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Stantec Consulting Services Inc. 10 of 16 <br />TO1 – Randolph-Sampson RTB PER <br />Subtask 3.3- Flow Monitoring <br />Based on the updated H&H model, STANTEC will identify up to six (6) locations in the CSO 022 basin for <br />installation of temporary flow monitors to collect data for model validation. Stantec will also identify <br />locations for the installation of two (2) temporary rain gauges. The flow monitors are to be installed for <br />four (4) months to provide for collection of data from mid-summer through fall. Flow data to be <br />collected will include depth, velocity and flow rates in 5-minute increments organized in Excel format. <br />Results from the flow monitoring program will be documented in a technical memorandum that <br />includes information on the characteristics of the observed storm events as well as summary data, and <br />level, velocity, and flow charts. <br />STANTEC may terminate the flow monitoring program earlier if STANTEC determines sufficient data has <br />been collected. STANTEC understands that the CITY may have staff and equipment available to conduct <br />the proposed flow monitoring. However, for the purpose of this agreement, it is assumed that flow <br />monitoring services will be provided by STANTEC’s subconsultant. If, based on discussions at the Kickoff <br />Meeting or another early progress meeting, it is determined that the CITY can conduct the required flow <br />monitoring, the cost for subconsultant flow monitoring will be eliminated from the project budget. <br />Subtask 3.4 - H&H Model Calibration and Validation <br />STANTEC will use results from the analysis of historic flow data and flow monitoring tasks to validate and <br />confirm the reasonableness of the updated H&H model. Validation analyses will be performed for up to <br />four (4) events selected to represent a range of potential operating conditions for the proposed RTB. <br />Comparisons between the observed rainfall and flow data and model-predicted conditions will be <br />documented in a technical memorandum along with observations regarding the use of the model for <br />performance of RTB design analyses. <br />Deliverables for Task 3 (All deliverables will be submitted via email in PDF format unless otherwise <br />noted): <br />• Technical Memorandum: Flow Monitoring Report and Data in Excel. <br />• Technical Memorandum: H&H Model Update and Validation Report. <br /> <br />Task 4 – Conceptual Design of Improvement Elements <br />Under this task, alternatives for the proposed RTB and related improvements will be developed, <br />evaluated, and selected to achieve the performance criteria defined in the LTCP Table-1. The schematic <br />of the proposed Randolph-Sampson RTB included in the LTCP (shown below) will be used as a starting <br />point for the evaluation but may be modified to consider new information from Tasks 2 and 3. Based on <br />the evaluation, STANTEC will develop and document a conceptual design and related design criteria for <br />the proposed RTB, prepare a Class 5 opinion of probable construction cost (OPCC) in accordance with <br />Association for the Advancement of Cost Engineering (AACE) International guidelines, and generate <br />estimates of annual operation and maintenance (O&M) costs for the facility.