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" " Permit Table <br />Permit <br />Agency <br />Timeline to Approval <br />Federal <br />Section 404 NWP 27 <br />US Army Corps <br />60-90 days <br />Local <br />Rice Creek Watershed <br />District Permit <br />Rice Creek Watershed <br />District <br />40 days <br />Wetland Conservation <br />Act No Loss <br />Rice Creek Watershed <br />District <br />60 days <br />9.0 Concept A <br />Concept 4 would consist of improvements largely focused on water quality benefits. <br />Improvements would involve construction of an iron -enhanced sand filter (IESF) to <br />treat the currently untreated runoff from Totem Tr., Hokah Dr., and Rice Ct., west of <br />Shenandoah Park. This concept is proposed in conjunction with Concept 3, but it <br />could also work in a modified capacity on its own or with Concept 1 or 2. All <br />removals, floodplain benefits, and cost estimates factor in Concept 3 base elements <br />and the IESF. <br />As proposed, the IESF BMP would cover approximately 5,000 square feet with a <br />basin bottom elevation of 887.4 feet. This elevation is based on a slightly raised <br />invert of the outlet pipe for drainage coming off the roadway. Incoming stormwater <br />would gravity flow through the filter media and outlet to the ditch via draintile. The <br />manhole upstream of this outlet pipe is proposed with a 3 feet sump to provide <br />pretreatment prior to flows reaching the IESF. <br />Shenandoah Improvements Feasibility Report <br />City of Lino Lakes, MN <br />WSB Project No. 018901-000 <br />Page 16 <br />