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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00257
PWS Name:	DETROIT WATER SYSTEM

Who Was Contacted and Phone:	Bob Bruce (503) 854-3496
Contact Date:	05/31/2008
Contacted By:	ERBELE, HANK (DWP)
Contact Method/Location:	Field

Assistance Type:	CIRCUIT RIDER ASSISTANCE
Reasons:	N/A N/A

Details:	SUMMARY: Perform Ct Tracer Study DETAILS: A new Ultrasonic flowmeter was installed on the system’s 210,000 gallon storage reservoir outlet piping. A CT Tracer Study was requested to determine the current disinfection contact time. I drafted disinfection flow chart, tracer study worksheet and theoretical contact time. CT Tracer Study was performed on 5/6/08. I collected and evaluated data to establish disinfection contact time for the water treatment system. ACTION NEEDED: Complete Tracer Study report.