Current through Register Vol. 60, No. 12, December 1, 2021
(1) Dosing tanks
must meet the standards described in OAR 340-073-0025, except as otherwise
allowed in this rule.
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
(3) Each dosing tank must
be provided with a service access manhole having a minimum horizontal
measurement of 18 inches.
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
(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
(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.
Or. Admin. R.
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.
13-2019, amend filed 05/16/2019, effective
Publications: Publications referenced are available from the
Statutory/Other Authority: ORS
Statutes/Other Implemented: ORS