Portola Valley, CA
Size: 4,600 sf
Market: Single Family Residential
Scope: Structural Engineering
Randy Collins was approached by a close friend to consider the structural design of a new single family residence on a site where the San Andreas Fault runs through the front yard, and contains liquefiable soils. Randy, not content to design “code minimum” for dear friends and their children, presented options that would make the house more disaster resistant than code regulations require. Given the geotechnical and geological challenges of the site, this resulted in the recommendation of a 12” thick concrete mat slab foundation, further reinforced with a grid of 30” deep concrete beams. The design sailed through the rigorous Portola Valley Building Department approvals process.