July/August 2024 - 91

CSM panel installation
Building
the Deepest
Basement
in Downtown
San Jose
FEATURE ARTICLE
The project site is located within a
portion of a downtown city block and
has maximum plan dimensions of
about 270 by 220 ft (83 by 67 m) and
encompasses about 1.7 acres (0.7 ha).
Prior to construction, the site was
occupied by an at-grade office building,
a parking garage with partial basement
and a paved parking lot.
The development has recently been
completed and comprises a 19-story
office tower with four levels of belowgrade
parking. The basement construction
required a 54-58 ft (16-18 m) deep
excavation that occupies the entire
footprint of the site. The shoring system
installation began in December 2019
and mass excavation was completed in
September 2020. The construction of
the office tower was completed during
the summer of 2022.
Subsurface Conditions
San Francisco Bay Area
The 200 Park Avenue project is located
in the San Francisco Bay Area in the
Santa Clara Valley. The Santa Clara
Valley is situated at the base of two
mountain ranges consisting of the
Santa Cruz Mountains on the west and
the Diablo Range on the east. More
specifically, the project is in downtown
San Jose, which was formerly utilized
for agricultural production until the
technology industry rapidly grew in the
20th century. As a result, downtown
San Jose quickly transitioned into a
metropolitan area.
Rob Jameson and Ryan Nagle, Malcolm Drilling Company
LANGAN Engineering and Environmental
Services, as the geotechnical
engineer, performed a geotechnical
investigation at the site in 2019 to
supplement the available data. The
field exploration consisted of four
borings using a truck-mounted drill rig
with rotary wash drilling equipment
and seven cone penetration tests (CPTs).
The maximum depth explored at the
site was approximately 180 ft (55 m)
below ground surface. Samples from
the borings were selected for geotechnical
laboratory testing, including
shear strength, gradation, consolidation,
index properties and corrosivity.
The results of the geotechnical investigations
revealed the site is underlain
by recent Holocene deposits that generally
consist of alluvial clay interbedded
with sand and gravel layers. Bedrock is
deep and is believed to be at a depth of
about 1,000 ft (305 m) below ground
surface at this site.
AUTHORS Kelli McCurdy, P.E., John Gouchon, P.E., G.E., and Serena Jang, P.E., G.E., LANGAN; Eric Lindquist, Ph.D., P.E., Brierley Associates; and
DEEP FOUNDATIONS * JULY/AUG 2024 * 91

July/August 2024

Table of Contents for the Digital Edition of July/August 2024

TOC
July/August 2024 - Intro
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