Vapor intrusion is the movement of chemical vapors—such as petroleum compounds, perchloroethylene (PCE), or trichloroethylene (TCE)—from contaminated soil or groundwater into buildings through cracks, utility lines, or foundations.

Vapors usually originate from:

• Gasoline stations and petroleum releases

• Dry cleaners using solvents such as PCE

• Industrial spills or leaks

• Abandoned or leaking underground storage tanks

Yes. Prolonged exposure to certain volatile organic compounds (VOCs) may increase health risks and create liability for property owners. NJDEP requires investigation when there is evidence of potential vapor intrusion.

The only reliable method is environmental testing. Oak Environmental collects:

• Soil gas samples using subsurface vapor points

• Indoor air samples using certified sampling canisters

Results are analyzed by accredited laboratories and compared to NJDEP screening levels.

Testing is typically required when:

• A property is near a known contaminated site

• A Phase II ESA identifies VOCs in soil or groundwater

• NJDEP issues a directive for vapor intrusion evaluation

A Vapor Intrusion Pathway Evaluation is the process of reviewing laboratory results, building use, and environmental data to determine whether vapors are entering indoor air. It is a required step in the NJDEP’s Site Remediation Program.

If elevated vapor levels are found, Oak Environmental designs and installs mitigation systems such as:

• Sub-slab depressurization systems (similar to radon systems)

• Ventilation systems to reduce indoor concentrations

• Ongoing monitoring to verify effectiveness

All work is completed to NJDEP standards to protect health and property value.

Yes. Lenders and attorneys often require documentation showing vapor intrusion has been tested and addressed. Without a mitigation plan or NJDEP-compliant evaluation, deals may stall or fall through. Oak Environmental provides lender-ready reports to keep transactions on track.

Responsibility is typically negotiated during the transaction. However, either party must ensure compliance with NJDEP regulations. Oak Environmental provides clear data, risk explanation, and defensible reports to support negotiations.

Oak Environmental offers:

• Licensed professionals with decades of NJDEP compliance experience

• Fast, accurate testing and reporting

• Defensible reports accepted by lenders, attorneys, and regulators

• Clear guidance to protect property value and client interests

Our mission: Safe. Compliant. Clear.