GIS Database Development
The large amount of data collected during the pre-design studies, during design phase studies, during construction, and after fill placement was managed using a Geographic Information System (GIS). Data from pre-1990 studies and from all Fugro's studies were input in a consistent format that could be easily accessed for all subsequent projects. That resulted in major cost and time savings for the client. For example, the preliminary Main Channel Dredging program was designed in only 6 weeks with no additional site investigation.

The GIS was essential for:

• Gathering existing data including historical maps showing pre-development physiography, historic seawall/dike locations, and existing explorations.
  
  
• Entering data from various sources into a consistent format
  
  
• Integrating boring, CPT, and geophysical data
  
  
• Identifying and mapping the top, bottom, and thickness of 10 major geologic units in the outer harbor area
  
  
• Developing a three dimensional model of the subsurface
  
  
• Identifying areas with sand versus clay to help engineer the dredging sequence to allow the placement of sand in critical areas and clays in non-critical areas such as the shallow water habitat
  
  
• Calculation of liquefaction potential for various earthquake scenarios
  
  
• Estimating the level of post-construction ground improvement required to meet long-term design criteria using CPT plots, parameter plots, and cross sections.
  
  
• Evaluating the effectiveness of improvement techniques by comparing pre- and post-improvement cross sections and parameter plots.