![]() The water was then pumped through a multimedia filter-system, a bag filter system, and a granular activated carbon system before discharge back into the river. The water and sediment mixture was initially discharged to Bakr tanks for primary settling. Similar to equipment used for underwater archaeological excavations, the diver vacuums from the river bottom fine sediments, which are then discharged to a treatment facility. Low-volume dredging used a diver-operated suction hose to remove sediment with minimal disturbance. Conventional dredging would have resuspended the fine sediments containing PCBs and sent them downriver. In the face of tight deadlines and public concerns, the remediation project was completed in record time while using a unique combination of treatment methods, including low-volume dredging and capping. The site had PCB-Contaminated sediments, which had to be removed before construction could begin. In 1986, Portland General Electric (PGE) donated a parcel of prime riverfront land to the Oregon Museum of Science and Industry (OMSI) in Portland, OR, for OMSI's new facility.
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