A site <br /> should not contribute suspended solids to streamflow or runoff outside <br /> the permit area in excess of pre-mining levels, as determined by baseline <br /> data. Wyoming Fuel Company prepared a sediment loss analysis of the <br /> sediment generated from a 10-year, 24-hour storm event using the software <br /> package SEDCAD+, Version 3.0, and the Revised Universal Soil Loss <br /> Equation (RUSLE) sub-routine. Vegetative cover information was derived <br /> from baseline data from the reference areas and 1990 vegetation <br /> sampling. The operator divided the reclaimed area into three watersheds, <br /> coincident with the post-mining drainage and sediment ponds. The <br /> analysis was run using three soil types: a composite of SCS sieve <br /> analyses for soil types in the mine area; a composite texture from six <br /> soil samples taken in upland areas of the reclaim and a composite texture <br /> from two soil samples taken from sediment in the base of Ponds 1 and 2. <br /> All runs in all watersheds showed lower sediment generation in the <br /> post-mining situation, as summarized in Tables 1 , 2 and 3 (attached) . It <br /> should be noted that these results reflect erosion protection provided by <br /> both vegetative cover and total cover. At Canadian Strip, a wood chip <br /> mulch was applied which still covers the site. <br /> TABLE 1 : Summary of SEDCAD+ <br /> Results Using the SCS Particle Size Distribution in the Analysis <br /> Runoff Peak <br /> Mining Volume Discharge Sediment <br /> Watershed Situation (ac-ft) (cfs) (tons) <br /> 1 Pre- 2.06 12.61 12.8 <br /> 1 Post- 1 .90 15.26 3.3 <br /> 2 Pre- 1 .08 8.78 5.3 <br /> 2 Post- 1 .04 4.99 4.5 <br /> 3 Pre- 0.22 2.25 1 .1 <br /> 3 Post- 0.05 0.45 0.1 <br />
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