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s <br /> j J <br /> do <br /> w <br /> Harding Lawson Associates <br /> accepted by many regulatory institutions. The stripping units <br /> are designed to accommodate both site-specific concentrations of <br /> hydrecarbon constituents and flow rates. <br /> On-site space would be required for water storage and <br /> ; ? treatment facilities. The treatment area could have to be <br /> secured by a fence. A health and safety .plan would be needed to <br /> '�--} .cover equipment operation and handling of contaminated water and <br /> } <br /> hydrocarbon-saturated <br /> ' � t h drocar-:bon-saturated carbon canisters: . A permit would f <br /> be <br /> required from the San Joaquin Air Pollution Control District <br /> (SJAPCD) to operate the air stripper. <br /> The drawbacks to this alternative are the large amounts <br /> k r of equipment and maintenance required. Th <br /> e <br /> e.qusj)ment.. is noisy <br /> P` and physically obtrusive. Because the site is at the. edge of 1 <br /> u . <br /> residential community, both of these factors make the ~alternative : <br /> . <br /> undesirable. Therefore, air stripping will not be given further i <br /> consideration. <br /> s <br /> Li aid- hese :ed <br /> -garb treatment This alterna- <br /> F five involves passing extracted ground water directly through. <br /> granular activated carbon, which adsorbs hydrocarbons. It is <br /> $ E necessary to monitor treated effluent water to evaluate <br /> dition of the carbon beds. If carbon contactors are operated in <br /> a series, only the first contactor would need to be monitored; ` <br /> jR when. breakthrough occurs, the second contactor would treat the <br /> R i <br /> 4' �r full load of water until- the carbon in the first contactor <br /> - was <br /> v �J <br /> replaced. Spent carbon can <br /> : 1 p p potentially be regenerated or dis- <br /> posed of at a class I landfill. <br /> f �f <br /> 6 <br /> L <br /> EMMOMMEMM <br />