Geotechnical and Trenchless Engineering Services
DCM Consulting, Inc. provides professional geotechnical and trenchless engineering services to public and private sector clients throughout California. Founded and led by David C. Mathy, a registered Civil and Geotechnical Engineer with decades of specialized experience, the practice supports pipeline, pump station, water treatment, and deep excavation projects. Its core capabilities span trenchless technologies, ground improvement, excavation shoring, dewatering, and construction claims evaluation.
David C. MathyPrincipal
Comprehensive geotechnical investigations and engineering analyses for infrastructure, buildings, and specialized civil works.
Geotechnical investigations and design recommendations for shallow and deep foundations, including footings, mats, post-tensioned slabs, drilled piers, and driven piles.
Engineering and support for ground treatment processes such as dynamic compaction, stone columns, jet grouting, soil mixing, compaction grouting, and lime treatment.
Analysis and design support for construction excavations, including braced and tied-back shoring and temporary or permanent dewatering systems.
Specialized engineering and consulting for pipeline installations using advanced trenchless technologies.
Evaluation of site development history, geologic settings, and geotechnical conditions to assess feasibility, analyze routing alternatives, and estimate preliminary costs.
Consulting and support for specific trenchless methods including microtunneling (MTBM), earth pressure balance machine (EPBM) tunneling, horizontal directional drilling (HDD), and guided boring.
Preparation and review of geotechnical data reports (GDR), geotechnical interpretive reports (GIR), geotechnical baseline reports (GBR), and trenchless construction specifications.
Design investigations and rehabilitation planning for municipal utility pipelines.
Geotechnical investigations for conventional and trenchless pipeline installations, spanning water, wastewater, recycled water, storm drain, and fiber optic systems.
Engineering evaluations and design support for pipeline rehabilitation methods including pipe bursting, pipe reaming, slip-lining, and cured-in-place pipe (CIPP).
Construction claims analysis and dispute resolution support specializing in underground infrastructure.
Technical evaluation of construction claims, analyzing site conditions, and assessing the validity of claims related to differing site conditions.
Expert technical testimony and advisory services for legal and contractual disputes in pipeline and trenchless construction projects.
Water Supply · Wastewater · Stormwater & Flood Control · Infrastructure · Telecommunications
Concord, CA · Client: Central Contra Costa Sanitary District (CCCSD)
Geotechnical and tunneling support for the installation of approximately 3,000 feet of 96-inch internal diameter concrete pipe using a 116-inch Akkerman earth pressure balance machine (EPBM) tunneling machine.
Lafayette, CA · 2011 · Client: Central Contra Costa Sanitary District (CCCSD)
Geotechnical support for the installation of a trunk sewer utilizing a Vermeer AXIS guided bore drill.
Orinda, CA · Client: Central Contra Costa Sanitary District (CCCSD)
Geotechnical and microtunneling design support for the installation of 8,250 linear feet of 36-inch diameter sanitary sewer, which was recognized as Project of the Year.
Napa, CA · 2007 · Client: Napa Sanitation District
Geotechnical investigations and trenchless engineering for a microtunneling installation under the Napa River.