AGS, as a joint venture partner with Moffatt & Nichol, provided project management and engineering design services for the South Ocean Beach Coastal Erosion and Water Infrastructure Protection project. The project included design and construction of a long-term engineered solution that combines coastal management measures with structural protection of the Lake Merced Tunnel (LMT)to address erosion hazards at the South Ocean Beach area.
AGS conducted a geotechnical field investigation; prepared a Geotechnical Assessment Report and a Conceptual Engineering Report (CER); conducted an environmental site assessment; performed seismic soil-structure interaction(SSI) analysis; prepared Geotechnical Data Report (GDR) and Geotechnical Interpretive Report (GIR); and participated in design of the project. Analyses and recommendations included preliminary recommendations for the design and construction of temporary structures, deep foundations, trench excavation, and backfill along the entire alignment as well as alternative solutions for the wall encompassing deep soil mixing, soil improvement, and structural and non-structural solutions.
AGS’ civil engineering team conducted investigations to identify all utilities surrounding the 14-foot Lake Merced Tunnel and its proposed protection wall. Working with project surveyors, the team converted existing facilities information from record documents to the project horizontal and vertical control datum. They prepared CADD drawings and narrative for the CER based on data from numerous utility companies and City jurisdictions. The team reviewed impacts to existing facilities and provided mitigation recommendations. The AGS team participated in alternatives analysis for the SF Zoo Parking Lot; realignment of the existing access road; preparation of project alternatives and CER; and existing utilities documentation.
AGS’ structural engineering team prepared plans, profiles, and geotechnical and structural calculations for several site concrete retaining walls along the alignment. The retaining walls range from 40 to 100 feet long and 2 to 6 feet in height along the pedestrian walkway.
