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Oyster Pond watershed plan shows IA upgrades alone likely won’t meet TMDL; committee debates credits and sewers
Summary
Town watershed staff presented a proposed IA geoboundary for Oyster Pond and said using the conservative 10 mg/L credit for advanced systems would yield roughly 608 kg nitrogen reduction but fall short of MEP/TMDL targets (≈1,071 kg); committee members and residents discussed whether higher‑performing ‘enhanced IA’ approvals or sewering would be required.
Town watershed staff (Kristin) presented a draft geoboundary and nitrogen accounting for Oyster Pond, explaining why different data sources (MEP, TMDL summary table and the Cape Cod Commission’s MVP tool) show divergent loading estimates for the watershed.
Using a conservative planning assumption — that approved IA systems receive credit at the regulatory performance level of 10 mg/L — the town’s analysis shows upgrading IA systems across the watershed would reduce…
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