WAC 246-272B-05100. Construction oversight and testing

The design engineer or the engineer's authorized representative shall: (1) Conduct inspections to: (a) Verify LOSS construction and materials conform with approved plans and specifications; and (b) Collect data for the record drawings. (2) Inspect the following: (a) Poured-in-place sewage tanks construction; (b) Installation of proprietary and public domain treatment and dispersal components; (c) Installation of LOSS components in difficult conditions including, but not limited to, steep slopes and shallow soils; and (d) Placement of sand or other fill material. (3) Conduct or witness LOSS component testing to verify that all results fall within acceptable limits: (a) Water tightness testing of all tanks under WAC 246-272B-05200 ; and (b) Pressure testing of all new collection and conveyance piping according to an acceptable industry standard; and either (c) Pressure and flow testing of the subsurface drip system to verify it functions properly prior to scheduling a LOSS final inspection by the department; or (d) Pressure testing of the drainfield to verify it functions properly prior to scheduling a LOSS final inspection by the department. (4) Record baseline pressure and flow information and provide passing results to the department during the final inspection.