Section 246-272A-0250 - Installation(1) Only installers may construct OSS, except as noted under subsection (2) of this section.(2) The local health officer may allow the resident owner of a single-family residence to install the OSS for that single-family residence except when: (a) The primary and reserve areas are within 200 feet of marine water;(b) The primary and reserve areas are within 100 feet of surface water; or(c) The installation permit meets Table X standards in WAC 246-272A-0280.(3) The installer described by either subsection (1) or (2) of this section shall: (a) Follow the approved design;(b) Have the approved design in possession during installation;(c) Make no changes to the approved design without the prior authorization of the designer and the local health officer;(d) Only install sewage tanks approved by the department consistent with chapter 246-272C WAC;(e) Be on the site at all times during the excavation and construction of the OSS;(f) Install the OSS to be watertight, except for the soil dispersal component;(g) Cover the installation only after the local health officer has given approval to cover; and(h) Back fill with six to 24 inches of cover material and grade the site to prevent surface water from accumulating over any component of the OSS.Wash. Admin. Code § 246-272A-0250
Amended by WSR 24-06-046, Filed 3/1/2024, effective 4/1/2024Statutory Authority: RCW 43.20.050. 05-15-119, § 246-272A-0250, filed 7/18/05, effective 7/1/07.