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plan also recommended a 1,000-foot extension to Runway 3/21. This extension would provide the airport with increased ability to handle a greater percentage of the general aviation operating fleet at increased useful loads. A comprehensive development plan is currently underway at Lake Elmo. An environmental assessment will probably be required before the runway can be extended. In 1976, the cost of this runway anti taxiway extension was estimated at 5324,000. Inflated to 1989 dollars, the cost of this 1,000-foot , extension is estimated at 5691,000. Therefore, the cost of Alternative 2 is estimated at 5691,000. (3) etternative 3 -Construct Pazallel Runway at Anoka Countv-Blaine Alternative 3 improves system capacity by providing Anoka County-Blaine Airport with a pazallel runway (17R/35L). The existing comprehensive development plan recommends that this pazallel rtmway have a length of 4,855 feet. The FAA and MAC both agree that an air traffic control tower would be needed to ensure the safe operation of pazaliel runways at Anoka County-Blaine. These improvements will increase the airport's operational capacity from an estimated 230,000 to 355,000 annual operations. Anoka County-Blaine is the only existing airport in the reliever system where major improvements can be made to significantly improve operational capaaty. Alternative 3 does not provide for diversion between reliever airports. Alternative 3 is illustrated in E:htbit IV-6. 1. System Diversion No diversion occurs in Alternative 3. 2. Operational Demand By increasing the ASV at Anoka County-Blaine to 355,000 annual operations, the airport will approach 89 percent of its enhanced operational capaaty in 2008. The relationship between demand and capacity at each of the other reliever airports is consistent with the relationships provided for in Alternative 1. IV-24