OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00055
Who Was Contacted and Phone: John Wesely (503) 325-3524
Contact Date: 10/18/2006
Contacted By: SALIS, KARI (DWP)
Contact Method/Location: Office
Reasons: Coliform
Details: SUMMARY: TC+ response / possible cause & remedy #1 DETAILS: John Wesely called to let us know that more repeats came back TC+, FC-. They know they violated the MCL and will be doing a public notice. He also told me the suspected source of the problem is a smaller tank at the outlet of Reservoir #3 (an open reservoir). Water loses chlorine residual in Reservoir #3, water flows into this smaller tank (which perhaps serves the purpose of maintaining pressure if they were to ever by-pass Reservoir #3), is then booster chlorinated, and the pipe branches off, one to Reservoir #2, and others to service connections. This tank is below grade, in a dark environment. It was inspected and found to have a thick layer of slime on the inside of the tank. HBH helped determine some possible actions, and suggested installing a light to minimize this type of growth, and to have a diver vaccuum off the slime. A main problem is that this tank cannot be by-passed currently. If it is shut off, half the system loses water service, which of course if undesirable. Since it is not chlorinated, vaccuuming off the slime would potential mix things up, not provide any contact time, and some contamination could flow into the system. ACTION NEEDED: see #2

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System Info :: Report for Lenders :: Alerts :: Violations :: Compliance & Enforcement :: Contacts & Advisories :: Site Visits :: Public Notice
Coliform Summary :: Coliform Results :: Sampling Schedule for Coliform :: Groundwater/GWUDI Source Details :: Plan Review :: Annual Fee
Chemical Group Summary :: Latest Chemical Results :: Entry Point Detects :: Single Analyte Results 
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Lead & Copper :: Corrosion Control (LCR) :: Nitrate :: Arsenic :: Radionuclides :: GWR 4-Log :: LT2 :: Cyanotoxins :: PFAS
DBPs :: TOC & Alkalinity :: DBP Sample Sites :: FANLs :: MRDL :: Turbidity :: SWTR :: RAA :: LRAA For SDWIS: 3873