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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00851
PWS Name:	SWEET HOME, CITY OF

Who Was Contacted and Phone:	Tim Sanders (541) 367-4846
Contact Date:	04/06/2012
Contacted By:	MACPHERSON, JAMES (REGION 2)
Contact Method/Location:	Office

Assistance Type:	PLAN REVIEW
Reasons:	SWTR Chlorine

Details:	SUMMARY: Required Giardia log inactivation DETAILS: Recent updating of the SWTR monthly report form resulted in confusion over the required Giardia log inactivation with which the new plant is credited. The old plant needed 1.0-log, but the presumed requirement for the new plant which has coagulation and flocculation through contact clarifiers is 0.5-log. Since the new plant is effectively conventional filtration, it is logical that it would have 2.5-log filtration credit and only need 0.5-log inactivation for Giardia. ACTION NEEDED: Check the files for mention in the plan review on the required log inactivation with chlorine.