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||ETV Soil Sampling Technology - Simulprobe Technologies, Inc. Core Barrel Sampler
The Core Barrel Sampler is a soil sampling tool
capable of collecting unconsolidated subsurface material to depths
that depend on the capability of the advancement platform. The
Core Barrel Sampler can be advanced into the subsurface with direct-push
platforms, drill rigs, or manual methods. The Core Barrel Sampler
was demonstrated in May and June 1997 at two sites: the Small
Business Administration (SBA) site in Albert City, Iowa, and the
Chemical Sales Company (CSC) site in Denver, Colorado. These sites
were chosen because each has a wide range of volatile organic
compound (VOC) concentrations and because each has a distinct
soil type. The Core Barrel Sampler was compared to a reference
method (hollow-stem auger drilling and split-spoon sampling) in
terms of the following parameters:
- sample recovery,
- VOC concentrations in recovered samples,
- sample integrity,
- reliability and throughput, and
The demonstration data indicate the following performance
and cost characteristics:
- Average sample recoveries for the Core Barrel
Sampler were higher in clay soil and lower in sandy soil.
- There was a statistical difference between
the VOC concentrations for two of the twelve Core Barrel Sampler
and reference sample method pairs at the CSC site.
- The integrity of the unlined chamber of the
Core Barrel Sampler was not preserved, in eight of the fourteen
integrity tests, when the sampler was advanced through highly
- The Core Barrel Sampler reliability to collect
a sample in the first attempt was lower than that of the reference
sampling method in both clay and sandy soils.
- The average retrieval time for the Core Barrel
Sampler was quicker then the reference method in clay soil
but slower in sandy soil.
- The Core Barrel Sampler costs for both clay
soil and sandy soil sites were lower than the reference sampling
- The cost depends on the amount of samples required,
the sample retrieval time, soil type, sample depth, and the
disposal costs associated with drill cuttings. A site-specific
cost and performance analysis is recommended before selecting
a subsurface soil sampling method since with any technology
selection, the user must determine what is appropriate for
the application and project data quality.