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OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00042 | ||
| PWS Name: | ANTELOPE, CITY OF | ||
| Who Was Contacted: | Dan Vaage | ||
| Contact Phone: | 541-982-4372 (Email address hidden) | ||
| Contact Date: | 08/24/2021 | ||
| Contacted By: | BAILEY, NICOLE (WASCO COUNTY) | ||
| Contact Method/Location: | |||
| Assistance Type: | OTHER WATER QUALITY - Circuit Rider Follow Up | ||
| Details: | The circuit rider made a site visit and discussed the water system’s issues at length. The issue with the fluctuation in the chlorine residual is likely rooted in the fact that an incorrect test kit is being used, along with an un-diluted sodium hypochlorite mix with very slow pump feed rates. The circuit rider recommends that the water system use a HACH Pocket Colorimeter II or similar testing device (HACH DR300) to more accurately monitor the chlorine residual in distribution. Further, we recommend that the operator dilute the chlorine mix 10:1 with water and “turn-up” the chlorinator as needed to match the dilution. Currently the operator is using straight 6.25% hypochlorite with settings of 18% for both the stroke length and speed on the chemical dosing pump. A residual of 0.30ppm was measured at the kitchen sink of the Adams residence. The circuit rider recommends running a 10:1 mix in the 55 gallon day tank, at this dilution we estimate that (if linear) the chemical dosing pump should be set at ~60% on both stroke length and speed. The circuit rider provided a hardcopy spreadsheet for day tank mixing that shows the amounts of chlorine and water that need to be added to top off the tank for any given starting tank level from 0-50 gallons. |
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