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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00394
PWS Name:	IDANHA CITY WATER

Who Was Contacted and Phone:	Greg Benthin
Contact Date:	02/05/2014
Contacted By:	MACPHERSON, JAMES (REGION 2)
Contact Method/Location:	Office

Assistance Type:	SURVEY/DEFICIENCY FOLLOW-UP
Reasons:	SWTR None

Details:	SUMMARY: CT calc given backwash flows DETAILS: How should CT be calculated before the next tracer study? The last survey noted the tracer study was based on maximum demand (250 gpm), but that backwash creates a flow of 600 gpm. Thus, a new tracer study should be conducted while backwash is occurring. Until that time, Idanha should use the current contact time base on the last tracer study. Idanha has asked HBH for support in conducting a tracer study. ACTION NEEDED: none