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OHA Drinking Water Services
Contact Report Details |
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| PWS ID: | OR41 00540 | ||
| PWS Name: | MONROE, CITY OF | ||
| Who Was Contacted and Phone: | Dave Clayborne (541) 868-6741 | ||
| Contact Date: | 02/09/2009 | ||
| Contacted By: | POTTS, JOHN (DWP) | ||
| Contact Method/Location: | Field | ||
| Assistance Type: | CIRCUIT RIDER ASSISTANCE | ||
| Reasons: | N/A N/A |
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| Details: | SUMMARY: Tracer Study Preliminary Visit DETAILS: System has recently activated a new membrane WTP using the Long Tom River as a source. The previous source was ground water. The DWP is requiring a chlorine contact time tracer study. An effluent flow meter is installed after the clearwell-- however the 1 MG reservoir does not have an effluent flow meter. I met with Dave to conduct a pre tracer study inspection to verify what equipment was installed, chlorine injection system, sample taps, computer tracking/recording capabilities, etc. I reviewed the clearwell construction plan, as it is baffled. The WTP typically operates at 245 GPM at temperatures 4-14 C and 350 gpm at >15C. I decided to wait until raw water temps exceed 15 C to conduct the study at full operating capacity. Chlorine dosing will require conversion from mi/min to mg/l in order to determine T10. Current dosage is 20 ml/min by drawdown tube for a 1.1-1.2 mgl residual. Chlorine is gravity fed from the old WTP building using exciting equipment (poor design IMG) and dumped into clearwell near raw water intake for mixing. ACTION NEEDED: Contact Tracer Study | ||