The California Department of Transportation (Caltrans) and the Los Angeles County Metropolitan Transportation Authority (Metro) initiated the SR-710 Tunnel Technical Study to gather and analyze data about soil, subsurface and geotechnical conditions. 
This information will help us know more about rock layering, water levels, faults and other subsurface conditions that might be encountered if tunneling in the Study area, which includes the cities of Alhambra, Glendale, La Cañada Flintridge, Monterey Park, Pasadena, South Pasadena, San Marino, and several northeast communities in the City of Los Angeles.
The Community Education and Outreach Program, developed and led by The Sierra Group, provides reliable, up-to-date information about the study and its findings, tunneling and the use of tunnel technology to extend the SR-710. The program is adaptable to meet the community’s participation needs as the study progresses in several different languages.