EXH1019035118

PCHBPollution Control Hearings Board of the State of Washington

This document is the Port's response to questions raised by agencies andthe public during the comment periods for the Public Notice. The document is organized into two main sections. The first addresses six general questions/concerns that were raised by several commenters. The following summarizes those concerns and the Port's responses. 1. Has the Port followed the required process regarding wetland impacts and mitigation? The sequencing outlined in the EPA/COE MOA has been followed. Impacts have been avoided and minimized wherepossible.Compensatorymitigationis proposedfor impactsthatcannotbeavoided. 2. Is there justification to replace some wetland functions in another watershed? The majority of wetland functions arebeing replaced in the impacted watersheds. The Port has proposed new in-basin mitigation in its Medified Mitigation Approach datedMay 1998. The off-site mitigation wetland in Auburn is proposed to compensate for impacts to wildlife habitat. FAA guidance and the Port's need to maintaina safe environment for aircraftoperations precludes it from being able to create and maintain wetland habitat near the Airport. 3. Is there a need for the proposed development in the area known m the South Aviation Support Area(SASA)? SASA is needed at Sea-Tac Airport to provide space for displaced line maintenance facilities and to accommodate an existing and growing need for cargo facilities. In response to agency concerns, the SASA preliminary design has been reevaluatedand it appears that impacts to 1.04 acres of wetlands can be avoided through the use of bridges and retaining walls. 4. Can the wetlands in the on-site borrow source areas be avoided? Impacts to…
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