"Fossumdalen stage 5-6 - Ledningstrasé" is part of a larger water and sewage project in Trondheim municipality that has run, and shall run, over several stages. The aim is to reduce the amount of overflow supplied to The River Nidelva from the sewage network by establishing a separated main stem for W&S from the sewage zone Lerkendal where surface water is led to the River Nidelva, and waste water is fed by a self-fall to Høvringen treatment facility. In "Fossumdalen stage 5-6, Ledningstrasé", the existing overflow (OP04) shall be established in "Fossumdalen stage 4" connects to the Høvringen sewage tunnel via a diving pipeline under the River Nidelva with a flushing magazine. The pipeline installation starts with drilling rock from the west side of Osloveien south of Stavne to Høvringen sewage tunnel. Under osloveien, a sewage pipeline is laid through a completed freighter and dug a ditch to the east between the properties in Sivert Dahlens veg. Pipelines that controlled drilling will be executed under the River Nidelva to Valøya. Over Valøya and up to Valøyslyngen, pipelines are to be dug in a ditch. Pipelines in valøyslyngen shall be executed in an increased dimension, which together with the existing volume in the existing sewage pipeline upstream OP04 (new overflow) functions as flushing magnet for the diving line. The flushing magazine shall be emptied via a flush manhole and the facility shall be adapted for the supply of water from the municipality ́s water pipelines. A new water and sewage system shall also be constructed from OP04 (a new overflow) to the junction of Alfred Larsens gate and Valøyslyngen. From the junction of Alfred Larsens gate and valøyslyngen, a new water pipeline will be laid in the same route as the existing water pipeline to Holtermanns road. The following turnkey contracts will be transported to the general contractor:1 "Fossumdalen stage 5-6 - Sewage pump station" (the existing sewage pump station APS is replaced by a smaller and more modern sewage pump station APS04.2 "Fossumdalen section 5-6, HVAC, management and automation"The general contractor will take over, among other things, the engineering design and coordination responsibility for these two turnkey contracts. As part of "Fossumdalen stage 5-6, Ledningstrasé", a sheet box shall be prepared for a sheet box for setting down the new APS04, and the existing Water and Sewage will be connected to the new APS04.