Engineered OWTS uses USDA soil survey assumptions; addendum required if in‑field testing differs
The permit's engineering relied on USDA Web Soil Survey assumptions because the ground was frozen; board members noted the design requires a field profile and an addendum to be submitted to the Town of Pitkin if on‑site findings differ from the survey assumptions.
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The OWTS design presented to the Pitkin Board of Health used assumptions drawn from the USDA Web Soil Survey for the property; the design document states that when the site is accessible a profile excavation must be completed and that any differences from the survey must be addressed with an addendum submitted to the town.
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