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_ -`'-,-z MglM-11 <br /> RIMER <br /> Mug <br /> i HardSng Lawson Associates <br /> 2. Treatment Alternatives <br /> i <br /> Aeration - Two methods of aeration can be considered: <br /> i <br /> open-air aeration and a closed method. The conventional approach <br /> to aeration involves spreading and periodically turninc, ze jls to <br /> f <br /> �,. <br /> allow gasoline hydrocarbons to volatilize directly in the <br /> ;. <br /> atmosphere. The second method involves heaping soils over per <br /> i � forated 'pipe(s) and drawing a vacuum .through the pile. The with- <br /> r-r: . drawn gases can be directed to .a carbon treatment unit prior to <br /> � t - <br /> venting to the atmosphere, or vented directly to the atmosphere. <br /> . ; Once soils have been successfully aerated, they can be used to. <br /> r backfill excavated' areas or may be da.s posed of off site at a <br /> Class II landfill. <br /> Aeration is a well established technique for remediat-• E <br /> + ' ing soils with.deteatable concentrations of gasoline hydrocar- <br /> bons. It has been used at many sites with similar conditions. <br /> i <br /> t <br /> Standard construction equipment is used to turn the soils;. peri- f <br /> y odically, soil samples are collected to check the effectiveness <br /> of the process. <br /> The rateof aeration is dictated by the original levels <br /> 5 ! ..Of TPH in the soils and ambient weather conditions. Approval <br /> from the.SJAPCD is required. This agency has. recently amended <br /> "its rules and we understand. that.open aeration within the county <br /> will be prohibited. Air containing- gasoline constituents from <br /> fa <br /> aeration would have to be collected and treated prior to its <br /> N <br /> release to the atmosphere. The new regulations go into effect <br /> �." July .1, 1.5,89. <br /> z <br /> - !.-` - - - <br /> 15 <br />