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UPDATE: Potomac Interceptor Repair February 10
Pumping capacity remains a challenge, due to ongoing maintenance and operational issues. An overflow occurred late Monday night, when two pumps – clogged with non-disposable wipes – were taken out of service for cleaning and maintenance. During a period of high flow, the volume of wastewater temporarily exceeded pumping capacity resulting in the overflow.
The overflow did not enter the Potomac River and was contained on-site by an earthen dam and a trench system that captured and redirected the wastewater back into the sewer system.
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UPDATE: Potomac Interceptor Collapse, February 9
DC Water and its contractors continue working around the clock, to operate, clean and maintain bypass pumps that divert wastewater around the damaged section of the Potomac Interceptor and return flows into the system further downstream. Despite these efforts, a significant overflow occurred late Sunday.
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Traffic Advisory: Emergency Lane Closures Due to Risk of Collapse—14th Street NW south of Thomas Circle
DC Water is taking emergency measures with the immediate and ongoing closure of all northbound lanes of 14th Street between L Street NW and Thomas Circle, due to the imminent risk of collapse posed by an abandoned, century-old, brick-lined sewer tunnel beneath the roadway.
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dc.water
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A significant overflow occurred overnight when multiple pumps were temporarily offline for cleaning and maintenance after becoming clogged by non-disposable wipes that were flushed into the system. This reduced capacity during a high-flow period. A smaller overflow earlier in the day was fully contained on site. Five new high-capacity pumps are being tested and may arrive this week to support additional bypass pumping and help prevent similar incidents. Construction on new bypass connections also continues. DC Water is preparing an Environmental Restoration Plan which is still in development and continues water quality sampling. Elevated E. coli at Lock 10 remains tied to snowmelt and residual wastewater and periodically impacted by overflow events. What this means: ✔️ Last night’s overflow happened because pump capacity temporarily dropped. ✔️ New pumps to support additional bypass pumping will make the system more stable. ✔️ Crews must finish the expanded bypass setup before rock removal can begin. ✔️ Drinking water is not affected. Details ▶️: https://www.dcwater.com/about-dc-water/media/news/update-potomac-interceptor-collapse-february-9
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