Gateway Energy Storage Facility
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Project Objective

Geosyntec performed a geotechnical Investigation at the proposed Gateway Energy Storage Facility. The proposed development includes an automated battery storage facility warehouse constructed upon multi-level pads created with retaining walls, substation equipment pads, overhead transmission poles, transformer/inverter skids supported on driven piles, and associated improvements (pavements, utilities, etc.).

Geosyntec implemented a subsurface exploration program that included hollow-stem auger borings with sampling and laboratory testing to characterize and evaluate soil properties. Geosyntec also performed infiltration testing to evaluate the potential for stormwater infiltration per the County of San Diego Stormwater Design Manual. Thermal resisitivity testing was performed by a Geosntec subconsultant under direction of Geosyntec personnel to understand electrical loss properties from buried conductors. Upon completion of field work and analysis, Geosyntec issued a geotechnical report which included geologic site conditions and hazards, a review of previous site reports, grading recommendations, foundation recommendations, transmission pole foundation design parameters (including L-Pile criteria), infiltration calculations iand recommendations, pavement section recommendations, and other necessary information. As the design evolved, Geosyntec was later tasked to provide additional geotechnical analysis for driven piles proposed to support 74 inverter/transformer skids at the site. Geosyntec provided laterally loaded pile analyses to provide minimum embedment depths, frictional resistance, point of fixity, and lateral deflection under loading.

Geosyntec’s Scope of Services

  • Geotechnical drilling and soil sampling;

  • Infiltration testing and analysis;

  • Foundation design parameters for structures, transmission poles, and retaining walls;

  • Thermal resistivity and corrosivity testing and analysis;

  • Driven pile geotechnical analysis including L-Pile lateral loading analysis.

Notable Accomplishments

By creating detailed cross sections to evaluate the soil conditions beneath the site, each of the 74 inverter/transformer skids was assigned to one of three different foundation groups. The analysis provided different foundation criteria for each group including total depth of pile, rather than a conservative blanket dimension. This ultimately provided significant savings through reduced labor effort and material costs.

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Project Summary

  • Location: Otay Mesa, California
  • Client: LS Power, LLC / McCarthy Building Companies
  • Project Practice Areas: Environmental Management, Geotechnical
  • Type of Facility: Transmission
  • Services Provided: Geotechnical investigation, Thermal resistivity testing, Infiltration testing, Deep Foundation and laterally loaded pile design
  • Type of Work: Geotechnical Site Investigation
  • Governing Regulation: State and local