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.

 

UST Tank Search for Sellers

UST Tank Search for Sellers – Common Questions

As a homeowner, you may be thinking about or are preparing to put your home up for sale. For some homeowners, you may want to perform a tank search to prepare yourself for any unforeseen surprises during the home inspection period. On the other hand, you may know that there is a tank on your property that was decommissioned and never registered with the DEQ or that there is an abandoned oil tank, but you don’t know where. These are some of the most common questions that we are asked regarding the tank inspection process and important information you should know before you sell.

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 Sellers

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

Why should I worry about an 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 Sellers

UST Tank Search for Sellers – Shot from interior of tank, many small holes in the UST, which will cause 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. As the homeowner, you may also look for these tell-tale signs of an abandoned oil tank:

  • An Oil Fill Pipe, these are usually close to the ground and near where the furnace is located in your home.  The lid itself will usually indicate OIL in the center of the cap.
UST Tank Search for Sellers

UST Tank Search for Sellers – Fill pipes can appear in multiple places within a property, in a walkway, grass, driveway, and even under a deck are a few examples.

  • A Vent Pipe, this is usually attached to the home, about two to eight feet up the side of the house and it is 1.25 to 1.5 inches in diameter with a small vent cap on it.

 

UST Tank Search for Sellers

UST Tank Search for Sellers – 4 different types of vents and their locations.  Fill vents can come in different sizes, colors, and may be placed at varying sections of the home.

  • Product lines, may be found sticking out of the ground in the yard, in a crawlspace or basement floor.  Product lines may still be attached to a basement or crawlspace wall next to water or gas pipes.
UST Tank Search for Sellers

UST Tank Search for Sellers – Crimped product lines may appear as random pipes sticking out of a basement floor or out of the dirt near the home in the yard. A product line may also appear running up a wall in a basement or crawlspace, like the far right picture (the thin line on the right)

  • Patching, will be present on a basement floor, it appears as though a pipe has been removed and covered with concrete.  The patching may appear as a bad “patch job” with numerous bumps and grooves.
UST Tank Search for Sellers

UST Tank Search for Sellers – Patching on a basement floor.

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 Sellers

UST Tank Search for Sellers – Terra finds a tank within a planter.

UST Tank Search for Sellers

UST Tank Search for Sellers – The tank that Terra found is marked out. The purple arrow indicates where the vent pipe has been removed from the siding. The red arrows indicate the length of the tank, marked with orange flags as well as the tip of the measuring tape.

 

UST Soil Sampling

UST Soil Sampling Common Questions

Whether a tank search has resulted in a UST being discovered or if there is an in-service tank on the property, EcoTech highly recommends soil sampling be completed around the tank.

If you are a buyer, it is imperative for you to obtain soil samples on the underground storage tank, as once you purchase the property, you have now purchased the UST and if it is leaking, are now responsible for the clean-up.

If you are a seller or a homeowner thinking about selling, and you know you have an UST on your property, preemptive soil samples will allow you prepare for pre-inspection complications.

For more information on underground storage tanks and real estate transactions, please see the DEQ Buying or Selling guide for helpful tips DEQs Buying or Selling a Home with a UST

What if a UST is found?

Soil Samples are recommended. Per Oregon DEQ, the best way to determine if a UST has leaked, is to have soil samples collected from under each end of the tank and have the samples analyzed for diesel and heavy oil. Each sample should be analyzed at an independent laboratory that is DEQ certified.

UST Soil Sampling

UST Soil Sampling – Rendition of technician taking soil samples 12-24″ beneath an underground storage tank.

UST Soil Sampling

UST Soil Sampling – Sampling tubes filled with soil from around an underground storage tank. The soil is then placed in a jar and sent to the lab for testing.

There is an in-service tank, should I perform soil samples?

As a prospective buyer, it is essential to test a tank before purchasing the property to determine if it has leaked or is currently leaking. The current property owner is responsible for any necessary contamination clean-up from a leaking underground storage tank. Purchasing a property without testing a tank makes you, as the new property owner, liable for a prior or currently leaking UST.

I’m selling my home and the buyer has found a tank, what are the next steps for me?

EcoTech recommends that you decommission the tank and register it with DEQ. Although, through our experience, buyers and their agents will require at a minimum proof of clean soil samples.

Types of Soil Samples

What are the type of UST soil samples? 

There are three different categories that sample results can be placed into:

Non-Detect (ND)

In-service tank: samples that were analyzed have come back as non-detect and no further tests are necessary. EcoTech does recommend that the decades old tank be decommissioned and a new heat source chosen, as soon as it is practical, before the tank does leak.

Out-of-service tanks: samples that were analyzed have come back as non-detect and no further tests are necessary. EcoTech does recommend that the out-of-service tank be decommissioned within 90 days of the soil samples and registered with DEQ.

*For both the in-service and out-of-service non-detect samples that were taken from each end of the UST, does not rule out the possibility of contamination underneath the soils of the tank, that is why EcoTech recommends decommissioning of the UST.*

50 PPM (parts per million) or less

In-service tank: samples that were analyzed indicate that a leak is present. Although this is a low detection and it is not reportable to DEQ, it indicates a leak has started and should be a concern. EcoTech highly recommends that the tank be taken out-of-service and decommissioned and registered with the DEQ.

Out-of-service tank: samples that were analyzed indicate that a leak is present. Although this is a low detection and it is not reportable to DEQ, it indicates a leak has started and should be a concern. EcoTech recommends that the out-of-service tank be decommissioned and registered with DEQ.

50.1 PPM or Greater

In-service or out-of-service tanks: “The OR DEQ requires that any site where a soil sample analysis shows petroleum concentrations of 50 PPM or greater, must be reported to the DEQ within 72 hours. Remediation will be determined based on the extent of the contamination.” Simply put, the tank is leaking above the reporting limit, EcoTech is required to report the leak to the DEQ, corrective action is now needed to clean-up the site.