Eastern Regional Pipeline

Project involved the design and installation of approximately 18-miles of 30” water pipeline under a design-build contract.

This project was accelerated to complete construction in 30 months, using six separate design and construction packages. PIC provided owner and contractor support, design, and construction phase services. Additional project services included extensive permitting, third party reviews, detailed pipe design and construction specifications, utility coordination, and public outreach.

The Eastern Regional Pipeline Project (ERPP) is owned and operated by the Dominion Water & Sanitation District (DWSD). The ERPP is one of many essential components of the South Metro Water Supply Authority’s Water Infrastructure and Supply Efficiency (WISE) Program, and it is through DWSD’s participation in WISE that it is leading the way in fulfilling an important goal of providing northwest Douglas County with a water supply that is renewable. Through the ERPP, northwest Douglas county will have access to a renewable, sustainable, and reliable supply of potable water. By securing WISE water, participants will reduce, and in some cases, prevent dependence on non‐renewable Denver Basin groundwater, which has historically been a significant, but diminishing, water supply source for water users in Douglas County. For DWSD, and future regional users in northwest Douglas County, to access this renewable water supply, the ERPP was required to provide a conveyance link between DWSD and the Town of Castle Rock water distribution system which is used to transfer water northwest towards DWSD’s service area.

Project services included extensive permitting, third party reviews, detailed pipe design and construction specifications, utility coordination, and public outreach. The project’s planning phases involved performing alternative analyses to route the pipeline through portions of the Town of Castle Rock, Douglas County, and the Town of Sedalia. The pipeline’s route analyses involved evaluating hydraulics, costs, public impacts, environmental compliance, schedule, and constructability. From a design standpoint, the project involved hydraulic, soils, and loading evaluations to develop technical specifications related to wall thickness, coatings, and manufacturing. The design phases also involved developing technical specifications, drawings, and geotechnical design reports associated with the project’s numerous tunnels that were necessary to cross State Highway 85 and 67, the BNSF and UPRR Railroads, and a congested area of large diameter sanitary sewer utilities.