OHA Drinking Water Services
Contact Report Details |
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| 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 |
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| 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. | ||