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Consultant demonstrates beta financial model to compare sewering, decentralized nitrogen‑removal systems
Summary
A visiting presenter demonstrated a beta model assessing lifecycle costs for sewering versus nitrogen‑removing on‑site systems, highlighting sensitivity to assumptions (cost per home, financing, assumed percent of load addressed) and urging varied financing strategies and public‑private partnerships.
Bruce Walton, an engineer who leads a regional water‑innovation task force, demonstrated a beta financial model to the Water Quality Management Committee on April 29 that compares the long‑term costs of centralized sewering and nitrogen‑removing (NR) on‑site systems.
"When you get through the process... it came out little over a $100,000 a home," Walton said when summarizing Barnstable data used for comparison, while noting that assumptions vary widely and that a model sensitivity analysis is essential. He presented lower retrofit estimates for NRs (roughly $50,000 per home in his…
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