Engineers based design on USDA Web Soil Survey; board questions addendum vs. required site report

Apr 25, 2025

Board members and staff discussed that the engineer used the USDA Web Soil Survey as the assumed basis for the OWTS design and that a site/soil evaluation could not be completed at the meeting because the ground was frozen; the engineers indicated an addendum would be required if in‑field testing differed from assumptions.

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Board members noted the design package cites the USDA Web Soil Survey as the assumed basis for initial soil conditions. Speaker 3 (Eddy Alto) read the design language aloud: "At this time, the assumed design will be based on the USDA web soil survey site," and explained that the document requires a profile excavation and that, if actual field findings differ, "an addendum shall be submitted to the town of Pitkin."

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