UST Soil Sampling and Tank Inspection

Soil Sampling and Tank Inspection Common Questions

A UST Soil Sampling and Tank Inspection is almost identical to a Soil Sample.  The major difference between the two is that besides sampling between 12″ to 24″ beneath the bottom of the tank, the tank itself is opened up and inspected for its contents.

Why would a Tank Inspection be needed?

There are a couple different reasons that it is required to include the additional service of the Tank Inspection to the Soil Sampling, here are a few examples of why that would be needed:

  • During a tank search an underground storage tank was found, yet the technician was unable to get the fill cap off to determine its contents.  The fill cap may be inaccessible due to the cap being covered over, rusted shut or the fill pipe itself is completely filled and the contents of the tank can not be determined.
UST Soil Sampling and Tank Inspection

UST Soil Sampling and Tank Inspection – Tank found under concrete patio, fill cap inaccessible due to patio pavers.

  • The tank had been decommissioned previously but never registered with the DEQ.  In order for the underground storage tank to be registered with the DEQ, the soil beneath the tank needs to be sampled and the contents of the tank need to be verified.

The Tank Inspection

How do you perform a Tank Inspection?

After the tank has been located and marked out for soil sampling, our technicians will dig down to the top of the tank, cut open the tank and verify the contents.

Once the tank has been opened up, what is the best case scenario?

What we always hope for is clean soil samples and a properly decommissioned tank.  With samples below the DEQ reporting level of 50 PPM and a tank filled with clean material, the UST can then be registered with the DEQ.

UST Soil Sampling and Tank Inspection

UST Soil Sampling and Tank Inspection – Properly decommissioned tank filled with a concrete slurry.

What if the tank has been decommissioned with a proper fill material, but not filled all the way to the top of the tank, and the soil samples come back below the DEQ reporting level?

As long as the samples come in below the DEQ reporting level of 50 PPM, the remaining gap can be filled with additional fill material to ensure the tank has been decommissioned properly.  Once the tank has been certified as decommissioned, it can now be registered with the DEQ.

UST Soil Sampling and Tank Inspection

UST Soil Sampling and Tank Inspection – Tank inspection with gap in the proper fill material, tank will be filled with additional fill material and can then be registered with the DEQ

 

What are additional circumstances that are encountered with Tank Inspections?

Fill Material

  • Gap in proper fill material, below reporting level of 50 PPM:  Fill void with additional fill material and the tank can then be registered with the DEQ.
  • Proper fill material, leaking tank above 50 PPM: Tank has been decommissioned properly, remediation is required to determine that the leak has been contained. Once the clean-up is completed, the tank can then be registered with the DEQ.
  • Improper fill material: Improper fill material needs to be removed and the tank re-decommissioned. Additionally, if the tank is leaking above 50 PPM, remediation will need to take place to clean-up the site. Once the new decommissioning is completed, the tank can then be registered with the DEQ.

Water

  • Water in gap of the proper fill material, below reporting level of 50 PPM: Pump water out of the void and fill gap with additional fill material. Tank can now be registered with the DEQ.
  • Water completely fills the tank: Regardless of the fill material, everything within the tank needs to be pumped out and replaced with new fill material. Additionally, if the tank is leaking above 50 PPM, remediation will need to take place to clean-up the site. Once the new decommissioning is completed, the tank can then be registered with the DEQ.
UST Soil Sampling and Tank Inspection

UST Soil Sampling and Tank Inspection – Liquid found inside of opened tank

  • Tank is opened and it is empty.  If the samples come in below 50 PPM, the tank can be decommissioned and registered with the DEQ.  If the samples come in above 50 PPM, the tank can be decommissioned with remediation and then registered with DEQ
UST Soil Sampling and Tank Inspection

UST Soil Sampling and Tank Inspection – Empty tank discovered during a Tank Inspection.

UST Tank Search for Buyers

UST Tank Search for Buyers – Common Questions

As a Buyer, searching for an underground storage tank has become integrated as part of the inspection period. These are some of the most common questions that we are asked regarding the tank inspection process and why it is important to protect yourself before you buy.

What is an underground storage tank (UST)?

Homes, apartments, farms and some businesses that are currently or were previously heated using diesel heating oil, used an underground storage tank (UST) to store the heating oil. The USTs were usually buried in the yard, and copper tubing or steel piping was installed to deliver the diesel from the tank to the furnace. In Oregon, an estimated 100,000 USTs were installed for home heating.

UST Tank Search for Buyers

UST Tank Search for Buyers – Rendition of an underground storage tank (UST) buried in a yard, with the supply lines running into the home.

Why should I worry about a UST?

Underground storage tanks are made of steel, which are selected for their strength, not for their corrosion resistance. Therefore steel USTs rust through, given enough time. Like a roof, steel storage tanks have a life of about 25 years, and like a roof it is cheaper to replace the tank or convert to another heat source before it leaks and the damage is done.

UST Tank Search for Buyers

UST Tank Search for Buyers – Removed tank with numerous holes, this allows the diesel fuel to leak into the surrounding soil.

Performing the UST tank search

How do you find an abandoned UST?

The best way to determine if there is an abandoned oil tank on the property, is to conduct a tank search.

How do you perform a tank search?

EcoTech first will perform a Tank Background Search, this entails a detailed examination of state and local databases, as applicable. Besides years of on-the-job experience, our technician conducts a visual inspection for product lines and fill or vent pipes, utilizes metal detectors and Terra, our specially trained Petroleum Detection K-9.

UST Tank Search for Buyers

UST Tank Search for Buyers – Terra finds a tank

UST Tank Search for Buyers

UST Tank Search for Buyers – The UST Terra found during the tank search, is now marked out for sampling.

What if there is an in-service tank already on the property, should I still do a tank search?

EcoTech highly recommends doing a tank search to rule out any additional tanks that may or may not be on the property. On average our tank searches cost $99.00, during the inspection period this is money well invested. Not only does a tank search give you peace of mind that there are no additional tanks on the property. It can also save you from years of worry or money spent if there is indeed an additional leaking tank on the property, which you now own and are responsible for cleaning up.

 

Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning Common Questions

 

What does it mean to decommission a UST?

The most generic term, is to take the tank out of service.  Underground Storage Tank or UST decommissioning is accomplished by ensuring the tank has been properly cleaned and removed or completely filled with an inert material. The inert material consists either of perlite, a sand-like material or slurry, concrete.

If the tank is to be registered with DEQ, two soil samples will be taken from inside the bottom of the tank, after being pumped and cleaned, and analyzed for diesel and heavy oil. Each sample needs to be analyzed at an independent laboratory that is DEQ certified.

If the samples come back as non-detected, the tank can be then registered with the DEQ.

If the samples come back above the DEQ reporting limit (50.1 PPM), remediation will need to take place and once the corrective action has been completed, the tank will be registered with DEQ.  If soil remediation is need, please see our Decommissioning via Heating Oil Contaminated Soil Clean-Up page.

Why should homeowners decommission their UST and register it with the DEQ

I’ve emptied my tank of oil years ago and don’t use it any more, doesn’t that mean it is decommissioned?

No, in order to decommission the tank you will need to take the tank permanently out of service. This is completed by either removing the tank or filling it in place with an inert material.

Can I decommission my own UST?

According to the DEQ, it is legal for a homeowner to decommission their own UST, assuming that you perform the work yourself and comply with all applicable local, state and federal rules. Before deciding to decommission your own tank, the DEQ highly recommends that you read the DEQ Cleanup Guidance for Homeowners to understand the full scope of work involved in completing a decommissioning project. DEQ Decommissioning Guide for Homeowners

I’m selling my home and have switched over to gas years ago, should I decommission my tank?

It is not a requirement to decommission your tank before selling your home. Unfortunately in this highly active real estate market, many buyers will require at a minimum, proof of recent clean soil samples. Additionally, you will need to provide the buyer with documentation that the tank has been pumped of all of its contents. The documentation that the DEQ requires is dated receipts from the company that pumped the oil out of the tank; or receipts from the oil recycling company, if you pumped the tank yourself.

Do I have to decommission my UST?

No, it is not a requirement to decommission your tank once you stop using it.  However, if you are thinking about selling your home, most buyers and their agents request decommissioning and registration before closing. Per DEQ, you will need to ensure that the tank has been emptied of oil and you will need to provide that documentation to the new buyer.  DEQ Requirements for Tanks No Longer in Use

Do I have to register my UST?

It is not required by DEQ to register the tank, but it is highly recommended. However, if you are decommissioning the tank as part of the sale of the home, this is usually a prerequisite prior to closing.

Why should I register my UST?

There are three primary benefits of registering the UST decommissioning with the DEQ:

  1. The decommissioning becomes public record.  So, even if your copy of the paperwork is misplaced or the name of the contractor that performed the work is forgotten, the record remains in the DEQ files.
  2. When the DEQ changes any of their rules (i.e. reporting limits, remediation guidelines, etc.), previously closed or registered tanks are “grandfathered” in.  Tanks that were decommissioned and not registered are subject to the new rules.  For example, over time the DEQ required the locations of soil sampling to change.  Meaning a previously unregistered decommissioned tank, would need to obtain additional soil samples to bring the tank up to the new DEQ sampling requirements.
  3. Most buyers are requiring DEQ registration because they don’t want to deal with future DEQ rule changes.  Even if you don’t plan to sell the property any time soon, registering the tank now can prevent added costs prior to and during a future sale.

I have a tank that was decommissioned years ago, but never registered with the DEQ, how do I now get it registered?

In order to establish if the tank has been decommissioned properly, soil samples and a tank inspection would be required. Soil samples need to be taken in order to determine if the tank had leaked prior to decommissioning. A tank inspection is necessary to establish if the tank has been decommissioned properly.

If the soil samples are clean and the tank has been decommissioned properly, the tank then can be registered with the DEQ.

USTs that have been Decommissioned inproperly

What happens if it isn’t decommissioned properly?

There could be a couple of different reasons a tank has not been decommissioned properly.  There may be inadequate or contaminated fill material, water within the tank or simply something that shouldn’t be in the tank (i.e. paint cans, large rocks, etc.).  Besides what is inside the tank, the soil samples will need to be taken into consideration to allow the tank to be certified as decommissioned to register with the DEQ.

  • Fill Material:  If the fill material within the tank is not an approved by the DEQ, that material will need to be removed and the tank will be re-decommissioned to DEQ standards for certification.  The same reasoning will go with contaminated fill material, even if it is DEQ approved material.  The contaminated material will need to be removed and the tank will need to be re-decommissioned to DEQ standards for certification.
  • Water:  If there is water within the tank, all water will be pumped out of the tank and re-decommissioned in order to certify with the DEQ.
  • Unconventional Items:  From time to time, items are found within a tank that should NOT be there.  Items such as large boulders, paint cans, trash cans and even tires have been discovered within a tank.  If this situation does arise, all items will need to be removed and disposed of in a landfill and the tank will need to be decommissioned.
Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning – Concrete, pain cans and water found within a tank.

What exactly do you do to decommission a tank?

In order to decommission an underground storage tank, we need to follow some step-by-step processes to ensure that we are able to take soil samples and inspect the tank properly.  This is the process by which EcoTech begins each in-place underground storage tank decommissioning project:

1.  We dig down, expose the tank and cut it open.

Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning – Exposed tank top.

2.  All tank contents are removed; heating oil, residual liquids, sludge.

3.  Clean and dry the tank interior and inspect it for holes.

Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning – Holes from within a tank.

4.  Collect soil samples from the inside and through the bottom of the tank.

Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning – The technicians cut two holes in the bottom of the tank to expose the soil underneath, two samples are then “grabbed” underneath the tank bottom.

5.  Soil Samples are submitted to the lab the same day for analysis, with results typically back the next business day by noon.

6.  Pending favorable laboratory results (less than 50 PPM), the tank can be backfilled with perlite or slurry.

***If soil sample results come in above the 50 PPM, remediation would be required to bring the site up to DEQ requirements.  (Please see our Heating Oil Contaminated Soil Clean-Up section for additional information on remediation Clean-Up with Decommissioning).

Underground Storage Tank or UST Decommissioning

Underground Storage Tank or UST Decommissioning – Tank filled with slurry.

7.  After the tank has been filled, the tank is then covered back over with the previous landscape (i.e. grass, concrete, dirt, etc.).