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2021-12-07_REVISION - M2012032 (18)
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2021-12-07_REVISION - M2012032 (18)
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Last modified
12/7/2021 11:13:38 AM
Creation date
12/7/2021 11:02:43 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2012032
IBM Index Class Name
Revision
Doc Date
12/7/2021
Doc Name Note
Appendix 2: SWMP
Doc Name
Proposed Revision Materials
From
Ouray Silver Mines, Inc
To
DRMS
Type & Sequence
AM2
Email Name
LJW
THM
Media Type
D
Archive
No
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OURarS/LVER MINES <br /> 1. Runoff Curve Number (CN) <br /> Cover description CN Soil Type Area <br /> Mined Land, Disturbed (Poor) 87 C 2.83 <br /> CN (weighted): 87.0 <br /> Total Area: 2.83 Acre <br /> 2. Runoff <br /> Return Period: 10-Year <br /> Rainfall, P: 2.60 in <br /> Runoff, Q: 1.3952in <br /> Runoff Volume: 0.2758 Acre-Ft <br /> The available storage volume of Sediment Pond 1 is a minimum of 1.51 acre feet therefore the <br /> pond is adequately sized. <br /> Runoff Curve Numbers CN for Watershed Area Draining to Governor Basin Collection Ditch <br /> 0.5 acres <br /> Description Hydrologic Soil Group Area (acres) CN <br /> Disturbed Land Group C Soils 0.5 87 <br /> An area of 0.5 acres will drain to the discharge point for Pond 3 for the worst case disturbance <br /> of this site. <br /> The runoff rate for the half acre of land inside of the permit boundary in Governor Basin that <br /> does not have natural drainage is calculated below: <br /> By: T Jesse Date: 11/23/21 16:16:30 <br /> Location: Governor Basin <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Type Area <br /> Mined Land, Disturbed (Poor) 87 C 6.955 <br /> CN (weighted): 87.0 <br /> Total Area: 6.955 Acre <br /> 2. Runoff <br /> Stormwater Management Plan 161 P a g e <br />
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