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<br /> <br />Feasibility Report Page 16 <br />Snelling Avenue North and County Road E - Street and Utility Improvements <br />City Project Number PW 20-0100 <br />a new pedestrian trail, would likely require the addition of Best Management Practices <br />(BMPs) such as bio-filtration, stormwater detention for discharge rate management, and <br />inline sediment/grit chambers. Section 5 includes a general cost estimate for these BMP <br />items. <br /> <br />Proposed roadway improvements for Alternative 2 (no addition of pedestrian trail) would <br />not create a significant amount of new impervious surface or concentrate runoff into storm <br />sewer point discharges. Rule C requirements do not currently apply to mill, reclamation and <br />overlay pavement projects. Section 5 does not include the additional costs for permanent <br />BMPs for Alternative 2. Temporary erosion and sediment control devices will be utilized <br />during construction in accordance with applicable NPDES permit and RCWD Rule D <br />requirements. <br /> <br />3.5 Utility Improvements: Area 2 – Intersection of Snelling Ave and County Road E <br />Sanitary Sewer <br />Based on the recent condition evaluation described in Section 2, the recommended sanitary <br />sewer improvements include installation of 250 feet of cured-in-place-pipe (CIPP) sewer <br />lining between MH 3-035 and 3-034 as well as between MH 3-033 and 3-034 as shown in <br />Appendix D. Sanitary sewer pipe between MH 3-034 and 3-038 is proposed to be removed <br />and replaced due to the highly deteriorated condition of the pipe. <br /> <br />Water Main <br />Recommended water main improvements within Area 2 include replacement of 620 feet of <br />12-inch diameter water main within the intersection and replacement of an additional 150 <br />feet of 6-inch diameter water main extending north with 12-inch water main to complete the <br />water main capacity improvements along Snelling Avenue North from County Road E to <br />County Road E2. <br /> <br />Drainage <br />Construction of a roundabout intersection improvement will require replacement of existing <br />storm sewer to reconfigure storm sewer inlets and conveyance pipes based on the geometric <br />design of the roundabout. Recommended improvements also include rehabilitation of <br />approximately 600 feet of existing storm sewer by installation of cured-in-place-pipe (CIPP) <br />lining as shown in Appendix D. The CIPP installation is recommended as a cost effective <br />method of repairing the pipe segments located outside of the intersection by avoiding <br />excavation required to remove and replace the pipes. <br /> <br />Storm water drainage design will need to meet Rice Creek Watershed District (RCWD) <br />requirements as outlined in Rule C. The project design will evaluate specific Best <br />Management Practices (BMPs) such as bio-filtration and inline sediment/grit chambers <br />placed before discharging into the downstream storm sewer system. Section 5 includes a <br />general cost estimate for these BMP items. Temporary erosion and sediment control devices <br />will be utilized during construction in accordance with applicable NPDES permit and RCWD <br />Rule D requirements. <br />