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SEWER SYSTEM HYDRAULIC MODELING SUPPORT SCOPE OF SERVICES Background and Purpose of Project This document describes the Woodard & Curran scope of work for providing hydraulic modeling support to the City of Santa Ana (City) for tasks related to capacity planning for the City's wastewater collection system, This work will be based on the hydraulic model developed for the Sewer Master Pian Update prepared for the City in 2096, The hydraulic model of the system was created based on population projections and flow monitoring data, and future land use and development plans. The City wishes to use the model for on-going evaluation of capacity -related Issues, Including assessing impacts of proposed new developments ("sewer studies"), evaluating "what -If" scenarios related to proposed new sewer pipelines, and updating the model and capacity assessment based on permanent changes, Scope of Work The tasks included in Woodard & Curran's scope of services are described below. Task f — Model uvafuatlons Under this task, Woodard & Curran will run the model (or expand the model to include previously unmodoled sewers) as requested bydiD City to: 1) Assess the impact on sewer capacity of proposed development projects and determine where additional capacity would be required (e.g., increased pipe size or larger pump station capacity) If needed to handle Increased flows caused by the now developments; 2) Evaluate "whaWf scenarios related to proposed now or improved sewer pipelines or pump slatlons; or 3) Update the model and capacity assessment based on permanent changes In the sower system For each analysis, Woodard & Curran will prepare a brief technical memorandum (TM) summarizing the model assumptions and results, along with appropriate figures (8,g, model - generated hydraulic profiles or thematic maps showing potential surcharge), Deliverables: o Model run assumptions and results TM Woodard & Curran -1- 9/27198