Terracon's Des Moines office is a leading provider of geotechnical and construction materials testing services on transportation projects in the state of Iowa. An example project is the new 5-mile, multi-lane arterial that will connect downtown with US 65 at Pleasant Hill. The project includes a new 7-span dual bridge over the Des Moines River and several other bridges, relocating levees, and mitigating difficult soil conditions. Terracon's scope includes exploration, field and laboratory testing, engineering analyses (seepage, global stability, and settlement), and geotechnical design. Bridge drilling was performed from Terracon's barge-mounted rig. Terracon's scope also includes construction testing of soils and concrete (plant inspections and laboratory testing) and vibration monitoring during pile installation.