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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00722
PWS Name:	HILAND WC - BOULDER CREEK

Who Was Contacted and Phone:	Silas Olson (503) 537-4504
Contact Date:	01/29/2013
Contacted By:	MACPHERSON, JAMES (REGION 2)
Contact Method/Location:	Office

Assistance Type:	PLAN REVIEW
Reasons:	SWTR None

Details:	SUMMARY: Contact time DETAILS: Hiland proposes to install 8 inch pipe in a serpentine pattern to provide ~1,500 gallons of water between the treatment facility and the storage tank. This would generate a CT of 30 for a peak hourly flow rate of 50 gpm (anticipate actual flow at 30-35 gpm) at 6 C and chlorine residual of 1.0 mg/L for 0.5-log Giardia treatment. This is a valid means to generate contact time. It does not include contact time obtained from the reservoir. Hiland will send a written explanation of the proposal to add to the plan review #2010-115. ACTION NEEDED: none