Metro contractors are preparing to conduct a series of geotechnical field tests in the Westwood area as a part of the Final Environmental Impact Statement/Environmental Impact Report (Final EIS/EIR) for the Westside Subway Extension. This work will build on the data gathered during the Draft EIS/EIR for the project and provide further soil and seismic information along the route of the Locally Preferred Alternative (LPA). In certain areas, noise and vibration tests will also be conducted. Following the tests, the data will be analyzed and used to make further informed decisions about subway construction.
The upcoming work will consist of borings to assess soil conditions in the area. Work will be conducted using a truck-mounted rig with a crew of up to four people. The drill bit will be advanced to the anticipated tunnel depths in the area, or greater. Drilling fluid consisting of bentonite slurry will be pumped into the borehole and circulated into a wash-tub at the ground surface, where cuttings will be removed prior to re-circulating the fluid through the hole. Soil sampling will be performed at 2½ to 5-foot vertical intervals by advancing a sampler using an automatic hammer. At the conclusion of drilling, the slurry will be placed in drums, tested, and disposed of off-site. The drums will be removed from the work site on a daily basis. The borehole will be filled with grout and its top patched with asphalt to match the surrounding grade.
Where: City of Los Angeles (Westwood Area)
When: December 13, 2010 - December 17, 2010; Weekdays; 9am-3pm
What to Expect:
Other Important Information
Comments may be submitted by:
Online: Complete our electronic Comment/Question Form
By U.S. Mail:
David Mieger, Project Director
DEO, Countywide Planning & Development
Los Angeles Metropolitan Transportation Authority
1 Gateway Plaza, M/S 99-22-5
Los Angeles, CA 90012
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