2004-05-26_REVISION - M1998052 - Laserfiche WebLink

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Adequacy of the CN-001 Application Mascot Placer May 26, 2004 Permit No. M-1998-052 Placer. Application and crimping of two tons per acre of weed free straw or native hay would further benefit reclamation by lessening rain drop erosion while plants become established.. 2. Fuel Storage The CN-001 application states that bulk fuel will be stored in tanks onsite well above the 100-yeaz flood flow. Flood flow calculations included in the Alpine Rock permit are referenced in CN-001, but these calculations have not been used to delineate the 100-year floodplain. Has the floodplain been delineated at this location, e.g., has a flood insurance rate map been produced? If not, how will the Operator determine where to locate the fuel tanks? Given the pervious subgrade at this location and the proximity to the river, the DMG recommends that the fuel tanks be bermed, the bermed area be lined with a UV resistant membrane, and that the bermed area be sized to accommodate 1.5 times the capacity of the tanks. The DMG further recommends that the Operator adopt a policy and install signage stating that the fuel valve be manned at all times during fueling. Lubricants, antifreeze and any other potential contaminants stored within the permit azea must be stored such that spills will be contained. Spill containment measures to be employed must be described and incorporated into the permit. 3. Waters of the United States During the public comment period for the CN-001 application, the Army Corps of Engineers provided comments stating that a Department of the Army permit would be required prior to any impacts to waters of the United States, including wetlands. In the CN-001 application, it is stated that no activity will take place in the river or wetlands with the exception of the future installation of a second culverted river crossing. It is stated in the CN001 application that the Corps of Engineers will be contacted prior to the installation of the second crossing. It is the DMG's understanding that there has been no wetlands delineation conducted at the Mascot Placer. During the DMG's preoperational inspection of the site, to be conducted on the afternoon of June 1, 2004, the potential for the proposed operations to impact wetlands will be evaluated. Unless it is obvious that there aze no wetlands in the proposed area of affected land, a wetlands delineation may be required. 4. Fugitive Dust It is stated in Exhibit M to the CN-001 application that one or more fugitive dust permits maybe required. Since there is an active 1101irnited impact permit, and since the Operator intends to progress mining into the acreage proposed for addition to the permit upon the approval of CN-001, the Air Pollution Control Division (APCD) must be contacted as soon as possible to determine what, if any, permit or notices will be required. Please report to DMG the findings and requirements of the APCD. 5. Reclamation Costs In Exhibit L to the CN-001 application the estimated cost for grading and slope reduction is listed as $1000.00 total. Please quantify the maximum number of acres that may require grading and the maximum length and height of working face that may require slope reduction at any point during the life of the operation. Bear in mind that these data will be used to estimate grading costs and establish the amount of required bond. As a result, the acreage and working face configuration provided in your