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.. .. <br /> MW <br /> Mss nsso IATES <br /> Gordon Boggs / 10 June 1988 / Page b <br /> i. <br /> o Controlled aeration by spreading the affected soll over an itnpermcablc liner <br /> and allowing natural processes of volitalization, biodegradation and photolysis <br /> to reduce the hydrocarbon concentrations in the soil. As discussed in <br /> Attachment ll, this is our recommended approach. <br /> o Disposal in approved landfills. This option would be very costly if any or the <br /> removed material requires disposal in a Class I hazardous landfill. It is also not <br /> a treatment for the afrected 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 /> o Enhanced biodegradation of the removed soil by promoting the growth of <br /> hydocarbon-utilizing microorganisms in the affected soil. This treatment option <br /> may be feasible and of moderate cost. <br /> r <br /> 2) in- i u Blod radatian <br /> This remedial option is generally feasible only for clean-up of ground water and <br /> ivity or naturally occurring <br /> saturated soil. In this process the growth and act <br /> microorganisms in the soil are stimulated by introducing nutrients. The microorganisms <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, imE.lr lentat'son and monitoring, world be <br /> very costly. <br />