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REGENESIS 18) Repeat steps 13 through 23 until treatment of the entire contaminated vertical zone has been achieved. It is recommended that the procedure extend to the top of the capillary fringe/smear zone, or to the top of the targeted treatment interval. 19) Install an appropriate seal, such as bentonite, above the RegenOxTM material through the entire vadose zone. Prior to emplacing the borehole seal, we recommend placing clean sand in the hole to the top of the RegenOxTM treatment zone (especially important in holes that stay open). Bentonite chips or granular bentonite should be placed immediately above the treatment zone, followed by a cement/bentonite grout to roughly 0.5 feet below ground surface. Quick-set concrete should then be used as a surface seal. 20) Remove and clean the drive rods as necessary. 21) Finish the borehole at the surface as appropriate (concrete or asphalt cap, as needed). We recommend a quick set concrete to provide a good surface seal with minimal set up time. 22) A proper borehole and surface seal assures that the RegenOxTM remains properly placed and prevents contaminant migration from the subsurface. Each borehole should be sealed immediately following RegenOxTM application to minimize RegenOxTM surfacing during the injection process. If RegenOxTM continues to "surface" up the direct push borehole, an appropriately sized(oversized) disposable drive tip or wood plug/stake can be used to plug the hole until the aquifer pressures equilibrates and the RegenOxTM stops surfacing. If wells are used for RegenOxTM injection the RegenOxTM injection wells and all nearby groundwater monitoring wells should be tightly capped to reduce potential for surfacing through nearby wells. 23) Periodically compare the pre- and post-injection volumes of RegenOxTM in the holding tank or pump hopper using the pre-marked volume levels. Volume level may not be present on all tanks or pump hoppers. In this case, volume level markings can be temporarily added using known amounts of water and a carpenter's grease pencil (Kiel crayon). 24) Move to the next probe point, repeating steps 8 through 29. We recommend that the next RegenOxTM injection point be as far a distance as possible within the treatment zone from the previous RegenOxTM injection point. This will further minimize RegenOxTM surfacing and short circuiting up an adjacent borehole. When possible, due to the high volumes of liquid being injected, working from the outside of the injection area towards the center will limit expansion of the plume. RegenOx Direct-Push Step-by-Step I www.regenesis.com 1949-366-8000