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2008-04-21_HYDROLOGY - M1978091UG
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2008-04-21_HYDROLOGY - M1978091UG
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Last modified
8/24/2016 3:28:18 PM
Creation date
8/11/2008 9:51:26 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1978091UG
IBM Index Class Name
HYDROLOGY
Doc Date
4/21/2008
Doc Name
Revisions for S.W.M.P.
From
Gualt Group, Inc.
To
Water Quality Control Division
Email Name
RCO
Media Type
D
Archive
No
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the Level 6 portal was deemed more suitable. Both portals are marked by waste <br />dumps, the upper or Level 3 dump covering an acre and the lower or Level 6 <br />dump covering about 1.5 acres. The surface activities relative to the mine occur <br />on these dumps except for haulage which is over the roads. None of the dump <br />areas or access roads are surfaced. There are three temporary buildings on Level <br />6 that serve as a storage building (small locked traileribuilding), a semi-open <br />workshop and an outhouse. A small primary crusher, plus vehicles for ore <br />recovery are also stored on the Level 6 pad. <br />Mining is accomplished by underground stope method which involves drilling <br />and blasting and removing ore and waste with trackless equipment through the <br />portal. The waste is dumped down slope to the south and west of the portal. Ore <br />is stock piled, crushed through a primary crusher on-site and hauled out by truck. <br />An estimated maximum of 375 tons of waste and 125 tons of ore is permitted to <br />be produced each month, a total of 6,000 tons per year. <br />The Level 3 portal is established in a scree or talus slope which is porous and very <br />permeable so that no surface runoff occurs. There is no historic observation or <br />erosional evidence to suggest stormwater concerns are present. <br />The Level 6 portal is established in colluvium which is also extremely porous and <br />permeable. Deadman Gulch, an intermittent tributary borders the south side of <br />the Level 6 pad. The Level 6 setting is on a south and west facing slope where <br />the wind and sun ordinarily keep it clear of most of the snow. Very little runoff <br />has been observed on these slopes. <br />2. Area Subject to Effluent Limitations Guidelines <br />The permit boundaries associated with the mine are shown within Figure 1. There <br />are mine site features and an access road associated with each Level. As <br />previously mentioned, there is no runoff from the Level 3 area and it is currently <br />inactive. The Level 6 area has the potential for stormwater discharge as observed <br />from erosion along the access road. Stormwater flows associated with the road <br />and pad are controlled and managed in order to prevent a hydrologic connectivity <br />to Deadman Gulch along the south side. <br />Deadman's Gulch is an intermittent tributary to the Lake Fork of the Gunnison <br />River. Flows occur haphazardly for about two months during spring melt. These <br />flows have never demonstrated a direct connectivity to the Lake Fork of the <br />Gunnison as they dissipate into alluvium adjacent to a crossing with Colorado <br />Highway 149. <br />3. Site Map(s) <br />Three site maps are included with this SWMP; Figure 1 provides an aerial photo <br />with the various stormwater best managed practices (BMP) implemented for the <br />mine as well as a site layout for level 6, Figure 2 depicts a conceptual cross <br />section the of access road and a conceptual detail for a roll and dip water bar <br />BMP, Figure 3 depicts a conceptual cross sections of the Level 6 pad and Level 6 <br />access road. No runoff has been observed with Level 3, however in order to <br />address any potential flows routed from up-slope areas on to the access road (and <br />ultimately on to the Level 3 pad) a run-on channel with an associated stormwater <br />roll and dip water bar and baffle will be planned if needed. These controls will <br />Page 5 of 16
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