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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00200
PWS Name:	COBURG, CITY OF

Who Was Contacted and Phone:	Jack Harris (541) 682-7856
Contact Date:	08/15/2007
Contacted By:	PARMENTER, AMY (REGION 2)
Contact Method/Location:	Office

Assistance Type:	OTHER REGULATORY - REGULATORY ASSISTANCE
Reasons:	Chlorine None

Details:	SUMMARY: Chlorine residual DETAILS: I told Jack that due to the results of the Tracer Study performed by HBH Engineering (see previous contact reports) and the theoretical calculation of Contact Time based on plugged flow characteristics, it was determined that the City of Coburg would need a minimum chlorine residual of 0.74 mg/L at the first user or it can add storage or continue the on-going monthly coliform samples at the wells for 12 months to prove that chlorination is for residual maintenance purposes only. Jack said he will continue the monthly coliform samples, which he started in March, and he may boost the chlorine up to 0.74 in the meantime. ACTION NEEDED: Await results of the 12 months of raw-water coliform samples (ending in March 2008).