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eral Aviation Regulation Part 77, Objects Affecting Navigable Airspace, should be studied in the evalua- tion of alternate site locations. c. Environmental factors in the vicinity of pro- posed sites, including existing and proposed land uses, population densities, zoning, and conservation and recreation developments. d. Convenience of sites including study of pas- senger and employee Origination and Destination (O&D) surveys, computation of present and future average travel times and costs, and the effect popula- tion income groups will have on O&D surveys. e. Ground access modes to proposed sites includ- ing existing and proposed highway and rapid transit systems to population centers and possible V/STOL links to nearby airports. Passenger and employee O&D surveys should provide a basis for analyzing access facilities. f. Physical characteristics of alternative sites. The effect on site development costs of topography, soil conditions, drainage, natural resources, and climatic conditions should be analyzed. 30 g. Utility services to alternative sites. The avail- ability of major utilities such as electric, gas, water, and telephone should be compared as should the ability of each proposed site to accommodate utilities. The lead times required to extend utility plants in order to serve alternative sites should be considered. h. Land costs of alternate sites. This study should include the history of land values at proposed locations, current and forecast land values, and the impacts on costs of zoning for improved and unim- proved parcels. i. Cost comparisons of alternate sites. A quan- titative and qualitative comparison of the above factors should be made from the standpoint of cost. Quan- titative analysis should evaluate the costs of land acquisition and easements, site developments, major utilities, foundations, access facilities, ground travel to users, and effects on surrounding areas such as noise, air and water pollution, and safety. Qualitative evaluation should consider accessibility to users, com- patible land uses, expansion capabilities, and air traffic control compatibility.