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REQUEST 31PO COUNCIL ACTION DATE: 12/13/93 ITEM No. : Department A ro al; Manager Reviewed* Agenda section: CZ� Reports and Recommendations item Description* Authorization for city project for regional pond analysis and design for Twin Lakes redevelopment area Background: Development in the Twin Lakes area has been moving ahead rapidly during the past 1 months. cyan Development has constructed a project at the corner of Arthur Street and County Road C and plans additional redevelopment activities for 1 In conjunction with the redevelopment of the entire Twin Lakes area, it is necessary to consider a regional stormwater ponding facility. It is .necessary for this pond to be built to collect and accommodate stormwater from the redevelopment site, The pond should be sufficiently. sized to handle the volume from the completed redevelopment area. In addition, the pond should incorporate state of the art technology to provide p pre-treatment for stormwater prior to discharge into Langton Lake. In the development agreement with Ryan, the City has committed to completing this ponding area bar November 11 1995s This means that the design needs to be completed in early 1994 and- a contract let in late 1994, so the pond can be completed by the specified deadline. A letter of understanding to City officials is attached from Ryan Development's engineer outlining the responsibility and schedule for the regional pond. To provide the design services, it is necessary to retain a consulting engineering firma A complicated stormwat er management project of this nature is beyond the technical expertise of city staff. It is necessary to incorporate special expertise in the area of k�tormwater ponding design and stormwater treatment. Accordingly, w� have solicited proposals and examined qualifications from firms J n our current consulting ngineering pool. Orr, Pchelen, MayeLA,;: and Associates � � � v to :�.n�'e� �. of ponding areas of o (OSM) exhibits significant gn i f i cant experience in de e p re P g this nature. OSM is one of the three designated ve r resource consultants currently in the City's pools We have "Ot used 0 M for any work in the p ast but have used SEH and Barr for significant projects} Therefore, it is appropriate to consider OM for the project. In addition their principal water resources engineer, peter Willenbring, was the former engineer for the Rice creek Watershed District. His past experience provides OSM with the ability to Mork well with the Rice Creek Watershed District.