Craig Test Boring, Inc. (CTB) 
CTB is fully equipped and professionally
staffed to provide a
complete range of subsurface explorations and geotechnical
engineering. Subsurface investigations to determine bearing
capacity
and suitability for planned construction is accomplished
with a
modern fleet of truck and all-terrain drill rigs. These
rigs are
operated by experienced drillers who utilize driven casing,
hollow
stem auger and mud rotary drilling methods. An in-house
engineering
staff maintains supervision and monitoring of the soil
investigations.
Geothermal
Services Inc. (GSI) 
GSI started in 1993 as a division of Craig Test Boring Co.,
Inc., a
leading geotechnical, environmental and soils engineering
firm. Since
then, it has expanded its capabilities, personnel and scope
to become
one of the leading earth heat exchanger installers in the
Northeast,
having installed over 3,500,000 feet of vertical ground loop
as well
as horizontal, slinky and pond loops.
American Association of State Highway and Transportation Officials
(AASHTO)
The American Association of State Highway and Transportation
Officials advocates transportation-related policies and provides
technical services to support states in their efforts to efficiently
and safely move people and goods.
CTL is AASHTO certified for
Hot Mix Asphalt, Aggregate, Soil,
Portland Cement Concrete
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