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'✓ Page 2 of 3 dissolved-phase contamination will be reduced initially, but will then rebound somewhat in most cases, as the sorbed contaminants become redissolved. It is therefore critically important to accurately estimate the mass of soil-bound contaminant within the subsurface and to anticipate and allow for this predictable rebound in dissolved-phase contaminants after the initi4l injection. It is for this reason that Regenesis strongly recommends the use of a series ofsix RegenOx injections performed 1 to 2 weeks apart. As with any other remediation technology, chemical oxidation projects often reach asymptotic performance conditions. Therefore, a realistic set of goals should be established before the project is started. In many cases a cost-effective treatment strategy includes the recommended number of RegenOx injections to rapidly reduce contaminant mass at the site, followed by application of a slow-release bioremediation amendment such as Oxygen Release Compound Advanced (ORC-A®) or Hydrogen Release Compound (HRC®). As noted earlier, this approach 1 assures continued long-term treatment of remaining contaminants through low-cost bioremediation after the chemical oxidation treatment is complete. Preliminary Aquifer Volume Testing Prior to application of the RegenOx material, it is critical that a clear water injection be performed at the site. The injection a non-reactive (clear water) material at a volume that is approximately 25% greater than the anticipated application volume of RegenOx will provide good evidence of the aquifers capacity to accept the designed volume of RegenOx. Please note, the preliminary aquifer volume test should be conducted outside of the desired on-site treatment area(s) in order to avoid overloading the subsurface with clear-water before applying RegenOx on-site. Performance Expectations Site Characterization This design/proposal is based upon site characteristics and professional opinions provided by your company. It is your responsibility to ensure that the site characteristics provided to Regenesis and subsequently used in this design are representative of actual site characteristics. Actual site characteristics e.g. identification of the appropriate vertical treatment zone, that vary from those provided for this design may directly affect the overall performance of the project. Subsurface Product Delivery Product delivery during application is of the highest importance in ensuring project success. Attention must be given to both horizontal and vertical placement of the product. The professional judgment of your associates should be used to identify the appropriate treatment zone (vertical and lateral). The identified treatment zone should consider the distribution of the targeted contaminant as well as variations in subsurface permeability that might preferentially channel the product during application. Finally, it is the responsibility your company to ensure that the field delivery methods used by the applier actually deliver the product into the identified treatment zone. Project Responsibility