OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00055
Who Was Contacted and Phone: Gary McLauchlin (503) 325-3524
Contact Date: 12/29/2009
Contacted By: HOFELD, EVAN (REGION 1)
Contact Method/Location: Office
Reasons: Disinfection Byproducts
Details: SUMMARY: Single result above the HAA5 MCL DETAILS: Gary McLauchlin called to verify if they needed to issue a public notice or take further action after a DBP sample taken 12/10/09 resulted in a single result of 0.1039 mg/l for HAA5, above the MCL of 0.060 mg/l. I told him that since the MCL is calculated based upon a running annual average, no further action was needed at this time, other than to report the result in the 2009 CCR. I asked if he knew what may have caused the high result and he theorized that it may have been due to tannins in the source water, due to a noticeable drop in pH and a need to increase the chlorine dose to maintain the same residual. ACTION NEEDED: Report the result in the 2009 CCR. No further action needed at this time. System is in the process of covering open reservoirs, which is thought will help mitigate DBP formation in addtion to meeting LT2 requirements.
Associated Alerts: CHEM3871 - 12/18/2009 - TOTAL HALOACETIC ACIDS (HAA5)

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DBPs :: TOC & Alkalinity :: DBP Sample Sites :: FANLs :: MRDL :: Turbidity :: SWTR :: RAA :: LRAA For SDWIS: 3873