4.4.2.7 Cost -- Alternative 2 The total capital and O&M costs, and NPV for dechlorination and HTTD treatment are shown in Table 4-8 and detailed in Appendix C. Total fixed costs are $1,260,000. The annual O&M costs are $8,960,000. The NPV has been estimated for Scenario 1 and 2 for a period of 6 and 9 years, respectively, discounted at a rate of 7.5 percent. The NPV of all costs for Alternative 2 including material handling costs and treatment and disposal costs is $130,000,000 and $159,000,000 for Scenario 1 and 2, respectively.