2001-08-23_AgendaPacket - Laserfiche WebLink

Home

Motion: Jack Frost moved, Roger Lake seconded, to authorize staff to execute the remaining construction documents with Lametti & Sons for the Beltline Interceptor Outfall Relief Project. Motion carried. Beltline Development Policy Memo dd 7/6/Oi Discussion was held on Ban's memo, which provides a cursory review of the existing Beltline model to assist the Board in considering a development policy to restrict additional flows from entering the system in an effort to avoid overtaxing the 75-year old system. Recommendations were made to limit flows from redeveloped commercial sites directly tributary to the Beltline. In an effort to gain a better understanding of the overall impacts of zoning and redevelopment tributary to the Beltline, staff requested authorization to report back in another month or two on their general findings related to: • a cursory analysis of the effects of volume increase on the structural integrity of the Beltline. • the effects of changes ih the general redevelopment of residential areas tributary to the Beltline. The existing Beltline model does not include data from tributary drainage areas, whereas the Phalen Chain of Lakes and Beaver Lake models do. Cliff pointed out that this missing data is the only real gap in the District's 100-year flood level figures, and he felt that this data would tie in nicely with the next Watershed Management Plan revision. The memo also makes recommendations about the benefits of using a more sophisticated hydraulic model to give a better understanding of the optimum timing of inflows entering the Beltline, which may help with capital improvement planning along the system to maximize the efficiency of the entire Beltline system. Board consensus was to direct staff to develop a proposal outlining the recommended elements, benefits, costs, and timeline. Roger Lake would like to see some benefits- outlined on how this data might assist other entities guide their future redevelopment plans as well. Memo on Enaineerine Costs Related to Beltline Interceptor Repair and Outfall Capacity dd 7/5/01 Discussion was held on Barr's memo, which summarizes engineering costs of the entire Beltline project to-date. Cliff commented that the additional engineering expenditures in the early phases of the project actually represent an up-front investment of time and effort, ultimately reducing the total project costs. Project 1 - PFS Project Monitoring Cliff reported on the need to make inlet pipe,. modifications because standing water in the system interferes with the collection of accurate flow measurements. This is an example of monitoring difficulties that arise when innovative projects like this are undertaken. Phase 2 Oakdale Area Improvements Staff will likely abandon the project in the northerly wetland area due to the costly mitigation requirements that are expected to be imposed by the US Corps of Engineers. Efforts will instead be focused on improving the downstream wetland for water quality, the. pipe extension, channel stabilization, and erosion repair in the downstream BC-75 drainage area. The Board had no objections to staff pursuing this change in plans. Suburban Avenue Pond Pipe Alternative Evaluation dd 7/11/01 The Board received copies of Barr's memo outlining repair alternatives for a sinkhole that developed around the pipe as reported at the May 2 meeting. It will be placed on next month's agenda for discussion. Cliff noted that although it will be one of the larger expenses, it will be treated as a CIP Maintenance & Repair item for next year. Page 3 July 11, 2001 RWMWD Minutes