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A.3 Social Structure Impacts There will not be any foreseen impacts on existing neighborhoods and communities or on employment. The project will not increase the maximum high water level in the reservoir. The project will allow the social structure in the area to remain intact by creating a safe environment surrounding the reservoir. Recreation uses for the reservoir will not be disturbed during the rehabilitation of the outlet works nor during the resolution of the spillway issues. B. Institutional Considerations The SEO will require that the project design be reviewed and accepted prior to construction. A list of permits, which may be required, is listed in the Institutional Considerations section of Chapter V. C. Comparative Evaluation The evaluation of alternatives were based on costs, technical merit, and preference of the South Side Reservoir Company since the above described evaluation factors are common to all alternatives considered for the project. A feasibility level probable cost estimate was developed for each of the alternatives. Major construction work items were identified and unit prices and quantities were estimated. The following assumptions were made: 1. Water level in the reservoir at the time of construction will not be inundating the existing outlet. This will be accomplished using cofferdams and temporary pumping. 2. The existing outlet works is founded on suitable material and foundations for any new structures can be located at similar elevations. Additional measures may be required if bedrock is deeper. 3. Mobilization/demobilization costs shown in the estimate is intended to cover the cost of mobilization and demobilization of equipment, temporary construction facilities, bonds and insurance. This cost item typically ranges from 5 to 15 percent of the total construction cost. The cost estimates were based on 10 percent. 21