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A rating system has been developed for each decision criterion to assign a numencal score to each remedial option based on its ability to satisfy the cntenon Where practical, the rating system is based on quantifiable values, such as percent of contaminant destroyed or removed However, when this is not practical, the options are ranked by companng them to one another The following table summanzes the rating system developed for the remedial action decision cntena for the AFPC site, including the method by which rating points are assigned to the remedial options Decision Criteria Scoring Assignment (points) 2 4 6 8 10 Effectiveness Poor Fair Moderate Good Excellent Reliability Poor Fair Moderate Good Excellent ' Implementability Poor Fair Moderate Good Excellent *Technical Feasibility *Administrative Feasibility Safety Poor Fair Moderate Good Excellent Other Implementation Impacts Poor Fair Moderate Good I Excellent Cost Simple ranking system (lowest Net Present Worth = 10, next lowest = 9, etc ) Using the weighting and scoring system described above, the overall point score for each remedial option was determined by multiplying the raw score for each decision cntenon by its weighting factor to obtain the weighted score The sum of the weighted scores for a given option is the overall point score for that option The option with the highest point score is the preferred remedial option, the option with the second highest point score is the second most preferred option, and so on 1 6 2 REMEDIAL OPTION COST ESTIMATES AND NET PRESENT WORTH 1 Predesign level engineer's cost estimates were developed for each of the nine options based on the description of remedial construction, O&M, and monitoring presented in Section 4 4 The cost estimates are presented in Appendix B SAc127 10 23 DAMES 8,_MOORE