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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00205
PWS Name:	COOS BAY NORTH BEND WTR BRD

Who Was Contacted:	Jeff Miller
Contact Phone:	541-267-3128 (Email address hidden)
Contact Date:	08/03/2023
Contacted By:	DOWNS, KENT (DWP)
Contact Method/Location:	Email

Assistance Type:	MONITORING
Reasons:	SWTR Operations

Details:	Turbidimeter calibration 08.03.2023- Turbidimeters must be calibrated per manufacturer instructions, or at least quarterly. Jeff reported that the system has 9 turbidimeters. 3 of those turbidimeters are HACH 1720 E series that are calibrated in house. The other 6 turbidimeters are new HACH TU5300. There is a contract with HACH to service and calibrate the new units, but they missed calibrating the units during the 2nd quarter of this year. Jeff informed me that the calibration was completed today. Turbidity readings prior to calibration and after calibration didn't vary significantly. No further actions needed at this time.