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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00681
PWS Name:	OCHOCO WEST WTR & SAN AUTHORITY

Who Was Contacted and Phone:	Elsa Hyder (541) 447-1934
Contact Date:	04/16/2010
Contacted By:	HENRY, ROBERT (DWP)
Contact Method/Location:	Field

Assistance Type:	CIRCUIT RIDER ASSISTANCE
Reasons:	N/A N/A

Details:	SUMMARY: Arsenic Levels Exceeding MCL DETAILS: System owns and operates a domestic water system consisting of five springs and a large well that serves 147 active connections. The five springs feed into a single transmission line that discharges into an 11,000 gallon cistern. From here the water is chlorinated and pumped up the hill to two storage tanks with a combined storage of 185,000 gallons. From this point, the system is gravity fed through 8 inch and 6 inch pipes. The well produces 150 gpm with 50 gpm going to treatment and 100 gpm getting bypassed. System currently exceeds the MCL for arsenic in their well. The springs no longer can meet the demand needed to dilute the well source to maintain a delivered product below the MCL. HBH was contacted by Russ Hanson to provide assistance. I recommended raw water testing protocol to allow the system to design a proper arsenic removal system. I composed preliminary recommendation report and cost estimate for the removal of arsenic based on an assumed technology (oxidation followed by greensand filtration). Report also discussed management practices to reduce surface contamination of the springs. Contact tracer testing was recommended to determine compliance with the Groundwater Rule. ACTION NEEDED: Continue to coordinate with system and County Health Department staff. Perform Contact Tracer testing.