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rights-of-way. The projected water demands (in LUEs) were then a11ocated spatia11y to various demand locations in each of the three water pressure planes. (See Figure 1 of the letter report from Freese and Nichols, Inc.) The seventh step was the preparation of a prellminary facility design for the water system, with consideration given to cost-effectiveness and phasing of the facilities over the 20-year planning period. A computer-based water system model was used by Freese and Nichols, Inc. to determine the necessary minimum Hne sizes, we11 and pump capacities, ground and elevated storage capacities and their locations and to ensure safe operating pressures and flows throughout the system. The eighth and final step was the determination of cost estimates and the a11ocation of costs to the City and two proposed MUDs. Cost estimates were prepared based on unit costs for facility components in 1985 do11ars. Cont ingencies of 15% and engineering costs of 10% of construct ion were included. Cost shares for the City and the proposed MUDs were determined on a pro rata basis for each of the three planning periods, based on a series of formulas which are presented in the attached letter report. The total construct ion costs are presented in Table 4. Table 4. Estimated Total Construction Costs 1990 1995 2005 Total Rlvergate MUD 1,433,840 2, 144,540 4,111,340 7,689,720 Hlghrldge MUD 1,752,660 1,760,460 643,430 4,156,550 San Marcos 646,700 1,649,610 3,312,140 5,608,450 TOT AL 3,833,200 5,544,610 8,066,910 17,454,720 it A11 costs are jn 1985 do11ars