07-12-2004 Council Packet - Laserfiche WebLink

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New Pipe in Baldur Park Road Right of Wav A refinement of this option is to replace the current 8” pipe along Baldur Park Road with a new pipe with a capacity equivalent to the existing 8" pipe plus the proposed 12” pipe. The advantage is that this can be done without excavating the roadway, which is less expensive, both in terms of the initial repair of the road, and in terms of on-going repairs caused by the pipe under the road moving up and down with the freeze and thaw cycle. The disadvantage of this option is that it would require the removal of several shrubs that have been planted by the adjacent property owner in the City right-of-way above the existing 8" pipe. The City discourages the planting of landscaping on the City right-of-way, particularly on top of utility lines. The roots of the plantings can damage the utility lines. Also, if excavation of the line is ever required for repairs, the plantings would have to be removed. The plantings along Baldur Park Road could be replaced off of the right-of-way, or, could be replaced with plantings that would be less prone to damage the pipe. However, careful consideration should be given to the legitimacy of City funds being used to replacing landscaping that has been planted on street right of way. New Pine to Maxwell Bay Another option is to install a 12” pipe from the new catch drain on the north side of Birch lane. This pipe would run from the intersection north along Baldur Park Road and then in a westerly direction through the rear portion of the back yards of several houses on North Shore Drive. This pipe would outlet into a wetland area adjacent to Maxwell Bay. The positive aspect of this option is that the wetland area would provide for treatment of the storm water before it flows into the lake. The negative aspects of this option include the need to obtain easements for the construction and maintenance of this pipe and also the need for possible watershed district approval of this pipe. Letters have been sent to the property owners regarding the possibility of obtaining easements for this pipe, and these property owners were not interested in providing easements. Copies of letters that were received from two of the three property owners are attached for you information. Staff Recommendation As indicated above, each of the options equally addresses the need to increase storm water flow capacity. The option that best addresses water quality as well as water quantity is the option that outlets the water into the wetland area adjacent to Maxwell Bay. However, this option may not be do-able, particularly within the necessary timeframe, because of the easement issues. Therefore, staff is recommending the selection of one of the options that carry all of the storm water flows to the south along Baldur Park Road, with the preferred option being replacement of the existing pipe with a larger capacity pipe Page 3 of 4 j