Prepared for: City of Toronto Metro Hall 20th Floor, 55 John Street, Toronto, ON, M5V 3C6 Attention: Grace Tesa Lawrence Park Neighbourhood Investigation of Basement Flooding & Road Improvement Environmental Assessment Final Report submitted by: Aquafor Beech Ltd. January 31st, 2018 Contact: Dave Maunder, P.Eng Aquafor Beech Limited [email protected] 2600 Skymark Avenue Building 6, Unit 202 Mississauga, ON L4W 5B2 T. 905.629.0099 ext.290 F. 905.629.0089 Aquafor Beech Reference: 65319 City of Toronto January 31, 2018 Lawrence Park Neighbourhood Investigation of Basement Flooding & Road Improvement Study Table of Contents TABLE OF CONTENTS ....................................................................................................................... I LIST OF TABLES .............................................................................................................................. III LIST OF FIGURES ............................................................................................................................ III LIST OF APPENDICES ...................................................................................................................... VI 1.0 INTRODUCTION .............................................................................................................. 1 1.1 BACKGROUND ................................................................................................................ 1 1.2 STUDY AREA CHARACTERISTICS ..................................................................................... 3 1.3 STUDY PURPOSE AND PRIMARY TASKS .......................................................................... 5 2.0 PROBLEM AND OPPORTUNITY IDENTIFICATION ............................................................ 6 2.1 GENERAL ......................................................................................................................... 6 2.2 IDENTIFICATION OF PROBLEMS AND OPPORTUNITIES .................................................. 6 3.0 THE ENVIRONMENTAL ASSESSMENT PROCESS ............................................................ 10 3.1 THE ENVIRONMENTAL ASSESSMENT ........................................................................... 10 3.2 PUBLIC CONSULTATION................................................................................................ 13 3.3 PETITIONS ..................................................................................................................... 19 3.4 MEETINGS ..................................................................................................................... 19 3.5 NOTIFICATION AND CONSULTATION WITH AFFECTED PROPERTY OWNER ................ 20 3.6 AGENCY AND INDIGENOUS CONSULTATION ............................................................... 20 3.7 REPORT TO COUNCIL .................................................................................................... 21 3.8 NOTICE OF COMPLETION ............................................................................................. 23 4.0 EXISTING CONDITIONS ................................................................................................. 24 4.1 STUDY AREA.................................................................................................................. 24 4.2 NATURAL ENVIRONMENT ............................................................................................ 24 4.3 SOCIO – ECONOMIC ENVIRONMENT ........................................................................... 34 4.4 PROPOSED LAND USE ................................................................................................... 35 4.5 TRANSPORTATION ........................................................................................................ 36 5.0 EXISTING DRAINAGE AND ROADS NETWORKS............................................................. 37 5.1 GENERAL ....................................................................................................................... 37 Aquafor Beech Limited 65319 i City of Toronto January 31, 2018 Lawrence Park Neighbourhood Investigation of Basement Flooding & Road Improvement Study 5.2 EXISTING STORM DRAINAGE, COMBINED AND SANITARY SYSTEMS ........................... 40 5.3 SURFACE AND BASEMENT FLOODING.......................................................................... 40 5.4 ROAD STRUCTURE ........................................................................................................ 45 5.5 SOILS INVESTIGATION .................................................................................................. 48 5.6 TRANSPORTATION ........................................................................................................ 52 6.0 ASSESSMENT OF EXISTING CONDITIONS – SEWER SYSTEMS ...................................... 68 6.1 GENERAL ....................................................................................................................... 68 6.2 SANITARY SEWER SYSTEM ............................................................................................ 68 6.3 DUAL STORM DRAINAGE SYSTEM ................................................................................ 78 6.4 COMBINED SEWER SYSTEM ......................................................................................... 95 7.0 DEVELOPMENT AND ASSESSMENT OF ALTERNATIVE REMEDIAL MEASURES – BASEMENT FLOODING ............................................................................................... 102 7.1 GENERAL ..................................................................................................................... 102 7.2 LEVEL OF SERVICE CRITERIA ....................................................................................... 102 7.3 DEVELOPMENT AND ANALYSIS OF ALTERNATIVES .................................................... 103 7.4 SIZING OF ALTERNATIVES ........................................................................................... 114 7.5 EVALUATION CRITERIA ............................................................................................... 126 7.6 EVALUATION OF ALTERNATIVES ................................................................................ 126 7.7 CONCLUSION .............................................................................................................. 134 8.0 DEVELOPMENT AND ASSESSMENT OF ALTERNATIVE REMEDIAL MEASURES –ROADS, DRAINAGE AND PEDSTRIAN SAFETY .......................................................................... 135 8.1 GENERAL ..................................................................................................................... 135 8.2 DEVELOPMENT AND ASSESSMENT OF ALTERNATIVES .............................................. 135 8.3 EVALUATION CRITERIA ............................................................................................... 139 8.4 EVALUATION OF ALTERNATIVES ................................................................................ 144 8.5 CONCLUSIONS ............................................................................................................ 149 9.0 DEVELOPMENT AND ASSESSMENT OF ALTERNATIVE REMEDIAL MEASURES –TRAFFIC 153 9.1 GENERAL ..................................................................................................................... 153 9.2 SIGHTLINES ................................................................................................................. 153 Aquafor Beech Limited 65319 ii City of Toronto January 31, 2018 Lawrence Park Neighbourhood Investigation of Basement Flooding & Road Improvement Study 9.3 TRAFFIC INFILTRATION ............................................................................................... 154 9.4 PEDESTRIAN LINKAGE NETWORK ............................................................................... 155 10.0 DESCRIPTION OF THE PREFERRED SOLUTION ............................................................ 162 10.1 GENERAL ..................................................................................................................... 162 10.2 SEWER SYSTEM PROJECTS .......................................................................................... 162 10.3 ROADS, DRAINAGE AND PEDESTRIAN SAFETY PROJECTS .......................................... 178 10.4 TRAFFIC AND PEDESTRIAN SAFETY............................................................................. 226 List of Tables Table 4.2.1 – Breakdown of preservation priority rankings by criteria ..................................... 30 Table 4.3.1 – Land Use Classification ........................................................................................... 35 Table 5.3.1 – Summary of Flooding Types, Potential Primary Causes and Potential Remedial Measures ...................................................................................................................................... 45 Table 5.5.1 – Estimated Soil Permeability at Sixteen Locations ................................................. 50 Table 5.5.2 – Soils Type and Coefficient of Permeability ........................................................... 51 Table 5.6.1– Intersection Performance Summary ...................................................................... 55 Table 5.6.2 - Road Classification Criteria (2008 Road Classification System of City of Toronto) 58 Table 7.3.1– Evaluation of Remedial Measures ........................................................................ 106 Table