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••-•STING ocr 14 J002 C'"f^^rUHUvO DA’^E: October 14,2002 ITEM NO.; j ^ Agenda Section: Public Services Director ’s Report There is an existing metal pipe developed land in the Navarre storm water flow from this pipe the railroad tracks then flows lere is significant erosion at the es and garages located on them id them. This results in damage arages during heavy rains. ecame worse after 1995 when I ditch cleaning activities were •rm sewer pipe from the railroad lecause of funding issues. The large drainage area upstream of iiscussed. Drainage assessment iperty owners have no incentive legative impacts from the storm times over the last few years le problem because of funding n inplace to provide money for nth stormwater utility funds is ‘ public street runoff that flows d by the large amount of storm ssessment project to solve this s in the drainage area are not ) support an assessment project. Stormwater Project Options There is range of options available to solve this problem ranging from; doing nothing, the low-cost installation.pr a pipe and swale to direct the water past the buildings then utilizing an existing swale and existing pipe to direct the water into Crystal Bay, to options requiring expensive property acquisition and stormwater pond construction. The option to do nothing will result in continued erosion, flooding of yards, possible property damage to the structures located on this projects, and would not provide any stormwater treatment to improve the quality of the stormwater effluent discharge into Crystal Bay. Our staff recommendation is that doing nothing is not the most desirable option as this would result in continued property owner dissatisfaction and provide no water quality improvements. A plan has been prepared for the low-cost option of installing a pipe across the back yard of the 3447 Crystal Bay Road property and a drainage swale on the west edge of the property located at 3435 Crystal Bay Road. This new swale would connect to an existing swale at a point 120 feet from the edge of the lake. The existing swale then drains to an inplace culvert under Crystal Bay Road. We have requested quotations for this work from several area landscaping companies and will have quotations for the Council meeting. This option would reduce the erosion and flooding problems on these properties, and the property owners are in support of this project. However, this option does not provide any water quality improvements. Additional options for water quality improvement projects are described later in this report. The completion of a project to improve water quality could be a longer term project, and this project could be constructed as an interim solution to reduce the erosion and flooding problems on these properties. The construction of stormwater ponding for water quality improvements is another possibility. This would require the acquisition of property. An issue for consideration is that the four properties located at 3407,3415,3435, and 3445 Crystal Bay Road do not extend to the lakeshore as the City of Orono owns the lakeshore parcels in front of these houses, and this may affect the value of these properties. There is also a platted 66' wide road right of way along the lakeshore side of these properties. Below is a tabulation of the property sizes, valuation for 2002 tax purposes, 'ast sale price with year, and occupation status. Address• Status Size Stand SHouse STotal Year/SLast Sal 3407 Occupied 0.25 ac 239,000 28,000 267,000 NA 3415 Occupied 0.26 ac 239,000 97,000 336,000 1999/5390,000 3435 Occupied 0.18 ac 217,500 25,500 243,000 1996/5140,000 3445 Vacant 0.15 ac 205,000 10,500 215,500 2001/5270,000 3447 Occupied 0.15 ac 29,500 28,500 58,000 NA Page 2 of 4