Summit Geoengineering Services (SGS)
We are a Maine-based consulting firm that provides responsive geotechnical consulting services throughout New England.
In-house Exploration, Laboratory, and Design
SGS provides a full range of geotechnical services in-house, including field exploration, laboratory testing, and geotechnical consulting and design, which provides full control of the project schedule so our clients receive a better final product while saving time and money.
Collaboration
SGS collaborates with the full project team including the owners, civil and structural engineers, architects, and contractors to fully understand the needs for each project and provide geotechnical engineering recommendations and designs.
Services
We provide subsurface explorations, laboratory testing, and design recommendations for a wide range of projects including:
- Geotechnical Site Investigation:
- Geotechnical Foundation Recommendations & Designs
- Geotechnical Instrumentation & Monitoring
- Subsurface Investigations
- Earthwork Construction Design:
- Ground Improvement Designs
- Earth Retention System Designs
- Earthwork Construction Services
- Quarry / Gravel Pit Evaluations
- Slope Stability / Landslide Evaluation
- Shoreline Stabilization Design and Permitting
- Sheeting / Shoring Stabilizations
- Excavation & Dewatering
- Forensic Investigation
- Structural Design:
- Foundation Designs
- Pre-formed Concrete Design
- Retaining Wall Design
- Landfill Design and Support:
- Landfill and Transfer Station Design and Permitting
- Water Quality Monitoring and Reporting
- Annual Volume Surveys and Reporting
Clients/Sectors
We work with a multitude of sectors including:
- Government
- Municipal
- Schools
- Military
- Commercial / Industrial/ Retail
- Infrastructure
- Telecommunication
- Energy
- Utilities
- Residential
- Construction
- Recreation
The Beginning. Summit Geoengineering Services (SGS) began in 1998 as a subsidiary of Summit Environmental Consultants (SEC) under the direction of Bill Peterlein. The purpose was to expand SEC’s capabilities by providing geotechnical consulting. In May 2010, Bill Peterlein and Craig Coolidge purchased SGS from SEC and began operating as an independent geotechnical consulting firm.
New Capabilities. In 2012, SGS expanded to include field exploration services with the addition of a drill rig (AMS rubber track direct push/auger) equipped with cone penetration testing (CPT) capabilities. SGS’s soils laboratory testing services followed soon after. SGS now has a fleet of drill rigs and a Kubota Excavator to provide a full range of drilling and test pit capabilities.
Today. Today SGS operates as a comprehensive geotechnical consulting firm that services northern New England clients from our headquarters’ office in Gardiner/Farmingdale, Maine and our drilling operations office in Washington, Maine. SGS continues to expand its exploration and consulting/design services with highly qualified professionals to best serve our clients.
The Future. In 2026, SGS added a 3rd principal partner, Lisa Turner, to help lead SGS into the future with additional sector support including permitting and landfill design and support.