Inspections happen about every five years

A dive team is on board to inspect and clean the city’s reservoirs.

On Monday, it worked on Lake Oswego’s McNary Reservoir No. 2, one of 15 water reservoirs in the REVIEW PHOTO: VERN UYETAKE - Brad Woolf, part of a LiquiVision dive team, gets ready to go into Lake Oswegos McNary Reservoir No. 2 early Monday morning.

Unlike some cities, Lake Oswego has covered reservoirs, and as a result little sediment ends up in the water, said Kari Duncan, the city’s water treatment plant manager.

Even so, it’s considered a best management practice to inspect them about every five years and to clean them on occasion, too, she said.

The dive team, from LiquiVision in Klamath Falls, is using a sort of underwater vacuum cleaner to suck up any silt or fine particle matter that has collected on the reservoir floors. How long the whole process will take is unclear; the amount of time it takes to inspect and clean varies according to the size of each REVIEW PHOTO: VERN UYETAKE - Jordan Tillman helps Brad Woolf don a diving suit as he prepares to inspect and clean the reservoir.

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