OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00854
Who Was Contacted: Matt Grassauer
Contact Phone: 541-972-1859
Contact Date: 09/18/2019
Contacted By: DANIELS, BRAD (DWP)
Contact Method/Location: Phone
Compliance & Enforcement: Other Compliance Schedule: 07/09/2019 - 09/27/2019
Reasons: Disinfection Byproducts
Details: I called and left a message for Matt, explaining that I mailed a letter in July because disinfection byproducts are over the MCL at the water system. In the message, I stated DWS has not received the required public notice that was due in August. I asked for a return call to confirm the notice was issued or at least to make sure it's issued now. I also reminded Mr. Grassauer that DWS must receive a written plan describing how the contamination will be permanently resolved even though he has discussed this over the telephone with Jay MacPherson.

Mr. Grassauer returned my call and explained plans to convert the filtration for the water system from cartridge to slow sand and also to have a tracer study conducted. There is also a layer of organic sediment at the bottom of the system's water storage facility. We discussed the possibility that changing the filtration method could reduce dissolved organic matter or that the tracer study could reduce the formation of DBPs. We also discussed the likelihood that the material in the storage tank is contributing to DBP formation and agreed it's a good idea to discuss methods of removing organics with Civil West engineering. Lastly, these corrective measures won't be completed until October or November and Mr. Grassauer questioned the value of collecting DBP samples in September. I informed him that the water system will likely receive a violation for exceeding the DBP MCL regardless of whether samples are collected or not because of the way the average concentration is calculated. I stated failing to monitor in September would simply add another violation but DWS wouldn't take any enforcement action due to the failure to report one round of samples.
Associated Violations: Viol #2670369, 04/01/2019 - 06/30/2019: DBP - Chemical MCL based on Average of Samples

Viol #2670364, 02/01/2019 - 02/28/2019: SWTR - Public Notice Late/Nonreporting

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DBPs :: TOC & Alkalinity :: DBP Sample Sites :: FANLs :: MRDL :: Turbidity :: SWTR :: RAA :: LRAA For SDWIS: 2021