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OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00556
Who Was Contacted: David Hancock
Contact Phone: 971-241-7203 (Email address hidden)
Contact Date: 01/06/2023
Contacted By: HOFELD, EVAN (DWP)
Contact Method/Location: Phone
Reasons: Lead or Copper
Details: I received an alert on 1/6/23 for 4 days in December 2022 (12/9 - 12/12) in which the minimum pH of 7.4 was not met (i.e., 4 excursions). I e-mailed David Hancock in the morning and followed up with a phone call and subsequent e-mail later in the day. David said when the spring is placed into service, which is done typically only when the surface water source has high turbidity, they have trouble adjusting the soda ash dose to account for the difference in source water quality. He thought that perhaps the pumps were undersized. We went over the need to sample every day following an excursion until the pH met the minimum requirement (pH of 7.4), some common issues with pH controls (in this case they adjust the soda ash manually without any automation), and that lead and copper tap sampling increases to once every 6 months at 20 sites (as opposed to once every 3 years at 10 sites) following more than 9 excursions in a 6-month period. In this case, since the excursion happened in December, it is believed that the next 6-month period would start over 1/1/23. I followed up with an e-mail containing some information on automated control loops and contact information for Dan Vaage with Civil West (the SRF technical assistance circuit rider) and that I would work on establishing a minimum alkalinity level for their existing corrosion control system (recent results indicate alkalinity is maintained at about 40 mg/l as CaCO3).
Associated Alerts: LCRE32203 - 01/05/2023 -

More information for this water system: SDWIS ID 3976
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