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Table of Contents <br />EXHIBITS <br />Exhibit 1 — Basin and Study Map <br />APPENDICES <br />Appendix A — Drainage Parameters <br />Appendix B — Existing Flow Rates <br />Appendix C — Swale Calculations <br />Appendix D — Equivalent New Redevelopment Areas for Biofiltration Swales Calculations Sheet <br />Appendix E — CIP 1 Cost Estimate <br />Appendix F — Operations and Maintenance Tables <br />Introduction........................................................ <br />1.1. Project Purpose......................................................... .......1 <br />1.2. Report Purpose...................................................................................................................1 <br />1.3. Design Codes and References--•........................................................................................1 <br />1.3.1. Department of Ecology.........................................................................................1 <br />1.3.2. City of Roslyn.......................................................................................................1 <br />2. <br />Basin Description............................................................................... <br />2.1. General............................................................................................................................... 2 <br />2.2. Historic and Existing Conditions.........................................................................................2 <br />2.3. Proposed Conditions...........................................................................................................2 <br />3. <br />Project Site Description ................................ <br />3.1. Project Limits....................................................................................................................... 3 <br />3.2. Project Site Conditions,..,..,.................................................................................................3 <br />3.3. Stormwater Features......................................................................................•....................4 <br />4. <br />Core tiemenr Anaiysis —................... .......... , .............I.." .............. ...........4 <br />5. <br />Alternatives Considered... ................... ...... .............. ....... -- .......... — —.—...............................4 <br />6, <br />Design Analysis. . ....... ................. .................... — ...... . - - ....... ............. .............. .................. 6 <br />6.1. Existing Stormwater Drainage System............................................................................... 6 <br />6.2. Proposed BMP Design and Improvements.........................................................................6 <br />7 <br />Water Quality Benefit...,... ........ ...... .................. <br />7.1. Runoff Treatment Comparison ............................................................................................ 8 <br />7.2. Equivalent New/Redevelopment Areas.............................................................................. 9 <br />8. <br />Capital Improvement Plan .............................................. ......... ................... ..,— ... ............. ....... 9 <br />EXHIBITS <br />Exhibit 1 — Basin and Study Map <br />APPENDICES <br />Appendix A — Drainage Parameters <br />Appendix B — Existing Flow Rates <br />Appendix C — Swale Calculations <br />Appendix D — Equivalent New Redevelopment Areas for Biofiltration Swales Calculations Sheet <br />Appendix E — CIP 1 Cost Estimate <br />Appendix F — Operations and Maintenance Tables <br />