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 We
understand that you may have a few questions, so we've tried to answer
the most common ones right here. If there's anything that you're unsure
of after browsing this page, be sure to contact
us so we can answer all of your questions.
What is Direct Push (DP) Technology?
Direct Push machines "push" tools and sensors into the ground
without the use of drilling to remove soil to make a path for the tool.
A Geoprobe® brand direct push machine relies on a relatively small
amount of static (vehicle) weight combined with percussion as the energy
for advancement of a tool string. Probing tools do not remove cuttings
from the probe hole but depend on compression of soil or rearrangement
of soil particles to permit advancement of the tool string.
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What are some of the benefits in using a Geoprobe® machine and tools over hollow stem auger methods and tools?
· Streamline subsurface investigations
· Need for fewer permanent monitor wells
· Provide quick, multiple media and multiple depth sampling
· Lessen investigation derived waste (IDW) disposal headaches
· Acquire in situ chemical and physical data
· Use of less visually obtrusive equipment
· Minimal physical and chemical disturbance of the sample media
· High degree of sample integrity
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How deep can I sample using a Geoprobe® machine and tools?
Soil conditions determine sampling depths for Geoprobe® machines, but typically they can collect samples from depths less than 50 feet, but some of our customers regularly sample to depths of 100 feet, and a few have sampled to nearly 200 feet. Direct Push (DP) applications are most applicable in unconsolidated sediments. Penetration is limited in semiconsolidated sediments and is generally not possible in consolidated formations. DP equipment may also be limited in unconsolidated sediments with high percentages of cobbles and boulders or soils high very high density (i.e., hard soil).
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I often use a small inverter to power 110-Volt accessories from the 12VDC port of my 2002 Geoprobeâ Model 54DT machine. This same setup does not work with our 2004 machine. What’s the deal?
The wiring configuration of 12VDC outlet receptacles was changed
on Geoprobe® direct push machines beginning November 1, 2003. This
change was made to conform to industry standards and allows connection
of aftermarket accessories without concern of equipment damage. [Read full details: 12VDC Adapters List.pdf) View other Service & Maintenance Tips...
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I am sampling in
a swelling clay with your Macro-Core® Sampler and I am having trouble
with stuck liners. What can I do to help with this?
The undersized cutting shoe for the Macro-Core® Sampler takes a 0.125
in. smaller OD core, which allows room for the material to expand. Use
a heavy duty liner which are harder for the soil to expand causing them
to stick inside the MC sample tube. For the easiest solution, use our Hydraulic
Liner Extruder.
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What MC sampler tube lengths are available?
60 in. MC Sample Tube (4899)
48 in. Sample Tube (AT8522)
36 in. Sample Tube (AT8320)
24 in. Sample Tube (AT8220)
1m Sample Tube (AT8420)
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What are discrete
and non-discrete soil samplers?
A discrete soil sampler is a closed sampling tool used to collect a soil
sample from a prescribed or distinct interval. The inside of the sampler
is not exposed and has minimal exposure to the subsurface environment
until the sampler reaches the prescribed depth. These samplers are sometimes
called closed or closed tube samplers.
A non-discrete soil sampler is an open sampling
tool used to collect samples continuously. The inside of the sampler is
exposed to the subsurface environment while it is advanced to the sample
interval. These samplers are sometimes referred to as open or open tube
or continuous samplers. Read more about our soil samplers...
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What is dual tube
soil sampling?
Dual tube sampling gets it name from the fact that two sets of rods are
used to collect soil cores. The outer rods receive the driving force from
the Geoprobe® machine and provide a sealed hole from which soil samples
may be recovered without the threat of cross contamination or cave-in.
The second set of rods are placed in the outer rods and hold a sampler
in place as the outer rod is driven the sample interval. The inner rods
are then retracted to retrieve the soil core.
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What are groundwater
grab samplers?
Grab samplers are usually installed on a temporary basis to collect groundwater
samples, hydrogeologic data, and then removed from the subsurface. The
samplers are installed, a sample is collected, hydrogeologic tests may
be completed, and then the sampler is removed. Two types of grab samplers
are commonly used with DP machines, non-discrete or unprotected screen,
and discrete or protected screen.
Because the sampling section of the non-discrete
groundwater sampler is not protected or sealed, this sampler should only
be used where cross contamination from overlying materials is not a concern.
Discrete groundwater samplers are driven
to the sample interval, then o-rings, a protective tube/sheath, and an
expendable point provide a water-tight seal.
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What is in situ
and ex situ analysis?
In situ analysis makes use of technologies or methodologies that do not
require collection of samples. The instrument is brought into contact
with the media to be sampled in place; without removal of the medium and
placement in containers. Ex situ analysis makes use of technologies or
methodologies that require some type of physical collection of samples,
the sample must be taken to the instrument for analysis.
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Can Geoprobe® tools
be used for groundwater characterization?
Absolutely! During subsurface investigations you will probably collect
groundwater for chemical analysis, determine some basic hydrogeologic
parameters (hydraulic
conductivity, permeability, etc.) and/or take static water levels.
This is usually referred to as characterizing the groundwater. The type
of Geoprobe® groundwater
sampler will vary from temporary installation to collect grab samples
to monitoring
wells designed for permanent installation and long-term monitoring.
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What type of sand
is used in Geoprobe® Prepacks and well installations?
We use a 20/40 mesh environmental silica sand.
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Do I have other
screen options for the SP15 water sampler?
Yes, we have three options for the SP15:
-- GW1520 stainless steel wire wound screen
-- GW1530 PVC 10 slot screen
-- 16089 PVC expendable 10 slot screen
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How soon do I need to get an order in for it to make it out that same day?
The earlier the better. Orders received by 4 p.m. Central Time are usually sent out the same day if stock permits. For large quantities of one item, it's best to call ahead of time to make sure our inventory can accommodate your needs.
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I don't have a account with Geoprobe® Systems....can I still place an order today?
We accept most major credit cards or will send your order COD, usually the same day the order is placed. Mailing or faxing us a copy of your company letterhead with the proper billing and shipping information speeds up the process. It's also best to have a contact name at your company who wants to receive tooling and price updates. Contact us today to place your order.
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Where can I get
training on Geoprobe® equipment & what will it cost me?
You are always welcome to visit
us at Geoprobe® Headquarters in Salina, KS. If you come to HQ, we
provide most training services at no charge.
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Where is Salina, KS?
Right in the middle of Kansas, 1.5 hour drive north of Wichita and a 3 hour drive west of Kansas City. This is where the wheat grows tall and the sky meets an endless horizon. Come visit us!
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