Blog

July 19, 2018

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....

July 19, 2018

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...

April 13, 2016

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...

February 18, 2016

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...

February 16, 2016

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...

February 1, 2016

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.

March 2, 2015

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...

February 18, 2015

We are proud to announce that Enviroprobe Service, Inc. will be a sponsor of 3rd Annual Southwest Florida Brownfield Symposium. As a company providing drilling and geophysical services for more than 20 years, being a sponsor of the symposium is our continuing effect to support environmental communities.

The symposium is to be held on March 20, 2015 in Fort Myers, FL. Its goal is to assist you in putting your Brownfield puzzle together as you thrive towards economic enrichment through redevelopment. There will be a diverse group of volunteer speakers with a wide range of...

February 15, 2015

Ground penetrating radar (GPR) has many applications. One of its applications in engineering is to delineate lateral extents of footings for bridges, buildings and other structures. Design and as-built plans are not always available when needed and a GPR survey could provide valuable information about the footings in a non-destructive and efficient way.

The GPR profile below shows a concrete footing with reinforcement. The top of the footing was about 3' underneath a concrete floor. The GPR profile was collected next to a steel supporting structure.

February 13, 2015

"The ground is snow covered, is it OK for the GPR survey?" This is a very common question from our clients. Ground penetrating radar (GPR) actually works well through snow or ice. Below is a GPR profile showing an underground storage tank (UST) with ground covered by about 4 to 6" of snow. The located UST was marked on-site as in the picture to the right.

Although snow or ice on the ground surface wouldn't block GPR signals, it's not a favorable working condition for some types of GPR surveys, such as those searching for underground utilities. A GPR designed for undergro...

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