Agmt23 Woodard & Curran, Inc.-1205 Veterans Sewer Analysis -

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REV: 06-22-2023 JB EXHIBIT “A” SCOPE OF SERVICES AND FEE Consultant shall provide hydraulic modeling support for evaluating trunk sewer realignment alternatives related to the 1205 Veterans Boulevard development project. The work will be based on the hydraulic model developed for the City’s Sanitary Sewer Master Plan, as updated under Amendment 1 of the Agreement between the City and Woodard & Curran dated November 4, 2022_for preparation of the Sewer Master Plan. The work items included in this project are described below. Consultant will create new model networks incorporating the two alternatives proposed by the City for re-routing the trunk sewers that run parallel to Veterans Boulevard between Hansen Way and Maple Street. Both alternatives would involve abandoning the existing 30-inch trunk sewer that runs through the 1205 Veterans Boulevard property. The two alternatives, as shown on the City’s markup of the Utility Plan for 1205 Veterans Blvd. prepared by BKF for Raintree Partners dated 10/12/22, are: Alternative 1 – Re-route the existing 30-inch sewer along the north side of the property (“green alignment”). Alternative 2 – Replace the existing 33-inch sewer that runs along the south side of the property along Veterans Boulevard with a large sewer to handle the combined flow from both existing trunks (“red alignment”). Consultant will run the model for the future design storm wet weather flow scenario to evaluate the feasibility of the alternatives and the size of the sewers required. Diurnal wastewater flow profiles, infiltration/inflow rates, and design storm rainfall will be based on those used for the Sewer Master Plan. Flows from the Fair Oaks Sewer Maintenance District (FOSMD), which are tributary to the Veterans Boulevard sewers, will be based on the future scenario model hydrograph developed for the 2021 FOSMD draft Sewer Master Plan. It will also be assumed that all other capacity improvement projects identified in the City’s updated Sewer Master Plan will be in place, with a “free outfall” at the Maple Street Pump Station. Based on the model results, Consultant will determine what new pipelines (and associated sizes) are needed to convey the anticipated design flows to meet City design criteria of maximum flow depth-to-diameter ratio (d/D) of 0.75. The following scenarios will be evaluated: Peak flow not exceeding 0.75 d/D in the re-routed trunk sewers between Hansen Way and Maple Street, accounting for backwater conditions from downstream sewers. Peak flow not exceeding 0.75 d/D in all trunk sewers downstream of the project site (i.e., entire downstream trace to Maple Street Pump Station). ATTY/AGR.2023.142/Woodard and Curran (1205 Veterans Sewer Analysis) (Page 11 of 13)