OAR 340-071-0520
Large Systems

Unless DEQ authorizes otherwise, large systems must comply with the following requirements.
(1) Large system absorption facilities must be designed with distribution to the cells by means of pumps or siphons.
(2) The absorption area must be divided into relatively equal units. Each unit may receive no more than 1300 gallons of effluent per day.
(3) The replacement (repair) absorption area must be divided into relatively equal units, with a replacement absorption area unit located adjacent to an initial absorption area unit.
(4) Effluent distribution must alternate between the absorption area units.
(5) Each system must have at least two pumps or siphons.
(6) The applicant must provide a written assessment of the impact of the proposed system on the quality of public waters and public health, prepared by a registered geologist, a certified engineering geologist qualified as a hydrogeologist, or a subordinate under the direction of either, except as specifically exempted in ORS 672.535 (Exemptions from ORS 672.505 to 672.705).
(7) The owners of all new and existing large systems must register those systems with DEQ as Underground Injection Control (UIC) systems under OAR chapter 340, division 044. Large systems receiving domestic waste are regulated under this division. Drainfields receiving nondomestic waste are also regulated under the UIC rules.

Source: Rule 340-071-0520 — Large Systems, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-071-0520.

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 340-071-0520’s source at or​.us