OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00922
Who Was Contacted and Phone: Burch, Jeffery (503) 429-6921
Contact Date: 05/06/2013
Contacted By: HENRY, ROBERT (DWP)
Contact Method/Location: Field
Reasons: N/A
Details: SUMMARY: CT Tracer Study DETAILS: The City of Vernonia has a SW treatment plant which pulls water from Rock Creek. The surface water is treated with rapid sand filters with flocculation along with soda ash & chlorine is used to treat the water. The plant is able to produce as much as 700 gpm, with 900 gpm being delivered from the clearwell. Chlorine contact is achieved in an approximately 30,000 gallon clearwell before the water is sent to the distribution system (and first user). The CR was contacted by the City to provide assistance with a CT study. A previous effort was made at a contact tracer test, but operational changes were needed for a successful test. Completed draft report for flows at 700 in & 910 out. Coordinated with James Nusrala & City regarding testing at reduced flows. Performed additional tracer testing at reduced treatment plant flow rate. Collected tracer testing data at further reduced service pump flow (680 gpm out). ACTION NEEDED: Complete tracer study report.

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