Last week GMU provided special inspection for the construction of this HydroArch culvert that enables road construction over a environmentally protected streambed. The HydroArch construction consisted of about 120 yards of shotcrete, carefully placed by a certified nozzle man such that no voids or shadowing behind the rebar occured. The shotcrete was applied in 3 to 4 foot thick lifts, starting at the bottom of the structure, using a high-pressure mix of air and concrete. This process is time-consuming, taking about 10 hours to complete on this particular HydroArch. In addition to providing special inspection services, GMU is also providing geotechnical design and construction support for this major project in Orange County.
UPDATE (March 10, 2015) – The HydroArch is now complete, and backfill is beginning, as shown on the photo to the right.