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BOLTON <br />i 1.f <br />8c M E N K <br />Real People. Real Solutions, <br />September 21, 2016 <br />City of Orono <br />Attn: Adam Edwards <br />PO Box 66 <br />Orono, VIN 55323 <br />RE: Proposal for Ferndale Marsh Drainage Study <br />Dear Adam: <br />2638 Shadow Lane <br />Suite 200 <br />Chaska, Mfg 55318-1172 <br />Ph: (952)448-8838 <br />Fax: (9521448-8805 <br />Bolton-Menk.com <br />As requested, we have prepared a scope of services and fee estimate to develop potential drainage <br />improvement options for the Ferndale marsh area. <br />Scope of Work <br />Task i — Assess current Stormwater Management System <br />• Perform site investigation of existing Stormwater Management System (i.e. pipes, ditches, ponds, <br />and wetlands) within study area. <br />• Review City's Surface Water Management Plan and applicable record street and utility plans. <br />• Review LIDAR topographic mapping to determine drainage patterns in the general area. <br />Delineate watersheds and define watershed characteristics for the existing stormwater <br />management system within study area. Characteristics shall include impervious surface <br />percentage, time of concentrations, areas, and soil types. <br />Define conveyance and basin characteristics for the existing stormwater management system <br />within study area. Conveyance characteristics shall include type, geometry, invert elevations, <br />slope, and roughness. Basin characteristics shall include normal water level, flood volume, and <br />outlet control design. <br />• Generate an Existing Drainage Area Map for the study area. <br />• Generate hydraulic model of existing conditions to determine peak flow rates, runoff volumes, <br />and high water levels. <br />Task 2 — Develop potential drainage improvement options <br />• From information generated in Task 1, develop a minimum of three potentially feasible drainage <br />improvement options. <br />• Generate a Proposed Drainage Area Map for the study area depicting potential drainage <br />improvement options. <br />• Generate hydraulic model of potential drainage improvements to determine effects on peak flow <br />rates, runoff volumes, and high water levels. <br />• Prepare a letter report discussing advantages and disadvantages of potential improvements, <br />including engineer's estimates of probable costs. <br />• Coordinate and meet with City as necessary to review and discuss current conditions and <br />potential improvements. <br />H:\0RN0\C131=1227\Ferndale Marsh Praposal.docx <br />Boiton & Menk is an P. .-.mi nppnrWni'y-mplaywr. <br />