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compared to timber and steel piles that car, be installed for 516.00 and 526.00 per linear foot,
respectively.
Specific design and construction recommendations are presented in Sections 4 and 5,
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3.4 FLOORS
} Based on our March 13 meeting with the design team, it was concluded that a concrete slab -on -
grade floor system would not be appropriate for this site given that settlement sensitive floor `
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coverings (such as marble) would be incorporated into the project. Consequently, a structural
slab supported by grade beams is appropriate for this site. We also recommend underslab
r drainage measures, such as a capillary break, be included in the design.
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Positive drainage of seepage beneath the floor slab should be prodded. Seepage water should be
routed away from the building into a storm drain.
3.5 SEISNHC CONSIDERATIONS
Historically, the Puget Sound region has been subjected to fiegl4,.rnt earthquakes of moderate
intensity. Consequently, the region is described in the Uniform Building Code (LBC) as Seismic
y Zone 3. Two earthquakes that resulted in significant damage occurred in 1949 near Olympia and
in 1965 near Seattle. The April 13, 1949 earthquake is the largest recorded earthquake in the
region, reaching a magnitude of ? 1 on the Richter scale. It was felt over 150,000 square miles,
and resulted in eight deaths and many injuries. More recently, the February 28, 2001 earthquake
is the second largest recorded earthquake with a magnitude of 6.8. This earthquake was felt over
a 150,000 square miles. The April 29, 1965 earthquake of magnitude 6.5 was felt over 130,000
square miles and resulted in widespread damage in the Seattle area. Ground failures attributed to
liquefaction occurred in many waterfront areas, including sand boils on the Boeing property near
the site. A large landslide caused by earthquake temporarily blocked the Cedar River a few miles
from the site.
Based on seismic risk analyses we have performed for similar sites in the Puget Sound region,
` we believe peak ground accelerations at the Fry's Superstore site in Renton, Washington would
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