07 - Laserfiche WebLink

EXHIBIT A- SCOPE OF SERVICES Task 3—Sewer Model Development and Calibration Under this task, Woodard &Curran will develop a hydraulic model of the City's sewer collection system. The model will include the all City-owned sewers in the system. Subtask 3.1 —Select Modeling Platform. Woodard & Curran will work with the City to select appropriate software for the hydraulic model that best meets the City's needs. At a meeting with City staff, Woodard & Curran will describe and demonstrate as appropriate potential software options and discuss the advantages and disadvantages of each software program. Subtask 3.2— Hydraulic Model Development. Using data from the City's GIS, Woodard &Curran will develop a hydraulic model of the City's sewer system. Available sewer record drawings will be used to supplement the data in GIS if necessary and available. Further interpolation may be needed for any remaining data gaps. The modeled sewer network will include all City-owned sewers and pump stations. Following the initial construction of the model database, a QA/QC process called "model validation,"will be used to verify the data. This process includes checking network connectivity and data completeness and reasonableness for apparent discrepancies(e.g., negative pipe slopes, outlet pipe invert elevations higher than inlet invert elevations etc.). Missing or suspect data will be resolved to the extent possible through review of available record drawings or field surveying conducted under Task 2. The source of all new or updated data in the model will be documented. Woodard & Curran will also define the model "subcatchments" (areas loading to the modeled network). It is anticipated that the subcatchments will be defined based on a process that associates each parcel in the City's sewer service area to a sewer pipe in the existing collection system, and then aggregating the parcels based on the sewer pipe to which they are connected. Subtask 3.3— Develop Existing and Future Wastewater Flows. Woodard &Curran will review existing data collected under Task 2 to determine the best approach for using this data to develop existing base wastewater flows. It is anticipated that water use or City sewer billing records will be the primary source of data for developing model loads and will draw upon the data developed for the City's water system modeling. Commercial, industrial, and/or institutional users which may contribute significantly greater flows than average or exhibit atypical use patterns will be identified individually based on water use data or information provided by City staff. Existing parcel loads will be aggregated to the model subcatchments as described in Subtask 3.2. Woodard &Curran will coordinate with the City Planning Department staff to discuss specific planning issues and potential growth or redevelopment areas in the City. It is anticipated that much of this information will have been developed for the City's water system modeling. Using this information, estimates of future wastewater flows based on the type, density, and location of projected future development and redevelopment areas will be developed through a planning horizon agreed upon by the City. Future model loads will be assigned to the subcatchments delineated in Subtask 3.2. The projected timing of any growth/redevelopment will also be discussed to provide input on potential phasing of collection system improvement projects identified as part of the capacity evaluation. Subtask 3.4— Regulatory Considerations. Woodard & Curran will review existing and pending legislation, including the Statewide General Waste Discharge Requirements for Sanitary Sewer Systems (WDR)that may impact the configuration or operation of the existing or future sewer collection and pumping system. In conjunction with the work under Subtask 4.1, these issues will be discussed with the Woodard &Curran -4- 12/20/21