OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00805
Who Was Contacted: Tony Cavan
Contact Phone: 971-320-0249 (Email address hidden)
Contact Date: 10/11/2019
Contact Method/Location: Phone
Reasons: Coliform
Details: Left voice mail for Tony reminding him that repeat samples need to be drawn at Pump House and 2 other repeat sites, if not already done. Also asked for clarification as to whether alert sample was "before" or "after" chlorine.

Sent followup e-mail after violation alert for Late/Nonreporting: "Positive coliform hits seem to keep happening up there at the well and distribution test sites. Some repeat samples didn’t make it to the lab before an alert for missed samples popped up in the system. If you have NOT already submitted repeat samples in response to the Oct 9 WELL, and Oct 10 DIST-A TC+ results, it’s fine to just submit your November samples as usual. Keep an eye on the results and get all repeats done if any Nov. sample come back positive (Data Online “Sampling Schedule for Coliform” is really helpful for your specific up to the minute requirements).

I chatted with our OHA engineer, Pete Farrelly today to get some advice about the persistent TC+ hits. He suggested the following: If after the Level 2 investigation in July you went to sampling straight from the tap and not the hose, yet keep getting positive TC, try increasing chlorine, aiming for a residual of 1.0 ppm at entry point to the distribution system. Currently, it appears you’re getting a residual of around 0.1 ppm, which is half of the minimum we’d like to see. If after a few sample cycles the results are coming back TC absent, you can back off the chlorine a bit and maintain a residual of around 0.5 ppm. Hopefully, the boost in disinfection will root out and eliminate the source."
Associated Alerts: COLI19407 - 10/10/2019 - COLIFORM (TCR)

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