OAR 340-071-0310
Steep Slope Systems


(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.

Source: Rule 340-071-0310 — Steep Slope Systems, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-071-0310.

340‑071‑0100
Definitions
340‑071‑0110
Purpose
340‑071‑0115
Technical Review Committee
340‑071‑0120
Jurisdiction and Policy
340‑071‑0130
General Standards, Prohibitions and Requirements
340‑071‑0135
Approval of New or Innovative Technologies, Materials, or Designs for Onsite Systems
340‑071‑0140
Onsite System Fees
340‑071‑0150
Site Evaluation Procedures
340‑071‑0155
Existing System Evaluation Report
340‑071‑0160
Permit Application Procedures — Construction, Installation, Alteration, and Repair Permits
340‑071‑0162
Permit Application Procedures — WPCF Permits
340‑071‑0165
Permit Denial Review — Construction-Installation, Repair, Alteration Permits
340‑071‑0170
Pre-Cover Inspections
340‑071‑0175
Certificate of Satisfactory Completion
340‑071‑0185
Decommissioning of Systems
340‑071‑0200
Prior Construction Permits or Approvals
340‑071‑0205
Authorization to Use Existing Systems
340‑071‑0210
Alteration of Existing Onsite Wastewater Treatment Systems
340‑071‑0215
Repair of Existing Systems
340‑071‑0220
Standard Subsurface Systems
340‑071‑0260
Alternative Systems, General
340‑071‑0265
Capping Fills
340‑071‑0275
Pressurized Distribution Systems
340‑071‑0280
Seepage Trench System
340‑071‑0285
Redundant Systems
340‑071‑0290
Conventional Sand Filter Systems
340‑071‑0295
Conventional Sand Filter Design and Construction
340‑071‑0302
Recirculating Gravel Filter (RGF)
340‑071‑0310
Steep Slope Systems
340‑071‑0315
Tile Dewatering System
340‑071‑0320
Split Waste Method
340‑071‑0325
Gray Water Waste Disposal Sumps
340‑071‑0330
Nonwater-Carried Systems
340‑071‑0335
Cesspools and Seepage Pits
340‑071‑0340
Holding Tanks
340‑071‑0345
Alternative Treatment Technologies (ATTs)
340‑071‑0360
Absorption Trenches in Saprolite
340‑071‑0400
Geographic Area Special Considerations.
340‑071‑0410
Rural Area Consideration
340‑071‑0415
For Cause Variances
340‑071‑0420
Hardship Variances
340‑071‑0425
Variance Officers
340‑071‑0430
Variance Hearings and Decisions
340‑071‑0435
Variance Permit Issuance, Inspections, Certificate of Satisfactory Completion
340‑071‑0440
Variance Appeals
340‑071‑0445
Variance Administrative Review
340‑071‑0460
Moratorium Areas
340‑071‑0500
Community Systems
340‑071‑0520
Large Systems
340‑071‑0600
Sewage Disposal Service Licenses
340‑071‑0650
Training and Certification Requirements for System Installers and Maintenance Providers
340‑071‑0800
Tables
Last Updated

Jun. 8, 2021

Rule 340-071-0310’s source at or​.us