Representative Tunnel & Trenchless Projects
Itare Dam Water Transfer Tunnel, Kenya - Pre-Bid Ground Conditions Assessment
Golden Geotechnics was contracted by the selected TBM manufacturer during contracting to provide a thorough review of ground conditions from project contract documents and regional geologic setting to evaluate ground behavior for the selected Crossover TBM. By going back to the data with a regional understanding of the interbedded tuffs, ground behavior conclusions were drawn that allowed increasing the anticipated performance of the Crossover TBM by running in open mode for a higher percentage of the tunnel alignment.
UP Tunnel 2 Structural Repair, ID* - Ground Conditions Investigation and Construction Observation
GGI Principal Sean Sundermann completed a subsurface drilling and tunnel lining inspection using non-destructive testing investigation into the root cause of ongoing shearing of timber sets and potential roof failure within the 90-year-old Union Pacific Spokane Sub Tunnel 2. Sean provided full-time construction management and on-site material testing services for the final repair to the tunnel. Worked with the contractor to further value engineer and overcome obstacles of working in a remote tunnel.
Rondout By-Pass Tunnel, NY - Construction Observation*
GGI Principal Sean Sundermann served as a senior tunnel geologist mapping multiple rounds of drainage tunnels being mined by drill and blast methods. His duties included evaluation and documentation of ground conditions, sequential excavation consulting, directing initial ground support selection, real-time spot support construction (rockbolts) and support recommendations during excavation.
WaterPro Recycled Water Pipeline Project, UT - Basis of Design and Geotechnical Baseline Report
Golden Geotechnics is contracted as part of the design team for three trenchless crossings of the west to east valley WaterPro Recycled Water Pipeline. GGI completed a basis of deign memorandum and led a design workshop presenting trenchless technology options with project risks associated with the baselined ground conditions and costs. GGI will complete the GBR in the first quarter of 2024, submitted as part of the contract documents for contractor selection in 2024.
Calleguas Water Santa Susana Tunnel, CA* - Tunnel Seismic Impacts and Retrofit
GGI Principal Sean Sundermann led geologic studies to identify potential failure mechanisms that may impact operations and performance during the design earthquake. As lead geologist, Sean was responsible for mapping the project area geology, estimating ground motions and fault rupture hazard analysis for a worst-case scenario earthquake, and assessing tunnel conditions. Sean was part of the tunnel mitigation design team to retrofit the tunnel lining.
* Projects prior to GGI