Geotechnical Field Work: Beverly Hills Area
Metro contractors are preparing to conduct a series of geotechnical field tests in the Beverly Hills 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.
Monday, April 4, 2011 through Friday, April 8, 2011 from 9:30am-4:00pm Metro contractors will conduct work at the following locations:
- Wilshire Boulevard west of Beverly Drive
Note: Should any work need to be cancelled and rescheduled, Metro will inform you of new work date(s)/time(s).
The equipment to be used during the field testing is described below:
Sonic Core Drilling
Sonic core borings will be drilled at two locations along Santa Monica Boulevard to obtain soil/rock samples for characterization and testing, and will consist of a truck-mounted rig with a trailer and a crew of up to 4 personnel. As for all investigations, the work areas will be scanned for utilities prior to drilling, and the upper soils will be hand augered. Continuous samples of soil/rock will be retrieved using a variable-frequency drill bit; no drilling mud will be used. At the conclusion of drilling, the hole will be filled with grout and its top patched with asphalt to match the surrounding grade. Parking lanes and traffic lanes will need to be coned off during work.
What to Expect During Sonic Core Drilling:
- A drilling crew consisting of up to 4 technicians per rig.
- A truck-mounted drill rig with trailer (see photo below).
- Parking lane and/or one lane of traffic will be blocked while work is under way on residential streets and up to two lanes on business/arterial streets.
- Moderate to loud noise and moderate to strong vibration.
- Lanes will be cleared at the end of the work period and re-opened for regular use.
Other Important Information:
- All work has received necessary permits and approvals.
- Additional fieldwork following this testing is anticipated. We will inform the area(s) where and when this work will take place.
- For more information about the Westside Subway Extension, please leave a message at 213.922.6934 or online at www.metro.net/westside.
- For day-to-day testing location updates, please follow us at twitter.com/westsidesubway .
For emergencies or issues needing immediate attention, please call 323.236.2117.