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Conservation commission says Herring Pond alum plan needs more data, continues hearing
Summary
Town and consultants presented a Notice of Intent to repeat an alum treatment of Herring Pond; commissioners found the WPA form and appendices incomplete, asked for updated 2026 monitoring data and clearer limnology justification, and continued the hearing for more information.
The Eastham Conservation Commission opened a hearing on the town's Notice of Intent to apply alum (aluminum sulfate) to Herring Pond to reduce internal phosphorus loading and improve water quality. Mickey Marcus, a professional wetland scientist who helped prepare the filing, said the proposal builds on the 2012 application and the town has assembled 15 years of water‑quality monitoring to support the plan. "We have 15 years of water quality data," Marcus said, noting the 2012 dosage was 75 grams per meter squared and that he and the applicators will finalize dosage using 2026 sampling.
Commissioners and staff, however, found the WPA Form 3 incomplete and missing required Appendix A and other documentation for an ecological‑restoration limited project. The chair pressed for clearer descriptions of alum methods, pH monitoring, time‑of‑year restrictions to protect the herring run, and recent sediment and phosphorus testing. Ellen Ridge, who led local fundraising and said town meeting approved $193,000 for repeat treatment, described community support but agreed the commission needed the technical appendices. The commission voted to continue the hearing and asked the project team to supply corrected forms, explicit limnologist reports, site locus maps and 2026 monitoring results before the next meeting.
