53 Colton Street
53 Colton Street is a 96-unit apartment building for formerly homeless, single adults. The development will consist of a six-story, 70- to 75-foot-tall building with one below-grade basement. San Francisco Bay Area Rapid Transit tunnels cross beneath a portion of the site. Langan performed Phase I and Phase II Environmental Site Assessments to identify recognized environmental conditions present at the site and further evaluate the environmental quality of the subsurface conditions. We also conducted geotechnical investigations to evaluate subsurface conditions and develop geotechnical design criteria for ground improvement, foundations, shoring, and seismic design. During construction, Langan will perform hazardous soil removal observation and consultation for Site Mitigation Plan compliance, and observe ground improvement installation and testing, shoring installation, foundation excavation, groundwater monitoring, and subgrade preparation.