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OHA Drinking Water Services Contact Report Details
PWS ID:	OR41 00869
PWS Name:	THE DALLES, CITY OF

Who Was Contacted and Phone:	Ken Rawson (541) 298-2248 ext. 5000
Contact Date:	06/23/2011
Contacted By:	GOSS, BILL (DWP)
Contact Method/Location:	Office

Assistance Type:	OTHER REGULATORY - REGULATORY ASSISTANCE
Reasons:	SWTR N/A

Details:	SUMMARY: Review of Tracer Study Results DETAILS: The 250,000 gallon clearwell is offline for maintenance, so only the 4.3 MG clearwell is in use, and a new tracer study is warranted. Ken sent the results of a tracer study conducted 6/21 - 22. The sampling at the clearwell outlet missed the tracer (fluoride) breakthrough, so a second tracer study will be conducted in a couple days. Recommended turning off the fluoride and waiting until it was non-detect at the clearwell outlet, then starting the study with a dosage of 0.7 mg/l and take measurements until 0.07 mg/l was achieved at the outlet. ACTION NEEDED: PWS to submit tracer study results.