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Page 4 <br /> • water the haul roads more frequently. In addition, a sand pile on the north <br /> end of the property has been vegetated, which appears to be of further <br /> benefit. <br /> An air quality permit will be required of this operation in the future. <br /> Northern Con-Agg has made the appropriate application for that permit. <br /> NOISE/HOURS OF OPERATION <br /> Northern Con-Agg has indicated that they only wish to operate during the <br /> hours that are currently allowed by the City Ordinance, which are 7:00 a.m. <br /> to 7:00 p.m., Monday through Saturday. To further help control noise, the <br /> strategic placement of equipment will be implemented. An example of this <br /> would be having crushing and screening operations stay close to an excavated <br /> bank which will deflect the noise away from adjacent residential dwellings. <br /> Placement of stock piles will also be used. <br /> Although there are not a large number of residential dwellings in close <br /> proximity to Northern Con-Agg's operation, noise can be hard to predict and <br /> houses much farther away than anticipated can be affected. Staff will need <br /> the authority to deal with these issues, if and as they arise. <br /> • SHOP <br /> The shop associated with this request is an existing support facility for the <br /> mining activities. The shop has the appropriate MPCA hazardous waste <br /> generators license for the typical materials used. Northern Con-Agg is also <br /> currently recycling the appropriate items from this shop and properly <br /> disposing those items which cannot be recycled. Staff is recommending that <br /> any storage associated with this facility either be indoors or screened. Having <br /> a shop facility such as this for a mining operation, is to the advantage of the <br /> City. A shop allows maintenance of equipment to take place indoors on a <br /> concrete floor so that fuels and other fluids are not spilled on site. <br /> GROUNDWATER MONITORING <br /> Attached to this memo is a memorandum from B.A. Liesch and Associates <br /> dated March 15, 1995, regarding ground water concerns and testing. <br /> Northern Con-Agg has indicated in their application that they anticipate the <br /> bottom of their pit to be 10 feet above ground water. However, if the <br /> materials and the market are favorable, they may excavate below the water <br /> table using a drag line or dredge. Mining in exposed ground water increases <br /> the concerns for water contamination. The conditions found later in this <br /> memo regarding the frequency of testing and other contamination <br /> s:planning:pc:95-04 <br />