Or. Admin. R. 340-073-0040 - Drop Boxes
Current through Register Vol. 60, No. 12, December 1, 2021
(1) Drop boxes must
be constructed of concrete, fiberglass, or other materials acceptable to the
department.
(2) Drop boxes must be
constructed of durable, watertight materials resistant to deterioration and be
designed to accommodate watertight connections for the effluent sewer and
header pipes. The top, walls, and bottom of concrete drop boxes must be at
least 1-1/2 inches thick. All drop boxes must be able to support an earth load
of at least 200 pounds per square foot.
(3) The inverts of the inlet and overflow
port must be at the same elevation. The invert of the header pipe port(s)
leading to the absorption trench(es) must be 6 inches below the inlet
invert.
(4) Drop box covers must be
marked with the manufacturer's full business name or number assigned by the
department.
(5) Each manufacturer
must provide the department with complete, detailed plans and specifications of
the drop box and must certify, in writing, that drop boxes manufactured for use
in onsite systems in Oregon will comply with all requirements of this rule.
Plans and specifications must be prepared under the supervision of and designed
by a professional engineer licensed in accordance with ORS Chapter
672.
Notes
Stat. Auth.: ORS 454.625 & 468.020
Stats. Implemented: ORS 454.615
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