Or. Admin. R. 340-073-0050 - Distribution Boxes, Drop Boxes, and Diversion Valves: Dosing Tanks

(1) Dosing tanks must meet the standards described in OAR 340-073-0025, except as otherwise allowed in this rule.

(2) Each dosing tank employing one or more pumps must have a minimum liquid capacity equal to the projected daily sewage flow for flows up to 1,200 gallons per day. The department will determine tank sizing for dosing tanks with projected daily sewage flows greater than 1,200 gallons per day. The liquid capacity of dosing tanks must be as measured from the invert elevation of the inlet fitting.

(3) Each dosing tank must be provided with a service access manhole having a minimum horizontal measurement of 18 inches.

(4) Each dosing tank proposed to serve a commercial facility containing more than one pump or siphon must be provided with at least one service access manhole that provides adequate space to construct, install, service, and operate the equipment in accordance with the requirements of OAR 340, divisions 071 and 073.

(5) The installation manual described in OAR 340-073-0025(13) must include additional information about siphon selection, installation of the pump or siphon screen, pump control and alarm levels, and the watertight pass-through methods for electric wiring and pipe.

(6) Dosing tanks with siphons must be designed and sized for each specific project. The tank manufacturer must specify the type or model of siphon, screen, and related apparatus that are compatible with each dosing tank.

(7) The inlet fitting must extend below the lowest operating level of the pump or siphon.

Notes

Or. Admin. R. 340-073-0050

DEQ 10-1981, f. & ef. 3-20-81; DEQ 5-1982, f. & ef. 3-9-82; DEQ 15-1986, f. & ef. 8-6-86; DEQ 27-1994, f. 11-15-94, cert. ef. 4-1-95; DEQ 11-2004, f. 12-22-04, cert. ef. 3-1-05; DEQ 13-2019, amend filed 05/16/2019, effective 5/16/2019

Publications: Publications referenced are available from the agency.

Statutory/Other Authority: ORS 454.625 & 468.020

Statutes/Other Implemented: ORS 454.615