Controlled Waters

Surface and groundwater contamination can be harmful to the health of humans and also animals and plants that rely on water. It can also damage property and interfere with amenity/industrial uses in the area.

Groundwater contamination is difficult to control and can extend beyond the site in question, presenting a 3rd party liability. Our high-level of technical expertise allows us to offer our clients a realistic assessment of the spatial extent and behaviour of contamination in the environment and whether sensitive receptors are being affected. PBA has an excellent record of statutory approval in the derivation of remedial targets which are not only protective of the environment but feasible and cost-effective.

Our controlled waters risk assessments include:

  • Detailed assessment of soil and groundwater contaminant load and behaviour
  • Dimension and longevity predictions of groundwater plumes
  • Derivation of soil and groundwater remediation targets
  • Evaluation of DNAPL (heavy oils, solvents) and LNAPL (petrol, diesel) migration in groundwater
  • Prediction of degradation rates for dissolved contaminants

Among the methodologies used in our assessments are:

  • P20 – Allows for the derivation of remedial targets for soil and contaminated groundwater
  • CONSIM – Probabilistic model which allows the estimate of plume dimensions and contaminant fate over time, recommended for sites with complex geology
  • Degradation Models – Site-specific estimates of contaminant attenuation/degradation rates due to natural processes. Frequently requested to sustain Monitored Natural Attenuation remediation strategies