Monitoring Wells

Monitoring Wells Drilling

DPP uses direct push technology to install wells for monitoring either groundwater or soil vapour. These offer a highly cost-effective and minimal-intrusion technique for collecting data on the distribution of groundwater or contaminants in the sub-surface and are typically used to provide trend analysis of contaminant concentrations over an extended period of time.

For groundwater sampling DPP uses small diameter wells (up to 50mm ID) with prepacked screens comprising standard slotted PVC well screen pipe surrounded by environment-grade sand contained within a stainless steel mesh cylinder. This ensures the filter media is directly located around the well screen and allows quicker, more efficient installation.

Groundwater flows into the well under ambient hydrostatic pressure and can be sampled using either mini-bailers or pumps to obtain high integrity water quality samples.

Direct push technology uses a number of techniques to obtain soil gas samples. Single-tube methods provide sampling at single depths as the tool string is advanced and is often used during surveys to define or locate a plume. Dual-tube methods provide soil gas profiling at multiple depths and also allow the installation of high integrity soil gas implants or pre-packed vapour monitoring wells using similar techniques to those used for groundwater sampling.

Prepacked monitoring wells

As well as installing conventional monitoring wells DPP also uses pre-packed screens that are inserted down the drill bore when the specified depth has been reached. These pre-packed wells offer significant advantages over conventional wells including.

  • Installation is quick and generates no cuttings requiring costly disposal techniques from contaminated sites.
  • Prepacked screens ensure the integrity and placement of the filter media during well construction.
  • Implants or wells can be set at any depth attained by probe.
  • DPP can meet stringent decontamination standards for equipment to prevent cross contamination and erroneous results.
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