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• Mr. Steve Wensman <br /> November 18, 1999 <br /> Page Two <br /> 4. The remaining drainage from the development is proposed to be channeled to two <br /> locations. Slightly less than half of the street drainage will be conveyed to the center of <br /> Outlot A. After development there will be only a slight increase in drainage to this area <br /> for a 100-year storm amounting to approximately 0.5 foot increase in water depth. The <br /> remaining portion of the plat will be conveyed to a pond to be constructed in the <br /> southeast corner of the development. This pond has no outlet and according to the <br /> drainage calculations submitted has been designed adequately for this type of <br /> installation. <br /> 5. Emergency overflows from the low points in the street should be clearly noted on the <br /> grading plan. <br /> 6. We question the amount of inlet capacity at the intersection of 212th Avenue and Ironton <br /> Street. We believe two additional catchbasins should be added. <br /> C. Street Plans <br /> 1. The street section shown on the plans is adequate. It is proposed to be a rural style <br /> street 32 feet wide with bituminous burm on either side. <br /> 2. There is a series of trails proposed through Outlot A and B in the development. There is <br /> no typical section provided to indicate what the construction material of the trail would <br /> be. <br /> 3. There is a right turn lane proposed to be constructed along CSAH 1. The proposed <br /> • section for this right turn lane appears to be rather minimal with only 2 inches bituminous <br /> on top of 4 inches of aggregate base. This should be reviewed and approved by <br /> Sherburne County. <br /> D. On-Site Sewage System <br /> 1. The preliminary sewage collection and disposal plan indicates that there is more than <br /> adequate space provided in the development to build the on-site treatment facility. The <br /> preliminary evaluation of the design of the treatment facility indicates that the total flow <br /> will be less than 10,000 gallons per day. We are verifying with the MPCA, but it is our <br /> understanding that the review and approval for on-site clustered systems less than <br /> 10,000 gallons per day would be by the City rather than the MPCA. We are working with <br /> Randy Thorson of the MPCA to determine what the design criteria should be relative to <br /> gallons of flow anticipated from each home and the design of the on-site treatment <br /> facility. <br /> If you have any questions regarding any of these comments please call. <br /> Sincerely, <br /> Howard R. Green Company <br /> te2a <br /> • Terry J. Maurer, P.E. <br /> O:\PROJ\808540j\Itr 11-18-99 wenSmairWarC R Green Company <br /> CONSULTING ENGINEERS <br />