Rajan Wilcox
Removing an underground fuel tank is a complex process that requires careful planning and execution to ensure safety and compliance with regulations. The process typically involves multiple steps, including emptying the tank, cleaning it, making it temporarily safe by inerting, excavating the surrounding soil, and finally removing the tank itself. The removal process is regulated by state and federal agencies due to the potential environmental hazards and contamination risks associated with improper removal. Proper disposal of waste materials, such as excavated soil, tank contents, and cleaning water, is essential, and specific documentation and reporting requirements must be met. Before initiating the removal process, it is crucial to determine if there are any signs of leakage or contamination, as these issues can pose serious risks to both the property and the environment.
Underground Fuel Tank Removal Process
| Characteristics | Values |
|---|---|
| Removal Process | The removal process varies from state to state. Some states require a licensed contractor to execute the process. |
| Removal Requirements | Underground storage tanks cannot be abandoned and must follow proper environmental assessments and closure procedures. |
| Removal Reasons | Tanks may be removed due to facility upgrades, tank failure, incompatibility with future products, or the system no longer storing petroleum. |
| Pre-Removal Steps | Before removal, the tank must be closed, emptied of all contents, and cleaned to prevent any environmental contamination during the removal process. |
| Inerting | The tank is made safe by replacing oxygen with non-explosive gases like nitrogen or carbon dioxide. |
| Excavation | The soil around the tank is dug up to access the tank and its dispensers or product lines. The area is secured to restrict traffic and pedestrians. |
| Contamination Inspection | A certified groundwater professional (CGP) observes the excavation for signs of petroleum contamination. Any evidence of contamination must be reported to the state regulatory agency within 24 hours. |
| Soil and Water Sampling | Soil samples are collected from beneath the tank, product delivery lines, and dispensers. Water samples are taken if groundwater is present during excavation. |
| Waste Disposal | The certified remover is responsible for proper disposal of waste materials, including excavated material, tank components, fuel, sludge, and cleaning water. |
| Transportation and Disposal | Waste materials must be transported and disposed of using licensed and permitted facilities. Tanks must be labeled with hazard warnings, previous contents, and the removal date before transport. |
| Reporting and Documentation | A closure report is submitted, including analytical information from samples, disposal documentation, soil disposal details, and a map of sample locations. |
| Record Retention | UST removal records should be retained to facilitate future property transactions and comply with state requirements. |
| Leak Indications | Increased fuel consumption, dying vegetation above the tank, an oily sheen on water, heating oil odor, and changes in water taste or smell may indicate a leaking tank. |
| Exceptional Cases | If the tank is beneath a building's foundation, it may be filled with inert material like polyfoam or concrete slurry instead of removal to avoid structural damage. |
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What You'll Learn
- Prepare the tank by removing all contents and cleaning it thoroughly
- Make the tank inert to prevent explosions and vapours
- Excavate the soil around the tank for access and prepare for removal
- Remove the tank and dispose of all waste materials responsibly
- Take soil and groundwater samples to check for contamination
Prepare the tank by removing all contents and cleaning it thoroughly
Preparing and cleaning an underground fuel tank for removal is a complex process that requires careful planning and execution. Here are the key steps to ensure thorough preparation and cleaning:
Firstly, it is essential to empty the tank completely. This includes removing all fuel, sludge, debris, and any other contents that may have accumulated at the bottom of the tank. The tank should be emptied as much as possible, ideally down to 1 inch or less from the bottom. This step is crucial to prevent any product release into the environment during the subsequent removal and excavation stages.
Once the tank is emptied, the next step is to clean it thoroughly. This process aims to remove any residual fuel, sludge, or contaminants from the tank's interior surfaces. It may involve using specialised cleaning equipment, such as confined space entry tools and lighting solutions, to access and effectively clean all areas of the tank. Given the hazardous nature of the task, it is imperative to ensure proper ventilation and follow safety protocols to mitigate the risks associated with hazardous fumes.
During the cleaning process, it is important to manage any waste generated responsibly. This includes the proper disposal of not only the contents removed from the tank but also the water used for cleaning and any contaminated soil resulting from the cleaning process. All waste must be handled, transported, and disposed of in accordance with federal, state, and local regulations. This typically involves using licensed transporters and disposal facilities and submitting manifests to certify the proper handling and disposal of hazardous waste.
Additionally, it is important to address any plumbing issues or signs of moisture accumulation, as these can lead to groundwater contamination and microbial growth within the tank. By proactively identifying and rectifying these issues, you can help prevent future problems and ensure the long-term sustainability of the tank, even after it has been removed from service.
Finally, once the tank is empty and cleaned, it must be made temporarily safe by inerting the tank. This involves replacing the oxygen within the tank with a non-explosive gas, such as nitrogen or carbon dioxide. Inerting the tank reduces the risk of explosion or fire during the subsequent removal and excavation processes, creating a safer work environment for contractors and personnel.
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Make the tank inert to prevent explosions and vapours
Removing and decommissioning underground fuel tanks is a complex process that requires careful planning and execution to ensure safety and compliance with regulations. One of the most critical steps in this process is making the tank inert to prevent explosions and vapours. Here are the key steps and considerations involved in this process:
Firstly, it is essential to understand the dangers associated with underground fuel tanks. Over time, fuel storage tanks can corrode or rust due to chemical reactions and other contaminants. This can lead to leaks, spills, and overfills, which can result in the release of hazardous and toxic chemicals into the environment. These releases pose a serious threat to human safety and health, as fumes and vapours can travel underground and collect in enclosed spaces, creating the risk of explosion, fire, and asphyxiation. Therefore, removing and making inert any underground fuel tank that is no longer in use is crucial.
The process of making an underground fuel tank inert typically involves removing explosive vapours and fire hazards. This step is often referred to as "purging" or "inerting". It is a critical safety measure to create a safe working environment and prevent accidents, explosions, and fires during the removal process. The removal of flammable vapours can be accomplished through various methods, including extracting volatile vapours through a vent or filling the tank with inert gases, water, or inert materials such as sand, foam, or concrete.
One commonly used method for inerting is to line the bottom of the tank with dry ice (solid carbon dioxide). This technique helps remove oxygen, one of the critical elements of the fire triangle. The industry standard recommends using a minimum quantity of 15 to 20 pounds of dry ice per 1,000 gallons of the tank's capacity. After inserting the dry ice, it is essential to monitor the oxygen levels and the lower explosive limit (LEL) in the tank's atmosphere using a calibrated air quality meter. According to regulations, a tank is considered safe for removal when oxygen levels are below 5% or the LEL is 10% or lower.
In some cases, alternative methods may be employed to make the tank inert. For example, small amounts of warm water or environmentally friendly, non-toxic cleaning products may be added to suppress hydrocarbon molecules and render flammable liquids and vapours non-flammable. This technique is known as encapsulation. Additionally, shading the tank from direct sunlight or scheduling tank removals for above-freezing temperatures can also help prevent issues with dry ice sublimation.
It is crucial to note that the removal and inerting of underground fuel tanks should be handled by professionals with experience and expertise in this field. They will ensure that all necessary safety precautions are taken and that the work complies with local regulations and safety standards. Before removing an underground fuel tank, it is mandatory to notify local authorities, who will verify that the work performed adheres to safety regulations.
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Excavate the soil around the tank for access and prepare for removal
Excavating the soil around an underground fuel tank is a crucial step in the removal process, but it requires careful planning and execution to ensure safety and compliance with environmental regulations. Here are the key considerations and steps involved in excavating the soil around the tank for access and preparation for removal:
Firstly, it is essential to determine the contents of the tank and identify any potential hazards. Underground storage tanks often contain flammable or combustible materials, such as gasoline and oil, which pose significant risks if not properly handled. Understanding the tank's contents will help in developing a safe excavation plan.
Before any excavation work begins, the site must be prepared. This includes setting up road signs and bringing in the necessary equipment. It is also crucial to ensure that the area is secure and that no unauthorised personnel, including bystanders, are allowed within the work zone during the entire removal process.
The actual excavation process involves removing the soil above and around the tank to access it. This step typically requires heavy machinery and should only be performed by experienced contractors. The soil removal provides easier access to the top of the tank and its associated dispensers or product lines.
During the excavation process, it is essential to monitor the area for any signs of leaks or contamination. Underground storage tanks can deteriorate over time, corrode, or develop structural issues, leading to potential leaks. If a tank has been leaking, the surrounding soil is likely to be contaminated and must be properly handled and disposed of according to federal and state guidelines.
Soil sampling is a critical aspect of the excavation and removal process. Detailed soil samples help experts assess the extent of contamination and determine if additional cleanup measures are necessary. This step ensures that the site is safe and mitigates potential environmental and health risks.
Finally, it is worth noting that there are situations where removing the tank through excavation may not be the best option. If the tank is beneath a building's foundation, excavation can compromise the structural integrity of the building. In such cases, contractors may opt to fill the tank with a non-shrinking, solid, inert material, such as polyfoam or concrete slurry, to abandon it safely.
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Remove the tank and dispose of all waste materials responsibly
Removing an underground fuel tank is a complex process that requires careful planning and execution to ensure safety and compliance with regulations. Once you have made the tank inert and safe to work on, the next step is to carefully remove the tank and dispose of all waste materials responsibly.
Firstly, it is imperative to engage a certified remover who is responsible for the proper disposal of all waste materials generated during the process. This includes excavated material, non-salvageable storage system components, the tank itself, any fuel or sludge in the tank, and the water used to clean the tank. The certified remover must also ensure that all waste material is transported and disposed of using licensed and permitted facilities. Before transportation, the tanks must be labelled with hazard warnings, previous contents, and the date of removal.
The removal process must be carried out in accordance with federal, state, and local regulations. Some states mandate that a licensed contractor executes the removal. It is important to follow the specific guidelines of your state, including any requirements for soil and water sampling, disposal documentation, and reporting. For example, if there is groundwater in the excavation, water samples must be collected, and any evidence of petroleum release into the environment must be reported to the relevant authorities within a specified timeframe.
In some cases, it may be necessary to fill the tank with a non-shrinking, solid, inert material such as polyfoam or concrete slurry, especially if the tank is beneath a building's foundation and excavation could cause harm to the structure. This method ensures the tank remains stable and does not pose a risk of contamination to the surrounding area.
The proper disposal of waste materials is crucial to prevent environmental contamination and ensure the safety of the surrounding area. This includes the responsible handling and disposal of any hazardous materials, such as contaminated soil, in accordance with federal and state guidelines.
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Take soil and groundwater samples to check for contamination
When removing an underground fuel tank, it is crucial to take soil and groundwater samples to check for contamination. This process helps address environmental pollution concerns and ensures that any fuel leaks or spills have not caused soil or groundwater contamination. Here are the key steps and considerations for taking these samples:
Soil Sampling
Soil sampling is necessary to identify any fuel leaks or spills that have contaminated the soil. Geologists collect samples from underground to assess the extent of contamination. This process is complex, as hundreds of factors contribute to how contamination occurs and spreads. The molecular and physical properties of the chemicals, such as density and evaporation rates, play a significant role. Additionally, temperature, pressure, and moisture levels in the soil can influence how chemicals react during migration.
Groundwater Monitoring
Groundwater monitoring is essential to detect fuel leaks before they reach the groundwater. Monitoring wells, typically 2-4 inches in diameter, are installed to detect liquid petroleum products in the groundwater. These wells must be properly designed, sealed, marked, and secured to prevent external contamination. According to the EPA, if groundwater monitoring is the sole method of leak detection, the groundwater level should not exceed 20 feet below the surface, and the soil between the well and the tank should be coarse, such as sand or gravel.
Laboratory Analytics
Soil and groundwater samples are analysed in laboratories to detect total petroleum hydrocarbons (TPH) and volatile organic compounds (VOCs). These tests help determine the presence and levels of contamination.
Certified Groundwater Professional (CGP)
When removing underground fuel tanks, it is mandatory to engage a CGP to collect soil and groundwater samples. Their expertise ensures accurate sampling and analysis, and their observations during the excavation help identify any obvious signs of petroleum contamination.
Regulatory Requirements
The removal of underground fuel tanks and contamination assessment are subject to state and federal regulations. The tank owner or operator is responsible for following specific processes, including proper environmental assessments and closure procedures. All waste materials generated during the removal process must be properly disposed of by certified removers, and manifests must certify the proper transport and disposal of these materials.
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Frequently asked questions
There are several signs that your underground fuel tank may be leaking and needs to be removed. These include an increase in fuel consumption, dying grass and vegetation above the tank, a sheen on the water surrounding the tank, the smell of heating oil, and changes in your water supply.
Before removing your underground fuel tank, you must empty it of any remaining fuel and clean it thoroughly to ensure no fuel is left behind. You may also need to obtain the proper permits and notify the relevant state regulatory agency.
The removal process should be carried out by a certified remover or licensed contractor. They will make the tank safe by removing flammable vapours, then excavate the soil around the tank and remove it from the ground.
The certified remover is responsible for the proper disposal of all waste materials. They must also submit manifests certifying the transport, receipt, and disposal of waste materials, along with a closure report including analytical information from soil and groundwater samples.
