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DRAINAGE REPORT <br />Miller Residence Drain <br />TABLE OF CONTENTS <br />June 2023 <br />1.0 Project Overview <br />1 <br />General Description of Project...............................................................................................................................2 <br />Site Area and Size of Improvements......................................................................................................................3 <br />Developed Site and Runoff Conditions...................................................................................................................4 <br />2.0 Existing Conditions Summary <br />4 <br />SiteTopography......................................................................................................................................................4 <br />ExistingDrainage Patterns......................................................................................................................................4 <br />SiteSoils and Ground Cover...................................................................................................................................5 <br />CriticalAreas...........................................................................................................................................................5 <br />Adjacent Areas and Existing Development.............................................................................................................5 <br />3.0 Applicable Minimum Requirements <br />6 <br />Minimum Requirement #1: Preparation of Stormwater Site Plans.......................................................................7 <br />Minimum Requirement #2: Stormwater Pollution Prevention Plan (SWPPP).......................................................7 <br />4.0 Off -site Analysis <br />7 <br />5.0 Stormwater Pollution Prevention Plan (SWPPP) <br />7 <br />ElementNo. 1—Mark Clearing Limits.....................................................................................................................7 <br />Element No. 2 — Establish Construction Access......................................................................................................7 <br />Element No. 3 — Control Flow Rates.......................................................................................................................8 <br />Element No. 4 — Install Sediment Controls.............................................................................................................8 <br />ElementNo. 5 — Stabilize Soils................................................................................................................................8 <br />ElementNo. 6 — Protect Slopes..............................................................................................................................8 <br />ElementNo. 7—Protect Drain Inlets......................................................................................................................8 <br />Element No. 8—Stabilize Channels and Outlets....................................................................................................9 <br />Element No. 9 — Control Pollutants........................................................................................................................9 <br />Element No. 10 — Control De-Watering..................................................................................................................9 <br />ElementNo. 11— Maintain BMPs...........................................................................................................................9 <br />Element No. 12 — Manage the Project...................................................................................................................9 <br />Element No. 13 — Protect On -Site Stormwater BMPs for Runoff from Roofs and Other Hard Surfaces..............10 <br />6.0 Special Reports and Studies <br />12 <br />7.0 Other Permits <br />12 <br />8.0 Operation and Maintenance Manual <br />12 <br />APPENDICES <br />APPENDIX A Civil Plan Set <br />APPENDIX B Survey <br />APPENDIX C Structural Plan Set <br />APPENDIX D Geotechnical Report <br />APPENDIX E NRCS Soil Survey Report <br />APPENDIX F WWHM Summary <br />APPENDIX G Operation & Maintenance Manual <br />LIST OF FIGURES <br />Figure 1 Vicinity Map (Not to scale)........................................................................................................................1 <br />Figure2 Looking North from Slope........................................................................................................................2 <br />Figure3 Looking West............................................................................................................................................2 <br />Figure4 Looking East..............................................................................................................................................3 <br />Figure 5 Stormwater Management Manual for Western Washington — Volume I — Figure 2.4.2..........................6 <br />XG/Watershed <br />20230616 Miller Drainage Report FINAL Page iv <br />