Standard Practice for
Subsurface Installation of Corrugated Polyethylene Pipe for
Agricultural Drainage or Water Table Control1
This wellknown is issued below the constant designation f 449; the number at once following the designation indicates the 12 months of
unique adoption or, in the case of revision, the yr of last revision. various in parentheses shows the yr of ultimate reapproval. a
superscript epsilon (e) indicates an editorial change for the reason that remaining revision or reapproval
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