This project was to build a new wastewater treatment plant for the growing region. Our team was contracted to perform site preparation, site demolition, site grading cut to fill, early large diameter pipe backfill, temporary erosion sedimentation control, mass excavation and embankment, storm drainage, import and embank fill, site grading for all roadways and landscapes, structural excavation and backfill, dewatering, creek restoration, large diameter yard piping for the treatment plant, fire protection, installation of gas main, sanitary sewer, fire protection lines with cathodic protection, foul air lines, precast chemical trenching, all site grading paving and channelization.
SCOPE OF WORK
This large, complex project included four different contracts. The first phase was the site preparation contract, which consisted of site grading, excavation and backfill for King County’s effluent drop structure, and trenching and backfill for large diameter pipe. The second phase for the site was the mass excavation and embankment of all the structures onsite. The scope of work also included temporary erosion control and stormwater treatment, storm drainage, underslab drainage, site grading of all landscaping berms and ponds, dewatering, structural backfill, and a restoration of Howell Creek. The third phase, we teamed up with University Mechanical to install all the various yard piping required for the treatment plant. The utilities included domestic water, fire protection, natural gas, foul air, reclaimed water, sanitary sewer, and others. The fourth phase was to perform all roadway grading, paving, and channelization.
2353 130th Ave. NE Suite 100
Bellevue, WA 98005