4.18 Sewer Service Laterals

1) Sewer service laterals include building sewers previously defined.

2) Sewer service laterals shall not tie into manholes unless approved by the Director. Where allowed, lateral inverts shall provide a minimum of 0.5 feet fall across the manhole, or the lateral shall match crowns with the outlet pipe, whichever is higher.

3) Construction of the sewer service lateral shall be of the same quality and meet the same requirements as the public sewer with regard to materials, watertightness, and location. In addition, these sewers shall conform to the State and local plumbing codes and restrictions. No roof, surface, foundation, or stormwater drain lines shall be connected to the public sewers or service laterals.

4) Each legal lot of record or building shall be provided with a separate sewer service lateral connected to the public or approved private sewer main. Combined sewer service laterals will be permitted only when the property cannot legally be further divided.

5) Separate sewer service laterals shall be installed to serve each side of duplex lots. Separate sewer service laterals shall be installed to serve each unit of condominiums or developments with separate detached dwelling units (except where otherwise approved by City for manufactured home parks).

6) Additional sanitary sewer laterals must be stubbed into the property lines sufficient to serve all residential parcels (including those which can be further partitioned in the future) where such service or future partition would require that new streets be cut to install such services.

7) Grease removal shall conform to building and plumbing code.

a) As noted under PWDS 4.9.a.3, gravity sewer service is required where possible. Installation of private sewer pump stations is not allowed except with express prior written approval by the City Engineer (during land use approval where applicable, and prior to submittal of project design drawings for review otherwise).

b) Any private sewer pump stations shall be submitted and designed per current building requirements and approved by the City Engineer.

c) An operation & maintenance agreement acceptable to the City shall be recorded against the property.

d) All private force mains installed in the ROW shall have tracer wire. Tracer wire must be tone tested by Public Works before City acceptance.

1) A cleanout (set in a cleanout box conforming with City standard details) shall be installed at or near the right-of-way or easement line for all sanitary sewer service laterals, at a location acceptable to Public Works. The sanitary sewer service lateral shall extend beyond the cleanout to the back of any private utility easement (PUE) fronting the right-of-way or easement.

2) For long sewer service laterals, a cleanout shall be installed at maximum 100- foot intervals beyond the right-of-way or easement line, as well as on the upstream side of any intermediate property lines crossed.

3) Unless otherwise approved by the City Engineer, sewer service laterals shall have at least four (4) feet of cover from finish grade (typically sidewalk grade) at the right-of-way or easement line. Generally, the topography of the property will dictate how deep the service line must be.

1) The minimum inside diameter of a sewer service lateral shall be four (4) inches and shall be equal to or greater than the building plumbing stub (building drain) diameter.

2) The minimum inside diameter of sewer service laterals to serve multifamily dwellings or commercial buildings shall be six (6) inches. Fixture unit equivalents shall be determined in accordance with the Oregon Plumbing Specialty Code.

3) Minimum sizes and slopes for sewer service laterals, based on the fixture unit equivalents, shall be in accordance with the Oregon Plumbing Specialty Code.

4) Sewer service laterals for townhouses and similar cluster housing developments shall be installed on a uniform slope from the main line sewer connection to a point five (5) feet from the end of the building drain conforming to the above requirements.

1) The City is under mandate from the Oregon Department of Environmental Quality (DEQ) to reduce infiltration and inflow (I/I) of storm runoff and groundwater into the City's sanitary sewer system. A significant portion of the (I/I) problems in the City's sewage collection system are attributable to leaking sewer service laterals or drains connected to service laterals. DEQ and City standards require that "No person shall discharge or cause to be discharged any storm water, surface water, groundwater, roof runoff, subsurface drainage to any sanitary sewer." SMC 13.44.050 also requires property owners to maintain the sewer service laterals in a free-flowing and watertight (leak free) condition. The City requires applicants to demonstrate compliance with this ordinance by testing existing sanitary sewer service laterals (at the expense of the applicant) which are proposed for continuing use.

2) Unless waived in writing by the Director (for newer PVC laterals), all existing sewer service laterals shall be air tested from the mainline to the building to verify that it is free of leaks or defects. The service laterals shall be tested at 4.to 5 psi, and a loss of O.5 psi in 15 seconds constitutes a test failure. The service lateral shall be replaced if defective. Cleanouts per PWDS (& plumbing code) requirements shall be installed on existing sanitary sewer service laterals which are proposed for continuing use (i.e. those which do not already have cleanouts).