NAVFAC Aircraft Carrier Berthing Study, Apra Harbor, Guam
NAVFAC Aircraft Carrier Berthing Study, Apra Harbor, Guam


U.S. Naval Facilities Engineering Command

Start Date

September 2007

Completion Date

February 2008

DYA Client


Project Description

Diaz•Yourman & Associates (DYA) provided geotechnical services for aircraft carrier berthing studies in Apra Harbor, Guam.  Two locations (the former ship repair facility and Polaris Point) for the proposed project were considered during this conceptual-level phase of the project, with two options for planning based on geotechnical considerations for each site.  The first option consists of a pier extending from the shoreline into the harbor.  The second option consists of a marginal wharf located along the existing shoreline.  The project required a mud line elevation of -50 feet mean lower low water (MLLW) at the face of the pier or the wharf for either site.

The purpose of DYA’s services was to provide conceptual-level geotechnical input to planning.  The scope of our services consisted of:

Reviewing data from previous investigations to estimate the characteristics of the existing subsurface materials

Providing conceptual-level conclusions regarding the following:

Seismicity including liquefaction potential and effects

Dredging considerations

Pier/wharf support type

Cut and fill stability

Preparing a written letter report

Allen M. Yourman, Jr., PE, GE – Geotechnical Principal

Saroj Weeraratne, PhD, PE, GE – Geotechnical Manager

Our Services


  • Site and route evaluations
  • Geologic hazards
  • Seismic design
  • Site characterization
  • Subsurface drainage
  • Grading
  • Ground improvement
  • Slope stability
  • Foundations
  • Dynamic analyses
  • Pavements
  • Instrumentation


  • Material sources
  • Construction observation and testing
  • Verification of anticipated conditions
  • Evaluation of changed conditions
  • Foundation installation
  • Instrumentation
  • Claims evaluation


  • Site characterization
  • Remediation
  • Solid and liquid waste disposal
  • Landfill
  • Aerially Deposited Lead (ADL) Studies
  • Phase I Initial Site Assessments (ISA)
  • Phase II Hazardous Waste Studies
  • Sustainability


  • Forensic investigation
  • Litigation support

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