Item 5.1 - 5.2 - Laserfiche WebLink

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• 2. Crushing The petitioner is proposing to conduct gravel crushing operations on this site, but no wash operation. Washing gravel is not necessary for hot-mix asphalt. He is uncertain at this time whether he will contract for the crushing or do it himself. Whoever does it will need to have a Minnesota Pollution Control Agency (MPCA) Air Emission Permit. Noise and vibration can also be problems associated with crushing operations. Anticipating where these issues will be problems can be hard to predict. Open- ended conditions are being proposed in the attached conditional use permit so that staff has latitude for dealing with unanticipated problems arising from the crushing. 3. Dust The majority of the problem with dust from gravel operations is associated with truck traffic. Staff is recommending that the petitioner be required to have a 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 allow 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 that fencing that provides a clear visual warning is 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.