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3.10.8 Potential Effect: The 151 foot high building could have a deleterious effect on <br /> the operation of an air navigation facility (the San Carlos Tower) in that it could <br /> severely restrict the minimum altitude for aircraft descending on a short base to <br /> final approach to Runway 12 over the proposed building. <br /> <br /> Findings: The GID hereby makes finding (1). <br /> <br /> Facts in Support of Findings: <br /> <br /> (a) Aircraft executing a base to fmal approach to Runway 12 from the vicinity <br /> of the KNBR tower would be at altitudes of approximately 300 to 360 feet MSL <br /> as they pass over the site of the 10-story building. Therefore, the minimum <br /> clearance over the top of the building would be approximately 150 feet. <br /> <br /> (b) Aircraft on such an approach to Runway 12 would fly much closer to the <br /> top of the existing Paragon building (approximately 130 feet). Moreover, if 150 <br /> feet clearance were required over the top of any building in the San Carlos Class D <br /> airspace, the 222-foot high Oracle building would be the controlling object. <br /> <br /> (c) At least three existing buildings in the immediate vicinity of the Project <br /> would require that altitudes in excess of 300 feet MSL be maintained ifa <br /> descending aircraft is to maintain 150 feet of clearance over these buildings on <br /> approach to Runway 12. To clear the DHL building by 150 feet, an aircraft <br /> would have to be at an altitude of about 316 feet MSL as it passed by the Project <br /> site. To clear the Provident building by 150 feet, the aircraft would have to be at <br /> an altitude of 308 feet MSL as it passed by the Project site. In order to achieve a <br /> 150-foot clearance over the Paragon building, which is in direct alignment with the <br /> EA building on the short base to final approach to Runway 12, an aircraft would <br /> have to pass over the 10-story building at an altitude of about 325 feet MSL. <br /> <br /> (d) Flight track and altitude data derived from the San Francisco International <br /> Airport PASSUR system do not support the contention that aircraft operate at <br /> altitudes as low as 150 to 200 feet MSL in the vicinity of the 10-story building <br /> when making a short base to final approach to Runway 12 under SVFR <br /> conditions. No operations conducted in the vicinity oftbe Project site were at <br /> altitudes of less than 300 feet during the periods surveyed, which included severe <br /> winter conditions. <br /> <br /> -26- <br />GIDEIRFD.DOC <br />70.3/96 5:44 PM <br /> <br /> <br />