The installation of a groundwater monitoring well, so that it is screened across the top of the water table, enables the collection of groundwater samples to determine the quality of the groundwater beneath the site.
The purpose of the installation of groundwater monitoring wells is to determine whether there has been any impacts to the groundwater beneath the site, either from on-site or local area activities. It is not uncommon for contamination (such as fuel stored in underground storage tanks) to leach through the soil/rock profile and impact the groundwater beneath the site. Additionally, because groundwater typically flows towards the nearest open water body, contaminated groundwater from up hydraulic gradient sites has the potential to impact the groundwater further down gradient.
Should anthropogenic contamination be identified in the groundwater, sourced from either historical or present on-site sources, groundwater remediation may be required. A number of different groundwater remediation technologies are available. Prior to any remediation be undertaken, a remediation action plan (RAP) will be prepared, to determine the most effective remediation option.
Remediation of groundwater may be required where contamination is considered to provide an imminent hazard to human health, where a CUTEP process is to be undertaken or as part of an Environmetnal Site Assessment / Detailed Site Investigation. In such circumstances, a number of factors are taken into account to judge what type of remediation program is to be undertaken. This may involve simple extraction and disposal of contaminated water, or more complex thermal heating and injection programs.
Groundwater assessments are often required during an Environmental Site Assessment, however, they may be undertaken at any time for due diligence or independent purposes.
Modelling of groundwater contamination provides a useful tool for anticipating the future extents of contamination plumes and their potential impacts to off site receptors. AGS can undertake this modelling in conjunction with a groundwater assessment in order to assist in the assessment of potential environmental and human health risk.