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NSF P331 PDF
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NSF Protocol 331 – In-Situ Volume Measurement of On-Site Wastewater Treatment System Drainfield Products
standard by NSF, 01/25/2006
This protocol establishes standard procedures for the measurement of the volume under in-situ conditions for the following onsite wastewater treatment system drainfield products: conventional natural aggregate (e.g. crushed rock or stone) and pipe, molded plastic chambers, and large diameter plastic pipe and geotextile composite products.
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