Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 71 - ONSITE WASTEWATER TREATMENT SYSTEMS
Section 340-071-0310 - Steep Slope Systems
Universal Citation: OR Admin Rules 340-071-0310
Current through Register Vol. 63, No. 3, March 1, 2024
(1) General conditions for approval. Construction-installation permits may be issued for steep slope systems serving single-family dwellings on slopes in excess of 30 percent if all the following requirements can be met.
(a) Slope does not exceed 45
percent.
(b) The soil is
well-drained with no evidence of saturation to a depth of 60 inches.
(c) The soil has a minimum effective soil
depth of 60 inches.
(2) Construction requirements.
(a) Seepage
trenches must be installed at a minimum depth of 30 inches and a maximum depth
of 36 inches below the natural soil surface on the downhill side of the trench
and must contain a minimum of 18 inches of drain media and 12 inches of native
soil backfill.
(b) The system must
be sized at a minimum of 75 linear feet per 150 gallons projected daily sewage
flow.
Stat. Auth.: ORS 454.625 & 468.020
Stats. Implemented: ORS 454.615 & 454.775
Disclaimer: These regulations may not be the most recent version. Oregon may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
