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model info shall be used for critical elevations and information in Phase 1; a ground survey <br /> basemap will be completed in Phase 2. <br /> Deliverables: <br /> • Preliminary basemap file (pdf) <br /> 240- Evaluation of Previously Modeled CSO Control Volume and System Operations <br /> Assumptions: <br /> The following is a brief description of the operating strategy for the City's preferred concept for <br /> the wet weather and CSO flow handling: <br /> 1. Normal dry weather and modest wet weather flow: At 36th St Regulator, flow goes north <br /> and continues in the Summit Interceptor. Weir heights should prevent flow from <br /> continuing east to the SRI (72") and prevent flow from going to the CSO storage. <br /> 2. Wet weather flow: At 36th St. Regulator, flow continues north in Summit Interceptor, <br /> but is allowed to go over the weir and flow east to the SRI (72"). Flow should not be <br /> going to CSO storage yet. The HGL at the SR08 regulator should remain below the <br /> setpoint that triggers the slide gate to open and become a CSO event. <br /> 3. More wet weather flow: When the HGL at the SR08 regulator is close to opening the <br /> slide gate, flow should enter the CSO storage vault and continue to accumulate there <br /> and maintain the HGL at the SR08 regulator below the slide gate opening setpoint. <br /> 4. More wet weather flow: When the CSO storage is filled, and the HGL at the SR08 <br /> regulator reaches the setpoint, the slide gate would open sufficiently to maintain the <br /> HGL near the setpoint level. <br /> In summary: <br /> 1. The Summit Interceptor should continue to carry as much flow as possible and no flow <br /> to SRI (72") nor to CSO storage. <br /> 2. The SRI (72") should be utilized to carry as much flow as possible without causing a CSO <br /> at SR08 and without accumulating flow in CSO storage. <br /> 3. The CSO storage vault and SRI (72") shall be utilized to handle as much flow as possible <br /> without causing SSOs or CSOs anywhere in the system. <br /> 4. The SR08 regulator (slide gate) can open when the CSO vault is full and the SRI (72") is <br /> at maximum capacity. <br /> The Consultant shall perform the following: <br /> a. Review sewer flow monitor data (.csv files) in six(6) locations and for 6-month <br /> time period <br /> b. Review storm events (precipitation) used to size conveyance infrastructure (24 <br /> hour,Type 1A design storm) and storage facility (69 series storm with 24th largest <br /> 7IPage <br />