Over the past 5 years, HGL has completed underwater CERCLA Remedial Investigation and Remedial Actions at sites in Puerto Rico, Hawaii, Michigan, New York, and Ohio for the U.S. Army Corps of Engineers (USACE) Huntsville Center and Baltimore District. HGL has coordinated this work with the USACE Honolulu, Louisville, Jacksonville, and New York Districts.
HGL has deployed various digital geophysical mapping (DGM) towed systems, used side-scan sonar (SSS), and completed remotely operated vehicle (ROV) inspections. In addition, HGL projects have involved using unexploded ordnance (UXO) divers to reacquire and dig DGM anomalies, to conduct analog and geophysical detect and dig operations, and to conduct underwater demolition using Vulcan low-order/deflagration technology. All of these activities were completed primarily using SCUBA diving techniques. HGL has also completed underwater drum removal using supplied air and hard hat diving to hoist overpacked drums to the surface for further characterization. These activities have been completed in conditions that have varied from calm lake environments to rugged sea state conditions north of Oahu, Hawaii, with significant waves and underwater surge states. Projects have required a biological diver and lookout staff for marine mammals such as sea turtles and monk seals.
The following projects demonstrate HGL’s expertise in providing these services:
Underwater Removal Action at Oahu Island Targets FUDS, HI
Remedial Investigation/Feasibility Study (RI/FS) at Former Fort Custer FUDS, MI