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HYDRO25803
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HYDRO25803
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Last modified
8/24/2016 8:45:26 PM
Creation date
11/20/2007 5:55:17 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1978091UG
IBM Index Class Name
Hydrology
Doc Date
4/26/2007
Doc Name
Stormwater Managment Plan
From
Gault Group Inc.
To
Water Quality Control Division
Media Type
D
Archive
No
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Golden Wonder Mine <br />DRMS Mine Permit No M-1978-091 <br />Storm Water Management Plan <br />and approved in the 1997 CDPS -Stormwater Certification No. COR- <br />040199) before, Leve13 has been inactive since 1978. The Leve13 area is <br />not subject to stormwater tun-on because it is naturally diverted/absorbed on <br />the scree/taIus slope in which it resides. There has been no observation of <br />any run-on or run-off with Level 3, however in the interest or providing a <br />conservative stormwater plan, the Level 3 access road will be monitored to <br />determine the need for additional diversion features. Therefore, the <br />following describes the various stormwater diversions used for the Level 3 <br />access road and both the access road and pad for Level 6. <br />Stormwater diversions for the Access Roads: <br />• Run-on channels currently exist on the inside track of the access road <br />shoulders that are adjacent to the cut slope. These channels capture <br />stormwater sheet flow from the up-slope areas and route the water to <br />stormwater culverts. <br />• If needed, stormwater culverts will be placed under the access road surface <br />to capture run-on channel flows and route then to rip-rap baffles at the <br />culvert outfall. <br />• If needed, rip-rap Baffles will be placed at the culvert outfalls and <br />comprised of cobble to boulder sized rock which will significantly <br />diminish outfall water energy thereby allowing for particulates to settle <br />from stormwater flows <br />Stormwater diversions for the Leve16 Pad: <br />• Contouring of pad work surface has been in place and slopes the pad back <br />towards the cut hill slope. For the purposes of this SWMP, the Leve16 pad <br />will continue to maintain this `sloped' working surface on the pad outside <br />the portal. This contouring routes all drainage back towards the portal and <br />into the stormwater sump located on the pad. <br />• Berms comprised of mounted waste rock, exist along the outer perimeter <br />of the Level 3 and 6 pads to retain any water on the pads and route it back <br />towards the natural hill slope. Ditches at the toe of the cut slope then <br />capture these flows and route them into a stormwater sump located <br />adjacent to the portal. <br />• Revegetation measures: Native soil was retained as part of the mine plan <br />of operations and used to cover portions of the pad surfaces and waste <br />rock areas (tat are not in use) to enhance revegetation success. Currently, <br />7 <br />
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