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Subsurface Investigations in Alexandria

African American Heritage Park

Our crews will be drilling and digging within African American Heritage Park to collect additional soil samples and identify potential conflicts we could encounter when replacing the existing Commonwealth Interceptor shown in this informational flyer.

Near Jones Point Park and S. Royal Street 

Our crews will also be drilling at the end of S. Royal Street and within Jones Point Park to collect soil samples and environmental data that will help inform the design and construction of the tunnel system project. Read more about this activity in our boring flyer.


Please contact the RiverRenew Communications and Outreach Team at or 703-518-6030.

More Boring Details

A boring is essentially a small, deep hole in the ground – about the diameter of a softball. We’ll conduct borings to collect two types of soil samples:

Auger sample: Think of a long drill bit going into the ground.

Split-spoon sample: Think of a hollow straw being pushed into piece of cake.

You may see drilling equipment, or “drill rigs,” with three-or four-person teams at the locations outlined on the map. The equipment will move from location to location and spend approximately 2 weeks at each site, weather permitting. Please note, boring locations have been chosen with the intent of posing minimal disruptions to the community, but some locations may require temporary changes in pedestrian and traffic patterns. We will notify you of any changes in traffic conditions, and we apologize in advance for any inconvenience!

Of course! But please keep a safe distance from all equipment/workers and be mindful of your surroundings.

Kind of. Think of a DASH bus idling and pulling away from a stop. Please note that we’ll only be working during the hours of 7:00 a.m. and 6:00 p.m.

Likely not. Soils pulled from the ground will pretty much smell like dirt.

We’ll be drilling on weekdays between 7:00 a.m. and 6:00 p.m. 

Yes. These types of investigations are very common in Alexandria, and our crews are trained to perform this type of work.

Map of soil sampling activities
(Click the image to view a larger version.)

Illustration of a typical boring setup

Illustration of a typical boring setup


Analyzing a split-spoon sample