Notes

Memorandum dated January 11, 2002, from Michael Bailey P.E. and Barry Chen P.E. of Hart Crowser, Inc. to Jim Thomson P.E. of HNTB Corporation, regarding geotechnical design parameters for Third Runway MSE (Mechanically Stabilized Earth) wall design at Sea-Tac Airport. Document AR 053235-053237 covers minimum factors of safety for static and seismic stability per 1996-2000 AASHTO code with interim addenda, comparing FHWA 1997, AASHTO 1996-2000, and RECo Design Manual 1999 criteria for sliding, overturning, bearing capacity, deep-seated stability, pullout resistance, and compound/global slope stability. References Embankment Technical Review Board (ETRB), reinforced soil slopes (RSS), pseudostatic Mononobe-Okabe analysis, and undrained/partially consolidated subgrade soil conditions.

Sidebar On/Off

As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

continue...

V V

Notes

Message