25K - AGMT - SEWER MASTER PLAN UPDATE

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B. Develop Sewer System Model 1. The objective of this task is to prepare a dynamic hydraulic model of the City's existing sewer system using the City's GIS database, and Bentley's SewerGEMS, commercially available hydraulic modeling software that is compatible with ESRI GIS data. 2. The City has a current AreGIS database, including a comprehensive sewer map in GIS format showing all sewer mains and manholes, which shall be used as the basis for the preparation of the hydraulic model. 3. The survey data included in the 2003 Sewer Master Plan and the follow -up survey data should be used within the model. 4. The consultant shall recommend the best practices and approach to creating the hydraulic model from the City's GIS and existing data with special attention to populating pipe invert elevations using the above survey data assuring that all pipes are on the same datum. The hydraulic model is expected to be comprehensive and shall include all major sewer mains appropriate for hydraulic modeling. The consultant shall, in coordination with the City staff, identify the major sewers to be initially hydraulically modeled and studied. As a minimum, all of the sewer mains modeled in the 2003 Sewer Master Plan shall be included in the update. The consultant shall, in coordination with City staff, identify a plan and needs assessment for further hydraulic modeling of non - major City sewers for capacity assurance. All OCSD trunks originating within the City shall be included in the model. The drainage basins shall be consistent with the 2003 Sewer Master Plan and shall correlate to the corresponding OCSD trunk sewer. 6. The two existing lift stations will not need to be analyzed by the update. The lift stations shall be included in the model only to transport the flows downstream. 7. A number of non - hydraulic attributes shall be included in the model such pipe material and year of construction. 8. The model shall incorporate all land use data including the City's general and specific plans and population /employment census data and projections. C. Develop Wastewater Plows 1. Update the flows based on population and employment data and projections. Evaluate impacts of past and current water conservation measures, water shortage, water reduction measures implemented by the City. 2. Obtain flow monitoring data from long -term meters installed by OCSD that apply to the City's sewer system. Review and evaluate previous flow monitoring data included 25K -14