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v x w y <br /> s <br /> 1 Harding Lawson Associates <br /> nants usually produces carbon dioxide, water, and nonhazardous <br /> j cellular constituents. <br /> Extracted ground water is introduced into a bioreactor <br /> containing microorganisms and nutrients. After a specified <br /> retention time (usually 8 to 12 hours) , the treated water is <br /> passed through a sand filter prior to discharge to remove excess <br /> 4 microorganisms. <br /> This alternative is a reliable, institutionally accept- <br /> able method that has been used at various locations for remedia- <br /> tion of hydrocarbons. An on-site treatment area would be <br /> j required to house the bioreactor and water storage equipment. <br /> i <br /> ' tat <br /> The treatment area would need to be secured by a fence. A health <br /> and safety plan would be needed for bioreactor operation and <br /> handling contaminated water. A Regional Water Quality Control <br /> Board (RWQCB) permit or variance would be required to implement <br /> this technology. <br /> Biological treatment requires large amounts of mechani- <br /> cal equipment and space. In addition, a treatability study would <br /> be required to define treatment processparameters. The treata- <br /> bility study and need fora permit or 'variance from the RWQCB <br /> r' k could cause a long delay before full-scale remediation could be <br /> } <br /> -instituted.--- This-alternative will-not be iven--further consider- <br /> t e3 <br /> ation. <br /> Oxidation by ultraviolet light '(UV1 and hydrogen Perox <br /> i _de zazl UV/H.0 oxidation .is a.process by which organic chem <br /> - <br /> 2 <br /> icals are converted to carbon dioxide and water: H2OZ is an <br /> a. <br /> �a <br /> 4 t4 8 - <br /> 'tet . <br /> don <br />