OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 94601
Who Was Contacted: Michael Kelsey
Contact Phone: 503-263-3000
Contact Date: 04/06/2021
Contacted By: NUSRALA, JAMES (DWP)
Contact Method/Location: Phone
Assistance Type: OTHER REGULATORY - Follow up to arsenic MCL exceedance
Reasons: Arsenic
Details: Michael briefed me on the follow up to the running annual average for arsenic of 0.013 mg/L, that exceeded the 0.010 mg/L MCL, for the 4-quarter period ending with 2nd quarter 2020.
-meeting with circuit rider in September was helpful to frame what questions to ask as systems selects proposed treatment alternative.
-When Mike reached out to Shiloh Water to discuss treatment plans, Shiloh had a question if treatment was really needed for such a slight exceedance of the MCL
-System has run speciation tests on arsenic with Shiloh to determine most of the arsenic is arsenic V rather than arsenic III.

I reminded system that even with subsequent test results below the MCL, treatment is required when the 4-quarter running annual average exceeds the MCL. Mike will contact Shiloh again to get help putting together a plan submittal for treatment for DWS review.
Associated Violations: Viol #903496710, 04/01/2020 - 06/30/2020: ARS - Chemical MCL based on Average of Samples

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