This is a service / maintenance or supply contract in Durham, Ontario. Contact the soliciting agency for additional information.

The SVCA is looking to retain the services of a qualified consulting engineering firm to complete a Class Environmental Assessment (Class EA) for the Durham Upper Dam and Dike. The Class EA shall be completed in accordance with the Class Environmental Assessment for Remedial Flood and Erosion Control Projects (Conservation Ontario, Amended February 2024). The goal of the Class EA is to develop and assess a range of alternatives and select a preferred alternative that will address the primary challenges at the site, which include operational issues associated with removal of stoplogs and flashboards under ice conditions, managing frazil ice to prevent downstream ice jams and flooding in the Town of Durham, and the condition of the concrete dam and steel truss bridge structure. Due to the timing of funding availability, the SVCA and West Grey have determined that the Class EA should be broken down into three phases, including: Phase 1: Dam Safety Assessment Update. Phase 2: Baseline Environmental Inventory and Frazil Ice Mitigation Plan Phase 3: Development and Evaluation of Alternatives, a Preferred Solution and Consultation. Phase 1 of the Class EA was completed by D.M. Wills Associates Limited in April 2024. This work involved the development of hydrologic (HEC-HMS) and hydraulic (2D HEC-RAS) models (developed in conjunction with the Durham Creek Flood Hazard Mapping Project), a dam break and incremental loss assessment, the selection of the Hazard Potential Classification and Inflow Design Flood, a hydraulic capacity and freeboard assessment, and a preliminary gravity dam stability assessment. The probable maximum flood (742.1 m3/s) was considered as the inflow design flood (IDF) for the above models. In the model, the hydraulic capacity for the IDF reaches a headwater elevation of 352.38 m. The IDF spills overland to the north of the dam and overtops the flood dike and concrete dam both with and without stoplogs installed and was therefore determined to not have the hydraulic capacity to convey the IDF. A freeboard analysis was carried out and was determined to have an available freeboard of 2.01 m under normal conditions and -0.59 m under the IDF scenario. The hazard potential classification for the dam and dike was Very High. This report will be provided to the successful consultant. The SVCA is planning to retain one consulting project team to complete Phases 2 and 3 of the Class EA. Phase 3 of the Class EA will be initiated upon successful completion of Phase 2. Additionally, the initiation of Phase 3 is subject to the approval of the SVCA and West Grey and will be contingent on the receipt of funding to complete the project. The SVCA is looking to retain the services of a qualified consulting engineering firm to complete a Class Environmental Assessment (Class EA) for the Durham Upper Dam and Dike. The Class EA shall be completed in accordance with the Class Environmental Assessment for Remedial Flood and Erosion Control Projects (Conservation Ontario, Amended February 2024). The goal of the Class EA is to develop and assess a range of alternatives and select a preferred alternative that will address the primary challenges at the site, which include operational issues associated with removal of stoplogs and flashboards under ice conditions, managing frazil ice to prevent downstream ice jams and flooding in the Town of Durham, and the condition of the concrete dam and steel truss bridge structure. Due to the timing of funding availability, the SVCA and West Grey have determined that the Class EA should be broken down into three phases, including: Phase 1: Dam Safety Assessment Update. Phase 2: Baseline Environmental Inventory and Frazil Ice Mitigation Plan Phase 3: Development and Evaluation of Alternatives, a Preferred Solution and Consultation. Phase 1 of the Class EA was completed by D.M. Wills Associates Limited in April 2024. This work involved the development of hydrologic (HEC-HMS) and hydraulic (2D HEC-RAS) models (developed in conjunction with the Durham Creek Flood Hazard Mapping Project), a dam break and incremental loss assessment, the selection of the Hazard Potential Classification and Inflow Design Flood, a hydraulic capacity and freeboard assessment, and a preliminary gravity dam stability assessment. The probable maximum flood (742.1 m3/s) was considered as the inflow design flood (IDF) for the above models. In the model, the hydraulic capacity for the IDF reaches a headwater elevation of 352.38 m. The IDF spills overland to the north of the dam and overtops the flood dike and concrete dam both with and without stoplogs installed and was therefore determined to not have the hydraulic capacity to convey the IDF. A freeboard analysis was carried out and was determined to have an available freeboard of 2.01 m under normal conditions and -0.59 m under the IDF scenario. The hazard potential classification for the dam and dike was Very High. This report will be provided to the successful consultant. The SVCA is planning to retain one consulting project team to complete Phases 2 and 3 of the Class EA. Phase 3 of the Class EA will be initiated upon successful completion of Phase 2. Additionally, the initiation of Phase 3 is subject to the approval of the SVCA and West Grey and will be contingent on the receipt of funding to complete the project. 2.2 RFP Deliverables The following deliverables must be provided as part of Phase 2 of the Class EA: Agenda and minutes for all meetings (2) Background Review and Data Gap Assessment Memo Draft and Final Baseline Environmental Inventory Reports, including copies of the following as appendices: Topographic and Bathymetric Survey Any provisional items to be completed as part of Phase 2 as approved by SVCA and West Grey (listed below). Frazil Ice Mitigation Strategy Report The following deliverables may be provisionally provided as part of Phase 2 pending funding and approval by SVCA and West Grey. If not approved during Phase 2, these deliverables may be shifted to Phase 3 of the Class EA. Further baseline environmental inventory reports as provisional appendices: Dam Inspection Report Geotechnical Engineering Field Investigation Report Stage 1 Archaeological Assessment Report Natural Environment Existing Conditions Report The following deliverables must be provided as part of Phase 3 of the Class EA: Agenda and minutes for all meetings (3). Completion of remaining baseline environmental inventory provision items as approved by SVCA and West Grey and associated reports. All notices required under the Class EA, including the Notice of Intent, Notice of Completion of the Project Plan / Environmental Study Report, Notice of PIC, and Notice of Project Completion. All materials required for the Public Information Centre (PIC), including the display boards, sign-in sheet, comment sheets, and handouts. Draft and Final Alternative Development Reports, including appendices with conceptual design drawings, conceptual cost estimates, life cycle cost assessments, hydraulic analyses, structural analyses, and geotechnical analyses. Draft and Final Alternative Evaluation Reports, including and appendix with the evaluation matrix and criteria. Draft and Final Project Plan or Environmental Study Report, including appendices with details of the public/agency consultation, and conceptual design drawings and cost estimates for the preferred alternative. All draft, final reports, and data collected while conducting the Durham Upper Dam Phase 2 and 3, is to be provided to SVCA in an electronic form suitable to SVCA staff. The SVCA will share this information with West Grey staff. All final reports must be AODA compliant. Question Deadline Date: 10/21/2025 12:00:00 PM ET The method of Contractor Selection has not been Determined at this time. Value Range 75,001 ~ 100,000 $ *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document.