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Commission approves septic upgrade and exploratory foundation assessment at 46 Tennessee Ave with multiple waivers
Summary
The commission granted an order allowing replacement of a conventional septic tank with a 1,500‑gallon nitrogen‑reducing system and authorized an exploratory assessment of foundation repairs at a flood‑zone house; several local waivers were granted based on net benefit findings.
At its Sept. 4 meeting the Nantucket Conservation Commission approved a notice‑of‑intent order allowing the replacement of a conventional 1,000‑gallon septic tank with a 1,500‑gallon nitrogen‑reducing (I/A) tank at 46 Tennessee Avenue and accepted an exploratory assessment for potential foundation repairs for the existing dwelling.
Paul Santos of Nantucket Surveyors, representing property owners Christopher and Cheryl Emery, told the commission the house was built after the wetland bylaw took effect (early 1980s) and that the parcel lies within flood zone AE, base elevation 8. Santos described the project: replace the septic tank, maintain the existing trench, and undertake exploratory test pits to determine groundwater and soils for a proposed helical‑pile foundation and concrete grama beam. "All the work would be in compliance with the current flood zone standards," Santos said, adding the planned foundation would not create a basement and would include flood vents.
The application requested waivers under local regulations for work in buffer zones and for foundation repairs that may be within two feet of groundwater (transcript cites local sections). Santos told commissioners the applicant did not meet grandfathering provisions and sought waivers under the premise the project would provide a long‑term net benefit for the resource area. The commission found that the project would result in a long‑term net benefit and granted waivers under the cited local sections, conditioned the approval on a final sewage disposal system plan to be filed as an amended order or minor modification, and required plantings where site disturbance warranted. The commission closed the public hearing and issued the order unanimously.
The permit includes standard flood‑compliance language and requires final foundation plans (engineer‑stamped flood vents) be provided to the commission as part of the final filing.
