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Ms. Michele McPherson <br />April 25, 2000 <br />Page Two <br /> <br />B. Grading Plan <br /> <br />· There are several lots such as Lots 1 and 2, Block 2, which have very minimal <br /> buildable area within them. <br /> <br />· The center area created by the looped road has a wetland in the center of it. No <br /> elevations relative to the 100-year high water elevation are provided. Also, no' <br /> elevations or types of homes are provided on the building pads. This information <br /> needs to be provided for each lot. <br /> <br />· There is minimal grading shown in the plat. It appears that only the road itself is <br /> proposed to be graded. However, some of the ungraded lots appear to need <br /> additional grading. As an example, Lot 1, Block 1, where the house pad sits is <br /> approximately two feet below the road elevation. Is it the intent to leave this lot Iow <br /> and build below the road, or is it the intent to have it filled? <br /> <br />· The emergency overflows need to be identified and elevations labeled. <br /> <br />· There is at least some wetland filling required for the building of the cul-de-sac. <br /> There appears to be other areas where the road construction causes impact to the <br /> wetlands. There is no wetland mitigation or other wetland information provided with <br /> the submittal. <br /> <br />C. Utility Plan <br /> <br />The proposed community wastewater treatment plant generally will consist of a 2-cell <br />septic tank located on each lot. The first cell will collect solids. The second cell will <br />collect the remaining liquid and, by the use of a pump, will discharge the liquid <br />through a Iow pressure sewer line running along the street to a large settling tank <br />located at the community treatment facility. From the settling tank, the liquid will be <br />pumped into the treatment facility. There are no details and/or calculations provided <br />for the on-site treatment facility. These will have to be provided, reviewed, and <br />approved prior to any construction proceeding. <br /> <br />The drainage calculations provided are rather sketchy and need to be revised adding <br />additional information including the following: <br /> <br /> · Detailed information regarding high water elevations for all drainage facilities <br /> and additional information on the Grading Plan showing the lowest floors and <br /> types of homes relative to the drainage facilities. In all cases, the lowest <br /> opening in the homes needs to be one foot above the high water elevation. <br /> <br /> · Proposed mitigation for the wetland impact needs to be shown along with <br /> seasonal high water elevation for wetlands. <br /> <br /> · No drainage calculations were provided for the sedimentation ponds. These <br /> need to be provided showing normal water level and high water level for each <br /> pond. Sedimentation ponds should be designed in accordance with Best <br /> Management Practices for Urban Runoff as published by the MPCA <br /> Chapter 4. <br /> <br /> Howard R. Green Company <br /> CONSULTING ENGINEERS <br />O:\PROJ\809820j\0240\ltr 4-25-00 McPherson.doc <br /> <br /> <br />