OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00585
PWS Name: OCEANSIDE WATER DISTRICT
 
Who Was Contacted: David Nordman
Contact Phone: 503-842-6462 (Email address hidden)
Contact Date: 05/30/2019
Contacted By: HOFELD, EVAN (DWP)
Contact Method/Location: Email
 
Assistance Type: WATER QUALITY ALERT RESPONSE
Reasons: Disinfection Byproducts
 
Details: I received an alert on 5-28-19 for a single TTHM result over the MCL. Although the single result was over the 0.080 mg/l TTHM MCL, the locational running annual average (LRAA) was below the MCL and no OEL was exceeded. Since the system was already on quarterly monitoring, no further action was needed. This was communicated via e-mail on 5-31-19 and a spreadsheet showing the compliance calculations was e-mailed to Mr. Nordman on 5-31-19 showing that the 0.0852 mg/l TTHM result from sampling at the "Cape Manager's Home" on 5-14-19 resulted in a TTHM LRAA of 0.0609 mg/l and TTHM OEL of 0.0257 mg/l for the 2nd quarter of 2019. We later spoke on the phone about some elevated TOC levels they observed, the need for TOC removal to address DBP formation, and plans to investigate alternative coagulants such as ACH, which is a coagulant commonly used by coastal membrane plants that appears to work well (e.g. Arch Cape and Warrenton among others). I recommended he work with the membrane manufacturer prior to making any coagulant changes.
 
Associated Alerts: CHEM8335 - 05/28/2019 - TTHM



More information for this water system: SDWIS ID 3980
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