Passion For Excellence
Earth materials are complex and building in them can be challenging and risky. Working with these materials is what we do every day and we love to do it. Our passion for excellence translates directly into successful projects.
Although they didn’t know it, the Lithos Engineering team began to assemble well before the company was created. In 2007 Nate and Benny worked for a Denver-based Geotechnical and Trenchless firm where they learned to provide excellent engineering support on subsurface projects and establish professional relationships with the local engineering firms, owner organizations, and construction companies. In 2010 the local firm was acquired by a national-focused firm, introducing Nate and Benny to Robin who all became partners in the acquiring firm. In 2010 Robin first met Lance and was fortunate to be able to hire him in 2012.
Out of a desire for more sense of community, the four geotechnical and geological engineering professionals started Lithos Engineering to serve their local communities by providing clients and projects with recognizable value through prudent site evaluations, constructible solutions, and an understanding of project risks. Lithos focuses on tunnel, trenchless, geotechnical, and geological engineering and design services through innovative, collaborative, client focused consulting uniquely tailored to suit the needs of our clients and their projects.
Where does the name Lithos come from?
Quite simply, it is where society lives, works and plays. The Lithosphere is a geologic term for the crust and upper mantle of the earth. The name Lithos encapsulates the team’s passion for what they do, underground engineering. Lithos Engineering takes pride in understanding ground behavior when working in and under it.
Mr. Dornfest is the president of Lithos Engineering. He specializes in engineering geology and geotechnical engineering as they relate to water and wastewater, oil and gas, transportation, aggregate producers, mining, and water supply and irrigation. Typically, his projects involve geotechnical/geologic investigations, pipeline alignments and crossings, geologic hazard evaluation and mitigation design, small dam design, permanent and temporary earth retention systems, groundwater control, oil and gas pipelines and facilities, highways and bridge construction, commercial and industrial developments, and land development projects. With 17 years of experience, he has technical expertise in engineering geology, geotechnical engineering, slope stability, expansive soils, ground modification, earth retention systems, landslide and rock fall evaluation and mitigation, embankment dam design, groundwater control systems including slurry walls and dewatering well systems, and tunneling and trenchless projects. In addition, Mr. Dornfest has served as an expert witness and provided testimony, evaluated differing site condition claims, and regularly provides value engineering services to numerous client and project types.
Mr. Soule has 15 years of experience in a variety of tunneling, geotechnical, and geological engineering projects. His focus is primarily on tunneling and trenchless engineering and is also constantly involved with more traditional geotechnical projects. Tunneling and trenchless engineering experience includes project management, tunnel design, feasibility analysis, geologic exploration, and contract document preparation. He also assists in plan and specification reviews and litigation support for projects across the country involving both tunnels and other types of construction. Other interests and areas of experience include cementatious grouting and support for hard-rock aggregate quarries.
Mr. Siljenberg is a vice president of Lithos Engineering. He has 15 years of progressive experience in a variety of geotechnical, tunneling engineering and construction projects where he has provided benefit to projects for the owners’, contractor’s and prime engineer’s team. His diverse experience allows him to understand a project from all points of view and provide value to each project by considering how individual aspects will affect the overall project. Early in his career his primary focus on design and construction experience with civil structures such as pipelines, water and wastewater treatment plants and reservoirs that is beneficial as he focuses on developing teams, business and pursuits related to the these features.
Lance Heyer has 7 years of experience as a Geotechnical and Structural Engineer and is an associate at Lithos Engineering. Mr. Heyer has worked on and managed a variety of geological and geotechnical engineering projects with specific tasks including: subsurface explorations; review and analysis of internally and externally collected geotechnical data; geotechnical and structural design; and preparation of geotechnical engineering reports for private clients and regulatory applications. As a geotechnical engineer, Mr. Heyer has conducted geotechnical evaluations for tunnels, retaining walls, shallow and deep foundations, levees, and dams. More specifically, Mr. Heyer has over 4 years of experience designing and observing construction for jurisdictional and non-jurisdictional dams, levees, and other water storage and augmentation sites.