Marbletown City Council Tells New York City Conservancy Prepares Catskill Aqueduct Repairs – Daily Freeman

ROSENDALE, NY – The New York City Department of Environmental Protection is preparing for community services needed when the Catskill Aqueduct goes offline for ongoing repairs on a 4.5-mile section that passes under Rondout Creek.

DEP project manager Emily Pereira told a meeting of the Marbletown Town Council on Tuesday that efforts will include supplying water to the High Falls Water District and following up on concerns property owners affected by changes in groundwater levels.

“We have been monitoring some wells in the area…and this basic well monitoring was started in 2019,” she said.

Under the Neighborhood Support Program paid for by the city but operated by the city, there would be relocation, replacement or improvements for private wells that are affected by high groundwater levels related to leaks in the aqueduct.

Pereira said program parameters will be determined by reports from the US Geological Survey of the scope and width of groundwater changes that would affect the properties. The presentation noted that information from the U.S. Geological Survey is expected to be ready in July 2023 and would report on “the magnitude and extent of the leaky aqueduct’s influence on aquifer systems.” The report is expected to include information from 48 wells and three surface water sites.

Officials added that there would also be a well monitoring program in place to detect the “presence of chlorine dioxide in drinking water wells near known leaks” in the tunnel. They said monitoring began in 2019, with chlorination of the Catskill Aqueduct due to begin next month.

City officials said assessments are still underway on the number of leaks along the tunnel, but they expect a Rondout tunnel repair plan to be ready in 2024 and would begin work no later than early in 2027. The report says a 2016 interior inspection of the tunnel found “11 confirmed leak locations, line cracks and two small piles of debris”.

The section will stretch from Pine Bush Road to Mossybrook Road, with officials unsure how long the work will take.

“It depends on the design of the repairs,” Pereira said. “We are still in the evaluation phase.”

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