6.2. & 6.3. SR 05-19-2003 - Laserfiche WebLink

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water truck on site at all times when mining activities are taking place. The attached conditional use permit also prohibits the use of calcium to hold dust down due to concern about it running off into adjacent wetlands and altering their pH. 4. Hours of operation The petitioner is proposing excavation and associated activities only during the normal hours of operation allowed by the city's ordinance (7 a.m. to 7 p.m., Monday through Saturday). This should reduce the potential for things like glare and noise (back-up alarms at night) from being an unreasonable annoyance to adjacent properties. However, the language in the attached CUP allows flexibility for dealing with these issues, if they become problems down the road. 5. Fencing Staff is recommending fencing to provide a clear visual warning be erected around all excavation areas and that this fencing is not removed until an area is properly sloped. 6. Ground Water Protection The bottom of the proposed excavation on the site is an average of 40 feet above ground water, lessening concerns regarding contamination. Except for minor repairs, the petitioner has stated that maintenance of his equipment will be done at an indoor shop (with a hard surface floor) at the Elk River Bituminous site. In addition to a Storm Water Pollution Prevention Plan required by the state, staff recommends a Spill Prevention and Counter Control Plan be required. This latter plan is an aid to the Fire Department incase they have to respond to an incident at the site. It identifies such things as the location, amount and type of flammable or hazardous materials at the site and spells out a protocol for dealing with different contingencies. 7. Storm Water and Wetlands None of the seven wetlands on the site are proposed to be altered due to the request for mineral excavation. Staff recommends a fifty-foot setback is maintained from wetlands to mining activity and that they are protected with silt fencing. As previously mentioned, staff recommends that calcium not be used to control dust on the site so it doesn't run into the wetlands, altering their pH. In addition, staff recommends all drainage from the excavated areas be directed through temporary sedimentation ponds prior to discharge off-site or to wetlands. The petitioner will be required to construct the sedimentation ponds in a way that does not deny any natural wetlands hydrology, consequently drying them up. Prior to operations commencing, the petitioner is required to obtain a National Point Discharge Elimination System Permit, which also deals with the issues listed above. Staff is to be in receipt of a final wetland delineation and storm water plan prior to Monday night and will update the Council as to their adequacy at the meeting.