EXH1238049975

TO:. Mr. Jim Thomson, P.E.,HNTB Corporation Boston FROM: Michael Bailey,P.E.,Hart Crowser, Inc_ RE: Post-EarthquakeReconnaissance and Photo Documentation STIA Third Runway Project Ch,cago J-4978-06 Denver "_ This memo and accompanying figures and photographs document observations by Hart Crowser on two occasionsfollowing the February 28, 2001, Nisqually earthquake. Two Hart Crowser engineers (myself and Doug Lindquist)accomplished an initial Fairb&nks reconnaissanceon March I, lessthan 24 hours after the earthquake. The initial reconnaissanceincluded the toe of existing embankment fill constructed in 2000 and 2001, and areas along the toe of the proposed embankment and at the location of the proposed West and North MSE walls. A Hart Crowser geologist,Derek Ormerod, accomplished a second reconnaissance on March 2, which covered the same areas and specifically added JerseyCity portions of the fill constructed in 1998 and 1999. Mr. Ormerod obtained photographic documentation of the observed conditions usingboth digital and film images. Hart Crowser's observationswere specifically intended to identify any areas of instability, Juneau including potential for: sloughingor bulges of the embankment, heave of the native ground surfaceadjacent to the fill, tension cracks, and liquefaction or evidence of lateral spreading. No evidence of any ground movement, liquefaction, or deformation of any kind related to the earthquake was observed. Our observations indicate the embankment performed well Long Beach in the earthquake, includingthose limited areas where previous surficial sloughs or erosion features had occurred at the time of construction. With respect to liquefaction, our reconnaissancespecifically included those areas of the proposed future embankment where prior geotechnical investigationsand analyseshad Portland…

Open full document

Upcoming Events

PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]