Adventus Americas EHC-O(TM) Technology Selected by STS Consultants to Remediate PVOCs in Groundwater; Innovative Oxygen-Releasing Compound Offers Best Overall Cost, Performance and Reliability.

HARTFORD, Conn. -- Adventus Americas Inc. (AAI) have announced the selection of their proprietary EHC-O(TM) product by a leading engineering consulting firm, to remove high levels of petroleum volatile organic carbons (PVOCs) from groundwater at a site in Wisconsin. AAI's oxygen-releasing compound will be easily injected into a series of injection points using a Direct Injection method. The product will be mixed with water on-site into a slurry. The EHC-O content of the slurry will be varied to accomplish the desired injection volume, based on previous experience at the site.

Mr. Mark M. Mejac, Senior Hydrogeologist and Project Manager for STS Consultants, Inc. in Milwaukee, stated: "The remedial action at this site employed in-situ bioremediation that is facilitated by the use of an oxygen releasing compound to accelerate the aerobic biodegradation of petroleum volatile organic compounds of interest. We switched from an alternative oxygen releasing product to EHC-O as the source of controlled-release oxygen because of its ability to buffer pH effects and provide inorganic nutrients that are important to the biodegradation processes."

Dr. Jim Mueller, president of AAI, observed that: "Data to-date were promising, but overall performance was less than desired by the client. The source area had already been removed and the plume had partly been treated with an alternative oxygen releasing product in October 2004. However, PVOCs were still detected at significant levels in downgradient monitoring wells during sampling events in February and May, 2005. Although there are other oxygen-releasing products available on the market, there were very significant technical and cost advantages associated with the use of EHC-O."

EHC-O is part of The Adventus Group's EHC(TM) brand umbrella, a family of latest generation bioremediation products used for the in situ treatment of groundwater and saturated soil impacted by heavy metals and persistent organic compounds such as chlorinated solvents, pesticides and energetics. The technology is a modification of their DARAMEND(R) technology, which has been successfully used since 1992 to treat more than 800,000 tons of similarly contaminated soil, sediment and solid wastes.

EHC-O(TM) is an integrated source of slow-release oxygen, major-, minor-, and micro-nutrients, and a pH buffering agent. This unique combination of materials facilitates the aerobic bioremediation of soils, sediment or groundwater environments impacted by various organic and inorganic compounds. For organic constituents amenable to aerobic biodegradation processes (e.g., petroleum hydrocarbons, certain pesticides/herbicides), EHC-O significantly stimulates the catabolic activity of the indigenous microflora, thereby accelerating the rate of contaminant removal.

The product is supplied in 30-pound pails as a powder, which can be mixed with soil or slurried in water. Installation techniques vary widely depending on the application. For example, the powder can be mixed with soil and placed at the bottom of an excavation where prior soil removal had been conducted. A slurry can be made and the mixture can be injected into the subsurface using techniques such as direct injection through Geoprobe rods or hydraulic fracturing. The powder is fine enough to permit injection of the slurry through well screens.

About STS Consultants

Headquartered in Vernon Hills, Ill., STS is an engineering consulting firm offering an integrated package of services in geotechnical engineering, civil engineering, transportation engineering, environmental management, and construction technology. STS has been a leader in providing environmental and engineering solutions for more than 50 years with more than 550 staff members in 18 offices. For more information, contact them online at www.stsconsultants.com

About The Adventus Group

Adventus Americas Inc. (AAI) is an environmental services company that provides various remediation biotechnologies including those exclusive to our sister companies, Adventus Remediation Technologies, Inc. (ART) and EnviroMetal Technologies, Inc. (ETI). The groups' proprietary technologies include DARAMEND(R) and TERRAMEND(TM) for treatment of soil and sediment, AQUAMEND(R) for wastewater, and EHC(TM) technologies and mGCW systems for in situ groundwater treatment. ETI is the world leader in applications of permeable reactive barrier (PRB) technology for the remediation of contaminated groundwater, with experience at over 125 sites in United States, Canada, Europe, Japan and Australia. Both EHC and DARAMEND are the subjects of numerous patents.

The Adventus network includes field offices in Colorado, Connecticut, Illinois, New Jersey, and Ontario, Canada, including an expanding network of international licensees. Licensee inquiries are welcome. For more information on The Adventus Group, call [phone] or visit the company's Web sites at www.adventus.us or http://www.eti.ca