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i <br />__._-. _-..._... __ ........_._...�.,......- ,. �..-.-................._. _..w.........-....._.._.........,---, .......»_.+.,,._.._....._.. ..... WE7$$/1$SOCIATEJ''-IIII �6) ■ <br /> Gordon Boggs / 10 June 1988 / Page 6 <br /> o Controlled acrafiori,`by spreading the affected soil over an impermeable liner <br /> and allowing natural nracesses Qf volitalization, biodegradation and photolysis <br /> to reduce the hydrocarbon concentrations in the soil, As discussed in <br /> Attachment B, this is our recommended approach. <br /> i <br /> o Disposal in approved pproved landfills. This option would be very costly if any of the <br /> removed material requires disposal in a Class I hazardous landfill. It is also not } <br /> a treatment for the affected soils and does not reduce liability for the <br /> generator. <br /> o Forced steam injection to thermally degrade and volatilize the hydrocarbons <br /> with concurrent liquid and vapor capture and treatment, This option may be <br /> effective but has expensive design, equipment, operation,- monitoring and <br /> disposal requirements. <br /> o Thermal treatment by exposing the .affected soil to excessive heat in an <br /> incinerator, This option may not be feasible due to very high cost. and/or the <br /> permitting requirements and availability of a portable, onsite incinerator, <br /> i <br /> a Lnhaneed bladegra,dation of tlii, re,1116 'd 3i�i1 l,y Nivuivtia125 flit ISIvwCl► of <br /> hydocarbon-utilizing microorganisms in the affected soil. This treatment option <br /> may be feasible and of moderate cost. <br /> 2) !R:JiLtR Biodegradation <br /> This remedial option i8 <br /> p generally faaeibl® only for ocean up of ground tvntor and <br /> saturated soil. In this process the growth and activity of naturally occurring <br /> microorganisms in the soil are stimulated by introducing nutrients. Them'seroorganisms <br /> then multiply and degrade the hydrocarbons in the affected soil. Since the process <br /> requires saturated soil conditions, the ground water table in the vicinity of the excavation <br /> would need to be elevated over the level of the affected soils for this treatment to be <br /> effective. In addition, biodegradation can take up to several years for complete clean-up, <br /> and, because it requires very careful design, implementation and monitoring, would be <br /> very costly. <br /> ' f <br />