1- Sandy River Lane Force Main Vulnerability Mitigation TM 9_25_2013.pdf

This is a technical memorandum from the City of Portland, Oregon, dated September 25, 2013, addressing vulnerabilities in the Sandy River Lane Force Main infrastructure and proposing mitigation strategies. The document outlines the existing conditions of the force main system, which serves as a critical wastewater conveyance facility crossing the Sandy River. The memorandum identifies specific vulnerabilities including structural deterioration, seismic risks, and flooding potential, and recommends a comprehensive vulnerability mitigation approach. The proposed project aims to address these identified risks through design and construction improvements to enhance system reliability and resilience. The document provides baseline conditions and technical analysis to support the subsequent Progressive Design-Build procurement process (RFP 2026-80) for the Sandy River Force Main River Crossing Project.

The memorandum presents engineering assessment and risk analysis as the foundation for project justification and scope development. The document establishes the technical rationale for the force main improvements, including detailed vulnerability assessments and recommended mitigation measures. Funding for this project is anticipated through Portland's wastewater infrastructure improvement program. The technical analysis contained in this memorandum directly supports the design-build delivery method selected for the river crossing project, allowing qualified design-build teams to address the identified vulnerabilities through integrated design and construction solutions.