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habitat of the area, are obstructions to airport operations and must be cleared within the primary surface area and limited in height in the approach zones. ' A northwest southeast primary runway orientation is needed in order to achieve maximum wind coverage for a single runway facility with a maximum coverage of ' approximately 83.1% attained with alignment 14-32 in the Twin Cities area. In ' order to attain the desirable 95% wind coverage for the airport facility, a cross-wind runway is necessary which generally must be within 20 degrees of ' perpendicular (or at a right angle) to the primary runway. ' A. Primary Runway 13-31 and Crosswind Runway 4-22 ~ Schematic Airport Layout Plan #1, shown on Figure 3, utilizes a primary runway alignment of 13-31 and a crosswind runway alignment of 4-22. A wind coverage of approximately 83 percent is attained with Runway 13-31 and a combined runway wind coverage of nearly 96 percent is achieved by adding Runway 4-22. ' The southeast end of the primary surface for Primary Runway 13-31 has been ' located immediately above the embankment and 200 feet to the northwest of the floodway at the north end of Lake Itasca. As a result, most of the clear zone, ' zone A, and zone B areas for the southeast approach zone are located within the _ floodway or waters surface area of Lake Itasca. The existing ground elevation at the southeast end of the Runway 13-31 primary surface is approximately 898 which remains relatively constant in proceeding to the northwest until the midpoint. A swale at the point drops to elevation 870 before rising to the 890-900 elevations for the remainder of the primary surface 14