25E - AGMT FOR ON-CALL ENGINEERING SERVICES

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events ranging from 2- to 100-year return frequencies. The study included hydrologic analyses of the upstream watershed in accordance with the Orange County Hydrology Manual and its Addendum No.1 to determine 24-hour Expected Value and High Confidence design hydrographs tributary to the basin. Upon completion of the routing analyses, we developed modification alternatives to restore freeboard to the basin, which were sensitive to jurisdictional thresholds for regulation by the California Department of Water Resources, Division of Safety of Dams. We assembled the analyses and findings of the study in a final report that will serve as the basis of design for the preferred alternative. PA 51 SAMP Update Reach A and Marine Way Sewer Analysis Irvine, California Year completed: 2017 Client name: Irvine Ranch Water District Contact: Eric Akiyoshi, (949) 453-5552 As part of ongoing PA 51 SAMP Update modeling and report preparation, Stantec was retained by IRWD to evaluate the existing collection system and alternatives for improvements for Reach A and Marine Way sewer collection systems. The Reach A Sewer analysis consisted of evaluation of the existing 12-inch sewer, approximately 5,000 linear feet, including the railroad crossing and sewer crossing the I-5 Freeway. System analyses included various flow re-routing alternatives and upsizing of the existing sewer for interim and ultimate flows. The Marine Way 18-inch sewer, approximately 3,500 linear feet, analysis investigated improvement alternatives and flow analyses for various development conditions. Analyses were conducted utilizing InfoSewer modeling software, with technical memoranda prepared for stakeholder review and acceptance. ® Stantec City of Sar26E-MmOn-Call Water Resources Engineering Services RFP No. 19-100 1 W