City Council Study Session Summary 2011 05 10

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City Council Study Session Summary May 10, 2011 Page 5of 6 conscious of completing any street work on garbage pickup days. There was a recent example of this where a trash truck drove down a street and caused some damage to the recently applied crack seal. Staff explained that due to the condition of the pavement and of the old chip seal, sections of the new crack seal and old chip sealhad indeed been pulled up. Update/Discussion –Downtown Drainage David Thompson, Senior Civil Engineer, presented information on two projects underway between the City and Urban Drainage and Flood Control. The first project is to improve the drainage facilities within Drainageway A-2 which is east and west of the railroad tracks. Funding for the project is shared 50/50 between the City and Urban Drainage. The project focuses on reducing the size of the flood plain in the downtown area. David presented 4 different alternativesfor diverting storm water in the event of a major storm event.The goal of Public Works staff is to move this project along and City staff will be coordinating with Boulder County and the City of Lafayette. There are obstacles in completing this project pertaining to possibly sending storm water into jointly owned open space, Harney Lastoka, and responding to concerns from Boulder County and Lafayette that the project is altering historic drainage. Other obstacles are that in selecting a final design, they may run into underground utilities or have to go deeper. Mayor Sisk asked staff to know what ramifications would be within the City limits, where is the flood plain now and how are we reducing the foot print? David confirmed the goal of the project is to eliminate the flood plain west of Highway 42. Planning Director Russ asked about the timing of this project as it relates to the Highway 42 Revitalization design and project. In response, David confirmed staff will press forward with the design and plans to have minimal impact on Highway 42 development. Public Works will work closely with the Planning Department on the timing of both projects. The second project, the Storm Drainage Design and Technical CriteriaManual is currently being updated. The updated manual will include a new drainage policy which addresses downtown redevelopment where no storm water detention facilities or water quality features currently exists. If the downtown area is given an exception to providing water quality features then it will fall upon the City to provide water quality mitigation prior to the water runoff reaching Coal Creek or the Open Space. There was a brief discussion that followed amongst Council and staff.