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The Tank Integrity Aa »nce Program is summarized on the Decision Flow <br /> Diagram in Appendix C. We wish to emphasize our recommendation for good <br /> planning. With proper attention to construction staging and coordination at <br /> each site, considerable monies can be saved. <br /> 5.0 EC ONO MICS <br /> Cathodic protection is the only effective and economical means of corrosion <br /> control for existing underground steel tank systems. Once the leak <br /> verification, inventory analysis, etc. is completed, a cathodic protection <br /> system should be included in the tank Integrity Affiance Program for all <br /> tanks which are to be maintained. The installation of cathodic protection <br /> should also be coordinated with other planned activities at the site, such as <br /> leak monitoring and inventory control systems. <br /> Appendix D contains present worth calculations for various ccrrosiron control <br /> options which include retrofitting with cathodic protection; replacing with <br /> steel tanks and cathodic protection; replacing with double wall tanks; and <br /> lining with fa>erglass, replacing PipuxJ and retrofitting with cathodic <br /> protection. These calculations are Fused upon a 10% cast of money, 4% rate <br /> of inflation, power casts of 7 cents/K W H and cathodic protection power <br /> requirements of 150 watts DC. The application of cathodic protection to <br /> eiSting tanks, where the systems are presently tight, is clearly the most <br /> economical alternative. <br />