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Musquodoboit Harbour Follow up Study Report Final Report

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Musquodoboit Harbour Follow up Study Report Final Report Musquodoboit Harbour Follow Up Study Report Final Report 061034.01 Final Report May 2010 ISO 9001 Registered Company Prepared for: Prepared by: 23 May 2013 Marcus Garnet Senior Planner Regional and Community Planning Halifax Regional Municipality P.O. Box 1749 Halifax, NS B3J 3A5 Dear Mr. Garnet: RE: FinalReportforHRMRFPNumber09 048 Musquodoboit Harbour Watershed / Servicing Study Follow up Analysis Please find enclosed one (1) bound copy and one (1) copy on CD of our Final Report for this 1489 Hollis Street study. As agreed we have: PO Box 606 Made editorial changes to the Draft Report; and Halifax, Nova Scotia We have not updated the costs to 2013 dollars in this Final Report, they are still in 2009 Canada B3J 2R7 dollars. We have also included a separate copy of Table 5.5.1 from the report. Costs in this version Telephone: 902 421 7241 were prorated from May 2009 to 2013 using the multipliers provided by Halifax Water in Fax: 902 423 3938 2011 when they evaluated the Water Only option (between the Medium and Low Growth E-mail: [email protected] Scenarios) that was developed on your recommendation. www.cbcl.ca If you have any questions or comments, feel free to contact us. Yours very truly, CBCL Limited ISO 9001 Mike DeLay, P.Eng. Registered Company Senior Water Resources Engineer Direct: (902) 492 6754 E Mail: [email protected] Project No. 061034.01 061034 01-LE002 FINAL REPORT.DOC/VB ED: 5/23/2013 1:32:00 PM/PD: 5/23/2013 1:47:00 PM Contents CHAPTER 1 Introduction................................................................................................................ 1 1.1 Background ......................................................................................................................... 1 1.2 2007 Watershed Study ....................................................................................................... 1 1.3 Community Visioning.......................................................................................................... 2 1.4 Study Scope and Objectives................................................................................................ 2 1.5 Report Layout ..................................................................................................................... 3 CHAPTER 2 Existing Conditions...................................................................................................... 4 2.1 Existing Population ............................................................................................................. 4 2.2 Existing Development Patterns........................................................................................... 4 2.3 Wastewater Treatment ...................................................................................................... 4 2.3.1 Wastewater Treatment Facilities............................................................................ 4 2.3.2 Onsite Wastewater Treatment ............................................................................... 7 2.4 Stormwater ......................................................................................................................... 8 2.5 Water Supply ...................................................................................................................... 8 2.6 Receiving Water Quality ..................................................................................................... 8 CHAPTER 3 Growth in the Community......................................................................................... 11 3.1 Design Population and Number of Services ..................................................................... 11 3.2 Density of Population ....................................................................................................... 11 3.3 Preferred Development Areas.......................................................................................... 13 CHAPTER 4 Constraints on Central Services ................................................................................. 14 4.1 Receiving Water Quality ................................................................................................... 14 4.1.1 Potential Sources of Pollutants............................................................................. 14 4.1.2 Potential Reductions of Pollutants ....................................................................... 16 4.2 Source Water Supplies...................................................................................................... 17 4.2.1 River Aquifer Water Availability......................................................................... 17 4.2.2 River Aquifer Water Quality ............................................................................... 19 4.2.3 Potential Sources of Pollutants............................................................................. 21 CHAPTER 5 Central services ......................................................................................................... 25 5.1 Central Wastewater Collection and Treatment................................................................ 25 5.1.1 Wastewater Collection ......................................................................................... 25 5.1.2 Wastewater Treatment ........................................................................................ 26 5.2 Stormwater Collection...................................................................................................... 29 CBCL Limited Contents i 5.3 Water Supply, Treatment and Distribution ...................................................................... 29 5.3.1 Water Demands.................................................................................................... 29 5.3.2 Well Field Development ....................................................................................... 32 5.3.3 Water Quality Comparison and Treatment Objectives ........................................ 33 5.3.4 Water Treatment Plant Process Assessment........................................................ 36 5.3.5 Water Distribution ................................................................................................ 37 5.3.6 Central Water without other Services .................................................................. 37 5.4 Phased Implementation.................................................................................................... 38 5.5 Estimated Costs of Servicing............................................................................................. 39 5.5.1 Estimates of Probable Capital Costs ..................................................................... 39 5.5.2 Operating and Maintenance Costs ....................................................................... 39 5.5.3 Life Cycle Costing Analysis .................................................................................... 40 5.6 Sources of Funding............................................................................................................ 40 CHAPTER 6 Summary of Assessments.......................................................................................... 42 6.1 TOR Issues......................................................................................................................... 42 6.2 Proposed Water and Wastewater Systems...................................................................... 44 List of Tables* Table 2.3.1.1: Twin Oaks Wastewater Treatment Facility Effluent Sampling Results Table2.6: HRM Summer 2009Sampling Results at PetpeswickInlet Beach Table 3.2: Areas Required for Development Based on Population Estimates Table 3.3: Musquodoboit Harbour Development Scenarios Table 4.2.1(a): Estimated River Flow Regime for the Musquodoboit and Little Rivers Table 4.2.1(b): Comparison of Water Demand to Potential River Water Supply Table5.1: DesignofCentralServicing Table 5.1.2: Wastewater Treatment Plant Design Flows Table 5.1.3(a): Average Daily Flow Expected with Existing Population and Under Three Growth Scenarios Table 5.3.1(b): Maximum Daily Flow Expected with Existing Population and Under Three Growth Scenarios Table 5.3.2: Production Wells Required to Satisfy Expected Water Demands Table 5.3.3: Comparison of Groundwater and Surface Water Quality Table 5.5.1: Capital Costs of Central Servicing Table 5.5.2: Operating and Maintenance Costs Table5.6: LifeCycle Costs for Various Funding Alternatives CBCL Limited Contents ii List of Figures* Figure1.2: StudyArea Figure 2.3.1(a): Birches, Twin Oaks, Eastern Shore District High School Wastewater Treatment System Site Plan and General Arrangement Figure 2.3.1(b): Eastern Shore District Community Centre Wastewater Treatment System Site Plan Figure 2.4: Local Drainage and Receiving Water Sampling Locations Figure 3.2(a): Density Fact Sheet Suburban Development Figure 3.2(b): Density Fact Sheet Small Town, Neighborhood with Main Street Commercial Figure 3.2(c): Density Fact Sheet Traditional Urban Development Figure 3.2(d): Density Fact Sheet Urban Development Figure 3.2(e): Density Fact Sheet Urban Village Figure3.3: AreasforNewDevelopmentinCore Areas Figure 4.1: Hydrodynamic Model Domain of Petpeswick Inlet Figure 4.1.1: Modelled Contamination from Bacterial Loadings at the Head of Petpeswick Inlet Figure 5.1(a): Plan of Central Wastewater Collection, Secondary STP and Outfall Figure 5.1(b): Plan of Central Wastewater Collection, Tertiary STP and Outfall Figure 5.2: Planof Central Stormwater Collection Systems Figure
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