01-08-07 Full Agenda Packet - Laserfiche WebLink

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Storm Sewer All of the streets under consideration have existing storm sewcr. However, some of the . structure castings have deteriorated or been damaged by snow plows and need replacement. The Public Works stafThas reviewed all catch basins and manholes in the proposed project areas to identify structures needing repairs or replacement. PROPOSED UTILITY IMPROVEMENTS The existing manholes, fire hydrants, gate valves, and other similar structures will be adjusted and repaired as nccessary as part of this project. The cost of any underground utility improvemcnts will be excluded from the assessable portion ofthe project and financed by the appropriate utility fund. Casting replacements or repairs are considered part of the street improvements and are not charged to individual utility funds. Staff will work with other public and quasi-public utilities to coordinate other utility improvements with the street reconstruction project. Watcrmain Reviewing the history of watem1ain breaks, staff feels that there arc no areas that need complete rcplacement of water main. As a gcneral guide, watem1ain replacement should be considered when more than live breaks occur in a ten year time pcriod. Staff identified one gate valve on Brighton Way that needs replacement; this work is . recommended as a part orthis project. Sanitary Sewer After revicwing the sanitary sewer video tapes, one segment of pipe was identified that needs repair. Approximately 30 feet of sanitary sewer pipe along Briarknoll Circle has cracked and is sagging, and needs replacement. Other minor cracks were noted, however, these are pipe segments that could be repaired using trench less technologies, such as pipe lining. City staff will be working on a separate pipe lining project in 2007, outside the scope ofthe PMP. Storm Sewer Some of the existing storm sewer structures are in need of repair. The catch basin casting on the north side of the Briarknoll Circle and Briarknoll Drive intersection will be replaced. The high flow inlet structure in the cui de sac on Lametti Lane also needs rcpair. At the ncighborhood meeting, a resident raised a question about making improvements to the existing storm sewer to improve the water quality in Karth l,ake. Staff is currently exploring options and reviewing requiremcnts for the Riec Creek Watershed District. One possibility would be to construct an in-line storm water treatment structure. Prices for these structures typically range anywhere from $25,000 to $50,000: the budgeted amount in the Stom1 Sewer Fund is $20,000. Staff will continue to gather more information in order to provide a recommendation to City Council at thc Public Hcaring. . 21