OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00537
Who Was Contacted: Matt Johnson
Contact Phone: 503-838-2173
Contact Date: 05/02/2021
Contacted By: SALIS, KARI (DWP)
Contact Method/Location: Phone
Reasons: Operations
Details: Matt called Sunday, May 2 at 9am to report that the chlorinator for Well #5 went out sometime around 1 am until 8 am. the well is believed to be chlorinated for residual maintenance (based on TC- at the well) and produces about 75 gpm. The other wells on the entry point (including a GWUDI well) were not running during that time. The well does not feed into a storage tank so the unchlorinated water likely stayed within a few block radius from the well. We discussed next steps, and he and his crew were going to flush water out of the area through hydrants while others checked chlorine residual to define the boundary of lower residual water. Their baseline is 0.8 ppm. Once flushed, they will turn on the other wells with chlorinators while repairing the well #4 chlorinator. We agreed Matt would contact me if things did not go as discussed. I did not hear from him again that day.

Some information regarding chlorinators may not be consistent with the schematic on file so follow-up is necessary.

Alert Update (5/3/21): Spoke with Matt about chlorine equipment failure at Well 5 on Sunday. He thinks the failure was caused by a large bubble in the chlorine feed line. Well 5 is not proportional to flow so non-chlorinated water went into the transmission line between Well 5 and the entry point. Well 5 was shut down and the transmission line back flushed through a hydrant. Chlorine residuals in distribution beyond the entry point were checked and the lowest residual measured at 0.63 ppm. The 1.2 MG 4th Street storage reservoir, located before the entry point, was not serving water at the time. It feeds off the other reservoirs in distribution which were full. Matt will troubleshoot the chlorination equipment issue today with plans to reactivate Well 5 tomorrow if all goes well. No further action at this time

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