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Underground Fuel Storage

UST systems engineered for compliance, site-specific configuration, and long-term operational reliability.

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What is Underground Fuel Storage?

 

Underground fuel storage goes beyond burying a tank. It is a site-engineered system where soil conditions, groundwater depth, burial clearances, and access point placement all dictate how the tank is specified, configured, and installed. Burying the tank removes it from the surface footprint, reduces exposure to ambient temperature swings, and keeps fueling infrastructure less obtrusive to the surrounding site. Common installations include fleet fueling depots, backup generator supply, commercial and industrial facilities with onsite fueling needs, construction staging areas, and remote operations where a permanent underground system supports long-term fuel availability. 

 

Getting fill connections, vent outlets, monitoring ports, and manway risers coordinated with surface grading and site circulation before excavation begins is what separates a clean installation from expensive rework. Every variable, from product type to local AHJ requirements, needs to be resolved before the tank goes in the ground. 

Who Works In This Field?

Facility engineers often oversee fueling depot replacements and system upgrades at active sites. Environmental compliance leads manage EPA 40 CFR Part 280 requirements and help keep projects aligned with regulatory obligations across one or multiple locations. Project managers coordinate excavation, delivery, and installation while working around day-to-day operations. No matter the role, the focus is usually the same: choosing a tank system that meets code, fits the site, and supports safe long-term access for monitoring, maintenance, and use.

The Problem They Face

Underground fuel projects carry coordination risks that surface installations do not. Water table conditions can change your anchoring requirements. Permitting and AHJ review timelines vary by jurisdiction and can stall a project if submittals are not prepared early. Access points that are not planned into the configuration before installation become costly retrofits once the tank is backfilled. The margin for error is narrow, and the cost of getting it wrong compounds quickly once excavation starts.

Helpful Codes & Regulations

Underground fuel storage projects operate within a broader framework of industry standards, installation practices, and jurisdiction-specific permitting requirements. The references below represent general guidelines commonly associated with this application. Applicable requirements for any given project will depend on the stored product, installation location, and the authority having jurisdiction. Project teams should confirm which standards and regulations apply early in the planning process before scope and submittal packages are finalized. 


  •  UL 1316 - Covers design, construction, inspection, and testing of factory-coated bolted carbon steel tanks.  

  •  PEI RP 100 - Recommended installation practices for underground liquid storage systems in the field.  

  •  EPA 40 CFR Part 280 - Federal regulatory framework governing underground storage tanks storing petroleum products. 

  •  NFPA 30 / 30A - Fire protection standards for flammable liquid storage and service station applications. 

  •  API RP 1615 - Recommended practice for the installation of underground petroleum storage systems. 

Specialist Support for Your Storage Project

Talk with a specialist for practical guidance and equipment recommendations.

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Frequently Asked Questions

Common questions about underground fuel storage requirements, tank selection, and project planning.

How do I size an underground fuel storage tank?

Sizing is driven by your fuel volume requirement, draw rate, resupply frequency, and site access for delivery vehicles. Sites with limited delivery windows or high consumption rates typically need larger capacity to avoid operational disruption. A Sales Specialist can help you work through the numbers based on your specific site and fueling demands.

What permitting is typically required for underground fuel storage?

FRP resists corrosion from both the stored product and surrounding soil without cathodic protection, which eliminates a significant long-term maintenance cost. For most underground fuel applications, FRP offers a lower total cost of ownership over the service life of the system.

Why is FRP preferred over steel for underground fuel storage?

Requirements vary by jurisdiction and depend on the stored product, site classification, and the local regulatory authority. Most projects require some level of AHJ or environmental agency review, and submittals typically include product specifications and installation documentation. Confirm requirements with your local authority early in the planning process.

What access points need to be planned before installation?

At minimum: fill connections, vent outlets, monitoring ports, and manway access risers. These must be positioned and sized before the tank goes in the ground. Coordinating access placement with surface grading and site circulation early prevents rework after excavation.