OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00566 | ||
| PWS Name: | NEWPORT, CITY OF | ||
| Who Was Contacted and Phone: | Steve Stewart (541) 265-7421 | ||
| Contact Date: | 02/06/2008 | ||
| Contacted By: | KELLEY, KAREN (REGION 2) | ||
| Contact Method/Location: | Office | ||
| Assistance Type: | WATER QUALITY ALERT RESPONSE | ||
| Reasons: | Disinfection Byproducts N/A |
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| Details: | SUMMARY: DBP monitoring increase from annual to quarterly. DETAILS: I received an alert for TTHM sampled 9/12/07 in October 2007. At the time, I used the 9/07 and 3/07 sample results to calculate the running annual average at 0.055 mg/L, which allowed Newport to remain on an annual sampling schedule for Stage 1 DBPs. I recently found out that I cannot use the 3/07 sample results in the calculation because they were quarterly results instead of annual results. As such, the newly calculated RAA for the 9/07 results is 0.078 mg/L which triggers monitoring to return to quarterly. I sent Steve Stewart an email notifying him of the schedule change. Next DBP Stage 1 sample results must be collected during 1st quarter 2008 from at least one location representing the maximum chlorine residence time. I also updated sdwis to show the quarterly schedule beginning in 2008. ACTION NEEDED: None. | ||