NE&C was contracted for geotechnical investigation for the new Maintenance Hanger at the Quonset Air National Guard Base in North Kingston, Rhode Island. The project consists of a anew maintenance hanger that will be approximately 304 feet long and 190 feet wide. The new hanger will have new paved parking ares to the north and south. Two new above ground fire water storage tanks and a pump station will also be constructed to the south and west of the main hanger building. Each water tank will have a capacity of 90,000 gallons and will have a concrete ring foundation.

NE&C's scope of work for this project has consisted of the following tasks:

• A filed exploration with eight deep borings within the proposed hanger location to depths ranging from 39-50 feet. Two deep borings were drilled at the proposed water tank and pump station locations to depths of 46-50 feet. Six shallow borings were drilled in the proposed parking areas and hanger apron entrance to depths of about 17 feet.
• Engineering Analyses
• Preparation of this report
• Field surveying to check topography and location of utilities.

Each boring encountered fine to medium grained sand that was loose to very loose and wet and extended to a depth of about 15-18 feet. This loose sand was underlain by a layer of soft peat. The layer of peat and portions of the existing fill are soft and loose and susceptible to compression and consolidation upon the application of structural loads that could result in significant settlement of the ground surface and any overlying structures. To avoid problems with differential settlement, we recommend that the hanger floor be constructed as a structural slab supported by the pile foundation.

The columns supporting the large moment frame structure will be subjected to large downward and uplift loads. We recommended Frank, Piles or Pressure Injected Footings, to support the columns to provide the necessary load bearing capacity at an economical cost. The slab, which will have lesser loads, will be supported by inexpensive timber piles.

NE&C also provided surveying services to assist in project design. This included field verification of site topography to coordinate various data from other surveys and location of existing utilities.