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84. Year Total Estimated Annual Cost Cost Per MG- 1950 $316,100 $ 81.50^ 1958 452,100 ,77.10 | 1960 689,500 110.00 1970 880,300 9i.io / 1980 892,900 81.50 J The total annual costs given above were computed on the following bases: (1) Annual payments on first cost both for construc­tion and for acquiring water properties. Bonds bearing 5% interest, retiring serially over a 30-year period. This results in an annual pay­ment of 5.102$ of the first cost. (2) Maintenance Pipe Lines - Inspection - $1,000 per year Repairs - 0.1$ of first cost per year Electrical Controls - 5$ of first cost per year Pumps - 3$ of first cost per year Structures - 1$ of first cost per year Reservoirs - 0.5$ of first cost per year Distribution System (of Water Co.) - For 1950 same as given in 1948 Annual Report ($18,600; increasing to $37,200 by the year 1990. (3) Operation. Assuming remote control of booster stations, partial attendance at well field, and full time attendance at installation at Oakey and Sixth, the following labor is necessary: Well Field . . . 2 ^ $2,400 $ 4,800 per yr. Lake Mead System 5 fL $2,400 12,000 per yr. Technical Superintendance 6.000 per yr. Total Labor . . $22,800