PSA - Long-Termed Control Plan Stantec Consulting Services

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Stantec Consulting Services Inc. 11 of 16 TO1 – Randolph-Sampson RTB PER Subtask 4.1- Hydraulic Design The hydraulic design analysis for the improvements will determine the following key design criteria: • Flow diversion structure (overflow structure to RTB) hydraulic control approach and parameters. • RTB influent and effluent conduits/junction chamber size and configuration. • RTB storage size and flow/level control approach and parameters. • Recommended CSO 022 regulator hydraulic modifications. • Active monitoring and throttle control approach and setting to prevent overflows at CSO 48 near River Crossing #1. It is assumed this will include an active gate control and require connection to the City’s control system. As part of this scope, STANTEC will also define key hydraulic design criteria for the regulators/throttles upstream of the East Race at CSOs 014, 018, 021, 040. STANTEC will evaluate the alternatives using the updated H&H model against the LTCP “Typical Year Performance Criteria”, i.e., no more than 9 CSO Discharges during the typical year rainfall. Model simulations will also be conducted for the alternatives with up to three (3) design storms (1-year, 5-year and 10-year). The purpose of design storm simulation is to understand the hydraulic profiles in the system and assess the risk of undesirable surcharge conditions. Results of the hydraulic design analyses will be reviewed in a hydraulics workshop during which computational fluid dynamics (CFD) modeling specialists will review and comment on proposed hydraulic design criteria for the facilities at the Randolph Sampson site. Comments will be considered in