A1. TechXtract® does not contain any RCRA characteristic hazardous materials such as chlorinated solvents or benzene. The spent solutions should be disposed of in accordance with local regulations. These secondary waste liquids will take on the characteristic of the contaminant that is removed. The TechXtract® formulations are industrial strength cleaners that should be handled carefully, per the directions on the Material Safety Data Sheets.

A2. Leach-back is the phenomena commonly called "wicking" or "capillary rise" by which liquids move through very small pores or capillaries using electrostatic charges. A candlewick is a common example.

A3. TechXtract®is different for the following reasons:

• TechXtract® is the only process successfully tested in the EPA's Superfund Innovative Technology Evaluation (S.I.T.E.) for the removal of sub-surface PCB contamination in concrete.
• TechXtract® is the only process to be awarded 7 U.S. and European Union patents.
• TechXtract® is the only process that removes electrostatically bonded contaminants.

A4. Individual production rates vary from project to project depending on a number of variables, including initial contaminant concentrations, the desired clean up concentration, and the age of the spill. The average TechXtract® project has produced 0.1 US gallons of waste liquid per square foot of area treated (.0378 liters / ft², 1.34liters / m2).

A5. A gallon of TechXtract®, if properly applied, covers 700 to 800 ft².

A6. Individual projects will have different requirements, however in the average project, a 3-man crew of two technicians and one working supervisor can complete one full cycle on 1800ft² per work day.

A.7. Each complete TechXtract® cycle removes 70% to 90% of the contaminant mass present. Knowing your initial contaminant concentration and the desired final concentration allows you to calculate the number of cycles. We also STRONGLY advise that the characterization sampling include core samples to determine the depth of contaminant penetration.