7007 SEAWAY BLVD 2025-07-14 - Laserfiche WebLink

2021 NWPs- Final 16 NWPs for the Seattle District in Washington State, as applicable. RGC 1, Project Drawings Drawings must be submitted with pre-construction notification (PCN). Drawings must provide a clear understanding of the proposed project, and how waters of the United States will be affected. Drawings must be originals and not reduced copies of large-scale plans. Engineering drawings are not required. Existing and proposed site conditions (manmade and landscape features) must be drawn to scale. RGC 2, Aquatic Resources Requiring Special Protection A PCN is required for activities resulting in a loss of waters of the United States in wetlands in dunal systems along the Washington coast, mature forested wetlands, bogs and peatlands, aspen-dominated wetlands, alkali wetlands, vernal pools, camas prairie wetlands, estuarine wetlands, and wetlands in coastal lagoons. RGC 3, New Bank Stabilization in Tidal Waters of Puget Sound Activities involving new bank stabilization in tidal waters in Water Resource Inventory Areas (WRIAs) 8, 9, 10, 11 and 12 (within the areas identified on Figures 1a through le)cannot be authorized by NWP. RGC 4, Commencement Bay No permanent losses of wetlands or mudflats within the Commencement Bay Study Area may be authorized by any NWP (see Figure 2). RGC 5, Bank Stabilization All projects including new or maintenance bank stabilization activities in waters of the United States where salmonid species are present or could be present, requires PCN to the U.S. Army Corps of Engineers (Corps) (see NWP general condition 32). For new bank stabilization projects only, the following must be submitted to the Corps: a. The cause of the erosion and the distance of any existing structures from the area(s) being stabilized. b. The type and length of existing bank stabilization within 300 feet of the proposed project. c. A description of current conditions and expected post-project conditions in the waterbody. d. A statement describing how the project incorporates elements avoiding and minimizing adverse environmental effects to the aquatic environment and nearshore riparian area, including vegetation impacts in the waterbody. In addition to a. through d., the results from any relevant geotechnical investigations can be submitted with the PCN if it describes current or expected conditions in the waterbody. RGC 6, Crossings of Waters of the United States Any project including installing, replacing, or modifying crossings of waters of the United States, such as culverts or bridges, requires submittal of a PCN to the U.S. Army Corps of Engineers (see NWP general condition 32). If a culvert is proposed to cross waters of the U.S. where salmonid species are present or could be present, the project must apply the stream simulation design method from the Washington Department of Fish and Wildlife located in the Water Crossing Design Guidelines (2013), or a design method which provides passage at all life stages at all flows where the salmonid species would naturally seek passage. If the stream simulation design method is not applied for a culvert where salmonid species are present or could be present, the project proponent must provide a rationale in the PCN sufficient to establish one of the following: a. The existence of extraordinary site conditions. b. How the proposed design will provide equivalent or better fish passage and fisheries habitat benefits than the stream simulation design method. Culverts installed under emergency authorization that do not meet the above design criteria will be required to meet the above design criteria to receive an after-the-fact nationwide permit verification. RGC 7, Stream Loss A PCN is required for all activities that result in the loss of any linear feet of streams. 13