OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 90416 | ||
| PWS Name: | GEORGIA-PACIFIC, WAUNA MILL | ||
| Who Was Contacted: | Macs Burke & George Jones | ||
| Contact Phone: | 503-298-3105 (Email address hidden) | ||
| Contact Date: | 12/22/2025 | ||
| Contacted By: | FARRELLY, PETER (DWP) | ||
| Contact Method/Location: | Phone | ||
| Assistance Type: | INCIDENT RESPONSE | ||
| Reasons: | Operations |
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| Details: | Macs and George described a turbidity-monitoring malfunction event for several early morning hours (3 am - 8 am) which compromised Operators' abilities driving them close to limitations. After reviewing the specific turbidity, time, clearwell volume, and demand flowrate numbers, no filtration or disinfection processes were compromised enough to warrant public notice, or a violation. Consumers were notified to reduce potable water use as an extra preventative measure to prevent any higher-than-usual demand flowrates. Worst-case issue was 7 minutes of 1.5 NTU water left the filters and entered the clearwell. While this is close to an 'IFE Trigger' requiring a filter assessment, it is not. And it would not be a violation, nor a public notice requirement if it had tripped that Trigger. And since it occurred as a result of a separate monitoring device malfunction - not poor filtration practices - even a filter assessment is not needed to resolve this issue. It is more of an emergency preparedness issue for when malfunctions occur, than any concern with filtration practices. No action needed regulatorily. (Turbidity monitoring equipment failure began the concern, so that will be reviewed, too.) Pete reviewed the 2019 Tracer Study to find that while there was a short drop below the minimum tank level, the other factors, provided more than enough contact time and CT to disinfect the water. Operators must consider whether to do another tracer study at a lower minimum tank level if the water level is expected to fall below it again. |
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