9908 18TH AVE W 2024-12-03 - Laserfiche WebLink

down-gradient of the wetland. These functions are limited by the lack of flood storage depth during wet periods. Additionally, the wetland has not been identified as important for flood storage in a regional flood control plan. As such, the purchase of mitigation bank credits from the KFMB will result in no net loss in hydrologic functions within the Cedar-Sammamish watershed. Wetland B scores 6 out of 9 for hydrology. • Habitat: Wetland A Wetland A provides some habitat functions due to the presence of multiple Cowardin classes, moderate species richness and special habitat features. However, habitat accessibility is very limited and the presence of undisturbed habitat within 1 kilometer of the wetland is less than 10 percent. Additionally, more than 50 percent of the surrounding land use is categorized as high intensity. As such, the purchase of mitigation bank credits from the KFMB will result in a net increase in habitat functions within the Cedar-Sammamish watershed when compared to the limited habitat functions currently provided by Wetland A. Wetland A scores 4 out of 9 for habitat. Wetland B Wetland B provides minimal habitat functions due to the lack of multiple Cowardin classes and hydroperiods,no habitat interspersion,and low amount of special habitat features. Additionally, habitat accessibility is very limited and the presence of undisturbed habitat within 1 kilometer of the wetland is less than 10 percent. Additionally, more than 50 percent of the surrounding land use is categorized as high intensity. As such, the purchase of mitigation bank credits from the KFMB will result in a net increase in habitat functions within the Cedar-Sammamish watershed when compared to the habitat functions currently provided by Wetland B. Wetland B scores 4 out of 9 for habitat. 2.3 Mitigation Strategy The proposed compensatory mitigation actions are intended to compensate for lost wetland functions and values by providing additional wetland functions according to the needs of the site and watershed and providing an overall improvement in the quality of wetland habitat and no net loss in habitat and ecological function. To achieve this, the objectives of the mitigation actions are to purchase credits from the KFMB to compensate for unavoidable direct impacts to Wetland A and Wetland B. Please refer to Appendix B for a Mitigation Bank Service Area Exhibit. The Mitigation Plan will incorporate use of the mitigation bank to meet federal, state, and local requirements that are most appropriate for the impacted critical areas. 2.3.1 Mitigation Bank Use The proposed wetlands to be filled provide limited functions to the larger watershed due to their small, isolated nature,the presence of non-native,invasive species,and the past anthropogenic disturbances including mowing. Full wetland compensation will be provided through a consolidated mitigation program that has greater potential to provide valuable wetland functions as well as the landscape potential to maintain those functions. 1345.0029—Benton Square 9 Soundview Consultants LLC Conceptual Mitigation Bank Use Plan April 1,2022