PFAS Statement Form

PFAS Statement Form - DIA

PFAS contamination in soil and groundwater is present at DIA at varying concentrations throughout the precinct. Source areas include historic landfills, fire training grounds and areas where fire-fighting foam has been released.

Construction activities, including new developments, infrastructure, facilities and maintenance projects, where soil excavation or interaction with groundwater takes place, are required to obtain a PFAS Statement as part of the Excavation Permit and Airport Building Control (ABC) approval process.

The purpose of the PFAS Statement is to undertake a risk assessment to establish the likelihood of encountering PFAS-contaminated soil and/or groundwater during excavations and outline the controls to be put in place to mitigate the risk to both personal health and the environment.

Step 1:

Complete and submit this form.

Step 2:

Once this form is submitted the Airport’s Environment and Sustainability Manager will assess the risks and outline any further environmental controls required. The signed form will then be returned to the applicant. A copy of this signed form must then be submitted as part of the ABC application along with an Excavation Permit.

Step 3:

If excess soil or slurry will be generated from the excavation, an Application for Stockpiling of Materials Form must be completed prior to moving the soil /slurry to the airside stockpile area.

Note: Checks will be undertaken at random to ensure all risk control measures outlined are being complied with.

To be completed by Applicant

Name of Project *Per- and poly- fluoroalkyl substances (PFAS) Statement

Project Scope

The purpose of the work is *

The proposed work will involve the excavation of soils (include dimensions and depth): *

Please include the Name of Site, Address, and Grid Reference *

Will a hydrovac be utilised for any portion of excavation? *

YesNo

Will excavation be opened and closed on same shift? *

YesNo

What is the quantity (if any) of temporary stockpiling required at the site? *

Timing of Works

Commencement Date

Duration

Site Project Manager

Name *

Email *

Signature *

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Date

Additional documents

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Design drawings, historic contamination assessments etc.

To be completed by the Environment and Sustainability Manager

Potential PFAS risks

In referencing DIA’s grid map against DIA’s Contaminated Sites Register, we highlight known potential sources of soil contamination for PFAS related to this site are

Historic Landfill (IS07) - Grid Reference R8Aviation Rescue Fire Fighting Station (IS12) - Grid Reference M13Northern GA (IS03) - Grid Reference P13Old Aviation Fire Fighting Training Ground (IS04) - Grid Reference O11

Do known historical site uses of the proposed construction area suggest activities/ incidents potentially associated with PFAS use? *

YesNo

Has PFAS concentration sampling been undertaken in the construction/work areas?

What is the approximate range of recorded groundwater depth?

What is the risk of uncontrolled dewatering?

In considering the PFAS National Environmental Management Plan and the the National Environment Protection (Assessment of Site Contamination) Measure 1999 (the ASC NEPM), DIA considers the risk of PFAS in these areas to be *

LowMediumHigh

Additional comments

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PFAS Risk Controls

Soil

Further environmental testing required to determine if soil permitted to leave project site and/or determine stockpile management requirements.Temporary stockpiling will occur at each individual excavation site where appropriate.Plastic sheeting required under any temporary stockpiles.All excavations are to be backfilled on the same day.Excavations to be covered and protected from runoff if rain likely.Fill or hydrovac slurry that is a surplus to refill needs, that has not come into direct contact with groundwater, must be relocated to an area designated by the ADG Environment and Sustainability Manager at the airside stockpile area under a stockpile application form.

Groundwater

Stop work and contact ADG Environment and Sustainability Manager if an excavation meets groundwater.Test drilling will occur prior to excavating to ascertain the groundwater level at the site. If groundwater levels are within 0.4 metres below the required excavation depth then the Environment and Sustainability Manager will be notified. A nominated groundwater receiving site, for any potential dewatering from the project (within close proximity of the excavation site), will be selected in conjunction with the Environment and Sustainability Manager.All hydrovac works that have come into contact with groundwater are not permitted airside.

Additional controls

Work Health and Safety

PFAS levels in groundwater will likely be above the recreational guideline.Given this, it is advised that dermal contact and ingestion with the groundwater by construction workers is avoided. The guidelines are very conservative however, the PFAS NEMP states this inbuilt conservatism is necessary when deriving screening values to be protective of communities. PPE, including face masks and gloves, should be used to manage risk around this hazard.

Trigger for further assessment works

The proposed scope of works for this project should be acknowledged by the Department to be low risk with regards to potential PFAS contamination risks.At this point no further investigation and/or assessment is warranted based on the works being conducted.

Additional comments

Additional documents

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Limitations

In preparing this report, Darwin International Airport (DIA) has relied upon data, surveys, analyses, designs, plans and other information provided to DIA by other individuals and organisations. Except as otherwise stated, DIA has not verified the accuracy or completeness of the data. To the extent that the statements, opinions, facts, information and/or recommendations in this report are based in whole or part on the data, they are contingent upon the accuracy and completeness of the data. DIA will not be liable in relation to incorrect conclusions should any data, information or condition be incorrect or have been concealed, withheld, misrepresented or otherwise not fully disclosed to DIA.

This statement is intended for the sole use of Airport Building Controller (ABC) and only for the purpose for which it was prepared, to assist in the assessment of Building Approval Applications as required under the Airport (Building Control) Regulations 1997.

Environment and Sustainability Manager

Is this PFAS Application Approved? *

YesNoRequires More Information

Detail information required *

Detail Reason for Application Refusal *

Name *

Date

Signature *

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