CITY OF DURHAM & ORANGE COUNTY ENO ECONOMIC DEVELOPMENT DISTRICT WATER AND SEWER SYSTEM PROJECT DRAFT MASTER PLAN REPORT November 2013 Table of Contents Section 1 Introduction 1.1 Project Background and Objectives ............................................................................................................... 1‐1 1.2 Project Area ............................................................................................................................................................. 1‐1 1.3 Scope of Study ......................................................................................................................................................... 1‐2 1.4 Report Format ........................................................................................................................................................ 1‐3 Section 2 Water Demand and Wastewater Flow Projections 2.1 Land Use Assumption .......................................................................................................................................... 2‐1 2.2 Water Demand Projections ............................................................................................................................... 2‐3 2.3 Wastewater Flow Projections .......................................................................................................................... 2‐5 2.4 Phasing and Summary ......................................................................................................................................... 2‐5 Section 3 Evaluation of Existing Water Infrastructure within Eno EDD 3.1 Existing Infrastructure ........................................................................................................................................ 3‐1 3.2 Water Distribution System Evaluation ........................................................................................................ 3‐1 3.2.1 Model Verification .................................................................................................................................... 3‐1 3.2.2 Model Set‐Up and Evaluation Criteria ............................................................................................. 3‐1 3.2.3 Hydraulic Capacity Analysis ................................................................................................................. 3‐3 3.2.4 Summary ...................................................................................................................................................... 3‐4 Section 4 Proposed Wastewater Collection System within the Eno EDD 4.1 Existing Wastewater Collection System ...................................................................................................... 4‐1 4.2 Eno EDD Physical Features ............................................................................................................................... 4‐1 4.2.1 Roadways ..................................................................................................................................................... 4‐1 4.2.2 Hydrography ............................................................................................................................................... 4‐2 4.2.3 Topography ................................................................................................................................................. 4‐4 4.3 Design Criteria ........................................................................................................................................................ 4‐4 4.3.1 Priority Service Areas ............................................................................................................................. 4‐4 4.4 Proposed Wastewater System ......................................................................................................................... 4‐5 4.4.1 Peaking Factor ............................................................................................................................................ 4‐5 4.4.2 Gravity Sewer ............................................................................................................................................. 4‐5 4.4.2.1 Pipe Depth Analysis ................................................................................................................... 4‐5 4.4.2.2 Pipe Capacity ............................................................................................................................. 4‐10 4.4.3 Eno EDD Pump Station ........................................................................................................................ 4‐12 4.4.3.1 Pump Station Location .......................................................................................................... 4‐12 4.4.3.2 Pump Station Capacity .......................................................................................................... 4‐13 4.4.4 Force Main ................................................................................................................................................ 4‐13 i Table of Contents Eno Economic Development District Water and Sewer System Project – Draft Master Plan Report Section 5 Conveyance to City of Durham’s Wastewater Collection System 5.1 Eno EDD Force Main Discharge Alternatives ............................................................................................. 5‐1 5.1.1 Alternative Discharge Locations ......................................................................................................... 5‐1 5.1.2 Interbasin Transfer Considerations .................................................................................................. 5‐3 5.2 Hydraulic Model Set‐Up ...................................................................................................................................... 5‐3 5.2.1 Estimated Peak Hour Design Flows from Eno EDD .................................................................... 5‐3 5.2.2 Eno and Ellerbe Creek Outfall Model Set‐Up ................................................................................. 5‐4 5.2.3 Mud Creek Outfall Model Set‐Up ........................................................................................................ 5‐4 5.3 Capacity Analysis ................................................................................................................................................... 5‐6 5.3.1 Eno Outfall .................................................................................................................................................... 5‐6 5.3.2 Ellerbe Creek Outfall ................................................................................................................................ 5‐6 5.3.3 Mud Creek Outfall ..................................................................................................................................... 5‐6 5.4 Additional Hydraulic Considerations ............................................................................................................ 5‐7 Section 6 Engineers Opinion of Probable Construction Cost 6.1 Construction Cost Assumptions ...................................................................................................................... 6‐1 6.2 Projections Unit Costs to Future Values ...................................................................................................... 6‐2 6.3 Opinion of Probable Construction Cost ........................................................................................................ 6‐2 Section 7 Permit Requirements 7.1 Construction Cost Assumptions ...................................................................................................................... 7‐1 7.2 Authorization to Construct ................................................................................................................................ 7‐1 7.3 Nationwide Permit/ Water Quality Certification ..................................................................................... 7‐1 7.4 Sediment and Erosion Control Plan ............................................................................................................... 7‐2 7.5 Falls Lake Nutrient Management Strategy ................................................................................................. 7‐2 7.6 Building Standards Permit ................................................................................................................................. 7‐2 7.7 Air Quality Registration ...................................................................................................................................... 7‐3 7.8 NC DOT ....................................................................................................................................................................... 7‐3 7.9 Railroad ...................................................................................................................................................................... 7‐3 7.10 Miscellaneous Coordination .............................................................................................................................. 7‐3 Section 8 Conclusions and Recommendations 8.1 Conclusions .............................................................................................................................................................. 8‐1 8.2 Cost