Unalakleet Lagoon Rehabilitation
Location: Unalakleet, AK
The project upgrades involved removing over 30 years of sludge buildup and installing two, 30,000-gallon septic tanks to limit future buildup. A floating suction dredge was used to remove sludge, which was dewatered in geosynthetic geotubes. Geotubes were buried in the lagoon dikes to aid in protection from flooding; this unique alternative saved approximately $3 million as compared to the standard “closeout and replace” option.