20 E: Pioneer WWPS Replacement

Project Description

The Pioneer Wastewater Pump Station Replacement Project included the removal of the existing wastewater pump station and related appurtenances; the installation of a new 500 GPM pre-manufactured pump station and construction of the 372 square foot electrical building; the installation of two 8-inch force mains (1,385 lineal feet each) with pig launch and retrieval vaults; and the installation of 980 lineal feet of 8-inch gravity sewer and seven sewer manholes. From the start of this project COP crews have redesigned the gravity sewer and force main alignments. COP worked with the owner to shift the new gravity sewer 18 lineal feet laterally, which allowed COP to install efficient shoring systems and improved access for export and import of onsite processed material. The alignment shift allowed for a large clear zone from traffic and an improved swing radius of the lead and trail excavators. The adjustment also allowed for a larger sub-cut prior to excavation which reduced the total depth of the trench boxes required and allowed smaller shoring equipment. The reduced depth of excavation reduced the cost for export and import of materials. COP processed on site material and material from other COP projects to eliminate the need of import pit produced granular backfill. COP redesigned the alignment of the new force main to allow for safer insertion pits and receivable pits. The revised alignment allowed our subcontractor to operate larger equipment and increase production. The revised alignment also eliminated the need for a full by-pass of the existing system while all new work is being installed. Once the new pump station is operational, COP only needed to plug to each existing point to fully abandon the old system.