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JUly 8, 1977 Page 2 5. Lowering of the existing contours will tend to minimize anticipated problems with water pressure in the development. The city engineer has indicated that the existing water pressure in the area could not adequately serve buildings constructed at existing elevations. In keeping with the objectives outlined above, a special use permit is desired so that material can be placed on the current market. Reservations of Planning Commission members regarding the possibility of problems from heavy truck traffic have been considered. In order to minimize the traffic problem the Special Use Permit is being requested for a five year period. The specific response to questions raised at the June 21,1977 Planning Commission meeting are as follows: MINING OPERATION 1. Ramsey County has imposed specific requirements on trucks using Silver Lake Road and County Road E. These are outlined in the attached memo- randum and include prohibitions against left turns from or to Silver Lake Road, clean up, signage etc. They have indicated that the additional number of trucks should pose no problem on either route as the traffic count is well below the designed capacity. 2. Excavating contractors and state and county officials have all indicated that dust control on the site using calcium chloride is very effective. It is used by the Minnesota Highway Department on nearly all construction projects and is considered cleaner and more effective than wetting the roads. They have also indicated that there should be no problem with blowing dirt from either the digging or the moving trucks because the material is naturally moist and the truck boxes are larger than load restrictions permit. 3. The City of Fridley has indicated that they encountered no significant problems in removing over two million yards in about twenty months from the recently completed switching yard. A very large amount of this dirt was hauled into residential areas. It is assumed that with the proper controls, few problems should develop when about one third of this amount is moved over a longer period as projected. A memo concerning this project is attached. 4. Based on the removal of 800,000 cubic yards, 12 yard dual-axel dump trucks, eight-hour days, 200 days per year and a five-year period, the operation would generate approximately 8.33 trucks per hour, or one vehicle every 7.5 minutes. It is assumed at least part of the hauling will be 21 yard belly dump units which would reduce the frequency even more. It is also assumed that there woul d be peri ods of more intense acti vity when thi s density might double. Even when doubled, the density is a low number of trucks per hour. 5. The Rice Creek Watershed has requested that the excavation start from the center of the site to insure a water flow away from the streets. This will be done with the central pond area being excavated in advance of the perimeter. It is proposed that the excavation for site preparation will