Class EA for Bayfield WWTF Expansion Environmental Study Report
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MUNICIPALITY OF BLUEWATER CLASS ENVIRONMENTAL ASSESSMENT FOR EXPANSION AND UPGRADING OF THE BAYFIELD SEWAGE TREATMENT FACILITY ENVIRONMENTAL STUDY REPORT MUNICIPALITY OF BLUEWATER CLASS ENVIRONMENTAL ASSESSMENT FOR EXPANSION AND UPGRADING OF THE BAYFIELD SEWAGE TREATMENT FACILITY ENVIRONMENTAL STUDY REPORT March 10, 2021 B. M. ROSS AND ASSOCIATES LIMITED Engineers and Planners 62 North Street Goderich, Ontario N7A 2T4 File No. 09051 Z:\09051-Bluewater-Bayfield_STP\WP\Class EA\ESR\09051-2021-03-10-FINAL.docx Table of Contents 1.0 INTRODUCTION ................................................................................................... 1 1.1 Purpose of Report .............................................................................................. 1 1.2 Environmental Assessment Process .................................................................. 1 1.3 Classification of Project Schedules .................................................................... 2 1.4 Environmental Study Report .............................................................................. 4 1.5 Mechanism to Request a Higher Level of Environmental Assessment .............. 4 1.6 Study Organization ............................................................................................. 4 2.0 BACKGROUND ..................................................................................................... 5 2.1 Study Area Description ...................................................................................... 5 2.1.1 Municipality of Bluewater ............................................................................. 5 2.1.2 Community of Bayfield ................................................................................. 5 2.1.3 Project Study Area Description .................................................................... 5 2.2 Historical Growth and Development ................................................................... 8 2.2.1 Official Plan Policies .................................................................................... 8 2.2.2 Existing Development Pattern ..................................................................... 8 2.2.3 Recent Growth Trends................................................................................. 8 2.3 Growth Forecast ............................................................................................... 13 2.3.1 Methodology .............................................................................................. 13 2.3.2 Household Growth Projections .................................................................. 13 2.3.3 Summary and Conclusions for Growth .......................................................... 14 2.4 Natural Heritage Features ................................................................................ 15 2.4.1 General Physiography ............................................................................... 15 2.4.2 Bayfield River ............................................................................................ 15 2.4.3 Areas of Natural and Scientific Interest (ANSI) .......................................... 16 2.4.4 Species at Risk Habitat.............................................................................. 16 2.4.5 Aquatic Species at Risk ............................................................................. 19 2.5 Source Water Protection .................................................................................. 20 2.6 Bayfield River Water Quality ............................................................................ 20 2.6.2 Benthic Analysis ........................................................................................ 21 2.6.3 Assimilation Study ..................................................................................... 22 2.7 Existing Sewage Facilities ................................................................................ 26 2.7.1 Collection System ...................................................................................... 26 2.7.2 Treatment Facilities ................................................................................... 27 2.8 Existing Operating Conditions .......................................................................... 29 2.8.1 Annual Raw Sewage Flow ......................................................................... 29 2.8.2 Contributions from Campgrounds .............................................................. 32 2.8.3 Leachate Discharged at WWTF ................................................................. 32 2.8.4 Maximum Day Flows ................................................................................. 33 2.8.5 Peak Rate Flows ....................................................................................... 33 2.8.6 Raw Sewage Characteristics ..................................................................... 34 2.8.7 Effluent Flows ............................................................................................ 34 2.8.8 Effluent Quality .......................................................................................... 35 2.9 Reserve Capacity Analysis............................................................................... 37 2.9.1 Methodology .............................................................................................. 37 2.9.3 Uncommitted Reserve ................................................................................... 37 2.10 Review of Extraneous Flows ......................................................................... 38 2.10.1 Background ............................................................................................ 38 2.10.2 System Response to Precipitation Events .............................................. 39 2.10.3 Summary re Extraneous Flows .............................................................. 40 2.11 Design Sewage Flows .................................................................................. 41 2.11.1 Background ............................................................................................ 41 2.11.2 Existing Flow .......................................................................................... 41 2.11.3 Potential I-I Reduction ............................................................................ 41 2.11.4 Unit Flow for Growth ............................................................................... 42 2.11.5 Growth Projections ................................................................................. 42 2.11.6 Sewage Flow Design Values .................................................................. 42 3.0 CLASS EA STUDY FRAMEWORK ..................................................................... 45 3.1 Study Initiation .................................................................................................. 45 3.2 Phase 1 – Problem Definition ........................................................................... 45 3.3 Phase 2 – Identification of Alternative Solutions .............................................. 45 3.4 Preliminary Evaluation of Alternatives .............................................................. 47 3.4.1 General ......................................................................................................... 47 3.4.2 Alternative 1: Reduce Wastewater Quantities from the Existing Community47 3.4.3 Alternative 2: Limit Community Growth..................................................... 47 3.4.4 Alternative 3: Expand Existing Wastewater Treatment Facility ................. 48 3.4.5 Alternative 4: Construct New Treatment Facilities .................................... 48 3.4.6 Alternative 5: Re-Rate the Existing Facility ............................................... 49 3.4.7 Alternative 6: Do Nothing .......................................................................... 50 3.4.8 Summary of Preliminary Review of Alternatives ........................................ 50 3.5 Environmental Considerations ......................................................................... 50 3.5.1 General ...................................................................................................... 50 3.5.2 Summary of Environmental Review ........................................................... 52 3.6 Identification of a Preferred Solution ................................................................ 60 4.0 PHASE 3 – REVIEW OF ALTERNATIVE DESIGN CONCEPTS ........................ 61 4.1 General ............................................................................................................ 61 4.2 Design Wastewater Quantities ......................................................................... 61 4.2.1 Design Flow Basis ..................................................................................... 61 4.2.2 Design Wastewater Volume ...................................................................... 62 4.2.3 Approach to Staging .................................................................................. 63 4.3 Wastewater Treatment Facility Design ............................................................. 63 4.3.1 General ...................................................................................................... 63 4.3.2 Effluent Quality Criteria .............................................................................. 64 4.3.3 Treatment Process Selection ....................................................................