Infrastructure Installed Below Your Site

Underground utility installation and trenching for water, sewer, and storm systems in the Illinois Valley and surrounding areas.

Your commercial property in the Illinois Valley depends on underground infrastructure that delivers water, removes wastewater, and manages stormwater without leaks or blockages. Gillan Construction LLC installs water lines, sewer connections, and storm drainage systems using trenching methods and materials that meet municipal standards and keep your site functional for years.

This service covers excavation and trenching for utility corridors, placement of pipe at specified depth and slope, backfill and compaction to prevent settling, and coordination with inspectors and utility providers. Installation follows engineered drawings for alignment, grade, and connection points. Each line is tested before backfill to confirm it holds pressure or drains correctly.

If your development in the Illinois Valley requires underground utility installation that meets code and connects to municipal systems, reach out to Gillan Construction LLC to discuss your project schedule and site plans.

How Pipe Gets Placed and Tested Underground

Utility installation in the Illinois Valley begins with locating existing lines to avoid damage, followed by trenching to the depth your engineer specifies. Bedding material is placed to support the pipe, and sections are joined and aligned to match slope requirements for drainage or pressure ratings for water. Backfill is placed in compacted lifts to prevent future settling.

Once the utilities are installed, you see water lines that deliver consistent pressure, sewer lines that drain without backing up, and storm systems that move runoff away from structures. Pipes sit at correct depth and alignment, joints are sealed, and there are no low spots where blockages form. The site surface is restored and stable after backfill.

Gillan Construction LLC coordinates with municipal inspectors and utility departments to schedule testing and connection approvals. The service does not include above-ground fixtures, meters, or backflow prevention devices, which are installed by plumbers or utility providers. Trenches are dewatered if groundwater is encountered, and shoring is used when soil conditions require it for safety.

What Comes Up When Planning Utility Work

Underground utility work involves coordination with multiple agencies and precise depth and slope control, so clients often ask about inspection timing, material standards, and how installations affect project schedules.

What depth are water and sewer lines installed at?

Depth depends on frost line, existing utilities, and municipal standards. Water lines in the Illinois Valley are typically buried below frost depth to prevent freezing, and sewer lines are placed deep enough to drain by gravity where possible.

How is pipe slope verified during installation?
A laser level or transit is used to check grade as pipe is placed. Sewer and storm lines must slope at least one-quarter inch per foot to ensure drainage without standing water.
When are utility lines inspected?
Inspections occur after trenching but before pipe is placed, after pipe is laid but before backfill, and sometimes after backfill when a pressure or leakage test is required. Your municipality schedules these based on local code.
What happens if an existing utility is found during trenching?
Work stops, and the utility owner is contacted to verify location and clearance requirements. Gillan Construction LLC adjusts trench alignment or depth to avoid damage and maintain code compliance.
Why does backfill need to be compacted in layers?
Loose backfill settles over time, which can crack pavement, damage pipe joints, or create depressions in the site surface. Compacting in lifts ensures the trench remains stable and prevents future problems.

Gillan Construction LLC installs underground utilities using trenching and placement methods that meet municipal standards and coordinate with your project timeline. If your commercial site in the Illinois Valley needs water, sewer, or storm system installation, get in touch to review your utility plans and schedule.