GPRS Enterprises Inc. Canada Canada Concrete Scanning Utility

Frequently Asked Questions

GPRS Enterprises Inc. FAQs:

What type of training do your technicians receive?
Each of our technicians goes through two month training process. This includes two weeks of training at our corporate offices in our world class training center. The GPRS Enterprises Inc. training center has test slabs of concrete with every type of slab we encounter in the field. Here they are instructed by our Director of Training who has 9 years (over 2,250 jobs) of field experience. We also pair each trainee with an experienced technician until the trainee has demonstrated the consistent ability to work on a comparable level to an experienced technician providing technical expertise and the ability to get through difficult Ground Penetrating Radar applications.

How quickly can you respond to an emergency need?
In most circumstances, we can have a technician on your site within 24 hours.

Is GPRS Enterprises Inc. available to work at night or on the weekend?
We, at GPRS Enterprises Inc., pride ourselves on customer service and our ability to meet your scheduling needs. We are willing to work nights and weekends in order to help you accomplish the goals of your project. Please contact your local GPRS Enterprises Inc. representative for rates and schedule availability.

How deep can your Ground Penetrating Radar “see”?
This answer depends on the type of application in which you are interested. For concrete applications we can typically penetrate to a depth of 18-24”. We use a 1500/1600MHz antenna for concrete scanning applications. For private utility locating needs on grass, asphalt or concrete we can generally penetrate anywhere from 3-7’(note: this is as per our proposals and terms/conditions). For these types of applications we use a 400MHz antenna. When locating private utilities we have found that our depth penetration is limited by the soil conditions and composition presented at the project. While we have noted a standard depth range of 3-7’ there are scanning conditions that allow for greater depth penetration. Because GPRS Enterprises Inc. is committed to providing the most accurate and comprehensive GPR surveying services, we also have the ability to use larger antennas for greater depth penetration. Please contact your local GPRS Enterprises Inc. representative for more information.

Does GPRS Enterprises Inc. buy used equipment?
Yes, we buy used equipment from other GPR companies. Contact us today as we would be happy to see the equipment and negotiate a deal. Please call our corporate office at (419) 843-9804.

Why should I choose GPRS Enterprises Inc?
GPRS Enterprises Inc. is dedicated to subsurface locating both for private utility projects and concrete scanning. Locating is the only service that we specialize in, and we believe that allows us to be the best. We have found one key difference between us and our competitors is the total area we are able to scan in a given amount of time. Most companies we compete against are not able to cover the square footage or miles in the same amount of time. We also save your time by putting you directly in contact with the local technician in your area. This saves time by allowing our technicians to ask pointed questions regarding your project and enables them to determine the scope of efficiencies.

What is the maximum distance your technicians will travel?
GPRS provides nationwide ground penetrating radar services with offices in every major city from coast to coast and Canada

 

Concrete Scanning FAQs

How much do Ground Penetrating Radar services cost?
GPRS Enterprises Inc. offers concrete scanning and private utility locating services for clients as a better option than buying equipment and training employees.

When you hire GPRS Enterprises Inc. , you can save your company upfront equipment cost and long term cost including headaches and problems of training a GPR user. GPRS Enterprises Inc. owns the best equipment on the market, investing hundreds of thousands of dollars into equipment and the training.

GPRS Enterprises Inc. technicians are extensively trained and are backed by a Ground Penetrating Radar company that has done over 25,000 jobs. Our technicians see data from an average of over 200 jobs a year, so they understand how to interpret data from all types of project sites. It is easy to miss critical information in the data if an operator is not familiar with the data and what it means.

When you hire GPRS Enterprises Inc. you receive a cost savings and the benefit of our expertise. We have a network of over 100 active full-time field technicians nationwide who perform jobs just like yours every day.

How accurate are the results when using ground penetrating radar?
Extremely accurate! Again, our accuracy is dependent upon the type of application in which you are interested. We have found that when scanning with the 1500/1600 MHz antenna (most concrete applications) we are +/- ¼” to the center of the object we are locating and ½” +/- to the actual depth. We have found that when surveying with the 400 MHz antenna (most private utility locating applications) we are +/- 6” to the center of the object we are locating and +/- 10% to the actual depth. Soil moisture conditions and other factors affect the accuracy for the 400 MHz antenna, and these accuracy results are based on over 50+ years of GPR experience.

Can GPR scan vertical or overhead surfaces, such as ceilings or walls?
Yes. We regularly use our equipment to scan for the location of rebar in concrete columns and walls. On occasion we are also asked to scan from the underside of a floor to mark out the reinforcing steel and any embedded conduits. This is most common when a customer wants to set anchors into a floor for large piping.

In a post-tensioned slab, how are is GPR able to differentiate the tendons from the rebar?
While differentiating between post tension cables and typical metal reinforcing bars (rebar) is difficult, the technicians at GPRS are specifically trained in determining the difference. GPRS Enterprises Inc. is able to provide our professional opinions based on the spacing and elevation of the embedded reinforcing steel (both rebar and post tension cables) in the concrete. For example, in post-tensioned structures, we typically find one mat of support bar near the base of the elevated slab. This mat of support is consistently spaced and remains at a constant elevation; we usually find them above the mat of support bar, and they usually are "draped" through the slab.

Further, the elevation of the cable is usually high near the beams and column lines and drapes lower through the span between beam and column lines. Our technician’s will provide accurate survey findings for contractors to drill or cut without concern for hitting post-tensioned cables.

Can GPR determine the difference between rebar and electrical conduit?
Although it is true that rebar and electrical conduits produce similar reactions on the data screen, in most cases, yes, we can determine the difference. We are able to differentiate between the two objects/anomalies by determining the rebar pattern (spacing and elevation). If the pattern is broken, in all likelihood, the rupture is from the presence of a conduit. We have an extremely high success rate in applications in which we are asked to find electrical conduits in supported slabs or in slabs-on-grade prior to saw cutting or core drilling.

Additionally, GPRS Enterprises Inc. has the capability of using electro-magnetic induction to determine the location of conduits in the concrete. If we are able to “induce” a tone onto the metal conduit we can locate it with pinpoint accuracy. We can also locate the conduit if it has “live” electrical current or telecommunications running within it.

With both GPR and EM Induction we provide one of the most comprehensive and accurate conduit locating services available.

 

Utility Locating FAQs

Can GPRS Enterprises Inc. determine what type of utility it is?
No, we cannot. We can generally find the utility without much difficulty, but we cannot determine if the piping is gas, or water, etc. We can often trace the utility to a valve, meter, control box, or other type of signifying marker, thereby determining the utility. Additionally, we have the ability to provide the elevation of the utility and can cross reference it with as-build plans to confirm the plans are without error.

How accurate are the results when using ground penetrating radar?
Extremely accurate! Again, our accuracy is dependent upon the type of application in which you are interested. We have found that when scanning with the 1500/1600 MHz antenna (most concrete applications) we are +/- ¼” to the center of the object we are locating and ½” +/- to the actual depth. We have found that when surveying with the 400 MHz antenna (most private utility locating applications) we are +/- 6” to the center of the object we are locating and +/- 10% to the actual depth. Soil moisture conditions and other factors affect the accuracy for the 400 MHz antenna, and these accuracy results are based on over 50+ years of GPR experience.

What type of “output” or reporting do you provide for mapping utilities?
Our typical survey output is to simply paint and pin flag our findings directly on the surface. For most applications this is sufficient as the excavation/digging will commence within a few days of our service. However, for some this may not be enough. GPRS now has the capability to provide you with a GPS map of your utilities. We can output our GPR survey results directly into a Google Earth image or provide you with a CAD file overlay. Please contact us to discuss pricing and mapping options that your project may need.

Can GPRS Enterprises Inc. tell me the size of a void cavity below ground?
GPRS Enterprises Inc. can identify the area where the void is occurring and clearly identify its boundaries. GPRS Enterprises Inc. cannot, however, determine the depth from the top of the void to the bottom of the void.

Can GPR locate unmarked grave sites?
Yes, Ground Penetrating Radar can be used to determine the location of unmarked graves for site planning purposes. While older grave sites can be harder to locate because of material deterioration, in most cases we can accurately map where these grave sites are found.

 

 


Associations GPRS Enterprises
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Ground Radar Scanning in Canada
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