Ordinance 2213-97 - Laserfiche WebLink

Edgewater Creek Basin Mitigation 1. The April 1992 Port Gardner Bay Drainage Plan Update Report No. 5 calls for upgrading two undersized storm drains on Mukilteo Boulevard and modifying other drainage structures to provide peak flow mitigation. The City should pursue these facilities. Powder Mill Gulch Basin Mitigation 1. Pursue reintroduction of resident cutthroat trout in Powder Mill Gulch Creek. If the water quality of this stream remains stable, and if an adequate population of aquatic insects develops, the reach between Seaway Boulevard and Mukilteo Boulevard would be appropriate for the introduction of resident cutthroat trout. However, restoration or creation of salmonid habitat downstream of Mukilteo Boulevard would be difficult and is not recommended. The culvert under Mukilteo Boulevard acts as a physical barrier to migration; the stream below this culvert is quite steep. The culverts passing under the Burlington Northern Railroad tracks also bar upstream salmonid migration. 2. The City should work with residents to redesign problematic residential stormwater outfalls in order to improve channel conditions, reduce erosion, and reduce sediment loads. Narbeck Creek Basin Mitigation 1. Support Narbeck Swamp wetland restoration and creation. Paine Field and the Fluke Corporation are planning to make improvements to Narbeck Swamp as mitigation for other development projects. 2. Revegetate cleared hillsides and creek habitat in the lower third of the drainage (residential areas) in order to stop landslides. 3. The City should work with property owners to inventory problem stormwater outfalls, and implement a retrofit program. Narbeck is experiencing significant local erosion problems as a result of poorly designed stormwater outfalls from residential development. Identification and correction of these problem outfalls is an inexpensive means of significantly improving habitat in these streams. Some outfalls can be routed to dispersal pipes laid on contour with rip-rap to disperse energy. Others can be improved simply by taking the pipe all the way to the channel rather than discharging at the top of the steep erodible gorge. Merrill and Ring Creek Basin Mitigation 1. Enlarge regional detention facilities to provide additional control of high flows and improve the habitat potential of this stream. 2. The City should construct a regional detention facility south of Westridge Mobile Home Park as proposed in the April 1992 Port Gardner Bay Drainage Plan Update Report No. 5. Phillips Creek Basin Mitigation No basin specific mitigation recommendations. 32