FUGRO WEST INC
FAULT RUPTURE HAZARD INVESTIGATION
PROPOSED BUILDING 50X
LAWRENCE BERKELEY NATIONALLABORATORY
BERKELEY CALIFORNIA
Prepared for
Lawrence Berkeley National Laboratory
August 2002
FUGRO WEST INC
August 21 2002
Project No 0658054
Lawrence Berkeley National Laboratory
One Cyclotron Road Building 900
Berkeley California 94720
Attention Mr Steve Blair
1000 Broadway Suite 200
Oakland california 94607
Tel 510 2680461
Fax 510 2680137
Subject Fault Rupture Hazard Investigation Proposed Building 50X Lawrence Berkeley
National Laboratory Berkeley California
Dear Mr Blair
Fugro is pleased to present this fault assessment report for the proposed Building 50X at
the Lawrence Berkeley National Laboratory
We thank you for providing us the opportunity to provide services to Lawrence Berkeley
FUGRO WEST INC
Mark Caruso CEOSenior Engineering Geologist
Gary mith CEOSenior Engineering Geologist
copies Submitted Mr Steve Blair Lawrence Berkeley National Laboratory
Fault iunh duc
have any questions regarding the information presented
Sincerely
National Laboratory Please call if you
in this report
20CERTIFIED
GSMRCkel
member of the Fugro group of companies with offices throughout the world
August 22 2002
Project No 0658054
CONTENTS
Page
10 INTRODUCTION
11 Project Description
Surface Conditions
13 Purpose and Scope
20 LITERATURE REVIEW
21 Regional Geology
22 Earthquake Fault Zone
23 Previous Studies
24 Aerial Photograph Evaluation
25 Literature Review Findings
30 SUBSURFACE INVESTIGATION
31 Field Program Design
32 Field Investigation
33 Field Investigation Findings
34 Limitations
40 REFERENCES
50 AERIAL PHOTOGRAPHS
FIGURES
Plate
Vicinity Map
Earthquake Fault zones Map
Site Plan
Logs of Trenches
658Q054 Fault Apt duc
August 22 2002
Project No 0658054
10 INTRODUCTION
This report presents the results of our fault rupture hazard investigation for the proposed
Building 50X at Lawrence Berkeley National Laboratory LBNL in Berkeley California The
proposed sixstory building will be located on the east side of Cyclotron Road about 300 feet
north of the Blackberry Canyon entrance as shown on the Vicinity Map Figure
We obtained information regarding the proposed Building 50X project through
discussions with Mr Steve Blair of LBNL and by reviewing preliminary site plans and concept
drawings for the building provided by Mr Blair We understand that the current design of the
new building is conceptual and preliminary and may change in the future It should be noted
that the current footprint of the proposed building was an important element in designing the
field exploration program for this study and any changes in building location could render the
results of this investigation incomplete
11 PROJECT DESCRIPTION
The planned project will involve constructing major new building in the northern portion
of LBNLs Berkeley campus west of Building 50F The proposed building site is about 80 feet
by 145 feet in maximum plan dimensions and slopes upwards toward the east from Cyclotron
Road
12 SURFACE CONDITIONS
The site is located in an area of sloping terrain on the east side of Cyclotron Road
approximately 300 feet north of the Blackberry Canyon Entrance In general site grades in the
vicinity of the proposed building slope upward to the east at an average inclination of about 21
horizontal to vertical Locally inclinations as steep as about 11 exist in cut slopes adjacent to
Cyclotron Road
The downslope side of the site is bounded by Cyclotron Road The lope side of the
site is accessed by driveway at the rear of Building 50F onestory addition constructed
during the 1980s Part of this earlier development included widening the upper access driveway
in the downslope direction by means of installation of soldier pile and drilled pier retaining wall
Elevation contours shown on topographic maps provided by LBNL indicate that the site
elevation ranges from about 630 feet to 710 feet University of California Datum
At the time of our investigation the site was covered with dry grassy vegetation and
trees which are generally typical of the Berkeley Hills We understand that some of the trees
will be removed as part of this project An existing sanitary sewer and utility easement is located
south of the proposed building
13 PURPOSE AND SCOPE
The site is located within State of California Earthquake Fault Zone for the Hayward
fault as defined by the lqEarthquake Fault Zoning Act Sites that lie within an
Documenls668 054 Fault Investigation Rpt
August 22 2002
Project No 0658054
Earthquake Fault Zone generally require that Certified Engineering Geologist conduct an
assessment of potential surface fault rupture at the specific site On the basis of this State of
California requirement fault hazard assessment program was developed to determine if the
project was geologically suitable as designed or if restrictions such as building setbacks would
be required
twophased program of study was developed with the client to meet the requirements
of the State regulations regarding the lqEarthquake Fault Zoning Act The two
phases included literature search to be followed by possible field investigation The findings
of the literature search were used to determine the need for subsurface field investigation as
well as to help define the scope of any necessary field work The initial literature search
included
Review of available geologic and fault investigation reports for the UC Berkeley area
and surrounding region This included our previous report titled Geotechnical
Investigation Building 50X Lawrence Berkeley National Laboratory Berkeley
California dated August 2002 and report by Patrick Williams of Lawrence
Berkeley Laboratory titled Features and Dimensions of the Hayward fault zone in the
Strawberry and Blackberry Creek area Berkeley California dated March 21 1995
provided by the author
Review previously prepared lqEarthquake Fault Zone reports on file with
the California Geological Survey in their San Francisco office
Review stereoscopic aerial photographs of the greater LBNL area at the offices of
Pacific
Aerial Surveys
Informally present findings of the literature review to LBNL
The scope of work for the second phase of the study the subsurface field investigation
phase was developed based on findings from the initial literature review phase
20 LITERATURE REVIEW
21 REGIONAL GEOLOGY
The site is located on the west side of the Berkeley Hills within the Coast Ranges
Geomorphic Province of Northern California This province is characterized by series of
generally northwesttrending faults and folds The Bay Area experienced uplift and faulting in
several episodes during late Tertiary time about 25 to million years ago producing series of
northwesttrending valleys and mountain ranges including the Berkeley Hills the San Francisco
Peninsula and the intervening San Francisco Bay The geology of the Berkeley Hillsarea is
strongly influenced by the nearby Hayward fault which consists of set of northwesttrending
rightlateral transcurrent faults along the base of the hills
tubd8h 054 Fault igation RpIdoc
August 22 2002 FJProject No 0658054
Review of preliminary geologic mapping of the area shows the site to be underlain at
relatively shallow depth by Cretaceous age micaceous sandstone and shale Dibblee 1980identifies the rocks in the project area as part of the Panoche Formation However Radbruch
1966 and Crane 1993 place the rock units in more general unit that they identify as
undifferentiated upper Cretaceous rocks Radbruch and Cranes classification appears
appropriate for rocks in the area as the unit is complex and rock character seems to change
over fairly short distances Radbruch describes the rock as fine to mediumgrained sand
shale and possibly minor conglomerate which is light gray when fresh and weathers to
yellowish brown Alternating beds of sandstone and shale are common but some massive
sandstone beds are present Bedrock consistent with the regional mapping was observed in
local outcrops and in the trench excavations
22 EARTHQUAKE FAULT ZONE
Beginning with maps published in 1974 California Geological Survey formerly CDMGidentified Earthquake Fault Zones at that time termed Special Study Zones enveloping the
known traces of active faults within the state The project site is located within the current
1982 State of California lqAP Earthquake Fault Zone for the northern segment
of the Hayward fault shown on Earthquake Fault Zone Map Figure The initial 1974 maps
showed somewhat wider and west shifted AP Zone than presented on the revised 1982 mapshown on Figure The 1974 AP Zone was based on the best information available at that
time regarding the location of active fault traces within the Hayward fault zone At the location
of the project site the eastern limit of the 1974 AP Zone was below Cyclotron Road Based on
more recent information the 1982 AP Zone was narrowed somewhat in the general area of the
site however the eastern limit was adjusted further eastward such that the project site is
currently located within the AP Zone The eastern limit of the AP Zone passes through
Building 50F lope of the site
23 PREVIOUS STUDIES
The active Hayward fault zone extends across the University of California Berkeley
campus with general northwest trend Geologic data regarding the locations and levels of
fault activity have been documented in series of studies beginning with Buwalda 1929 who
reported primarily on offset stream channels and other topographic features in the area that
were characteristic of fault activity Buwalda had the advantage of observing features
particularly minor topographic features which are obscured today due to extensive development
in the area Buwaldas alignment of Hayward fault trace based on observed topographic
features projected along the toe of slope westerly of the proposed Building 50X site
The next detailed evaluation of the Hayward fault on the UC Berkeley campus was
performed by Professor GD Louderback in 1939 Professor Louderback concluded that the
Hayward fault is split into two traces near Bowles Hall One trace or shear plane as he
described it passes to the east of the Greek Theatre along the base of the steep slope behind
the theatre The other fault trace later identified as the Louderback trace passes to the west of
the Greek Theatre and east of the Hearst Mining Building Louderbacks location was based on
observed shearing in the Lawson Adit tunnel used for training mining students Like
658h 054 Fault Investigation RpIdoc
August 22 2002
Project No 0658054
Buwalda whose alignment was based on surface topographic features the Louderback trace is
located near the toe of slope Although the Louderback trace is about 200 feet west of
Buwaldas alignment of features both are well to the west of the project site
Subsequent studies have been sitespecific geologic and geophysical investigations and
fault creep analyses aimed at identifying the precise locations of fault traces in the general area
along the toe of slope west of the proposed building site These studies included work by
Radbruch and Lennert 1966 Harding Lawson Associates 1986 and 1988 Geomatrix 1988and Geotechnical Consultants Inc 1992 In addition the USGS installed creepmeter and
established surveyed alignment array north of Bowles Hall Of these studies Harding Lawson
Associates HLA investigations were the most extensive Their work included surveys of offset
features drilled borings and an extensive fault trenching program HLA identified two active
traces of the Hayward fault the Main Trace and West Trace The Main Trace according to
their work is located approximately 350 feet downslope toward the west from the western edge
of the proposed building footprint The West Trace is an additional 100 to 150 feet west from
the site The locations of these two traces of the fault are consistent with the results of
investigations conducted by the other authors listed above including fault creep data from the
USGS monitoring program Summary reports compiled by Lennert and Curtis 1980 and
Williams 1995 also conclude that the active traces of the Hayward fault within the UC Berkeley
campus appear to be confined to the area along the toe of slope west of the project site
Shears of the so called Louderback Trace located about 300 to 400 feet west of the Main
Trace were reported by Lennert and Curtis 1980 following more recent evaluation to be very
old and inert since midPleistocene time The authors also note that there is no credible
evidence of activity of the Hayward fault west of the active trace However the active trace
was subsequently divided into the Main Trace and the nearby West Trace by HLA 1988 In
addition Lennert and Curtis 1980 state that all movement in Holocene time the last
11000 years has occurred solely on the active trace and that there is no evidence of any right
lateral fault activity east of the active trace within the campus area
24 AERIAL PHOTOGRAPH EVALUATION
Black and white stereoscopic aerial photographs of the project area were viewed to
discern geomorphic evidence of faulting The photos used in our evaluation were flown in 1950
1957 1969 1979 1988 and 1999 The earlier photos were useful since less cultural features
were observed that tend to obscure faultrelated features The 1950 photos were particularly
useful due to the relatively low flight elevation list of the photos viewed during our study is
included in the References section of this report
Based on our aerial photo analysis evidence of the active trace of the fault could be
identified at several locations near the base of the slope below the project site continuous
lineament was not discernable but the discontinuous benches and visible depressions were in
alignment The West Trace as identified by HLA could not be discerned as separate feature
primarily because of the tree and brush cover lower on the slope In the earlier photos the
hillside where the project site is located was more open allowing for relatively good
assessment of the project area No apparent faultrelated features were identified on or aligned
with the project site
Fault RpIttoc
August222002
Project No 0658054
25 LITERATURE REVIEW FINDINGS
The earliest studies based on observed surface features postulated an active trace
location for the Hayward fault near the toe of slope west of the project site Over the years
geologic assessments and fault investigations for proposed new development refined the data
but did not significantly change the location of the active traces California Geological Survey
CGS used the same approximate location of the fault for determining the limits of the AP
Earthquake Fault Zone in the area However when CGS replaced the 1974 AP Zone Map with
the updated 1982 edition their uncertainty was evident as they adjusted the AP Zone further to
the east including the project site in the AP Zone for the first time
All information reviewed during the literature search phase of the study indicated that the
only active traces of the Hayward fault in the vicinity of the project site are located within
relatively narrow zone near the toe of slope approximately 350 feet west of the site However
we found no evidence of previous fault trenching performed easterly of the known active traces
Therefore there was no way to preclude the possibility that strand of the fault could be located
within the project site Based on these findings it was recommended to LBNL that field
investigation should follow to determine if any previously unknown faults existed within the
property which could impact proposed Building 50X
30 SUBSURFACE INVESTIGATION
Based on the results of our literature review and discussions with LBNL personnel our
scope of work for the second phase of the study the subsurface investigation consisted of
excavation and logging of series of fault investigation trenches designed to intercept faults
potentially crossing the site
31 FIELD PROGRAM DESIGN
The purpose of the field exploration program was to determine if ground surface rupture
from active fault traces would impact the proposed building site For the footprint of the building
to be cleared no active fault trace could extend into the building footprint In addition for
investigations where active faults are detected building setback zone of up to 50 feet is
generally established on each side of the identified fault trace Consequently the layout of
exploration trenches for this study needed to be such that the actual building footprint could be
cleared as well as zone beyond the limits of the actual proposed building
Locations for the exploration trenches were designed to intercept faults crossing the site
with the same general trend as the known active traces in the area as well as the trend of the
local AP Zone boundaries which is N22W primary trench was recommended along the
southern edge of the proposed building This long trench was positioned so as to intercept
most fault trends or alignments that could potentially extend through the property Even if no
faulting were identified in the long primary trench the data could not assure that fault did not
exist just beyond the terminus of the trench To eliminate the possibility of this occurring two
additional shorter trenches were added one further to the south and the other north of the
658Q054 Fault Investigation Apt duo
August22 2002
Project No 0658054
building footprint All reasonable projections of fault passing through the project site would be
intercepted by at least one of these trenches
32 FIELD INVESTIGATION
The field investigation consisted of geologic mapping of outcrops and cut slope
exposures and the excavation of three fault exploration trenches The locations of the trenches
are shown on the Site Plan Figure Trenches were excavated with tracked excavator using
3foot wide bucket with the depth of trenches varying from about feet to maximum depth
of about 12 feet The trenches were excavated in generally competent materials and the
exposed sidewalls could be observed without sloughing or cavein problems The trenches
were shored using hydraulic shoring units installed in accordance with OSHA requirements
One trench sidewall was scraped and cleaned to eliminate surface smearing by the excavator
and to remove loose debris The prepared trenches were then logged by team of registered
engineering geologists The prepared logs of the three exploration trenches are shown on Log
of Trenches Figure
In general the trenches disclosed fairly uniform distribution of subsurface materials
consisting of surface layer about feet thick of dark graybrown colluvial clays grading
downward into lighter colored residual clayey soil containing rock fragments At depths
typically ranging from feet to feet the materials gradually changed to weathered rock
Underlying the weathered rock zone was blocky to massive sandstone that became more
resistant with depth Descriptions of the rock units and the overlying soil units are provided on
the Logs of Trenches Figure In trenches T1 and T3 olivegray finegrained sandstone was
present throughout the trenches The rock was weathered to medium brown with dark brown
staining Bedding was commonly to inches in thickness and the strong joint set patterns
created blocky character to the layered rocks In the southernmost trench T2 more
massive lighter colored and more coarsegrained sandstone was encountered The western
end of Trench T1 passed along the southern edge of gentle swale Colluvial deposits and
residual soils overlying the rock were considerably deeper at that location These colluvial
materials extended to maximum depth of about feet
33 FIELD INVESTIGATION FINDINGS
No faultrelated features were disclosed in any of the three trenches Based on the
results of our field investigation we conclude that there are no faultrelated issues that impact
the current location of Building 50X as shown on the Site Plan Figure
It should be noted that the field program was designed to disclose faults which might
pass through or adjacent to the building location shown on Figure If the building location is
changed or if additional structures are included in the plan the findings of this study may be
inconclusive and additional work could be required Fugro West Inc should be notified in the
event that any changes or additions to building locations are planned so that we may review the
changes and determine if the above findings are appropriate for the changed conditions
054Final 054h Fault Inuestigation Opt dun
August 22 2002
Project No 0658054
34 LIMITATIONS
The conclusions and recommendations presented herein are the results of study of
inherently limited scope Specifically the scope of our services consisted of the analysis of
whether previously unknown active faults would impact the proposed Building 50X at the
currently designated location and preparation of this report The conclusions and
recommendations contained in this report are professional opinions derived in accordance with
current standards of professional practice No warranty is expressed or implied
This report has been prepared for the exclusive use of Lawrence Berkeley National
Laboratory and applies only to the proposed development plans In the event that significant
changes in the development plans should occur the conclusions and recommendations
contained in this report shall not be considered valid unless the changes are reviewed by Fugro
West Inc and the conclusions and recommendations of this report are verified in writing
054h Fault tnvustigutiuu Rptduc
August 22 2002
Project No 0658054
40 REFERENCES
Buwalda JP 1929 Nature of the Late Movements on the Hayward Rift Central California
Bulletin of the Seismological Society of America 19 187199
Crane Ron 1993 Geology of the Richmond Quadrangle California published by the
Geological Survey
Department of Conservation California Division of Mines and Geology 1980 Fault Evaluation
Report FERlOl and FER102
Department of Conservation California Division of Mines and Geology State of California
Special Studies Zones Oakland East Revised Official Map Effective January 1992
Department of Conservation California Division of Mines and Geology State of California
Special Studies Zones Richmond Quadrangle Revised Official Map Effective
January 1982
Department of Conservation Division of Mines and Geology FaultRupture Hazard Zones in
California Special Publication 42 Revised 1997
Dibblee TW Jr 1980 Preliminary Geologic Map of the Richmond Quadrangle Alameda and
Contra Costa Counties California Department of the Interior United States Geological
Survey Open File Report 801100
Geotechnical Consultants Inc 1992 Fault Investigation West Trace of the Hayward Fault
Bowles Hall Renovation Project University of California Berkeley California
Harding Lawson Associates 1986 Geologic and Fault Hazard Investigation Proposed Student
Housing University of California
Harding Lawson Associates 1988 Geologic and Fault Hazard Investigation Phase Foothill
Student Housing University of California Berkeley California file at California
Division of Mines and Geology San Francisco California file no
Harding Lawson Associates 1988 Supplemental Fault Hazard Investigation
Foothill Student Housing Project University of California Berkeley California
Hart EW 1975 Guidelines for Evaluating the Hazard of Surface Fault Rupture California
Division of Mines and Geology CDMG Note 49
Herd DG 1978 Map of Quaternary Faulting Along the Northern Hayward Fault Zone
California US Geological Survey Open File Report 7830
Lennert BJ and Curtis GH 1980 Fault Hazard Study Berkeley Campus University of
California
655Q054 Fault Rpt don
August 22 2002
Project No 0658054
Lien kaemper JJ 1992 Map of recently active traces of the Hayward fault Alameda and
Contra Costa Counties California US Geological Survey Map MF21 96 sheet
Radbruch DH 1957 Areal and Engineering Geology of the Oakland West Quadrangle
California Miscellaneous Geologic Investigations Map USGS
Radbruch DH 1969 Areal and Engineering Geology of the Oakland East Quadrangle
California Map GQ769 USGS
Radbruch DH and Len nert BJ 1966 Damage to Culvert Under Memorial Stadium
University of California Berkeley Caused by Slippage in the Hayward Fault ZoneBulletin of the Seismological Society of America Vol 56 No pp 295304
Williams PL 1995 Features and Dimensions of the Hayward Fault Zone in the Strawberry
and Blackberry Creek area Berkeley California
50 AERIAL PHOTOGRAPHS
Date Uh41450 AV28158 10 17200
5457 AV253919 22 11200051669 9018 19 112000
9679 AV1 750921 22 112000
8388 AV3368920 21 112000121599 AV642147 112000
656658h Fin Documents658054 Fault Invuutigutiuu Rpt duu
FIGURES
BASE MAP MO BY ThOMAS IDE
IflflO FUGRO WEST INC
1000 Broadway Suite 200
Oakland California 94607
Tel5102680461
10263
VICINITY MAP
BUILDING 50XLAWRENCE BERKELEY NATIONAL LAB
BERKELEY CALIFORNIA
flFUGRO WEST INC
1000 Broadway Suite 200
Oakland Calilarnia 94607
Tel5102680451
Fax5102580137
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BASE Oh BY 30 OP AND STATE OF iEMh 1982 ZONES MAPS WEST OAKLAND EAST AltO QUADRANGLES
EARTHQUAKE FAULT ZONES MAP
BUILDING 50X
LAWRENCE BERKELEY NATIONAL LABBERKELEY CALIFORNIA
GENERAL LOCAL TREND OF MAPPED FAULTS
WITHIN STATE OF CALIFORNIA EARTHQUAKEFAULT ZONE FOR THE HAYWARD FAULT
30 60
GEOLOGIC CONTACTS
APPROXIMATE SCALE IN FEET
TRENCH LOCATION APPROXIMATE
T3
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STRIKE AND DIP OF BEDS
ARTIFICIAL FILL
QUATERNARY COLLUVIAL DEPOSITS
UNDIFFERENCIATED ROCKS OF CRETACEOUS AGE
APPROXIMATE FOOTPRINT OF PROPOSED BUILDING
FUCRO WEST INC1000 Broadway Suite 200
Oakland lif 94607
Tel5102680461
Fox5102680137
DRAWN BY R0C SITE PLAN FIGUREPREPD BY MCGS
APPD BY MCGS
LAWRENCE
BUILDING 50X
BERKELEY NATIONAL LABORATORYBERKELEY CALIFORNIA
SCALE
PROJECT NoDATE 20AUG02
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FUGRO WEST INC
3S3FAULT RUPTURE HAZARD INVESTIGATION
PROPOSED BUILDING 50X
LAWRENCE BERKELEY NATIONALLABORATORY
BERKELEY CALIFORNIA
Prepared for
Lawrence Berkeley National Laboratory
August 2002
FUGRO WEST INC
August 21 2002
Project No 0658054
Lawrence Berkeley National Laboratory
One Cyclotron Road Building 90G
Berkeley California 94720
Attention Mr Steve Blair
1000 Broadway Suite 200
Oakland california 94607
Tel 510 2680461
Fax 510 2680137
Subject Fault Rupture Hazard Investigation Proposed Building 50X Lawrence Berkeley
National Laboratory Berkeley California
Dear Mr Blair
Fugro is pleased to present this fault assessment report for the proposed Building 50X at
the Lawrence Berkeley National Laboratory
We thank you for providing us the opportunity to provide services to Lawrence Berkeley
National Laboratory Please call if you have any questions regarding the information presented
in this report
Sincerely
FUGRO WEST INC
theeMark Caruso CEG
Senior Engineering Geologist
copies Submitted Mr Steve Blair Lawrence Berkeley National Laboratory
Nob lQcQ Fault Rpt dcc
member of the Fugro group of companies with offices throughout the world
Gary CEG
Senior Engineering Geologist
August 22 2002
Project No 0658054
10 INTRODUCTION
This report presents the results of our fault rupture hazard investigation for the proposed
Building 50X at Lawrence Berkeley National Laboratory LBNL in Berkeley California The
proposed sixstory building will be located on the east side of Cyclotron Road about 300 feet
north of the Blackberry Canyon entrance as shown on the Vicinity Map Figure
We obtained information regarding the proposed Building 50X project through
discussions with Mr Steve Blair of LBNL and by reviewing preliminary site plans and concept
drawings for the building provided by Mr Blair We understand that the current design of the
new building is conceptual and preliminary and may change in the future It should be noted
that the current footprint of the proposed building was an important element in designing the
field exploration program for this study and any changes in building location could render the
results of this investigation incomplete
11 PROJECT DESCRIPTION
The planned project will involve constructing major new building in the northern portion
of LBNLs Berkeley campus west of Building 50F The proposed building site is about 80 feet
by 145 feet in maximum plan dimensions and slopes upwards toward the east from Cyclotron
Road
12 SURFACE CONDITIONS
The site is located in an area of sloping terrain on the east side of Cyclotron Road
approximately 300 feet north of the Blackberry Canyon Entrance In general site grades in the
vicinity of the proposed building slope upward to the east at an average inclination of about 21
horizontal to vertical Locally inclinations as steep as about 11 exist in cut slopes adjacent to
Cyclotron Road
The downslope side of the site is bounded by Cyclotron Road The lope side of the
site is accessed by driveway at the rear of Building 50F onestory addition constructed
during the 1980s Part of this earlier development included widening the upper access driveway
in the downslope direction by means of installation of soldier pile and drilled pier retaining wall
Elevation contours shown on topographic maps provided by LBNL indicate that the site
elevation ranges from about 630 feet to 710 feet University of California Datum
At the time of our investigation the site was covered with dry grassy vegetation and
trees which are generally typical of the Berkeley Hills We understand that some of the trees
will be removed as part of this project An existing sanitary sewer and utility easement is located
south of the proposed building
13 PURPOSE AND SCOPE
The site is located within State of California Earthquake Fault Zone for the Hayward
fault as defined by the lqEarthquake Fault Zoning Act Sites that lie within an
Ducuments658 04 Fault Investigation Rpl don
August 22 2002
Project No 0658054
Earthquake Fault Zone generally require that Certified Engineering Geologist conduct an
assessment of potential surface fault rupture at the specific site On the basis of this State of
California requirement fault hazard assessment program was developed to determine if the
project was geologically suitable as designed or if restrictions such as building setbacks would
be required
twophased program of study was developed with the client to meet the requirements
of the State regulations regarding the lqEarthquake Fault Zoning Act The two
phases included literature search to be followed by possible field investigation The findings
of the literature search were used to determine the need for subsurface field investigation as
well as to help define the scope of any necessary field work The initial literature search
included
Review of available geologic and fault investigation reports for the UC Berkeley area
and surrounding region This included our previous report titled Geotechnical
Investigation Building 50X Lawrence Berkeley National Laboratory Berkeley
California dated August 2002 and report by Patrick Williams of Lawrence
Berkeley Laboratory titled Features and Dimensions of the Hayward fault zone in the
Strawberry and Blackberry Creek area Berkeley California dated March 21 1995
provided by the author
Review previously prepared lqEarthquake Fault Zone reports on file with
the California Geological Survey in their San Francisco office
Review stereoscopic aerial photographs of the greater LBNL area at the offices of
Pacific
Aerial Surveys
Informally present findings of the literature review to LBNL
The scope of work for the second phase of the study the subsurface field investigation
phase was developed based on findings from the initial literature review phase
20 LITERATURE REVIEW
21 REGIONAL GEOLOGY
The site is located on the west side of the Berkeley Hills within the Coast Ranges
Geomorphic Province of Northern California This province is characterized by series of
generally northwesttrending faults and folds The Bay Area experienced uplift and faulting in
several episodes during late Tertiary time about 25 to million years ago producing series of
northwesttrending valleys and mountain ranges including the Berkeley Hills the San Francisco
Peninsula and the intervening San Francisco Bay The geology of the Berkeley Hills area is
strongly influenced by the nearby Hayward fault which consists of set of northwesttrending
rightlateral transcurrent faults along the base of the hills
658658 054h Fault Rpt des
August 22 2002
Project No 0658054
Review of preliminary geologic mapping of the area shows the site to be underlain at
relatively shallow depth by Cretaceous age micaceous sandstone and shale Dibblee 1980identifies the rocks in the project area as part of the Panoche Formation However Radbruch
1966 and Crane 1993 place the rock units in more general unit that they identify as
undifferentiated upper Cretaceous rocks Radbruch and Cranes classification appears
appropriate for rocks in the area as the unit is complex and rock character seems to change
over fairly short distances Radbruch describes the rock as fine to mediumgrained sand
shale and possibly minor conglomerate which is light gray when fresh and weathers to
yellowish brown Alternating beds of sandstone and shale are common but some massive
sandstone beds are present Bedrock consistent with the regional mapping was observed in
local outcrops and in the trench excavations
22 EARTHQUAKE FAULT ZONE
Beginning with maps published in 1974 California Geological Survey formerly CDMGidentified Earthquake Fault Zones at that time termed Special Study Zones enveloping the
known traces of active faults within the state The project site is located within the current
1982 State of CalifornialqAP Earthquake Fault Zone for the northern segment
of the Hayward fault shown on Earthquake Fault Zone Map Figure The initial 1974 mapsshowed somewhat wider and west shifted AP Zone than presented on the revised 1982 mapshown on Figure The 1974 AP Zone was based on the best information available at that
time regarding the location of active fault traces within the Hayward fault zone At the location
of the project site the eastern limit of the 1974 AP Zone was below Cyclotron Road Based on
more recent information the 1982 AP Zone was narrowed somewhat in the general area of the
site however the eastern limit was adjusted further eastward such that the project site is
currently located within the AP Zone The eastern limit of the AP Zone passes through
Building 50F lope of the site
23 PREVIOUS STUDIES
The active Hayward fault zone extends across the University of California Berkeley
campus with general northwest trend Geologic data regarding the locations and levels of
fault activity have been documented in series of studies beginning with Buwalda 1929 who
reported primarily on offset stream channels and other topographic features in the area that
were characteristic of fault activity Buwalda had the advantage of observing features
particularly minor topographic features which are obscured today due to extensive development
in the area Buwaldas alignment of Hayward fault trace based on observed topographic
features projected along the toe of slope westerly of the proposed Building 50X site
The next detailed evaluation of the Hayward fault on the UC Berkeley campus was
performed by Professor GD Louderback in 1939 Professor Louderback concluded that the
Hayward fault is split into two traces near Bowles Hall One trace or shear plane as he
described it passes to the east of the Greek Theatre along the base of the steep slope behind
the theatre The other fault trace later identified as the Louderback trace passes to the west of
the Greek Theatre and east of the Hearst Mining Building Louderbacks location was based on
observed shearing in the Lawson Adit tunnel used for training mining students Like
658Q054 Fault luveutugutrun RpLduu
August 22 2002
Project No 0658054
Buwalda whose alignment was based on surface topographic features the Louderback trace is
located near the toe of slope Although the Louderback trace is about 200 feet west of
Buwaldas alignment of features both are well to the west of the project site
Subsequent studies have been sitespecific geologic and geophysical investigations and
fault creep analyses aimed at identifying the precise locations of fault traces in the general area
along the toe of slope west of the proposed building site These studies included work by
Radbruch and Lennert 1966 Harding Lawson Associates 1986 and 1988 Geomatrix 1988and Geotechnical Consultants Inc 1992 In addition the USGS installed creepmeter and
established surveyed alignment array north of Bowles Hall Of these studies Harding Lawson
Associates HLA investigations were the most extensive Their work included surveys of offset
features drilled borings and an extensive fault trenching program HLA identified two active
traces of the Hayward fault the Main Trace and West Trace The Main Trace according to
their work is located approximately 350 feet downslope toward the west from the western edge
of the proposed building footprint The West Trace is an additional 100 to 150 feet west from
the site The locations of these two traces of the fault are consistent with the results of
investigations conducted by the other authors listed above including fault creep data from the
USGS monitoring program Summary reports compiled by Lennert and Curtis 1980 and
Williams 1995 also conclude that the active traces of the Hayward fault within the UC Berkeley
campus appear to be confined to the area along the toe of slope west of the project site
Shears of the so called Louderback Trace located about 300 to 400 feet west of the Main
Trace were reported by Lennert and Curtis 1980 following more recent evaluation to be very
old and inert since midPleistocene time The authors also note that there is no credible
evidence of activity of the Hayward fault west of the active trace However the active trace
was subsequently divided into the Main Trace and the nearby West Trace by HLA 1988 In
addition Lennert and Curtis 1980 state that all movement in Holocene time the last
11000 years has occurred solely on the active trace and that there is no evidence of any right
lateral fault activity east of the active trace within the campus area
24 AERIAL PHOTOGRAPH EVALUATION
Black and white stereoscopic aerial photographs of the project area were viewed to
discern geomorphic evidence of faulting The photos used in our evaluation were flown in 1950
1957 1969 1979 1988 and 1999 The earlier photos were useful since less cultural features
were observed that tend to obscure faultrelated features The 1950 photos were particularly
useful due to the relatively low flight elevation list of the photos viewed during our study is
included in the References section of this report
Based on our aerial photo analysis evidence of the active trace of the fault could be
identified at several locations near the base of the slope below the project site continuous
lineament was not discernable but the discontinuous benches and visible depressions were in
alignment The West Trace as identified by HLA could not be discerned as separate feature
primarily because of the tree and brush cover lower on the slope In the earlier photos the
hillside where the project site is located was more open allowing for relatively good
assessment of the project area No apparent faultrelated features were identified on or aligned
with the project site
Documents658 054 Fault Rptduc
August 22 2002
Project No 0658054
25 LITERATURE REVIEW FINDINGS
The earliest studies based on observed surface features postulated an active trace
location for the Hayward fault near the toe of slope west of the project site Over the years
geologic assessments and fault investigations for proposed new development refined the data
but did not significantly change the location of the active traces California Geological Survey
CGS used the same approximate location of the fault for determining the limits of the AP
Earthquake Fault Zone in the area However when CGS replaced the 1974 AP Zone Map with
the updated 1982 edition their uncertainty was evident as they adjusted the AP Zone further to
the east including the project site in the AP Zone for the first time
All information reviewed during the literature search phase of the study indicated that the
only active traces of the Hayward fault in the vicinity of the project site are located within
relatively narrow zone near the toe of slope approximately 350 feet west of the site However
we found no evidence of previous fault trenching performed easterly of the known active traces
Therefore there was no way to preclude the possibility that strand of the fault could be located
within the project site Based on these findings it was recommended to LBNL that field
investigation should follow to determine if any previously unknown faults existed within the
property which could impact proposed Building 50X
30 SUBSURFACE INVESTIGATION
Based on the results of our literature review and discussions with LBNL personnel our
scope of work for the second phase of the study the subsurface investigation consisted of
excavation and logging of series of fault investigation trenches designed to intercept faults
potentially crossing the site
31 FIELD PROGRAM DESIGN
The purpose of the field exploration program was to determine if ground surface rupture
from active fault traces would impact the proposed building site For the footprint of the building
to be cleared no active fault trace could extend into the building footprint In addition for
investigations where active faults are detected building setback zone of up to 50 feet is
generally established on each side of the identified fault trace Consequently the layout of
exploration trenches for this study needed to be such that the actual building footprint could be
cleared as well as zone beyond the limits of the actual proposed building
Locations for the exploration trenches were designed to intercept faults crossing the site
with the same general trend as the known active traces in the area as well as the trend of the
local AP Zone boundaries which is N22W primary trench was recommended along the
southern edge of the proposed building This long trench was positioned so as to intercept
most fault trends or alignments that could potentially extend through the property Even if no
faulting were identified in the long primary trench the data could not assure that fault did not
exist just beyond the terminus of the trench To eliminate the possibility of this occurring two
additional shorter trenches were added one further to the south and the other north of the
jo Documents658 054 Fault RFt
August 22 2002
Project No 0658054
building footprint All reasonable projections of fault passing through the project site would be
intercepted by at least one of these trenches
32 FIELD INVESTIGATION
The field investigation consisted of geologic mapping of outcrops and cut slope
exposures and the excavation of three fault exploration trenches The locations of the trenches
are shown on the Site Plan Figure Trenches were excavated with tracked excavator using
3foot wide bucket with the depth of trenches varying from about feet to maximum depth
of about 12 feet The trenches were excavated in generally competent materials and the
exposed sidewalls could be observed without sloughing or cavein problems The trenches
were shored using hydraulic shoring units installed in accordance with OSHA requirements
One trench sidewall was scraped and cleaned to eliminate surface smearing by the excavator
and to remove loose debris The prepared trenches were then logged by team of registered
engineering geologists The prepared logs of the three exploration trenches are shown on Log
of Trenches Figure
In general the trenches disclosed fairly uniform distribution of subsurface materials
consisting of surface layer about feet thick of dark graybrown colluvial clays grading
downward into lighter colored residual clayey soil containing rock fragments At depths
typically ranging from feet to feet the materials gradually changed to weathered rock
Underlying the weathered rock zone was blocky to massive sandstone that became more
resistant with depth Descriptions of the rock units and the overlying soil units are provided on
the Logs of Trenches Figure In trenches 11 and T3 olivegray finegrained sandstone was
present throughout the trenches The rock was weathered to medium brown with dark brown
staining Bedding was commonly to inches in thickness and the strong joint set patterns
created blocky character to the layered rocks In the southernmost trench T2 more
massive lighter colored and more coarsegrained sandstone was encountered The western
end of Trench T1 passed along the southern edge of gentle swale Colluvial deposits and
residual soils overlying the rock were considerably deeper at that location These colluvial
materials extended to maximum depth of about feet
33 FIELD INVESTIGATION FINDINGS
No faultrelated features were disclosed in any of the three trenches Based on the
results of our field investigation we conclude that there are no faultrelated issues that impact
the current location of Building 50X as shown on the Site Plan Figure
It should be noted that the field program was designed to disclose faults which might
pass through or adjacent to the building location shown on Figure If the building location is
changed or if additional structures are included in the plan the findings of this study may be
inconclusive and additional work could be required Fugro West Inc should be notified in the
event that any changes or additions to building locations are planned so that we may review the
changes and determine if the above findings are appropriate for the changed conditions
tju658Q054 Fault Rptduc
August 22 2002
Project No 0658054
34 LIMITATIONS
The conclusions and recommendations presented herein are the results of study of
inherently limited scope Specifically the scope of our services consisted of the analysis of
whether previously unknown active faults would impact the proposed Building 50X at the
currently designated location and preparation of this report The conclusions and
recommendations contained in this report are professional opinions derived in accordance with
current standards of professional practice No warranty is expressed or implied
This report has been prepared for the exclusive use of Lawrence Berkeley National
Laboratory and applies only to the proposed development plans In the event that significant
changes in the development plans should occur the conclusions and recommendations
contained in this report shall not be considered valid unless the changes are reviewed by Fugro
West Inc and the conclusions and recommendations of this report are verified in writing
8h 054 Fault Irrvestigution Rpt doc
August 22 2002
Project No 0658054
REFERENCES
Buwalda JP 1929 Nature of the Late Movements on the Hayward Rift Central California
Bulletin of the Seismological Society of America 19 187199
Crane Ron 1993 Geology of the Richmond Quadrangle California published by the
Geological Survey
Department of Conservation California Division of Mines and Geology 1980 Fault Evaluation
Report FER1 01 and FER102
Department of Conservation California Division of Mines and Geology State of California
Special Studies Zones Oakland East Revised Official Map Effective January 1992
Department of Conservation California Division of Mines and Geology State of California
Special Studies Zones Richmond Quadrangle Revised Official Map Effective
January 1982
Department of Conservation Division of Mines and Geology FaultRupture Hazard Zones in
California Special Publication 42 Revised 1997
Dibblee TW Jr 1980 Preliminaiy Geologic Map of the Richmond Quadrangle Alameda and
Contra Costa Counties California Department of the Interior United States Geological
Survey Open File Report 801100
Geotechnical Consultants Inc 1992 Fault Investigation West Trace of the Hayward Fault
Bowles Hall Renovation Project University of California Berkeley California
Harding Lawson Associates 1986 Geologic and Fault Hazard Investigation Proposed Student
Housing University of California
Harding Lawson Associates 1988 Geologic and Fault Hazard Investigation Phase Foothill
Student Housing University of California Berkeley California file at California
Division of Mines and Geology San Francisco California file no
Harding Lawson Associates 1988 Supplemental Fault Hazard Investigation
Foothill Student Housing Project University of California Berkeley California
Hart EW 1975 Guidelines for Evaluating the Hazard of Surface Fault Rupture California
Division of Mines and Geology CDMG Note 49
Herd DG 1978 Map of Quaternary Faulting Along the Northern Hayward Fault ZoneCallfornia US Geological Survey Open File Report 78308
Lennert BJ and Curtis GH 1980 Fault Hazard Study Berkeley Campus University of
California
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Lien kaemper JJ 1992 Map of recently active traces of the Hayward fault Alameda and
Contra Costa Counties California US Geological Survey Map MF21 96 sheet
Radbruch DH 1957 Areal and Engineering Geology of the Oakland West Quadrangle
California Miscellaneous Geologic Investigations Map USGS
Radbruch DH 1969 Areal and Engineering Geology of the Oakland East Quadrangle
California Map GQ769 USGS
Radbruch DH and Lennert BJ 1966 Damage to Culvert Under Memorial Stadium
University of Cailfornia Berkeley Caused by Slippage in the Hayward Fault ZoneBulletin of the Seismological Society of America Vol 56 No pp 295304
Williams PL 1995 Features and Dimensions of the Hayward Fault Zone in the Strawberry
and Blackberry Creek area Berkeley California
50 AERIAL PHOTOGRAPHS
Date Uh41450 AV281 58 10 172005457 25 22 11200051669 9018 19 1120009679 750921 22 1120008388 33 21 112000121599 64 112000
054h Fault Rpl duc
FIGURES
ORO FUGRO WEST1000 Broadway Suite 200
Oakland California 94607
Tel5102680461
Fax5102660137
BERKELEY
BASE MAP DV BY MQA GUIDE 16 BAY AREA 2000
VICINITY MAP
BUILDING 50XLAWRENCE BERKELEY NATIONAL
BERKELEY CALIFORNIA
FIGURE
IL0658054
ORO FUGRO WEST INC
1000 Broadway Suite 200
Oakland Calitornia 94607
Tel5102680461
Fax5102680137
tn fl
11111
1h
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BASE MAP OQ BY LOR 30 IJQA AND STATE Of IJ 1982 IES ZONES MAPS AMh CT OAQAM EAST AND RICHMOND QUADRANGLES
CAflTHOUAKE FAULT ZONES MAP
BUILDING 50X
LAWRENCE BERKELEY NATIONAL LABBERKELEY CALIFORNIA
FIGURE
PROJECT No
0658054
GENERAL LOCAL TREND OF MAPPED FAULTS
WITHIN STATE OF CALIFORNIA EARTHQUAKEFAULT ZONE FOR THE HAYWARD FAULT
APPROXIMATE SCALE IN FEET
30
13TRENCH LOCATION APPROXIMATE
GEOLOGIC CONTACTS
60
Qaf
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STRIKE AND DIP OF BEDS
ARTIFICIAL FILL
QUATERNARY COLLUVIAL DEPOSITS
UNDIFFERENCIATED ROCKS OF CRETACEOUS AGE
APPROXIMATE FOOTPRINT OF PROPOSED BUILDING
Iiiniio FUGRO WEST INC1000 Broadway Suite 200
Oakland California 94607
Fax5102680137
Tel5102680461
DRAWN BY R0CSITE PLAN FIGURE
BY MCGS
APPD BY MCGS
LAWRENCEBUILDING 50X
BERKELEY NATIONAL LABORATORYBERKELEY CALIFORNIA
SCALE 30
PROJECT NoDATE 20AUG02
0658054DWG FILE 065805403
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