Grinnell College is expanding its heating, cooling, and power distribution systems as part of a long-term commitment to reduce fossil fuel consumption and move toward carbon neutrality. To support this initiative, Iowa Trenchless was selected to complete multiple trenchless installations as new supply and return lines were routed across Highway 6 and throughout central campus.
The work included nine auger bore crossings and more than a dozen HDD crossings, enabling new dual-wall insulated HDPE pipe to be installed without disrupting sidewalks, green spaces, or dense underground utility corridors. Four of the auger bores were installed side-by-side at 320 feet each, with only 12 inches of separation—requiring exceptional precision.
Iowa Trenchless used the Akkerman 240A Guided Boring Machine alongside a Barbco 36/48-750 Auger Boring Machine, completing more than 2,100 linear feet of steel casing for 6-inch and 10-inch carrier pipes. Another 1,600+ feet of HDPE was installed by HDD in parallel pairs to create complete supply-and-return loops across campus.
Midwest Vac Professionals supported the operation by performing hydro excavation to verify utilities, CCTV sewer inspections before and after installation, and hauling and disposing of drilling fluids. This coordinated approach ensured a safe, efficient installation that advanced Grinnell College’s energy and sustainability goals.
