City Council Agenda and Packet 2010 10 05

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Selected Plan: Lafayette- Louisville Boundary OSP * ** D FT * ** Selected Plan for the Lafayette - Louisville Boundary Outfall Systems Plan Conceptual Design Report July 19, 2010 The Selected Plan for the Lafayette - Louisville Boundary area agreed upon by the City of Lafayette (Lafayette), the City of Louisville (Louisville) and the Urban Drainage and Flood Control District (District) (hereinafter Lafayette, Louisville and District shall jointly be referred to as "Sponsors ") to be shown by McLaughlin Water Engineers, Ltd. (McLaughlin) in the final Lafayette - Louisville Boundary Outfall Systems Plan Conceptual Design Report (hereinafter called "Final Report ") is described in general and specific terms below. SELECTED PLAN AND DIRECTLY RELATED ISSUES Unless specifically directed otherwise belo this Selected Plan to be shown in the Final Report essentially follows the recommendations made by McLaughlin in the Lafayette - Louisville Boundary Outfall Systems Plan Phase A Alternatives Analysis Report, dated April 2010 (hereinafter called "Phase A Report ") based on the following principal elements, goals and objectives: • Minimize stormwater and flood - related damages to drainageways, public infrastructure and private property. Do this with value engineering and practicalities of implementation in mind. • Institute an approach that balances the development in the watershed with stormwater management implementation that complements drainageway and stream stability solutions, that as a system, provide multiple benefits that include: o Water quality protection and enhancement; o Water quantity resources protection; o Preservation of natural character of the waterways and their terrestrial and aquatic habitat resource; o Wherever possible, provide public use and access and/or trails within the corridors of identified waterways in order to provide maintenance access that will also provide for active and passive recreation of the public. • Consider the needs for new and upgraded roadway crossings when such improvements are practicable, affordable and add significant value in relation to the cost. McLaughlin is asked to address all items that are to be addressed in the Final Report as described in the agreement between District and McLaughlin for this project, as well as develop, describe and show a conceptual design based on the Recommended Plan in the Phase A Report, with the following exceptions: 1. Remove the proposed Coal Creek Station Pond from Drainageway 7 -1, using the peak flows at the Highway 42 crossing as shown in Alternative 1A. 1 40