8.1. SR 03-16-2015 - Laserfiche WebLink

Home Browse Search

i.Achieve at least 0.55” volume reduction from all impervious surfaces if the site is new development or from the new and/or fully reconstructed impervious surfaces for a redevelopment site. ii.Remove 75% of the annual TP load from all impervious surfaces if the site is new development or from the new and/or fully reconstructed impervious surfaces for a redevelopment site. iii.Options considered and presented shall examine the merits of relocating project elements to address, varying soil conditions and other constraints across the site. Alternative #2: Applicant Attempts to Comply with the Following Conditions: i.Achieve volume reduction to the maximum extent practicable. ii.Remove 60% of the annual TP load from all impervious surfaces if the site is new development or from the new and/or fully reconstructed impervious surfaces for a redevelopment site. iii.Options considered and presented shall examine the merits of relocating project elements to address, varying soil conditions and other constraints across the site. Alternative #3: Off-site Treatment: Mitigation equivalent to the performance of 1.1 inches of volume reduction for new development or redevelopment as described above in this section, (including banking or cash) can be performed off-site to protect the receiving water body. Off-site treatment shall be achieved in areas selected in the following order of preference: i.Locations that yield benefits to the same receiving water that receives runoff from the original construction activity. ii.Locations within the same Department of Natural Resource (DNR) catchment area (Hydrologic Unit 08) as the original construction activity. iii.Locations within the next adjacent DNR catchment area upstream. iv.Locations anywhere within the community’s jurisdiction. Impervious Surface Area Calculations shall include all disturbed/graded soil areas, due to soil compaction impacts, unless Soil Protection/Compaction Remediation specifications have been incorporated into the Proposal (Plan Set, Stormwater Management Plan, etc.) and are approved by the City Engineer. Designers shall be required to provide estimates of BMP-site specific infiltration rates to the City Engineer for approval prior to site plan review. For information on estimation of infiltration rates, see the Minnesota Stormwater Manual (http://stormwater.pca.state.mn.us). The MIDS Design Sequence Flowchart can be found in the Minnesota Stormwater Manual: http://stormwater.pca.state.mn.us/index.php/Flexible_treatment_options. All volume control practices and site design specifications shall conform to the current version of the Minnesota Stormwater Manual. b.Stormsewer sizing. All stormwater sizing must be sized according to the City of Elk River Engineering Design Standards Manual. Page 18