Business Details
41 Years
experience
Trusted Geotechnical & Environmental Drilling Services
Gregg Drilling has established itself as a leader in geotechnical and environmental drilling services, delivering high-quality solutions for over four decades. Founded in 1985, we specialize in site investigations, cone penetration testing, well installation, and remediation services across California and the Western United States. Our commitment to safety, innovation, and client satisfaction is reflected in our Gold Shovel Certification and extensive safety training programs. We pride ourselves on utilizing advanced equipment, including in-house designed CPT trucks with 30-ton push capacity, to address complex subsurface challenges.Our team of experienced professionals, many of whom have worked with us for decades, ensures projects are completed efficiently, safely, and with minimal environmental impact. As a 100% Native American-owned business under Sealaska, we integrate cultural values with technical expertise to provide trusted services for government agencies, industrial clients, and engineering firms. Our focus on continuous improvement has earned long-term partnerships with clients who rely on our expertise for critical infrastructure and environmental remediation projects.
Services
Cone Penetration Testing
Hollow Stem Auger Drilling
Rotary Drilling
Sonic Drilling
Well Installation
Utility Clearance
Remediation Services
Marine Drilling
Geotechnical Testing
Advanced Site Characterization
Details
- Year established: 1985
Highlights and features
- We have over 40 years of experience in geotechnical and environmental drilling.
- Our team holds Gold Shovel Certification for safety excellence.
- We offer in-house designed CPT equipment with 30-tons of push capacity.
- Our personnel are trained to work on refineries, military sites, and confined spaces.
- We provide 24/7 project support with real-time data presentation.
Associations and certifications
- Gold Shovel Standard
What people say
Best team I've ever worked with
Incredible safety rating
Highly valuable Field Day
Positive experience
Excellent communication
Services
Cone Penetration Testing
Gregg Drilling provides cone penetration testing (CPT) using truck and track-mounted equipment with 30-ton push capacity. Our systems include standard trucks, off-road vehicles, and portable ramset equipment for diverse site conditions. Real-time data presentation and on-board washrooms enhance field efficiency, while support trucks handle decontamination and concrete coring to improve productivity.
Hollow Stem Auger Drilling
We deploy hollow stem auger rigs for shallow borings up to 250ft depth, ideal for environmental well installations and geotechnical sampling. Truck and track-mounted rigs accommodate urban and off-road locations, with automatic SPT hammers for soil testing. This method offers a cost-effective solution for monitoring wells and stratigraphic analysis.
In-situ Remediation
Our remediation services include high-performance injection systems for ISCO, ERD, and bioremediation. Custom mobile rigs deliver reagents at 0.1-100 GPM and 0-1500 PSI, with multi-point manifolds for simultaneous injection across 20 locations. We integrate HRSC data to optimize compound placement in diverse lithologies.
Well Installation
Gregg Drilling handles full-cycle well services from permitting to abandonment. We install environmental monitoring wells, water production wells, and groundwater extraction systems using Smeal 5/8-ton and MARL rigs. Services include development, rehabilitation, pump installation, and video logging for municipal and industrial clients.
Marine Drilling
We conduct near-shore and inland marine investigations using the R/V Quin Delta drill ship, modular barges, and jack-up platforms. Capabilities include geotechnical sampling, seismic CPT, and soil coring in ports, rivers, and reservoirs. Our team has completed projects in California, Alaska, Canada, and Mexico with specialized marine equipment.
People
Tim Boyd
President
Tim Boyd oversees Gregg Drilling's operations with expertise in geotechnical and environmental site investigations. He has managed offshore and inland marine projects globally, including deepwater geotechnical work for oil and gas clients. His academic background in CPT methods informs strategic leadership.
Mike Haske
Health and Safety Manager
Mike Haske directs Gregg's HSE programs, ensuring compliance across on-land and over-water operations. With extensive experience in environmental remediation and safety management, he maintains the company's Gold Shovel Certification and trains crews for high-risk environments.
Frank Velazquez
Southern California Operations Manager
Frank Velazquez supervises Southern California operations with 13 years of drilling equipment expertise. He coordinates project logistics, safety compliance, and crew management to ensure timely execution of complex geotechnical and environmental projects.
Joe Contreras
Project Manager - Hollow-Stem Auger
Joe Contreras manages hollow stem auger and direct push projects with 32 years of field experience. His expertise in equipment operation and project scheduling ensures efficient delivery of environmental and geotechnical drilling services across California.
David Moses
Northern California Operations Manager
David Moses leads Northern California operations, overseeing drill crews and direct-push well installations. With 13 years at Gregg, he combines technical knowledge with operational leadership to maintain high productivity and safety standards.
Questions
What services does Gregg Drilling offer?
Gregg Drilling provides geotechnical drilling, cone penetration testing (CPT), well installation, environmental remediation, marine drilling, and utility clearance services for infrastructure, environmental compliance, and subsurface investigations.
Which areas do you serve?
We operate throughout California and surrounding states including Arizona, Nevada, New Mexico, Oregon, and Washington, with marine capabilities extending to Alaska and Mexico.
Are your crews certified for safety?
Our teams hold Gold Shovel Certification, and all personnel complete extensive safety training for work on refineries, military sites, railroads, and confined spaces.
How do you handle complex drilling challenges?
We deploy specialized equipment like track-mounted CPT rigs, sonic drilling systems, and modular barges to address difficult access, offshore environments, and contaminated sites.
Can you assist with emergency projects?
While we don't offer 24/7 emergency services, our rapid mobilization teams typically respond within one business day for urgent drilling and remediation needs.
