Pine Hollow Stream Removal Project


Location: Allegheny County, Pennsylvania

Michael Baker International worked with the U.S. Army Corps of Engineers (USACE), Allegheny County Sanitary Authority (ALCOSAN), and other local entities to remove Pine Hollow Run from the existing Broadway Interceptor to help alleviate chronic basement flooding in the project area and provide additional sanitary sewer capacity to allow for future development.

Michael Baker used the Preliminary Engineering Report commissioned by ALCOSAN as a basis for final design of the stream removal project. The location and verification of existing utilities along the storm sewer alignment were a top priority of the project team. The team prepared drawings that depicted the existing rights-of-way within and along the proposed alignment of the new stream conveyance system. The plan also identified areas of proposed new rights-of-way for the construction of a stream conveyance system. This included both temporary and permanent easement acquisitions.

Michael Baker acquired NPDES permitting and an Erosion and Sedimentation Control Permit for the project. Michael Baker also prepared and obtained the ACOE 105 permit and the DEP 104 joint permit for the stormwater project. As part of the project, the Michael Baker team completed wetland delineation investigation and report for the project site. In addition, Michael Baker provided plans for the maintenance and protection of traffic and construction sequencing that would minimize impacts to the communities when construction begins. The team also prepared plans and cross sections depicting areas of full and partial roadway reconstruction.

Finally, the team created and updated E&S plans, construction specifications, and cost and quantity estimates were created and updated throughout the design. The design process was fast-tracked to ensure that construction documents would be complete by the spring 2010 construction season so that the project could be awarded and construction set to begin by summer 2010.

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