OAR 340-073-0040: Drop Boxes

(1) Drop boxes must be constructed of concrete, fiberglass, or other materials acceptable to DEQ . (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 DEQ. (5) Each manufacturer must provide DEQ 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.