2010-11-23_PWETC_AgendaPacket - Laserfiche WebLink

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Try T V JL I MJ 1 _JJ Project Update The City has been working on implementing a two phased project to improve water quality and alleviate some of the flooding concerns in your neighborhood. The project was designed reduce volume and to stagger the timing for storm water as it flows through the storm sewer system. Holding back water will modify the time that storm water reaches the system, making the system better able to accommodate the storm water and reduces the depth of the street flooding. Phase 1 Over the last year, 19 rain gardens and infiltration basins were constructed throughout the neighborhood as Phase 1 of the drainage improvement project. Storm runoff is diverted into the rain gardens, where the water infiltrates into the ground, removing pollutants from the runoff, as well as decreasing the amount of storm water that enters the storm sewer system. Phase 2 Improvements in Phase 2 include the construction of an underground storm water chamber in the open area on the west side of Midland Hills Road, between Rosewood Lane North and Rosewood Lane South. A biofiltration basin will also be constructed above the underground chamber. Storm water that currently reaches the existing storm sewer system will be diverted to the biofiltration basin and underground chamber. Storm water will be retained until the storm sewer pipe drains to a level where it can accept more water. The underground chamber will then drain into the storm sewer (similar to draining a bath tub.) Also included in Phase 2 are improvements to the wetland on the north side of Rosewood Lane North. Sediment that has built up over the Check for construction updates at: Walsh Lake ubw tershed years will be excavated, and the wetland will be expanded and deepened to provide additional storage for storm water. Once all grading is complete, the wetland will be restored with native plantings, as well as trees and shrubs that like to grow near water, such as river birches and dogwoods. Project Schedule Construction of the underground storm water chamber is anticipated to begin the week of November 15, 2010. We are finalizing coordination details for the wetland expansion work. An updated schedule will be provided when it becomes available. Questions? Please contact us: Kristine Giga, P.E., Civil Engineer (651) 792 -7048 kristine .giqaCcD-ci.roseville.mn.us Dean Findell, Project Coordinator (651) 792 -7046 Dean .findellC@-ci.roseville.mn.us www. cityofrosevil le. com /projects. Construction of underground storm chamber