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L CITY COUNCIL AGENDA ITEM 6A STAFF ORIGINATOR: Michael Grochala MEETING DATE: September 14, 2015 TOPIC: Consider Resolution No. 15-93, Authorizing Report on Improvements, NE Area Drainage Study VOTE REQUIRED: INTRODUCTION 3/5 Staff is requesting council authorization to retain WSB & Associates to prepare a feasibility report for the proposed NE Area Drainage system. BACKGROUND The City Council authorized preparation of the NE 35E Area Drainage Study in November of 2012. The purpose of the study was to evaluate options to address drainage for a 700 acre area lying NE of the 35E interchange. The majority of this area drains to County Ditch 55, under 35E and ultimately to Clearwater Creek. Land within this area is poorly drained with clay soils that have minimal infiltration capacity. Additionally, the tile line (Ditch 55) that conveys water from this area was constructed in the early 1900's for agricultural purposes. The size of the tile ranges from 10 to 15 inches and does not have the capacity to carry new runoff from developing properties. The initial conceptual plan submitted to the Rice Creek Watershed District (RCWD) proposed the construction of a new storm sewer line running south to Clearwater Creek. However, after further review, a rd alternative was developed that would 1) address a surface water management over a larger drainage area, and 2) avoid issues related to possible increased flow volumes to Clearwater Creek. The proposal would provide a new outlet directly to Peltier Lake and provide an improved drainage outlet for nearly 1,400 acres while creating a high value greenway system, as proposed in the Comprehensive Plan, and improving water quality entering Peltier Lake. In July of 2014 the City Council authorized the expanded scope of the drainage study to incorporate the entire 1,400 acre drainage area and to prepare a Comprehensive Stormwater Management Plan for review and approval of the RCWD. City staff submitted the draft NE Area Comprehensive Surface Water Management Plan (CSMP) to the RCWD in June of 2015 for review and comment. A technical memorandum from the RCWD was received on July 9, 2015. The RCWD has requested additional information as part of the approval process. These requests have been incorporated into a proposal from WSB & Associates to complete a feasibility report for the project. The purpose of the report is to: