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CMI Technical Memo Page 2 <br />e.Per City requirements to track TMDLs and reduce loads to meet required Waste Load <br />Allocations, the calculations for Total Suspended Solids (TSS) and Total Phosphorus (TP) <br />loading should be provided. <br />Although TSS and TP calculations are not required by the MCWD, once the final stormwater treatment <br />facilities and management plan have been approved, we will provide the indicated calculations for use by <br />the City in TMDL tracing and load reduction. <br />f.Facilities necessary for the ultimate development (street construction, sewer, basins, etc.) <br />should be installed and the site mass-graded at the same time as street construction to <br />ensure all drainage ways, watersheds, and runoff management systems are constructed per <br />the approved Stormwater Management Plan and are sized adequately for proposed <br />improvements. <br />We will include notes to this effect in the final construction plans and in the phasing portion of the SWPPP. <br />2.Final Plans should include the following: <br />a.Grading, Drainage, and Erosion Control Plan <br />b.Street Construction Plan <br />c.Landscape and Restoration Plan <br />d.SWPPP meeting NPDES requirements <br />e.City Standard Details <br />These items are included in the latest plans and will also be included in the final plans. <br />3.The applicant will be required to obtain the following permits and provide a copy of any approvals <br />required prior to Final Plat approval: <br />a.Minnehaha Creek Watershed District (MCWD) <br />b.NPDES General Construction Permit <br />We are aware of the MCWD and MPCA/NPDES stormwater permitting requirements. The MCWD <br />permitting is underway as described above and in the SWMP. The MPCA/NPDES Construction <br />Stormwater permit will be completed closer to the date of construction. <br />4.Consideration should be given to platting the proposed road as public instead of private. North Arm <br />Lane south of the site is a public road, and this is an extension of that road. Also, it provides a much- <br />needed turnaround for this location. North Arm Lane is on the City’s Pavement Improvement Plan in <br />the next couple of years, and the entire road could be improved to a 24’ width to meet City standards. <br />In accordance with the comment, in the latest plans, the road is proposed to be platted as public rather <br />than private. <br />5.The required cul-de-sac radius is 40 ft for pavement and 50 ft for ROW. The proposed cul-de-sacs <br />adequately indicate radii of 45.7 ft and 50 ft accordingly. <br />It is noted that the cul-de-sac meets the indicated dimensional requirements. <br />6.The minimum radius allowed for a horizontal curve on a private or public residential street is 275’. <br />The proposed layout includes a 25’ radius curve after connection to the existing road. This radius is <br />too small for larger vehicles to traverse. The layout should be revised to provide a design meeting City <br />requirements. <br />The planned curve is being finalized to meet City requirements. Because the road will have low volume <br />and speed, a tighter turn radius may be acceptable if emergency vehicles can maneuver it. Turn radius <br />exhibits will demonstrate this. Alternatively, a two-connection cul-de-sac will be included. <br />163