|
|
| Introduction :: Data Search Options :: Water System Search :: DWS Home :: DWS Rules |
OHA Drinking Water Services
Contact Report Details |
|||
| PWS ID: | OR41 00055 | ||
| PWS Name: | ASTORIA, CITY OF | ||
| Who Was Contacted and Phone: | Jim Hatcher (503) 325-3524 | ||
| Contact Date: | 06/16/2014 | ||
| Contacted By: | HOFELD, EVAN (REGION 1) | ||
| Contact Method/Location: | Office | ||
| Assistance Type: | WATER QUALITY ALERT RESPONSE | ||
| Reasons: | Disinfection Byproducts Operations |
||
| Details: | SUMMARY: OEL Exceedance for HAA5 - 2Q2014 DETAILS: With the May 7, 2014 disinfection byproducts sampling results, the Operational Evaluation Level (OEL) for HAA5 was exceeded for Astoria with an OEL for HAA5 of 0.061 mg/l for the 1st and D sample location. The Locational Running Annual Average for HAA5 at that location was 0.043 mg/l. In response to the OEL exceedance, Astoria submitted an Operational Evaluation to our office, received on July 17, 2014. The OEL report was approved in a letter dated 7/30/14. Future steps to reduce DBP formation that were identified in the Operational Evaluation include the following: 1. Increasing automatic flusher timers in areas with high HAA5’s-- 2. Evaluting use of existing sources that changes with seasonal changes in raw water quality-- 3. Evaluating development of a new source of supply (Spur 14) such that water can be supplied by Spur 14 to the slow sand plant-- and 4. The City will also continue to work with CH2M Hill on developing strategies to lower DBP formation in the distribution system. ACTION NEEDED: City to continue to evaluate solutions to mitigate elevated HAA5 levels. | ||
| Associated Alerts: | CHEM6291 - 05/19/2014 - TOTAL HALOACETIC ACIDS (HAA5) CHEM6291 - 05/19/2014 - TOTAL HALOACETIC ACIDS (HAA5) |
||