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' Corrective Action Plan Montgomery Ward Auto Service Center, Stockton, CA ■ Probability of Achieving Cleanup Goals (10) This criteria was assigned a weight ' of 10 because it is of prime importance to achieve cleanup goals ■ Ease of Implementation (5) This criteria was assigned a weight of 5 because ' although it is preferred to use a method relatively easy to implement, achieving the cleanup goal is more important ■ Space Availability (8) This criteria was assigned a weight of 8 because it is important to have the required aboveground space needed to implement a specific remedial alternative ' ■ Disruption to Facility Operations (4) This criteria was assigned a weight of 4 because although it is desirable not to have significant disruption to facility operations, that is not the main goal of the remediation project ' ■ Time of Completion (7) This criteria was assigned a weight of 7 because although the time required for achieving the specified cleanup goals is not crucial by itself, it is relatively important when considered in terms of the total costs over ' the length of time required ■ Cost of Implementation (8) This criteria was assigned a weight of 8 because the cost effectiveness of a specific remedial alternative is of prime importance ■ Corresponding Applicability (4) This criteria was assigned a weight of 4 because although it is desirable to use soil and ground water remedial techniques that work together, it is not a necessity or requirement For each remedial alternative evaluated, EAI then assigned a grade (0-10) against each of 1 the above criteria This grade, multiplied by the weight of the individual criteria would then yield a weighted score for that criteria as applicable to a specific remedial alternative The sum of the weighted scores for all the criteria for each remedial alternative will then ' provide a weighted score for that alternative that can be compared to other remedial alternatives ' 6.3 Soil Remediation Alternative Screening Soil remediation measures generally can be classified into in-situ and ex situ methods In- situ treatment methods include bioremediation/bioventing, vapor extraction, and soil washing, just to name a few Ex-situ methods include excavation and off-site disposal, and excavation and on-site treatment using various treatment methodologies Based on the information available to date, including the pilot study results, EAI considered the following options for remediating petroie m hydrocnrbon impacted soils at the Montgomery Ward Site e In-situ bioremediation ■ Ex-situ bioremediation ■ Ex-situ vapor cxu action ■ Excavation and off-site disposal ■ In-situ vapor extraction Project No 1232 - 12 - SAIL 12 -SAIL WORD 1232CAP