Direct push technology is more cost effective than using conventional drill rigs when completing soil borings or installing wells. Sampling speed is faster for direct push tools and another widely accepted advantage of the direct push technology is the fact that fewer wastes are generated for disposal. Test borings and/or wells by direct push technology can produce accurate ground water sample results, adequately define the water table interface, and be used for the measurement of other physical parameters such as slug tests or pump tests. Studies show that direct push technology provides a highly efficient method for the measurement of the physical parameters used in site investigation and remediation. The subsurface and subsequent samples are less disturbed and therefore more representative of the in-situ conditions when using direct push technology versus conventional hollow stem auguring or rotary drilling. Studies suggest more representative concentrations are detected in direct push borings, either due to less disturbance of the subsurface or less mixing/dilution of the ground water through more discrete sampling intervals.
Recovering the desired samples or information minimally disrupts the site. A small hole (1.25 to 3.5" diameter) is drilled through concrete or blacktop surfaces, and is easily patched. Field cleaning of sampling equipment is minimized by the use of expendable drive points, vapor sample tubing, and soil sample liners. Soil samplers are easily field cleaned with minimal decontamination waste generated. Direct push technology greatly reduces or eliminates soil cuttings where only desired discrete samples can be obtained.
DPA system is extremely versatile and well suited for
environmental test borings in cramped spaces and where
overhead lines may be a problem. Currently, DPA operates
two Geoprobe® Model 5400 probes mounted in Ford F-250
four-wheel drive trucks, a Geoprobe® Model 6600DT Series probe mounted on tracks
(48-inches to 60-inches wide with auguring capabilities), and a Geoprobe® “hand
cart” unit mounted on a 32.5-inch axle for work inside
buildings such as dry cleaners.
significant distinction between Direct Push Analytical and “the
other guys” is that we use the most current Geoprobe® technology
available in sample tooling. For instance, dual tube soil sampling
capabilities come with every probe we operate. The dual tube
system allows for continuous, discrete soil sampling to depth.
Dual tube soil sampling eliminates slough, casing the hole off
as you proceed, ensuring the sample we provide is from the exact
depth at which we say. Dual tube tooling is also particularly useful in that it allows for the installation of temporary or permanent PVC well material for collection of groundwater samples after the soil samples have been collected. The dual tube system prevents natural formation collapse that you would have if using the macro-core system for soil sampling. A groundwater sample can easily be obtained from the temporary PVC with poly tubing equipped with a check valve and/or peristaltic pump. It provides the sample integrity one would
achieve sampling through hollow stem augers, however, sample
collection is achieved much quicker. We can provide literature,
which describes dual tube sampling (2.25-inch diameter used
with the 5400 Models and 3.25-inch diameter available with the
66DT Model) in greater detail, or you can visit www.geoprobe.com. Direct
Push Analytical Corp. operates only Geoprobe® tooling
and equipment because we believe that Geoprobe® is the industry
Direct Push Analytical’s other core competency is offering Membrane Interface Probe (MIP) services. The MIP system is very beneficial on projects with limited data and where contamination delineation is time-dependent. The primary benefit of the MIP system is the ability to perform in-situ analysis for organic compounds minimizing the time required to collect samples for analysis. By using the MIP technology, it allows the consultant to achieve more data in a shorter period of time.
Other substantial conveniences include the ability to provide real time, on-site or in-situ analyses. Real time data addresses unexpected findings, which often occur with subsurface investigations and allows for immediate, same day adjustments in the environmental program. Repeat site visits for drilling or remediation excavation or design can be eliminated or minimized by utilizing our mobile laboratory or the MIP technology. For Mobile Laboratory and/or MIP Technology information, please direct yourself to each respective section in the menu window.