Relocating Cupertino Sanitary Sewer for VTA’s Wolfe Road and I-280 Interchange Project Using Trenchless Technology
The Cupertino Sanitary District was asked by the VTA to relocate an existing 15-inch diameter sanitary sewer outside of the footprint of the new Interchange at Wolfe Road and I-280.
Mark Thomas provided design, construction management, and inspection services for the relocation project.
The project used trenchless technologies such as micro-tunneling to install a 30-inch diameter casing pipe and a 15-inch diameter carrier pipe under the freeway, avoiding disruption to traffic on I-280 during construction. Improvements include the installation of approximately 2,000 linear feet of 15-inch sewer mains, approximately 300 linear feet of 8-inch sewer mains, 6 manholes, and the abandonment of roughly 1,700 linear feet of existing 15-inch sewer mains and 4 manholes. The future VTA project will replace the existing freeway overcrossing at North Wolfe Road in Cupertino, and the new overcrossing structures will be in the current location of an existing Cupertino Sanitary District sewer mainline.
