Abstract
The Denver Metro Wastewater Reclamation District (MWRD) is installing a 10-inch pressure pipeline to carry potable water from the Robert W. Hite Treatment Facility located in Denver, Colorado to the MWRD facility. The pipeline alignment crosses beneath both the Burlington Ditch, owned and operated by the Farmers Reservoir and Irrigation Company (FRICO), and the Union Pacific Railroad (UPRR) trestle, both of which have specific and stringent requirements for trenchless pipeline installations. Furthermore, the pipeline traverses Denver Water right-of-way, thus triggering the necessity to adhere to another set of trenchless installation requirements. This paper presents challenges encountered during design and construction of the horizontal directional drill, focusing on how the design and construction was influenced by FRICO, UPRR, and Denver Water requirements. Discussion of the settlement and hydrofracture analysis performed during design is presented and compared to what was observed in the field during construction. Furthermore, this case study details the morass of permitting requirements encountered and how, as a whole, the requirements actually dictated the overall risk profile of the project.
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