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Pendleton, Oregon, USA
City of Pendleton Water Treatment Plant
c/o City of Pendleton
500 SW Dorion Ave.
Pendleton, Oregon, 97801
USA

Contact Information:
Contact:  Bob Patterson, Director
Email: 
Telephone:  541-966-0202
Fax: 

Plant Operation: Municipal

Processing: Water

Web site:
http://www.pendleton.or.us/watersupplydevelopment.htm

Plant/Process Description:
Water Treatment Plant: The Water Treatment Plant uses ultra-filtration membranes to filter the water at a rate of 6 million gallons per day. The membranes provide a physical barrier to remove sediment and disease-causing organisms. Water from Thornhollow Springs and the Umatilla River will be siphoned through the membranes.

A small portion of the water will become concentrated with sediment; this is called reject water. The reject water will be siphoned from the membrane basins to settling ponds. The sediment from this reject water will settle out in the ponds, and the remaining water will be pumped back to the raw water feed entering the membrane basins to be filtered again.

River Intake/Pump Station: The intake/pump station has been constructed to divert up to 15 million gallons per day from the Umatilla River. Intake screens are fish friendly and do not have a detrimental effect on natural stream flows.

AQuifer Storage Recovery (ASR): Well #1, located at Kiwanis Park, and Well #5, located at Stillman Park, have been modified for storing and recovering the filtered water from the new Water Treatment Plant in a process known as Aquifer Storage and Recovery (ASR).

During the winter months when there is plenty of water in the Umatilla River, water will be filtered at the Water Treatment Plant and the amount not used by citizens will be pumped into the deep basalt aquifers through Well #1 and Well #5.–this is aquifer storage. During the summer months when demand for water is at its peak, water will be pumped out of the deep basalt aquifers–this is recovery.

Owner:
City of Pendleton
Web site:  http://www.pendleton.or.us/
Operating Company:
City of Pendleton
Web site:  http://www.pendleton.or.us/
Directions:

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