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.