Agenda - Public Works Committee - 06/17/2008

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CASE #J./ . CONSIDER 2008 STORM SEWER IMPROVEMENTS By: Steve Jankowski, City Engineer Background: Throughout the year staff becomes aware of various storm water issues that are brought to its attention through citizen complaints. The storm water utility provides a funding source to address correction of drainage issues which are not a result of new development. The purpose of this case is to familiarize the Committee with the drainage issues which have been brought to our attention. Staff is currently evaluating solutions and associated costs for storm water improvements that may either be bid or undertaken by the Public Works Department in 2008. Below is a brief description of the drainage issues being evaluated by staff for possible correction in 2008. Location maps are attached for each of these potential projects. . 16350 Kangaroo Street - A majority of the right~of-way drains to one location within the cul-de-sac and flows through an easement along the property line to a larger drainage and utility easement encumbering a wetland system behind the residences. This concentrated flow is creating an erosion problem along the property line and within the naturally occurring ditch system in the wooded area behi~d. Stabilization is required along the eroded areas, and the installation of storm sewer.and rip rap may be required to prevent reoccurrence in the future. . 694115?d Avenue ~ Drainage from Jaspar Street is transmitted from the street via a bituminous spillway andis supposed to flow through an easement along the property line to a wetland. The grade is relatively steep and the flow is not staying within the easement and is causing erosion. A line of mature pine trees along the northerly property line of 6941 152nd Avenue prevents the likelihood of turf ever becoming established. The owner reports water flowing into an outbuilding. It is likely that a storm pipe will be necessary to transmit this water downthe grade into the wetland. In this case some water quality treatment would also be required. . Llama Street and 163rd Avenue - A short segment of storm sewer is in place west of this intersection. However flow to this system originates over 1500 feet to the south near the intersection of Llama and 161 st Ave, a distance of over twice that recommended for curb line flow. A large portion of Llama Street is inundated during storms and to make matters worse, the flow washes large quantities of pine needles onto the first catch basin. This plugs the basin and water then overflows the crown of the road and flows down the 7