Soil and Groundwater Cleanup/Remediation

OilTankAssurance expert soil remediation services for leaking oil tanks offers ‘NOT TO EXCEED’ PRICING on all its remediations.

Not to Exceed Pricing versus Flat Rate
Any contractor that gives you a proposal without any kind of delineation (see below), is giving you a proposal to get their foot in the door. Without a delineation, nobody can give you an accurate proposal so you know the limits on what you could spend.

Our commitment to you:

When you contract with, we will give you a proposal for our Rock Bottom pricing to complete a delineation. This proposal will be a basic delineation whereby we can let you know the outer limits of the work required. We will complete this work for you and provide a detailed report. If you agree to choose us to complete the remediation, we will apply 40% of the delineation cost towards the remediation.

We will also, guarantee that our proposal will not exceed the bottom line price.

FRAUD ALERT!  Did your contractor who removed the oil tank take a preliminary sample? if they did not and gave you a proposal for removal of soils, this is the first sign you need to speak to other contractors! Don’t fall for “the soil stinks, the soil is very high on the PID meter.”


Oil Tank Assurance will complete a delineation of your property. We will utilize a geoprobe and/or hand held probing equipment.

Utilizing probing equipment, we will define the extent of the soil and or ground water contamination or plume coming from a leaking oil tank or spill.

The purpose is to have a model that:

  • Offers boundaries or extent of impacted soils.
  • Is both lateral and horizontal.
  • Laterally is the depth or how deep did it go.
  • Horizontally is how far did it go.
  • Can tell us where soils are impacted but, under criteria and can be left in ground.
  • Will create a very strong baseline so our field equipment (PID meter) can be more precise and limit soils that typically get removed creating unwanted expense.

Oil Tank Assurance will complete a delineation of your property. We will utilize a geoprobe and or hand held probing equipment.

Soil testing and remediation
This picture shows the original sample taken when the tank was removed. The sample is over 5,100 ppm for Extractable Petroleum Hydrocarbons and requires soil remediation.

We would now have a correlation with our PID Meter when in the field and would know about what the samples will come back at under EPH when we send to the laboratory. All sample results below are what came back from the laboratory.

NJDEP Licensed sub surface evaluator (SSE) using a meter on some samples and samples being non detect.

Soil testing and remediation by Oil Tank Assurance

First round of borings would be in green, sample N-1, (north 1 eg.) is non detect, clean. The south and East samples are still very high. They are impacted from 6 feet to 11 feet in depth.

Soil testing and remediation services in Northeast New Jersey Oil Tank Assurance

We continue sampling west, south and east. We know north is clean. We-2 is well under. We now know soil cleans up between W-1 and W-2. S-2 and S-7 are still over cleanup criteria but only dirty between 8 feet and 11 feet. Only 3 feet here will be disposed of. E-3 is well under, we now know our boundary for the East.

Soil and groundwater testing and remediation by Oil Tank Assurance

Knowing the two of the last phase are still over (marked in red). We now do the blue sampling.

S-6 and S-7 are well under the criteria. S-4 is barely over. We would need to excavate past and get the PID Meter reading in the field while excavating now about 25% under the reading to assure that we are over. S-5 is just on the border line, while under, we would make sure also that we excavate and get the PID Meter reading about 20% under the last field reading.

Soil remediation meter reading Oil Tank Assurance

Soil Testing and Remediation Oil Tank Assurance Northeast New Jersey
This shows the approximate limits of soil removal. some area we are taking 6 feet off (overburden), and some areas are taking 9 feet off and reusing that. No disposal costs!

Sample map of soil remediation process Oil Tank Assurance

A photoionization detector or PID is a type of gas detector.

Typical photoionization detectors measure volatile organic compounds and other gases in concentrations from sub parts per billion to 10,000 parts per million (ppm). The photoionization detector is an efficient and inexpensive detector for many gas and vapors.

Very important to read this about PID meter and soil sampling!

PID readings and ppm results on a meter cannot close out a case NJDEP does not accept, they are for guidance only.
Having a correlation or base line to the readings of your soil compared to the results from a laboratory is very important to save unwanted soils from being removed or expensive remobilizations due to leaving soils that are still over the criteria.

Back in the late 90’s the NJDEP required samples to be TPHC (Total petroleum hydro carbons). Back then when a PID meter read for example:

• 500 ppm and the TPHC samples went to the lab so you could bet they were between 10,000 and 11,000 ppm.

• If the PID meter reads 250, you could bet they went to the lab and were 5,000 to 6,000 ppm.

The NJDEP has changed procedures twice now, from using TPHC to DRO to now, Extractable Petroleum Hydrocarbons E P H. because the test involves looking at a range of components and not just vapor or volatiles. The correlation no longer applies.

Now, a PID reading at one property could read:

500 ppm on PID meter, and after the laboratory and run for Extractable Petroleum Hydrocarbons, the results could be 2,000 ppm. This is good and can close out a case without removal.

Yet the day at a property 3 miles away, the 500 ppm reading on the PID could be 15,000 ppm on Extractable Petroleum Hydrocarbons requiring soil removal.

This is why preliminary soil samples are so important.