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71, <br /> L <br /> Harding Lawson Associates <br /> This alternative has been used extensively at Fites <br /> where ground water contains <br /> gasoline hydrocarbons. The carbon <br /> contactors are designed and sized to be site-specific; hence, <br /> they are operated at maximum efficiency. on-site space would <br /> have to be made available for water storage and treatment <br /> facili- <br /> ties. The treatment area would have to be secured with fencing. <br /> A health and safety plan would have to be <br /> prepared to cover <br /> i L.. <br /> equipment operation, as well .as handling contaminated water and <br /> spent carbon. No permits are required to operate such a treat- <br /> ment system. <br /> As wi4h air stripping, liquid- <br /> phase activated carbon <br /> treatment involves a large amount- of equipment; however, it is <br /> nr}ether as noticeable nor as noisy. SWoIild :suffc�'an 'quantties <br /> of water be generated durang ground water remediatioo;`justifv... <br /> on site treatment, ,thas alternative would T�e' veryattractave <br /> c Accordin Y" thfs alternative 'wfll be iven further Si <br /> 5 Y, <br /> = Bolo 'ca treatment - Biological treatment consists of <br /> removing organic contaminants from ground water through enhancing <br /> of indigenous microorganisms that metabolize organic contami <br /> - - -- - <br /> pants. Nutrients such as nitrogen, <br /> phosphorum, and oxygen are <br /> y 7 <br /> added to contaminated' ground water in a surface bioreactor. .. <br /> These :nutrients accelerate the rate of biolcgical degradation of <br /> ` 4 _ - - -_ <br /> '' organic contaminants, including those in gasolinesuch as ben- <br /> { � L zene toluene, and. x lepra. <br /> Y Biodegradation of organic contami- <br /> �� 7 <br />