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710 Tunnel Technical Study Information
About the Exploration Program
In June 2008, Caltrans and Metro began the SR-710 Tunnel Technical Study to examine the possibility of extending the SR-710 using a tunnel. The study is being conducted in a route neutral manner. This means that all reasonable and practicable alternatives for completing the route are being considered within the Study area, which encompasses the cities of Alhambra, Glendale, La Cañada-Flintridge, Los Angeles, Monterey Park, San Marino, South Pasadena and Pasadena. Information gathered throughout the study will describe soil and sub-surface conditions and will determine the feasibility of building a tunnel to complete SR-710. This study is not an environmental assessment.
This phase of the Study will involve research, exploration and technical analysis of the soil conditions found if tunneling at depths of more than 250 feet. The Exploration Program is comprised of two integrated activities:
Boring: Information about various soil types, such as rock or sand, will be gathered by drilling (boring) deep into the ground and producing soil samples which can then be analyzed. Boring will take place at approximately 33 locations throughout the study area.
Geophysical Line Testing: This activity will provide an electronic image of soil conditions along a specific area. Information on rock layers and layering, near-surface faulting, sub-surface voids, and bedrock elevations or depths will be provided.