WWTP Outfall Extension

摘要

Mears Group Inc. took on a short but complicated HDD project in Gig Harbor,Wash.,installing 711 ft of 24-in. HDPE in a water-to water crossing under a historical lighthouse sitting on a sandspit and near a community park. Due to 15-ft tides and potential storm surges, Advanced American Construction built stationary platforms for the HDD rigs at both the entry and exit sites 45 to 50 ft above the sea bed.The commensurate hydrostatic head associated with this elevation created an additional 30 psi of required lift to get the anticipated heavy returning drilling fluids (with entrained cuttings) back up to the top of the platform to the recycling plant.