Water Resource Management Design and Construction Manual

Transcription

1 Water Resource Management Design and Construction Manual Prepared for City of Auburn, Alabama Revised December Carmichael Road Montgomery, Alabama 36106

2 Contents Section 1 General Information 1.1 Introduction Purpose of the Manual Use of the Manual Authority Fines and Penalties Abbreviations, Acronyms, and Definitions Purpose Word Usage Abbreviations and Acronyms Definitions Development Review Process Overview Site Plan Project Subdivision Development Review Team Permits Construction Approved Plans and Revisions Materials Submittals Installation Requirements Inspection and Testing Contacts As-Built Drawings Surveying Engineering Submittal Easements Discussion Dedication by Document Dedication by Plat Easement Language Agreements Hold Harmless and Indemnity Easement Encroachment Acceptance Authorities Preliminary Acceptance Final Acceptance Warranty Period Fees and Charges ii

3 Discussion Water and Sewer Fee Estimates Updates and Waivers to the Manual Updates Project-specific Waivers Section 2 Water Design and Construction 2.1 Introduction: Design Responsibility and Applicability of Requirements General Considerations Existing Water Facilities Proposed Water Facilities System Demand Analysis Submittal Requirements Overall Water Main Layout Water Main Profiles Fire-Flow Calculations Water Design and Layout Water Main Location General Design Considerations Water Main Sizes Water Main Connections Cover Requirements Utility Crossings Road Bores and Casings Thrust Restraint Devices Water Valves Air Release Valves Pressure Reducing Valves Fire Hydrants Fire Protection and Fire Lines Water Meters Backflow Protection Devices Concrete Vaults Aboveground Enclosures Right-of-Way Permits for Utility Crossings Water Easements Section 3 Sewer Design and Construction 3.1 Introduction: Design Responsibility and Applicability of Requirements General Considerations Existing Sewer Facilities Proposed Sewer Facilities System Capacity Analysis Submittal Requirements Gravity Sewer Design and Layout Sewer Main Location General Design Considerations iii

4 3.4.3 Sanitary Sewer Connections Sewer Size and Mains Minimum Slopes Cover Requirements Sewer Manholes Separation of Sewer and Water Lines Road Bores and Casings Sewer Laterals Grease Traps Oil and Grit Separators Open Surface Drains Pool Drains Sanitary Sewer Pump Station and Force Main Design Discussion Submittal Requirements General Design Considerations Mechanical Electrical Structural Piping Site Design Potable Water Requirements Construction Submittals Inspection and Acceptance Section 4 Stormwater Quality, Erosion, and Sediment Control 4.1 Introduction Erosion and Sediment Control Post-development Stormwater Quality Management Importance of Compliance Common Needs on Construction Sites City of Auburn Requirements and Special Conditions under the Municipal Separate Storm Sewer System Designation by ADEM City of Auburn Erosion and Sedimentation Control Permitting Erosion and Sedimentation Control Ordinance City of Auburn Erosion and Sedimentation Control Guidelines and Requirements City of Auburn Design and Construction Standards CBMPP Approval, Implementation, Inspection, and Maintenance Requirements Submittals Checklists City of Auburn Inspection and Enforcement Program Post-development Stormwater for Water Quality Management Introduction Stormwater Wetland iv

5 4.4.3 Bioretention Area (also known as Rain Garden or Biofiltration Device) Wet Detention Basin (also known as Stormwater Retention or Detention Ponds) Grassed Swale (also known as Enhanced Swale or Biofiltration Swale) Infiltration Devices (Trench, Basin, or Dry Well) Buffers (also known as Riparian Forested Buffers) Permeable Pavement (also known as Pervious Pavement) Sand Filter Filter Strip (also known as Grass Filter Strip and Buffer Strip) Manufactured BMP Systems (known as Oil-grit Separator; Oilwater Separator) Dry Extended Detention Basin Using Other or New Structural Stormwater Controls Structural Stormwater Control Pollutant Removal Capabilities Structural Stormwater Control Selection General Application Control Screening Process Limited Application Control Screening Process Example Application Online Versus Offline Structural Controls Using Structural Stormwater Controls in Series City of Auburn Site Development Review Tool City of Auburn Conservation Subdivision Regulations References Appendices Appendix A Standard Details Standard Water Details Typical Deadman Thrust Restraint Typical Concrete Thrust Block Design Typical Concrete Thrust Block Layout Typical End of Main for Future Extension Typical End of Main in Cul-de-sac Bedding Requirements for Trenches Typical Bore Encasement Typical Fire Hydrant Installation Typical Valve Box Installation Typical Reduced Pressure Backflow Assembly (RPBA) Typical Fire Protection System RPBA Typical Double Check Backflow Assembly (DCBA) Typical Fire Protection System DCBA v

6 Typical Fire/Domestic Meter Vault (4 and Larger) Typical Large Domestic Meter Vault (3 and Larger) Typical 1.5 to 2.0 Meter Vault with DCBA Typical 1.5 to 2.0 Meter Vault with RPBA Typical Multiple Meter Vault Typical Service Box and Lid Typical ¾ to 1 Meter Typical Automatic Air Release Valve Typical Manual Air Release Valve Typical 1 Service Connection Typical 2 Service Connection Typical Copper Repair (1 Only) Typical Double Service Connection General Service Connection Configurations Standard Sanitary Sewer Details Typical Drop Manhole Standard Manhole Typical Saddle Manhole Typical 4 or 6 Drop Service Line Bedding Requirements for Trenches Typical Watertight Manhole Cover Standard Manhole Ring and Cover Manhole Adjustment Riser Typical Grease Trap Typical Oil/Grit Separator Typical Stream Crossing Typical Aerial Stream Crossing Typical Bore Encasement Typical Service Connections Typical Service Line Typical Cleanout Typical Valve Box Installation (Force Main) Combination Air Release and Air/Vacuum Valve (Force Main) General Pump Station Site Plan General Pump Station Site Section Standard Erosion Control Details Erosion Control Notes Silt Fence with Wire Mesh (ALDOT Type A) Silt Fence with Polypropylene Mesh (GDOT Type C) vi

7 Straw Roll Construction Exit Pad (CEP) Slope Installation Channel Installation Typical Check Dam (CD) Typical Curb Inlet Gravel Filter Typical Excavated Drop Inlet Protection (EIP) Silt Saver Round Frame Typical Sediment Basin Conventional Riser Outlet Structure Control Structure at Detention Pond Skimmer Outlet Structure Appendix B Standard Forms City of Auburn Site Development Plans Submittal Checklist... B-1 City of Auburn Subdivision Construction Plans Submittal Checklist... B-6 Development Application for Water and Sewer Service... B-11 Backflow Protection Information Form... B-14 Backflow Testing and Certification Form... B-15 AWWB Water Main Connection Permit Application... B-16 City of Auburn Sanitary Sewer Connection Permit Application... B-16 Pump Station Calculation Worksheet... B-18 Sample Standard Pump Station Completion Bond... B-20 Sample Standard Pump Station Warranty Bond... B-23 Grease Trap Size Calculation Data Sheet... B-25 Commercial Waste Manifest Form... B-26 Sample Standard Indemnity and Hold Harmless Agreement... B-27 Sample Standard Easement Encroachment Agreement... B-30 Request for Design and Construction Standard Waiver... B-32 Erosion and Sediment Control Inspection Checklist... B-33 City of Auburn Post-Development Water Quality Plan Submittal Form... B-35 Appendix C Exhibits Site Plan Development Utility Installation Flow Chart...C-1 Residential Subdivision Utility Installation Flow Chart...C-2 Tables 2-1 Minimum Cover External Thrust Restraint for Bends and Dead Ends (Linear Feet of Restraint Required on each Side of the Fitting along the Main Line) vii

8 2-3 External Thrust Restraint for Cut-In Tees on Existing Mains (Linear Feet of Restraint Required along the Branch Line Only) External Thrust Restraint for Tees on Proposed Mains (Linear Feet of Restraint Required along the Branch Line in Addition to 20-feet of Restraint on Both Sides of the Tee along the Main Line) External Thrust Restraint for Reducers (Linear Feet of Restraint Required on the Large Side of the Reducer) Maximum Valve Spacing Meter Selection Maximum Number of ¾-inch and 1-inch Meters Allowed by Service Line Size Minimum Sewer Slopes Recommended Design Criteria for Stormwater Wetlands Filter Strip Sizing Example Maintenance Schedule for Bioretention Areas Stream Buffer Width based on Drainage Area Stream Buffer Width based on Drainage Area Required Maintenance Activities for Permeable Pavement Installations Stormwater BMP Performance Characteristics BMP Selection Matrix Location and Permitting Checklist Limited Application BMPs Sample Structural Control Selection Matrix Figures 1-1 Development Review Process Double Check Backflow Assembly (DCBA) Reduced Pressure Backflow Assembly (RPBA) Fullport Backwater Valve Constructed Wetland, National Museum of the American Indian in Washington, D.C Schematic of Shallow Wetland Bioretention in Parking Lot Island Bioretention Applications Bioretention Example Site Plan Bioretention Facility Layout Bioretention Facility Typical Section Permanent Pool of Water in Wet Detention Basin Recently Constructed Grassed Swale in Residential Area, Pembroke Woods Subdivision in Emmittsburg, MD Typical Infiltration Trench Typical Infiltration Basin with Sand Filter Infiltration Trench Example Site Plan Infiltration Trench Site Plan First Flow Diversion Structure (Point A) Second Flow Diversion Structure (Point B) viii

9 4-16 Forested Buffer with Well-developed Streambank Vegetation Parking Lot with Interlocking Concrete Grid Installation Typical Permeable Paver Design Typical (Open) Sand Filter Surface or Open Sand Filter Volumes Perimeter or Closed Sand Filter Volumes Typical Sand Filter Media Cross Sections Detail for a Surface Sand Filter Perforated Standpipe Sand Filter Example Site Plan Head Diagram Flow Diversion Structure Sand Filter Site Plan View and Profile Filter Strip in Residential Area Dry Extended Detention Basin with Shallow Marsh Example of Online versus Offline Structural Controls Pipe Interceptor Diversion Structure Surface Channel Diversion Structure Outlet Flow Regulator Generalized Stormwater Treatment Train Examples of Structural Controls Used in Series Example Treatment Train Residential Subdivision Example Treatment Train Commercial Development Example Treatment Train Commercial Development Curve Number Adjustment Factor ix