Location: Unalakleet, AK
The public water system contained elevated levels of organics and had limited capacity to meet summer water demands. Upgrades included a direct filtration process, coagulant injection system, and pH adjustment system. CRW performed engineering services including preliminary jar testing, a pilot study, design of the proposed upgrades, procurement, construction administration, and both project startup and closeout.
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.
