City of Orinda Group 2 Storm Drain Lining Project

The Group 2 Storm Drain Lining Project encompasses two vital Capital Improvement Plan (CIP) projects: Orchard SD Repairs (CIP #3101) and Ivy Dr. SD Repairs (CIP #3102). These projects focus on rehabilitating five critical culverts: a 96-inch corrugated metal pipe (CMP) under Moraga Way, a 60-inch CMP beneath Orchard Rd, twin 42” x 72” CMP arches crossing Ivy Drive, and a 96-inch CMP under El Camino Moraga. Harris conducted a comprehensive field investigation to assess the condition of these structures and developed a Preliminary Design Report (PDR) outlining the findings and recommendations. Following this, Harris prepared detailed Plans, Specifications, and Cost Estimates (at 30%, 90%, and 100% design phases), secured environmental permits, and provided bid period services. Construction began in mid-spring 2024. Harris provided design support throughout the construction phase until the project was completed in the late summer of 2024.

Core Elements

The project was centered on preserving and enhancing vital infrastructure through the following key actions:

• Field Assessment and Reporting: Comprehensive site evaluations leading to a Preliminary Design Report that informed subsequent design and construction phases.
• Design and Permitting: Development of detailed engineering plans and specifications, alongside the successful acquisition of necessary environmental permits to ensure compliance with all relevant regulations.
• Stakeholder Coordination: Close collaboration with homeowners, city officials, and regulatory bodies to navigate challenges related to site access, right-of-entry, and environmental protection.
• Innovative Solutions: Implementation of minimally invasive repair techniques, such as geopolymer lining, to address structural issues while minimizing disruption to the surrounding environment.

Beyond the Blueprints

This project presented several unique challenges, including limited site access due to dense foliage, coordination with homeowners for right-of-entry, restricted staging areas, and the complex process of obtaining environmental permits for work within creek areas. Through collaborative site visits, Harris and its environmental subconsultant identified alternative access routes, worked closely with the City and homeowners, and engaged with multiple regulatory agencies to fulfill all requirements. By employing minimally invasive repair techniques such as geopolymer lining, the team overcame these obstacles, completing surveys and finalizing 100% plans and specifications on schedule. Environmental permitting was meticulously coordinated with the Regional Water Quality Control Board, the U.S. Army Corps of Engineers, and the California Department of Fish and Wildlife, so that the project safeguarded wildlife, vegetation, and special species during creek operations.