Direct Push soil & water Sampling
Cascade drilling’s fleet of Geoprobe® equipment includes rigs as small as a 420M, and 54LT up to the full sized 8040DT. These systems can be used to perform subsurface soil, water or vapor surveys. They are capable of obtaining soil and groundwater samples, installing monitoring wells / pre-packed monitoring wells, geotechnical capabilities (equipped with 140# hammer), piezometers, inclinometers, vapor implants, and injecting a variety of remediation compounds.
Advantages of direct-push sampling capabilities include:
- Increases sampling alternatives – soil, soil vapor, and groundwater
- Provides flexible range of sample intervals
- Minimizes waste disposal requirements
- Provides minimal disturbance to samples
- Minimizes need for permanent sampling points
- Features minimal intrusions to site
- Increases speed of site characterization
- Provides on-site analysis and results
The Geoprobe® PRT (Post Run Tubing System) system can be used for soil-vapor collection, The tubing is ran from the bottom of the boring to the purging pump and then to the sampling container. Cascade has the PRT system and other tooling configuration available for sampling soil vapor. One method of soil vapor sampling is to draw from a sampling port using a gas-tight syringe and inserted into your sample container. Another method is to have a three-way valve connected to the tubing running from the bottom of the boring, one to the purging pump and the other to the sampling container for an undisturbed soil vapor sample. Cascade also provides many other tooling and material configurations for sub-slab sampling as well.
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Soil samples can be collected using several different-sized sampling systems. Cascade is equipped with most of Geoprobe’s Soil Sampling equipment. The type of soil sampling equipment utilized on a project will depend on the amount of soil samples required, soil conditions at the project site, and the objective of the project. Soils samples can be collected in clear plastic (PVC), Teflon (PTFE), brass, or stainless steel liners, depending on project requirements. These liners can easily be capped and sent to a laboratory for analysis.
Groundwater samples can be collected utilizing Screen Points, Mill-slotted Well Points, Peristalitc Pump, Tubing and Check Valves, Mini Bailers, and Screen Implants. The method to be chosen for groundwater collection depends on the aquifer's characteristics, sample contaminants, and the objectives of the project.
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Cascade has the ability to install monitoring wells. The type of well completion will depend on the soil characteristics and the objective of the project
Injection of Remedial Compounds. We have the ability, experience and expertise required to inject all manners of in-situ remediation compounds. Cascade utilizes Geoprobe and other rod accessories and pumps to inject compounds at desired depths and intervals. Cascade is capable of "bottom up" or "top down" injections.
The volume, depth and interval of injection is dependent on the solid and groundwater characteristics, contaminant types, and the remediation goals for the project.
Dual Tube Sampling
Dual Tube Sampling Systems are efficient methods of collecting continuous soil cores. Dual tube sampling uses two sets of probe rods to collect continuous soil cores. One set of rods is driven into the ground as an outer casing. These rods receive the driving force from the hammer and provide a sealed hole from which soil samples may be recovered without the threat of cross contamination. The second, smaller set of rods are placed inside the outer casing. The smaller rods hold a sample liner in place as the outer casing is driven one sampling interval. The small rods are then retracted to retrieve the filled liner.
Dual Tube Sampling Benefits Include:
- Continuous coring for faster sampling in intervals over 20-feet.
- Continuous coring in both saturated and unsaturated zones.
- Cased hole eliminates cross contamination.
- Optional solid drive tip seals system for driving to top of sampling interval or for split interval sampling.
- Perform bottom-up pressure grouting while retracting outer casing.
- Set monitoring wells through outer casing after collection of soil core.
- Expendable cutting shoes available.
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