Underground Utility Inspection: 5 Things Contractors Should Check Before an Inspector Arrives

A municipality or engineer inspector just pulled up to your jobsite. Are you ready?

As a utility contractor, you don't want an inspection that leads to costly rework, project delays, or having to dig up something your crew just installed. Whether you're installing precast manholes, catch basins, junction boxes, or underground piping systems, the small details matter. Being prepared for an Underground Utility Inspection means ensuring your work meets approved plans, municipal specifications, and project requirements.

Here are five things every utility contractor should double-check before an inspector arrives.

1| Make Sure Your Excavation Is Done Right

Before installing any underground utility structure, proper excavation sets the foundation for everything that follows. An inspector may look at whether your excavation meets the required dimensions, depth, bedding, and installation specifications.

What to double-check:

• Is the excavation at the correct depth and location?

• Is the bedding material properly placed and prepared?

• Is the structure sitting on a stable, level foundation?

• Are you following the approved plans and excavation safety requirements?

Contractor Tip: Don't rush your excavation just to get the structure in the ground. Poor preparation can lead to settlement, alignment issues, and expensive corrections later.

2 | Know Your Municipality's Specifications

Every municipality has its own requirements, and understanding them early can save time, money, and unnecessary rework.

Before bidding or beginning construction, consider scheduling a pre-bid or pre-construction meeting with the municipality or utility owner. This is your chance to clarify unclear specifications, discuss project expectations, and ask whether there are additional requirements beyond what the plans outline.

Once construction begins, keep that communication going! Invite a municipality or utility representative to visit your jobsite early in the project. When you've completed enough work for them to evaluate, such as installing your first drainage box, ask the inspector to take a look. This gives you the opportunity to confirm you're meeting their expectations before repeating the same installation throughout the project.

Contractor Tip: You're the expert in your field, so don't be afraid to explain and stand behind your installation methods. At the same time, stay open to feedback and understand the municipality's or utility owner's specific needs. A little communication and collaboration early on can prevent major headaches down the road.

3 | Install Your Cleanouts Correctly

Cleanouts may seem like a small part of an underground utility project, but improper placement or installation can create problems during inspection and future maintenance. Cleanouts provide access to underground piping systems for maintenance and clearing blockages, so accessibility and proper installation are important.

What to double-check:

• Is the cleanout installed in the correct location?

• Is it oriented and connected according to the approved plans?

• Is the cleanout accessible for future maintenance?

• Is the cleanout brought to the required finished grade and properly protected?

Contractor Tip: Think beyond installation day. A cleanout that's difficult to locate or access can create headaches for the municipality or maintenance crew down the road.

4 | Don't Overlook Your Backfill Material

What goes around your underground structures and pipes matters as much as the structures themselves. Improper backfill material or compaction can cause settlement, pipe movement, and pavement problems after construction.

What to double-check:

• Are you using the specified bedding and backfill materials?

• Are you placing backfill in the required lifts?

• Is each lift compacted according to project specifications?

• Have you completed the required compaction tests or inspections before covering the work?

Contractor Tip: Make sure your crew knows the difference between what's available on-site and what's actually approved for backfill. Using the wrong material can mean removing and replacing work you've already completed.

5 | Check Your Joint Sealant Application

Whether you're installing a manhole, catch basin, or another precast structure, proper joint sealant application is critical to preventing unwanted water infiltration and leakage.

What to double-check:

• Are the joint surfaces clean and properly prepared?

• Are you using the correct sealant specified for the application?

• Is the sealant placed in the proper location and applied continuously?

• Did you follow the manufacturer's installation instructions?

• Are the joints properly aligned and seated?

Contractor Tip: Mud, debris, improper placement, or gaps in sealant application can compromise a joint. Taking a few extra minutes to inspect your sealant before setting the next section can save significant time later.

Contact Us Before an Underground Utility Inspection

At Gainey's, we understand contractors work against tight schedules, changing jobsite conditions, and demanding project requirements. That's why we provide quality precast concrete products and work with contractors to find practical solutions that make installation easier.

Have questions about precast structures for your next underground utility project? Contact the Gainey's team. We're here to help you find the right solution before your project gets underway.