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B. Develop Sewer System Model <br />1. The objective of this task is to prepare a dynamic hydraulic model of the City's <br />existing sewer system using the City's GIS database, and Bentley's SewerGEMS, <br />commercially available hydraulic modeling software that is compatible with -ESRI <br />GIS data. <br />2. The City has a current ArcGIS'database, including a comprehensive sewer map in <br />GIS format showing all sewer mains and manholes, which shall be used as' the -basis <br />for the preparation of the hydraulic model. <br />3. The survey data included in the 2003 Sewer Master Plan and the follow -up survey <br />data should be used within the model. <br />4. The consultant shall recommend the best practices and approach to creating the <br />hydraulic model from the City's GIS and existing data with special attention to <br />populating pipe invert elevations using the above survey data assuring that all pipes <br />are on the same datum. <br />5, The hydraulic model is expected to be comprehensive and shall include all major <br />sewer mains appropriate for hydraulic modeling. The consultant shall, in coordination <br />with the City staff, identify the major sewers to be initially hydraulically modeled and <br />studied. As a minimum, all of the sewer mains modeled in the 2003 Sewer Master <br />Plan shall be included in the update. The consultant shall, in coordination with City <br />staff, identify a plan and needs assessment for further hydraulic modeling of non - <br />major City sewers for capacity assurance. All OCSD trunks originating within the <br />City shall be included in the model. The drainage basins shall be consistent with the <br />2003 Sewer Master Plan and shall correlate to the corresponding OCSD trunk sewer. <br />6. The two existing lift stations will not need to be analyzed by the update. The lift <br />stations shall be included in the model only to transport the flows downstream. <br />7, A number of non -hydraulic attributes shall be included in the model such pipe <br />material and year of construction. <br />8„ The model shall incorporate all land use data including the City's general and specific <br />plans and populationfcmployment census data and projections.. <br />C. Develop Wastewater Flows <br />1. Update the flows based on population and employment data and projections. Evaluate <br />impacts of past and current water conservation measures, water shortage, water <br />reduction measures implemented by the City, <br />2. Obtain flow monitoring data from long -term meters installed by OCSD that apply to <br />the City's sewer system. Review and evaluate previous flow monitoring data included <br />