Given the importance of thin layers in geohydrological contaminant investigations, and the necessity of identifying the precise location of contaminants in the vertical profile, these drawbacks are critical and prevent professionals from providing an internationally acceptable service when using such drilling and sampling methods. Samples of water, soil, and gas vapour can rapidly be collected from up to 30 m beneath the surface in unconsolidated deposits. Using such a system, undisturbed continuous or discrete core samples can be obtained from above and below the water table. Samplers to obtain groundwater or soil vapour samples, or permanent sampling piezometers can also be installed. Direct push provides the most economical means of retrieving undisturbed core samples for sedimentological, geochemical and geological interpretation.
Core samples enter trough a cutting shoe into an inner liner fitted with a core catcher.
The liner system saves time in sample recovery, as only the liner needs to be removed while the outer tubing stays in the ground. Since the dual tube system seals keeps the hole open while core is extracted, even in saturated collapsing sand conditions, further sampling at deeper levels is possible. Some core samples taken by direct push Groundwater samples are collected by the placement of small diameter piezometers. Piezometers, filter packs and grout are installed through the inner casing, thereby maintaining sidewall integrity. You can also utilise the piezometers as air sparging points, or to introduce oxygen releasing compounds for the remediation of contaminated aquifers.