Connolly Environmental


Minimise environmental risk and meet regulatory obligations.

Remediation Capabilities

Connolly Environmental has experience in the remediation of a wide variety of contaminants in soil and groundwater. Upon identification of your remediation needs we will develop a remedial plan tailored to your circumstances in order to minimise environmental risk, meet regulatory obligations, and minimise costs and time.

Our remediation capabilities include:

  • Multi-phase vacuum extraction (MPVE) for removal of free-phase product and dissolved phase groundwater.
  • Pneumatic air-lift (PAL) systems for removal of free phase product and dissolved phase groundwater.
  • Soil vapor extraction for removal of hydrocarbon vapor.
  • Biopile construction and bio-venting systems using our MPVE unit.
  • Regenox/ORC injection using our Geoprobe GS2000 injection system.
  • In Situ Chemical Oxidation (ISCO) using our Geoprobe GS2000 injection system.
  • Pump and treat systems.
  • Bioremediation.

Our ability to deliver quality outcomes to our clients, within tight time frames and budgets, is enhanced by the range of equipment we own and operate ourselves. This removes our reliance on external contractors. We continue to invest in the equipment needed to ensure that all stages of work are carried out to the high standards set in our mission statement.



Multiphase Vacuum Extraction

Multiphase vacuum extraction (MPVE) is a remediation technology used to remove free phase product, contaminated groundwater and fuel vapor from the subsurface via extraction wells. It can also be applied to extract fuel vapor rapidly and efficiently from contaminated soil stockpiles.

The Connolly Environmental mobile MPVE unit uses a large displacement internal combustion engine with a field-adjustable electronic engine management system to extract and combust volatile contaminants. Engine operating parameters are continuously logged and are monitored and adjusted in the field by the Connolly Environmental scientist or engineer.

The MPVE unit was designed and constructed by Connolly Environmental and uses engine inlet manifold vacuum to remove liquid and vapor phase contaminants from soil stockpiles or the groundwater/soil interface. The operator-controlled engine management system and the overall design of the MPVE results in highly efficient operation, and assists us in collecting the data needed to document the remedial process.

During MPVE operation our field engineers and scientists use real-time data to maintain optimal MPVE performance.

The trailer-mounted MPVE unit is able to be used on operating sites or sites with difficult access with minimal disruption to site users.,

Bioremediation of fuel-contaminated soil

This process works by providing a warm, moist and nutrient-rich soil environment conducive to soil microbe activity. The contaminated soil is typically built into a lined and covered stockpile, with water and nutrients (urea and other compounds) added during construction. The soil microbes digest the petroleum hydrocarbons present in the soil, breaking them down into non-toxic compounds (principally carbon dioxide and water vapor). Where there is space and time available, bioremediation is a very cost-effective alternative to expensive landfill disposal.

Groundwater remediation by injection of remedial compounds

This process is able to target groundwater contamination beneath structures, at depths and in situations where surface disturbance must be kept to a minimum. The remedial compounds typically act by stimulating and accelerating natural biodegradation processes. By using our Geoprobe drill rigs for the placement of remedial compounds we minimise site disturbance, ensure accurate placement of the remedial compounds, and minimise the time required for each round of injection. This is a proven in-situ remediation technology for the clean-up of chlorinated solvents, fuel and oil.


Past Remediation Projects

Groundwater remediation, Killara NSW

This was a 12 month program to remediation free-phase fuel using our MPVE unit. The work was conducted as part of a long term remediation and monitoring program at the site.

Groundwater remediation & soil vapor extraction, St Kilda Vic

This MPVE remediation work was conducted to enable high-density residential redevelopment of a former taxi depot. The work formed part of that required for Statutory Environmental Audit.

Groundwater remediation using MPVE, Abbotsford Vic

We conducted this MPVE remediation work as part of remediation to enable revelopment of a former service station into a new service station and fast-food restaurant.

Biopile remediation, Collingwood Vic

This work comprised remediation of 600 tonnes of fuel-contaminated soil classified as EPA Category A contaminated soil for offsite disposal. We mounded the soil into a covered stockpile around a system of slotted piped manifolded to our MPVE unit. The MPVE unit was then used to strip volatile fuel compounds from the soil, enabling it to be reclassified as EPA Category C contaminated soil for offsite disposal. The outcome provided a significant cost and time saving to our client.

Soil remediation, Brunswick East Vic

Soil remediation does not always involve active soil treatment. In this case the site was underlain by a former clay pit which had been backfilled years ago with a mixture of soil and industrial waste. Most of this material was classified as EPA Category A contaminated soil for offsite disposal. We were able to demonstrate to EPA that the contaminants present in the backfill were immobile and non-volatile. EPA was then able to issue a site-specific classification enabling the material to be disposed of as EPA Category C contaminated soil. The outcome provided a significant cost and time saving to our client.