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SAGE HOMES NORTHWEST, LLC <br />HARBORS EDGE DRAINAGE REPORT <br />AUGUST 2022 <br />X4101i "101V <br />SECTION# TITLE PAGE # <br />1. Project Overview.............................................................................................................................. <br />5 <br />2. Minimum Requirements.................................................................................................................. <br />7 <br />2.1 Minimum Requirement #1: Preparation of Stormwater Site Plans .................................... <br />7 <br />2.2 Minimum Requirement#2: Construction Stormwater Pollution Prevention .....................7 <br />2.3 Minimum Requirement#3: Source Control of Pollution....................................................7 <br />2.4 Minimum Requirement #4: Preservation of Natural Drainage Systems and Outfalls......... <br />7 <br />2.5 Minimum Requirement #5: Onsite Stormwater Management .......................................... <br />7 <br />2.6 Minimum Requirement #6: Runoff Treatment................................................................... <br />7 <br />2.7 Minimum Requirement #7: Flow Control........................................................................... <br />7 <br />2.8 Minimum Requirement #8: Wetlands Protection.............................................................. <br />8 <br />2.9 Minimum Requirement #9: Operations and Maintenance Manual...................................8 <br />3. Offsite Analysis................................................................................................................................. <br />9 <br />3.1 Resource Review Summary.................................................................................................9 <br />3.2 Upstream Basin Analysis.....................................................................................................9 <br />3.3 Downstream Flowpath Analysis.......................................................................................... <br />9 <br />4. Flow Control and Water Quality Analysis and Design..................................................................... <br />15 <br />4.1 Hydrologic Analysis............................................................................................................15 <br />4.1.1 Existing Conditions...............................................................................................15 <br />4.1.2 Developed Conditions..........................................................................................15 <br />4.1.3 Hydrologic Modeling............................................................................................15 <br />4.2 Water Quality Calculations................................................................................................15 <br />4.3 Low Impact Development and Onsite Stormwater Management.....................................16 <br />4.4 Flow Control......................................................................................................................17 <br />4.5 Conveyance.......................................................................................................................18 <br />5. Source Control of Pollution............................................................................................................ <br />19 <br />6. Preservation of Natural Drainage Systems and Outfalls................................................................. <br />19 <br />7. Other Permits................................................................................................................................. <br />20 <br />8. Construction Stormwater Pollution Prevention Plan...................................................................... <br />20 <br />8.1 Element 1— Preserve Vegetation/Mark Clearing Limits....................................................20 <br />8.2 Element 2 — Establish Construction Access.......................................................................20 <br />8.3 Element 3 — Control Flow Rates........................................................................................ <br />20 <br />PACE PAGE III <br />