OHA Drinking Water Services
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Contact Report Details
PWS ID: OR41 00882
PWS Name: OCEANSIDE WD - CAPE MEARES
 
Who Was Contacted: David Nordman
Contact Phone: 503-842-6462 (Email address hidden)
Contact Date: 08/22/2022
Contacted By: HOFELD, EVAN (DWP)
Contact Method/Location: Email
 
Assistance Type: WATER QUALITY ALERT RESPONSE
Reasons: Disinfection Byproducts
 
Details: I received an alert for a single TTHM result sampled at the Cape Meares Community Center (site ID 2DBP-02) on 8-16-22 which was measured to be 0.0866 mg/l. I e-mailed both David Nordman and Christian Anderson (osidewaterchristian@gmail.com) on 8-22-22 letting them know that although the locational running annual average (LRAA) did not exceed the 0.080 mg/l MCL for TTHM, the 0.080 mg/l Operational Evaluation Level (OEL) was exceeded at 0.0869 mg/l. I requested an OEL report addressing the possible cause and corrective actions taken to address the elevated TTHM result to be submitted within 30-days and provided links to the OEL report template and information on our website at:https://www.oregon.gov/oha/ph/healthyenvironments/drinkingwater/rules/stage2/pages/opeval.aspx. Although results for the Oceanside system (PWS ID 00585) were not yet visible on data-online, I also mentioned the possibility of an OEL exceedance for Oceanside, which would require a separate OEL report.

OEL and LRAA calculations are shown below:
TTHM OEL exceeded at 0.0869 mg/l:
((2 x 0.0866) + 0.0971 + 0.0773)) / 4 = 0.0869
TTHM LRAA = 0.076225 mg/l
(0.0866 + 0.0971 + 0.0773 + 0.0439) = 0.076225

8/24/22 Update - I e-mailed David Nordman and Christian Anderson that the TTHM OEL was also exceeded for Oceanside (00585) with the TTHM OEL calculated to be 0.082 mg/l.

10/28/22 Update - OEL report was received on 10-28-22 and indicated that construction for Cape Meares Loop road crosses Coleman Creek upstream of their impoundment, which resulted in turbidity spikes and likely elevated organics. During construction the creek had to be diverted from its normal creek bed while the construction of the culvert and road base was being installed. Operators increased communication with construction crews, shut the plant down at night, and increased their coagulant dose to remove more organics.
 
Associated Alerts: CHEM9863 - 08/22/2022 - TTHM


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