By Eva Dusek
If you have ever done excavation work at SLAC, you are probably
familiar with the Excavation Clearance Form. The form, along with
instructions and background information, can be found on the Web at:
The Excavation Clearance Form helps you complete your project safely
and protect the environment during excavation work. It is required for all
excavation projects at the Lab.
Fill It Out Before You Dig
One of the greatest hazards during excavation work is accidental
contact with utility lines. When you submit an Excavation Clearance Form,
the Mechanical Design-Facility Design Services (MD-FDS) group completes
the Utility Survey section and provides you with maps of all documented
underground utilities that are in your excavation area. Because locations
of utilities shown on maps are approximate, a utility line locator may
also need to locate and mark utilities in the field. MD-FDS can assist you
with this process by arranging for a private locator to come on site to
locate and mark utilities in your excavation area.
Protect Yourself from Things You Cannot See
Potentially harmful chemicals ranging from metals such as lead to oils
and solvents may be in the soil where you will be working. It is important
to know what kinds of chemicals you might encounter so that you can
protect yourself and your co-workers. Excavated materials should also be
managed properly to protect the air and nearby streams. The Chemical
Survey portion of the form gives information to help protect both workers
and the environment.
SLAC’s high energy physics research results in radiologically activated
materials. In areas where activated soil or other materials could be
encountered during excavation, please pay special attention to
recommendations provided in the Radiological Survey portion of the form.
SLAC has several miles of underground tunnels that are covered with at
least 25 feet of soil to shield humans and animals from radiation
generated within the tunnels. If your excavation area is near one of these
tunnels, it will be important for you to pay special attention to the
Radiation Safety Survey Beam Lines portion of the form.
•Be sure to indicate on the form exactly where you plan to dig and the
depth to which you will dig.
• Review the comments on the form so that you can protect yourself,
workers and the environment.
• Remember to have the form at the worksite during excavation work.
• Submit a new form if the limits of your excavation expand or deepen.
Contact Eva Dusek (Ext. 3025) or Mike Hug (Ext. 4042) with any
questions or comments about the Excavation Clearance Program.