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1 <br /> �DYQ� <br /> CLEAATERR�V <br />' G R O U P <br /> Environmental Services <br />' Enhanced bioremediation by the use of injected dissolved oxygen has been proven to be an <br /> effective technology for degradation of dissolved and sorbed-phase hydrocarbons However <br /> Imany groundwater environments that are high in ferrous iron and BOD, for example, will <br /> consume large volumes of injected dissolved oxygen before aerobic bacteria can utilize the <br />' oxygen as part of the process of hydrocarbon degradation Thus, delivery of dissolved oxygen at <br /> sufficient concentrations is essential to off-set potential chemical and biological oxygen <br />' consumption <br />' 6.4 Overview of iSOC Technology <br /> A growing number of remediation contractors in the US, Canada and Brazil are utilizing a <br />' Canadian technology called in-situ Submerged Oxygen Curtain (iSOC) which infuses oxygen <br /> gas, using a spargeless technique, into groundwater in the dissolved phase The proprietary <br /> structured polymer used in the iSOC unit provides large surface area for gas transfer, and is <br />' housed within a 15 inch by 175 inch stainless steel casing which is placed down a 2 or 4-inch <br /> monitor well The device is connected to a regulated supply of industrial compressed oxygen, <br />' which is stored inside a secured remediation compound The rate of 02 infusion is typically in <br /> the range of 15 to 20 cubic centimeters per minute Resultant dissolved oxygen (DO) <br />' concentrations in the range of 40 to 50 mg/L may be achieved The effective radius of influence <br /> of a typical injection well equipped with iSOC is 10 to 15 feet Illustrations of equipment and a <br />' typical setup are shown in Appendix D Oxygen enrichment is achieved without causing aeration <br /> or volatilization of organic compounds The technology requires no external power sources, <br />' generates no noise, vibrations, or remediation wastes, and is installed with minimal disruptions to <br /> the site Only periodic exchange of oxygen canisters and groundwater sampling are required <br />' after installation of system components <br /> ZB178C RAP 20 May 18,2004 <br />