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1 <br />C <br />C <br />J <br />J <br />J <br />L <br />I . <br />detailed cost estimates have been developed for this alternative, property <br />owners would periodically incur costs for septic tank maintenance, <br />including pumpout, and possibly rehabilitation of their drainfields. We <br />would expect that, on a present worth basis, the cost of the no -action <br />alternative would probably be less than that of other alternatives. <br />However, the no -action alternative is expected to continue to cause <br />environmental degradation, especially of the aquifer and the Indian River. <br />Furthermore, the no -action alternative would conflict with the Indian River <br />County Area -Wide Master Plan which anticipates 90 percent discontinuation <br />of the use of septic tanks in the study area by the year 2000. On the <br />basis of environmental aspects, the no -action alternative is eliminated <br />from further consideration. <br />6.3 COST-EFFECTIVENESS ANALYSIS <br />A cost-effectiveness analysis of gravity versus pressure sewers was <br />conducted for the study areas. A GP system and a STEP system were used in <br />the analysis. <br />Several assumptions were made in the cost-effectiveness calculations, which <br />are shown in Table 6-1. A design life of 20 years was assumed for both <br />systems, with the grinder pump unit being replaced after 15 years. The <br />current EPA interest rate for economic analysis of 8-5/8 percent was used <br />in present worth calculations. Quantities for the sewers were obtained <br />from the sewer layouts shown in Figure 8-1 and unit costs were obtained <br />from detailed cost estimates for the proposed sewers. Since there were no <br />local data available for pressure sewers, quantities for components and <br />unit costs were obtained from the EPA publication, Alternatives for Small <br />Wastewater Treatment Systems. "Miscellaneous costs" for pressure sewers <br />were reduced to 10 percent since the cost for laterals was already item- <br />ized. All costs were updated to December 1986 using the Engineering <br />News -Record Construction Cost Index. The total figures do not include <br />contingencies, technical services and related costs, or inflation. The <br />IRC.VB4 <br />6/4/87 <br />6-3 <br />