ACLS Millbrae Station Project

The ACLS Millbrae Station project involved a proposed building and parking structure. The site is triggered by interbedded clay and sand layers and is in a seismically active region where several earthquakes had been recorded. The major active faults in the area are the San Andreas, Pilarcitos, San Gregorio, Monte Vista-Shannon, and Hayward-Rodgers Creek faults. Strong ground shaking during an earthquake can create soil liquefaction which can result in ground failure. LCC was chosen to help against ground forces by absorbing shock and preventing damage to the structures. There was an approximately 40,900 SF of 3” mud slab poured over loose to medium dense sand to support the mat pressure, provide proper drainage, and encapsulate the exposed surface that would be otherwise dusty or muddy during construction. The LCC was tested 65 PCF density and 1,000 PSI UCS at 28 days strength.