GEOTECHNICAL SERVICESPhilosophy Built on the strength of its knowledge of subsurface conditions and their effect on site development, geotechnical engineering is a critical component of the geoscience practices offered at JGI. Since 1986, JGI engineers have been providing practical solutions to our clients' site development problems. The JGI team prides itself on providing a comprehensive package of geotechnical services integrated with environmental capabilities for the purpose of seeing projects from design to construction in an efficient and practical manner. and economical. Geotechnical engineering services at JGI include exploration of subsurface soils, groundwater and bedrock, providing designs compatible with specific geologic conditions and confirming design uncertainties through construction. Our geotechnical engineering staff combines knowledge of soil and rock mechanics, geology and foundation engineering to provide the foundation for practical solutions. KEY COMPONENTS Geotechnical engineering services at JGI are based on several elements, but three key components as follows: Subsurface explorations. Subsurface investigations are generally carried out with in situ tests and sampling via boreholes or test pits; Geophysical techniques such as seismic refraction, electrical resistivity, or ground penetrating radar are used when intrusive exploration methods are not practical. JGI subcontracts exploration services with experienced drilling contractors who provide the equipment necessary to achieve subsurface investigation objectives. Our geologists provide technical guidance and record subsurface conditions; the resulting soil and rock profiles provide data for evaluation...... middle of document ...... gn team, to implement cost-saving features in project documents. The geotechnical services provided by JGI engineers have enabled projects to save significant costs both through the reuse of on-site soils, blast rock and construction demolition, and by successfully excavating within a few feet of existing foundations to depths of more than 20 feet under the foundation in both the soil and bedrock. Geotechnical engineers also offer the knowledge and experience to optimize the ability of site soils and bedrock to support structures, to percolate or provide a barrier to subsurface flow, or to meet regulatory requirements. It is through the study and interpretation of subsurface data that geotechnical engineering contributes to valid projects: practical solutions in terms of constructability, convenience and reliability. Gateway CenterEverett, Massachusetts