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3. INVENTORY PROCESS <br />Four methods were used to gather inventory data: review of existing studies, <br />distribution of inventory data forms, oa-site visits, and surveys. This combination of methods <br />was necessary due to the diversity of the data required for the Regional System Reliever <br />Airports Study. Existing studies and inventory data forms were used to gather initial data, <br />and the on-site visits were conducted to confirm and expand the data base. Surveys, which <br />were conducted to generate information on the opinions and recommendations of the <br />aviation system users, provided further study input and data. <br />(1) 'sting Studies <br />Appendix A lists the existing studies reviewed as part of the Regional System <br />Reliever Airports Study. The existing studies provided important historical data, <br />serving as a basis from which to begin the study's inventory efforts. The studies <br />reviewed included mastec plans for many of the system airports. Although some of [~ <br />the plans were outdated, a number were very recent or were in the process of being <br />updated. <br />(2) Inventory Data Forms <br />Fn the first phase of analyzing the existing aviation system, a list of primary <br />airports to be inventoried was identified. A secondary list was generated to show <br />future facilities or other facilities available for consideration as they relate to the <br />Minneapolis-St. Paul reliever system. These lists were provided by the Metropolitan <br />Council to define the parameters of the Regional System Reliever Airports Study. <br />Preliminary inventory data were secured through a number of sources, <br />including FAA sectional charts, aviation directories, and FAA 5010 forms. Each <br />airport manager on the Council's inventory list was sent a completed or partially <br />completed data form (see Appendix B) and was asked to provide any missing data [~ <br />I-27 <br />