Volatile Organic Compound RemediationWe have tested and remediated over 30,000 homes and more than 40 schools
NJ DEP has formally recommended the use of certified Radon mitigation firms to design and install VOC reduction systems.
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Remedial Techniques
VOC mitigation is similar in method to Radon mitigation. A sub-slab depressurization system reduces the driving-force that moves the VOC vapors into the building, and at the same time replaces the contaminated soil gas with cleaner makeup air. While remedial investigation and remedial action of the vapor source are ongoing the effectiveness of the remedial action are by collecting verification samples.
Some remedial action techniques are listed below:
Sealing openings and cracks with caulk or expanding foam (preferably volatile-free)
Repairing compromised areas of the slab or foundation
Covering and sealing exposed earth and sump pits
Installing a sealed vapor barrier (e.g. plastic sheeting, liquid membrane) over earthen, gravel, etc. floors or crawlspaces
Utilizing natural ventilation
Installing a subsurface depressurization system
Installing a pressurized air curtain
Utilizing house pressurization
Utilizing heat recovery ventilation
Installing a soil vapor extraction system
Installing Remedial Techniques
Sub-Slab Depressurization can be used when a building has a slab (e.g., concrete) floor
Sub-Membrane Depressurization can be used when a building has an earthen (or gravel, floor or crawlspace, as opposed to a slab.
Block-Wall Depressurization can be utilized when a building has a block wall
Drain Tile Depressurization can be utilized when a building has a loop of perforated drain tiles (piping) adjacent to the building footers for water drainage.
Sub-slab depressurization systems are the most common remedial action technique. Piping is installed in the subsurface beneath the slab and a fan is used to create a negative pressure field in the sub-slab area and discharge any vapor outside the building. Depending on the size of the slab and the characteristics of the sub-slab material, piping may have to be installed beneath the slab in multiple locations in order to create a negative pressure field across the entire sub-slab area. Piping configurations depend on the construction and design of the building of concern.
The principal of sub-slab suction is to vent the soil gas, which accumulates under the slab away from the structure.
The installation of a sub-slab suction system can reduce indoor levels by 80% to 90%. In some cases, 99% can be achieved depending on the soil composition and structure.
Hera Environmental provides highly qualified and skilled staff with additional strength of state of the art Laboratory facility and instruments to perform extensive testing and remediation.
