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5 0 TECHNOLOGY SCREENING AND DEVELOPMENT OF REMEDIAL OPTIONS <br /> r <br /> This section presents the range of action and no-action alternatives applicable to remediating <br /> Y TPH concentrations above background levels in sods at the site The overall objective of this section <br /> are to develop action (and no-action) alternatives in sufficient detail to allow detailed cost and <br /> effectiveness evaluations to be performed in Section 6 0 This section reflects the improvement and <br /> developments of remedial technologies since the original feasibility study in 1988 Information <br /> regarding the extent of TPH impacts and the treatment of impacted site soils via ex-situ <br /> bioremediation and recent modeling efforts (Dames & Moore, 1994a) is also incorporated <br /> 5 1 GENERAL RESPONSE ACTIONS <br /> General response actions are broad categories of methods potentially applicable to address <br /> impacted media Four general response actions are considered for evaluation to address the impacted <br /> soil identified at the AFPC site no-action, limited action, in-situ treatment, and ex-situ treatment/ <br /> disposal These general response actions are briefly defined below <br /> No-Action <br /> The no-action general response action is defined as taking no active steps to change current <br /> site conditions It typically does not include monitoring or maintaining existing conditions The no- <br /> action general response action is included in the evaluation process for two reasons it is a baseline <br /> for comparison of alternatives, and it may be selected as the preferred alternative if impacts are <br /> minimal or other cost-effective, technically feasible alternatives are unavailable <br /> Limited Action <br /> Limited action generally consists of few active steps to remove or destroy contaminants The <br /> typical approach is to control risk to human health and the environment by limiting exposure to the <br /> constituents of concern In the case of soil impacts, exposure can be controlled through one or more <br /> of the following measures <br /> • Site access restriction (fencing or security teams), <br /> • Deed or zoning restrictions to prevent land uses which might move the <br /> contaminants from their current location or result in unintended exposure to <br /> receptors, and <br /> SAC127 10 8 <br /> DAMES & MOORE <br />