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Gravity or micro-gravity surveys consist in measuring the relative changes in gravity from one place to another. Sharp relative changes in micro-gravity usually evidence drastic changes in the subsurface density of the underground material.

This method allows us to identify the geological scenario for sinkholes with the potential of damaging existing structures earlier in their development without more expensive and invasive techniques.

Results of one such survey are illustrated in the image to the left. The low micro-gravity anomaly (indicated in purple) help narrow down...

We are proud and excited to

share our recently acquired Geoprobe 8140LS Sonic Drill Rig with our clients. The 8140 replaces our previous sonic rig with the intentions of still reaching the same desired drilling targets, but at a more affordable cost. The main idea in the decision to go with the Geoprobe Sonic Rig was to be able to mobilize and demobilize the machine ourselves. Often the hefty cost of having a low boy truck hauling our previous machine was too costly a price for our clients to work into their projects. The new machine is hauled by our drillers in house an...

Enviroprobe utilizes high frequency antennas for concrete scanning to protect our customers and their infrastructure during coring and cutting activities. Based in New Jersey  and Southern Florida, we routinely cover the entire east coast as well as traveling nationwide when needed.

Client's often think the utility risk is limited to exterior areas and find out the hard way this is entirely untrue. This particular transect was collected in a residential tower in Philadelphia last week. It clearly depicts a re-bar grid (at approximately 1.5" - 2'') and a diagonal a...

Due to complexity and often 3D natures of subsurface conditions, 2-dimensional direct current electrical resistivity surveys (resistivity profiling) often can not provide the best results and the data interpretation is difficult. In the other hand, a 3D resistivity survey provides a much better prospective and the results more accurately reflect the subsurface conditions. 

Enviroprobe recently conducted a 3D resistivity survey in northwest New Jersey to identify potential sinkholes for a residential property. There had been sinkhole openings in and around the properties....

In 2015, Enviroprobe conducted an electrical resistivity imaging (ERI) survey to locate underground caves in Bermuda. Along with the beauty and myth of Bermuda came one of the most difficult surveys. The majority of the survey areas were in jungles with tough terrains. Paths had to be cleared for the survey lines and they were kept narrow to minimize the impact to vegetation. In humid weather, carrying heavy equipment while watching your footing was a challenge to the survey crew, both physically and mentally.

Despite the difficult survey conditions, Enviroprobe's survey...

As part of a project for tracking down overflowed oil, Enviroprobe conducted a geophysical survey to delineate the bedrock topography around a tank field. The seismic refraction was the primary investigation method and an EM31 survey was also conducted as a quick complementary method.

The 2D seismic refraction survey was conducted along parallel lines and the results were interpolated for the bedrock topography. One of the important discoveries was that the elevations of the bedrock top around perimeters of the tank field were low, although the tank field itself appeared...

An out-of-state environmental consulting company contacted Enviroprobe for a project in New Jersey. The property currently was a hotel. Records show that the property was once a gas station with underground storage tanks. The old site plan showed the approximate location of a former UST which supposedly had been removed. However, the plan was not scaled and out of proportion, creating difficulty for selecting soil boring locations. Enviroprobe performed the ground penetrating radar investigation and delineated the former UST excavation area. The results were provided in...

In the Fall of 2015, a geophysical survey crew from Enviroprobe Service Inc. was mobilized to Upstate New York to perform a geophysical investigation using the marine electrical resistivity imaging (ERI) method. The purpose of the investigation was to investigate the sub-bottom materials in a river, specifically the thickness of the soft layer at the river bottom underlying by hard glacial till or bedrock. This soft layer was mostly clay or silt. The target survey area was about 5 miles long. 

The area had been investigated using other geophysical methods including GPR a...

Although a video camera can usually be sufficiently enough to find the bottom of the casing for a well, sometimes the video camera doesn't work due to corrosion and deposits on the walls of the hole. In such cases, geophysical logging tools such as the caliper could be very useful.

Enviroprobe conducted an investigation in a well using both video camera and geophysical borehole logging. The casing bottom was not clearly visible in the video but its depth can be discerned from the caliper log as shown in the image.

It's a very common practice for environmental consultants to get soil samples around underground storage tanks (USTs). The selection of drilling locations depends on a lot of factors and sometimes it's preferable that they are located as close as possible to USTs without risking damaging them. Ground penetrating radar (GPR) is a great tool to use to delineate UST scopes due to its very high lateral resolutions.

GPR can be used to delineate scopes of USTs made of steel or fiberglass. Even if a concrete slab is constructed on the ground surface for the protection of UST, i...