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• <br /> 2. Crushing <br /> The petitioner is proposing to conduct gravel crushing operations on this site,but <br /> no wash operation. Washing gravel is not necessary for hot-mix asphalt. He is <br /> uncertain at this time whether he will contract for the crushing or do it himself. <br /> Whoever does it will need to have a Minnesota Pollution Control Agency <br /> (MPCA) Air Emission Permit. <br /> Noise and vibration can also be problems associated with crushing operations. <br /> Anticipating where these issues will be problems can be hard to predict. Open- <br /> ended conditions are being proposed in the attached conditional use permit so that <br /> staff has latitude for dealing with unanticipated problems arising from the <br /> crushing. <br /> 3. Dust <br /> The majority of the problem with dust from gravel operations is associated with <br /> truck traffic. Staff is recommending that the petitioner be required to have a <br /> water truck on site at all times when mining activities are taking place. The <br /> attached conditional use permit also prohibits the use of calcium to hold dust <br /> down due to concern about it running off into adjacent wetlands and altering their <br /> pH. <br /> • 4. Hours of operation <br /> The petitioner is proposing excavation and associated activities only during the <br /> normal hours of operation allow by the city's ordinance (7 a.m. to 7 p.m., Monday <br /> through Saturday). This should reduce the potential for things like glare and noise <br /> (back-up alarms at night) from being an unreasonable annoyance to adjacent <br /> properties. However, the language in the attached CUP allows flexibility for <br /> dealing with these issues, if they become problems down the road. <br /> 5. Fencing <br /> Staff is recommending that fencing that provides a clear visual warning is erected <br /> around all excavation areas and that this fencing is not removed until an area is <br /> properly sloped. <br /> 6. Ground Water Protection <br /> The bottom of the proposed excavation on the site is an average of 40 feet above <br /> ground water, lessening concerns regarding contamination. Except for minor <br /> repairs, the petitioner has stated that maintenance of his equipment will be done at <br /> an indoor shop (with a hard surface floor) at the Elk River Bituminous site. In <br /> addition to a Storm Water Pollution Prevention Plan required by the state, staff <br /> recommends a Spill Prevention and Counter Control Plan be required. This latter <br /> plan is an aid to the Fire Department incase they have to respond to an incident at <br /> the site. It identifies such things as the location, amount and type of flammable or <br /> . hazardous materials at the site and spells out a protocol for dealing with different <br /> contingencies. <br />