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Engineer: proposal moves exposed sewer out of ditch, lowers main and 'armor' the channel
Summary
Drew Flaming of Commonwealth Engineers told the board the sanitary sewer main is exposed by erosion and recommended relocating a corner of the main, lowering the line under the ditch, and installing a tied concrete block mat system to protect the channel; staff and surveyor discussed whether work should extend beyond the town’s planned stopping point.
Drew Flaming of Commonwealth Engineers described field conditions and the engineering response proposed for the South Broadview/Newburgh reach. Flaming said erosion has exposed the sanitary sewer and that the plan is to relocate part of the main out of the ditch, lower the main at a critical bend and install a tied concrete block mat system—what he called "hard armor"—to protect the reconstructed ditch.
"So what we're proposing to do is to actually relocate part of the sanitary sewer main outside of the ditch and also lower the sewer main in 1 location and provide hard armor overtopping, which we call with a tied concrete block mat system to protect the the ditch," Flaming said. He initially described roughly 150 linear feet of proposed work along the ditch, but later clarified that the sewer main replacement itself would involve about 50 linear feet to move a dogleg and lower the pipe; the ditch reconstruction linear footage differs from the sewer replacement footage.
Engineers and the surveyor emphasized the work addresses active erosion that has already exposed pipe and threatens additional infrastructure. The surveyor said recent storm events substantially worsened head-cutting in the ditch and urged the board and town to consider extending reconstruction beyond the town’s original stopping point to ensure a durable repair that reduces the likelihood of repeat complaints.
