Fred Oldenhoff
Runs the crews and equipment — the person making sure the grade is right and the site is protected.
Field & operations
About
A Band of Brothers
Army. Air Force. Marines.
In 2026, three Service Disabled Veterans joined together to start Sentinel Earthworks LLC. These veteran entrepreneurs each have deep experience in their specialization and together create a team that can move mountains to Complete the Mission: On Spec. On Time.
Delivering A Grade. Guaranteed.
The partners
Three veterans, one mission
Robert Mammucari
Your point of contact from first call through scope, schedule and closeout.
Sales & project management
Troy Beane
Oversees structure, compliance and the standards the company holds itself to.
Governance
Why Sentinel
A quality watch
A sentinel is posted and paying attention. We are a Service Disabled Veteran Owned Small Business, and we bring the same discipline to every job across the Delaware Valley — plain answers and a protected property for homeowners; submittals, look-aheads and grade to plan for general contractors.
Headquarters
130 Christopher Ln, Harleysville, PA
Let's talk about your project
Residential site visit or commercial bid — start here.