Posted on January 3, 2022 by mwalker

WATER – A total of 34,701,002 gallons of water were treated and delivered during November. 12,783,000 gallons from Alder Creek treatment plant; 7,414,000 gallons from Brownell Springs and 14,504,002 gallons purchased from City of Portland. Peak day production was 1,076,535 gallons on November 14th. 13.56 inches of rainfall were recorded at the water treatment plant site during the month with a peak of 2.6 inches on the 11th during the atmospheric river storm event over Veteran’s Day weekend. We lost SCADA communications at Brownell Springs and the water treatment plant during the storm event which caused us to take more water from the Portland Water Bureau source on the 14th.

WASTEWATER – A total of 51,600,000 gallons of sewage were treated and discharged to Tickle Creek beginning October 31. Maximum flow was 3.73 MGD on the 12th (rainfall was 0.8 inches on the 11th and 2.0 inches on the 12th). Monthly rainfall recorded at the plant was 9.2 inches with a peak of 2.0 inches on the 12th during the atmospheric river storm event over Veteran’s Day. The plant performed well during this event. Veolia staff were able to keep all the biomass in the system without washing out the clarifiers. 609,610 gallons of sludge were dewatered, processed and landfilled during the month. Monthly Average Effluent BOD was 8.25 mg/l. Monthly Average Effluent TSS was 6.3 mg/l. Monthly average permit limits are 10 mg/l for BOD and TSS. We had a daily exceedance for ammonia due to the lack of MLSS return pumps at startup which prevented the plant from operating in nutrient removal mode. We also had a daily exceedance for total coliforms due to the failure of the primary coolant pump and the backup coolant pump relay in the UV disinfection system.

Slayden and Veolia staff continued working on levelling effluent weirs in Clarifier #2. Temporarily draining the clarifier basin and tightening bolts on the weir supports seemed to address the issue. Main line bursting, service line replacement and lining continued in November. All manhole grouting was completed during the month of November. Supply chain issues with liner materials delayed the completion of some smaller diameter private service lateral lining.

STREETS – The City’s street sweeping contractor devoted 155.4 hours to sweeping streets, covering 506 travel and lane miles and collecting and disposing of 178 cubic yards of debris, mainly consisting of leaves.

STORMWATER – City staff responded to localized street flooding calls and removed debris from catch basin drains and stormwater facilities during the larger storm events in November.