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Table of Contents <br />I <br />Introductto, <br />1.1. Project Purpose...................................................................................................................1 <br />1.2. Report Purpose................................................................................................................... <br />t <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 />2.1. General...............................................................................................................................2 <br />2.2. Historic and Existing Conditions.........................................................................................2 <br />2.3. Proposed Conditions...........................................................................................................2 <br />3 <br />Project Site Description _. <br />3 <br />3.1. Project Limits....................................................................................................................... <br />3 <br />3.2. Project Site Conditions........................................................................................................3 <br />3.3. Stormwater Features...........................................................................................................4 <br />4. <br />Core Elemei _ <br />4 <br />5. <br />Alternatives Considered.......__...... _.... ..._.._ <br />.. 4 <br />6 <br />Design in clysis <br />6.1. Existing Stormwater Drainage System ..... .... ........ ..—................. ...... <br />............. ....... .............. 6 <br />6.2. Proposed BMP Design and Improvements.........................................................................6 <br />7 <br />Water Quality Be- <br />7.1. Runoff Treatment Comparison............................................................................................ <br />8 <br />7.2. Equivalent New/Redevelopment Areas.............................................................................. <br />9 <br />8 <br />Capital Improvement Plan ._.__ <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 />