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REV07942
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REV07942
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Entry Properties
Last modified
8/25/2016 1:08:40 AM
Creation date
11/21/2007 9:48:47 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981018
IBM Index Class Name
Revision
Doc Date
10/15/1996
Doc Name
DESERADO MINE C-81-018 TR 42 COMBINATION OF RP 2 3 AND RP 4
From
DMG
To
WESTERN FUELS UTAH
Type & Sequence
TR42
Media Type
D
Archive
No
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<br />8. The way that ditch segment 8, to Pond RP-4, and ditch segment <br />7, to Pond RP-2,3, are depicted on Map 150, it appears that there <br />is a gap between the two ditches through which disturbed runoff <br />could pass without being routed to either sediment pond. The map <br />needs to be amended to clearly indicate that all disturbed runoff <br />from the combined refuse area will be intercepted by a perimeter <br />ditch and directed to a sediment pond. <br />9. The revised narrative should be further amended to include <br />some discussion of the sequence of operations which will occur in <br />association with the joining of the two refuse sub-areas. we <br />assume that the initial step would be modification of the lower <br />drainage segments to direct disturbed drainage to the east inlet of <br />Pond RP-4 and the west inlet of Pond RP-2,3, followed by <br />preparatory grading and placement of compacted refuse lifts in the <br />available space between the two sub-areas. The narrative should <br />address the sequence of refuse placement in the valley, and <br />describe how proper drainage control will be maintained as the <br />valley area is filled in with refuse. <br />l0. Drainage plans and final contours for Refuse Area 2-3 and <br />Refuse Area 4 as depicted on Map 77 are being in effect replaced by <br />the plan for the combined Refuse Area 2-3 & 4, depicted on Map 150. <br />However additional information included on Map 77, regarding Refuse <br />Area 1, and various topsoil and non-toxic fill stockpiles is not <br />being replaced. Map 77 should be amended to depict the revised <br />contours for the combined refuse area, or the map should be amended <br />to include a statement directing the reader to Map 150 for the <br />approved final contours for the combined refuse area. Also, it is <br />noted that the current Map 77 was not certified when it was last <br />updated. The amended Map 77 will need to be properly certified. <br />11. On amended page IV-22, it is stated that, for nontoxic fill <br />stockpiles and topsoil stockpiles associated with the refuse <br />disposal areas, "a silt fence/culvert catch drain is installed at <br />the toe of the subsoil pile to drain the runoff collected from <br />precipitation events." However Maps 77 and 77A depict containment <br />berms only, without silt fence catch drains. The Division has <br />recently recommended that rock filter sediment control structures <br />as specified for various other small area exemption sites be <br />installed at these stockpile sites as well. We recommend that the <br />permit text and appropriate maps be amended accordingly. <br />
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