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• Other Implementation Impacts includes consideration of initial (construction- <br /> related) remedial activities, long-term O&M activities, and groundwater <br /> monitoring activities, as applicable These effects would primarily relate to the <br /> ability to continue on-site business operations unhindered <br /> • Cost includes consideration of capital, O&M, and monitoring expenditures <br /> Because of the high variation between alternatives among these three cost <br /> categories, Net Present Worth (NPW) is the single best indicator that considers <br /> not only costs, but the length of time required to achieve the remedial objective, <br /> inflation, and the time value of money <br /> Each decision cntenon is assigned a weighting factor, which indicates the relative <br /> importance of the criterion in comparison to the others For this study, the sum of all the <br /> weighting factors is 100, as summarized in the following table <br /> rDecision Criterion Weighting <br /> Factor <br />' Effectiveness 8 <br /> • contaminant mass reduction <br /> • receptor isolation <br /> • beneficial land use <br /> Reliability 10 <br />' • potential for future groundwater impacts <br /> • long-term protection of human health <br /> • protection of other receptors <br /> Implementability <br /> • technical feasibility 12 <br /> • administrative feasibility 10 <br /> Safety 12 <br /> • to remediation workers <br /> • to AFPC workers <br /> • to general public <br /> i <br /> Other Implementation Impacts 8 <br /> • during remedial construction <br /> • during O&M <br /> • during monitoring <br /> Cost 40 <br /> • Net Present Worth <br /> TOTAL - ALL DECISION CRITERIA 100 <br /> SAC 127 10 22 <br /> I <br /> DAMES & MOORE <br />