|
|
| Introduction :: Data Search Options :: Water System Search :: DWS Home :: DWS Rules |
OHA Drinking Water Services
Contact Report Details |
|||
| PWS ID: | OR41 01139 | ||
| PWS Name: | MIDLAND WATER ASSOCIATION | ||
| Who Was Contacted and Phone: | Phil White (360) 560-0248 | ||
| Contact Date: | 01/16/2015 | ||
| Contacted By: | NUSRALA, JAMES (REGION 1) | ||
| Contact Method/Location: | Office | ||
| Assistance Type: | OTHER REGULATORY - REGULATORY ASSISTANCE | ||
| Reasons: | SWTR Operations |
||
| Details: | SUMMARY: Disinfection interruption DETAILS: During a site visit on 1/14, it was determined that the chlorine feed pump was not injecting any chlorine in the feed line, due to a feed pump malfuction. Operator was unsure how long feed pump was not working. Feed pump repaired on 1/14 with solution being injected. Phil indicated that first user residuals had not dropped below the 0.6 mg/L alarm during this time, and that at least 8 feet of water was kept in the reservoir to ensure adequate contact time. During the visit the CL-17 chlorine analyzer began to malfuction. Grab samples taken by both Phil and DWS on portable instruments indicated at least a 1.0 mg/L first user residual. Phil collected grab samples at least twice a day on 1/14, 1/15, and 1/16, to document at least a 0.8 mg/L chlorine residual. It was decided that since adequate disinfection was occuring, that there was not a slug of undisinfected water that could be sent to the users, and the storage tank volume did not need to be drained. ACTION NEEDED: Phil to use the lowest value of grab samples of the day for CT calculations. Phil to order new photo cell for chlorine analyzer. | ||