Pier 1 N. Drydock, Associated Real Estate Agreements & Removal of Cooling Tunnels

The Silvergate Tunnel Abandonment Project, managed by the San Diego Unified Port District, involves the permanent abandonment and stabilization of approximately 1,000 linear feet of decommissioned dual underground cooling tunnels located about 20 feet below ground at BAE Systems in San Diego, California. The scope of work includes the partial demolition and abandonment of concrete intake and discharge structures and bulkhead walls, the installation of reinforced concrete bulkheads, and the backfilling of the tunnels in place. As part of the shoreline restoration, the project will deploy temporary cofferdams along approximately 110 linear feet of rock revetment across two separate locations. Following the removal of concrete structures, the shoreline will be restored with rock revetment between Mean Lower Low Water and Mean Higher High Water elevations, utilizing material and slopes that match the existing adjacent revetment. All demolished materials not reused on-site will be transported and disposed of properly. The project is conducted in compliance with the California Environmental Quality Act and was approved following the preparation of an Environmental Impact Report.