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Engineers describe 5,000-gallon tight tank and dewatering plan for Clam Shack replacement
Summary
Falmouth Engineering and Lockwood Remediation described a plan to replace a failing cesspool at the Clam Shack (227 Clinton Ave) with an oversized 5,000-gallon holding/tight tank, using steel sheeting cofferdam excavation, dewatering and filtration under federal and local permits; the hearing was closed and taken under advisement.
Engineers and consultants presented plans to abandon a failing cesspool at 227 Clinton Avenue (the Clam Shack) and discharge plumbing to an adjacent parcel where a 5,000-gallon tight holding tank would be installed, the Falmouth Conservation Commission heard Tuesday.
Michael Bucelli of Falmouth Engineering explained the proposed work: the existing cesspool is failing and likely within or near the groundwater table, so the applicant proposes to repipe plumbing under Clinton Avenue to an adjacent parcel and install an oversized, certified watertight 5,000-gallon holding tank set in the pavement with a concrete ballast slab to offset buoyancy. Bucelli said the excavation would be limited to a trench and tank hole and that steel sheeting would form a cofferdam with dewatering wells and a dewatering system in place during construction.
Kim of Lockwood Remediation Technologies described the dewatering process, saying recovered groundwater would be pumped to a baffled weir tank, filtered with bag filtration, sampled in accordance with EPA dewatering/remediation general-permit requirements, and discharged back to Falmouth Inner Harbor under permit conditions. The presenters said they had applied for and received the required dewatering permit and had obtained Board of Health and selectmen review or approvals where needed for the pipe crossing under Clinton Avenue.
Commissioners asked who would monitor the work; Bucelli said Lockwood and Falmouth Engineering would monitor the dewatering and installation, and that the Board of Health would inspect installation and issue certificates of compliance. With no significant public comment in the chat, a commissioner moved to close the hearing and take the matter under advisement; the motion passed unanimously.
What’s next: staff will include permit conditions and monitoring requirements in any order of conditions if the project is approved; presenters will return with final plans and schedules as required by the commission.
