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C:::J ,::> N -...l N ,;;.. Table ~. 1iJpical household unit for selected items: CAP and /ower mainstem. CAP Lower Item (Units) Mainstem (Units) Galvanized wa~ra Pipes 0.50 0.38 Toilet FluShi~ Mechanisms 1.60 1.61 Water Heate!,s 0.985 0.9~5 Dishwashers 0.20 0.25 Garbage Disposalsa 0.61 0.74 aMean values of survey data. b Census of Housing, 1970, U.S. Census Bureau (U,S. GPO, Washington, D.C., 1974). contained in Table 25 with the results reflecting expected costs per mg/l per household. Next, the cost per mg/I per household was capitalized over the 60'year period at 8 percent in order to estimate the corresponding annual costs. Tbese values are con. talned in Table 26 along with an estimate of number of hOU80hold units for tbe CAP and lower mainstem areas. The number of households for both areas is the annual equivalent amount of the present worth of households for the 6O.year period In question. Since costs are on an annual equivalent basis also, direct multiplication results il! total annual area damages per unit per mg/l shown in the last two columns of Table 26. Table ~6. Annual cost per household per mg/l TDS and total cost per mg/! TDS - Central ANona Project service area and /ower mainstem. Household Household CAP LMS Total Total Item Annual Annual Household Household Annual Annual Cost/mg/l Cost/mg/l Units Units Cost/mg/l Cost/mg/I CAP ($) LMS ($) CAP ($) LMS ($) 1. Galvanized Water Pipe Systems 0.0118 0.0089 245,000 250,100 2,891 2,226 2. Toilet Flushing Mechanisms 0.0064 0.0065 245,000 250,100 1,568 1,626 3. Water Heaters 0.0167 0.0167 245,000 250,100 4,092 4,177 4. Dishwashing Machines 0.0051 0.0064 245,000 250,100 1,250 1,601 5. Garbage Disposals 0.0058 0.0071 245,000 250.100 1,421 1,776 .