The RfP and all addenda will be posted on the Quinte Conservation website at http://quinteconservation.ca/site/index.php?option=com_content&task=view&id=27&Itemid=41
Quinte Conservation is requesting a dam safety review update be completed for the McLeod Dam. The review will be completed in accordance with the Dam Safety Reviews Best Management Practices (OMNR, 2011). It is anticipated that the work will include all the components of a dam safety review.
Based on the outcome of the preliminary dam classification that will be completed as part of this exercise, a determination will be made of the Inflow Design Flood (IDF) for the structure. The previous DSR identified the 1:100 year regulatory storm as an appropriate IDF for the McLeod Dam, and that dam break flows for both normal and IDF flow would remain within the existing Moira River channel. Should a more infrequent return frequency be determined as the inflow design flood, the hydrologic analysis to determine the inflow hydrograph will be carried out as part of this study.
If the IDF is determined to be the regional flood event, the hydrologic calculations of the former designs will be confirmed or updated based on longer term outflow data for the Moira River at Foxboro (Water Survey of Canada station no. 02HL001, 1915 – present).
Depending on the outcome of the classification of the dam, a dam break analysis may be warranted and is to be completed as part of this study. The consultant will include a contingency item for this eventuality.
Frequency analysis, regional frequency analysis, hydrologic modelling, flood routing and hydraulic analyses shall be in accordance with the Technical Guide – River and Stream Systems: Flooding Hazard Limits, (OMNR, 2002).
Undertake an evidence based or conservative stability analysis of the structure to determine if dam safety criteria are satisfied. A seismicity assessment should also be included. If the structure does not meet stability requirements using conservative assumptions, concrete and geotechnical testing should be completed to confirm condition and material properties. A contingency item should be included for destructive and non-destructive testing.
A Public Safety Assessment (PSA) is to be completed to identify potential public safety hazards. The PSA is to be completed in accordance with the Public Safety Around Dams Best Management Practices (OMNR, 2011). A recommendation should be made as to whether a Public Safety Plan should be completed. Provide a contingency for completion of a Public Safety Plan in the proposal.
Undertake an inspection of the structure and ice booms. Complete a survey of the embankment. Recommend actions and maintenance activities including a timeline for completion and estimated budget. Provide the expectant lifespan of the structure.
Investigate and determine the source and pathway of the seepage. Develop a seepage monitoring plan for Quinte Conservation to continue to assess the seepage over time. Identify any imminent or future risks attributed to the seepage and recommend rehabilitation methods, costs and timeframes.
MNRF 2011 Technical Bulletins should be followed for all aspects of the project scope.
