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OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00252 | ||
| PWS Name: | DAYTON, CITY OF | ||
| Who Was Contacted and Phone: | Kurt (503) 864-2221 | ||
| Contact Date: | 09/14/2007 | ||
| Contacted By: | FARRELLY, PETER (DWP) | ||
| Contact Method/Location: | Office | ||
| Assistance Type: | WATER QUALITY ALERT RESPONSE | ||
| Reasons: | Coliform Operations |
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| Details: | SUMMARY: Boil Water Notice for E. coli routine positive followed by TC-positive repeat DETAILS: The TC+ repeat that followed an E.coli positive from a routine sample in the office break room put Dayton on a boil notice. Dayton notified Lafayette. Lafayette requested separation from the system. (Lafayette is running their auxiliary wells for the time being.) ACTION NEEDED: Notify Lafayette or turn off discharge pump to Lafayette Distribute Tier 1 Boil Notice with FAQ Test all raw sample ports from the sources (Label them "Specials") Increase chlorine residual to a minimum of 0.5 ppm Flush the system Assess where any leaks may be and if they can identify & isolate where these potential contamination points are SAMPLE STRATEGICALLY (Label them "Specials") after sampling sources, sample the WTP discharge, sample the influent & effluent of reservoirs, booster stations, etc. Try to isolate the contamination source (ultimate goal!) Once they are confident their sampling reflects no more contamination, take 4 "Routine" coliform samples Present the (negative) results to Gary or Pete and discuss potentially lifting the boil notice Lastly, 1 week from now, have a "Lessons Learned" meeting (maybe with Lafayette, too) to sketch out this protocol in detail and insert it into their ERP. |
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