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Drilling and Explorations

Informed infrastructure decisions start with reliable data from below the surface. DLZ provides comprehensive geotechnical drilling and exploration services, delivering the subsurface information that engineers, environmental professionals, and project teams need to design with confidence. With a fleet of drill rigs and specialized equipment, DLZ performs a wide range of drilling methods across demanding site conditions, from dense urban environments to remote and restricted-access locations.

Featured Capabilities

Subsurface Exploration and Soil/Rock Sampling

Quality data starts with quality sampling. DLZ provides continuous soil sampling and rock coring using hollow stem auger, wireline coring, and other proven methods, delivering high-quality subsurface information across diverse site conditions that supports accurate geotechnical analysis and design.

Specialized Drilling Techniques

Not every site is straightforward. DLZ performs rotary, coring, auger, mud, and air rotary drilling tailored to project requirements, with unique capabilities including low-clearance, indoor, angle hole, and remote-access drilling to address complex or constrained site conditions.

Environmental and Monitoring Installations

Subsurface monitoring requires precise installation. DLZ installs monitoring wells, piezometers, and instrumentation systems — including vibrating wire piezometers and dataloggers — to support environmental assessments and provide ongoing tracking of subsurface conditions over time.

In-Situ Testing and Field Investigations

Field data adds a layer of insight that sampling alone can’t provide. DLZ conducts vane shear, slug testing, pressure meter testing, and permeability testing in the field — delivering real-time subsurface performance data that sharpens engineering decision-making.

Construction Support and Specialty Services

DLZ supports construction and rehabilitation efforts with pavement and concrete coring, pressure grouting, and well development. Direct push sampling and cone penetrometer testing round out our advanced site characterization capabilities for projects that demand more from their drilling team.

Related Work

ALCOSAN Preliminary Planning Phases I, II, and III

Pittsburgh

, Pennsylvania

Subsurface Exploration AEP Racine Locks and Dam

Racine

, Ohio

Toledo Veterans Glass City Skyway Bridge, Ohio

Toledo

, Ohio

Related Capabilities

Tim

Hampshire, PE

Vice President

Ohio

Barry

Wong, PE

Vice President, DLZ American Drilling, Inc.