Murraysmith Inc. 4/12/2021 - Laserfiche WebLink

Work Tasks 4.1 Flow Monitoring Data Review existing flow monitoring data and identify potential new flow monitoring locations, if necessary. Existing data to be utilized as appropriate. Develop and submit a Flow Monitoring Plan for City review and approval. ADS to perform flow monitoring in accordance with the Flow Monitoring Plan. Assume up to 29 locations to be installed. ADS to provide finalized data to Murraysmith for use in I/I analysis and flow monitoring at the end of the agreed upon monitoring period. It is anticipated that flow monitoring to take place in both the combined and separated systems. 4.2 Current and Future Wastewater Flow Projections Review population and flow projections including those documented in the City's 2020 Comprehensive Water Plan, WPCF Plan, and PGSF Plan. City to identify and provide areas of growth in the study area. Document existing and future population and employment numbers in the service area and for the planning horizons. Utilize available flow monitoring data, water meter consumption data, and other sources to characterize wastewater flows for the existing system including: ■ Average Dry Weather Flow (ADWF) rate in gallons per capita per day (gpcd) using flow monitoring data ■ 24-hour weekday and weekend patterns for each flow monitoring site ■ Separation of domestic wastewater and infiltration/inflow (I/I) using water meter data ■ Large/Industrial users ■ I/I coefficients and unit rates to characterize metersheds ■ Wet weather flows (also to be generated through H/H modeling) Develop future wastewater flow projections for the same metrics using future population and growth projections. It is anticipated that the future ADWF to be based on existing per unit rate developed for the current conditions in conjunction with future population estimates. Receivables ■ Comments on Flow Monitoring Plan City of Everett MURRAYSMITH 2023 Comprehensive Sewer Plan March 2021 8