(1) All discharges to the district sewer system shall meet the requirements of Chapter 6.10 SLWSDC.
(2) Work shall be performed only by contractors experienced in laying public sewer mains in accordance with the requirements of the project developer extension agreement and all required permits, licenses, and regulations of the land use agency.
(3) Prior to any work being performed, a copy of the survey cut sheets and proposed construction schedule shall be provided to the district.
(4) All materials shall be new and undamaged.
(5) Developer shall obtain approval of materials to be used from the district through a submittal review process prior to ordering of materials.
(6) Sewer mains and laterals shall be laid only in dedicated existing or future public rights-of-way, or utility easements that have been or will be granted to the district.
(7) All private side sewer connections to the district sewer system shall be a gravity connection unless otherwise approved by the district.
(8) Existing facilities shall be addressed in accordance with SLWSDC 6.20.210.
(9) District sewer laterals over 50 feet long within the right-of-way or dedicated utility easement, and private side sewer lines over 200 feet long from the end of the district lateral, are prohibited. A sewer main extension would be required to provide service beyond those limits unless otherwise approved by the district.
(10) Separation between water and sewer lines shall be in accordance with the current State Department of Ecology Criteria for Sewage Works Design. There shall be a minimum of five feet of horizontal separation between district sewer mains and storm water or other utility lines unless approved by the district.
(11) Sewer mains shall generally be located parallel to and five feet southerly or westerly of street centerline where possible.
(12) The minimum slope for continual gravity mains shall be one-half percent. The minimum slope for sewer laterals shall be two percent and the maximum shall be 100 percent (45 degrees).
(13) On dead-end run gravity mains where no further extension is needed or planned, the minimum slope shall be one percent and wye connections used for laterals.
(14) The maximum distance between manholes shall be 400 feet unless approved by the district.
(15) Manholes shall be eight feet deep unless approved by the district. The minimum depth of a manhole allowed by the district shall be five feet.
(16) Manholes greater than 18 feet deep shall be a minimum of 54 inches inside diameter.
(17) Manholes greater than 25 feet deep should be submitted for preliminary design review prior to final approval by the district. Deep designs will not be approved if alternative service can be provided with shallower gravity service as deemed appropriate for the site by the district.
(18) Manholes shall be provided with a one-tenth foot drop across the channel.
(19) Locking lids shall be provided for all manholes and all manhole lids shall have the word “sewer” cast integrally onto its surface.
(20) All manholes shall be accessible to maintenance vehicles via a drivable surface.
(21) Front lot corners and a property line stake with a 10-foot and 15-foot offset shall be staked prior to construction for sewer lateral location.
(22) Sewer laterals shall be located a minimum of 10 feet from the side lot line and extended past dry utilities unless otherwise approved by the district.
(23) Sewer pretreatment and FOG facilities shall be designed and installed in accordance with Chapter 6.10 SLWSDC. A permit application and payment of applicable fees are required for all new installations.
(24) Pipe trenches shall not be backfilled until pipe and bedding installation has been inspected by the district.
(25) Road restoration shall be per Snohomish County, city and/or state design and construction standards. The developer shall become familiar with all county, city and state conditions of required permits, and shall adhere to all conditions and requirements. [Res. 835 § 2 (Exh. 2), 2022; Res. 735 § 1, 2017.]