South Tunnels and Sheppard West Station Environmental ... - TTC
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South Tunnels and Sheppard West Station Environmental ... - TTC
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Toronto-York Spadina Subway Extension ProjectSubway <strong>Station</strong> Design ServicesContract No. A85-75F <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong><strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong><strong>Environmental</strong> Management PlanMay 28, 2010Toronto Transit Commission
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanList of AbbreviationsAST – Aboveground Storage TankCALA – Canadian Association for Laboratory AccreditationCAA – Conservation Authorities ActCEAA – Canadian <strong>Environmental</strong> Assessment ActCEPA – Canadian <strong>Environmental</strong> Protection ActCESR – Classification <strong>and</strong> Exemption of Spills Regulation (O.Reg. 675/98)CSA – Canadian St<strong>and</strong>ards AssociationDEPTHS – Double Ended Pocket Track Housing StructureDFO – Fisheries <strong>and</strong> Oceans CanadaEAA – <strong>Environmental</strong> Assessment Act (Provincial)EATP – <strong>Environmental</strong> Awareness Training ProgramEEB – Emergency Exit BuildingEMP – <strong>Environmental</strong> Management PlanEPA – <strong>Environmental</strong> Protection Act (Ontario)EPBM – Earth pressure balance tunnel boring machineESA – <strong>Environmental</strong> Site AssessmentESC – Erosion <strong>and</strong> Sediment ControlETR – Express Toll RouteFRP – Fibre-reinforced polymerGGHACA – Greater Golden Horseshoe Area Conservation AuthoritiesGTA – Greater Toronto AreaHASP – Health <strong>and</strong> Safety PlanHDPE – High Density PolyethyleneMOE – Ministry of the EnvironmentMSDS – Material Safety Data Sheet(s)OHSA – Ontario Health <strong>and</strong> Safety ActO. Reg. – Ontario RegulationOWRA – Ontario Water Resources ActPID – Photoionization DetectorPPE – Personal Protective EquipmentPPUDO – Passenger Pick Up <strong>and</strong> Drop OffPTTW – Permit to Take WaterPWQO – Provincial Water Quality ObjectivesSAC – Spills Action CentreSEM – Sequential Excavation MethodSOE – Support of ExcavationSPGP – Sleeve Port Grout PipeSRK – Spill Response KitSWM – Surface water managementTBM – Tunnel Boring MachineTCLP – Toxicity Characteristic Leaching ProcedureTDGA – Transportation of Dangerous Goods ActTKN – Kjeldahl NitrogenTMP – Traffic Management PlanTPZ – Tree Protection ZoneTRCA – Toronto <strong>and</strong> Region Conservation AuthorityTSSA – Technical St<strong>and</strong>ards <strong>and</strong> Safety Act<strong>TTC</strong> – Toronto Transit CommissionTYSSE – Toronto-York Spadina Subway ExtensionVCC – Vaughan Corporate CentreVL – Volume LossWHMIS – Workplace Hazardous Materials Information SystemWRWP – Waste Reduction Work PlanYRT – York Region TransitZOI – Zone of InfluenceDBH – diameter at breast heightmbgs – metres below ground surfacem 2 – metres squaredPage 2
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan1. INTRODUCTIONThe Toronto Transit Commission (<strong>TTC</strong>) has elected to undertake the completion of the Toronto-YorkSpadina Subway Extension (TYSSE) Project, which involves the extension of the Spadina Subway linefrom its existing terminus at Downsview <strong>Station</strong> in Toronto, Ontario to the Vaughan Corporate Centre inthe City of Vaughan, Ontario. A total of six new stations will be constructed <strong>and</strong> associated tunnellingwill be completed as part of the Subway Extension Project, including: <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, Finch<strong>West</strong> <strong>Station</strong>, York University <strong>Station</strong>, Steeles <strong>West</strong> <strong>Station</strong>, Highway 407 <strong>Station</strong>, <strong>and</strong> the VaughanCorporate Centre <strong>Station</strong> (VCC). The goal of this effort is to improve the efficiency of publictransportation in the Greater Toronto Area (GTA) <strong>and</strong> improve intermodal connections for passengerswho use public transportation.This <strong>Environmental</strong> Management Plan (EMP) has been developed to protect the environment duringactivities associated with the construction of the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>and</strong> the <strong>South</strong> <strong>Tunnels</strong> contract,which includes: the station box construction at the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, tunnelling works fromDownsview <strong>Station</strong> to Finch <strong>West</strong> <strong>Station</strong>, <strong>and</strong> development <strong>and</strong> implementation of l<strong>and</strong>scaping designplans. The <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> is located west of Dufferin Street <strong>and</strong> east of Keele Street in the Cityof Toronto, Ontario. Three additional EMPs for other elements of the TYSSE Project will be providedunder separate cover:1. North <strong>Tunnels</strong> <strong>and</strong> Highway 407 <strong>Station</strong> EMP2. York University Woodlot EMP (Finch <strong>West</strong> <strong>Station</strong>, York University <strong>Station</strong> <strong>and</strong> Steeles <strong>West</strong><strong>Station</strong>)3. Vaughan Corporate Centre <strong>Station</strong> EMPThe goal of the EMP is to communicate the environmental efforts that will be required from all Projectparticipants <strong>and</strong> stakeholders during the <strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> Contract to manage<strong>and</strong> minimize potential environmental impacts. As the proponent, the <strong>TTC</strong> is required to complete anEMP, as indicated in the <strong>Environmental</strong> Assessment Compliance Monitoring Program report, datedDecember 2008.1.1 OBJECTIVESThe overall objective of the EMP is to provide a comprehensive strategy for ensuring compliance withthe relevant environmental legislation, policies <strong>and</strong> permitting requirements, to provide project-wideenvironmental guidelines, <strong>and</strong> to ensure that the environment is protected throughout the life of theProject.The specific objectives of the EMP are to:Clearly state the environmental philosophy to be followed on the Project <strong>and</strong> provide direction toaction to avoid delay in identifying <strong>and</strong> addressing ecological impacts.Set the appropriate environmental objectives <strong>and</strong> framework <strong>and</strong> identify the relevant legislative,regulatory <strong>and</strong> approval requirements.Identify applicable mitigation measures <strong>and</strong> follow-up requirements during the Project.Establish contingency <strong>and</strong> response procedures related to the discovery of unexpected siteconditions.Establish clear roles <strong>and</strong> responsibilities for the Commission‟s Representative (<strong>TTC</strong>) <strong>and</strong>Contractor(s), including work accountability <strong>and</strong> institution of reporting protocols with respect toenvironmental issues.Require the implementation of environmental awareness training to ensure that all on-sitepersonnel underst<strong>and</strong> the importance of environmental protection, the causes of environmentaldamage, proper environmental protection practices <strong>and</strong> their obligations to ensure that theenvironment is protected.Establish an adaptive monitoring <strong>and</strong> management program to verify that the environmentalprotection measures outlined in the EMP <strong>and</strong> associated documents are being properlyimplemented <strong>and</strong> maintained <strong>and</strong> are effective.Ensure that proper records are maintained to monitor the effectiveness of the EMP.Establish a process for analyzing the results of inspection <strong>and</strong> monitoring <strong>and</strong> reviewing theresults with management in a timely manner to ensure rapid response to issues.Ensure safe, rapid <strong>and</strong> effective response to unexpected emergency situations.This EMP applies to active construction activities (i.e. mobilization, construction <strong>and</strong> demobilization) <strong>and</strong>the post-construction recovery period. The post-construction recovery period is the time immediatelyfollowing the completion of construction activities in which site conditions will be monitored untilconditions have stabilized (i.e. returned to pre-construction levels or anticipated post-constructionconditions).This EMP does not provide long term monitoring requirements for the period following the postconstructionrecovery period. Long term monitoring plans shall be developed under separate cover <strong>and</strong>are not the current responsibility of the <strong>South</strong> Tunnel <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> Contractor.If permits issued to the Contractor to complete construction works entail long-term monitoringcommitments, the Contractor may be required to complete long-term monitoring in accordance with saidpermit(s). This would involve a revision in the Contractor‟s scope <strong>and</strong> would require amendments to thisEMP or the development of an EMP under separate cover. If the permit is transferable, the <strong>TTC</strong> mayenter into an agreement with the Contractor to transfer the permit for long-term monitoring once activeconstruction activities are complete.1.2 PROJECT OVERVIEW – SHEPPARD WEST STATIONThe scope of work for the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> is outlined in detail in the design specifications. Thefollowing overview is provided:1. Design <strong>and</strong> construction of excavation shoring for the station box structure, including theconstruction of temporary structures at the north <strong>and</strong> south end of the excavation to enable theinsertion of <strong>and</strong> operation of Tunnel Boring Machines (TBM);2. Selection, design <strong>and</strong> maintenance of a dewatering system to reduce groundwater pressure <strong>and</strong>lower groundwater levels for a stable, undisturbed <strong>and</strong> substantially dry sub-grade;3. Management of soil stockpile areas <strong>and</strong> disposal;4. Construction of the <strong>TTC</strong> subway station <strong>and</strong> YRT/GO Terminals; <strong>and</strong>,5. Acquisition of all necessary permits <strong>and</strong> documentation <strong>and</strong> the provision of all required services<strong>and</strong> instrumentation.Page 3
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan1.3 PROJECT OVERVIEW – SOUTH TUNNELS CONTRACTThe scope of work for the <strong>South</strong> <strong>Tunnels</strong> contract is outlined in detail in the design specifications. Thefollowing overview is provided:1. The advancement tunnelling by TBM between <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>and</strong> Downsview <strong>Station</strong> tothe south <strong>and</strong> to Finch <strong>West</strong> <strong>Station</strong> to the north with associated construction of precast tunnelliner, launch shafts, extraction shafts, emergency exit buildings <strong>and</strong> cross-passages;2. TBM maintenance, settlement monitoring, <strong>and</strong> selection of conditioning agents <strong>and</strong> tunnelgrouting as per contract documents <strong>and</strong> design specifications;3. Selection, design <strong>and</strong> maintenance of a dewatering system to reduce groundwater pressure <strong>and</strong>lower groundwater levels for a stable, undisturbed <strong>and</strong> substantially dry sub-grade (in emergencyexit buildings <strong>and</strong> cross-passages, as required);4. Management of spoil materials including drying <strong>and</strong>/or mixing areas; <strong>and</strong>,5. Acquisition of all necessary permits <strong>and</strong> documentation <strong>and</strong> the provision of all required services<strong>and</strong> instrumentation.1.4 EXISTING ENVIRONMENTAL CONDITIONSExisting conditions of the natural environment within <strong>and</strong> adjacent to TYSSE construction areas <strong>and</strong>areas located within dewatering ZOI‟s were assessed to document baseline conditions as well as toidentify the presence/absence of significant or sensitive environmental receptors The results of theseassessments would identify key ecological receptors that would require monitoring during projectactivities. The following table summarizes the key ecological receptors associated with this project.Table 1-1 – Summary of Sensitive Ecological ReceptorsAdjacent toConstructionFootprintWithinZOIReceiver ofGroundwaterDischargeDetailsWetl<strong>and</strong>s NI NI NA -Woodl<strong>and</strong>s NI NI NA -Aquatic Habitat NI NI*Dufferin Creek, Black CreekWildlife Habitat NI NI NA -Endangered <strong>and</strong>-ThreatenedSpecies Habitat NI NINAANSI’s or ESA’s NI NI NA -*If groundwater is discharged to the municipal storm sewer<strong>Station</strong> BoxTunnel AlignmentNA – Not ApplicableNI – None IdentifiedThe <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> site, which includes Launch Shafts LS-4 <strong>and</strong> LS-5, as well as CrossPassage 2 (CP-2), is described as on old field meadow mixed with small amounts of woody growth.More specifically, the site consists of four vegetation communities, including dry-fresh mixed meadow,cattail graminoid mineral meadow marsh, dry-fresh deciduous shrub thicket <strong>and</strong> dry-fresh deciduouswoodl<strong>and</strong>.The Cross Passage 3 (CP-3) site is within an old field meadow with pockets of meadow marsh <strong>and</strong>scattered woody shrubs <strong>and</strong> trees. The majority of the area is a dry-moist Old Field Meadow (CUM1-1)with small areas of Reed Canary Grass Mineral Meadow Marsh <strong>and</strong> scattered, immature, naturallyregenerating trees.No provincially or locally significant wetl<strong>and</strong>s, areas of natural or scientific interest (ANSI‟s),environmentally sensitive areas (ESA‟s) or aquatic habitat were located within or adjacent to the <strong>Station</strong>site, the CP-3 site as well as within the ZOI‟s of these sites. In addition, no rare or sensitive specieshabitat or significant wildlife habitat were identified. The value of habitat connectivity is limited as thereare no associated habitat features connected to these sites. Adjacent l<strong>and</strong>s to the sites <strong>and</strong> l<strong>and</strong>s withinthe sites‟ ZOI‟s are comprised of similar habitat described above as well as urban development. Insummary, no ecological receptors were identified adjacent to the <strong>Station</strong> or CP-3 sites, nor within theZOI‟s.All of the remaining TYSSE construction areas, (extraction shafts ES-4 <strong>and</strong> ES-5, emergency exitbuildings EEB-1, EEB-2 <strong>and</strong> EEB-3 <strong>and</strong> cross-passages CP-1 <strong>and</strong> CP-4) <strong>and</strong> areas located withindewatering ZOI‟s have been assessed for any significant or sensitive ecological receptors. The areasare all built-up residential or commercial areas with maintained lawn with planted <strong>and</strong> maintained streettrees.If the municipal storm sewer system is selected as the location for groundwater discharge, the water willultimately flow into nearby watercourses, including Black Creek <strong>and</strong> Dufferin Creek, further identifyingthese features as ecological receptors. These watercourses are both highly urbanized systems thatexperience flash short term high flows from storm water runoff. As storm water is the main source offlow in these systems, the Creeks are considered to have degraded water quality. They are alsoclassified as warm water fish habitat where only tolerant species are present.Dufferin Creek‟s stream flow originates from a stormwater sewer outfall located approximately 1kmupstream of the <strong>West</strong> Don River. A fish barrier is present at the Dufferin Street crossing (approx. 0.5kmupstream of <strong>West</strong> Don River) with the presence of a large double box culvert that is perchedapproximately 2m on the downstream side. Downstream of this barrier is the G. Ross Lord dam.Periodically, during high flow periods as such experienced after a large rain event, the dam will createback flow <strong>and</strong> pooling, resulting in the formation of the G. Ross Lord reservoir. It is also likely that backflow also raises water levels in Dufferin Creek as stream gradient is very low in this area. The presenceof the 2m barrier at Dufferin Street is also likely present to prevent the back flow from moving beyondthis point. It is expected that fish are not present within the reach from this fish barrier at Dufferin Streetupstream to the stormwater outfall. Downstream of the fish barrier, fish are able to migrate from the<strong>West</strong> Don River <strong>and</strong> the G. Ross Lord reservoir. TCRA fish collection records for the area immediatelydownstream of Dufferin Street confirm the presence of a single species, Blacknose Dace (Rhinichthysatratulus). Fish community data present for the <strong>West</strong> Don in a reach located upstream of the DufferinCreek confluence include Brown Bullhead (Ameiurus nebulosus), Common Carp (Cyprinus carpio),Pumpkin Seed (Lepomis gibbous), Rock Bass (Ambloplites rupestris) <strong>and</strong> White Sucker (Catostomuscommersonii). All are generally tolerant species <strong>and</strong> are expected to migrate into Dufferin Creek duringperiods of sufficient flow.Black Creek is part of the larger Humber River watershed <strong>and</strong> is managed for darter species under theHumber River Fisheries Management Plan (HRFMP, 2004). The fish community of Black Creek istypical of a warm water system. Dominant species include White Sucker (Catostomus commersonii),Page 4
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan<strong>and</strong> Creek Chub (Semotilus atromaculatus). Less abundant species include Blacknose Dace(Rhinichthys atratulus), Pumpkinseed (Lepomis gibbous), <strong>and</strong> Bluegill (Lepomis macrochirus).The following table summarizes the ecological receptors associated with this project.1.5 APPLICABLE LEGISLATION AND GUIDING PRINCIPLESIn order to undertake environmental protection measures effectively <strong>and</strong> competently, Contractor(s)must be knowledgeable of the environmental legislation <strong>and</strong> legal requirements that are applicable tothe Project scope. The following Federal, Provincial <strong>and</strong> municipal regulations, by-laws <strong>and</strong> guidelinesdirect the policies in this EMP <strong>and</strong> must be adhered to throughout the implementation of the Projectundertaking. Best management principles must also be considered, although they are not legallybinding.1.5.1 FederalThe federal legislation that applies to this work includes, but not limited to, the following:LegislationCanadian <strong>Environmental</strong> Assessment Act(CEAA), S.C. 1992, c. 37, ConsolidatedStatutes of CanadaDangerous Goods Transportation Act (TDG)Canadian <strong>Environmental</strong> Protection Act(CEPA)Federal Fisheries Act, Fisheries <strong>and</strong> OceansCanada (DFO)Migratory Birds Convention Act*Regulations/St<strong>and</strong>ards/GuidelinesAnd associated regulations.And associated regulations.And associated regulations.Section 36, Subsection 3Section 37, Subsection 1And associated regulations.Migratory Birds Regulations* Bird migration plans will be completed under separate cover, as requiredPursuant to Section 35 of the Fisheries Act, the Toronto <strong>and</strong> Region Conservation Authority (TRCA) hasa Level 3 agreement with the Department of Fisheries <strong>and</strong> Oceans (DFO) which grants them theauthority to review proposed work plans on behalf of DFO, to determine the potential for harmfulalterations, disruptions or destructions of fish habitat (HADD) within their jurisdiction. Through a reviewof this EMP, the TRCA shall determine whether the proposed mitigation <strong>and</strong> monitoring measuresrelated to the protection of fish <strong>and</strong> fish habitats are appropriate given the project works <strong>and</strong> issue aLetter of Advice with respect to their findings. The Letter of Advice shall confirm that the EMP protocolsare appropriate <strong>and</strong> if employed as described, the project will not result in negative impacts to fish <strong>and</strong>fish habitat. Any additional mitigative measures will also be identified as required.1.5.2 ProvincialThe Provincial legislation that applies to this work includes, but not limited to, the following:Legislation/Department<strong>Environmental</strong> Assessment Act (EAA),R.S.O. 1990, c. E.18, Consolidated Statutesof Ontario<strong>Environmental</strong> Protection Act (EPA)Technical St<strong>and</strong>ards <strong>and</strong> Safety Act (TSSA)Regulations/St<strong>and</strong>ards/GuidelinesTransit Projects <strong>and</strong> Greater Toronto Transportation AuthorityUndertakings, O. Reg. 231/08Soil, Ground Water <strong>and</strong> Sediment St<strong>and</strong>ards for Use UnderPart XV.1 of the <strong>Environmental</strong> Protection Act, March 2004<strong>and</strong> amendments (O. Reg. 511/09)General - Waste Management, R.R.O. 1990, Reg. 347Waste Audits <strong>and</strong> Waste Reduction Work Plans, O. Reg.102/94Industrial, Commercial <strong>and</strong> Institutional Source SeparationPrograms, O. Reg. 103/94Classification <strong>and</strong> Exemption of Spills <strong>and</strong> Reporting ofDischarges, O. Reg. 675/98Records of Site Condition - Part XV.1 of the Act, O. Reg.153/04 <strong>and</strong> amendments.And associated regulations.Ontario Water Resources Act (OWRA) Wells, R.R.O. 1990, O. Reg. 903And associated regulations.Occupational Health <strong>and</strong> Safety Act (OHSA) Construction Projects, O. Reg. 213/91Water Management Policies, Guidelines ,Provincial Water Quality Objectives of theMinistry of Environment <strong>and</strong> Energy (MOEE)Ontario Ministry of Transportation1.5.3 Municipal Governments <strong>and</strong> Local AuthoritiesAnd associated regulations.Water Management Policies, Guidelines, Provincial WaterQuality Objectives of the Ministry of Environment <strong>and</strong> Energy,Table 2 – Table of PWQOs <strong>and</strong> Interim PWQOs, July, 1994Ministry of Transportation Ontario Drainage ManagementManual, 1997During the construction works, water discharges to the municipal sewer system must meet therequirements of the City of Toronto Municipal Code regarding Sewers (Chapter 681), as appropriate.The Contractor must obtain all necessary permits prior to construction works. Permits related to surfacewater discharges to storm sewer or a watercourse must also encompass contingency flows (i.e. stormflows etc.).Project works must comply with the Conservation Authorities Act (CAA) Section 28-Toronto RegionConservation Authority Ontario Regulation 166/06: Development, Interference with Wetl<strong>and</strong>s <strong>and</strong>Alterations to Shorelines <strong>and</strong> Watercourses Regulation. If a permit is issued by TRCA under this policy,Page 5
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan<strong>TTC</strong>The <strong>TTC</strong> is ultimately responsible for ensuring that environmental protection procedures are beingimplemented during the course of construction activities. If the <strong>TTC</strong> is notified by the Commission‟sRepresentative that environmental mitigation measures have not been implemented according to theEMP <strong>and</strong> legislative requirements, the <strong>TTC</strong> shall investigate the issue.Commission‟s RepresentativeThe Commission‟s Representative is responsible for collecting <strong>and</strong> reviewing all of the Contractor(s)<strong>Environmental</strong> Inspection Logs (EILs) <strong>and</strong> weekly summary reports (provided in Appendix B). In theevent that repairs or improvements are required to environmental controls, devices, procedures orsystems, as identified in the EIL, the Commission‟s Representative shall follow-up on theimplementation of mitigative measures <strong>and</strong> request an Incident Follow-up Summary (provided inAppendix C) from the Contractor if one is not provided within a week of the incident.c) Record the incident on an EIL <strong>and</strong> attach a description of the mitigation measures program thatwill be implemented in response to the incident. Submit the EIL <strong>and</strong> mitigative measures plan tothe Commission‟s Representative.d) Submit an Incident Follow-up Summary (Appendix C) report to the Commission‟sRepresentative, verifying that the proposed mitigation measures program was implementedsuccessfully <strong>and</strong> noting the condition of the indentified area of environmental concern. If theissue is not resolved in a reasonable period of time, as per the mitigation measures programdeveloped, the Commission‟s Representative shall contact take further action to ensuremitigation measures are implemented as required.The Contractor must ensure that brief daily discussions are to be held to address any shortfallsidentified during the implemented monitoring programs.If the review of documentation received by the Contractor(s) reveals that procedures as outlined in thisEMP have not been followed, the Commission‟s Representative shall investigate <strong>and</strong> determine thecause of non-compliance, shall convey to the Contractor that new mitigation measures are required.If confirmatory environmental audit monitoring or observations by the Commission‟s Representativeindicate potential concerns with respect to environmental controls implemented by the Contractor, theCommission‟s Representative will distribute the monitoring results to the Contractor immediately <strong>and</strong>ensure that the Contractor has employed the appropriate mitigative measures.Contractor(s), Contractor(s) <strong>and</strong> Sub-Contractor(s)Through their <strong>Environmental</strong> Monitor, the Contractor(s) is responsible for completing the appropriate onsitedocumentation to ensure compliance with environmental protection procedures. The Contractormust ensure that the <strong>Environmental</strong> Manager is completing their required duties as set out in this EMP.The Contractor(s) <strong>Environmental</strong> Manager shall:a) Record all observations <strong>and</strong> findings daily in an EIL (Appendix A) <strong>and</strong> report any immediateenvironmental concerns to the Contractor <strong>and</strong> Commission‟s Representative to ensure they areresolved.b) Clearly identify any required repairs or improvements on the EIL <strong>and</strong> provide an estimation of theurgency of the repair or improvement with respect to protecting the environmental condition ofthe receptor.c) Keep a copy of the EILs on site.d) Submit a copy of the daily EILs with a weekly summary report (Appendix B) to the Commission‟sRepresentative within 72 hours of the last working day of the week (i.e. if work week ended on aFriday, EILs <strong>and</strong> summary report must be submitted on Monday).If immediate environmental concerns with respect to construction activities or associated with siteactivities are identified, the Contractor‟s <strong>Environmental</strong> Manager shall:a) Report the incident to the Contractor <strong>and</strong> work with the Contractor to resolve the issue.b) Verify whether proper procedures had been followed prior to the incident. If it is discovered thatthe issue has occurred despite proper implementation, review the relevant procedures with theContractor, in consultation with the Commission‟s Representative, <strong>and</strong> amended mitigation orreporting measures to address the concern.Figure 1-1 – <strong>Environmental</strong> Monitoring Documentation <strong>and</strong> Reporting Protocol SummaryPage 7
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan1.6.2 <strong>Environmental</strong> Management TrainingAll personnel who are scheduled to perform work on-site must complete training sessions pertinent toenvironmental awareness (i.e. environmental orientation, hazard assessment <strong>and</strong> management, <strong>and</strong>PPE) that address the activities <strong>and</strong> hazards to which employees may be potentially exposed duringconstruction activities. The Contractor is responsible for administering an <strong>Environmental</strong> AwarenessTraining Program (EATP) to all on-site personnel <strong>and</strong> must ensure that sub-Contractors, hiredconsultants, <strong>and</strong> all other individuals on-site in Project work areas are trained <strong>and</strong> aware of theprocedures outlined in this EMP. The Contractor‟s EATP must fulfill the following three mainrequirements:1. Educate workers <strong>and</strong> visitors about the importance of environmental protection;2. Inform staff <strong>and</strong> visitors of their responsibilities regarding the environment <strong>and</strong> provide thenecessary educational tools to fulfil these responsibilities; <strong>and</strong>,3. Provide workers with a firm underst<strong>and</strong>ing of the environmental sensitivities associated with theundertaking <strong>and</strong> the role they play in protecting the environment.The EATP must include the following training components:Decontamination ProceduresSpill <strong>and</strong> Fire Response/Emergency <strong>and</strong> Response ProtocolsDiscovery of Unexpected Site Conditions (i.e. dewatering, soil contamination, etc.)Erosion <strong>and</strong> Sediment Control Measures AwarenessPersonal Protective Equipment (PPE)Fall Hazards (as appropriate)The Commission‟s Representative will review the Contractor‟s training program prior to commencementof construction activities. The Contractor(s) shall provide the Commission‟s Representative with alltraining records for all workers employed or sub-contracted by the Contractor.Any employees failing to follow or blatantly disregarding environmental procedures shall be removedfrom the construction site or be required to complete additional environmental awareness training,provided at the expense of the Contractor <strong>and</strong> reviewed by the Commission‟s Representative.1.6.3 Monitoring ResponsibilitiesThis section identifies the monitoring responsibilities of the parties outlined in Section 1.5 during theProject construction period. As information regarding terrestrial <strong>and</strong> groundwater systems has alreadybeen collected <strong>and</strong> discharge criteria will be such that no impacts to aquatic life are anticipated (seeSection 3), no additional pre-construction baseline monitoring to that which has already been completedis required for the purposes of evaluating construction impacts. Apart from items under warranty fromthe Contractor(s) as per contractual agreements with the <strong>TTC</strong> (i.e. plantings at station site), postconstructionrecovery monitoring, as defined in Section 1.1, will be the responsibility of theCommission‟s Representative for appropriate parameters <strong>and</strong> locations.The Commission‟s Representative may conduct periodic audits of the Contractor‟s environmentalcollection methods, data, <strong>and</strong> reporting to ensure that the Contractor‟s reporting accurately reflects theactual environmental condition of the Project. The frequency of environmental audits completed by theCommission‟s Representative is to be determined by the Commission‟s Representative.The Contractor shall develop, implement <strong>and</strong> maintain a quality control protocol throughout the projectto address the type, quantity <strong>and</strong> frequency of duplicate <strong>and</strong> confirmatory samples or inspections thatwill be completed.ParameterGroundwaterQuality <strong>and</strong>QuantitySurface waterrunoff ManagementGroundwater LevelGroundwater LevelTerrestrial HealthTable 1-2 - Monitoring Responsibilities during ConstructionLocationDischarge point fromwater treatment orgroundwater sumpto municipal sewer(storm or sanitary)At location ofdischarge tomunicipal stormsewerShafts <strong>and</strong> <strong>Station</strong>BoxWoodlots <strong>and</strong>Vernal PoolsWoodlots <strong>and</strong>Vernal PoolsRegularConstructionMonitoring 1Responsibility<strong>Environmental</strong>Audits 2RegulatoryComplianceMonitoring 2Contractor(s) EM NA RegulatorContractor(s) EM NA RegulatorContractor(s) EM NA NACommission‟sRepresentativeContractor‟s arborist <strong>and</strong>terretrial ecologistTerrestrial Health <strong>Station</strong> Site Contractor(s) EMSediment <strong>and</strong>Erosion ControlsThroughout ProjectsiteContractor(s) EMNACommission‟sRepresentativeCommission‟sRepresentativeCommission‟sRepresentative1 Minimum required monitoring frequencies provided in Section 4.2 Monitoring frequencies determined by responsible authority <strong>and</strong> are not m<strong>and</strong>ated in this EMP.1.6.4 Notification of Adaptive Measures ImplementationNARegulatorThe implementation of st<strong>and</strong>ard adaptive management protocols outlined in this EMP will not need to bereported, as they will not impact regulatory agencies. However, in the event that adaptive measures notoutlined in this EMP are employed, <strong>and</strong> if the adaptive measure will impact the relevant authority‟sincident response, confirmatory sampling, or permit approvals, the Commission‟s Representative shallnotify the appropriate authority forthwith. Relevant regulatory agencies may include:Toronto Regional Conservation Authority (TRCA)Ministry of the Environment (MOE)Regional Municipality of YorkCity of TorontoNANAPage 8
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan1.7 REFERENCE DOCUMENTSThe following documents are either referenced in this following EMP <strong>and</strong>/or are noted here to indicate that theyhave been or will be completed as part of the design of the Toronto-York Spadina Subway Extension inaccordance with the compliance mitigation measures specified by the <strong>Environmental</strong> Assessment ComplianceMonitoring Program.Terrestrial <strong>and</strong> EcologyMemor<strong>and</strong>um: Toronto York Spadina Subway Extension – Vegetation Communities Report(Beacon <strong>Environmental</strong>, October 2009)Arborist Reports:o Extraction Shaft 5 (ES-5), berm between Dufferin Street <strong>and</strong> Allen Road, just north of <strong>Sheppard</strong>Avenue;o Cross Passage 1 (CP-1), east side of Kodiak Cres, north of <strong>Sheppard</strong> Avenue;o Emergency Exit Building 1 (EEB-1), northwest corner of Kodiak Crescent <strong>and</strong> Whitehorse Road;o Emergency Exit Building 2 (EEB-2), north side of St. Regis Crescent, east of Keele Street; <strong>and</strong>o Emergency Exit Building 3 (EEB-3), intersection of Keele Street <strong>and</strong> Toro Road.Memor<strong>and</strong>um: Breeding Bird Surveys for TYSSE (Beacon <strong>Environmental</strong>, September 2009)Transportation Plan Supplemental Hydrological ReportNatural Heritage Impact Study - <strong>TTC</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> (AECOM, February 2010)Ecological Existing Conditions Report - <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, Toronto-York-Spadina SubwayExtension (AECOM, September 2009)Memor<strong>and</strong>um: Geomorphic Erosion Thresholds of Hoover Creek, Dufferin Creek <strong>and</strong> Black Creek(AECOM, May 2010)Memor<strong>and</strong>um: TYSSE <strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> EMP Thermal Assessment(AECOM, May 2010)TYSSE – <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> Baseline Noise <strong>and</strong> Vibration Report (AECOM, September2009)Settlement PredictionSettlement Prediction <strong>and</strong> Affected Structures Study – Bored <strong>Tunnels</strong> <strong>and</strong> Cut-<strong>and</strong>-CoverExcavation (Hatch Mott MacDonald, September 2009, HMM253141-3002-01-119-0005 Rev B))Settlement Prediction <strong>and</strong> Affected Utilities Study – Bored <strong>Tunnels</strong> <strong>and</strong> Cut-<strong>and</strong>-Cover Excavation(Hatch Mott MacDonald, October 2009, HMM253141-3002-01-119-0006 Rev A)ArchaeologyStage 2 Property Assessment: Toronto-York Spadina Subway Extension – Parc Downsview Park(Archaeological Services Inc., October 2009)Stage 2 Archaeological Assessment of: Proposed <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> (Archeoworks Inc,September 2009)Soil <strong>and</strong> Groundwater H<strong>and</strong>lingDisposal of Excavated Tunnel Soil (Hatch Mott MacDonald, November 2009, HMM253141-3002-01-119-0004 Rev B)Erosion <strong>and</strong> Sediment Control PlanSoil <strong>and</strong> Groundwater Strategy; <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, Toronto-York-Spadina Subway Extension(Golder, February 2010, 08-1111-0039 (2433) Ver. A)Geo-Engineering Design Draft Report (Golder, February 2010, 08-1111-0039 (4210) Ver. A)Calculated Dewatering Rates <strong>and</strong> Zones of Influence for Excavation Locations, TechnicalMemor<strong>and</strong>um, Toronto-York Spadina Subway Extension.(Golder Associates, Inc., June 8, 2010,08-1111-0039 (2440))Air QualityToronto-York-Spadina Subway Extension - Air Quality Assessment Report (AECOM, May 2010)Comprehensive <strong>Environmental</strong> Controls <strong>and</strong> Methods Plan for DustPage 9
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan2. CONSTRUCTION OVERVIEWThe construction of the <strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> is a multi-faceted Project,requiring the efforts of numerous Contractors, Sub-Contractors <strong>and</strong> other stakeholders for successfulcompletion. The construction elements discussed herein present potential challenges to maintaining theintegrity of the natural environment during <strong>and</strong> following construction works, therefore all potentialenvironmental impacts posed by the intrusive works must be mitigated. If alternative constructionmethods to those in the specifications are presented by the Contractor <strong>and</strong> reviewed by <strong>TTC</strong> (i.e.alternative pile driving method), the Contractor‟s <strong>Environmental</strong> Manager must ensure that appropriatemitigative measures are implemented to address any potential environmental impacts associated withthe change in work in accordance with the requirements set out in this EMP.For the construction of the Toronto-York Spadina Subway Extension, there are seven primaryconstruction elements. These elements are:1. <strong>Station</strong> Box Construction2. Tunnel <strong>and</strong> <strong>Station</strong> Mobilization Construction Areas;3. Launch Shafts;4. Extraction Shafts;5. Emergency Exit Buildings;6. Tunnel Drives; <strong>and</strong>,7. Cross-Passages.2.1 STATION BOX CONSTRUCTIONConstruction of the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> will be completed in the following stages, each presentingunique requirements for natural features protection:Stage 1: Prepare the construction site by clearing <strong>and</strong> grading, reconfiguring utilities, <strong>and</strong> buildingconstruction facilities (i.e. storage areas, access roads, track diversion, etc.) in preparationfor tunnelling activities. (Tunnelling operations will commence from within the <strong>Station</strong> Box).Stage 2: Construct temporary shoring <strong>and</strong> first portion of the <strong>Station</strong> Box.Stage 3: Complete the construction of station box <strong>and</strong> above grade sections of the station, includingsite servicing, architectural finishes, <strong>and</strong> re-grading.2.2 TUNNEL AND STATION MOBILIZATION CONSTRUCTION AREASTunnel <strong>and</strong> <strong>Station</strong> Mobilization Construction Areas provide space to support construction activities,including office space, storage of materials, <strong>and</strong> use <strong>and</strong> maintenance of machinery. These areas areprimarily created by installing erosion <strong>and</strong> sediment control measures, clearing vegetation, gradingexisting ground, preparing granular working surfaces, <strong>and</strong> preparing surface water runoff controlfeatures. Once the construction areas are erected, the remainder of the work for support of excavationfor launch shafts, extraction shafts, station boxes, <strong>and</strong> TBM operations can commence.2.3 LAUNCH SHAFTSLaunch shafts are located within the Tunnel Mobilization Construction Areas <strong>and</strong> are typically 45 m to 55m long excavations. They are necessary to support TBM mining operations allowing for delivery ofmaterials <strong>and</strong> segmental lining to the TBMs as well as facilitating the removal of excavated spoil fromthe tunnels. The launch shafts are expected to be constructed using traditional soldier pile <strong>and</strong> laggingshoring systems. Dewatering rates <strong>and</strong> ground conditions at the sites are typical for this support ofexcavation type. Headwalls will be contiguous caisson detailed with a soft eye for mine-through by theTBM. The piling will be installed in drilled in holes to minimize noise <strong>and</strong> vibration. Since the shoringsystem is permeable, <strong>and</strong> since all excavations are expected to intercept a water-bearing granular soillayer, groundwater control will be necessary. The surrounding ground will be dewatered such that thegroundwater level is kept a minimum of 1.0 m below the base of excavation during all stages ofconstruction to allow for lagging installation <strong>and</strong> for stable, undisturbed <strong>and</strong> substantially dry sub-grade.In addition to groundwater lowering, pumping capacity will be sized to remove any process water,surface water runoff <strong>and</strong> precipitation from sumps in the graded excavation bottom. Erosion <strong>and</strong>sediment control measures are to be installed prior to any onsite construction activities.2.4 EXTRACTION SHAFTSConstruction of extraction shafts is very similar to launch shaft construction except the sole purpose is toreceive the TBMs at the end of the drives <strong>and</strong> they are not required to support the mining operation inany other way. Consequently, extraction shafts need only be 15m to 18m long. Excavation, shoring<strong>and</strong> dewatering requirements are as described in Section 2.3.2.5 EMERGENCY EXIT BUILDINGS (EEB)Emergency exit building (EEB) shafts are also constructed using similar methods as the launch shafts.Construction of the emergency exit buildings are expected to be completed in fourteen (14) stages.Each stage of the construction process presents unique requirements for the location <strong>and</strong> function ofconstruction laydown <strong>and</strong> staging areas, soil stockpiling, grading, excavation volumes, erosion <strong>and</strong>sediment controls, groundwater control, natural features protection, <strong>and</strong> other environmental elementsdiscussed herein. The construction staging is as follows:Stage 1: Install erosion <strong>and</strong> sediment controls.Stage 2: Strip <strong>and</strong> grade the construction area.Stage 3: Install vertical members of the excavation support system (piles <strong>and</strong> lagging) in auguredholes.Stage 4: Install ground water controls, <strong>and</strong> lower the water table such that it remains at least 1.0 mbelow the excavation bottom during all stages of construction.Stage 5: Begin excavating in lifts <strong>and</strong> install lagging <strong>and</strong> excavation support horizontal restraintsystem.Stage 6: Install mud slab at the excavation bottom.Stage 7: Backfill EEB shaft with pea gravel to provide support for stage 8.Stage 8: Complete TBM pass <strong>and</strong> segmental lining erection.Stage 9: Excavate pea gravel.Stage 10: Construct cast-in-place reinforced box structure using cut <strong>and</strong> cover technique.Stage 11: H<strong>and</strong> mine connection between EEB shaft <strong>and</strong> tunnels.Stage 12: Backfill excavation.Stage 13: Construct permanent EEB structure at ground level.Stage 14: Restore site.The above staging is applicable to conventional EEBs. In certain cases, <strong>TTC</strong> Systems require thatEEBs temporarily function as drop shafts for track work installation <strong>and</strong> in those instances constructionsequence is similar to the mine-through station at York University whereby the shoring vertical supportPage 10
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Planmembers (contiguous caisson headwalls) are installed first prior to TBM mine-through. After TBMpassage, excavation proceeds in the conventional manner <strong>and</strong> the segmental lining between theheadwalls is demolished <strong>and</strong> replaced with a permanent box structure.2.6 TUNNELLINGTunnel drives are to be completed in a single pass by two staggered drives using an earth pressurebalance method (EPBM) TBM. The ground cover above the tunnel crown varies from approximately 7mto 20m. The TBM will be operated in closed mode which will provide pressure within the excavationchamber against the soil. This will exert pressure thereby reducing the volume of ground loss <strong>and</strong>settlement at the surface. During the drive, appropriate soil conditioning will be utilized to facilitate <strong>and</strong>control spoil removal.The TBM will be equipped with a vacuum erection system to install the 5.4m internal diameter precastsegmental rings. Tail void grouting will be performed using a two (2) component grout through the tailshield. The grout injection pressure will be maintained slightly above hydrostatic pressure to counteractagainst the hydrostatic pressure acting on the tunnel annulus. The pressure is to be constantlymonitored. By grouting through the tail shield, the risk of soil infiltration around the tail brushes isreduced when compared to grouting through segmental voids. Grouting is to be completed through thetail shield as opposed to through the segments reducing the risk of failure by grouting from a movingpoint maintaining a consistent pressure as opposed to grouting from a stationary point which would feedthe grouting towards the moving TBM. The TBM will be equipped with an inflatable emergency seal tocover the tail shield area if there is a failure due to soil infiltration. Before the TBM begins the tunneldrive, the Contractor will be expected to build at least six (6) rings within the launch shafts off of thelaunching frame. At this point the correct function of the building procedure will be confirmed <strong>and</strong> anynecessary changes to these procedures will be completed before commencing undergroundconstruction. As the TBM advances, it is required that the biodegradable tail seal grease is continuouslyinjected under pressure to minimize risk of groundwater or backfill grout intrusion.The TBM will be equipped with electronic data logging to monitor all critical TBM operations. These logswill be monitored continuously <strong>and</strong> adjustments <strong>and</strong> maintenance will be performed as required. Surfacesettlement will be continuously monitored using ground movement monitoring points, building movementmonitoring points, <strong>and</strong> utility movement monitoring points.In specific locations along the alignment ground treatments such as jet grouting <strong>and</strong> compensationgrouting will be utilized to reduce settlement risks to buildings, structures <strong>and</strong> utilities.The TBM shall be inspected regularly <strong>and</strong> regular maintenance is to be performed, as a minimum,before each drive. Maintenance <strong>and</strong> monitoring protocols must address critical elements within the TBM(i.e. main bearings <strong>and</strong> tail shield brushes).Figure 2-1 depicts an EPBM TBM. Construction of the tunnels will be completed in seven (7) stages foreach tunnel drive. Each stage of the construction process presents unique requirements for the location<strong>and</strong> function of construction. The TBMs will be launched <strong>and</strong> extracted via shafts at specified locations.At these locations, specific requirements for construction laydown <strong>and</strong> staging areas, spoilmanagement, erosion <strong>and</strong> sediment controls, groundwater control, <strong>and</strong> select natural feature protectionwill be necessary. Unique requirements related to excavation volumes <strong>and</strong> natural <strong>and</strong> manmadefeature protection will be discussed (relative to the tunnel drives) herein. The construction staging is asfollows:Stage 1:Stage 2:Stage 3:Stage 4:Stage 5:Stage 6:Stage 7:Mobilize tunnel boring machine within designated launch shaft.Ensure that components for segmental tunnel liner assembly are in proper working orderby constructing at least six (6) rings within the excavated shafts off of the launchingframe. If rings are not constructed properly, make any required changes to ring-buildprocedure before commencing drive.Perform tunnel drive. During tunnel drive, ensure that all components are workingproperly <strong>and</strong> monitor equipment logs <strong>and</strong> perform necessary maintenance when required.During drive install precast segmental liners <strong>and</strong> perform grouting from tail shield to fill theannular space. Additional grouting measures may be required for specific locations.During drive continuously monitor settlement using movement monitoring pointsestablished prior to construction. Adjust tunnel construction accordingly.Demobilize TBM from extraction shaft <strong>and</strong> perform required maintenance prior to nexttunnel drive.Construct concrete invert <strong>and</strong> walk way.Figure 2-1 – Diagram of Earth Pressure Balance Tunnel Boring MachinePage 11
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan2.7 CROSS PASSAGESCross passages function as passage-ways <strong>and</strong> provide a connection between the twin tunnels to meetfire code requirements <strong>and</strong> box trackways provide space for <strong>TTC</strong> personnel as well as an emergencyegress path from a contaminated tunnel/box trackway (i.e., containing a smoke generating incident) to anon-contaminated.Cross passages will be constructed using h<strong>and</strong> excavation. Excavation will be carried out by a team ofminers equipped with compressed air h<strong>and</strong> tools. If required, small tracked mechanical excavators maybe used; however, the equipment will require additional safety considerations for on-site workers.Dewatering/depressurization will be required for construction of the cross-passages, which will becompleted using either gravity wellpoints or vacuum wellpoints from the surface, or dewatering from thetunnels underground. The dewatering/depressurization will allow for improved soil stability, increasedshear strength <strong>and</strong> cohesion of the soil. Breakout from the precast segmental lining of the runningtunnels is required prior to excavation of the cross passages. Temporary propping support will beinstalled in the running tunnel prior to breakout. The initial cross passage pilot excavation will be 6 feetin diameter using steel liner plate as initial support. The excavation will be exp<strong>and</strong>ed <strong>and</strong> sequentiallyexcavated <strong>and</strong> supported with steel liner plate to create the full cross passage cross section. Theannular space will be contact grouted. Upon completion of the cross-passage initial lining, awaterproofing system will be installed. The cross passage final lining will consist of cast-in-placereinforced concrete.Construction of the cross passages is expected to be completed in fourteen (14) stages. Theconstruction staging is designed as follows:Stage 1: If required, install erosion <strong>and</strong> sediment control measures.Stage 2: Probe drill, sample <strong>and</strong> test ground.Stage 3: Install temporary propping support frames in both running tunnels.Stage 4: Perform ground treatment (as required) including dewatering from surface.Stage 5: Mobilize equipment <strong>and</strong> materials.Stage 6: Sawcut opening in tunnel segmental lining in starting tunnel.Stage 7: Sequentially mine <strong>and</strong> support pilot tunnel using steel liner plate.Stage 8: Sequentially mine <strong>and</strong> support enlarged tunnel using steel liner plate.Stage 9: Sawcut opening in segments in adjacent tunnel.Stage 10: Install steel opening frame within sawcut openings in both tunnels.Stage 11: Install waterproofing.Stage 12: Install final lining.Stage 13: Remove temporary propping support frame in the running tunnels.Stage 14: Install mechanical, electrical <strong>and</strong> architectural elements.Page 12
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan3.1 GROUNDWATER MANAGEMENTGroundwater control measures must be implemented during excavation activities to ensure that a dry<strong>and</strong> safe working environment is maintained during the station box construction <strong>and</strong> tunnelling activities.It is the Contractor‟s responsibility to ensure that excavations <strong>and</strong> trenches are free of water throughoutthe construction period. Specifically, the Contractor will be required to:Lower groundwater levels <strong>and</strong> maintain levels at a minimum depth of 600 mm below the lowestpoint of station excavation;Lower groundwater levels <strong>and</strong> maintain levels at a minimum depth of 1.2 m below the invert ofthe shafts;Dewater in a manner that will prevent loss of soil <strong>and</strong> maintain stability of sites <strong>and</strong> the bottom ofthe excavation; <strong>and</strong>,Dispose of water in conformance with applicable by-laws <strong>and</strong> legislation in a manner notdetrimental to public or private property or the natural environment.A groundwater collection system will be built independently of the surface water drainage collectionsystem(s) at each site. Groundwater removed from the shafts (launch, extraction or EEB), station box,or cross passage excavations, will be transferred to the local storm or sanitary sewer system, at adischarge point located near to the excavation area. Prior to discharge, the following environmentalcontrols shall be implemented:Groundwater pump inlets or wells must be source filtered to remove particulate matter <strong>and</strong>additional surface filtering shall be completed where required;Flow meter(s) must be installed <strong>and</strong> the Contractor is responsible for metering <strong>and</strong> recordingtotal daily discharge of groundwater to each sewer;Discharges from the water treatment system must be tested against the parameters defined inthe City of Toronto Municipal Code-Sewers (Chapter 681). As discharge to the municipal stormsewer will ultimately flow into either Black Creek or Dufferin Creek, the PWQO Table 2St<strong>and</strong>ards must also be met;Water quality testing will be conducted as outlined in Section 4.1, prior to discharge;Test results shall be forwarded to the Commission‟s Representative within seven business daysfollowing the sample being taken;All chemical analysis must be completed by a laboratory certified by the Canadian Associationfor Laboratory Accreditation (CALA);The Contractor must comply with all applicable regulations related to the disposal/discharge ofgroundwater; <strong>and</strong>,The Contractor must demonstrate the ability to discharge to storm <strong>and</strong> sanitary (i.e. obtainappropriate permitting <strong>and</strong> approvals for both options) such that in the event that dischargescannot be directed to either storm or sanitary, the alternate discharge location may be selected.cadmium, chromium, copper, lead, manganese, mercury, nickel, zinc), total phosphorus, chloroform <strong>and</strong>bis (2-ethylhexyl) phthalate.Given the preliminary results, pre-treatment of the groundwater prior to release will be required, <strong>and</strong> theContractor(s) will be responsible for operating an on-site water treatment system to filter <strong>and</strong> treat anyparameters exceeding the respective City of Toronto Municipal Code for Sewers (sewer use by-law)<strong>and</strong>/or PWQO prior to release to the sanitary or storm sewer system, respectively. It should be notedthat elevated TSS concentrations were a function of how the test wells were developed <strong>and</strong> sampled<strong>and</strong> further testing will be required to assess the consistency of results obtained to enable formulation ofa more definitive strategy to manage groundwater.The selected treatment method is to be developed by the Contractor <strong>and</strong> will be submitted for approvalto the MOE <strong>and</strong> for review by the <strong>TTC</strong> before implementation. Included in the selected treatmentmethod, the Contractor must identify the last time the treatment systems were used <strong>and</strong> provideperformance information on the flow rates, as well the influent <strong>and</strong> effluent levels that were observed.3.1.1 DewateringDewatering will be implemented during the construction of the station box, all shafts <strong>and</strong> crosspassages. For dewatering works, a Permit to Take Water (PTTW) may be required.The groundwater dewatering Zones of Influence (ZOI) will be monitored throughout the constructionperiod <strong>and</strong> during the post-construction recovery period. Temporary (<strong>and</strong> localized) water tabledrawdown will be monitored in available monitoring wells in the vicinity of proposed excavations (i.e.where construction dewatering is to occur). Figure 3-2 indicates the ZOI for the full alignment of theTYSSE including the <strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>. Table 3-2 summarizes the estimatedZOI, estimated groundwater inflow, direct precipitation inflow, <strong>and</strong> total dewatering rate for the <strong>South</strong><strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> Sites prepared by Golder (Predicted Dewatering Rates <strong>and</strong> Zone ofInfluence for Excavation Locations – Toronto-York Spadina Subway Extension – Draft TechnicalMemor<strong>and</strong>um, March 3, 2010). The direct precipitation input is based upon a five (5) year return periodstorm event for a 24-hour rain event duration.Preliminary Geo-Engineering reports indicate that some heavy metals were identified in groundwater atthe <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> above the City of Toronto Municipal Code – Sewers (Chapter 681)st<strong>and</strong>ards for storm, namely manganese, total suspended solids <strong>and</strong> zinc. No exceedances of thesanitary limits were identified.Similarly, preliminary groundwater sampling was also completed along the <strong>South</strong> <strong>Tunnels</strong> alignment,with seven (7) groundwater samples submitted for chemical analysis. Groundwater results fell within theCity of Toronto Municipal Code – Sewers (Chapter 681) with the exception of TSS, total metals (arsenic,Page 14
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanFigure 3-1 – Zone of Influence MapPage 15
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanTable 3-2 – Dewatering ZOI <strong>and</strong> Estimated Dewatering RatesSiteEstimatedZone ofInfluence(m)EstimatedGroundwaterInflow(m 3 /day)DirectPrecipitationInput 1(m3/day)TotalDewateringRate(m 3 /day)RecommendedGroundwaterMonitoringLocations 2ES5 N/A 0 460 460 N/A N/AObserved Rangeof GroundwaterElevation 3(masl)CP1 200 610 0 610TSW-006ATSW-006BTSW-009182 to 183183 to 185182 to 188EEB1 350 1,700 25 1,725 TSW-012 184 to 188TSW-013 185 to 186CP2 140 1,100 0 1,100TSW-019 190 to 192SWS-006 190 to 193LS5 325 2,400 350 2,750SWS-028 189 to 190SWS-006 190 to 193SWS 375 3,800 2,800 6,600SWS-028 189 to 190SWS-006 190 to 193LS4 250 700 750 1,450SWS-028 189 to 190TFW-020B 175 to 177CP3 < 50 30 0 30TFW-020C 182 to 193TFW-007A 179 to 185EEB2 < 50 15 25 40TFW-007B 191 to 193CP4 < 50 10 0 10 TFW-011 176 to 177TFW-016A 180 to 181EEB3 < 50 35 20 55TFW-016B 185 to 194TFW-016A 180 to 181ES4 250 2,000 350 2,350TFW-016B 185 to 194Notes:- Reflects removal of 0.06 m of direct precipitation within 4 hour period.– Subject to confirmation following finalization of construction plan.– From monthly groundwater elevation monitoring since March 2009.N/A - not applicable/availableThe Contractor must ensure that process water is segregated from groundwater during dewateringactivities, as process water may contain TBM oil <strong>and</strong> grout contaminants <strong>and</strong> require additionaltreatment. Process water may be required to, but not limited to, passage through an oil water separator<strong>and</strong> settlement tank in addition to the st<strong>and</strong>ard groundwater treatments required to meet the respectiverequirements indicated in Section 3.1. If on-site treatment of process water is not possible, theContractor may be required to arrange for its disposal off-site by a licensed company.Plans for the selected treatment method developed by the Contractor will be submitted to theappropriate regulator for approval <strong>and</strong> to the Commission‟s Representative for review prior toimplementation.All dewatering locations are expected to have backup power in case of a power outage. The backuppower should be sufficient to provide enough power to run all required pumps for dewatering for all well<strong>and</strong> shaft locations.When discharging to the municipal storm sewer, in addition to meeting the storm sewer by-lawguidelines, the PWQO st<strong>and</strong>ards will also be applied throughout the construction period for themanagement of the quality of discharge water to local receiving watercourses (Dufferin Creek <strong>and</strong> BlackCreek). Specific locations of storm sewer outfall discharge points <strong>and</strong> their associated receivingwatercourse are outlined in Table 3-3 <strong>and</strong> shown in Figure 5-6.Table 3-3 – Storm Sewer Outfall LocationsSite Outfall Location Discharge LocationEEB-3 ST-1 Black CreekES-4 ST-1/ST-4 Black CreekEEB-2 ST-2 Black CreekCP-4 ST-3 Dufferin CreekCP-1 ST-3 Dufferin CreekEEB-1 ST-3 Dufferin CreekCP-2 ST-3 Dufferin CreekLS-5 ST-3 Dufferin Creek<strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> ST-3 Dufferin CreekLS-4 ST-3 Dufferin CreekCP-3 ST-3 Dufferin CreekNorth Wye (DEPTHS) ST-3 Dufferin CreekPotential effects on the receiving aquatic environment from discharge into the municipal storm sewer atthese outfall locations are discussed further in Section 3.4.3.1.2 Monitoring Well Protection <strong>and</strong> DecommissioningAll monitoring wells identified in the Contract Drawings that are not scheduled for decommissioning mustbe maintained <strong>and</strong> protected from damage by construction activities. If a monitoring well is damagedduring construction activities, the Contractor must have the well decommissioned as per O. Reg. 903<strong>and</strong> replaced in a representative location selected by the Commission‟s Representative. The damagedwell is to be replaced within fourteen (14) days of the incident or when the damage was discovered,whichever is earlier.Existing wells that are identified for ab<strong>and</strong>onment <strong>and</strong> will not be fully removed by excavation must beproperly decommissioned. Wells must be decommissioned in accordance with the Wells Regulation, O.Reg. 903, <strong>and</strong> the MOE‟s recommended method for plugging wells, in a manner satisfactory to theCommission‟s Representative. Proper decommissioning records must be maintained <strong>and</strong> submitted tothe MOE with a copy provided to the Commission‟s Representative upon completion of thedecommissioning work.Page 16
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan3.2 EROSION AND SEDIMENT CONTROLIn order to minimize the off-site transport of construction sediments <strong>and</strong> prevent erosion within thereceiving surface drainage system, comprehensive siltation <strong>and</strong> erosion control plans will be establishedfor each construction site. Erosion <strong>and</strong> Sediment Control (ESC) measures on all construction sites willbe designed as per the Erosion <strong>and</strong> Sediment Control Guideline for Urban Construction, December2006 (ESC Guideline), prepared by the Greater Golden Horseshoe Area Conservation Authorities(GGHACA). Specific regulations <strong>and</strong> recommendations will be considered based on site location (Cityof Toronto) <strong>and</strong> site-specific natural features <strong>and</strong> ecologically sensitive receptors.The guiding principles of the GGHACA‟s ESC Guideline focus on mitigating the large scale impactsurban development can have on the natural environment using a multi-barrier approach with a dynamicESC plans, including improved inspection.ESC Planning entails the following principles:Multi-barrier approach;Retain existing vegetation <strong>and</strong> stabilize ground with vegetation where possible;Limit duration of soil exposure <strong>and</strong>/or phase construction;Limit size of disturbed area;Maintain overl<strong>and</strong> sheet flow <strong>and</strong> avoid concentrating flow;Store <strong>and</strong> stockpile soil away from watercourses, drainage structures, <strong>and</strong> the top of slopes;ESC training for Contractors <strong>and</strong> construction management;Prepare an adaptive ESC plan; <strong>and</strong>,Assess ESC measure before <strong>and</strong> after rain <strong>and</strong> significant snowmelt events.Preparation of the construction sites will entail the hardening of the ground surface to provide a stablebase for construction activities. This change will affect both the quantity <strong>and</strong> quality of runoff. The addedconstruction sediment from each site‟s runoff has the potential to have negative effects on the localaquatic resources. The goal of the ESC measures is to preserve <strong>and</strong> protect the aquatic resources <strong>and</strong>other natural features of identified environmentally-sensitive sites affected by the construction for theTYSSE Project. On all sites, multiple layers of protection are to be employed along with a regulatedprocess for monitoring <strong>and</strong> maintenance to ensure that the measures are functioning within approvedlimits. ESC condition reports will be prepared as part of the monitoring <strong>and</strong> maintenance plan. WhereESC measures are found to be in an unacceptable condition they are to be repaired or replacedimmediately.Erosion <strong>and</strong> sediment control measures include:Erosion prevention measures (seeding, mulch, vegetative cover).Sediment controls: perimeter (silt fence), settling (excavated sediment traps), <strong>and</strong> filtration (catchbasin inserts).ESC measures for the TYSSE construction sites may include, but are not limited to:Heavy Duty Silt Fence: Woven Geotextile, installed as per OPSD 219.130.Jersey Barrier with Silt Fence: Non-woven Geotextile placed against the site perimeter jerseybarriers <strong>and</strong> weighted with s<strong>and</strong>bags to provide perimeter control on paved surfaces.Staked Sediment Control Logs: Continuous knitted mesh netting filled with compost filter media.Control log to be staked to ground <strong>and</strong> used in place of heavy duty silt fence for perimeter controlor rock flow check dam in ditches.Truck Wash: Automated truck wheel washing system to spray construction vehicles prior to exitingsite to reduce mud <strong>and</strong> debris tracking onto adjacent streets. Systems should including waterrecycle, sediment management, <strong>and</strong> a winter heating package. Installed as per manufacturer‟srecommendations.Mud Mat: Pad constructed of clear stone underlain with geotextile at the site access points toremove mud <strong>and</strong> debris from vehicles prior to exiting the site. Installed as per GGHACA‟s ESCGuideline (Appendix C – Vehicle Tracking Control/Mud Mats).Concrete Wash-out <strong>Station</strong>: Single, stackable or multiple rings of continuous knitted mesh nettingfilled with compost filter media, for containing concrete washout water.Storm Drain Inlet Protection: Sediment control barrier consisting of either a filter fabric around acatch basin inlet with crushed stone over the grate or manufactured geotextile sack inserted insidethe catch basin.Sediment Traps: Depression area which allows runoff to pond, which permits coarser particles tosettle out. Installed as per OPSD 219.220.Temporary Rock Check Flow Dams: Installed as per OPSD 219.210 <strong>and</strong> OPSD 219.211.Sediment Control Ponds: Designed <strong>and</strong> installed as per the MOE Surface Water Management(SWM) Planning <strong>and</strong> Design Manual, 2003.Erosion Control Blankets: Installed as per GGHACA‟s ESC Guideline (Appendix C – ErosionControl Blankets, Mats, Nets) to exposed slopes greater than 2H:1V.Mulch: Partially composted chipped woody material placed on exposed soils.Hydroseed: Applied as per manufacturer‟s recommendations <strong>and</strong> GGHACA‟s ESC Guideline(Appendix C - Hydroseeding).As part of the ESC design process, ESC Reports, including ESC, construction storm watermanagement, <strong>and</strong> grading plans, will be produced for each construction site on the alignment detailingthe surrounding area, adjacent sensitive features <strong>and</strong> critical areas, soil conditions, condition of existingreceiving water, <strong>and</strong> the proposed ESC measures such as material used, ESC pond, <strong>and</strong> stockpiledetails. Ultimately, the Contractor in charge of each construction site is responsible for ensuring thelayout of the site, with approval from responsible parties. Where changes in construction staging <strong>and</strong>arrangement of Construction Sites occurs that are not anticipated by the ESC plans a revised ESC planmust be prepared by the Contractor. The revised plan must show the modification to the ESC plans toaccount the changes in construction staging <strong>and</strong> Construction Site arrangement. These revised ESCplans must be submitted for review by the Commission‟s Representation prior to implementation of theconstruction staging <strong>and</strong>/or arrangement of the Construction Sites.3.3 SURFACE WATER RUNOFF MANAGEMENTSurface water runoff management requires the implementation of mitigation measures by theContractor(s) during construction to ensure the following:Protection of local vegetation from flooding <strong>and</strong>/or soil saturation (frequent or prolonged inundationof soil);Proper site drainage is maintained in order to provide a dry <strong>and</strong> safe work environment; <strong>and</strong>,Protection of excavations <strong>and</strong> trenches against flooding <strong>and</strong> damage.Page 17
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanIn order to facilitate proper management of surface water runoff, the Contractor(s) is required toconstruct a surface water runoff drainage collection system(s) as per the design specifications. TheContractor(s)must monitor the effectiveness of the drainage collection system(s) prior to thecommencement of construction activities <strong>and</strong> throughout construction to ensure the system isfunctioning as designed.3.3.1 <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> BoxSurface water runoff management measures at the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> site must be maintainedindependently of the groundwater drainage collection system(s), which will collect groundwater,groundwater seepage <strong>and</strong> process water, as discussed in Section 3.1. The surface water runoffcollection system(s) will collect <strong>and</strong> direct water away <strong>and</strong> clear of work areas, excavations, <strong>and</strong>trenches, <strong>and</strong> into an approved existing drainage system in close proximity to the site, more specificallythe municipal storm sewer system. The direction of surface water runoff into the storm sewer inlet mustbe carried out in a manner not detrimental to public/private property or the natural environment.During the construction process, it can be expected that surface water runoff will be elevated in totalsuspended solids (TSS) <strong>and</strong> turbidity due to its frequent contact with exposed disturbed soils. The site‟sSediment <strong>and</strong> Erosion Control Plan should be executed in combination with the use of some form ofsettling <strong>and</strong>/or filtration to reduce TSS <strong>and</strong> turbidity in surface water runoff.To mitigate potential effects associated with the management of surface water, the Contractor(s) mustensure that effectiveness of the surface water drainage collection system(s) is maintained at all times<strong>and</strong> all associated comprehensive environmental measures <strong>and</strong> controls are carried out as described inthe surface water runoff management specifications. The Contractor(s) must also ensure that the site‟sSediment <strong>and</strong> Erosion Control Plan <strong>and</strong> ongoing monitoring <strong>and</strong> mitigation measures are carried out atall times. Contingency Plans are to be implemented as necessary, such as the Severe Weather Plan<strong>and</strong> Spills Plan.be installed within the catch basin as an additional measure to reduce sediment from entering the stormsewer.3.4 AQUATIC HABITAT MANAGEMENTAquatic habitat management measures are to be implemented by the Commission‟s Representativeduring construction activities to ensure the protection of aquatic habitat, specifically, Black Creek <strong>and</strong>Dufferin Creek. Management activities must ensure compliance is maintained with the Fisheries Act, O.Reg 166/06 TRCA: Regulation of Development, Interface with Wetl<strong>and</strong>s <strong>and</strong> Alterations to Shorelines<strong>and</strong> Watercourses, <strong>and</strong> City of Toronto By-laws. As well as adhere to any potential forthcomingpermitting <strong>and</strong> approval requirements such as the MOE Permit to Take Water <strong>and</strong> a DFO Letter ofAdvice.As no aquatic habitat has been identified within the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>and</strong> south tunnel area, themanagement of aquatic habitat comes into play when groundwater is discharged into the municipalstorm sewer system, <strong>and</strong> ultimately into the natural environment at storm sewer outfall locations. If thisroute is selected for discharge, there is potential for off-site impacts to occur to the receivingwatercourses. These outfall locations have been identified in Table 3-3 <strong>and</strong> include Black Creek <strong>and</strong>Dufferin Creek.TO BE COMPLETED3.3.2 <strong>South</strong> <strong>Tunnels</strong>Temporary surface water management measures are expected to be used at all sites associated withthe <strong>South</strong> <strong>Tunnels</strong>. The surface water management measures at these sites must be maintainedindependently of the groundwater drainage collection system(s), which will collect groundwater,groundwater seepage <strong>and</strong> process water, as discussed in Section 3.1. This surface water runoff isexpected to require settling prior to discharge.At paved sites, such as existing parking lots <strong>and</strong> roads, a swale <strong>and</strong> jersey barrier design will beinstalled to direct all surface flow from shafts <strong>and</strong> towards the nearest storm sewer catch basin(s). Anexcavated trench backfilled with clear stone will be installed around the catch basin to allow settling priorto discharge. The clear stone will allow construction vehicles to maintain traffic flow within the confinedconstruction site.For sites where the Construction Staging Area will be constructed within a vegetated area, for exampleExtraction Shaft ES-5, a temporary sediment trap as per OPSD 219.220 will be installed. Both thetemporary sediment trap <strong>and</strong> the clear stone filled trench will be sized to be able to h<strong>and</strong>le the additionalflow encountered during a 1 in 100 year storm due to construction activities (i.e. decrease inperviousness of ground conditions). Once the surface water runoff passes through the temporarysediment trap or clear stone filled trench it will enter the nearest catch basin. A storm inlet protection willPage 18
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanTable 3-4 – Summary of Thermal <strong>and</strong> Erosion AssessmentTO BE COMPLETEDDischarge Point(Outfall Location)ReceivingWatercourseProposedDischarge Rate(L/sec)DRYProposedDischarge Rate(L/sec)WETEstimatedExistingBaseflow(L/sec)ErosionThreshold(L/s)Estimated Max.Temp. ofReceivingWatercourse(°C)EstimatedTemperature ofGroundwaterDischarge (°C)Estimated Max.Thermal Influenceon ReceivingWatercourse (°C)ST-1(Option 1)Black CreekST-1(Option 2)Black CreekST-1(Option 3)Black CreekST-2Black CreekST-3DufferinCreekST-4(Option 1)Black CreekST-4(Option 3)Black CreekPage 19
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan3.4.1 Water QualityImpacted surface water from a spill or water not meeting the target objectives that is released ordischarged into the storm sewer system, <strong>and</strong> ultimately the natural environment, may cause immediateto long term impacts on water quality of the receiving watercourses (Black Creek & Dufferin Creek).These impacts on water quality have potential to result in an alteration in the aquatic community fromphysiological stress to death. To mitigate potential effects associated with the release or discharge, theContractor(s) must first immediately stop the release or discharge of the impacted water into the stormsewer <strong>and</strong> refrain from discharging until water quality is proven acceptable to municipal storm sewerguidelines <strong>and</strong> PWQO criteria. Ongoing compliance with the established groundwater <strong>and</strong> storm watercollection drainage plan(s), groundwater monitoring plan as outlined in section 4.1, sediment <strong>and</strong>erosion control plans, as well as Contingency Plans (i.e. Spills) is required to mitigate potential impactsrelated to water quality.Trees were mapped <strong>and</strong> inventoried by species, size (DBH) <strong>and</strong> health. Tree Protection & PreservationPlans were prepared for each construction area. The plans also include recommendations formeasures that will protect the long-term tree health.Tree protection is in accordance with City of Toronto Municipal Code 813 – Trees, which includes ArticleII (City Owned Trees) <strong>and</strong> Article III (Private Trees). Tree protection zones, as per the City of TorontoTree Protection Policy <strong>and</strong> Specification for Construction Near Trees (March 2009), will be identified asrequired on the corresponding construction site plans.3.5.1 Tree Protection ZonesAll trees that are to be retained within or adjacent to the <strong>South</strong> Tunnel construction zones <strong>and</strong> <strong>Sheppard</strong><strong>West</strong> <strong>Station</strong> will require tree protection zones (TPZs).3.4.2 Thermal ChangesTO BE COMPLETED3.4.3 Stream Erosion (sedimentation)TO BE COMPLETED3.5 VEGETATION PROTECTIONDetailed plant <strong>and</strong> tree inventories were conducted at the <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> area <strong>and</strong> along the<strong>South</strong> Tunnel alignment at the construction sites. The vegetation communities were documentedaccording to the Ecological L<strong>and</strong> Classification (ELC) System for <strong>South</strong>ern Ontario 1 .The following are the locations where the vegetation surveys were conducted for the <strong>South</strong> Tunnel:Downsview <strong>Station</strong> Connection to Wilson Yard, Parc Downsview Park, west side of Allen Road,south of <strong>Sheppard</strong> Avenue;Extraction Shaft #5 (ES-5), berm between Dufferin Street <strong>and</strong> Allen Road, just north of <strong>Sheppard</strong>Avenue <strong>and</strong> west of Allen Road;EEB-1, north side of Kodiac Crescent <strong>and</strong> Whitehorse Road;Cross Passage #2 (CP-2), <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, <strong>and</strong> Track Laydown Area, Parc DownsviewPark, south side of <strong>Sheppard</strong> Avenue <strong>West</strong>, east of the GO tracks;<strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong>, Parc Downsview Park, south side of <strong>Sheppard</strong> Avenue at the GO tracksCP-3 area, west side of Tuscan Gate, north of <strong>Sheppard</strong> Avenue;EEB-2, north side of St. Regis Crescent, east of Keele Street; <strong>and</strong>,EEB-3, intersection of Keele Street <strong>and</strong> Toro Road.1 Lee, H. T., W.D. Bakowsky, J. Riley, J. Bowles, M. Puddister, P. Uhlig <strong>and</strong> S. McMurray. 1998.Ecological L<strong>and</strong> Classification for <strong>South</strong>ern Ontario: First Approximation <strong>and</strong> Its Application.Ontario Ministry of Natural Resources, <strong>South</strong>central Science Section, Science Development<strong>and</strong> Transfer Branch. SCSS Field Guide FG-02.Page 20
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanTable 3-5 provides the minimum tree protection distances required for TPZs as per the City of TorontoTree Protection Policy. It may be necessary to implement other protective measures in addition toestablishing TPZs to properly ensure tree health. These additional measures may include: addingmulch to the root zone, aeration of the soil, pruning for deadwood, <strong>and</strong> removing limbs that may beimpacted by construction activities. Additional measures will be implemented at the direction of acertified arborist.Within areas designated as TPZs, the following guidelines specified by the Tree Protection Policy, needto be adhered to:No construction activities;No altering of grade by adding fill, excavating, trenching, scraping, dumping, or disturbance of anykind;No storage of construction materials, equipment, soil, construction waste, or debris;No disposal of any liquids (e.g. concrete wash-out, gas, oil, etc.);No movement of vehicles or machinery;Directional micro tunnelling <strong>and</strong> boring may be permitted within the limits of a TPZ subject toproper approval; <strong>and</strong>,An exploratory dig, either by h<strong>and</strong> or using low water pressure hydro vac method, must becompleted prior to commencing with open face cuts outside the TPZ that require root pruningperformed by a certified arborist or approved tree professional.Table 3-5 – Tree Protection Zones for City-owned <strong>and</strong> Private TreesTrunk Diameter (DBH) Minimum Protection Distances Required 1< 10 cm 1.2 m10-29 cm 1.8 m30 2 -40 cm 2.4 m41-50 cm 3.0 m51-60 cm 3.6 m61-70 cm 4.2 m71-80 cm 4.8 m81-90 cm 5.4 m91-100 cm 6.0 m> 100 cm 6 cm protection for each 1 cm diameter1 Tree Protection Zone distances are to be measured from the outside edge of the tree base.2 Diameter (30 cm) at which trees qualify for protection under the City of Toronto private tree by-law.TPZs will be delineated using tree protection barriers that are to be constructed of plywood or plasticweb hoarding or equivalent as approved by a certified arborist. Support <strong>and</strong> bracing are to be outsidethe TPZ <strong>and</strong> should minimize root damage outside the TPZ. Where the roots of a protected tree need tobe protected outside of a TPZ, root protection consisting of a combination of filter fabric, clear crushedstone placed in a 15 cm deep layer, <strong>and</strong> steel plating or equivalent, shall be installed as instructed by acertified arborist.In addition to the establishment of Tree Protection Zones (TPZ), the following specifications arerecommended:1. Before beginning work, the Contractor <strong>and</strong> the certified arborist should meet on-site to reviewwork procedures, access routes, storage areas <strong>and</strong> the TPZ or other tree protection measures.2. Any underground utilities shall be routed outside the TPZ, or use tunnelling or boring methods forinstallation.3. Any root damage occurring during construction should be cut cleanly to the sound tissue.4. Any injury to a tree during construction should be evaluated by a certified arborist.5. Any pruning of trees for construction clearance shall be performed by a certified arborist.3.5.2 Tree RemovalWhere trees are to be removed, proper approval must first be obtained from the appropriate authority.Removal, cost, <strong>and</strong> replacement arrangements will be made with the governing authority. A permit isrequired from the City of Toronto‟s General Manager Parks, Forestry <strong>and</strong> Recreation for all city-ownedtrees prior to injuring, destroying or removal. For trees on private property, a permit is required prior toinjuring, destroying or removing any tree that is 30 cm DBH or greater.Page 21
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanAll trees in the <strong>South</strong> Tunnel Contract area are within the Canadian Food Inspection Agency (CFIA)Regulated Area for Asian Long Horned Beetle (ALHB) <strong>and</strong> Emerald Ash Borer (EAB). Do not movewood debris from trees of the following species out of the Regulated Area for ALHB (Dufferin west toHwy 27 <strong>and</strong> Rutherford Road south to Hwy 401 & 409).Acer sp. (Maple)Aesculus sp. (Horse Chestnut)Salix sp. (Willow)Ulmus sp. (Elm)Betula sp . (Birch)Platanus sp. (Sycamore - London Plane Tree)Celtis sp. (Hackberry)Populus sp. (Poplar)Sorbus sp. (Mountain Ash)Albizia sp. (Silk Tree)All Ash sp. (Fraxinus) are host trees for EAB.The Contractor shall take all woody debris from the above species to the regulated disposal yard thisincludes wood, logs, wood chips, branches, brush <strong>and</strong> leaves.Regulated Disposal Yard:Dufferin Transfer <strong>Station</strong>:35 Vanley Crescent (south of Finch off Chesswood Drive), North York416-392-3161Monday - Friday 6am-6pmSaturday <strong>and</strong> Sunday – Closed3.5.3 Trimming/Pruning/Root Cutting3.6 WILDLIFE PROTECTION3.6.1 Breeding BirdsClearing <strong>and</strong> construction activities for the TYSSE must be done in compliance with the federalMigratory Birds Convention Act. The Act is applied through The Regulations Respecting the Protectionof Migratory Birds that states that “[…] no person shall disturb, destroy or take a nest, egg […] of amigratory bird.” This law protects all birds aside from the introduced species European Starling, HouseSparrow, <strong>and</strong> Rock Pigeon. Bird nests that are destroyed during the course of construction <strong>and</strong> otherrelated activities is referred to as “incidental take” <strong>and</strong> is illegal except under the authority of a permitobtained through the CWS (Canadian Wildlife Service).During construction staging planning, vegetation clearing or tree cutting should be scheduled outside ofthe breeding bird period, spring <strong>and</strong> early summer. It is preferential for construction activities to beginprior to the breeding bird period so that birds arriving to nest in the area will naturally avoid theconstruction area <strong>and</strong> establish alternative breeding territories.If clearing <strong>and</strong> other construction activities can be planned outside of the breeding bird period, the risk ofdisturbing nests <strong>and</strong> eggs is greatly reduced. If disruptive activities must occur during the breeding birdperiod, a detailed nest survey must be undertaken by a qualified biologist. Areas with active nestscannot be disturbed until the young have fledged. Where no active nests are found, disruptive activitiesmay occur only within three (3) days of the survey. The survey must be repeated if the work is to takelonger than three (3) days.All cleared vegetation must be removed immediately from site as birds may nest in the piles <strong>and</strong> preventtheir removal until after the young have fledged.If nests are discovered they must be protected by providing an area of no disturbance around the nestuntil the young have fledged. As the zone of no disturbance is species dependent, contact the avianbiologist to identify the species <strong>and</strong> assess the no disturbance zone required.Following the City of Toronto‟s Tree Protection Policy:Any roots or branches which extend beyond the TPZ indicated on this plan which require pruning, mustbe pruned by a certified arborist or other tree professional as approved by Urban Forestry. All pruningof tree roots <strong>and</strong> branches must be in accordance with good arboricultural st<strong>and</strong>ards. Roots locatedoutside the TPZ that have received approval from Urban Forestry to be pruned must first be exposed byh<strong>and</strong> digging or by using a low pressure hydro vac method. This will allow a proper pruning cut <strong>and</strong>minimize tearing of the roots. The certified arborist/tree professional retained to carry out crown or rootpruning must contact Urban Forestry no less than 48 hours prior to conducting any specified work.Page 22
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan4. MONITORING AND ADAPTIVE MANAGEMENT PLANSMonitoring of the construction activities allows for assessment of predicted effects on the surroundingenvironment <strong>and</strong> key receptors with the collection of data <strong>and</strong> documentation of observations. While theproactive measures detailed in Section 3 provide the first line of defence, by monitoring, it can beassumed that the ultimate protection levels are maintained. All parameters summarized in Table 4-1shall be monitored.Monitoring plans will be carried out with reference to baseline, trigger, <strong>and</strong> alarm values (levels) thesereference points are described below <strong>and</strong> are applied to monitoring activities outlined in Table 1-1;monitoring periods are defined in Section 1.6.3, Monitoring Responsibilities.Baseline levels represent the monitoring levels that must be consistently met to ensure that noenvironmental impacts are sustained during the Project undertaking. Baseline levels were developedbased on the legislative monitoring requirements dictated in Project-specific agreements, municipal bylaws,<strong>and</strong> supportive guidelines established by applicable organizations.Trigger levels are above the baseline level <strong>and</strong> are typically, but not always set by governing bodies oraccepted st<strong>and</strong>ards (i.e. the level required by agreements, legislation <strong>and</strong> guidelines); however, ifpromptly addressed, short-term conditions at the trigger level should not cause environmental impact. Iftrigger levels are reached, the Contractor must investigate the cause of the exceedance above thebaseline values <strong>and</strong> implement appropriate action plan <strong>and</strong> appropriate adaptive managementmeasures. During the investigation, increased monitoring shall be implemented so that exceedancevalues can be closely tracked. If the Contractor‟s EIL submissions indicate ongoing monitoring resultsat the trigger level (i.e. above the baseline), the Commission‟s Representative shall investigate <strong>and</strong>require the Contractor(s) to implement an adaptive management program.If the alarm level is reached, the Contractor(s) must notify the Commission‟s Representativeimmediately. The appropriate action plan, adaptive management program, <strong>and</strong> contingency plan mustbe implemented immediately, <strong>and</strong> a long-term solution developed. If the cause of the alarm level iscontinuous or if it has potential to reoccur, the Commission‟s Representative may require thesuspension of activities contributing to the exceedance until appropriate safeguards have been put inplace by the Contractor.Monitoring action pathways have been developed for implementation when a baseline, trigger or alarmvalue is met are provided for each appropriate monitoring componentPage 23
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanGroundwaterDewateringDischarge QualityTable 4-1 – Monitoring Plan <strong>and</strong> Associated Baseline, Trigger <strong>and</strong> Alarm ValuesParameter Location St<strong>and</strong>ard Responsibility Frequency Baseline Trigger Alarm1x day for the first week of pumpingprior to dischargeAt applicable City of TorontoDischarge point from water2x week (every three (3) or four (4)City of Toronto Municipaltreatment or groundwaterdays) for the next three (3) weeksSewer Use By-law <strong>and</strong> PWQOMeets applicable st<strong>and</strong>ards forCode (all parameters) Contractor(s)- EM1x month thereafterst<strong>and</strong>ards or one sampling eventsump to municipal sewerall parameters<strong>and</strong> PWQOAs required by relevant authorities, ifwith parameters above the(storm or sanitary)greater than specified above.applicable st<strong>and</strong>ardAbove applicable City of TorontoSewer Use By-law <strong>and</strong> PWQOst<strong>and</strong>ards when re-sampled afterinitial exceedanceGroundwaterDewateringDischarge Filter(s)(if required)Surface WaterRunoffManagementSurface WaterTemperatureStream ErosionDischarge of groundwatersump, before entering stormsewerSurface water drainagecollection system(s),<strong>Sheppard</strong><strong>West</strong> <strong>Station</strong> Site <strong>and</strong> tunnelconstruction locationsDischarge point to municipalsewer (storm or sanitary)Black Creek <strong>and</strong> DufferinCreek, at storm sewer outfallsFilter manufacturingguidance manualProper site drainage ismaintained <strong>and</strong> thesurface water drainagecollection system(s) is ingood functionTBCBaseline conditions priorto groundwater dischargeto storm sewerContractor(s)- EMContractor(s)- EMTBCCommission‟sRepresentative-FluvialGeomorphologist2x day visual checkReplace as necessaryFrequent daily observationsPrior to, during <strong>and</strong> post forecasted20mm/24hour rain event or thaw eventTBCTBCFiltration systems are functioning<strong>and</strong> filters are below 80% of theirmaximum capacity according tothe accompanying guidancemanualNo evidence of spills, no on-sitefloodingFiltration systems are functioning<strong>and</strong> filters are between 80% <strong>and</strong>95% of their maximum capacityaccording to the accompanyingguidance manualObserved areas of pooledsurface water or saturated soilsFiltration are not functioning <strong>and</strong>filters have reached theirmaximum capacity according tothe accompanying guidancemanualSpill or deleterious substance ispresent within surface waterrunoff, observed on-site floodingTBC TBC TBCTBC TBC TBCGroundwaterLevelTerrestrial HealthErosion <strong>and</strong>Sediment ControlsShafts <strong>and</strong> <strong>Station</strong> Box<strong>Station</strong> Site, tunnelconstruction locationsDewatering SpecificationVisual SurveyCommission‟sRepresentativeContractor(s) –Arborist <strong>and</strong>/orTerrestrial EcologistThroughout Project site EMP Protocols Contractor(s)- EM1x weekly1x monthly (recovery period) for 1 yearperiod or 85% recovery2x annually during the growing seasonto inspect TPZ <strong>and</strong> tree conditionsPeriodically outside the growingseason for the duration of dewatering<strong>and</strong> recovery to inspect TPZ <strong>and</strong> treeconditions1x weeklyAfter large rainfall events (>20mm in24 hours)After significant snowmelt events1x daily during extended rain orsnowmelt periods1x monthly during inactive constructionperiods, where the site is left alone forthirty (30) days or longer0.7-1.2 m below the invert of theshafts600 mm below excavation floorEM does not identify anyconcerns with respect to tree orvegetation healthErosion <strong>and</strong> sediment controlsare functioning properly <strong>and</strong> arewithin the trigger levels outlinedin Table 4-3.0.6 m -0.7 m below the invert ofthe shafts500 mm below excavation floorEM identifies first signs of droughtstress (wilting of foliage) in trees<strong>and</strong> vegetationErosion <strong>and</strong> sediment controls atthe trigger levels outlined in Table4-3.
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan4.1 GROUNDWATER MONITORINGGiven the cost considerations for discharging to sanitary, groundwater discharges will be principallydirected to the storm sewer. However, the Contractor must have the appropriate permits to discharge toboth the storm <strong>and</strong> sanitary sewer system, as required. Diversion of pumped groundwater to municipalsewers must be recorded daily, either on an EIL or another agreed-upon form. The Contractor isresponsible for ensuring that discharges from the water treatment system are tested against the waterquality parameters defined in the City of Toronto Municipal Code – Sewers (Chapter 681), <strong>and</strong> PWQOguidelines (if discharging to storm sewer) as follows:Once a day for the first week of pumping prior to discharge (water is collected <strong>and</strong> contained untilresults from first two (2) days are received) at the commencement of dewatering;Twice a week (every three (3) or four (4) days) for the next three (3) weeks (water may bedischarged prior to receipt analytical results);Once a month thereafter (water may be discharged prior to receipt analytical results); <strong>and</strong>,As required by relevant authorities, if greater than specified above.The above testing cycle must be initiated by the Contractor as soon as groundwater discharge isdiverted to the storm sewer <strong>and</strong> must be completed separately at each construction site where differentsource water is discharged, including: station box (launch shafts), EEBs, extraction shafts <strong>and</strong> crosspassages,as required. All new source waters shall be analyzed at the discharge point as per theschedule outlined above.For sanitary discharge, the Contractor may monitor groundwater quality prior to treatment to confirmwhether groundwater meets sanitary sewer requirements without treatment. If the Contractor hascompleted monthly sampling that demonstrates that the groundwater consistently meets sanitary sewerdischarge limits 2 , then the Contractor may discharge untreated groundwater directly to sanitary betweenmonthly monitoring events, if the situation should arise that water cannot be discharged to storm sewer(i.e. permit may include storm discharge limitations during rain events or if temporary dewateringrequirements exceed permitted discharge quantities to storm). If groundwater does not consistentlymeet sanitary sewer discharge limits, the Contractor will be required to treat the groundwater prior todischarge according to the protocols outlined for storm sewer discharges.The Contractor shall submit laboratory results to the Commission‟s Representative within 24-hours ofreceipt. Laboratory results may be appended to the EILs <strong>and</strong> Weekly Summary Report.The action plan presented in Figure 4-1 shall be followed regarding any discharge of groundwater to themunicipal sanitary sewer system. Please note that all required permits must be obtained from therespective municipality prior to discharge to the municipal sanitary sewer system.Figure 4-1 – Discharge Water Action Plan – Municipal Sanitary <strong>and</strong> Storm Sewer4.1.1 Water Table DrawdownTemporary water table drawdown will be monitored at designated monitoring wells throughout theconstruction period <strong>and</strong> post-construction. These results will be incorporated into the broaderenvironmental monitoring (i.e. monitoring of terrestrial resources locally). Table 4-2 provides asummary of the groundwater level monitoring frequencies, potential monitoring locations for each site,<strong>and</strong> the observed range of groundwater elevations for each monitoring location. More frequentmonitoring may be required during start up of dewatering systems to assess predicted dewatering rates<strong>and</strong> effects.2 Groundwater meets the sanitary sewer by-law requirements for all parameters in four out of every five samplingevents (80%). The exemption shall only be allowed if there were no order of magnitude exceedances of anyparameters in any of the five sampling events.Page 25
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanSiteES5EstimatedZone ofInfluence(m)Table 4-2 – Dewatering Monitoring DetailsGroundwater LevelMonitoring FrequencyDuringConstructionPostConstructionRecommendedGroundwaterMonitoringLocations 1N/AObservedRange ofGroundwaterElevation 2(masl)The dewatering action plan presented in Figure 3-3 shall be followed to ensure proper groundwaterlevels are maintained within excavations for dewatering operations.CP1 200TSW-006ATSW-006BTSW-009182 to 183183 to 185182 to 188EEB1 350 TSW-012 184 to 188CP2 140TSW-013TSW-019185 to 186190 to 192LS5 325SWS-006SWS-028190 to 193189 to 190SWS 375LS4 250CP3 < 50WeeklyMonthly for1 yearperiod or85%recovery toobservedrange ofgroundwaterelevationSWS-006SWS-028SWS-006SWS-028TFW-020BTFW-020C190 to 193189 to 190190 to 193189 to 190175 to 177182 to 193EEB2 < 50TFW-007ATFW-007B179 to 185191 to 193CP4 < 50 TFW-011 176 to 177EEB3 < 50ES4 250TFW-016ATFW-016BTFW-016ATFW-016B180 to 181185 to 194180 to 181185 to 194North Wye(DEPTHS)80 TYU-003 190 to 1941 – Subject to confirmation following finalization of construction plan.2 – From monthly groundwater elevation monitoring since March 2009.Figure 4-2 – Area of Influence Dewatering Action PlanPage 26
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan4.2 EROSION AND SEDIMENT CONTROLThe monitoring protocols for erosion <strong>and</strong> sediment control measures will follow the GGHACA‟s ESCGuideline for Inspections <strong>and</strong> Performance Monitoring (Section 7.0).A monitoring <strong>and</strong> inspection program shall be developed by the Contractor for each construction siteprior to the commencement of construction activities. As stated in the GGHACA‟s ESC Guideline, thisprogram should include:1. Identification of Personnel: Names <strong>and</strong> contact information of Project members assigned to eachtask as well as agency/enforcement contacts. A communication protocol should also bedeveloped to ensure effective reporting <strong>and</strong> compliance.2. Details <strong>and</strong> locations of the environmental constraints for an undertaking (the project area or site)including maps, reports, approvals <strong>and</strong> permits. Specific attention should be directed to timingrestrictions <strong>and</strong> reporting requirements.3. Construction drawings detailing the erosion <strong>and</strong> sediment controls installed which are updatedthrough the construction period.4. High risk areas should be identified on these drawings <strong>and</strong> routinely evaluated. Greaterfrequency of monitoring requirements may be required for areas <strong>and</strong> protection measuresimmediately adjacent to soil stockpiles, excavations, dewatering locations, protectedfeatures/areas, <strong>and</strong> locations where site runoff discharges into a receiving watercourse, waterbody, or municipal sewer system.5. Inspection schedule: This should include inspection times, areas, <strong>and</strong> person(s) responsible forthe inspections. A „walk-through‟ inspection of the construction site should be undertaken inanticipation of large storm events (or a series of rainfall <strong>and</strong>/or snowmelt days) that couldpotentially yield significant runoff volumes. The regular inspections should occur during allconstruction stages <strong>and</strong> should be based on at a minimum the requirement identified in thepermits <strong>and</strong> approvals. Commonly this frequency is:On a weekly basis;After large rainfall events (>20 mm in 24 hours);After significant snowmelt events; <strong>and</strong>Daily during extended rain or snowmelt periods.During inactive construction periods, where the site is left alone for thirty (30) days orlonger, a monthly inspection should be conducted.6. All damaged erosion <strong>and</strong> sediment control measures should be repaired <strong>and</strong>/or replaced within48 hours of the inspection.As noted in Section 4, Table 4-1 shows the components of the monitoring program <strong>and</strong> the actions to betaken for each Erosion <strong>and</strong> Sediment Control (ESC) measure should the trigger or alarm level bereached. Ideally, with adequate monitoring, the ESC measures should be maintained daily or in a timelyfashion such that trigger levels are not reached.Figure 4-3 presents the action plan that shall be followed to ensure that the ESC measures aremaintained <strong>and</strong> functioning as intended.Table 4-3 – Monitoring for Erosion <strong>and</strong> Sediment Control MeasuresMeasure Monitoring / Trigger Level Action LevelHeavy Duty Silt Fence 30% full 50% fullJersey Barrier with Silt Fence 30% full 50% fullStaked Sediment Control Log 30% of height 50% of heightTruck WashAs specified by ManufacturerO&M ManualAs specified byManufacturer O&M ManualMud Mat 50% coverage 75% coverageConcrete Wash-out <strong>Station</strong> 30% full 50% fullInlet Sediment Control Device 15% full 30% fullSediment Trap 15% full 30% fullTemporary Rock Check Dam 15% full 30% fullSediment Control Pond 30% full 50% fullErosion Control Blanket 85% coverage
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanMonitoring requirements include:Frequent daily visual <strong>and</strong> odour observations of areas of collected surface water for spills <strong>and</strong> highturbidity levels;Frequent daily visual observations for flooding or areas of surface surface water runoff collection;Frequent daily inspections of the surface water drainage collection system(s) to ensure propermaintenance <strong>and</strong> function as provided in the design specifications;Weekly downloading of on-site meteorological station;Review meteorological data weekly <strong>and</strong> analyse <strong>and</strong> interpret air temperature <strong>and</strong> precipitation;<strong>and</strong>,Daily monitoring of Environment Canada weather forecast to anticipate <strong>and</strong> plan for rain <strong>and</strong> thawevents.If a 20 mm in 24 hour rain event is forecasted or a thaw event is predicted, the Contractor(s) mustensure all components of the surface water management system are functioning in good condition <strong>and</strong>all sediment <strong>and</strong> erosion control measures are inspected <strong>and</strong> functioning as designed. If a 20 mm in 24hour rain event or thaw event has occurred, the Contractor(s) must advise the on-site <strong>Environmental</strong>Manager to conduct sediment <strong>and</strong> erosion control monitoring as described in section 4.2.The action plan presented in Figure 4-4 shall be followed regarding surface water management.Figure 4-3 – Erosion <strong>and</strong> Sediment Control Action Plan4.3 SURFACE WATER RUNOFF MANAGEMENTSurface water runoff management monitoring plan is to be executed by the on-site <strong>Environmental</strong>Manager(s) <strong>and</strong> documented daily in an EIL. The Contractor(s) shall provide a copy of the daily EIL tothe Commission‟s Representative, <strong>and</strong> further discuss all environmental issues as appropriate.Page 28
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanFigure 4-4 – Surface Water Management Action Plan4.4 AQUATIC HABITAT MANAGEMENT4.4.1 Surface Water TemperatureTO BE COMPLETED4.4.2 Aquatic Habitat & Fish ResponsePage 29
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanFigure 4-5 – <strong>South</strong> <strong>Tunnels</strong> Storm Sewer Outfalls MapPage 30
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan4.5 VEGETATION PROTECTIONDuring construction, the condition of the TPZs established around trees shall be monitored by a certifiedarborist twice annually during the growing season <strong>and</strong> periodically year-round for the duration ofdewatering <strong>and</strong> recovery to ensure that they are functioning as designed. Plants found dead duringdewatering <strong>and</strong> recovery will be replaced at an appropriate time of year, i.e., spring or fall.Deficiencies should be reported <strong>and</strong> repaired in a timely fashion. Monitoring of the TPZs should includea provision to ensure the following activities are prohibited within TPZs:Construction activities;Altering of grade by adding fill, excavating, trenching, scraping, dumping, or disturbance of anykind;Storage of construction materials, equipment, soil, construction waste, or debris;Disposal of any liquids (e.g. concrete wash-out, gas, oil, etc.); <strong>and</strong>,Movement of vehicles or machinery.If temporary stockpiling is to be located near a TPZ, appropriate measures as determined by a certifiedarborist shall be installed to ensure no material enters the TPZ.Overall tree health will also be monitored during construction by a certified arborist. This monitoringplan will be similar to the one used to monitor vegetation health in the woodlots <strong>and</strong> natural features.Specific details regarding care <strong>and</strong> maintenance of plant materials, i.e., mulching <strong>and</strong> wateringrequirements, will be included in the L<strong>and</strong>scape Contracts.4.6 WILDLIFE PROTECTION4.6.1 Breeding BirdsIf clearing <strong>and</strong> other construction activities can be planned outside of the breeding bird period, the risk ofencountering nests <strong>and</strong> eggs is greatly reduced. If disruptive activities must occur during the breedingbird period, a detailed nest survey must be undertaken by a qualified biologist. Areas with active nestscannot be disturbed until the young have fledged. Where no active nests are found, disruptive activitiesmay occur only within three (3) days of the survey. The survey must be repeated if the work is to takelonger than three (3) days.All cleared vegetation must be removed immediately from site as birds may nest in the piles <strong>and</strong> preventtheir removal until after the young have fledged.Page 31
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan5. CONSTRUCTION CONTINGENCY PLANSThe following construction contingency plans were developed based on the TYSSE Risk Registrardeveloped by the <strong>TTC</strong>, TRCA <strong>and</strong> their consultants. These contingencies have been developed toaddress unanticipated events that may occur or be encountered during the Project undertaking.Mitigation measures have been developed for many of the contingency items in order to lower thepossibility of situations that may cause delays in the Project schedule.5.1 SPILL RESPONSE PLANA spill is defined in the Ontario EPA as a discharge “into the natural environment, from or out of astructure, vehicle or other container, that is abnormal in quality or quantity in light of all thecircumstances of the discharge”. For the purpose of this EMP, such spills will be identified as majorspills, which must be reported to the MOE immediately. Minor spills can be expected on anyconstruction site, but do not need to be reported to the MOE <strong>and</strong> are to be mitigated <strong>and</strong> prevented.This Spill Response Plan presents a detailed response system to deal with events such as the releaseof petroleum, oils <strong>and</strong> lubricants or other hazardous liquids <strong>and</strong> chemicals, classified either as major orminor spills. The objectives of the Plan are to minimize:Danger to persons <strong>and</strong> adverse health effects;Safety risk;Impairment to the quality of the natural environment (air, water or l<strong>and</strong>);Extent of affected area;Degree of temporary disturbance to the natural environment during work activities; <strong>and</strong>,Injury or damage to property or animal life.To reduce the likelihood of an event involving a spill or leak, the following procedures shall be followed:All water control devices <strong>and</strong> hoses shall be inspected every five (5) hours <strong>and</strong> monitored toensure proper working order;All hoses <strong>and</strong> connections on equipment will be inspected routinely by truck operators for leaks<strong>and</strong> drips;All equipment <strong>and</strong> vehicle leaks must be reported immediately to the Contractor <strong>and</strong> repaired priorto continued use;All material storage areas shall be inspected every five(5) hours for signs of spills, generalhousekeeping, state of spill containment units <strong>and</strong> features, <strong>and</strong> availability of appropriate spillcontrol supplies;Automatic closures shall be used on all jerry cans;Vehicles <strong>and</strong> equipment will be stored at designated areas a minimum of 30m from a watercourse;Vehicle maintenance will be enhanced <strong>and</strong> good housekeeping practices will be implemented; <strong>and</strong>,Water tight trucks or lined truck beds will be used to transport wet excavated material <strong>and</strong> debristhat may otherwise leak.Spill response kits (SRK) shall be maintained in areas that are accessible to all site personnel <strong>and</strong> shallcontain materials capable of containing <strong>and</strong> disposing of any spilled material that could occur during thecourse of the Project undertaking. The SRK must contain the following spill response resources in orderto respond to accidental releases of fuels <strong>and</strong>/or hazardous materials.EIL form <strong>and</strong> waterproof Emergency Contact Information sheet;Absorbent materials (e.g., sorbent pads, Sorb-All, vermiculite);Small h<strong>and</strong> equipment (e.g. shovels, tool kit, sledgehammer, buckets, tarpaulins, one empty drum;Appropriate PPE;Containment boom; <strong>and</strong>,Fire extinguishers.5.1.1 Minor SpillsMinor spills are spills of materials within the limits set out in the Transportation of Dangerous Goods Act<strong>and</strong> the Classification <strong>and</strong> Exemption of Spills Regulation (O. Reg. 675/98) (CESR), as provided inTable 5-1, which do not need to be reported to regulatory agencies. Note that spill reportingexemption limits do not apply if the spilled material has entered or is adjacent to a watercourseor water body, if the spill has crossed over to an adjacent property, or if a spill has occurred neara structure that connects to a watercourse or water body. Any such spills must be treated as amajor spill.In addition to the release of small quantities of materials (i.e. release less than the quantity identified inTable 5-2, Section 5.1.2), the following are considered minor spills, according the rules set out in theCESR:Table 5-1 – Minor Non-Reportable Spills under Classification <strong>and</strong> Exemption of Spills RegulationItem No. Class Description of Contaminant1. i Discharges under a Certificate of Approval, order, license or other approval,provided the discharge is in compliance with all legislation, includingmunicipal by-laws2. Ii Discharges of water from a reservoir caused by a natural event, <strong>and</strong>discharges of potable water from water mainsQuantitySpilled3. Iii Combustion products from household fires NA4. Iv Planned spills <strong>and</strong> pre-authorized discharges (adverse effects must bemonitored <strong>and</strong> report filed within five days)5. v Spills of refrigerants governed by the Refrigerants Regulation (O. Reg.189/94) – there must be no adverse effects <strong>and</strong> records must be kept5.1.2 Major SpillsMajor spills must be reported to the MOE immediately <strong>and</strong> other stakeholders that may be impacted bythe spill (as noted in the following paragraphs). Any spills to or adjacent to a watercourse or near astructure that connects to a watercourse must also be reported to the TRCA <strong>and</strong> DFO as per theFederal Fisheries Act. In addition to the limits outlined below, a spill of the substances listed in Table 5-2must be reported if the spill could pose a danger to public safety or the spilled substance enters awatercourse or water body, or onto an adjacent property. The spills in excess of the following quantitiesqualify as a major spill according to the CESR <strong>and</strong> the TDGA:NANANANAPage 32
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanItemNo.Table 5-2 – Reportable Spill Exemption LimitsClass Description of Contaminant Quantity SpilledTransportation of Dangerous Goods Act1. 1 Explosives >50kg2. 2 Gases >10minutes3. 3 Flammable Liquids >200L4. 4 Flammable solids <strong>and</strong> substances liable to spontaneous combustion, waterreactive substances>25kg5. 5.1 Oxidising Substances >50kg or 50L6. 5.2 Organic peroxides >1kg or 1L7. 6.1 Toxic Substances >5kg or 5L8. 6.2 Infections Substances >1kg or 1L9. 7 Radioactive Materials NOTE (1)10. 8 Corrosives >5kg or 5L11. 9 Miscellaneous Products, Substances or Organisms >25kg or 25LClassification <strong>and</strong> Exemption of Spills Regulation (O. Regulation 675/98)12. vi Fluid, other than from cargo, from fuel or other operating systems or motorvehicles13. vii Mineral oil, other than PCB liquid, from transformers owned by municipal orprovincial utilities14. viii Petroleum product from bulk plant, marina or private or retail outlet (if area isrestricted from public access)15. viii Petroleum product from bulk plant, marina or private or retail outlet (if area ispublicly accessible)>100L>100L>100L16. x Materials itemized in site-specific spill contingency plan > volumespecified incontingency plan(1) Any quantity that could pose a danger to public safety <strong>and</strong> an emission level greater than the emission level established in Section20 of the “Packaging <strong>and</strong> Transport of Nuclear Substances Regulation”According to the contract documents, the Contractor is responsible <strong>and</strong> liable for all testing,documentation, clean-up, reporting, repairs, removal, damages <strong>and</strong> associated costs <strong>and</strong> all otheractions arising from a major spill that resulted from Contractor(s) operations. To help mitigate potentialimpacts, the Contractor(s) must maintain a SRK that is capable of disposing of any spill that could occurduring the course of the Project.In the event of a major spill, the Contractor(s) shall immediately communicate the details of the spill,including the type of spill, the quantity of the material spilled, the exact location of the spill <strong>and</strong> whetherthe contaminant has entered any sewer line or floor drain or if the spill has occurred on unpaved ground,to:The Commission‟s representativeMOE Spills Action Centre;The TRCA <strong>and</strong> DFO (if spill is a threat to or has entered a watercourse);>25LThe municipality within the boundaries of which the spill has occurred, including municipal <strong>and</strong>regional governments; <strong>and</strong>,The local fire department <strong>and</strong> police department (if the spill has entered a waterway, neighbouringproperty or public space (i.e. roadway).Table 5-3 provides the contact information for the parties that may need to be contacted in the event ofa major spill.Table 5-3 – Major Spill Contingency ContactsContactContact NumberMOE Spills Action Centre 1-800-268-6060TRCA 416-338-8888DFO 613-993-0999City of Vaughan, Public Works Dept. 905-832-8562City of Toronto, Toronto Water 311City of Toronto Fire Department 416-338-9050 (911)Toronto Police Department 416-808-2222 (911)In the event of a spill to a water course or water body, the Contractor shall work with the authorities incoordinating a clean-up, which will include the following actions, where appropriate:Deploy appropriately trained on-site personnel to contain the spilled material using absorbentmaterial or booms, as appropriate;Assess site conditions <strong>and</strong> environmental impact of various clean-up procedures;Choose <strong>and</strong> implement an appropriate clean-up procedure;Deploy on-site personnel to mobilize pumps <strong>and</strong> empty drums, or other appropriate storage, to thespill site;Apply absorbents as necessary;Remove any contaminated sediment/soil as required;Dispose of all contaminated debris, water, soil, cleaning materials <strong>and</strong> absorbents generated bythe clean-up operation to approved disposal site; <strong>and</strong>,Take all necessary precautions to ensure that the incident does not reoccur.5.1.3 General Spill Response ProtocolsSpill response measures must be implemented quickly to limit the level of impact on the environment<strong>and</strong> the work site; however, health <strong>and</strong> safety must be considered as the top priority when dealing withspills. As such, in the event that a spilled material presents immediate danger to health <strong>and</strong> safety, allworkers shall be evacuated from the area until a full spill cleanup plan is developed. Similarly, if theworker who discovers the spill is unaware of the properties of the substance that has leaked or spilled,the worker shall immediately vacate the immediate area of the spill <strong>and</strong> notify their direct supervisor,who shall investigate the incident.Page 33
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanIn st<strong>and</strong>ard spill situations, where there is no immediate threat to worker health <strong>and</strong> safety, upon thediscovery of the spill, the Contractor shall implement the following measures to mitigate the potentialimpacts of the spill:Obtain proper PPE <strong>and</strong> appropriate spill cleanup equipment (maintained at the material stagingarea <strong>and</strong> in any other area where hazardous liquids are h<strong>and</strong>led or stored) to h<strong>and</strong>le the spilledmaterial;Immediately cease that activity causing the spill, if possible;Take appropriate action without unnecessary delay;Cordon off or delineate the spill from the surrounding area (i.e. caution tape, signs or pylons);Repair punctures or broken pipelines immediately (either temporarily or permanently) <strong>and</strong>/orimplement other spill control measures;Block any potential passageways to the excavation, creeks, drainage ditches, or catch basins;Proceed to clean up the spill in accordance with the applicable legislation or retain an outside spillcompany to contain <strong>and</strong> clean the spill, if necessary;Contact the Commission‟s Representative immediately <strong>and</strong> indicate whether the spill will impactProject construction activities, if the spill cannot be cleaned using on-site resources, or if the spilloccurred in an unpaved area where potential impacts to underlying soil may have occurred;Document all spills in an EIL including details with respect to the material spilled, volume, location,underlying material, clean-up required, materials used <strong>and</strong> any potential environmental impacts ofthe spill; <strong>and</strong>,Submit the EIL to the Commission‟s Representative forthwith, along with a mitigative measuresprogram. If the issue is not resolved in a reasonable period of time, as per the mitigative measuresprogram developed by the Contractor, the Commission‟s Representative will take appropriateaction.If spill has occurred on a roadway, the Contractor(s) shall wait for police or fire department <strong>and</strong> do nottry to redirect the flow of traffic around the spill or attempt to contain or clean the spill unless:The spill poses an immediate safety concern to the public or may cause immediate or acuteenvironmental impact if not promptly contained or cleaned;All necessary equipment for safely directing traffic is available (i.e. pylons, safety vests, h<strong>and</strong>-held“stop”/”slow” signs);Someone is present who is trained in traffic control; <strong>and</strong>,A minimum of two people are available to direct traffic.5.2 SEVERE WEATHERThe Project work site must be maintained at all times such that materials are contained during regularlyforeseeable weather conditions. Additional protocols must be implemented if greater than one-in-ten orone-in one-hundred year storms are forecasted. The potential impacts, preparation requirements, <strong>and</strong>response procedures for floods <strong>and</strong> severe weather are described below.Flooding of work site could result from a failure of the dewatering program or a heavy rainfall event.Flooding has the potential to seriously disrupt work activities, endanger the safely of on-site workers,<strong>and</strong> could cause delays for clean-up activities to take place. Extreme water flows from heavy rainfallmay also result in localized erosion of excavation embankments, carrying sediment-laden water into thework area.All appropriate precautions shall be taken by Contractors to ensure that in the event of severe weather,the integrity of the Project <strong>and</strong> the safety of the workers will be maintained. These precautions include:Ensuring that sufficient pump capacity is available to direct water flows away from the excavation<strong>and</strong> tunnels, both in the excavation <strong>and</strong> storm water management ponds;Monitoring the weather forecast for the area to identify signs of severe weather from which floodingcould result;Maintaining emergency st<strong>and</strong>-by pumps that will be able to mitigate, to the greatest extentpossible, any interference with construction works in the excavation as a result of flooding; <strong>and</strong>,Storing all equipment <strong>and</strong> products away from active work areas <strong>and</strong> the excavation to preventshifting <strong>and</strong> associated environmental consequences in the event of flooding.In flood conditions, the subsequent procedures shall be followed:On-site activities shall be temporarily ceased <strong>and</strong> active work areas shall be covered or protectedfrom potential flow pathways using temporary berms. Emergency st<strong>and</strong>-by pumps shall be placedwithin the excavation <strong>and</strong> activated in advance of a potential flooding event where possible toprevent accumulation of water within the excavation;If flooding occurs in the excavation, water remaining in the excavation after the event that causedthe flooding shall be pumped <strong>and</strong> collected in ASTs or other suitable containment device fortreatment, as directed by the Commission‟s Representative;If flooding occurs or is imminent, all workers shall vacate potentially hazardous site areas, meetingin a safe area established by the Contractor(s);Any harmful environmental effects resulting from flooding shall be assessed <strong>and</strong> if required, arestoration plan will be developed by the Contractor <strong>and</strong> reviewed by the Commission‟sRepresentative. A thorough investigation of structural integrity of the work area(s) shall also beconducted by the Commission‟s Representative in the event of a flood. Any spill of contaminatedmaterial shall be reported according to Section 4.1.2; <strong>and</strong>,All incidents are to be reported to the Commission‟s Representative.5.3 DEWATERING MALFUNCTIONIt is possible that during construction pump failure may occur, resulting in dewatering malfunction. Pumpfailure could be a result of groundwater flows in excess of pump capacity, a mechanical failure within thepumping system or loss of power. The following outlines the procedures to be taken should this occur:Cease <strong>and</strong> desist all construction activities that are affected by dewatering;Check that power is being supplied to pumps;Check that pumps are in working order;Check water levels in nearby monitoring wells to determine if water entering the area is comingfrom an unexpected source;If water is being obtained from unexpected source, contact hydrogeologist to conduct study todetermine where the ground water is migrating from;If malfunction is due by failure of emergency generator set or mechanical failure of pump, installreplacement equipment;If malfunction is due to increased water, install additional pumps for dewatering; <strong>and</strong>,Construction is to resume when required water level has been met.Page 34
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management Plan5.4 CONTAMINATED GROUNDWATER INTO EXCAVATIONDuring construction, it is possible that contaminated water may enter the excavation. This water maycome from a number of places, such as: construction site/surface runoff, groundwater infiltration,tunnelling spoils, <strong>and</strong> construction operations. The main sources of contamination are typically fuel <strong>and</strong>lubricants spills, contaminated soils, or contaminated groundwater drawn into the dewatering system.All water pumped from the excavations should pass through the on-site water treatment facility beforebeing discharged; however, the system may not be designed to treat the unknown contaminants.In the event that the contamination level causes the water discharging the treatment system to exceedthe applicable criteria, the following steps should be taken:Cease <strong>and</strong> desist discharge of water. Contain water within storage tanks or remove from the sitefor treatment;Inspect the treatment system to ensure that the decrease in water quality is not due to equipmentmalfunction. If malfunction is the cause, repair the system <strong>and</strong> test to verify proper working orderbefore continuing discharge. Resume sampling as per Section 4.1;If decrease in quality is not due to malfunction, analyze inlet water for contaminants of concern. Ifconcentrations are elevated or exceed discharge criteria, adjust the efficiency of the treatmentsystem to meet the acceptable discharge limits. This may include installation of an additionalsystem in series or the provision of sending the water to be treated off-site; <strong>and</strong>,Discharge can resume only once discharge quality meets accepted discharge criteria.In the event that the quantity of water from the excavation exceeds the capacity of the treatment system,the following steps should be taken:Contain excess untreated water within storage tanks;Increase treatment capacity including the installation of a secondary treatment system or additionalprimary units <strong>and</strong> to accommodate excess water; <strong>and</strong>,Ensure that the discharge quantity is not exceeded. Quantities above the discharge limits mayneed to be treated off site.In the event that the quantity of water accumulating in the excavation exceeds the capacity of the pumps<strong>and</strong> back-up pumps, the following steps should be taken:Ensure that adequate power is being provided to the pumps;Check that all pumps are in working order;If the pumps are malfunctioning due to failure of emergency generator set or mechanical failure ofpump, install replacement equipment; <strong>and</strong>,If the existing pumps are in working order, install additional pumps to accommodate the excesswater.Inspect surface water <strong>and</strong> sedimentation control measures to ensure functionality <strong>and</strong> repair anydeficiencies;Implement additional sedimentation <strong>and</strong> surface water control measures as approved by theCommission‟s Representative;If the water does will not meet the desired temperature while flowing through the collection systemeither an aeration system will need to be installed within the receiving body of water, or water is tobe discharged across an open field area at least 30m away from a watercourse. By utilizing one ofthese two methods, the temperature should adjust to the appropriate temperature. The aerationsystem will distribute the water across a greater area decreasing the effect of the warmertemperature; <strong>and</strong>,Resume regular or modified operation of storm water management only after an appropriatesolution has been implemented.5.5 HANDLING, TREATMENT AND DISPOSAL OF SURFACE WATER ISSUESProactive mitigation <strong>and</strong> monitoring has been outlined for the h<strong>and</strong>ling of surface water. If storm waterdischarges exceed the applicable criteria (including temperature) at the respective discharge point (i.e.at storm sewer or storm outlet):If possible, prevent further discharge of water from surface water control measures to the stormsewer or outlet <strong>and</strong> contain surface water;Page 35
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanAPPENDIX AENVIRONMENTAL INSPECTION LOGPage 36
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanAppendix A<strong>Environmental</strong> Inspection LogDate (D/M/Y):_______________________________________ Time (24hrs):_________________________Weather Conditions: _____________________________________________________________________________Construction Status: _____________________________________________________________________________Inspection Log Completed by (printed name <strong>and</strong> signature):_____________________________________________________________________________________________CHECKLIST ITEM: ACCEPTABLE 1 NOT ACCEPTABLE 1 * NOT APPLICABLE1. Sediment Control StructuresHeavy Duty Silt Fences Jersey Barriers with Silt Fence Staked Sediment Control Logs Truck Wash Mud Mat Concrete Wash-Out <strong>Station</strong> Storm Drain Inlet Protection Sediment Traps Temporary Rock Flow Check Dams Other 8. DewateringDischarge Quality Discharge Filters/Treatment System Groundwater Level (excavations) Groundwater Level (ecological) 9. <strong>Environmental</strong> Monitoring ActivitiesSurface Water Aquatic Environment Terrestrial Health 12. Other 13. Other (Append additional pages if necessary)1Criteria for Acceptable <strong>and</strong> Not Acceptable for each checklist item are given on Pages 3 to 7.* Where a checklist item is not acceptable, comments must be provided below detailing: the nature of the concern; the extent of any environmental impacts; the remediationmeasures undertaken; the requirement for any further remediation measures; if notification of a regulatory body was required, <strong>and</strong> if so, the response; any recommendations forimprovements/follow-up; <strong>and</strong> any other relevant information.COMMENTS:Page 37
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanCriteria to Determine if Mitigation Effectiveness is Acceptable or Not Acceptable1. Sediment Control Structures:a. Acceptable:i. During visual inspection, the sediment control structures are intact, with no gaps, tears, slumping orweathering of the materials <strong>and</strong> no noticeable impact in the receiving water “downstream” of thesediment control structures.ii. During visual inspection, the reading/measurement is less than the specified Trigger Level asindicated in the table below.b. Not Acceptable:i. During visual inspection, the sediment control structures are not intact, with gaps, tears, slumping orweathering of the materials <strong>and</strong> noticeable impact in the receiving water “downstream” of thesediment control structuresii. During visual inspection, the reading/measurement is greater than or equal to the Trigger Level asindicated in the table below. Remediation must be preformed within 24 hours of this inspection.iii. If the reading/measurement is greater than or equal to the Action Level as indicated in the tablebelow, work must halted <strong>and</strong> repairs to the sediment control structures must be preformedimmediately.Measure Trigger Level Action LevelHeavy Duty Silt Fence 30% full 50% fullJersey Barrier with Silt Fence 30% full 50% fullStaked Sediment Control Log 30% of height 50% of heightTruck WashAs specified by ManufacturerO&M ManualAs specified byManufacturer O&M ManualMud Mat 50% coverage 75% coverageConcrete Wash-out <strong>Station</strong> 30% full 50% fullInlet Sediment Control Device 15% full 30% fullSediment Trap 15% full 30% fullTemporary Rock Check Dam 15% full 30% fullSediment Control Pond 15% full 30% fullErosion Control Blanket 30% full 50% fullMulch 85% coverage
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanAPPENDIX BWEEKLY SUMMARY REPORTPage 39
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanWeekly Summary ReportWeek Ending (D/M/Y):_______________________________Construction Status:_____________________________________________________________________________Completed by (printed name <strong>and</strong> signature):__________________________________________________________(Append additional pages if necessary)Were any elements found to be “Not Acceptable” according to the criteria of the <strong>Environmental</strong> Inspection Log (EIL) for theweek ending indicated above? Yes NoIf yes, list below:ITEM 1 : Issue Identified Mitigative Measure ImplementedFollow-upReportReceived?(Y/N)1 List of items identified for inspection on EIL is provided on following page2 Commission’s Representative shall indicate whether the Contractor has completed a follow-up report regarding the incident. Follow-upreports shall be appended to the weekly summary if possible or forwarded to the <strong>TTC</strong> when received.COMMENTS:Page 40
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanAPPENDIX CINCIDENT FOLLOW-UP REPORTPage 41
Toronto-York Spadina Subway Extension Project<strong>South</strong> <strong>Tunnels</strong> <strong>and</strong> <strong>Sheppard</strong> <strong>West</strong> <strong>Station</strong> <strong>Environmental</strong> Management PlanIncident Follow-up ReportDate of Report (D/M/Y):________________________Incident initially reported by:NameDate of Incident (D/M/Y):_______________________CompanyFollow-up Report Completed by:Name Company SignatureIndicate the type of incident below (note that a separate follow-up report must be completed for each incident identified – check oneonly):Incident Type Location1. Sediment Control Structures 2. Stabilization Areas 3. General Noise Control Measures 4. General Air Quality Control Measures 5. Dewatering 6. <strong>Environmental</strong> Monitoring Activities 7. Access Roads 8. Other Cause/Nature of Incident:Mitigative Measures Implemented:Current Status <strong>and</strong> Ongoing Monitoring:(Append additional pages if necessary)Follow-up report reviewed by ________________________ (company name) on _________________ (D/M/Y)