OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 94489
Who Was Contacted: Bobby Henderson
Contact Phone: 541-251-0427
Contact Date: 03/05/2020
Contacted By: PARRY, BETSY (DWP)
Contact Method/Location: Phone
Assistance Type: OTHER REGULATORY - Filter Pressure Gauges & Function
Reasons: Operations
Details: The pressure readings on the gauges in the filter train have been puzzling for a long time. The Circuit Rider, Jared Sylvester, and I were analyzing the handwritten data of measurements before and after each filter at both treatment sheds from November and December 2019, and they just did not make sense. (For example, how could the pressure before the first filter be lower than it is after other filters without any other pumping in between? And how could the pressure before the Harmsco filter go up and down within a month without changing out the filter?) Staff were changing the Harmscos very rarely, around once every 6 months, and the psid measurements were not reliable to go by. (They changed the prefilters based on time as well - the first one, the "bag," weekly, the 2nd "cartridge" monthly.) Before the Circuit Rider went there, local staff Robert (Bobby) Henderson changed out all of the pressure gauges, pre-filters and Harmsco filters at both plants on January 28, 2020. In February, the psid at the Harmscos increased dramatically within just one month - from a psid of 6 to 28 at the lower plant (and it must be changed out at 30), and from 3 to 19 at upper shed.

I spoke to Bobby Henderson on March 5th. He had again changed out all the filters, including the Harmscos. He said the March data should be a better indicator of how things are doing than February, because he was away much of February and the prefilters were not changed as often - they looked dirtier this time than when he usually changes them. Perhaps that is why the Harmsco psids increased so much in February? (But then why were the psids across the prefilters so small - next to nothing?) Bobby also addressed a concern Jared Sylvester had had about the bag filters - the Pentek housings DO contain baskets to support the bags, and are secure in there.

Manager Corinne later sent me make and model numbers for all the filter and housings, which I shared with Jared the Circuit Rider.

More information for this water system: SDWIS ID 1791
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