Contaminants treated include: Petroleum hydrocarbons, including MTBE Floating products, such as fuels. Halogenated hydrocarbons, such as the solvents TCE, PCE, and vinyl chloride Other solvents and volatile organic compounds Semi-volatile organic compounds. Any compound that is effectively removed from water by carbon adsorption Many metals, such as lead, uranium, and mercury Arsenic and other inorganic contaminants that can be either adsorbed or removed by a reactive medium (e.g., reduction or precipitation)

was formed in 1997 to offer cost-effective groundwater remediation systems using in-situ remediation technologies.

We work primarily with re-circulating well technologies, which remove contaminants within wells. With such technologies, the water is never brought aboveground, but remains in the aquifer.

Six technologies are used to remove the contaminants from the water:

• With Density Driven Convection (DDC) technology, the contaminants are stripped from the water by air sparging within the well; the water is pumped through the well by air-lift pumping.
• With In-Situ Groundwater Remediation (ISGR) technology, the contaminants are removed by adsorption onto granular activated carbon or other adsorptive treatment medium, or by treatment with a reactive medium.
• With Floating Product Removal (FPR) technology, a skimmer pump is incorporated in a specially designed ISGR well to remove the floating product at the same time the groundwater is treated for dissolved contaminants.
• With Blowerless Air Sparging (BAS) technology, air is forced out of a recirculating well into the aquifer, as in traditional air sparging. BAS technology uses a recirculating well and no blower, compressor, or air pump in moving the air down the well and out into the aquifer.
• With Blowerless In-Well Stripping (BIWS) technology, the water is stripped of contaminants as it passes through a recirculating well, as with traditional in-well stripping technology. BIWS technology uses no blower, compressor, or air pump in stripping the water within the well.
• With Dissolved Oxygen Enhancement (DOE) technology, the water is saturated with dissolved oxygen as it passes through a recirculating well. As with BAS and BIWS technologies, DOE technology uses no blower, compressor, or air pump in saturating the water with oxygen within the well

DDC technology and ISGR technology are patented. FPR, BAS, BIWS, and DOE technologies are patent-pending.

There are many advantages to recirculating well technologies; the advantages are provided elsewhere on this web page.

Contaminants treated include:

• Petroleum hydrocarbons, including MTBE and TBA
• Floating products, such as fuels
• Halogenated hydrocarbons, such as the solvents TCE, PCE, and vinyl chloride
• Other solvents and volatile organic compounds
• Semi-volatile organic compounds
• Any compound that is effectively removed from water by carbon adsorption
• Many metals, such as lead, uranium, and mercury
• Arsenic and other inorganic contaminants that can be either adsorbed or removed by a reactive medium (e.g., ion-exchange resin)

Given an aquifer, confined or unconfined, that produces at least one tenth gallon per minute, a recirculating well treatment system can generally be developed for a site. However, no technology solves every problem, and there are limitations that must be borne in mind when applying these technologies.

We can provide complete systems, including all drilling, mechanical systems, air pollution abatement (if required), and controls. Typically, we assume all responsibility for successful installation and provide a turnkey system. Mechanical systems, including blower systems, down-well components, and controls are provided on a direct sale or lease basis.

If you would like to consider recirculating well technology for a site, just fill in the Design Data Form and fax or mail it to us, or fill out the form on line and e-mail it to us. It is not necessary to have all of the information requested on the form; some information can be estimated, or replaced with an assumed value. We will provide a conceptual design and budget-level cost estimate, typically within one week.

is incorporated in the state of Oregon. We have completed projects ranging from just over $100,000 to $1,500,000. Our insurance limits are up to $1,000,000 per occurrence. We have bonded projects up to $1,500,000. Our Dunn & Bradstreet number is 00-818-5725.

2851 NW 9th Street
Corvallis, Oregon 97330
541-757-7700
541-757-7706 (fax))
e-mail: technicalagwr.com