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Search Area "A" would not experience significant operational delay because a limited number of based aircraft is projected for the facility by the end of the planning period (see Table N-11). It is important to note that the average delay and number of operations for the new general aviation airport in Seazch Area "A" were calculated based on diversion only from Anoka County-Blaine. Depending on the actual location of the new airport, based aircraft operations could also be attracted from other reliever system airports. 4. Preliminary System Cost Preliminary development rnsts for Alternative 4 and 6 were combined to reach an estimated cost of 510,345,000 for Alternative 8. Alternative 8 includes as estimated cost of 5691,000 fora 1,000-foot long runway extension at Lake Elmo, 5354;000 for a pazallel nmway and taxiway and air traffic control tower at Anoka County-Blaine, and 56,200,000 for a new general aviation airport in Seazch Area "A." Cost estimates for a runway extension at Lake Elmo, which were inflated from the 1976 master plan, aze based on as ultimate length of 3,500 feet. A comprehensive development plan update would be required to assess all of these recommendations. 3, FVAi__UATION OF ALTERNATIVES The eight alternatives developed to resolve existing and future capacity deficiencies in the reliever airport system were evaluated on six criterion: System capacity and delay Development costs Environmental impacts User convenience Long-term system flexibility Implementation feasibility Alternatives were analyzed in terms of their ability to satisfy these six evaluation criterion and rated on a scale of 1 to 5,1 being low and 5 being high. For example, if an alternative requires actions that may adversely impact ground water or requires the relocation of homes or businesses, a lower value is assigned to environmental impacts. An alternative that does not require relocation or have other negative consequences would receive a higher rating. N-47