Section 250-RICR-150-10-6.28 - Septic Tank Effluent PipeA. Size - In no case shall the septic tank effluent pipe be less than four inches (4") in diameter.B. Material - The septic tank effluent pipe shall be constructed of PVC pipe SDR 35 minimum or equivalent. When any portion of the septic tank effluent pipe will be subject to vehicular traffic, it shall be constructed of Schedule 40 PVC or equivalent.C. Joints - All pipe joints for the septic tank effluent pipe shall be made watertight and be firmly connected.D. Slope or Grade - The septic tank effluent pipe shall have a minimum slope of one percent (1%).E. Base - The septic tank effluent pipe shall be laid on a compacted, firm base.F. Alignment - The septic tank effluent pipe should be laid in a straight line wherever possible. Changes in direction shall not exceed ninety degrees (90°). Where a change in direction is greater than forty-five degrees (45°), a manhole is required, unless the change in direction is achieved through the use of a thirty-six inch (36") radius sweep.G. Manholes and Cleanouts - A manhole with a removable cover of concrete, cast iron, or other durable material shall be provided at the junction of two (2) or more septic tank effluent pipes and at all sharp changes in direction greater than forty-five degrees (45°), unless the alignment complies with § 6.28(F) of this Part. A cleanout shall be provided at intervals not greater than seventy-five feet (75').H. Pressurized Septic Tank Effluent Pipe - The Licensed Designer shall specify pressurized septic tank effluent pipe sizing and provide backup calculations to support specification. The pressurized septic tank effluent pipe shall be PVC Class 200 minimum.250 R.I. Code R. 250-RICR-150-10-6.28
Amended effective 11/25/2018
Amended effective 12/28/2021
Amended effective 7/1/2022