Project Summary

Vapor Intrusion Mitigation System for Active Manufacturing Facility

MAE2 was selected to build a Sub Slab Depressurization system for an active manufacturing facility.

The factory has been in continuous use since the 1950’s. In the past, releases of chlorinated solvents, used in the manufacturing process, had contaminated the soil and groundwater beneath the building. Testing confirmed that Volatile Organic Compounds (VOC’s) were migrating into the building. There is no space for the Vapor Mitigation System on the factory floor since this is an active manufacturing facility and all the floor space is needed for the process equipment and the free flow of equipment and workers.
Vapor Intrusion Mitigation System
MAE2 worked with the consultant to design a lightweight unit that could be mounted on the roof and when operating create a vacuum in the sub slab that would prevent the VOC’s from migrating into the manufacturing spaces.

The skids were designed with trouble free, simple weather proof controls to maximize system up time. The skids were built with marine grade aluminum, selected because it is both lightweight and corrosion resistant. The blower design was for the blower to operate at up to 600 SCFM at 16” WC vacuum. The design also included a Variable Frequency Drive (VFD) so that the blower could be adjusted to match site demand and flexibility. A simple touch of a button and the flow can be adjusted up or down to meet any changing conditions.
Vapor Intrusion Mitigation System control layout
The run time and ability to adjust and monitor the system is critical because the factory is constantly occupied with employees. Because the site is several hours from the consultant, it was designed with a simple remote access telemetry system. The consultant receives daily run status reports and alarm notifications via email, allowing them to monitor and adjust the system operation. The system can also be started, stopped and have the flow adjusted simply by logging in from any computer or smart phone.

The system runs continuously and has already run for well over 10,000 hours. The consultant on the project made the following comment.

“The system has been very reliable and has operated on a 24/7 schedule with very little downtime. The remote access makes it easy to check on the system performance without actually having to travel to the site. We are pleased with the system fabrication, production, and support that Mid-Atlantic Environmental Equipment, Inc. has provided for this project.”

Rich Cherico, Project Manager, Amec Foster Wheeler

roof mounted Sub Slab Depressurization system

This Environmental Remediation System uses the following components and subsystems

Pressure Blower
Marine Grade Aluminum Skid
PLC Control Panel

Please contact MAE2 for assistance for all your environmental needs.

Industrial Components for Wastewater Treatment Systems

Many of the requests MAE2 receives are for single components to improve an industrial process or help remove oils or other contaminants from a waste discharge.

Are you looking to replace an existing component or add a piece of treatment equipment to meet permit conditions or simply improve the quality of the liquid or air used in a process?

Oil water separator for industrial water treatment

Oil water separator for industrial water treatment

If you need a Vapor Liquid Separator to remove moisture from a process air flow, an Oil Water Separator to remove free oil droplets from a process discharge, or Carbon Treatment to clean air or water discharges MAE2 has the experience and knowledge to help you find the most efficient and cost effective solution.

Reverse Osmosis (RO) Water Treatment SystemsMAE2 can help with anything from removing oils from shop floor wash water, to creating pure water using Reverse Osmosis Filtration.

The most common requests are for Oil Water Separators and Air Water Separators (Vapor Liquid Separators), but MAE2 can provide recommendations to successfully remove particulates, suspended solids, and dissolved contaminants.

MAE2 can provide these items as standalone units or with the additional switches, controls or components needed to integrate them fully with your existing site and equipment.

Industrial Components for Wastewater Treatment Systems often use the following components and subsystems

City Convenience Store Environmental Remediation Site

MAE2 was selected to design and build a remediation system for a convenience store site in mixed use city location.

The consultant conducted a multiple day test at the site. The pilot study indicated a need for a high vacuum system that could treat extracted groundwater at 10-15 GPM and to remove large amounts of free product gasoline. MAE2 used this data to design a system that would extract and treat groundwater and free product from 6 wells located on site. The water needed to be treated to meet the discharge limits for water quality and suspended solids required by the local POTW.


MAE2 used the pilot test data to design and provide written specifications for a Multi Phase Extraction and Groundwater Treatment system. The system needed to remove and treat TPH-Gasoline concentrations as high as 230,000 PPB and MTBE concentrations of 4,600 PPB along with free product gasoline.

The system uses 3 high vacuum rotary claw pumps, providing over 700 ACFM flow at 18” HG vacuum, to extract impacted groundwater and vapors. The client prefers to use multiple pumps operating in parallel rather than a single large pump. This design provides more flexibility to save energy as site needs change over time, along with redundancy to reduce downtime. The system uses a 6 point custom inlet manifold and a marine grade aluminum 120 gallon Air Water Separator.

A progressive cavity transfer pump is used to pump the water to a 20 GPM Oil Water Separator to remove any free product gasoline. Progressive Cavity pumps are selected because they do not create the chemical emulsification of the gasoline and water that other pumps cause. After the Oil Water Separator removes the free product a centrifugal transfer pump sends the water through a bag filter to remove solids and particles from the water before being treated by an oversized Poly Stackable Tray Air Stripper.

convenience store remediation system.Componentsjpg

The stripper is oversized to provide additional residence time to treat the MTBE. Finally the water is pumped through another bag filter and then two 250 LB Liquid carbon vessels before being discharged to the POTW.

The custom integrated PLC control panel provides runtime hours, vacuum trends, temperature, carbon vessel pressure and water flow totals. The system uses a cellular data connection allowing full system control and data access through easy to use web browser access. The data allows easy access to system operational status and the data needed for writing reports as required by the regulators.

This Environmental Remediation System uses the following components and subsystems

Vapor Intrusion Mitigation System for Brownfield Redevelopment

MAE2 was selected to help design an active Sub Slab Depressurization system for a new construction site that had high levels of TCE and PCE in the soils.

The project goal was to redevelop a former factory building creating new retail, restaurant, and office space. A solution needed to be developed to keep any contaminated vapors in the soils from releasing into the occupied building spaces. Space was a premium, so the system needed to protect the building occupants with as small a footprint as possible.
Rooftop Vapor mitigation system

MAE2 worked with the consultant prior to the building construction to design an active vacuum blower system that had enough capacity to remove any vapors from the sub slab. Three outdoor weather skids that would be placed upon the building roof were selected so that no valuable floor space would be lost.

The skids were designed with trouble free, simple weather proof controls to maximize system up time. A series of slotted pipes were placed underneath the building slab and connected to a main trunk line that extended to the roof and connected to the blowers. The design goal was to prevent any hazardous vapors that reached the sub slab foundation from intruding into the occupied areas above. There were two smaller areas in one building section and a larger area in a second section. The smaller zones were connected to 10 HP pressure blowers and the larger zone was connected to a 20 HP blower. The blowers were designed for vacuum applications and are able to move large volumes of air at 20” WC.

The start up of the sub slab depressurization skids was very successful and the high volume air exchange had significant influence and prevented measurable volumes of TCE, PCE vapors from entering the finished spaces.
Vapor Intrusion Mitigation System for brownfield redevelopment

Active Mountaintop Gas Station Remediation Site

MAE2 was selected to design and build a remediation system for a gas station site in a small mountain town.

The geology of the area is fractured bedrock and the gasoline and MTBE contamination traveled through the fractures and impacted several nearby drinking wells. The consultant conducted a multiple day test at the site. MAE2 used this data to design a system that would prevent the contamination from moving off site and eliminate the source area. This meant the system would need to operate a large number of wells at high vacuum in order to remove the free product and create influence in the fractures to prevent the plume from traveling.

Mountain top gas station remediation

MAE2 used the pilot test data to design and provide written specifications for a Multi Phase Extraction and Groundwater Treatment system. The system needed to remove and treat TPH-Gasoline concentrations as high as 160,000 PPB and MTBE concentrations of 3,500 PPB.
The system uses 3 high vacuum rotary claw pumps, providing over 700 ACFM flow at 20” HG vacuum, to extract impacted groundwater and vapors. The pumps can be run simultaneously or independently depending upon the operational needs of the site.

The extracted groundwater from the individual wells passes through an 18 point custom manifold and settles out in a 220 gallon knock out tank. A progressive cavity transfer pump sends the water to a 20 GPM Oil Water Separator to remove any free product gasoline. A centrifugal transfer pump sends the water through a bag filter to remove solids and particles from the water before being treated by an oversized Removable Tray Air Stripper. The stripper is oversized to provide additional residence time to treat the MTBE. Finally thewater is pumped through another bag filter and then two 250 LB Liquid carbon vessels before being discharged to a mountain stream.

Gas station remediation equipment

Finally the system will provide runtime hours, vacuum trends, and water flow totals recorded through the PLC control panel. The cellular connection allows full system control and data through easy to use web browser access. This is a vital because the town is remote and susceptible to power outages. The system can be restarted without requiring a time consuming trip, maximizing runtime.

This Gas Station Site remediation System uses the following components and subsystems

gas station environmental equipment
Rotary Claw Vacuum Pump
removeable Tray Air Stripper
PLC Control panel
Bag Filter
Carbon Filtration
Oil Water Separator
Vapor Liquid Separator
Centrifugal Transfer Pump
progressive cavity Transfer Pump

Former Gas Station Remediation site

MAE2 was selected to design and build a remediation system for a closed gas station site in a mixed residential/commercial area after providing the most responsive and cost effective bid.

The consultant put out a request for proposals (RFP) for a dual phase remediation system with groundwater treatment that requested a combination of down well groundwater pumps high vacuum SVE (Soil Vapor Extraction) using 12 wells in order to remove the free product and lower the dissolved phase gasoline concentrations to reach site closure standards.

Former Gas Station environmental remediation system

MAE2 responded to the RFP by proposing a high vacuum oil sealed LRP (liquid ring pump) along with 12 QED pneumatic auto pumps to dewater the wells and expose more soil the influence of the SVE. The LRP was chosen because the immediate proximity of residential neighbors required a pump that operated more quietly than other high vacuum options. The pneumatic auto pumps operate on demand with a 15 HP reciprocating air compressor providing the air supply needed for pumping.

The Groundwater Treatment system consisted of an oil water separator the remove free product and an removable tray air stripper to remove the dissolved phase gasoline before discharging to surface water. At system start up the groundwater pumps maintained a groundwater pumping rate of 30 GPM and the LRP maintained a vacuum influence of 20” HG across the site. A steel frame building with sound hoods and sound insulation inside the walls was chosen because of the numerous nearby residences.

The regulatory agency requires consistent run time for all approved systems. The system provides run time hours, vacuum trends, and water flow totals recorded through the PLC control panel. The cellular connection allows full system control and data through easy-to-use web browser access. The instant alarm notification and remote control allows the consultant to immediately respond to any changing site conditions and maximize system run time.

This Gas Station Site remediation System uses the following components and subsystems

Oil Sealed Liquid Ring Vacuum Pump
Removable Tray Air Stripper
PLC Control panel
Oil Water Separator
Vapor Liquid Separator
Centrifugal Transfer Pump
Progressive Cavity Transfer Pump
Reciprocating Air Compressor
Down well Pneumatic Pumps

Municipal Landfill Project to Remediate PCE, TCE, Vinyl Chloride and Methane

Municipal Landfill Project Equipment for the remediation of PCE, TCE, Vinyl Chloride and Methane

MAE2 has a full range of systems for recovery of landfill methane and VOC contamination.

Landfill systems operate in some of the harshest conditions and must be designed with those conditions in mind. MAE2 has the experience and capability to build a landfill gas system for your specific application. Blower sizing, material compatibility, and NEC electrical classification design are all critical to the success of your project.

MAE2 was contacted by a municipal landfill to replace the main components of an existing blower system that operates within a landfill cell that is contaminated with PCE, TCE and Vinyl Chloride along with methane. The blower extracts the contaminated VOC’s and methane and then a propane enhanced flare destroys the contamination. The blower had failed and the vapor liquid separator had corroded from exposure to the elements and the solvents.Equipment_Remediate_PCE_TCE_Vinyl_Chloride_Methane

MAE2 recommended our Marine Grade Aluminum Vapor Liquid Separator to offer better protection from the corrosive VOC’s and the exposure to the weather.
MAE2 selected a regenerative blower based upon the system performance needs and the existing site conditions. The landfill was able to benefit from a lower cost blower selected to meet their current needs rather than replacing the existing blower with the same model. MAE2 assisted with the connection and integration of the new equipment into the existing system and provided complete start up and testing. MAE2 was able to use our experience to help this municipal landfill operation select and implement a cost-effective solution that will keep them operating trouble free for years to come.

This Landfill remediation project uses the following components and subsystems

Regenerative Vacuum Blower
Marine Grade Aluminum 60 Gallon Vapor Liquid Separator

MAE2 Selected for a second Air Sparge System at an Aeronautical Launch Site

This system, for a different customer, will include approximately 300 wells spread across the site

Air sparge system for environmental remediation

MAE2 was again selected after a competitive bid process to build and start up an integrated Air Sparge system for a second site at an aeronautical launch center. The system was designed to re-mediate a solvent plume around the launch pad site. There are almost 300 wells spread across the site in order to create high air flow and radius of influence across the plume. The system design included programmable timers that allow the user to rotate air delivery through the different site areas as desired.

The project included remote operation and monitoring so that the performance could be viewed and adjusted as required. The completed system included a 100 HP variable speed rotary screw compressor capable of providing up to 525 CFM. The compressor automatically adjusts to provide only the air demand needed at any given moment which saves electricity and prolongs the life of the equipment. The System controls display and log temperature, pressure and CFM flow for the compressor and well field areas. The set points and operation timers can be adjusted remotely by phone or computer to maintain optimum efficiency.

The system was installed in a utility trailer custom designed to handle the size and weight of the compressor. Custom duct-work and climate control were designed to keep the interior of the trailer at the low temperature and low humidity that the compressor requires for proper operation.

This Air Sparge System uses the following components and subsystems

Remediation Site of a Former Gas Station in a Rural Area

MAE2 was selected to design and build a remediation system for a retail gas station based upon the results of a pilot study.

The consultant conducted a multiple day test at the site and learned that the soil structure was very tight and there was limited radius of influence. This meant the system would need to operate a large number of wells at high vacuum in order to remove the free product and lower the dissolved phase concentrations to reach site closure standards.

The site is located in a very rural area and only single phase electrical power is available. MAE2 included a Rotary Phase Converter to convert the power to the three phase power needed to operate the larger motors. The site needed three phase voltage in order to meet the NEC, Class 1 Div 2 environment required for equipment operating in the potentially explosive environment created by removing and treating gasoline vapors

MAE2 used the pilot test data to design and provide written specifications for a Multi Phase Extraction and Groundwater Treatment system. The system will use a high vacuum rotary claw pump to extract impacted groundwater and vapors. The groundwater will be treated with an oil water separator to remove free product and then pass through an air stripper and liquid phase carbon to treat the dissolved phase gasoline.

Finally, the system will provide run time hours, vacuum trends, and water flow totals recorded through the PLC control panel. The cellular connection allows full system control and data through easy-to-use web browser access.

This Gas Station Site remediation System uses the following components and subsystems

Marine Research Groundwater Treatment System

Variable Flow Industrial Process Treatment System

MAE2 was tasked with designing a system to treat process water to remove iron and fuel contamination for a marine research center. The research center used local groundwater to supply fresh water to fish tanks used for scientific research. The groundwater had been impacted with fuel from a nearby gas station and was high in iron bacteria. The fuel needed to be removed from the water to keep the fish healthy and the iron needed to be removed to keep it from fouling the drum filters that provided the filtered water required in the tanks. The system needed to handle flows that ranged from 8 GPM to peak flows of 45 GPM. The facility wanted to reduce electrical power costs by only operating at full power during peak times and adjusting the power down during lower flow periods.

MAE2 designed a system with a fully automated PLC control panel. The PLC constantly measures the incoming flow rate and uses Variable Frequency Drives (VFDs) to adjust the motor speeds to match the flow rate. The PLC controls also monitor system pressures and automatically initiates a system backwash to clear the iron filters and reduce manual cleaning labor. The system is designed to keep a continuous water supply to the research tanks even during the back wash cycles.

This turnkey MAE2 solution reduces on site maintenance, electrical power usage, and provides treated process water in a compact fully automated package that adjusts to the constanly changing site conditons. This system is expected to go online this upcoming summer.

Click on diagram to see another.

The groundwater treatment system consisted of an aeration chamber and slant plate clarifier to precipitate and collect iron, a removable tray air stripper to remove the dissolved gasoline, a back-washing filtration media system to remove any fine particulate and finally liquid carbon media vessels as a final safety to remove any potential remaining gasoline.

This Marine Research Groundwater Treatment System uses the following components and subsystems