Geo-Ex Subsurface Exploration
Dixon, CA Doing business as GEO Ex Subsurface Exploration
- UEI
- YGBCMSLKYG68
- CAGE
- 790M3
- Primary NAICS
- 237310 Highway, Street, and Bridge Construction
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
- SAM.gov registration date
- Physical address
- 1510 Madera Dr, Dixon, CA 95620, USA
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Shoreline sunnyvale GI study | ENDIST San Francisco | $26,430 | |
| Mcas camp pendleton levee repair | ENDIST Los Angeles | $635,921 | |
| Motco flood control levee | ENDIST Sacramento | $1,380,600 | |
| Special site acceess requirements | ENDIST Sacramento | $564,900 | |
| Soil borings and samplings | ENDIST Sacramento | $55,345 |
About Geo-Ex Subsurface Exploration
Geo-Ex Subsurface Exploration, doing business as GEO Ex Subsurface Exploration, is a small-business prime contractor based in Dixon, California, that provides subsurface drilling, geotechnical investigation, and soil sampling services to the U.S. Army Corps of Engineers as a Subchapter S Corporation under NAICS 541330 (Engineering Services) and 54135 (Geophysical Surveying and Mapping Services). Geo-Ex operates under a total small business set-aside posture and competes predominantly under small-business vehicles.
Geo-Ex's customer footprint is narrowly concentrated on the Army Corps of Engineers across four district offices. The top customer by both award count and potential value is USACE Engineering District Sacramento, which accounts for 12 awards and $22.2 million of the vendor's $23.1 million combined potential value (96% concentration). Remaining work flows through USACE Engineering District Los Angeles ($854 thousand on a single delivery order for MCAS Camp Pendleton levee repair), USACE Engineering District San Francisco ($26 thousand), and a small amount of unspecified Army Corps work ($73 thousand). This concentration reflects Geo-Ex's regional specialization in California infrastructure and flood-control projects.
Geo-Ex holds a $9.9 million multiple-award Indefinite Delivery Contract with USACE Engineering District Sacramento (awarded April 2023, through April 2028) covering comprehensive subsurface investigation services including hollow stem and mud-rotary drilling, soil and rock core sampling, cone penetrometer testing, piezometer installations, and related geotechnical documentation. Four delivery orders totaling $2.9 million have been placed against this IDC to date. Recent delivery-order work includes a $1.38 million order for the MOTCO Flood Control Levee project in Concord, California (awarded September 2024, due September 2025), a $564 thousand order for special-site-access geotechnical services (awarded June 2024, due August 2025), and a $26 thousand definitive contract for the Shoreline Sunnyvale Geotechnical Investigation Study supporting salt pond berm characterization (awarded September 2025, due December 2025). Geo-Ex also sits on the USACE South Pacific Geotechnical Engineering vehicle (2016–2021 period), which supported eight prior task orders worth $867 thousand.
Activity has been episodic, with four awards in 2020, a single award in 2021, two in 2023, four in 2024, and one in 2025. Only $3.8 million (16% of combined potential value) has been obligated to date across the portfolio, indicating most work remains in performance or future option exercise. In its subcontractor capacity, Geo-Ex performed geotechnical services under AECOM Technical Services on the Military Ocean Terminal Concord Class Yard expansion project (October 2023). Geo-Ex's capability set is sharply focused on subsurface exploration, drilling, sampling, and soil characterization work for federal infrastructure, levee repair, and flood-control projects in California, with no diversification to other agencies or service lines evident in the award record.
Contract vehicles
SBA capabilities narrative
Geo-Ex Subsurface Exploration is a registered California Small Business Enterprise (Micro Business), providing drilling services to the geotechnical, environmental and construction industries.For more information visit our website at http://www.geoexsubsurface.com/
Quick answers
What is Geo-Ex Subsurface Exploration's UEI?
Geo-Ex Subsurface Exploration's Unique Entity ID (UEI) in SAM.gov is YGBCMSLKYG68.
What is Geo-Ex Subsurface Exploration's CAGE code?
Geo-Ex Subsurface Exploration's CAGE code is 790M3.
What is Geo-Ex Subsurface Exploration's primary NAICS code?
Geo-Ex Subsurface Exploration's primary NAICS code is 237310 (Highway, Street, and Bridge Construction).
Where is Geo-Ex Subsurface Exploration located?
Geo-Ex Subsurface Exploration's physical address in SAM.gov is 1510 Madera Dr, Dixon, CA 95620, USA.
Is Geo-Ex Subsurface Exploration registered in SAM.gov?
Yes. Geo-Ex Subsurface Exploration's SAM.gov registration is active through January 15, 2027.
Which contract vehicles does Geo-Ex Subsurface Exploration hold?
Geo-Ex Subsurface Exploration holds a place on 1 federal contract vehicle: USACE South Pacific Geotechnical Engineering 2016-2021.
What is Geo-Ex Subsurface Exploration's most recent federal award?
Geo-Ex Subsurface Exploration's most recent federal contract award is Shoreline sunnyvale GI study (W912P725CA024), from ENDIST San Francisco, on September 24, 2025.
On GovTribe
See Geo-Ex Subsurface Exploration's full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Subcontracting relationships
- Funding analysis by agency, NAICS and set-aside
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