12-inch ductile iron water main

The job

A commercial property needed about 560 feet of new 12-inch ductile iron water main with a fire hydrant, a fire sprinkler service, an air and vacuum release valve, and domestic water services to several buildings. Most of the route ran through concrete and asphalt.

How we ran it

Before any pipe went in the ground we potholed every located utility and both connection points, to confirm the main could be built as designed. Finding a conflict with a vactor truck costs a day. Finding it with the trench open costs much more.

The trench was shored with trench boxes for its full length. Spoils from private property were stockpiled beside the trench and reused as backfill. In the right of way we exported the spoils and backfilled with crushed rock. Every paved section was capped with temporary asphalt.

What we did

• Saw-cut and removed about 1,000 ft of concrete and asphalt along the route.
• Installed about 560 ft of 12 in. ductile iron main on 12 in. of sand bedding, with thrust blocks, valves and a fire hydrant.
• Ran four domestic water services and one fire sprinkler service.
• Planned the flush test discharge ahead of time, including dechlorination.