Geosyntec Consultants, Inc.

Geosyntec Consultants, Inc. (doing business as GCI) is an environmental consulting and engineering firm headquartered in Boca Raton, Florida, that delivers environmental remediation, site assessment, compliance engineering, expert witness and litigation support, and research-and-development services to federal agencies as a prime contractor (74% of recent awards) and subcontractor. The vendor competes in full-and-open competitions without set-aside designations across its entire federal portfolio.

GCI's customer concentration is dominated by two agencies that account for 66% of awards by count and 89% of combined potential value. The National Aeronautics and Space Administration Kennedy Space Center leads with 61 prime awards valued at $136 million, primarily under NASA's Basic Ordering Agreement NAS1003003 (37 task orders, $10 million combined potential value) and two IDIQs (NNK09CA02B with 23 task orders, $13 million; NNK12CA13B with 23 task orders, $12.4 million). The Department of the Army Corps of Engineers Humphreys Engineer Center Support Activity ranks second with 61 awards at $22.9 million combined potential value, reflecting GCI's active engagement with the Strategic Environmental Research and Development Program (SERDP) and the Environmental Security Technology Certification Program (ESTCP). The Department of the Air Force Civil Engineer Center anchors $16.5 million across three awards, including a $14.7 million delivery order for Base Integrated Environmental Support Tasks III performed in Warner Robins, Georgia, through March 31, 2030. The Department of Justice Civil Division and Environment and Natural Resources Division together hold eleven awards at $4.3 million, concentrated in expert witness services on time-and-materials contracts. NASA (agency-wide) contributed $14 million across five awards.

GCI's primary federal vehicle holdings comprise the OASIS+ Unrestricted IDIQ (GSA Federal Acquisition Service, $999,999,999,999 ceiling, awarded April 15, 2025, through April 14, 2030), which serves as a multi-agency MAC with task orders flowing from the Air Force Civil Engineer Center, National Science Foundation, and Department of Justice. GCI also holds a GSA Multiple Award Schedule contract ($6 million ceiling, awarded December 20, 2021, through December 19, 2026) covering environmental consulting, engineering, GIS, and remediation services with place of performance nationwide and internationally. Under the MAS vehicle, GCI issued a $119.5 thousand delivery order from the U.S. Fish and Wildlife Service Region 8 in September 2025 for environmental compliance and brownfield pre-development investigation work plans in Boca Raton, Florida, and a $265.6 thousand delivery order from the U.S. Army Corps of Engineers in January 2024 for environmental inventory services at Elmendorf Air Force Base, Anchorage, Alaska.

GCI's core capability portfolio centers on per- and polyfluoroalkyl substances (PFAS) remediation and treatment technology development, environmental site assessment and restoration, environmental compliance engineering, expert witness consulting for DOJ litigation, and research support for defense environmental programs. Representative prime contracts include a $4.98 million NSF Convergence Accelerator Phase 2 award for bio-inspired and biocatalytic degradation of "forever chemicals" (July 8, 2025, through July 7, 2028, performed in Costa Mesa, California); a $2.28 million ESTCP contract for field-scale assessment of UV/silica-based granular media PFAS treatment in concentrated liquids (awarded September 17, 2024, completing September 16, 2028); a $2.4 million ESTCP contract for development of injectable fuels for in situ PFAS treatment via smoldering combustion (awarded March 6, 2023, through March 5, 2027, performed in Highland Beach, Florida); a $1.1 million SERDP contract for critical data assessment of marine PFAS toxicity and bioaccumulation (awarded July 12, 2023, through July 11, 2027); a $650 thousand NSF Convergence Accelerator 2023 Cohort award for equitable water solutions, chemical sensing, and bio-inspired design (awarded January 24, 2024, through April 30, 2025); and a $4.59 million Other Transaction Agreement from the Department of Defense Office of the Secretary of Defense for wastewater collection, treatment, and disposal research and engineering services (awarded July 11, 2023, through April 30, 2026). GCI also delivers $249.9 thousand and $157.8 thousand time-and-materials expert witness orders from DOJ Civil Division and Environment and Natural Resources Division respectively (both awarded August 2026, extending through 2028–2031).

Recent activity has grown substantially — from six awards in 2022 to thirty in 2024 — before moderating to twenty-nine in 2025 and seventeen year-to-date through August 2026. The vendor faces a recompete cliff of fourteen awards (combined potential value $16.1 million) with ultimate completion within the next twenty-four months, concentrated in SERDP and ESTCP research contracts and expert witness engagements. Across SCI-reportable prime service contracts above the $150,000 threshold, GCI invoiced $1.1 million over FY2022–FY2025, with FY2024 invoicing of $496 thousand (0.8 FTEs) and FY2025 invoicing of $379 thousand (0.3 FTEs). On prime SCI contracts, GCI-paid government rates ran at a median of $254.97 per hour, with the 10th percentile at $180.61 per hour and the 90th percentile at $317.41 per hour; GCI self-performed all SCI-reported hours across prime contracts with no subcontractor labor reported.

GCI operates as a prime contractor on 74% of its awards, with 26% flowing through subcontractor engagements. As a subcontractor, GCI delivers environmental remediation, PFAS investigation and treatment support, and technical consulting across multiple prime relationships. Recent sub-award primes include Ch2M Hill (environmental restoration, PFAS pilot testing, and Navy CLEAN program technical support across multiple 2024–2026 awards), Research Triangle Institute (STREAMS IV ETSC support, ongoing through 2026), Oregon State University (SERDP ER24-4250 biomimetic chromatography for PFAS bioaccumulation assessment, 2026), Auburn University (SERDP ER23-3620 abiotic and biotic PFAS transformation research, 2024–2025), Trustees of the Colorado School of Mines (SERDP ER23-3724 PFAS leaching from AFFF-impacted construction materials, 2024–2025; ESTCP ER23-8372 ex situ PFAS-impacted soil and sediment treatment, 2024–2025), Jacobs Engineering Group (SERDP ER21-3574 R&D and Lower Snake River water supply study, 2024–2025), AECOM Technical Services (Vandenberg Space Force Base laboratory services and Superfund site bench studies, 2024–2025), CDM Federal Programs Corporation (Superfund remedial investigation and feasibility study technical support, 2023–2024), and Trevet-Noreas JV and Trevet-Bay West Joint Venture (Navy PFAS remedial investigations and basewide radiological assessments at San Diego installations, 2024–2025). GCI also sub-receives federal research grants from the City of Oklahoma City (EPA brownfields assessment and cleanup work, 2024–2026), Florida State University (SERDP ER23-3798 bioremediation of 1,4-dioxane research, 2024), George Washington University (SERDP ER21-1070 activated carbon sorptive barrier PFAS remediation, 2023–2024), and the Massachusetts Department of Environmental Protection (watershed-based planning tools, 2024).

The vendor holds twelve named subsidiaries including Geosyntec Consultants International Inc., Aspect Consulting LLC, Longenecker & Associates LLC, MMI Engineering Inc., and Gradco LLC, reflecting acquisition-based portfolio expansion in environmental consulting and engineering capabilities. GCI competes across 41 distinct federal agencies without SBA set-aside positioning, anchoring its competitive posture to technical capability and incumbency on high-value IDIQ and MAC vehicles with repeat ordering across NASA Kennedy Space Center, Army SERDP/ESTCP, and DOJ litigation-support programs.