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OVERALL OPERATION The site being considered in this request will be used to process material mined from all • of Aggregate Industries's properties lying west of Highway 169. Some of the properties involved will be the subject of future conditional use permit requests. Aggregate Industries's application contains a map of their current and future mining operations (see "Overview Map" in the attached application). The exception to this is their current mine on the Nemeth property. Aggregate Industries is proposing to use conveyors to bring materials to this property, which will be considered in a future request. Their facility for maintenance that can't be done in the field, is on the east side of Highway 169 and is on the attached"Overview Map". This shop is covered under a previous conditional use permit TRAFFIC Aggregate Industries is proposing to temporarily use 213th Ave. to access US Trunk Highway 169. This intersection has protected turn lanes, but does not have acceleration lanes. Staff recommends that Aggregate Industries direct their traffic south via Co. Rd 77 to the altered Highway 169/Co. Rd. 33 interchange, when it is completed. It is anticipated that this new interchange will be complete in 2004. For the majority of the time from now until then, Aggregate Industries will still be mining the Nemeth property and using its access. If, for some unforeseen reason, the new interchange at Highway 169/Co. Rd. 33 does not materialize, staff recommends that Aggregate Industries be required to petition the Minnesota Department of Transportation to have acceleration lanes added to the 213th Ave./Highway 169 intersection. • GROUND WATER Aggregate Industries's wash operation will utilize a great deal of water. To minimize the effects of this operation on the water table, they use a two celled pond system. Water used to wash gravel is directed to the first cell where sediment is allowed to settle out. The overflow from this cell then proceeds to a second cell where the water is recycled back into the wash operation. This system greatly reduces the amount of water that needs to be pumped out of the ground for the wash operation. A pump test that was done as part of the city's EIS on Mineral Excavation and our experience from the drought of the late 1980's, revealed that residential wells in this area may be stressed by the appropriation of large amounts of water. The attached conditional use permit (CUP) contains language to avoid this problem, including a requirement to curtail wash operations if necessary. The attached CUP also contains additional testing requirements regarding groundwater. HOURS OF OPERATION Aggregate Industries are requesting to operate outside of the normal hours of operation, which are 7:00 a.m. to 7:00 p.m., Monday through Saturday. They are requesting that their hours of operation are from 6:00 a.m. to 2:00 a.m., which are the hours they are currently allowed to operate at the Nemeth pit. In other locations within the city, Aggregate Industries has demonstrated their ability to mitigate negatives effects associated with their operations. The CUP includes remedies, if these hours prove to be an annoyance to surrounding properties. However, the proposed operation is extremely • close to the residences to the south of their property. Staff is unsure whether or not