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Town engineers say siphon adjustment quelled high BOD/TSS readings; grease blockage likely caused Alpine Court overbilling
Summary
Staff reported closing a 10-inch siphon to route low flows through a 14-inch siphon, which reduced BOD/TSS spikes. A separate manhole grease buildup in Alpine Court produced inflated meter readings; staff are seeking a credit from Manchester pending formal meter comparison.
Town engineering staff briefed the Water and Sewer Advisory Committee on elevated biochemical oxygen demand (BOD) and total suspended solids (TSS) readings that had been appearing in billing and monitoring data. Staff described how daytime high flows were overflowing a 10-inch siphon into a 14-inch siphon; during lower-flow periods solids settled and later produced concentrated 'slugs' of high BOD/TSS when flows resumed.
To reduce that effect the staff…
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