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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00953
PWS Name:	WILLAMINA, CITY OF

Who Was Contacted and Phone:	Justin Riggs (503) 437-7003
Contact Date:	11/07/2011
Contacted By:	KALISH, FRED (REGION 1)
Contact Method/Location:	Office

Assistance Type:	OTHER REGULATORY - REGULATORY ASSISTANCE
Reasons:	Operations Operations

Details:	SUMMARY: Malfunction of PLC DETAILS: Justin contact DWP to report that at 5:00 pm on Saturday November 5th, the PLC (programable logic control) of the WTP failed. As a result, the plant was automatically shutdown and all data recording was lost until the PLC could be reprogramed. Justin checked the plant at 12:00 noon on Sunday, and discovered the situation. He worked to reprogram the PLC and finished approx at 2:00 pm that afternoon, at which point he restarted the WTP. At no time did untreated water leave the treatment train or enter the clearwell. It is unclear why the PLC crashed - perhaps a power fluctuation (?). ACTION NEEDED: None at this time.