June 1, 2011 - EarthFax Completes Geotechnical Design Services for Pipeline Replacement Projects

EarthFax Engineering, Inc. ("EarthFax") was awarded contracts to provide geotechnical hazard evaluation and mitigation design services to a natural gas pipeline company.  This work was completed for replacement of approximately 26 miles of 16-inch diameter pipeline located in northern Utah and southwest Wyoming.  Project work included delineation of fault crossings, evaluation of risks due to displacement during seismic events, and generation of fault displacement models to determine the expected magnitude and occurrence of fault displacements.  Evaluation of liquefaction potential was also completed in areas where shallow groundwater and loose soil deposits pose a significant threat to the pipeline due to displacement or lateral spreading.  Calculations of expected vertical displacements are being prepared for these areas.

Some areas of the pipeline alignment were susceptible to translational landslides and surface sloughing failures, particularly where poorly-graded, fine-grained sands overly bedrock.  EarthFax evaluated historic data and conducted field investigations to more accurately identify areas where slope stability was a significant concern.  In areas where underground mining has occurred, EarthFax reviewed historic data, made site visits to assess actual conditions in these areas, and calculated the probable magnitude of subsidence that may occur. We also delineated several wetland areas within or adjacent to the pipeline alignment to preclude or minimize damage to them.  For each of these hazard evaluations, we designed mitigation plans, as needed, to preserve the operational integrity of the pipeline and protect the environment. 

EarthFax Engineering, Inc. is a consulting engineering firm that was founded in 1982, with offices in Midvale, Utah.  The firm provides services in the areas of civil engineering, environmental engineering, geotechnical engineering, hydrology, geology, land reclamation, and environmental planning.  Additional information regarding EarthFax can be found at www.earthfax.com.