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2014-02-07_REVISION - M1979094HR
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2014-02-07_REVISION - M1979094HR
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Last modified
6/15/2021 2:30:06 PM
Creation date
2/13/2014 1:45:12 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1979094HR
IBM Index Class Name
REVISION
Doc Date
2/7/2014
Doc Name
Revised DDP/Technical Memorandum AM01
From
Whetstone Associates
To
DRMS
Type & Sequence
AM1
Email Name
DMC
TC1
Media Type
D
Archive
No
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Whetrtor7e <br />Assocratesw Technical Memorandum <br />d. 10 year, 24 -hour runoff volume ... The response is adequate. <br />Cotter response: Comment noted. <br />2. Stormwater hydraulic analyses or design drawings. The response is partially adequate. The <br />Drainage Design Plan appears to assume the ponds on site are empty at the onset of the 100 - <br />year, 24 -hour design storm. The DRMS design criteria for passing the 100 year design peak <br />flow through spillways is to assume the pond is full to the invert of the lowest gravity drained <br />outlet at the onset of the design storm (typically the spillway invert). The following items <br />need to be addressed: <br />a. Sediment Ponds: <br />i. Stage- storage table to compare with estimated runoff volume... The response is <br />adequate. <br />ii. Drawing(s) (to scale) with contours demonstrating pond capacity, spillway location, <br />and spillway erosion protection have NOT been provided with the exception of SCN on <br />Plate 3. Please provide these drawings for: <br />1. An improved capacity pit pool, <br />2. Catchment 001 B -A South, and <br />3. Catchment 001 B -A North <br />Cotter response: The pit pool has been redesigned to clearly demonstrate the ability to <br />contain the runoff from the 10 -yr 24 -hr storm. The upgraded pond will also contain the <br />100 -yr 24 -hr storm. For the purpose of the spillway design and velocity /scour analysis, <br />however, the pit pool was assumed to be full at the start of the 100 -yr storm and was <br />designed to pass the 42.19 efs peak flow. The pond freeboard, spillway location, and <br />spillway materials are shown on the design drawing, which is included as Plate 2 in the <br />revised Drainage Design Plan (DDP). The upgraded pond and spillway will be <br />constructed consistent with the JD -7 Pit Mine Drainage Design Plan Implementation <br />Construction Schedule to be issued by DBMS.. <br />Additional engineering drawings have been prepared for Catchment OO1B -A North and <br />Catchment OO1B -A South. The drawings provide more detailed contours and detailed <br />spillway design and protection than were provided previously. The sediment ponds are <br />assumed to be full at the start of the 100 -yr storm, and the overflow spillways are <br />designed as such. These specifications are provided as Plate 3 in the revised DDP. <br />iii. , please provide design drawings) and specifications showing embankment and <br />spillway designs necessary to reduce the potential for scour should the 100 yr design <br />storm pass through the ponds. <br />iv. Revise the hydrologic analyses assuming the sediment ponds are full to the invert of <br />the lowest gravity drained outlet at the onset of the design storm. <br />4149A.140207 3 <br />
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