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Mr. Steve Rohlf July 16, 1997 Page Two envisioned in the future, depending upon the end land use of the property. This type of drainage facility is not uncommon in the City of Elk River. Many of the rural areas that are currently developed utilize on-site retention basins with no permanent outlet. 2. TRANSPORTATION The permit application indicates that dust will be controlled by bituminous paving of 221st Avenue from the entrance of the proposed pit to TH 169. From the drawing submitted, it appears that this distance would be between 700 and 1,000 feet. It also indicates that exit roads to the plant area will also be paved. We would suggest that the paving of 221st Avenue be to a MnDOT 10-ton design to limit City maintenance expenditures because of the anticipated heavy truck traffic. As you are aware, 221st Avenue was recently upgraded. Therefore, the existing gravel base should be reasonably good for paving operations, although it may take some fine tuning prior to paving. The permit application indicates that the site is expected to handle an average of 100 trucks per day. This would result in 200 trips per day into and out of the plant. As the permit application indicates, there currently are turn lanes in place on TH 169 to 221st Avenue. During the City's recent meeting with MnDOT personnel, we made them aware of this pending application and the desire for northbound and southbound acceleration lanes. We • would suggest that as part of this application, the applicant pursue the construction of these acceleration lanes with MnDOT. If you have any questions regarding these comments or would like further analysis of other issues, please call. Sincerely, Howard R. Green Company /�G�'Glilvc� Terry J. Maurer, P.E. TJM:tw o:\proj\800720J\720-1606.j u I • Howard R. Green Company CONSULTING ENGINEERS