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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00202
PWS Name:	COLTON WATER DISTRICT

Who Was Contacted and Phone:	Pete Dostert (503) 824-2500
Contact Date:	06/04/2009
Contacted By:	POTTS, JOHN (DWP)
Contact Method/Location:	Field

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

Details:	SUMMARY: Tracer Study preliminary visit DETAILS: PWS and Water District have entered into a Bilateral Agreement that requires the District to conduct a CT Study to determine chlorine contact time prior to the first user. The tracer study must be completed before September 30, 2009. I met with Peter to conduct a pre tracer study inspection to verify what equipment was installed, chlorine injection system, sample taps, computer tracking/recording capability, etc. Issues that I identified that must be resolved are: no sample tap after chemical injection to measure chlorine dosage, no flow meter installed after the contact chamber to gather flow data , and difficult to determine gas chlorine dosage. I suggested he install the sample tap and flow meter. I discussed these issues with Rob Henry, HBH Consulting, for suggestions and comments and faxed him a schematic of WP and piping layout. ACTION NEEDED: Conduct tracer study after Pete installes flow meter and sampling tap.