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•z: _ »„may^ .� r� <br /> F <br /> Harding Lawson Associates <br /> oxidizer that, when mixed with contaminated water and exposed to <br /> i <br /> ' JV light, produces hydroxyl radicals. These react with the <br /> am <br /> organic compounds in gasoline to form carbon dioxide and water. <br /> UV/HO, is a rather new technology that has only occa- <br /> sionally been implemented as part of a remedial action plan. It <br /> cannot be considered reliable or institutionally acceptable at <br /> this time. A pilot study would be re <br /> . quirpd to determii,;a flow <br /> CA rates. and final design, Because the number of other proven <br /> treatment alternatives available for this site, we have decided <br /> that this alternative will not .be given further consideration. <br /> Phsical_containment - This alternative would involve <br /> 4: installing a barrier such as a slurry cut-off wall that would <br /> E restrict affected water from moving downgradient and divsrt non- <br /> IMF <br /> 1 <br /> contaminated water. Physical containment could becombined with <br /> water extraction. A monitoring system would be required to <br /> ensure the effectiveness of containment. <br /> A slurry wall is constructed through the <br /> g permeable <br /> fk zones ;gin which ground water is flowing and into an underlying <br /> zone of low permeability. The wall usually consists of a soil/ <br /> bentonite or soil/cement mixture that encircles and isolates the <br /> zone of contaminated ground water. Slurry wall technology has <br /> been proven :reliable and is accepted as a remedial scheme where. <br /> r = . <br /> site lithology. is suitable. Ground-water monitoring downgradient <br /> of the slurry mall is Usually required to demonstrate the .wall's <br /> a , effectiveness. <br /> W. <br /> 9 <br /> { _ <br /> c <br /> .i�zY..S....Y-nF.4 �.... ..s. -. !-:...... .-. <br />