ENVIRONMENTAL IMPLEMENTATION REPORT AND FUNCTIONAL SERVICING STUDY FOR THE GRAYDON BANNING AND SHEVCHENKO LANDS NORTH OAKVILLE SIXTEEN MILE CREEK

Transcription

1 ENVIRONMENTAL IMPLEMENTATION REPORT AND FUNCTIONAL SERVICING STUDY FOR THE GRAYDON BANNING AND SHEVCHENKO LANDS NORTH OAKVILLE SIXTEEN MILE CREEK Prepared by Stonybrook Consulting Inc. Bird and Hale Limited R. J. Burnside & Associates Limited AquaLogic Stantec Consulting Ltd.

2 Table of Contents 1.0 INTRODUCTION Study Purpose EIR Subcatchment Area and FSS Study Area EIR Subcatchment Areas Functional Servicing Study Area EIR / FSS Study Objectives EIR/FSS Study Team Previous Studies, Reports and Planning Documents EIR/FSS Preconsultation Meeting NATURAL HERITAGE SYSTEM FRAMEWORK Natural Heritage System Components Greenbelt and Glenorchy Conservation Area Permitted Uses in the Natural Heritage System CORE Approach to Core Delineation Core 3 Boundary Characterization of Core 3 within the EIR Study Area NOCSS Core 3 Management Recommendations GEOLOGY AND HYDROGEOLOGY Scope of Work Physiography and Topography Climate Drainage and Surface Water Flow Conditions Geology Stratigraphy Surficial Geology Bedrock Geology Hydrogeology Local Groundwater Use 4-7 i

3 4.6.2 Groundwater Levels Groundwater Flow Conditions Hydraulic Conductivity Recharge and Discharge Conditions Water Quality Groundwater Quality Surface Water Quality STREAM SYSTEMS, FISH HABITAT AND FISH COMMUNITIES Overview of Sixteen Mile Creek Characteristics Existing Drainage Conditions Comparison of EIR/FSS Drainage Area to NOCSS Drainage Area Confirmation of Sixteen Mile Creek Reach Breaks Characteristics of Sixteen Mile Creek Stream Reaches Red Stream Reaches Stream Corridor Boundaries Methodologies Meander Belt Allowance Calculations Presence of Existing Physical Top-of-Bank and Stable Slope Calculations Regulatory Floodplain Fisheries Setback Requirements Hydrologic Features A Corridor Boundaries Sixteen Mile Creek Valley Sixteen Mile Creek Meander Belt Limits and Erosion Allowance LAND USE General Description of Draft Plan/Development Concept Trail Planning Location of Trails in NHS GRADING, DRAINAGE AND STORMWATER MANAGEMENT OPA 272 and NOCSS Recommendations 7-23 ii

4 7.2 Updated Subcatchment Boundaries Pre-Development Flows and Dundas Street Culvert Capacities Pre-Development Flows Dundas Street Culvert and Sewer Capacities Dundas Street Culverts Dundas Street Storm Sewer Stormwater Management Plan Selection Process Erosion Control Analysis Stormwater Management Plan Background/Previous Studies Graydon Banning East Graydon Banning West SWM Alternatives Residential Areas Description of Alternatives Pond Design and Outflow Rates Conveyance of Minor System Flows Conveyance of Major System Flows Preliminary Grading Plans SWM Pond Operating Characteristics Pond Design Elements Comparison of Topographic Depression Volumes to SWM Pond Design Operations and Maintenance GROUNDWATER BUDGET Water Budget Components Approach and Method Component Values Pre-Development Recharge (Existing Conditions) Potential Development Impacts to Water Budget Post-Development Water Budget Water Budget Impact Assessment Water Quantity Water Quality Private Services Water Balance Mitigation Measures 8-8 iii

5 9.0 WASTEWATER AND WATER SERVICING North Oakville East Area Servicing Plan (ASP) Wastewater Servicing Wastewater Design Criteria Existing Wastewater Services External Wastewater Requirements Proposed Wastewater Servicing Water Servicing Water Supply Design Criteria Pressure Zone Boundaries Existing Water Supply External Water Supply Requirements Proposed Water Servicing Interim Water Servicing ROADS Policy Direction Creek Road Crossing Design Requirements Road Crossing Location Recommended Creek Crossing Sizing Road Crossing Fluvial Geomorphology Design Requirements Road Crossing Requirements for Wildlife Passage Preliminary Natural Channel Design Road Crossing Hydraulic Design Requirements Road Allowance Design Sidewalk Design Utility Crossings of Creek CONSTRUCTION PRACTICES Summary of Key Geotechnical Findings Erosion and Sediment Controls Construction Phasing 11-4 iv

6 11.4 Dewatering Requirements Private Water Wells Well Decommissioning MONITORING PROGRAM OPA 272 Monitoring Requirements NOCSS Monitoring Requirements Proposed Monitoring Erosion and Sediment Control Stormwater Management Facilities Monitoring in Relation to Municipal Services and Trails Installed by an Owner within the NHS SUMMARY OF RECOMMENDATIONS 13-1 v

7 LIST OF TABLES Table Existing Subcatchment Areas 1-4 Table FSS Study Area 1-5 Table Table Pits, Ponds and Depressions 2-13 Table Summary of Policy Direction on NHS Permitted Uses 2-9 Table Core 3 Areas by Subcatchment 3-4 Table West Portion Core 3 Habitat Types 3-4 Table Reaches within Study Areas 5-2 Table Comparison of NOCSS and EIR/FSS Drainage Areas 5-7 Table Summary of EIR Subcatchment Areas 5-7 Table Characteristics of Red Stream Reaches 5-9 Table Summary of Stream Corridor Boundary Delineation 5-13 Table North Oakville Creeks Subwatershed Study 7-24 Table Pre-Development Flows at Dundas Street, Glenayr Creek 7-34 Table Summary of SWM Alternative Drainage Areas and Outlets** 7-42 Table Pond 5 Target Flows, Alternative A 7-44 Table Pond 5 Target Flows, Alternative B 7-44 Table Pond 5A Target Flows, Alternative A 7-45 Table Pond 5A Target Flows, Alternative B 7-45 Table SWM Pond 5 Flow Rate and Storage, Alternative A 7-53 Table SWM Pond 5 Flow and Storage, Alternative B 7-54 Table SWM Pond 5A Flow and Storage, Alternative A 7-54 Table SWM Pond 5A Flow and Storage, Alternative B 7-55 Table Water Budget Component Values 8-4 vi

8 Table Summary of Recharge Volume Calculations 8-6 Table Summary of Completed Regional Wastewater Infrastructure 9-2 Table Summary of Zone Elevations 9-5 Table Summary of Existing Watermains 9-5 Table Summary of Completed Regional Water Infrastructure 9-6 Table Proudfoot Trail Construction within the Glenayr Creek Corridor 10-5 Table Proudfoot Trail within Wetland Buffer Area 10-6 Table Design Recommendations for Proudfoot Trail Creek Crossing 10-7 Table Summary of EIR/FSS Recommendations and Mitigative Measures 13-2 vii

9 LIST OF FIGURES AND DRAWINGS Figure 1.1 Figure 1.2 Figure Figure 1.3 Figure 2.1 Figure NOE3 Figure NOW3 Figure 4.1 Figure 4.2 Figure 4.3 Figure 4.4 Figure 4.5 Figure 4.6 Figure 4.7 Figure 5.1 Figure 5.2 Figure 5.3 Figure 5.4 Figure 6.1 Figure 6.2 Figure 6.3 Figure 6.4 Figure 7.1 Figure 7.2A Figure 7.2B Figure 7.3A Figure 7.3B Figure 7.4 Figure 7.4A Figure 7.4B Figure Figure 7.5 Figure 7.6 Figure 7.7 Location of Subject Lands EIR Subcatchment Areas and FSS Study Area EIR Subcatchment Plan from NOCSS Land Ownership Plan Natural Heritage System Framework Natural Heritage Component of Natural Heritage and Open Space System Including Other Hydrological Features Natural Heritage Component of Natural Heritage and Open Space System Including Other Hydrological Features Drilling and Monitoring Locations Topography and Drainage Surficial Geology Cross Section Location Key Schematic Geological Cross Section A-A Schematic Geological Cross Section B-B Interpreted Groundwater Flow Natural Heritage Components and EIR Subcatchments Pre-Development Drainage Areas Vegetation Conditions Vegetation Conditions North Oakville Master Plan Graydon Banning Draft Plan of Subdivision Draft Plan and Development Concepts Sidewalk/Trail Location Plan External Storm Sewer Projects Post Development Drainage Areas Alternative A Post Development Drainage Areas - Alternative B Conceptual Design of SWM Pond 5 Alternative A Conceptual Design of SWM Pond 5 - Alternative B Pond 5A Conceptual Desing of SWM Pond 5A Alternative A Conceptual Design of SWM Pond 5A Alternative B Unit Flow Rate Target Locations from NOCSS Pond 5 Outfall Proudfoot Trail Outfall, Employment Lands Sump Pump Detail viii

10 Figure 9.1 Figure 9.2 Figure 10.1 Figure 10.2 Figure 10.3 Figure 10.4 Figure 10.5 Figure 10.6 Figure 10.7 Figure 10.8 Conceptual Wastewater Servicing Conceptual Watermain Servicing Proudfoot Trail Road and Services Crossing of the NHS Glenayr Creek Corridor and Proudfoot Trail Proudfoot Trail Road Crossing Concept Channel Design Schematic Plan View Proudfoot Trail Road Crossing Concept Open Bottom Culvert Section View Proudfoot Trail Road Crossing Concept Channel Design Cross-Section Schematics Raptor Pole Schematic Large Woody Debris and Boulder Placement Schematic 11.0m Local Road, 6.0m pavement Drawing 1 Drawing 2 Drawing 3A Drawing 3B Drawing 3C Drawing 3D Drawing 3E Comparison of Drainage Areas Conceptual Grading Plan Trails Grading Strip Plan, North of William Halton Parkway Trails Grading Strip Plan, North of William Halton Parkway Trails Grading Strip Plan, North of William Halton Parkway Trails Grading Strip Plan, South of William Halton Parkway Trails Grading Strip Plan, South of William Halton Parkway Drawing Core 3-NHS-1 Drawing 16WA-1, NHS-1 Core 3 NHS Limits, Graydon Banning/Shevchenko/CHWO Lands Stream Reach 16WA-1NHS Limits, Graydon Banning Ltd. ix

11 LIST OF APPENDICES Appendix A Supporting Documentation Appendix A-1 EIR/FSS Terms of Reference, May 2013 Appendix A-2 EIR/FSS Pre-consultation at North Oakville Agency Review Agenda Appendix A-3 Grading within the NHS Memorandum, Bird and Hale, March 2012 Appendix B Core Delineation Correspondence Appendix B-1 December 22, 2014 Core Submissions and CH Comments, July 20, 2015 Appendix B-2 Stantec (October 30, 2015) and AME (October 30, 2015) Responses to CH Comments Appendix C Hydrogeology Appendix C-1 Ministry of Environment and Climate Change Water Well Records Appendix C-2 Monitoring Well Logs Appendix C-3 Hydraulic Conductivity Tests Appendix C-4 Groundwater Elevations Appendix C-5 Surface Water Monitoring Appendix C-6 Water Quality Appendix C-7 Groundwater Balance Appendix D Ground Photos Appendix D-1 Ground Photos of Stream Reach 16WA-1 Appendix E Fluvial Geomorphology Appendix E-1 Geomorphic Setback Analysis Glen Oak Creek and Sixteen Mile Creek Tributary Halton Healthcare Services Oakville Hospital, AquaLogic Consulting, October Appendix E-2 Recommended Stone Sizing Calculations Appendix F Hydraulics Appendix F-1 HECRAS Model of 16WA-1, New Proudfoot Trail Road Crossing Appendix G SWMHYMO Model and Pond Sizing Appendix G-1 Existing Regional Storm Sewer Capacity Appendix G-2 West Employment Lands SWM Requirements Appendix G-3 SWMHYMO Model and Target Flow Calculations Appendix G-4 Pond Design Calculations Appendix H Wastewater Design Sheets Appendix I Geotechnical Reports x

12 Appendix I-1 Appendix I-2 Preliminary Geotechnical Investigation, Proposed Residential Development, Graydon Banning Property, Dundas Street West and Third Line, Oakville Ontario, prepared by AMEC Earth & Environmental, February 1, 2006 Supplementary Geotechnical Investigation Report, Graydon Banning Property, Dundas Street West, Oakville Ontario, prepared by Shad & Associates Inc., June 9, 2015 Appendix J Stable Slope Analysis Appendix J-1 Appendix J-2 Slope Stability Assessment 16 Mile Creek Tributary SM1117 Graydon Banning Property (December 17, 2014, revised October 5, 2015) Slope Stability Analysis South Valley Slope of Sixteen Mile Creek Graydon Banning Property January (Revision Issue October 8, 2015) Appendix K Water Distribution Analysis Appendix K-1 Graydon Banning Water Distribution Analysis, WSP, October 13, 2015 xi

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14 1.0 INTRODUCTION 1.1 Study Purpose This Environmental Implementation Report (EIR) and Functional Servicing Study (FSS) is being prepared in accordance with the requirements of the Town of Oakville s (the Town ) Official Plan Amendments 272 (OPA 272) and 289 (OPA 289) for portions of the lands located in the North Oakville East Secondary Plan Area and North Oakville West Secondary Plan Area illustrated on Figure 1.1. These parcels of land are owned by Graydon Banning Ltd., Taras H. Shevchenko Museum and Memorial Park Foundation ( Shevchenko ) and CHWO Radio. The Subject Lands consist of two participating landowners, the Graydon Banning tablelands and the Shevchenko lands. These lands encompass a combined gross area of approximately 31 ha. The FSS Study Area consists of the Subject Lands and the CHWO Radio lands (nonparticipating landowner). These three properties are located north of Dundas Street, east of Proudfoot Trail and west of the Main Sixteen Mile Creek. They are largely located within the western portion of the North Oakville East Secondary Plan area, west of Sixteen Mile Creek. The Graydon Banning lands located west of the Sixteen Mile Creek western tributary (16WA-1) are a part of the North Oakville West Secondary Plan area (Official Plan Amendment 289). The future William Halton Parkway bisects the FSS Study Area and is also considered in this EIR/FSS. The EIR/FSS has been prepared to address the following OPA 272/289 policy requirements in support of the approvals of Draft Plans of Subdivision for the Subject Lands. Policy a) requires that an EIR be prepared for each subcatchment area, in accordance with the directions established in the Implementation Report, North Oakville Creeks Subwatershed Study (NOCSS), dated August Policy b) requires that a FSS be completed. The FSS must include a preferred servicing plan based on an analysis of servicing requirements, in accordance with any approved Class Environmental Assessment Studies, Halton Transportation Master Plan and the Master Servicing Plan for the North Oakville East Planning Area, and including: 1-1

15 i. servicing design requirements; ii. iii. iv. preliminary sizing of water and wastewater infrastructure; layout for roads and other transportation systems, including transit and trails; and; preliminary sizing and location of stormwater management (SWM) facilities and integration with environmental features and development areas. Policy a) iii) requires that EIRs be prepared in accordance with the Terms of Reference (TOR) approved by the Town, the Region of Halton (the Region) and the applicant(s), in consultation with Conservation Halton (CH). The work completed as part of this EIR/FSS and documented in this report, was guided by requirements set out in the EIR/FSS TOR (August 2007; revised May 2013 with respect to trails requirements) approved by the Town and CH, and is intended to satisfy the above policy requirements of OPA 272 and 289. A copy of the approved TOR is provided in Appendix A-1. The purpose of the EIR is to characterize and analyze the natural heritage features and functions within the Study Area and to determine and address the potential impacts of a proposed development application, including servicing requirements, on the Natural Heritage System (NHS). The purpose of the FSS is to identify servicing requirements related to roads, water supply, sanitary sewers, storm drainage, stormwater, and site grading. Further, the purpose of both the EIR and FSS is to provide a link between the Town s NOCSS Management Report and Implementation Report, the North Oakville East Secondary Plan, and the required planning approvals. As set out in the TOR, the EIR/FSS has been prepared as a joint report to fully integrate environmental and engineering recommendations to protect the function of the NHS and service the Subject Lands. The EIR/FSS is intended to assist in the development of Draft Plans of Subdivision, address the requirements of the NOCSS and the Secondary Plans, and ensure that the site characteristics are understood in sufficient detail to provide the information necessary to process draft plans and identify conditions of approval. In this regard, this EIR/FSS has been prepared in support of the Graydon Banning Draft Plan of Subdivision prepared by Korsiak Urban Planning, dated October 5, 2015 and the Shevchenko development concept. Draft Plans of Subdivision for the Shevchenko and CWHO lands are not currently being submitted, however, the development concept shown on Figure 6.3 has been coordinated with the planner, Grant Morris Associates, 1-2

16 for the Shevchenko lands. For the purposes of this EIR/FSS, the development concept for the CHWO lands was prepared by Korsiak Urban Planning, consistent with the Town s Master Plan. Due to the varying timeframes for development with the FSS Study Area, further study, including potential Addendums to this EIR/FSS, will be required to support draft plan approval of the Shevchenko and CWHO lands. Based on the extent of environmental and servicing work completed as part of this EIR/FSS specific to the Shevchenko lands, this further study may only require confirmation that information contained in this Final EIR/FSS remains current and is consistent with their future draft plan application. It may be necessary to confirm the core boundary on the northeast corner of the Shevchenko lands. Where their Draft Plan may deviate from the development concept shown in this EIR/FSS, an update to servicing plans may be required. For the CWHO lands where the same degree of EIR/FSS analyses has not been included in this EIR/FSS, additional study requirements will include environmental analyses addressing field verification of NHS boundaries, confirmation of servicing, grading, SWM pond design, and consistency with this EIR/FSS. Prior to the preparation of further studies, the specific scope of study should be addressed with the Town and Conservation Halton. 1.2 EIR Subcatchment Area and FSS Study Area EIR Subcatchment Areas The EIR/FSS TOR differentiates between the Study Area for the FSS and the Subcatchment Study Area for the EIR. The EIR is to be completed on a subcatchment basis. The NOCSS provides direction to the preparation of EIRs, including the delineation of EIR Subcatchment Areas. Figure from the NOCSS Addendum (included at the end of this section) illustrates the EIR Subcatchment Areas. With reference to Figure and direction from the TOR, the appropriate EIR Subcatchment Areas for this EIR/FSS are defined to be the Sixteen Mile Creek subcatchments, SM1117a/SM1117 and 16MC. A label for the 16MC subcatchment has been added to Figure to illustrate this area (it was not labelled on NOCSS figures). NOCSS inconsistently labels the SM1117a subcatchment (NOCSS Figure labels it SM1117a; NOCSS Figure labels it SM1117a, SM1117 and SM1118; and NOCSS Table refers to the areas as SM1117a, SM1117 and SM1118). For the purposes of this EIR/FSS, this EIR/FSS Subcatchment Area has been referred to as SM1117a/SM1117 as defined on Figure or collectively refers to it as the Glenayr Creek subcatchment. This is discussed further in Section 5.1 of this EIR/FSS. The subcatchments are illustrated on Figure 1.2. The Subject Lands lie within these two subcatchments. The limits of these subcatchments, within and adjacent to the Subject Lands, are illustrated on Figure 1.2 based on EIR/FSS 1-3

17 interpretation of drainage boundaries. Table lists the EIR Subcatchment Areas as well as portions of these subcatchments within the Subject Lands. Table Existing Subcatchment Areas Area Subcatchment Areas Glenayr Creek (Subcatchments SM1117a/ SM1117) 16 Mile Creek (Subcatchment 16MC) Total Subcatchment Area (ha) Subject Lands (ha) (total landholding) Percentage (%) of Subject Lands in each subcatchment These EIR Subcatchment Areas were discussed with the Town of Oakville and Conservation Halton at an EIR/FSS preconsultation meeting held on December 15, 2014, see Section 1.6 and refer to Appendix A-2 for meeting materials Functional Servicing Study Area FSS will address specific servicing requirements in support of draft plans of subdivision and therefore FSS Study Area boundaries generally follow the extent of ownership of the landowner(s) preparing the FSS, specifically Graydon Banning and Shevchenko. In this case, due to the configuration of the Subject Lands, additional lands owned by others also form part of the FSS Study Area, specifically the CHWO Radio Lands. The ownership of the lands is shown on Figure 1.4. Table notes the extent of the FSS within each subcatchment. 1-4

18 Table FSS Study Area Area Existing Subcatchment Area Glenayr Creek (Subcatchment SM1117a/SM1117) 16 Mile Creek (Subcatchment SM1118*/16MC) Total EIR Subcatchment Area (ha) FSS Study Area (ha) Percentage of FSS Study Area in subcatchment (%) *following recent completion of Dundas Street widening, subcatchment SM1118 drains directly to the Main Sixteen Mile Creek valley via a new storm sewer system 1.3 EIR / FSS Study Objectives The objectives to be fulfilled by the EIR/FSS are set out in the approved TOR. They are: to demonstrate how the subwatershed requirements set out in the NOCSS Management Report (including targets), the Implementation Report, and the Secondary Plan are being fulfilled in all proposed Draft Plans; to provide sufficient level of conceptual design to ensure that the various components of the NHS and infrastructure can be implemented, as envisaged in the NOCSS and Secondary Plan, and to ensure that the Draft Plans are consistent with this conceptual design; to ensure servicing requirements, as determined in the FSS for the areas external to the Draft Plan, are adequate; to identify details regarding any potential development constraints or conflicts and how they are to be resolved; to provide any further implementation details as needed; to streamline the Draft Plan approval process; and, to facilitate the preparation of Draft Plan conditions. 1-5

19 1.4 EIR/FSS Study Team A multi-disciplinary study team has analyzed the environment and servicing of the Study Areas. Their responsibilities include: Stonybrook Consulting Inc. Lead consultant addressing limits of development, study integration and team management; Bird and Hale Limited - addressing aquatic and terrestrial ecology; R. J. Burnside & Associates Limited addressing geology and hydrogeology; AquaLogic Consulting addressing fluvial geomorphology and natural channel design; Stantec Consulting Ltd. addressing municipal servicing, SWM and site grading, existing drainage boundaries, existing floodplain mapping, and existing limit of development; Korsiak & Company addressing municipal planning matters and preparing the draft plan of subdivision; and, NAK Design addressing landscape design, parks, and trail planning. 1.5 Previous Studies, Reports and Planning Documents The following approved studies/guidelines/documents were reviewed in preparation of this EIR/FSS. A complete listing of references is provided at the end of this report: Town of Oakville Draft North Oakville Creeks Subwatershed Study, August 2006; Town of Oakville Draft North Oakville Creeks Subwatershed Study Addendum (Draft), September 2007; Ontario Municipal Board Mediation Agreements, 2007; Town of Oakville Official Plan Amendment 272 (August 2007); Town of Oakville Official Plan Amendment 289 (May 2009); Town of Oakville North Oakville Trails Plan (May 2013) Region of Halton Official Plan Amendment 25; Ontario Municipal Board Minutes of Settlement, June 2006 and August 2007; North Oakville Environmental Implementation Report and Functional Servicing Study Terms of Reference, August 2, 2007; 1-6

20 North Oakville East Subwatersheds Study, prepared for the North Oakville Landowners Group, August 2004; Halton Water and Wastewater Master Plan Review, KMK Consultants Limited, October 2002 (Master Plan); South Halton Water and Wastewater Master Plan Update; Region of Halton, 2007 (Master Plan Update); Conservation Halton s Policies, Procedures and Guidelines for the Administration of Ontario Regulation 162/06 (April 27, 2006); Stormwater Management Planning and Design Manual, Ministry of Environment, March 2003 (SWMP Design Manual); Development Engineering Procedures & Guidelines Manual, Town of Oakville; Design Criteria, Contract Specifications and Standard Drawings, Region of Halton, February 2001 (updated 2007); Erosion and Sediment Control Guidelines for Urban Construction, Conservation Halton et al, December 2006; Taplow Creek, Glen Oak Creek and 16 Mile Creek Environmental Implementation Report and Functional Servicing Study, Proposed Hospital Development (HHS), Stantec Consulting Ltd, December 2010; As-Built Drawing - Construction Dundas Street in the Town of Oakville, From 50m East of Fourth Line to 350m East of Fourth Line. AquaLogic Consulting Sixteen Mile Creek Tributary Erosion Threshold Analysis, Glen Oak Creek & Sixteen Mile Creek Tributary Natural Channel Design, Halton Healthcare Services, Oakville Hospital, Town of Oakville. Report to Stantec Consulting Limited, March 1, Ontario Ministry of Natural Resources (MNR), Water Resources Section Technical Guide - River & Stream Systems: Erosion Hazard Limit. Ontario Ministry of Transportation (MTO) Highway Drainage Design Standards. Ontario Ministry of Transportation (MTO) Environmental Guide for Fish and Fish Habitat. 1-7

21 1.6 EIR/FSS Preconsultation Meeting On December 15, 2014, the EIR /FSS Study Team met with the Town of Oakville and Conservation Halton (CH) to review a number of EIR/FSS related matters including the boundaries of the EIR Subcatchment Area and FSS Study Area, the Natural Heritage framework, the comparisons of drainage areas to NOCSS drainage areas, limit of development plans, the scope of the erosion assessment, and site visits to delineate environmental features. Input provided by the Town and CH was considered through the preparation of this EIR/FSS. Refer to Appendix A-2 for meeting agenda outlining topics discussed. 1-8

22 2.0 NATURAL HERITAGE SYSTEM FRAMEWORK 2.1 Natural Heritage System Components OPA 272, the Town of Oakville North Oakville Creeks Subwatershed Study (NOCSS) and the North Oakville Creeks Subwatershed Study Addendum (NOCSS Addendum) provide policies and/or directions with respect to the protection and management of the North Oakville East Natural Heritage/Open Space System. The NOCSS is divided into four sections, which follow the four phases of a subwatershed management approach. They include Characterization, Analysis, Management Strategy and Implementation. The Management Strategy outlines requirements with regard to lands restricted from development, lands with development limitations or constraints, stormwater management, input to land use policies and servicing requirements. The Implementation Plan outlines the implementation requirements for the recommended management strategy, studies needed in subsequent stages of the development process, environmental reporting requirements, agency responsibilities, and the approval process with the Town of Oakville, Halton Region and Conservation Halton, and, where applicable, the MNRF and DFO. With respect to the Subject Lands and the EIR Subcatchment Area, both OPA 272 (North Oakville East) and OPA 289 (North Oakville West) apply, as the secondary plan boundary falls along the stream boundary (reaches 16WA-1A, 16WA-A; see Figure 2.1). The natural heritage implications and mapping for the Subject Lands are the same in OPA 272 and OPA 289. These OPAs and NOCSS and NOCSS Addendum identify various environmental features to be protected and/or studied further during the EIR/FSS. With reference to Figure NOE3 from OPA 272 (located at the end of the report)(information on Figure NOW3 from OPA 289 presents the same information for the Study Areas), the following components of the Natural Heritage System (NHS) are located within the EIR Subcatchment Area or FSS Study Area. Figure 2.1, Natural Heritage System Framework Subject Lands, illustrates these features on a current aerial photograph base. Core Preserve Area Core Preserve Areas include key natural features or groupings of key natural features, together with required buffers and adjacent lands intended to protect the function of those features and ensure the long term sustainability of the Natural Heritage component of the System within the urban context. Core 3 or Sixteen Mile Creek Valley is located partially in the northern portion of the Subject Lands. The Core 3 southern/southwestern boundary forms the northern/ northeastern boundary of the FSS Study Area. This Core contains the natural 2-9

23 communities associated with Sixteen Mile Creek between Dundas Street and Hwy 407 to the north. It is composed of wooded areas, wetlands, active agricultural lands, cultural meadows and thickets. Linkage and Optional Linkage Preserve Areas Linkage and Optional Linkage Preserve Areas include areas which are designed to link the Core Preserve Areas together to maintain and enhance their environmental sustainability. They follow natural features whenever possible and are intended to be of sufficient size and character, including buffers, to ensure the functionality and sustainability of the Natural Heritage System. There is no Linkage Preserve Areas (LPA) or Optional Linkage Preserve Areas (OLPA) in the Study Areas. High Constraint Steam Corridor (Red Stream) High Constraint Stream Corridor Areas include certain watercourses and adjacent riparian lands, including buffers measured from the stable top-of-bank or meander belts. These areas are located primarily inside Core, Preserve Areas, and LPAs, but are also found outside such areas, as per OPA 272. They are to be protected in their existing locations for hydrological and ecological reasons. There are six Red Stream reaches located within the EIR Subcatchment Areas, only one of which is located in the FSS Study Area: - Stream reaches 16WA-1 and 16WA-1A are situated in the southwestern corner of the Study Areas within Subcatchment SM1117a.SM1117. Reach 16WA-1 is entirely within the Subject Lands, with the majority of reach 16WA-1A occurring on lands to the west. Reach 16WA-1 will be protected within a NHS corridor within the FSS Study Area. Reach 16WA-1A is located within the Glenorchy Conservation Area, which is within the Greenbelt (see discussion, below). - Stream reach 16WA-8 is located near the northern limits of Subcatchment SM1117a/SM1117 within Core 3, well north of the FSS Study Area. - Stream reaches 16W-1, 16W-2 and 16W-3 are within Sixteen Mile Creek (SMC) Subcatchment near its northern limits, within Core 3, well north of the FSS Study Area. Section 5.0 of this EIR/FSS addresses the character, designation, management, and protection of these Red Streams in the Study Areas. 2-10

24 Medium Constraint Stream Corridor (Blue Stream) Medium Constraint Stream Corridor Areas include certain watercourses and adjacent riparian lands, including buffers measured from the stable top-of-bank or meander belts. These areas are located primarily inside Cores and LPAs, but are also found outside such areas. As set out in OPA 272 policies, these watercourses may be deepened and/or relocated, but must be left open for hydrological and ecological reasons. There are no Blue Streams in the Study Areas. Other Hydrological Features - In addition to the High and Medium Constraint Stream Corridor Areas, there are a number of other hydrological features that also form part of the Natural Heritage and Open Space System to the extent that they are maintained after development occurs. These Features include Low Constraint Streams, Hydrologic Features A and Hydrologic Features B as follows: - Low Constraint Stream Corridor (Green Stream) These streams do not need to be maintained, but the function of the watercourse must be sustained in accordance with the directions established in the NOCSS and Federal, Provincial and Conservation Authority regulations. There are eight Green Stream reaches identified by NOCSS within the Study Areas. They are 16WA-5 / 16WA-6/16WA-7 / 16WA-8A; 16WA-2 / 16WA3 / 16WA-4; and, 16W-4. OPA 272 notes that Green Streams do not need to be maintained, although stream density targets, as established by the NOCSS, must be met. These stream reaches are discussed in Section 5. - Hydrologic Feature A Hydrologic Features A are defined in NOCSS to be hydrological features located within Blue or Red Streams. The NOCSS (page 7-5) states, Hydrologic Features A have hydrological functions and consequently both their form and function shall be considered through hydrological and hydrogeological assessment as part of an EIR. This review will also consider the ecological benefits of these features. Further, any required buffers associated with these features will be determined through the preparation of the EIR, and will only be related to the hydrologic function of the feature. OPA 272 notes that Hydrologic Features A form part of High Constraint and Medium Constraint Stream Corridor Areas and serve a key hydrological purpose. It states that, If a Medium Constraint Stream Corridor Area in which a Hydrologic Feature A is located is to be moved or rehabilitated, it is intended that the Hydrologic Feature A will be reconstructed in the relocated or rehabilitated stream corridor such that the form and function of the Hydrologic Feature A is retained or enhanced. The 2-11

25 reconstruction of the Hydrologic Feature A shall be carefully considered through a detailed hydrological and hydrogeological assessment as part of the Environmental Implementation Report. This assessment will also include an evaluation of any ecological benefits of the Feature. There is one Hydrologic Feature A within the Study Areas. It is located along stream reach 16WA-1A, occupying approximately the same footprint as a wetland area (PSW 140) along that channel. - Hydrologic Feature B Hydrologic features not associated with the NHS, are called Hydrologic Feature B. The NOCSS states, Hydrologic Features B may be relocated and consolidated with other wetlands, water features or SWM facilities. OPA 272 further states, Hydrologic Features B may be relocated and consolidated with other wet features, wetlands or stormwater management ponds, provided the hydrologic function of the feature is maintained. As indicated on OPA 272 Figure NOE3, there are four Hydrologic Features B (HYDFB) within the FSS Study Area (Figure 2.1). These four features, along with the Topographic Depressions (addressed below) are summarized in Table below. Section addresses these features. - Topographic Depressions Topographic depressions do not form part of the NHS, however, NOCSS identifies topographic depressions, ponds and pits (DPP) that must be addressed as part of the stormwater management system design. Constructed ponds do not have to be included in the assessment of depression storage. Within the EIR Subcatchment Areas, there are three topographic depressions identified on Figure A attached to Mediation Item: Depression Storage (May 30, 2007) that are not a Hydrologic Feature A or B. These depressions (D-156, D-167, P-160) are illustrated on Figure 2.1. As indicated in Table 2.1.1, there are two HYDFB features that will be eliminated 1 within the FSS Study Area and an additional two HYDFB features that would be eliminated when the non-participating CHWO Radio Limited lands develop. 1 These two HYDFB represent the historical sewage lagoons that already have been removed from the Subject Lands. 2-12

26 The storage available in Hydrologic Features B that will be eliminated is addressed in Section herein. Table Table Pits, Ponds and Depressions Feature Type * Feature Identification Catchment Origin Comment HYDFB Sewage Lagoon D-161 SM1117a/ SM1117 Constructed This feature already has been removed (i.e., the former lagoons have been decommissioned). HYDFB Sewage Lagoon D-162 SM1117a/ SM1117 Constructed This feature already has been removed (i.e., the former lagoons have been decommissioned). HYDFB B-CHWO1 16MC Unknown Outside of Subject Lands no access available. As per the Master Plan, to be eliminated when those lands develop. To be addressed when development application proceeds for the CHWO lands. HYDFB B-CHWO2 16MC Unknown Outside of Subject Lands no access available. As per the Master Plan, to be eliminated when those lands develop. To be addressed when development application proceeds for the CHWO lands. DPP D-156 SM1117a/ SM1117 DPP D-157 SM1117a/ SM1117 DPP P-160 SM1117a/ SM1117 Unknown Unknown Unknown Outside of Subject Lands. Feature is within NHS so will not be altered. Outside of Subject Lands. Feature is within NHS so will not be altered. Outside of Subject Lands. Feature is within NHS so will not be altered. 2.2 Greenbelt and Glenorchy Conservation Area In January 2013, the Province announced an expansion of the Greenbelt. In North Oakville, the expansion included the addition of 265 hectares of land, to comprise the Glenorchy Conservation Area. The Glenorchy Conservation Area/additional Greenbelt lands in the vicinity of the Study Areas is shown on Figure

27 The northwestern portion of Core 3, west of the Subject Lands now is included in the Conservation Area. The Conservation Area also includes Core 2 and the provincially owned lands in North Oakville West. Thus, the majority of the lands north and west of the FSS Study Area within the EIR SM1117a/SM1117 and 16MC Subcatchments are contained within the Glenorchy Conservation Area or in portions of Core 3 not included within the Conservation Area. As a result, there will be no development activities or substantive land use changes within the majority of the EIR Subcatchment Area; although it is anticipated that additional naturalization will occur over time. 2.3 Permitted Uses in the Natural Heritage System OPA 272 policy identifies potential permitted uses in the NHS. This policy addresses permitted uses including development, land disturbance, roads and related utilities, expansion of existing water and wastewater services, trails and passive recreational uses, stormwater management facilities, grading, private driveways and the adaptive use of institutional buildings. Table summarizes policy direction on permitted uses and notes report sections in this EIR/FSS that address these permitted uses. Section of NOCSS also lists permitted uses in Cores, Linkages and High and Medium Constraints Stream Corridors. These include: Development or land disturbances required for flood and stream bank erosion control and protection of fish, wildlife and conservation management; Infrastructure/utility access and crossings; Public pedestrian trails; and, SWM facilities. These uses are subject to studies such as this EIR/FSS to address the placement of facilities/uses to ensure that they are compatible with core area management set out in Section of NOCSS. Management recommendations for Core 3 are listed in Section 3.0. Sections of NOCSS also address permitted uses in the NHS. With respect to this EIR/FSS, reference was made to direction provided on road crossings of the NHS and trails in the NHS in Section of the NOCSS. Direction provided in Section on permissible grading in the NHS was also referenced and provided guidance to the preparation of a preliminary grading plan for the Subject Lands. 2-14

28 Table Summary of Policy Direction on NHS Permitted Uses OPA 272 Policy Number Potential Permitted Use Policy Direction Addressed in EIR/FSS Report Sections c) i) Development or land disturbance Permitted in accordance with the directions of the North Oakville Creeks Subwatershed Study and any related Environmental Implementation Report, and Federal, Provincial and Conservation Authority regulations for required flood and stream bank erosion control; for fish, wildlife and conservation management; to accommodate a stormwater outfall; or in Medium Constraint Stream Corridor Areas. Section c) ii) Roads and related utilities Permitted only to cross the designation in the general area of the road designations shown on Figures NOE2 and NOE4 or as defined through an Environmental Assessment; and, be designed to minimize grading in accordance with the directions established in the North Oakville Creek Subwatershed Study. Road design criteria are identified in policies Section c) iii) Expansion to existing Water and Wastewater services c) iv) Trails, interpretative displays or signage or other similar passive recreation uses c) v) Stormwater management facilities Expansion permitted to existing Water and Wastewater services which are located on sites with existing facilities subject to any required Environmental Assessment. Permitted if consistent with the purpose of the applicable designation and criteria listed in policy Permitted subject to directions of NOCSS, conformance with technical performance specifications listed in policy and as shown conceptually on Figure NOE3 (OPA 272). Not applicable to this EIR/FSS Section 6.2 Not applicable to this EIR/FSS 2-9

29 OPA 272 Policy Number Potential Permitted Use Policy Direction Addressed in EIR/FSS Report Sections c) vi) Grading in the Natural Heritage component of the Natural Heritage and Open Space System Permitted in accordance with the directions established in the North Oakville Creeks Subwatershed Study or appropriate Environmental Assessment. Section c) vii) Private Driveways Not applicable to this EIR/FSS Not applicable to this EIR/FSS c) viii) Adaptive re-use of heritage buildings for institutional uses Not applicable to this EIR/FSS Not applicable to this EIR/FSS 2-10

30 3.0 CORE Approach to Core Delineation As noted in Section 2.0, OPA 272 and NOCSS include a Core Preserve Area in the northern portions of the EIR Subcatchment Areas. Referred to as Core 3, this Core Preserve Area encompasses the natural communities associated with Sixteen Mile Creek between Dundas Street and Hwy 407 to the north. The EIR/FSS TOR require that the limits of Core 3 be delineated based on field surveys of natural heritage features. The part of the Core 3 boundary that is contiguous with the Subject Lands has been delineated based on determining the limits of natural heritage features of this Core and applying appropriate buffers. This process included: a) pre-staking of the limits of environmental features in May and October 2008; b) preparation of a submission to the Town and CH on the Core 3 boundary delineation, dated October 19, 2010, identifying all pre-staked areas, documenting the approach to boundary delineation and presenting a drawing illustrating Core 3 feature limits and its recommended boundary, north and east of the Subject Lands; c) site visit, October 26, 2010, with the Town and CH s representatives to view/modify/approve pre-staking; d) receipt of letter from CH, December 9, 2010, providing comments regarding the long term stable slope assessment (LTSS); e) preparation of a submission on Core 3 boundary delineation, dated February 23, 2011, identifying final staked locations; f) attendance at a meeting at CH, March 1, 2011, to discuss Core boundary with Town and CH representatives; g) receipt of March 4, 2011 and April 5, s from CH regarding acceptance of top of bank staking and comments on the LTSS; h) staking of wetland on ORC lands west of Graydon Banning, April 19, 2011; 3-1

31 i) preparation and submission of a slope stability analysis on the Sixteen Mile Creek valley by AME Materials Engineering, June 2012; j) receipt of letter from CH, November 2, 2012, providing comments regarding the long term stable slope assessment (LTSS); k) revisions to and resubmission of LTSS by AME, dated January 2013, submitted December 22, 2014; l) receipt of letter from CH, July 20, 2015, with comments on LTSS and floodline along stream reach 16WA-1; and, m).response letters from Stantec Consulting (October ) and AME (October 30, 2015) addressing CH comments from July 20, Appendix B contains documentation (items l and m above) and the most current Core boundary drawing, Core 3 NHS-1. Only one small change to the limit of development resulted from the recent response letters along stream reach 16WA-1, as outlined in the Stantec Consulting letter dated October 30, Core 3 Boundary Drawing Core 3 NHS-1 presents the Core 3 boundary west of Sixteen Mile Creek and east of Glenorchy Conservation Area. A Reference Plan will be prepared and submitted to the Town in the future. The boundary, as presented, was determined by applying the following buffers to the limits of staked features: 10m from dripline of trees for the woodland areas; 15m from stable top-of-bank; and, 0m from thickets, hedgerows and cultural meadows. The limits of Core 3 on the Graydon Banning lands are considered final. The Core boundary on the CHWO Radio Limited property, east of the Subject Lands has been estimated from the air photo coverage and existing topographic mapping, applying the most conservative offset of 10m to the interpreted dripline and 15m to the top-of-bank locations. This property is a non-participating Owner in the EIR/FSS and therefore staking/surveying of that Core limit will be necessary when this Owner prepares an EIR/FSS in the future. 3-2

32 Core 3 limits on the Shevchenko lands have been estimated from air photo interpretation. Finalization of the Core 3 on this property is dependent upon one yet unstaked location of the boundary on the CHWO Radio Lands and therefore may require confirmation based on a field visit with the agencies. 3.3 Characterization of Core 3 within the EIR Study Area Core 3, which encompasses the main valley of Sixteen Mile Creek, also comprises a portion of 16 Mile Creek Provincially Significant Life Sciences ANSI. It includes tableland and valley bottomland woodlands and riparian wetlands, and within the limits of the Core boundary meadow and agricultural lands the over the long term will succeed to more natural habitats. As well, there are manicured areas, including Lions Valley Park. Because of its size, it is the only Core that provides interior forest habitat greater than 300m from a woodland edge. The natural area associated with Core 3 is expanded greatly, by the connectivity to the north, under Hwy 407, to upstream areas of Sixteen Mile Creek and portions of the Glenorchy Conservation Area; to the south under Dundas Street along the Sixteen Mile Creek valley; to the east to Core 5 via the former landfill on the east side of the valley well northeast of the Subject Lands; and, to the west into other portions of the Glenorchy Conservation Area which includes Core 2. The Core 3 covers approximately 245ha. All of this area lies within subcatchments of Sixteen Mile Creek and tributaries to Sixteen Mile Creek. The two Sixteen Mile Creek subcatchments that comprise the EIR Subcatchment Area, SM1117a and Sixteen Mile Creek (west side of main creek), terminate at Hwy 407 as there is no drainage connectivity to the north. The areas of these subcatchments within Core 3 are noted below in Table The areas identified for the west side of Sixteen Mile Creek in Table define the core areas with the EIR Subcatchment Areas. 3-3

33 Table Subcatchment Area Core 3 Areas by Subcatchment Area of Core 3 (ha) West side Sixteen Mile Creek SM1117a Mile Creek 86.3 East side Sixteen Mile Creek ES ES4-east 12.9 ES4-west 41.2 ES ES9 0.1 Total: The distribution of the habitat types of the west portion of Core 3 (i.e., west of Main Sixteen Mile Creek) within the EIR Subcatchment Areas, is presented in Table 3.2. Table West Portion Core 3 Habitat Types (Core 3 within EIR Subcatchment Areas) General Habitat Type Forest (woodlands) Habitat Types (ELC Community Codes) FOD deciduous forest FOC coniferous forest Representation in West Portion of Core 3 (%) Cultural thickets CUT thicket 5 Wetlands Shallow Marsh/Riparian/open water Agriculture (cropped) Landscaped Mainly Park 6 TOTAL

34 3.4 NOCSS Core 3 Management Recommendations NOCSS identified a management strategy to, protect and enhance the natural environmental in a sustainable fashion. With respect to Core 3, Section lists the management recommendations to be: The existing woodlands and wetlands are recommended for retention. Forested linkages to Core #4 and #5 are recommended. These recommendations were respected during the preparation of this EIR/FSS. The woodlands and wetlands within Core 3 will not be modified or impacted by the proposed development and connectivity to Cores 4 and 5 are not affected by development of the Subject Lands. 3-5

35

36 4.0 GEOLOGY AND HYDROGEOLOGY 4.1 Scope of Work The scope of work completed for the hydrogeological component of this EIR was designed to address the technical requirements as set out in the EIR Terms of Reference for North Oakville (2013). Specifically the hydrogeological work program was completed to: Review the regional hydrogeological setting; Characterize the local soil, groundwater, and surface water flow conditions; Assess the local groundwater/surface water interactions and identify areas for recharge/discharge function protection; Characterize the existing surface water and groundwater quality; Calculate the pre- and post-development water balance conditions; Identify hydrogeological opportunities and constraints to maintaining the water balance; Identify the type, location and size of infiltration or storage measures that may be feasible for use based on the geological and hydrogeological conditions; Evaluate opportunities for augmenting groundwater infiltration through appropriate and practical best management practices to balance, or at least in part, make up the postdevelopment infiltration deficit; and Identify potential construction constraints related to the hydrogeological conditions. The detailed scope of work included: 1. Review of Ministry of the Environment and Climate Change (MOECC) water supply well records and available geotechnical reports for the Subject Lands to assess the regional hydrogeological setting and soil conditions. A listing of the local MOECC water supply well records is provided in Appendix C-1 and the locations of these wells, as recorded in the MOE records, are shown on Figure The installation of boreholes and groundwater monitoring wells across the Subject Lands to investigate the site-specific soil and groundwater conditions. The borehole and monitoring well locations are shown on Figure 4.1 and copies of the soil logs and 4-1