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2004-03-08_REVISION - M1998052
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2004-03-08_REVISION - M1998052
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Entry Properties
Last modified
6/15/2021 11:01:06 AM
Creation date
11/21/2007 11:43:03 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1998052
IBM Index Class Name
Revision
Doc Date
3/8/2004
Doc Name
Conversion Application
From
Everist Materials LLC
To
DMG
Type & Sequence
CN1
Media Type
D
Archive
No
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Exhibit G <br />Water Information <br />The Everist Materials Mascot Placer Operation is located in the Swan River <br />Basin. The operation is not expected to directly affect surface or groundwater <br />systems. Mining of the placer tailing will entail removal of the tailing to <br />approximately 1.5 to 2.0 feet (vertical) above the water table. <br />The Affected Land consists of dredge mining spoils (tailing). As such, the <br />area is on the valley floor and the Swan River (quite a small creek at this elevation) <br />runs adjacent to the site. The Swan River was disturbed by historic mining from <br />above this site all the way to the 81ue River (about 5 miles). There are no other <br />ditches, reservoirs, or ponds that would receive drainage directly from the Affected <br />Area. <br />The operation will adhere to all applicable State and Federal water quality <br />and water quantity laws and regulations. We are cognizant of the potential <br />phosphorus problem in Dillon Reservoir. No chemicals will be used at this site. <br />There will be no discharge from the operation; therefore, no NPDES Permit will be <br />required. <br />100-year flood calculations for the site were done for the Alpine Rock <br />application. Those calculations indicate the 100-year flood depth to be about 3.26 <br />feet above the normal flow. As such, some water might barely overtop the <br />perimeter berm and flow across the site during a very major flood event. <br />However, the depth and velocity of even that flood across the site would be <br />minimal because the excavation of material will increase the conveyance capaclty of <br />the river by providing additional overbank area. Therefore, flood elevations and <br />velocities would be lower than those calculated for historical conditions. <br />The operation will not require or use water. Therefore, no water rights are <br />required for the operation. <br />Potential contaminants from such an operation are sediment, fuel, oil, and <br />grease. As indicated in the Mining Plan, a Stormwater Permit is in place for the site. <br />Erosion of the site is highly unlikely because of the coarseness of the material. The <br />coarseness of the material minimizes the possibility of stormwater flowing from the <br />site. However, as indicated in the Mining Plan, a small berm of tailing will be kept in <br />place around the perimeter of the Affected Land where stormwater flow might be a <br />problem. <br />Any fuel stored on the property will be stored aboveground, and such fuel <br />storage will have an approved Materials Containment Plan in place. Equipment <br />will be stored in one central area where it will be much easier to control potential <br />contamination from oil leaks, etc. Oil and grease from equipment will be controlled <br />with the aid of drip pans and mats. All waste oil will be hauled from the property <br />and disposed of at a licensed facility. <br />As indicated, the Swan River (a small creek at this elevation) flows around <br />and through the tailing and the edges of the river might lie classified as wetlands. <br />No mining or filling will occur in these areas. Therefore, no wetlands permit from the <br />10 <br />
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