Knox 5-Point Tank Sweep

The EPA estimates that up to 100,000 abandoned and undiscovered underground oil tanks (UST’s) exist in New Jersey. Many of these tanks were not properly decommissioned and may had been leaking before or after they were abandoned for another tank or fuel source. Underground oil tanks are made of steel and when water enters the tank it slowly erodes small holes in the bottom, allowing fuel oil to gradually seep into the ground.

A home buyer assumes all the liability when purchasing a home with a tank present. The cost of required soil remediation can be anywhere from $10,000 to over $100,000 and many homeowner insurance policies therefore specifically exclude this contamination.

If the home is over 20 years old or previously had on older house on the property, we strongly recommend a tank sweep is performed. Discovery of an oil tank can cost more than almost any other item found on a home inspection. In fact, many investors who buy homes frequently will waive the home inspection but still perform a tank sweep.

5-Point Tank Sweep Process:

1. Visual Inspection

The inspector will check the basement or crawlspace of the property for evidence of current or previous fuel oil use for heating. The foundation walls near the boiler or furnace will be searched for evidence of copper fuel oil line straps, buried copper fuel oil lines in the slab, and foundation penetrations or patches of one or two fuel oil lines. The inspector will then check the exterior perimeter of the home for any fuel oil fill ports or vent pipes. Areas of dead grass or dirt where grass will not grow are also identified.

2. Electromagnetic Locating (EM Locating)

If any interior line sets are discovered penetrating the foundation or any suspected underground oil tank fill/vent pipes are present on the exterior, the inspector will use an electromagnetic locator to energize the lines and confirm if an underground oil tank is present.

3. Exterior Sweep with Magnetometer

The exterior ground surfaces at least 30′ from the home foundation and any other foundations on the lot are then swept with a deep penetrating magnetometer to identify large ferrous anomalies consistent in size, shape, and location of an underground oil tank.

4. Ground Penetrating Radar Scan (GPR)

While many oil tank sweeps only require use of a magnetometer, some properties have large areas that can only be scanned by a ground penetrating radar (GPR). GPR’s use a radar to scan the soil non-invasively. All properties are first scanned with a magnetometer and if additional GPR scanning is needed the inspector will GPR scan the area of concern for no additional charge!

5. Written Report

A written report will be issued by email the same day to describe our findings including any pictures or data.

5-Point Tank Sweep w/ GPR Pricing

  • Stand Alone Tank Sweep with GPR
  • When Bundled with Home Inspection or Sewer Scope

Please call, text, or email for stand-alone tank sweep – online scheduling not available.

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