fault rupture hazard evaluation 9900 wilshire …gmw.consrv.ca.gov/shp/apsi_siteinvestigation... ·...

FAULT RUPTURE HAZARD EVALUATION

9900 WILSHIRE BOULEVARD BEVERLY HILLS, CALIFORNIA

PREPARED FOR

ALLEN MATKINS LECK GAMBLE MALORY & NATSIS LLP

LOS ANGELES, CALIFORNIA

PROJECT NO. A9009-06-01

APRIL 22, 2013

Project No. A9009-06-01 April 22, 2013 VIA EMAIL Allen Matkins Leck Gamble Malory & Natsis LLP 515 South Figueroa Street, 9th Floor Los Angeles, CA 90071 Attention: Patrick Perry Subject: REPORT OF FAULT RUPTURE HAZARD EVALUATION 9900 WILSHIRE BOULEVARD BEVERLY HILLS, CALIFORNIA 90212 Dear Mr. Perry: Geocon West, Inc. is pleased to submit this report summarizing our fault rupture hazard evaluation for the existing commercial development located at 9900 Wilshire Boulevard in the city of Beverly Hills, California. The active Santa Monica Fault Zone and the West Beverly Hills Lineament, a linear geologic feature that is postulated to be associated with faulting and/or erosion processes, are mapped within the vicinity of the 9900 Wilshire site. The purpose of our evaluation was to identify faults that may traverse the site and evaluate the potential for surface fault rupture. This evaluation was conducted in general accordance with our Proposal dated January 23, 2013 and the terms and conditions contained in Contract between Geocon West Inc. and BH Wilshire International authorized on February 11, 2013. It is our understanding that this report will be submitted to the city of Beverly Hills as part of the review process for a future development at the site. We appreciate the opportunity to be of service to you. Please contact us if you have any questions regarding this report, or if we may be of further service. Very truly yours, Susan F. Kirkgard CEG 1754

Gerald Kasman CEG 2251

TABLE OF CONTENTS

1. INTRODUCTION ................................................................................................................................ 1

2. EXECUTIVE SUMMARY ................................................................................................................... 1

3. SITE LOCATION AND DESCRIPTION ............................................................................................ 3

4. SCOPE .................................................................................................................................................. 4

5. FAULT ACTIVITY CRITERIA ........................................................................................................... 5

6. BACKGROUND .................................................................................................................................. 5 6.1. Local Fault Investigations ........................................................................................................... 6 6.2. Summary of Local Fault Investigations Results ....................................................................... 10

7. GEOLOGIC SETTING ....................................................................................................................... 10

8. NEWPORT-INGLEWOOD FAULT ZONE / WEST BEVERLY HILLS LINEAMENT ................ 11

9. SANTA MONICA FAULT ZONE ..................................................................................................... 12

10. DATA ANALYSIS ............................................................................................................................. 13 10.1 General ...................................................................................................................................... 13 10.2. Evaluation of the Santa Monica Fault Zone ............................................................................. 14 10.3. Evaluation of the West Beverly Hills Lineament Faults .......................................................... 16 10.4. Kenney GeoScience Interpretations.......................................................................................... 19

11. CONCLUSIONS ................................................................................................................................. 22

LIST OF REFERENCES MAPS, TABLES, AND ILLUSTRATIONS Figure 1, Vicinity Map Figure 2, Geologic Map Figure 3, Parsons Fault Map Figure 4, Local Fault Investigations Figure 5, Recent WBHL Fault Studies Figure 6A, Site Plan Figure 6B, Geologic Section A-A’ Figure 7, Parsons Transect 7 Figure 8A, Parsons Transect 2E Figure 8B, Geocon Transect 2E Interpretation Figure 8C, Geocon Transect 2E Interpretation Figure 9, Transect 2E – Geophysical Interpretation Figure 10, Kenney Geologic Map Figure 11, Transect 2E – Kenney Interpretation Figure 12, Parsons Transect 4 Figure 13, Transect 4 – Kenney Interpretation

TABLE OF CONTENTS (Continued)

APPENDIX A BORING LOGS – PREVIOUS MACTEC REPORTS – 9900 WILSHIRE BOULEVARD APPENDIX B GROUNDWATER ELEVATION CONTOUR MAP AND BORING LOGS – 9988 WILSHIRE BOULEVARD

Project No. A9009-06-01 - 1 - April 22, 2013

FAULT RUPTURE HAZARD EVALUATION

1. INTRODUCTION

This report presents the results of our fault rupture hazard evaluation for the existing commercial

development located at 9900 Wilshire Boulevard in the city of Beverly Hills, California (the 9900

Wilshire site). The location of the 9900 Wilshire site relative to surrounding features is shown on Figure

1, Vicinity Map.

The purpose of our evaluation was to assess the presence of active faults within the 9900 Wilshire site

boundaries that may impact future development. Geologic maps prepared by the California Geological

Survey (CGS, 2010) indicate that the Santa Monica Fault Zone and the northern extension of the

Newport-Inglewood Fault Zone, also known as the West Beverly Hills Lineament, are located within the

vicinity of the 9900 Wilshire site. The West Beverly Hills Lineament may be related to erosion or faulting

or a combination of the two. The geologic conditions in the area near the 9900 Wilshire site are indicated

on Figure 2, Geologic Map.

2. EXECUTIVE SUMMARY

Areas around the 9900 Wilshire site have been postulated to be affected by faulting. Recent geologic maps

prepared by the California Geological Survey (CGS, 2010) indicate the Santa Monica Fault Zone (SMFZ) is

located approximately 180 feet west of the 9900 Wilshire site at its closest point and the northern extension

of the Newport-Inglewood Fault Zone (NIFZ), also known as the West Beverly Hills Lineament (WBHL),

may be present near the western boundary of the 9900 Wilshire site. However, the precise locations and

activity levels of faults shown on the CGS maps are uncertain due to a lack of subsurface data.

In 2011, Parsons-Brinkerhoff (Parsons) performed a fault study for the Westside Subway Extension to

evaluate the risk of fault rupture associated with the SMFZ and the WBHL in the vicinity of the proposed

Westside Subway Extension stations (the Parsons 2011 Study). The Parsons 2011 Study generated new

subsurface data in the Century City-Beverly Hills area that included continuous-core borings, cone

penetration tests (CPTs), and geophysical surveys; however, trench excavations and soil stratigraphic age

dating were not performed. Parsons’ interpretation of their subsurface data identified a northwest trending,

800-foot-wide zone of faulting along the Beverly Hills – Century City boundary that was interpreted to be

part of the WBHL fault zone. The Parsons 2011 Study also identified multiple splays of the SMFZ, four of

which are located approximately 1,000 feet west of the 9900 Wilshire site that had not previously been

identified.


The Parsons 2011 Study postulated the newly identified WBHL faults and the SMFZ faults were “active”

based solely on the interpreted offset of geologic units at depth and the presumed association with nearby

active faults. None of these newly identified faults were identified on the 9900 Wilshire site. However, the

Parsons 2011 Study shows three WBHL faults projecting in a northwesterly direction toward the southern

boundary of the 9900 Wilshire site and four SMFZ faults projecting in a northeasterly direction towards the

western boundary of the 9900 Wilshire site.

The Parsons 2011 Study potentially affects the 9900 Wilshire site and other commercial, residential and

institutional properties where faults did not previously exist and are now identified as having a potential

fault rupture hazard risk. Two examples of this are the nearby Beverly Hills High School and the 10000

Santa Monica sites where geologists have recently investigated the WBHL faults described above and

concluded that these faults either do not exist or are not considered active.

In 2012, Kenney GeoScience (Kenney) performed independent analyses to “establish a regional geologic

context in which to evaluate the site-specific data being generated” as a result of the recent geologic studies

being performed in the Century City area (the Kenney 2012 Study). The Kenney 2012 Study included

independent analysis of the stratigraphy, geomorphology, and pedochronology of the region and evaluated

the tectonic regime and the location and activity levels of suspected faults in the Century City and western

Beverly Hills areas. The conclusions of the Kenney 2012 Study, as they relate to the 9900 Wilshire site,

indicate that the faults proposed by Parsons as part of the WBHL and the SMFZ either do not exist or are not

active.

Our evaluation of the presence or absence of active faults at the 9900 Wilshire site included an independent

analysis of the Parsons data generated as part of the Parsons 2011 Study for the Metro Westside Subway

Extension. We also reviewed the previous geotechnical reports prepared for the 9900 Wilshire site and

utilized the site-specific data to evaluate the presence of active faults at the site. Available groundwater data

was reviewed to evaluate the presence of groundwater barriers at the 9900 Wilshire site and adjacent sites.

Also, available data from the previous fault studies at Beverly Hills High School and the 10000 Santa

Monica site were utilized in our evaluation as well as geomorphic, structural, and stratigraphic analysis

presented in the Kenney 2012 Study.

Based on the results of our evaluation, it is our opinion that there are no active faults associated with either

the SMFZ or the WBHL present at the 9900 Wilshire site. We conclude that faults identified in the Parsons

2011 Study in the vicinity of the 9900 Wilshire site either do not exist or are not active. Our conclusion is

supported by site-specific soil and groundwater data, soil and groundwater data from the adjacent 9988

Wilshire site, fault investigations performed at Beverly Hills High School and the 10000 Santa Monica

site, and by regional geologic and geomorphic studies by Kenney (2012).


3. SITE LOCATION AND DESCRIPTION

The 9900 Wilshire site is bounded by Wilshire Boulevard on the north, Santa Monica Boulevard on the

south, the Los Angeles Country Club and a private gas station (9988 Wilshire Boulevard) on the west,

and Merv Griffin Way on the east.

The 9900 Wilshire site is currently occupied by an existing parking structure and commercial structure

(former Robinsons May department store). The three-level parking structure has one to two below grade

levels. The three-story former Robinsons May building has one level below the existing grade of

Wilshire Boulevard on the north and is currently vacant.

Topography at the 9900 Wilshire site has been altered by grading associated with construction of the

existing Robinsons May building in the early 1950’s. Current site topography slopes to the south-

southeast and site elevations range from 268 to 291 feet above mean sea level.

Historic topographic maps indicate that elevations at the 9900 Wilshire site in the 1920s ranged from

approximately 270 to 290 feet above mean sea level and the topography sloped gently to the southeast,

toward Santa Monica Boulevard, similar to the existing topography at the site. The historic topographic

maps indicate an active stream channel was formerly present along the along the western property

boundary (adjacent to the Los Angeles Country Club) that followed the natural topography forming a

prominent natural divide between the 9900 Wilshire site and the adjacent properties to the west. An

easement for water lines and a storm drain is located beneath the service driveway along the western

property boundary.

The 9900 Wilshire site is located on the western edge of the alluvial plain that borders the Cheviot Hills and

Beverly Hills on the east. Geologic maps by the California Geological Survey (CGS, 2010), indicate the 9900

Wilshire site is predominantly underlain by Young Alluvial Valley Deposits (Qya). Based on the CGS map,

faults associated with the WBHL, considered the northern extension of the NIFZ, may trend in a northwesterly

direction near the western boundary of the 9900 Wilshire site. Leighton’s investigation at Beverly Hills High

School performed in 2012 (the Leighton 2012 Study) concluded that the WBHL faults do not exist at the site.

Leighton’s conclusions are confirmed by the CGS in a letter dated March 15, 2013 summarizing the CGS

review of the Leighton 2012 Study that indicates that evidence of active faulting associated with the WBHL or

the SMFZ was not encountered within the limits of the high school site. Separately, the CGS map shows the

SMFZ in the vicinity trends northeast and does not traverse the 9900 Wilshire site but traverses the adjacent

9988 Wilshire property to the west. At its closest point, the SMFZ is 180 feet west of the 9900 Wilshire site.


4. SCOPE

The scope of our evaluation included a document review and preparation of this report. The document

review included the technical reports for the previously discussed Parsons 2011 Study, the Leighton 2012

Study, the Kenney 2012 Study, as well verbal communications with the Mr. Jerry Treiman of the

California Geological Survey and other consultants investigating faults in the immediate area. We have

also utilized the stratigraphic age data and other information from our previous fault rupture hazard

evaluation at 10000 Santa Monica (located immediately south of the 9900 Wilshire site at the southwest

corner of Moreno Drive and Santa Monica Boulevard) and our knowledge of the location and

characteristics of faults in the Century City - Beverly Hills area based on other fault investigations for

confidential clients.

Key documents we reviewed as part of this evaluation are:

Geocon West Inc. and Feffer Geological Consulting, 2012, Report of Fault Rupture Hazard

Investigation, 10000 Santa Monica Boulevard, Los Angeles, California, Prepared for Crescent Heights, dated August 24, 2012 Project No. A8928-06-01.

GeoDesign, 2011, Report of Geotechnical Engineering Services, Proposed Tower Development, 10000 Santa Monica Boulevard, Century City Area, Los Angeles, California, Prepared for Crescent Heights, dated December 15, 2011, Project No. Crescent-1-01.

Kenney GeoScience, 2012, Geomorphic, Structural and Stratigraphic Evaluation of the Eastern Santa Monica Fault Zone and West Beverly Hills Lineament, Century City/Cheviot Hills, California, for the Beverly Hills Unified School District, Mr. Gary Woods, Superintendent, 255 South Lasky Drive, Beverly Hills, CA 90212-3697, Job No. 723-11.

Leighton Consulting, Inc, 2012, Fault Hazard Assessment of the West Beverly Hills Lineament, Beverly Hills High School, 241 South Moreno Drive, Beverly Hills, California, Prepared for the Beverly Hills Unified School District, 255 South Lasky Drive, Beverly Hills, California, 90212-3697, Project No. 603314-002.

Mactec, 2008, Report of Geotechnical Investigation, Project Lotus Development, 900 Wilshire Boulevard, Beverly Hills, California, Prepared for Project Lotus LLC, Beverly Hills, California, dated September 2, 2008 (Project 4953-08-1181).

Mactec, 2006, Report of Geotechnical Investigation, Proposed Mixed-Use Development, 9900 Wilshire Boulevard, California, Prepared for 9900 Wilshire LLC, Beverly Hills, California, dated December 15, 2006 (Project 4953-06-1181).

Parsons Brinkerhoff, 2011, Century City Fault Investigation Report, Westside Subway Extension Project, Contract No. PS-4350-2000, Dated October 14, 2011.

Parsons Brinkerhoff, 2012, Response to Leighton Consulting Report, Westside Subway Extension Project, Contract No. PS-4350-2000, dated May 14, 2012.


A complete list of the documents reviewed as part of this study is presented in the List of References

section of this report.

5. FAULT ACTIVITY CRITERIA

The criteria used in our investigation to evaluate fault activity are the same criteria used by the California

Geological Survey (CGS) that define an active fault as one that has had surface displacement within

Holocene time (within the last 11,000 years). These criteria for defining an active fault are based on

standards developed by the CGS (Bryant and Hart, 2007) for the Alquist-Priolo Earthquake Fault Zoning

Program. Faults that have not moved within the last 11,000 years are not considered active.

In general, the activity rating of a fault is determined by establishing the age of the youngest materials

displaced by the fault. If datable material is present, an absolute age can sometimes be established; if no

datable material exists, then only a relative age can be assigned to movement on the fault. For faults that

have evidence of movement in the last 11,000 years, to be included in an Alquist-Priolo fault zone, these

faults must demonstrate evidence of being “sufficiently active and well-defined”.

As indicted in CGS Special Publication 42:

A fault is deemed “sufficiently active” if there is evidence of Holocene surface displacement along one or more of its segments or branches. Holocene surface displacement may be directly observable or inferred and does not need to be present everywhere along a fault to qualify a fault for zoning.

A fault is considered “well-defined” if its trace is clearly detectable by a trained geologist as a

physical feature at or just below the ground surface. The fault may be identified by direct observation or by indirect methods. The critical consideration is that the fault or some part of it can be located in the field with sufficient precision and confidence to indicate that the required site-specific investigations would meet with some success.

6. BACKGROUND

Recent fault studies performed by Parsons for the proposed Westside Subway Extension Project (the

Parsons 2011 Study) postulated that there were active faults associated with the WBHL and the SMFZ in

the vicinity of the 9900 Wilshire site. The faults identified by the Parsons 2011 Study are shown on Figure

3, Parsons Fault Map. The Parsons 2011 Study generated subsurface data in the Century City-Beverly Hills

area that included continuous-core borings, cone penetration tests (CPTs), and geophysical surveys;

however, trench excavations and soil stratigraphic age dating were not performed. Parsons’ interpretation of

their subsurface data identified a northwesterly trending, 800-foot-wide zone of faulting along the Beverly

Hills – Century City boundary that had not been previously identified. The newly identified faults were

interpreted to be part of the WBHL fault zone and postulated as “active” faults in the Parsons 2011 Study.

Separately, the Parsons 2011 Study postulated that there were multiple splays of the SMFZ located

approximately 1,000 feet west of the 9900 Wilshire site that had not previously been identified and were


also postulated as “active” faults. The Parsons 2011 Study postulated the WBHL and SMFZ faults were

“active” based solely on the interpreted offset of geologic units at depth and the presumed association with

nearby active faults. None of the newly identified faults were identified on the 9900 Wilshire site. However,

the Parsons 2011 Study shows three WBHL faults projecting in a northwesterly direction toward the

southern boundary of the 9900 Wilshire site and four SMFZ faults projecting in a northeasterly direction

towards the western boundary of the 9900 Wilshire site.

Prior to the Parsons 2011 Study, there was little to no evidence to support the conclusion that there were

active faults associated with the WBHL in the Century City-Beverly Hills area. This was related to the lack

of subsurface data in the area. There is evidence that the SMFZ is active based on studies west of the 405

Freeway and Quaternary age geomorphic scarps identified by Dolan (2000). However, subsurface data in

the Century City-Beverly Hills area was limited and the location of the faults associated with the SMFZ

were thought to be confined near the geomorphic scarp on the north side of Santa Monica Boulevard.

The Parsons 2011 Study potentially affects the 9900 Wilshire site and many other commercial, residential

and institutional properties where faults did not previously exist and now are identified as having a potential

fault rupture hazard risk. Two examples of this are the nearby Beverly Hills High School and the 10000

Santa Monica sites where geologists have recently investigated the Parsons WBHL faults and concluded

that these faults either do not exist or are not considered active. Other fault studies to evaluate the presence

and activity levels of the postulated SMFZ faults are currently ongoing at several commercial sites in

Century City and Beverly Hills. These projects are being performed for confidential clients and the studies

are ongoing and the results of the investigations have not been made public as of the date of this report.

The locations of known fault investigations in the vicinity of the 9900 Wilshire site are shown on Figure 4,

Local Fault Investigations. The location of the confidential fault investigations that we are aware of are not

shown on this figure due to the private nature of these investigations.

6.1. Local Fault Investigations

Beverly Hills High School

At Beverly Hills High School, a series of postulated “active” faults associated with the WBHL were identified

in the Parsons 2011 Study as traversing the high school campus in a northwest-southeast orientation. The

identification of active faults traversing the campus is of critical impact to the high school as the faults are

located beneath existing school district buildings and could pose a significant safety risk to students and staff.

To investigate these faults, Leighton Consulting, Inc. (Leighton) performed detailed studies in late 2011 and

2012 for Beverly Hills Unified School District that included aerial photograph review, four exploratory

trenches, 21 deep continuous-core borings, 12 cone penetration tests (CPTs) along Durant Drive (Parsons

Transect 4), radiocarbon dating of charcoal samples, infra-red stimulated luminescence (IRSL) dating, and


pedogenic analysis (soil stratigraphic age analysis) of buried soil profiles (the Leighton 2012 Study).

Leighton retained Earth Consultants International (ECI) and Soil Tectonics to provide soil stratigraphic age

estimates. The soils were analyzed in two trenches in the central portion of the campus and one boring (CB-

13) located in the alley between Beverly Hills High School and the 10000 Santa Monica site. The results of

Soil Tectonics evaluation corroborated those of ECI and, as summarized in the Leighton 2012 Study report,

concluded that the majority of the campus is located on an “older geomorphically stable alluvial fan

surface” and soils exposed at the surface of this fan surface are estimated to have a minimum age of between

70,000 and 100,000 years (Leighton, 2012).

According to Kenney (2012), the Leighton 2012 Study attempted to replicate a series of CPT tests along

Parsons’ Transect 4 with their own closely spaced continuous-core borings and CPTs. This confirmation

testing revealed certain discrepancies in the Parsons (2011) CPT data when compared against the Leighton

continuous-core borings and CPTs.

The results of the Leighton 2012 Study indicate the WBHL faults postulated in the Parsons 2011 Study as

being located on the Beverly Hills High School campus do not exist and there is no evidence of any other

active faults at the Beverly Hills High School site. There is direct evidence that faulting associated with

the WBHL has not occurred on that site for at least 100,000 years.

Subsequent to their initial study, Leighton performed supplemental explorations, including an exploratory

trench, in response to the CGS request that Leighton investigate potential splays of the SMFZ identified

in the Parson 2011 Study that may project across the northern portion of the high school campus. During

the supplemental investigation, Leighton did identify a fault in the northern portion of the campus

associated with the SMFZ. However, this fault was not considered active.

Leighton’s conclusions are confirmed by the CGS in a letter dated March 15, 2013 summarizing the CGS

review of the Leighton 2012 Study that indicates that evidence of active faulting associated with the WBHL or

the SMFZ was not encountered within the limits of the high school site.

The locations of the Leighton 2012 Study explorations and the postulated active faults on the Beverly

Hills High School campus identified in the Parsons 2011 Study are shown on Figure 5, Recent WBHL

Fault Studies.

El Rodeo Elementary School

It is our understanding that geologists are currently working at the El Rodeo Elementary School site for the

Beverly Hills Unified School District where the presence and activity levels of faults associated with the

WBHL and the SMFZ are being evaluated. The elementary school site is located immediately north of the

9900 Wilshire site, across Wilshire Boulevard as shown on Figure 4. Based on discussions with Mr. Jerry


Treiman of the California Geological Survey (personal communication 02/25/13) the results of the

investigation at the elementary school site have not been submitted to the state for review as of yet and the

results are not public.

10000 Santa Monica

In response to public comments regarding the newly identified “active” faults by the Parsons 2011 Study

in Century City-Beverly Hills area, GeoDesign, Inc. (GeoDesign) performed an independent analysis of

the Parsons subsurface data in late 2011 to evaluate the existence and activity levels of the newly

postulated faults (the GeoDesign 2011 Study). The location of the 10000 Santa Monica site relative to the

9900 Wilshire site is shown on Figure 4.

The GeoDesign 2011 Study included independent analysis and correlation of boring and CPT data along

Parsons’ Transect 2E, Transect 4 and Transect 7. As shown on Figures 3 and 5, these transects are

respectively located to the north, south and east of the 10000 Santa Monica site. As indicated in the

GeoDesign 2011 Study, correlation of geologic units along these transects indicated that at least the upper

30 to 40 feet of geologic materials beneath the 10000 Santa Monica site were continuous across the entire

property and were not offset by faulting. The GeoDesign 2011 Study also included an evaluation of the

site-specific boring data that supported the conclusion that the on-site materials were continuous across

the 10000 Santa Monica site and not offset by faulting. The results of the GeoDesign 2011 Study indicate

that the postulated “active” faults identified by Parsons do not exist or if they do, they are not active since

they do not offset the upper 30 feet of Pleistocene age soils at the 10000 Santa Monica site.

The GeoDesign 2011 Study was one of the first public documents to challenge the results of the Parsons 2011

Study. Other fault investigations were ongoing at the time but the results had not yet been made public. For an

additional degree of confirmation that WBHL faults did not traverse the 10000 Santa Monica site, Geocon

West Inc. (Geocon) and Feffer Geological Consulting (Feffer) performed a site-specific fault rupture hazard

investigation at the site in 2012 (the Geocon-Feffer 2012 Study).

The Geocon-Feffer 2012 Study included excavation of one continuous exploratory trench across the 10000

Santa Monica site to depths between 18 and 20 feet beneath the existing ground surface. The location of the

exploratory trench is shown on Figure 5.

The trench was excavated perpendicular to the trend of the Parsons postulated faults and spanned the property

in an approximate northeasterly trend. The geologic units exposed in the trench consist of Pleistocene age

Older Benedict Canyon Wash Deposits and localized paleochannel deposits that were logged as 10 distinct

units. Holocene age sediments were not encountered at the 10000 Santa Monica site. The age of the

sediments was evaluated using standard stratigraphic-dating techniques and yielded a minimum age of


between 30,000 and 60,000 years old. The age of the entire stratigraphic section is estimated to be between

208,000 and 345,000 years old.

No faults were observed in the trench at the 10000 Santa Monica site. The Pleistocene age units exposed

within the trench were laterally continuous throughout the excavation and are not offset by faulting.

Based on the age of the oldest sediments exposed in the trench, there is direct evidence that faulting has

not occurred at the 10000 Santa Monica site for at least 208,000 years. The results of the exploratory

trenching corroborated the results of the GeoDesign 2011 Study.

Kenney GeoScience Studies

Kenney GeoScience (Kenney) was retained by the Beverly Hills Unified School District in 2011 to act as an

overview consultant for the recent fault investigations at the various district school sites. In addition to the

overview role, Kenney performed geomorphic, structural, and stratigraphic analyses to “establish a regional

geologic context in which to evaluate the site-specific data being generated” as a result of the recent

geologic studies being performed in the Century City area (the Kenney 2012 Study). The Kenney 2012

Study included independent analysis of the stratigraphy, geomorphology, and pedochronology of the region

and evaluated the tectonic regime and the location and activity levels of suspected faults in the Century City

and western Beverly Hills areas.

The conclusions of the Kenney 2012 Study, pertinent to this evaluation, include the following:

No conclusive evidence has been published that any faults in the Cheviot Hills (Century City area) are active.

Faults associated with the proposed northwest trending West Beverly Hills Lineament- Newport- Inglewood Fault Zone likely do not exist in the study area along the West Beverly Hills Lineament. The West Beverly Hills Lineament resulted from concurrent folding (uplift of Century City) and erosion by the Benedict Canyon Wash that produced a fold-scarp as proposed by Dolan et al. (1997).

Parsons (2011) presumed that many soil layers were essentially horizontal which led to the false positive identification of numerous faults within their West Beverly Hills Lineament -Newport- Inglewood Fault Zone.

Based on the evaluated data, many if not all of the faults within the Santa Monica Boulevard Fault Zone are not active. The presumption that this fault zone is active is not supported by any local data. A number of individual faults within this zone are shown to be inactive by Parsons (2011) and additional analysis provided herein indicates the possibility that the vast majority if not all of the faults in the Santa Monica Boulevard Fault Zone are not active in terms of rupturing the surface during the past 11,000 years as defined by the State of California (Bryant and Hart,2007).


6.2. Summary of Local Fault Investigations Results

Based on the results of these previous investigations, the WBHL faults postulated in the Parsons 2011 Study

are concluded to either not exist or not be active. Also, many, if not all, of the faults identified in the SMFZ

are not active (Kenney GeoScience, 2012).

The results of the fault investigations at Beverly Hills High School and 10000 Santa Monica confirm that all of

the postulated WBHL faults identified in the Parsons 2011 Study investigated by these studies do not exist or

are not considered active. The exception are two potential faults which are presumed to be part of the WBHL

zone of faults identified in the Parsons 2011 Study along Transect 2E (along Santa Monica Boulevard), shown

in Figure 5, as projecting in a northwesterly direction towards the central southern boundary of 9900 Wilshire

site. These faults were identified along Transect 2E by the Parsons 2011 Study and were not indicated as

projecting toward Beverly Hills High School or the 10000 Santa Monica site so they were not investigated as

part of the GeoDesign 2011 Study, the Leighton 2012 Study, or the Geocon-Feffer 2012 Study. However,

cross sections presented in the Kenney 2012 Study present Kenney’s independent analysis of the Parsons’ data

along Transect 2E. Based on Kenney’s interpretation of the Parsons data, these two faults do not exist. The

Kenney analysis of the Parsons data relative to these faults is discussed in Section 10.4 of this report.

7. GEOLOGIC SETTING

The 9900 Wilshire site is located along the eastern edge of the uplifted and dissected Cheviot Hills and

Beverly Hills. The sediments exposed in the uplifted hills consist of Pleistocene age alluvial and fluvial

sediments at the ground surface underlain by Pleistocene age marine sediments of the San Pedro

Formation at depth. Holocene age material is present locally in young drainages and in the modern

Benedict Canyon drainage that defines the eastern boundary of the Cheviot Hills.

The 9900 Wilshire site is located in the area of the modern Benedict Canyon drainage. This drainage is

obscured by urbanization but can be observed on historic aerial photographs from the 1920s and 1930s along

the western boundary of the 9900 Wilshire site. Due to the proximity of the location of the 9900 Wilshire site

to this drainage, Holocene age alluvial deposits are present on a majority of the 9900 Wilshire site.

The Cheviot Hills are located near the intersection of the SMFZ and the NIFZ/WBHL. Figure 2 illustrates

the generally accepted pre-2011 (pre-Parsons 2011 Study) location of these faults zones. Figures 3 and 5

illustrate Parsons’ interpretation of individual faults within these fault zones.

The faulting associated with these two fault zones is complex and historically has been poorly understood

due to the lack of subsurface data and intense urbanization of the area. Until the Parsons 2011 Study, and

cited recent investigations in the Beverly Hills/Century City area, there has been limited subsurface data

to provide a clear understanding of Quaternary faulting associated with these fault zones.


Uplift in the Cheviot Hills has been thought to be related mainly to faulting. However, the Kenney 2012

Study proposes that deformation and uplift of the hills may be a result of folding, not faulting. Based on

interpretation of topographic contours, Kenney (2012) interpreted the uplift of these hills to be a folded

structure, and that the eastern limb of this fold may extend across the WBHL and east of Benedict Canyon

Wash.

The tectonic model for the Cheviot Hills and surrounding area described in the Kenney 2012 Study

postulates that the deformation and uplift of the hills has been on-going since the late Pleistocene. South

of Santa Monica Boulevard, Kenney proposes that the hills have been uplifted along a north-south axis

parallel to the WBHL and Benedict Canyon Wash. Kenney’s model suggests that the Ancient Benedict

Canyon Wash flowed to the southwest and had sufficient stream power to erode the Cheviot Hills as

uplift occurred (Kenney, 2012). Channel incision and the subsequent infilling ceased about 40,000 to

50,000 years ago and resulted in an eastward lateral migration of the Benedict Canyon drainage to its

present-day course (Kenney, 2012).

8. NEWPORT-INGLEWOOD FAULT ZONE / WEST BEVERLY HILLS LINEAMENT

The WBHL is a linear geomorphic feature suspected to be a fault by some geologists and either a fold

scarp or actually nonexistent by others. The WBHL is comprised of east-facing escarpments that separate

the elevated terrain to the west from the gently sloping alluvial surface within the Benedict Canyon

Drainage to the east (Leighton, 2012). The WBHL has been postulated to constitute the northern

extension of the active NIFZ. However, Alquist-Priolo Earthquake Fault Zones have not been established

for this suspected fault because of lack of evidence for being “sufficiently active and well-defined”.

The Parsons 2011 Study provides subsurface information to fill in some of the data gaps along the

WBHL. As previously discussed, the Parsons 2011 Study identified a broad zone of northwest trending

faults in the Century City area, reported to be active based on their assumed relationship with the active

NIFZ. However, the results of the previously described Leighton 2012 Study, the GeoDesign 2011 Study,

the Geocon-Feffer 2012 Study, and the Kenney 2012 Study indicate that all of the postulated WBHL

faults either do not exist or are not active, raising questions regarding their existence and “active”

designation by Parsons (2011).

The Leighton 2012 Study concludes that the northwest trending WBHL faults postulated in the Parsons

2011 Study do not exist at Beverly Hills High School. Leighton (2012) found no evidence that faulting

associated with the WBHL has occurred for at least 70,000 to 100,000 years and perhaps more than

500,000 years. Also, the results of the Kenney 2012 Study indicate that the WBHL faults as postulated in

the Parsons 2011 Study do not exist.


The results of the fault investigation at the 10000 Santa Monica site (Geocon-Feffer 2012 Study) are

consistent with the results of the GeoDesign 2011 Study, the Leighton 2012 Study, and the Kenney 2012

Study. The sediments exposed in the trench are a minimum age of 30,000 to 60,000 years old and the

observed continuity of these gently eastward-dipping geologic units clearly rules out the presence of

faulting within the depth explored.

9. SANTA MONICA FAULT ZONE

The SMFZ is the western segment of the Santa Monica-Hollywood fault zone that forms a portion of the

Transverse Ranges Southern Boundary (TRSB) fault system. The TRSB fault system also includes the Malibu

Coast fault to the west of the Santa Monica fault and the Raymond and Cucamonga faults to the east of the

Hollywood fault (Dolan et al., 2000).

The surface expression of the SMFZ includes fault-related geomorphic features, offset stratigraphy, and

ground-water barriers within late Quaternary deposits (Hill et al., 1979). Research indicates that the

SMFZ is separated into an east segment and a west segment, divided by the WBHL. The east segment of

the SMFZ is not considered active (Dolan et al., 2000; Dolan et al., 1997; Hummon et al., 1992; Ziony et

al., 1985). However, the west segment of the fault is considered active (Pratt et al., 1998; Dolan et al.,

2000).

Urbanization and development within the greater Los Angeles area has resulted in a poor understanding

of the lateral extent, location, and rupture history of the SMFZ. However, the SMFZ is a well-known

geologic feature considered capable of generating earthquakes. The State Geologist considers the SMFZ

as active and prior studies in the West Los Angeles area (at the Veterans Administration Hospital Campus

and University High School) have verified the fault is active in this area. State-designated Alquist-Priolo

Earthquake Fault Zones have not been established for the SMFZ because known active traces of the fault

are only locally defined and have not been identified or well defined for large enough distances to warrant

establishing official fault zones.

The geologic map of the Los Angeles 30’ X 60’ Quadrangle (CGS, 2010) shows the location of the

SMFZ in the Century City-Beverly Hills area is generally consistent with mapping by Dolan (1992,

2000). Based on the CGS map, the Santa Monica fault is located approximately 180 feet west of the

9900 Wilshire site. The location of the fault is discussed in more detail in Section 10.2 of this report.

The Parsons 2011 Study was performed after publication of the previously described CGS map. Parsons

identified four northeast trending splays of the SMFZ along the northern portion of Transect 1 within the

Los Angeles Country Club and Transect 2 along Santa Monica Boulevard, approximately 1,000 feet west

of the 9900 Wilshire site that project in a northeasterly direction toward the western boundary of the

9900 Wilshire site. The general locations of these faults are shown on Figure 3.


The Kenney 2012 Study is in close agreement with the general locations of the four SMFZ faults

identified in the Parsons 2011 Study. However, the Kenney 2012 Study concludes that the four splays of

the SMFZ designated as Faults “A”, “B”, “C”, and “E”, located approximately 1,000 feet to the west and

projecting in a northeasterly direction toward the western boundary of the 9900 Wilshire site, are not

active.

10. DATA ANALYSIS

10.1 General

Geologic maps prepared by the California Geological Survey (2010) indicate that (a) at its closest point,

the SMFZ is located 180 feet west of the 9900 Wilshire site and (b) the WBHL may be present near the

western boundary of the 9900 Wilshire site (Figure 2).

The Parsons 2011 Study generated new subsurface data in the Century City-Beverly Hills area that can

be utilized to evaluate the location and activity level of potential faults associated with the SMFZ and

WBHL. The Parsons 2011 Study was intended to evaluate the risk of fault rupture in the vicinity of the

proposed Westside Subway Extension station locations in the area of Century City and along Santa

Monica Boulevard. The Parsons 2011 Study clearly states that it was not intended to be a stand-alone

study to evaluate the potential for faulting on other sites in the vicinity (Parsons, 2011).

Figure 6A, Site Plan, shows (a) the locations of borings drilled on the 9900 Wilshire site as part of

previous geotechnical investigations by Mactec (2006 and 2008), (b) the location of the SMFZ (CGS,

2010), (c) the location of three postulated WBHL faults shown in the Parsons 2011 Study to project from

Parsons Transect 2E across Santa Monica Boulevard in a northwesterly direction toward the southern

boundary of the 9900 Wilshire site, and (d) the location of a groundwater barrier at 9988 Wilshire

Boulevard and pertinent groundwater monitoring wells.

Our approach to evaluating the presence of active faults at the 9900 Wilshire site was to perform an

independent analysis of the data generated as part of the Parsons 2011 Study for the Metro Westside

Subway Extension. As part of our evaluation, we also reviewed the previous geotechnical reports prepared

for the 9900 Wilshire and that provide site-specific soil information that was utilized to interpret the

subsurface distribution of the geologic units at the 9900 Wilshire site. Data from the Leighton 2012 Study at

Beverly Hills High School, the GeoDesign 2011 Study and the Geocon-Feffer 2012 Study at 10000 Santa

Monica, and the Kenney 2012 Study were also utilized as they pertain to the 9900 Wilshire site.

Interpretations of Parsons’ data, as presented in the Kenney 2012 Study, are presented later in this report.


10.2. Evaluation of the Santa Monica Fault Zone

CGS Mapped Locations

The State Geologist considers the SMFZ as active and prior studies in the West Los Angeles area (at the

Veterans Administration Hospital Campus and University High School) have verified the fault zone is

active in this area. In the Century City-Beverly Hills area, there is limited subsurface data to precisely

locate individual fault traces. In the vicinity of the 9900 Wilshire site, the location of the SMFZ is

generally consistent with geomorphic scarps identified by Dolan (2000). Based on the CGS map, the

SMFZ has a northeasterly orientation and is located approximately 180 feet west of the 9900 Wilshire

site as shown on Figures 2 and 6A. The fault projects in a northeasterly direction toward El Rodeo

Elementary School located across Wilshire Boulevard north of the 9900 Wilshire site.

The location of the SMFZ indicated on the CGS map is an approximate location based on geomorphic

analysis and is not supported by specific subsurface data in the vicinity of the 9900 Wilshire site (verbal

communication, Jerry Treiman, California Geological Survey). Therefore, the location of the fault as

indicated on the CGS map is approximate.

Site-Specific Boring Data

Twelve borings were drilled at the 9900 Wilshire site as part of previous geotechnical investigations by

Mactec (2006, 2008). Also, nine groundwater monitoring wells were installed on the adjacent 9988

Wilshire site by TRC (2009). Figure 6A shows the locations of the previous borings drilled at the 9900

Wilshire site and the locations of two groundwater monitoring wells pertinent to our evaluation of

faulting at the 9900 Wilshire site. The logs of the previous borings drilled at the site are included in

Appendix A. The logs of the monitoring wells drilled at the 9988 Wilshire site are included in Appendix

B.

We utilized the previous boring and monitoring well data to evaluate the presence and activity level of

faults that may project beneath the 9900 Wilshire site. Our evaluation included a detailed analysis of the

lateral continuity of geologic units and consistency of unit contact elevations and groundwater level

elevations to assess if faults associated with the SMFZ are present beneath the 9900 Wilshire site. While

the site-specific borings were intended to evaluate geotechnical characteristics of the on-site soils and

were not intended to evaluate faulting, we are able to use the data to identify contacts between main

geologic units and to assess the continuity of geologic units at the 9900 Wilshire site. The location of our

geologic cross section is shown on Figure 6A. Figure 6B, Geologic Section A-A’, shows our

interpretation of the distribution of the subsurface geologic units at the 9900 Wilshire and 9988 Wilshire

sites.


The geologic section shown on Figure 6B spans the entire 9900 Wilshire site and a portion of the 9988

Wilshire site in a generally north-south direction. As shown on Figure 6B, the geologic units and

geologic contacts beneath the 9900 Wilshire site are laterally continuous and the near-horizontal to gently

sloping geologic contact between the Pleistocene age older alluvial deposits and the Pleistocene age

Lakewood Formation deposits indicates that the upper Pleistocene age materials are not faulted at the

9900 Wilshire site.

There is an abrupt change in elevation of the contact between the older alluvial deposits and the

Lakewood Formation deposits between monitoring wells 2 and 3 (MW-2 and MW-3) on the 9988

Wilshire site. This abrupt change in elevation is suggestive of faulting at this location, approximately 50

to 100 feet west of the 9900 Wilshire site.

Based on the boring data, the shallow Pleistocene age deposits beneath the 9900 Wilshire site are

continuous and not offset by faulting. If faults associated with the SMFZ are present beneath the site they

are confined to the Lakewood Formation or underlying older geologic units and would not be considered

active.

Groundwater Monitoring Data - 9988 Wilshire

As part of our evaluation, we have reviewed available groundwater information for nearby sites on the

State of California GeoTracker website. A change in groundwater elevations or the presence of a

groundwater barrier could be indicative of a fault at that location. Groundwater level data and logs from

monitoring wells installed on the gas station property located at 9988 Wilshire Boulevard, immediately

west of the 9900 Wilshire site, are available on the State website. Based on the available information,

nine groundwater monitoring wells were installed at the 9988 Wilshire site between 2005 and 2008 for

State environmental compliance purposes. At least two of the groundwater monitoring wells are located

within approximately 30 feet of the 9900 Wilshire site western property boundary.

Groundwater elevation contour maps, based on the groundwater level data measured in monitoring wells

in June 2009, indicate there is a groundwater barrier beneath the 9988 Wilshire site. The interpreted

groundwater barrier trends in a northeasterly direction, roughly parallel to and east of the fault trace

indicated on the 2010 CGS map, as shown on Figure 6A.

The June 2009 groundwater levels ranged from 261 to 263 feet above mean sea level to the west of the

groundwater barrier and from 238 to 239 feet above mean sea level east of the groundwater barrier (TRC,

2009). The groundwater levels east of the groundwater barrier are generally consistent with the

groundwater levels encountered in the northern portion of the 9900 Wilshire site in the previous Mactec

borings.


The groundwater barrier location at the 9988 Wilshire site is coincident with the location of the abrupt

offset of the geologic contacts as previously described. We interpret the location of this groundwater

barrier to be the location of the SMFZ. The generally consistent groundwater levels on the 9988 Wilshire

site east of the identified groundwater barrier are generally consistent with the groundwater levels

encountered on the adjacent 9900 Wilshire site providing an additional line of evidence that active faults

associated with the SMFZ are not present east and south of the groundwater barrier. The groundwater

elevation contour map for data collected on June 4, 2009 (TRC, 2009) is presented in Appendix B.

Interpretation of Parsons Data

Parsons’ Transect 7 is located approximately 150 to 250 feet west of the 9900 Wilshire site, in the Los

Angeles Country Club as shown on Figures 3 and 6A. Figure 7, Parsons’ Transect 7, shows the Parsons

interpretation of data collected along Transect 7 which indicates that the geologic units north of Santa

Monica Boulevard are laterally continuous and not faulted to the total depth explored (approximately 75

feet). Considering the Pleistocene age of the sediments encountered, active faults do not intersect

Transect 7 in the vicinity of the 9900 Wilshire site. The laterally continuous sediments illustrated on

Figure 7 are consistent with those encountered at the 9900 Wilshire site by Mactec and corroborate the

site-specific boring data that indicate that faults associated with the SMFZ do not traverse the 9900

Wilshire site between Santa Monica Boulevard and the northern terminus of Transect 7.

The Parsons 2011 Study indicates that their interpretation of data along Transects 1 and 2, located

approximately 1,000 feet west of the site, identifies lateral inconsistencies in the geologic units and faults

associated with SMFZ are interpreted to be present at the locations shown on Figure 3. Our independent

evaluation and interpretation of the data from the Parsons 2011 Study indicate that these interpreted faults

associated with the SMFZ, if they exist, do not offset the shallow Pleistocene age sediments and are not

considered active. Furthermore, the distance between these fault locations postulated by Parsons and the

western boundary of the 9900 Wilshire site is over 1,000 feet. This distance is too great to accurately

project these faults to extend onto the 9900 Wilshire site.

10.3. Evaluation of the West Beverly Hills Lineament Faults

General

The Parsons 2011 Study shows three of the postulated WBHL faults to project in a northwesterly direction

from Transect 2E toward the southern boundary of the 9900 Wilshire site. One of these postulated faults

projects from Transect 2E in a northwesterly direction toward the westerly southern boundary of the 9900

Wilshire Site and two of these postulated faults project from Transect 2E in a northwesterly direction toward

the central southern boundary of the 9900 Wilshire Site. The locations of the three postulated faults as shown


in the Parsons 2011 Study are illustrated on Figure 6A. A cross section depicting the locations of the postulated

faults identified in the Parsons 2011 Study along Transect 2E is illustrated on Figure 8A, Parsons Transect 2E.

The results of the Leighton 2012 Study at Beverly Hills High School and the Kenney 2012 Study indicate that

the postulated “active” WBHL faults identified in the Parsons 2011 Study do not exist. The Leighton 2012

Study and the Kenney 2012 Study included a specific evaluation of the postulated WBHL fault that is

shown in the Parsons 2012 Study to project toward the western boundary of the 9900 Wilshire Site. As

shown in Figures 3 and 5, this fault is also interpreted in the Parsons 2011 Study to intersect Transect 4

(along Durant Drive) and Transect 7 along Moreno Drive, and projects in a southeasterly direction onto the

Beverly Hills High School site to the south. The Leighton 2012 Study and the Kenney 2012 Study conclude

this fault does not exist.

The Leighton 2012 Study did not evaluate the two postulated faults shown in the Parsons 2011 Study to

project from Transect 2E in a northwesterly direction toward the central southern boundary of the 9900

Wilshire Site. However, these two postulated faults were evaluated in the Kenney 2012 Study. The Kenney

2012 Study concludes that these faults do not exist.

Analysis of Parsons Data – Transect 2E

To investigate the three WBHL faults postulated by Parsons to project from Transect 2E in a northwesterly

direction across Santa Monica Boulevard toward the southern boundary of the 9900 Wilshire site, we

reviewed and independently analyzed the boring and CPT data from Transect 2E generated as part of its

Parsons 2011 Study. Figure 8A illustrates Parsons’ interpretation of the CPT and boring data they collected

along Transect 2E in the proximity of the 9900 Wilshire site. As can be seen in Figure 8A, Parsons

postulates that three faults are present in the subsurface that extend within 10 feet of the ground surface.

The Parsons 2011 Study shows two postulated faults that project in a northwesterly direction across Santa

Monica Boulevard towards the central southern boundary of the 9900 Wilshire site and one postulated fault

that projects in a northwesterly direction across Santa Monica Boulevard toward the westerly southern

boundary of the 9900 Wilshire site.

We specifically evaluated CPTs T2E-11 through T2E-24 and borings T2E-B3 through T2E-B5 and plotted

the data from these explorations on cross sections to independently evaluate the data and correlate primary

stratigraphy between explorations. With respect to the CPT data, we utilized the tip resistance and friction

ratio signatures for correlation of the geologic units and identification of major stratigraphic contacts. With

respect to correlating the stratigraphy between borings, we evaluated the detailed soil descriptions and

stratigraphic details on the boring logs and defined primary stratigraphy, fining upward sequences and

buried soils to utilize in our correlation. Our interpretation of the Parsons data along Transect 2E is

illustrated in Figures 8B and 8C, Geocon Transect 2E Interpretation.


The results of our data analysis and geologic unit correlation indicate that the upper 50 to 60 feet of

sediments along Transect 2E, at a minimum, are laterally continuous and are not faulted. Figure 8B shows

our interpretation of the lateral continuity of the subsurface geologic units based on identification of

primary stratigraphy utilizing boring and CPT data. Figure 8C show our interpretation of the lateral

continuity of the subsurface geologic units based on identification of buried soil profiles and fining upward

sequences utilizing boring and CPT data.

As part of the Parsons 2011 Study, GeoVision performed seismic reflection surveys along various transects.

The GeoVision Transect 2E seismic reflection S-wave profile with interpretation is illustrated on Figure 9,

Transect 2E Geophysical Interpretation. As shown on Figure 9, GeoVision interpreted three anomalies

along the seismic profile that could be indicative of faulting. However, such anomalies could also be the

result of other geologic conditions that are commonly observed in this type of depositional environment.

One such condition, for instance, could be localized erosion that could have effectively removed all or a

portion of a continuous layer between explorations.

The locations of the anomalies or stratigraphic discontinuities between stratigraphic units as interpreted

by GeoVision are very similar to the fault locations postulated in the Parsons 2011 Study. One anomaly

interpreted by GeoVision roughly corresponds to the Parsons postulated fault that projects from Transect

2E across Santa Monica Boulevard in a northwesterly direction toward the westerly southern boundary of

the 9900 Wilshire site. The other two interpreted anomalies roughly correspond with the Parson 2011

Study faults that are postulated to project in a northwesterly direction from Transect 2E across Santa

Monica Boulevard and toward the central southern boundary of the 9900 Wilshire site.

It is important to note that the anomalies interpreted by GeoVision shown on Figure 9 do not extend

above a depth of 30 feet beneath the ground surface. Sediments above a depth of 30 feet to within

approximately 10 feet of the ground surface in vicinity of the interpreted anomalies are Pleistocene age

(>11,000 years to 1.6 million years old). This indicates that “unfaulted” and laterally continuous

sediments above the anomalies are Pleistocene age and any faults below the unfaulted sediments are not

active since they have moved within the last 11,000 years.

Our independent evaluation and interpretation of the Parsons data indicate that faults associated with the

WBHL as identified in the Parson 2011 Study do not exist. Our conclusion is consistent with the results

of the Leighton 2012 Study, the GeoDesign 2011 Study, the Geocon-Feffer 2012 Study and the Kenney

2012 Study.


10.4. Kenney GeoScience Interpretations

As previously described, Kenney GeoScience (Kenney) was retained by the Beverly Hills Unified School

District to act as an overview consultant for the fault investigations conducted for BHUSD. In addition to

the overview role, Kenney performed geomorphic, structural, and stratigraphic analyses to “establish a

regional geologic context in which to evaluate the site-specific data being generated” as a result of the

recent geologic studies being performed in the Century City and west Beverly Hills areas (Kenney, 2012).

The Kenney 2012 Study included independent analysis of the stratigraphy, geomorphology, and

pedochronology of the region that evaluated the tectonic regime and the location and activity levels of

suspected faults in the Century City and west Beverly Hills areas.

Pertinent to this evaluation, Kenney re-interpreted the Parsons subsurface data along Transects 1, 2, 2E, 4

and 7. Most stratigraphic and structural analysis in the Kenney 2012 Study focused on boring data

included in the Parsons 2011 Study. As outlined in the Kenney 2012 Study, two approaches were used: 1)

correlating geologic contacts and stratigraphy from boring to boring and 2) identifying and evaluating

fining upward sequences to identify soil marker horizons. Some of the other information utilized in the

Kenney 2012 Study to correlate stratigraphy are concentrations of manganese oxide, iron oxide, and

carbonate deposits and argillic clay horizons.

The Kenney 2012 Study geologic map (Surface Geology and Fault Map of the Century City Area, Plate ES-

1a) is shown on Figure 10, Kenney Geologic Map. The Kenney geologic map identifies four traces of the

SMFZ, previously identified in the Parsons 2011 Study approximately 1,000 feet west of the 9900 Wilshire

site, that project in a northeasterly direction toward the western boundary of the 9900 Wilshire site. These

four faults are designated by Kenney, and shown on Figure 10, as faults “A”, “B”, “C”, and “E1-E2” for

discussion purposes. The following are excerpts from the Kenney 2012 Study that summarize Kenney’s

discussions and conclusions regarding the activity level of these four postulated faults.

Fault A is at the northwest end of Transect T1-8 (Plate KGS-T1) within a small south flowing drainage inside the Los Angeles Country Club property. Parsons (2011) extended Fault A to the surface within their older Alluvium of Pleistocene age (Plate ES-2a). As shown on Plate KGS-T1, the fault appears to offset San Pedro Sequence and Cheviot Hills Deposits. The apparent offset is reverse (1 to possibly 3 feet) but likely experienced more right-lateral slip based on marker bed separation across the fault. The upper offset Cheviot Hills Deposits beds are approximately 500,000 years old; penetration indicates that Fault A has been active since that time. Plate KGS-T1 shows that Fault A does not displace the base of the older Benedict Canyon Wash Deposits, which is an estimated 150,000 years to 200,000 years old. Further, one channel basal erosion surface in the lower Benedict Canyon Wash Deposits is not offset. This indicates that the last identifiable surface displacement of Fault A took place between about 150,000 to 200,000 years ago. Fault A, by California definition, is therefore not active.


Fault B occurs at the northwest end of Transect T1-8 and about 15 to 50 feet southeast of Fault A. Neither Kenney GeoScience nor Parsons (2011) identified this fault elsewhere. Parsons (2011) showed that Fault B does not offset Pleistocene fluvial deposits, and concluded that Fault B was inactive. Kenney GeoScience analysis of Fault B shows that the last displacement probably took place after-500,000 years ago. Based on un-faulted basal erosion surfaces within older Benedict Canyon Wash Deposits, which is an estimated 150,000 years to 200,000 years old, Fault B is inactive.

Fault C is identified at the northwest end of Transect T1-8 approximately 90-feet southeast of

Fault B (Plate KGS-T1), at the southwestern end of Transect 2-2E (Plate KGS-T2), and presumably in Transect T3 of Parsons (Parsons, 2011). This is also shown on Plate ES-2b. Parsons (2011) shows Fault C extending upward to within just a few feet of the surface on their Transects T1 and T3. Fault C dips northwest and generally exhibits approximately 13 to 14 feet of apparent reverse displacement of the upper contact of the San Pedro Formation. On Transects T-1 and T-2 (Plates KGS-T1 and KGS-T2), Fault C extends upward to within 38 and 25 feet of the surface respectively measured from the original surface (i.e. not including artificial fill). On Transect 2 (Plate KGS-T2), Fault C displaces the base of the Cheviot Hills Deposits by approximately 22 feet in an apparent reverse sense but does not offset overlying soil marker B within the Cheviot Hills Deposits estimated to be 500,000 years old. In Transect T1 (Plate KGS-T1), the base of the Cheviot Hills Deposits is not identified but members of the Cheviot Hills Deposits below soil marker horizon B are offset. Also in Transect T1, soil marker horizon B within the Cheviot Hills Deposits and immediately below the older Benedict Canyon Wash Deposits is either offset a few feet or gently folded. Fault C in Transects T1 and T2 does not offset the base of the older Benedict Canyon Wash Deposits estimated to be 150,000 to possibly 200,000 years old. These data indicate that Fault C offsets Cheviot Hills Deposits thus allowing it to assist in producing the Santa Monica Boulevard Lineament, but was inactive once erosion and deposition occurred associated with the older Benedict Canyon Wash Deposits. These data indicate that the Santa Monica Boulevard Lineament resulted from faulting, but that the scarp is a relict dominated by depositional and erosional processes and that Fault C is not active.

Fault E1 was identified by Parsons (2011) to extend to a depth of approximate 45-feet

(measured from the current surface with artificial fill) and not offset a member of their late Pleistocene older alluvium. Thus, Parsons (2011) indicated that this fault is not active. These findings are consistent with the evaluation herein as shown on Plate KGS-T2. Fault E1 is shown to terminate upwards below an erosion surface within members of the older Benedict Canyon Wash Deposits. As illustrated on Plates KGS-T1 and KGS-T2, Fault E1 was active during deposition of the older Benedict Canyon Wash Deposits but become inactive during continued deposition of the older Benedict Canyon Wash Deposits. Fault E1 offset the upper contact of the San Pedro Formation and base approximately 20 feet in an apparent reverse sense. The base of the older Benedict Canyon Wash Deposits may be offset by a reverse apparent displacement by approximately 31 feet, but this estimate is in question due to difficulties in evaluating the true limits of the lower contact of the Benedict Canyon Wash Deposits locally. However, the discrepancy of apparent vertical offset between the San Pedro Formation and base of the older Benedict Canyon Wash Deposits (20 feet compared to 31 feet respectively) may very well be an indication of lateral slip across this fault. Based on these data, Fault E1 is not active.


Fault E2 was identified along Transects T1-8, T2, and T3 (Plates KGS-T1, -T2, and -T3). Plate ES-2b shows the surface projection and northwestward dip of Fault E2. The fault offsets the top of the San Pedro Formation approximately 12 feet in an apparent reverse displacement. The base of the older Benedict Canyon Wash Deposits is displaced approximately 22 feet by apparent reverse displacement which is greater than that observed by the San Pedro Formation either due to strike-slip motion or difficulties in the ability to identify the base of the older Benedict Canyon Wash Deposits. However, Fault E2 offsets basal members of the older Benedict Canyon Wash Deposits approximately 10 to 15 feet vertically and likely was active during deposition of the Benedict Canyon Wash Deposits and Cheviot Hills Deposits. This is supported by the observation that the older Benedict Canyon Wash Deposits thickens and the Cheviot Hills Deposits thin within the E1 and E2 fault zone. Based on these transect data, it is possible that a depression/channel was created during Cheviot Hills Deposits deposition, then a soil pedon associated with soil marker horizon B was able to form at the surface within the depression at the top of the Cheviot Hills Deposits. This surface was subsequently faulted and overlain by the older Benedict Canyon Wash Deposits. Thus, as will be discussed for Faults F, F1 and F2 in the next section, Fault E2 assisted in the creation of the depression that deformed the 315T-300T fan-terrace approximately 150,000 to 200,000 years to allow the ancient Benedict Canyon Wash to flow through the Cheviot Hills (Figure 10, Plate ES-16) .Parsons (2011) shows Fault E2 extending nearly to the surface. Based on Plates KGS-T1, Fault E2 may extend to within 11 to 12 feet of the ancient surface (measured from the base of the artificial fill), which represents older Benedict Canyon Wash Deposits that are a minimum of 40,000 years old. On Transect T2 (Plate KGS-T2), Fault E2 is shown to split (similar to Parsons, 2011), but the fault does not offset a fining upward sequence basal erosion surface at depths of 34 to 38 feet deep as measured from the base of the artificial fill. Based on this interpretation, Fault E2 is not active.

Figure 11, Transect 2E – Kenney Interpretation, illustrates Kenney’s re-interpretation of the Parsons data

along Transect 2E that specifically evaluates the presence of the postulated WBHL faults. As can be seen

in Figure 11, Kenney does not interpret faults to exist along Transect 2E and does not agree with Parsons’

interpretation that three postulated WBHL faults project from Transect 2E, across Santa Monica

Boulevard, toward the southern boundary of the 9900 Wilshire site. The same is true when comparing

Parsons 2011 Study Transect 4 interpretation and the Kenney 2012 Study interpretation of Transect 4 as

shown on Figure 12, Parsons Transect 4 and Figure 13, Transect 4-Kenney Interpretation, respectively.

The conclusions of the Kenney study, pertinent to this investigation, include the following:

Faults associated with the proposed northwest trending West Beverly Hills Lineament- Newport- Inglewood Fault Zone likely do not exist in the study area along the West Beverly Hills Lineament. The West Beverly Hills Lineament resulted from concurrent folding (uplift of Century City) and erosion by the Benedict Canyon Wash that produced a fold-scarp as proposed by Dolan et al. (1997).

The Benedict Canyon Wash has had a significant defining role in the Cheviot Hills region

since the late Quaternary. Today, it is a northwest-southeast trending drainage that has contributed significantly to the erosional and depositional patterns that in addition to local uplift contributed to the creation the West Beverly Hills Lineament. In the past, the Benedict Canyon Wash flowed southwest across the northern edge of Century City and


through the Cheviot Hills. Parsons (2011) did not identify the older Benedict Canyon Wash Deposits (BCWD) in terms of their geologic significance.

The primary fault zone in the study area occurs in the general vicinity of Santa Monica

Boulevard, and is referred herein as the Santa Monica Boulevard Fault Zone (SMBFZ). The Santa Monica Boulevard Fault Zone is defined as a series of faults that trend parallel to Santa Monica Boulevard between the Mormon Temple through Century City and into western Beverly Hills (Figure 3). Faults within the Santa Monica Boulevard Fault Zone predominantly dip steeply toward the north and likely exhibit primarily right-lateral displacement with local secondary reverse and normal displacement dependent on their strike within the zone (i.e. local restraining and releasing orientations). Our findings regarding the general location of these faults are in close agreement with Parsons (2011) however Kenney GeoScience is in disagreement regarding the kinematic role of the Santa Monica Boulevard Fault Zone and its potential age.

Based on the evaluated data, many if not all of the faults within the Santa Monica Boulevard

Fault Zone are not active. The presumption that this fault zone is active is not supported by any local data. A number of individual faults within this zone are shown to be inactive by Parsons (2011) and additional analysis provided herein indicates the possibility that the vast majority if not all of the faults in the Santa Monica Boulevard Fault Zone are not active in terms of rupturing the surface during the past 11,000 years as defined by the State of California (Bryant and Hart,2007).

The conclusions of the Kenney 2012 Study, as they relate to the 9900 Wilshire site, indicate that the

WBHL and SMFZ faults that are shown in the Parsons 2011 Study as projecting toward the 9900

Wilshire site either do not exist or are not active. The Kenney 2012 Study does not identify active faults

projecting toward or at the 9900 Wilshire Site.

11. CONCLUSIONS

Based on our evaluation, active faults associated with the Santa Monica Fault Zone and the West Beverly

Hills Lineament are not present at the 9900 Wilshire site.

With respect to the Santa Monica Fault Zone, we conclude this fault is located west of the 9900 Wilshire

site. Our conclusion is supported by multiple lines of evidence that include:

The California Geological Survey (2010) mapped location of the Santa Monica Fault Zone is

approximately 180 feet west of the 9900 Wilshire site. Identification of a groundwater barrier on

the 9988 Wilshire site indicates the fault is present at that location and not at the 9900 Wilshire

site.

Continuity of stratigraphic units in a northwest-southeast direction, based on analysis of site-

specific boring data, indicates the geologic units are laterally continuous at the 9900 Wilshire site

and are not offset by northeast trending faults.


No faulting was observed along Parsons’ Transect 7, north of Santa Monica Boulevard. This

supports the on-site boring data that indicates that active northeast trending faults are not present

on the 9900 Wilshire site.

Geocon and Kenney (2012) both conclude that the Parsons data along Transects 1 and 2 do not

support the conclusion that active faults associated with the Santa Monica Fault Zone are present

along these transects. Therefore, active faults do not project in a northeasterly direction from

Transects 1 or 2 toward the western boundary of the 9900 Wilshire site.

With respect to the three faults of the West Beverly Hills Lineament postulated by Parsons to project in a

northwesterly direction toward the southern boundary of the 9900 Wilshire site, we conclude these faults

do not exist. Our conclusion is consistent with the conclusions of the GeoDesign 2011 Study, the

Leighton 2012 Study, the Geocon-Feffer 2012 Study, and the Kenney 2012 Study that indicate that the

West Beverly Hills Lineament faults identified by the Parsons 2011 Study either do not exist or are not

active. Similar to our evaluation of the Santa Monica Fault Zone, our conclusion is based on multiple

lines of evidence:

Our independent analysis of the Parsons data along Transect 2E and correlation of primary

stratigraphic units, fining upward sequences, and buried soil profiles indicate the three West

Beverly Hills Lineament faults postulated in the Parsons 2011 Study to project in a northwesterly

direction towards the southern boundary of the 9900 Wilshire site do not exist.

GeoVision’s seismic reflection profile interpretation along Transect 2E identifies three anomalies

that may be fault-related or may related to other geologic conditions. Even if these anomalies are

faults, they do not project within 30 feet of the ground surface and do not offset the shallow

Pleistocene age sediments and would not be considered active.

Analysis of the data collected in deep continuous-core borings and CPTs as part of the Leighton

2012 Study along the Parsons 2011 Study Transect 4 (along Durant Drive) indicate the geologic

units are not offset by faulting.

Kenney’s re-interpretation of the Parsons data along Transects 2E, 4 and 7 indicate that the

geologic units along these transects are not affected by active faulting. The Kenney 2012 Study

concludes that the West Beverly Hills Lineament faults do not exist in the study area.

Based on these lines of evidence, it is our opinion that that there are no active faults associated with the

Santa Monica Fault Zone or the West Beverly Hills Lineament that are present at or extend into the 9900

Wilshire site.

Project No. A9009-06-01 April 22, 2013

LIST OF REFERENCES

AMEC, 2012, Final Report of Geotechnical Consultation, Proposed Revitalization of the Beverly Hilton-Phases I and II, 9876 Wilshire Boulevard, Beverly Hills, California, prepared for Latham & Watkins, LLP, Los Angeles, California, dated May 24, 2012 (AMEC Project 4953-12-0141).

Bryant W. A. and Hart, E. W., 2007, Fault-Rupture Hazard Zones in California, Alquist-Priolo

Earthquake Fault Zoning Act With Index to Earthquake Fault Zones Maps, California Division of Mines and Geology Special Publication 42, Interim Revision 2007.

California Geological Survey, 2013, Second Fault Rupture Hazard Review, Beverly Hills High School,

241 S. Moreno Drive, Beverly Hills, CA, CGS Application No. 03-CGS0960, letter dated March 15, 2013.

California Geological Survey, 2010, Geologic Compilation of Quaternary Surficial Deposits in

Southern California, Los Angeles 30’ X 60’ Quadrangle, A Project for the Department of Water Resources by the California Geological Survey, Compiled from existing sources by Trinda L. Bedrossian, CEG and Peter D. Roffers, dated July 2010, CGS Special Report 217, Plate 9.

Dibblee, T. W., Jr., 1991, Geologic Map of the Beverly Hills and Van Nuys (South ½) Quadrangles,

California, Dibblee Geological Foundation Map DF-31.

Dolan, J. F., Sieh, K., and Rockwell, T. K., 2000, Late Quaternary Activity and Seismic Potential of the Santa Monica Fault System, Los Angeles, California, Geological Society of America Bulletin, Vol. 112, No. 10, October 2000.

Dolan, J. F., Sieh, K. E., Rockwell, T. K., Guptill, P., and Miller, G., 1997, Active Tectonics,

Paleoseismology, and Seismic Hazards of the Hollywood Fault, Northern Los Angeles Basin, California, Geological Society of America Bulletin, Vol. 109, No. 12.

Dolan, J. F. and Sieh, K., 1992, Paleoseismology and Geomorphology of the Northern Los Angeles

Basin: Evidence for Holocene Activity on the Santa Monica Fault and Identification of New Strike-Slip Faults through Downtown Los Angeles, EOS, Transactions of the American Geophysical Union, Vol. 73, p. 589.

Dolan, J. F. and Sieh, K., 1992, Tectonic Geomorphology of the Northern Los Angeles Basin: Seismic

Hazards and Kinematics of Young Fault Movement. Exponent Failure Analysis Associates, 2012, Hazard Assessment Study, Westside Subway Extension

Project, Century City Area, California, Prepared for Aaron Kunz, Deputy Director of Transportation, City of Beverly Hills, 345 Foothill Road, Beverly Hills, CA 90210, dated February 7, 2012.

Geocon West Inc. and Feffer Geological Consulting, 2012, Report of Fault Rupture Hazard

Investigation, 10000 Santa Monica Boulevard, Los Angeles, California, Prepared for Crescent Heights, dated August 24, 2012.

GeoDesign, 2011, Report of Geotechnical Engineering Services, Proposed Tower Development, 10000

Santa Monica Boulevard, Century City Area, Los Angeles, California, dated December 15, 2011, Project No. Crescent-1-01.


LIST OF REFERENCES (Continued) GEOVision, 2011, Final Report, High Resolution Seismic Reflection Survey, LA METRO WESTSIDE

SUBWAY EXTENSION PROJECT, Los Angeles, California, GEOVision Project No. 10500,Prepared for AMEC Environment and Infrastructure, dated October 14, 2011.

Hill, R. L., Sprotte, E. C., Chapman, R. H., Chase, G. W., Bennett, J. H., Real, C. R., Borchardt, G., and

Weber, F. H., Jr., 1979, Earthquake Hazards Associated with Faults in the Greater Los Angeles Metropolitan Area, Los Angeles County, California, Including Faults in the Santa Monica–Raymond, Verdugo–Eagle Rock and Benedict Canyon Fault Zones, California Division of Mines and Geology, Open File Report 79-16LA.

Hoots, H. W., 1930, Geology of the Eastern Part of the Santa Monica Mountains, Los Angeles Basin, in

Shorter Contributions to General Geology, U.S. Geological Survey Professional Paper 165. Hummon, C., Schnieder, C. L., Yeats, R. S., Dolan, J. F., Sieh, K. E., and Huftile, G. J., 1994, Wilshire

Fault: Earthquakes in Hollywood?, Geology, Vol. 22, pp. 291-294. Hummon, C., Schneider, C. L., Yeats, R. S., and Huftile, G. J., 1992, Active Tectonics of the Northern

Los Angeles Basin: An Analysis of Subsurface Data, in Proceedings of the 35th Annual Meeting of the Association of Engineering Geologists.

Jennings, C.W. and Bryant, W. A., 2010, Fault Activity Map of California, California Geological

Survey Geologic Data Map No. 6.

Kenney GeoScience, 2012, Geomorphic, Structural and Stratigraphic Evaluation of the Eastern Santa Monica Fault Zone and West Beverly Hills Lineament, Century City/Cheviot Hills, California, for the Beverly Hills Unified School District, Mr. Gary Woods, Superintendent, 255 South Lasky Drive, Beverly Hills, CA 90212-3697, Job No. 723-11.

Leighton Consulting, Inc, 2012, Fault Hazard Assessment of the West Beverly Hills Lineament, Beverly Hills High School, 241 South Moreno Drive, Beverly Hills, California, Prepared for the Beverly Hills Unified School District, 255 South Lasky Drive, Beverly Hills, California, 90212-3697, Project No. 603314-002.

MACTEC, 2008, Report of Geotechnical Investigation, Project Lotus Development, 900 Wilshire Boulevard, Beverly Hills, California, Prepared for Project Lotus LLC, Beverly Hills, California, dated September 2, 2008 (Project 4953-08-1181).

MACTEC, 2006, Report of Geotechnical Investigation, Proposed Mixed-Use Development, 9900 Wilshire Boulevard, California, Prepared for 9900 Wilshire LLC, Beverly Hills, California, dated December 15, 2006 (Project 4953-06-1181).

Parsons Brinkerhoff, 2011, Century City Fault Investigation Report, Westside Subway Extension Project, Contract No. PS-4350-2000, Dated October 14, 2011.

Parsons Brinkerhoff, 2012, Response to Leighton Consulting Report, Westside Subway Extension Project, Contract No. PS-4350-2000, dated May 14, 2012.


LIST OF REFERENCES (Continued)

Pratt, T. L., Dolan, J. F., Odum, J. K., Stephenson, W. J., Williams, R. A., and Templeton, M. E., 1998, Multiscale Seismic Imaging of Active Fault Zones for Hazard Management: A Case Study of the Santa Monica Fault Zone, Los Angeles, Geophysics, Vol. 63, No. 2.

Shannon & Wilson, Inc, 2012, Preliminary Review Comments of Century City Area Fault Investigation Report, Westside Subway Extension Project, Century City and Beverly Hills, CA, dated March 8, 2012, Project No. 51-1-10024-003.

TRC, 2009, Quarterly Groundwater Monitoring and Sampling Report, 76 Station 0702, 9988 Wilshire Boulevard, Beverly Hills, California, dated June, 2009.

Yerkes, R. F. and Campbell, R. H., 2005, Preliminary Geologic Map of the Los Angeles 30’ x 60’ Quadrangle, Southern California, 1:100,000, USGS Open-File Report 2005-1019.

Ziony, J. I., ed., 1985, Evaluating Earthquake Hazards in the Los Angeles Region–An Earth Science Perspective, U.S. Geological Survey Professional Paper 1360.

TI1E OEOGRAPHICAL INFORMATION MADE AVAILABl..E FOR DISPLAY WAB PAO\llDED BY CJOOOLE EARTli, Sl&ECT TO A UCBllSNO AOREEM:NT. TI1E IN~TION IS FOR l.LU9TRATIVE PLH'OSES OM.Y; IT IS NOT INTENDED FOR a.JENT'& USE Oft RBJANCE NO SHAU. NOT BE Rel'AODUCED BY aJ91T, CUEHT SHALL INDB.NFY, DEFEND AND Ha..D HARMLESS GEOCON FROM ANY LIABLITY INCURRED loS A RESULT OF SUCH UBE OR RELIANCE BY CLIENT.

GE OCON W E S T , I N C .

GEOTECHNICAL •ENVIRONMENTAL• MATERIALS 3303N.SAN~BLVD.,STE100 • UBANK, CALIFORNIA 91504 PHONE 818.8.41.8388 • FAX 818.8411704

t N

SCALE: 1 • "' 3000

VICINITY MAP

9900 WILSHIRE BEVERLY HILLS, CALIFORNIA

GK I AML I I DSK/GTYPD DATE 04 - 22 - 2013 I PROJECT NO. A9009 - 06 - 01 I FIG.1

O' 1000'

Reference: California Geological Survey, 2010 2000' 3000' 4000'

SCALE 1·-2000•

0 ~ !%<¥.~ ~ G 0

MAP UNITS

Lale Holocene (Surflelal Deposits)

Artificial Fill • de-po&lta ol r1 reaullng from human coMtruction. mining, or quanylng actM!ln: Ind.KM• •f'gif'lffJed flQ kw buiding• roada,. dlmt., •irpol1 ruf'M'lys, harbor ffcHil!H, 1nd wall• '-n.1111

Undltlt rt ntl11ttd &u rtlc:lal Otpoth• • i"°"'*• oom.ivllll"l'I. elope wtith, lfk.it dtP"-4 .. 1rw olhtr t1.11ffot dspolltt ot tll tQtl. wentftt)' unconeoMdttld but io.:a~ mty co nt1ln COMOldlttd lly•ri.

L..-nd1did• Oepositl. - m1y isldude dlblis !low. and older andllidts of various. Hrll matefi1l and movemenl types: onoontofidatell 10 lfto)derat:ety weU-eontolldal•d

B•Kh Oepo11ts - uncof'IKlidltMI m1rlnt btt<:h M411mtf111J '°"""'inV moltfy or flM· 1AC1medium"91t ined, well40!1td und

ArluvMll WHh o.potlts . llr'ICOMOlldt1td •.oot ani Qtl\ldy .. dlm•nl dllpoNl'd Iii rlCl'lltJ' IC::UYI ChlMtl• of ltrums aod mo,,._ may contain too• to modlr1Qtfy loc:M und end lily und

AUuvJ.11 Fan Depo•iia: -unoon&Olidated boulder.._ oobbles, gr11V~I. w nd, and lllt retenUy ~i1ed v.ttere 1 Wtr Ot SCtNm inue• rrom t eonfll'ltd v11ty or ~n;on: t•bmtnl tyl)lef!ly ~td Int rtn4htl)t4 cont, pwly M<11menl ;t ,.,,.,more domln1nt thtn Mrdy M«limtnl

Al luvl.11 V• Hty Otpotil.1 • unooMOlktllecl °'9y . .... •Rd. Ind grevtl reotnti,i Ot~td p111111110 toe.llZ.td M..-t1m 'lllltyt e"Ct.'01 tprttd MO•• 1eglon1tty OlltO e lkNltl llltt of ler9tf rtYer vent.,._ •ndy Mdlment o-nerelly more domi111.M tnin pvtl'f M<flr'IWf'lt

n waee Deposits • lrdldK mafine ancl atream lerrtee ctepoua. marine deposits incfude lllghtly 10 rnoderlltl'f con10klattd ard btOdtd gr11v•l •nd OO<QIOm«•t•, Mild Ind llnd1ton1, tndllill llllld .-11one; HYtf terrtet O.l)Ollt• coneht of ur'ICOfttO!ldtltd thin· to ttllek·btddtd .......

L.eu11rkte, PWiy• • .nd 1!1Cu1rtne {Parlolk:) C>f.potlll • mot11'f unoontOlkaltff ~·~d umd, .UC. mud. and day from trHh w1ter (ltcultrine) .. k .... uMne (pleyt) dly ltkH lhll •~ periodcalt ilooded, •nd nl\llrltt, dtpot.ilt n"IY oonteln N• end OChtr •vl l)Gliltt

EOiian and Dul'lt Deposits . unc:o""°'ldltecl, g.en•rally -•-t0rted Mid-blown NM. ma,- occur•• <line form• or Wet t1nd

Holocene 10 1..a,te Pleistocene (Surflclal Deposits)

YQUrtg Alh,1vial F•n Deposits · ul'IQOtltOliclatt<l IO lit#ltfy COntOlidl!td, ur'l<titM<:toel 10 Slgtltty di$ttcl td boulder, cobble, grawel, aa9d,. 100 _.. depoalt-a lawed kor. 1 oodlnecl valley or caryon

Vou"Q Alluvi•I V11l .. y Otpo1l11 • unoo~idiltd lo .ilghlly cortt01id1tecl, undi1Md.td 10 llightly dinecMd Cl•y. till tll'ld, and or•vtl 1lt>ft0 tMlttrn 'llllty• •nd • llln'lll ""' Of llrgt r rtYtfl

Late to Middle Pleistocene (Surf'.clal IDeposlts>

Old Alluvl•I Fi n O.po1h1i - aligtltfy to moder•t•ly conlOlkl•l•d. modt111t9fy diliaed~ boulder, cobbt•. Oftvtl, NM. •nd liltdtposift Qut<ll from• eon6ned v•llty °' unyon

Old Alluvl•I V•ll•)' Otpoillt • "IOtMI~ 10 mo6tftttft C<H"lllOlileltt•d. modtrt llly dltMClltd Clliy, 8111, Mf'WI. ~f'WI Qf•vtl aklr'lg lllHm ull•Y. end tluvlel 1111• ol 'etgtot rtY•,. O l d Terrace Oeposils • lllOhlt)' bO rnoderatety contolldatfl'd, mode11tely dl&Seeted 1T1arinl! aM atream tur1oe depo1b

Old l..Cul lrine, Pit /I, t tld Etlu•l'ine (P•rllie) Dtp0tlt • • '*'Ol'ltl)' 10 modetlltly C<H"llO ld11ta1. l'fl06t<1tely ~Ant~•~ •NI, till, mud, Ind city trorr 611Ct, p1ty1, 1ne1 tlllut*'t c1tpo1M1tc lv1r1out typet

Middle to Early Pleistocene (Surtlclal Deposits)

!J• ry Old A_Hwlal Ftn oei:osits • rnootrattl'J' to wt1l<0M011d11.:1. l'ligl'll'f diMtetttl bol.iwtr, cobOll. gtavel. 111J'ICI, •nd till O.potitt ""-ltd lrOm • eonll~11tllt) «ctiyon

V•r)' Old Alh1<At l v11ey Dtpo1l1t . moot<1tttpo towttl«ntOl~tled, hlQl\1'/ dlMt<:led Olly, .... Mnd. tnd IJ"tytl ti(Nlg llltttm ·11lltY1 Ind ell1Nllll llltt Of itrgtr rtYt ra. 9entt1t; upl11ltd •ncl Hforll'lecl

Quaternary (Bedrock>

CmrH'ii!r•iMd fonNtion• of P lel1loc:tM 1g41 Hd younogtt. primtrily Mnd*>• anocongllom9111t1

Pint.gr•lntd fomwiUontel PNbloctoe 11gt1nd (OUfliler • lrlttudtt ftnt.gtlMCI .. ndteont. ellMOnt. l'IW<IMOne, lhllt, Ill~ 1nd celelreout Mdlm•n'•

Tertiary (Bedrock)•

C01rat'ii1r11lrnt<I TtrUtry 1191 f011ma11ons • prim.lrll,- Mnc1Mo11t • nd eonglOmtrate

F~1t.gt1lntd Ttftllll)'lft IOtmlllol'IJ - lncll>Ott ftnt.gra~ Ml'ICIM011t, """°"' l'l'IUOMOnt, ehtll, llllctout Md c.letrtout MCtimtntt

Tertluy age fonnalions of volcank origin

GEOLOGIC MAP


DATE D4 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG. 2

GE OCON W E S T , I N C.

GEOTEGINICAL • ENVRONll&ITAL • MATBUALS

A~~llve W'e,M Beverl~ Hiiis 1111e111n1eril1I ··· 1Naw~1ar1-111u1awnn111~au1111 ~011 a

Actl~ei SEllUH Momica Fa~ 1I~ ,~m11a

(FAULT ZONE PROJECTS TOWARD NORTHERN

PORTION OF SITE)

TRANSECT2

SIMI MO"lo,n Fnult Zone llfoloocna A~tlvlty U"d1t1 n1~1111d

·Ce1nury Cit~ Conatell 1tl an Ste tlmu

.:... ....-~

11

r /' ]:' I

_T_RAN_S_E_C_T-2E-_ _5

•

f1euM zone area ' • ~aun trace

f'hlhn llN!) f11.utt1oce'l:io11s shown ara. ma.In lt ~$and ad<litionaJ faults and ~round dnfomiad:on exist betweefl IM fat1lc: h ~I~!':: shown.

a· 200· 400· 600· aoo· SCALE 1•-400'

GEOCON LEGEND

-- ........ EXPLORATION TRANSECTS (PARSONS, 2011)

PARSONS - FAULT MAP

9900 WILSHIRE BEVER.LY HILLS, CALIFORNIA


GE OCON W E S T, I N C.

GEOTEGINICAL • ENVRONM&.ITAL • MA TBUALS

o· 2so· soo· 1so· 1000· SCALE 1·=500'

TIIE GEOORAPHICAL INFORMATION MADE AVAii.Aiii.£ FOR DISPLAY WA9 PROVIDED BY 00001.E EARTII, SUBJEl:T TO A LICENSING AGREEMBllT. THE INFORMATION 18 FOR IU.US'TRATIYE PURPOBES ONLY; IT 19 NOT INTENDED FOR CLIENTS U8E OR RELIANCE IHJ BHALL NaT BE REPRODUCED BY Cl.JENT. a.IENT SHALL NlEMNFY, DEJ'EN)AND HClD HARMLES& GEOOON FROM NN LIABILITY INCURRED AS A REBUL T OF SUCH USE OR RB.WICE BY Cl.JENT.

LOCAL FAULT INVESTIGATIONS





0 • 100·

EXPLANATIO_N ___ -i

Fa~Jlt I QVlisl lgs-!lon: , •1 re ni>1::ot ~roflle Line , ..__ l

_ T.;.;.l _Hl-'ll ii.-- P·WSV\'I l3t1ls1nlc l~etl~\:ll<Jri 11e l I with Shot Point Numbe· (Sh~n evarv so re'1lt)

CPT SOllllJ.llll!J l<JCt.illOl 1

COhtll'tUOUs core Boring L¢O• loo t and Tctal Depth Drilled

Approxlrmito Zoo~ or filau lt lr11.1 . " II • Uncertain, Oct. 14, 2011 Flrnlt Loc:Jliclll, Out!111:~d v1 ' t:Ht

' • ~<mo ~~port . Refined based ' Feulc ~oc~tlori , Querl,~GJ Vl/Mr1~ Uncertain.

- ?- un New l. !!IQl\1011 Dull>!, i.;U1 ttit1I Report

Ge~Ct\lll K:al 6g{I Gas Investigation: .

Lit Rotary-Wash Boring Location G.2UG ,,.,,

CPT S<1\11l(li11!) I ocr1tl1.1n

~115 Sonic Core Loce1tl0t1 - .

. . ·1 II 1964· 196r; 1969. Borln 0 Local:lo11 { l.11R ciy c. i um a , . 71·A71'1174 1~71 ; ·108'1)

~t!~~~l .~.~~ll ln1rast19a~!~ il ~oollnllOLI S Coro Borlr\1:1 t ocmtlon ~e-~1 u -·

l"il\'1' 1~ ,A CPT $oync11na locEltlon

1 1 Ttench l.oeetlol'l

I- _ ...., -I Cron-$e.;tlon ~oi:."tlQt1

Gt11p bl'llWtnm I elgtrlon I 1wni I res

Fa~J!UI!;!..~~: - centsill11 e clfT1aoks

::. - _..:, Cros s. l'1as.saDa& (Approxh nal:e)

- - , , C lr.11'1 Over Outline l\ill tt111!Ulvtoi Sl11 t1 (l11 w11, I • , .... i •111 ....,11 '""'it "'!o!., ,...., M"' t drlled

N(>ie t.119·1111!) r,r•n. nni:;I ~(,)fl 11gr, 011 111 Trtlllt•Mt!l 'flere no I

RECENT WBHL FAULT STUDIES


DATE 04-22-2013 PROJECTNO. A9009· • 06 01 FIG. 5

GE OCON ~ w E s T , I ~VICWNMENTAL • MAT~LS GEOTIOtNICAL •

f I .. ;. • "' f,. ~ : t: fs .

f

/ -~./

,, ... ... PARSONS TRANSECT 7 , . / '- ___ . .r-

I . -l ... ;~ .... ,.~

,. ........ - ·. ·-...... ... _'\_/°"-

l I

I I )

/" ..... ..!

.....

., •'

· ·:···-~•-.c.?'.ntt ,-.

I

-' I

I I ;

I

. ... ..

o' 50' 100' 150'

SCALE 1·= 100'

/ /

// / -17-- ~ - .._

& PARTNERS LLP.

LEG ENO:

8·12 • BORING LOCATION AND NUMBER (~CTEC, 2008)

200'

?- - - •? SANTA MONICA FAULT (CGS, 2010)

A A' •----1 LOCATION OF GEOLOGIC CROSS SECTION

MW-3@ MONITORING WEU. LOCATION AND NUMBER (TRC2009)

SITE PLAN

. ..... , ...... ___ -... 9900 WILSHIRE BEVERLY HILLS, CALIFORNIA

··--... .. ··- DATE D4 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG. 6A



A 300

:::i" I'/) 250

~ z 0 -.... < > w ....I 200 w

150

N 38°W)....

r~~,:ri::;:i::::========:::::i::========::::i::::=:=::=:==:i:::=====990o-w~1~HIRE~====:::::i:::========:::i::::=:======~========i~=====,--~--BLW

B

A' 300

L--L __ L __ 1----

Older Alluvium (Qoal) -------11---------

--------~ ________ J_ ________ J_ _______ _

0 100

Lakewood Formation (Qlw) (Predominantly Silt and Clay)

200 300 400

DISTANCE

500

- ---------___. Older Alluvium (Qoal) j --------------~-~~ ~r-· -------------- • C"' <:::------ ----..._ 1

--~--- ----' I SAND 1 I

-· ------ -------- --------·~-------- ---------+--4------

600 700

Lakewood Formation (Qlw) (Predominantly S(lt and Clay)

C"• I I I

J ----,-----i-----,-----i-----,----

800 900 1000 1100

:I 260 I'/)

~ z 0 -.... < > w

200 ....I w

160

GEOLOGIC CROSS-SECTION A-A' SCALE

VERTICAL: 1• = 50' HORIZONTAL: 1" = 100'

GEOLOGIC CROSS SECTION AA'


DATE 04 - 22 - 2013 PROJECT NO. A9009 - 06 - 01 FIG. ee

GE OCON W E S T. I N C.

GEO'IEOINICAL • ENVIRONMENTAL • MATERIALS

Transect 7 NW \..

Beverly Hiii& --ii--Century City (Los Angeles)

Santa Monica Boulevard I ntarsection

U. ~ =:::imf _I_

w Qfo

w Qe

(./) =:Mc: Qe

'1:1 ===?

9900 WILSHIRE (Southern Portion of Site)

Loa An1i19lea Country Club

Qfon -ae,~

-- - ? --.p.p-._....;.,___.

Qe Tl'.lo!'f

NW '

~ ~~~-+-~~~-+-~~~--+~~~~.f--~~~+-~---1~~

~ ~-? --7 --?

--?

-? -?

-?

180

NOTE: Parsons Transect 7 Interpretation as Presented in Parsons (2011) Report

PARSONS TRANSECT 7


DATE 04 • 22 • 2013 PROJECT NO. A9009 • 06 • 01 FIG. 7

GE OCON W E S T , I N C. GEOTECHNICAL • ENVIRONMB'llT AL • MA TCRIAl.S

J ..

1D T4'

I'

-

I ~uttl Moreno Dr1ve

lnte1"18ctlan

Century City (Los Angeles)

L--_ _.., __ Beverty .. Hiiis ~

- ' ~

l L

~ -1= ?

-

1D:t1CI"

?=== - 1- ~?-

r= r ~l -

Qe 'ID• 11M'

Qe

~ Ce

-Qe

9900 WILSHIRE (Approximate Limits)

Qe

- I

Qfc

I_

?

NOTE: Parsons Transect 2E Interpretation as Presented in Parsons (2011) Report

PARSONS TRANSECT 2E


DATE 04 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG. 8A

~ GE OCON W E S T, I N C.


l..

I'

L -

I ...

11)• 74'

Century City (Los Angeles)

I ~uttl Moreno Or1ve

lnteraectlon

CPT DATA CORRELATION TO A DEPTH OF AT LEAST

60FEET

9900 WILSHIRE (Approximate Limits)

--l-..._ ~·'FAuL': DONOT::ND /t ~ -..........___ WITHIN FEET OF _/

--? · GROUN SURFACE ? ~ --,-

Qe

Qe

:t i--~ ? === - I - Ce

~?- - Qfo

-- - - 'F r l Qe L-2. --

?

NOTE: Re-Interpreted Contacts Based on Correlation of Primary Stratigraphy

GEOCONLEGEND

--- ........ STRATIGRAPHIC CONTACT

GEOCON TRANSECT 2E INTERPRETATION


DATE D4 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG. 8B



'IDs ,ar

I 1= FAULTS D WITHIN

l.. ? GROUN

? '!le: Qe -

I' ?=== ~ - Ce

L ~?- -- -- - - 'F r l Qe

Qe

- I

Qfo

L-2.

ID•ll'

FAUL TS DO NOT EXTEND --·-· ~-...::i.-WITHIN 50 FEET OF

GROUND SURFACE

?

NOTE: Interpreted Contacts Based on Conelation of Buried Soils and Fining Upward Sequences.

GEOCON LEGEND

~ ........ BURIED SOIL

GEOCON TRANSECT 2E INTERPRETATION


DATE D4 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG. BC



SW I' Ill 11 II~

H11

LEGENlJ T2E·B3 ~ ~

li!t·B1 .. ,~ 1 ~ ~' l l!llJhl~l ll~ !! l 1UI~ I ~•IJ111~1 '~ 11 1(11 !11 U1m1hul IJ11 1111.

l~1)11d1r.h I nmt~1on

Tj_ ~\ IQmli1 I Im~ l 1 1 111 r11~(~i11u ~lr~h t l111h,1 ~111111111 1

- - ?

hrnll hilt.1110~ rn 1 a1~!11111 ~~ llt~f.jlm I 111111~t1l 1111 u• V1 1 m ~I Ott els 11f Ml1j11I ~{offlrir: 1r.11~ ern lf~1 1 S l~11Hh:rn ll l,f1 I~ 1111 rn1'11111il~ h1 11\ lllHih ll Al11p lllrnl (M1~l1rn l wlls1 1 1~ 1 1 ,1 j)1 1.111 lrn,1ll~ 1j11E 1lm' wl10~11l11 1rn1h1 11t )

I~ Ill

eo1 001 1001 S EISMlt STA rlPN

l1l~~h~ I l'>ljoj~r1t111111 1111ir11 lrn11ll'tly liml 1 11 1~ I! uh1~1l11 J:ielllllli Ml ~li111 ~h •1 1~ ~ 111111: ILlvnl WIH~ Ii 11 IOJ!IOllJI

'""' "" f"11ri 11 wr «1fttn111 ~ ' i)1plllt All\ llfl11f11Nlfml!I lilll llll1ty\11llyJ1y~tM1

I ~I 111

N J ~I 1111

POSTULATED FAUL TS BELOW A DEPTH OF 30

0

FEET - 20

40 "' ~ w u.J

60 !6. :c:

80 I-Cl. w

-100 0

T20 ~ 140 ~

x 160 0

0::: 180 CL

11. <(

TRANSECT 2E-GEOPHYSICAL INTERPRETATION


DATE D4 • 22 • 2013 PROJECT NO. A9009 - 06 - 01 FIG.9



Lo (litr()I'\ of P~t'S(.)t\!) (2011 ) t rarise<:t

Exte 11slon of Pa rson6 (201 'I l tn.1Mor.1 (this i.~udyJ

~1n~ l l lrlli111 r.ry chl'lll l1el wit 1in ti\'! ('h~\llo1' 1 1111 ~ with likely Holoce11e 119~ sedir1'1a11ts

P1HJll C: ~pp1>t1H~ to e)(l1lblt approximately 11 S•fee t of reverse apparent $eparatlon

r~a ~lits DI it ncl 02 rri<1y be cross fo u Its betwCJ011 Ft111lt$ <;, e 1 ~nc;I E2. Dip offa1~ l ts Dl ~nd D~ Is ~mkovy11, and li'rnY E~xhlbrt 11fi~ti rent riaverse or 11om~al $~i.;i11 1•atlo1\. Fi.ults 01 ~ 11d D2 1~<:1t observed 111 Tra11s~c t T l.·13 ..

· t~litmtin frtm1 a1·11 tn1 v1 i ~ it!vprs11 '1 p : . ; 1)orr;i,rnl ~k>11g . ~<111lt F'sq~~e1$ ~s

i' ,f ~ti,er11 1 1no1lon (>'w 1rre1.t ~1;r1i$~ 1 1 fa It' o 1e

c Santa Monica BoulE!vard Faul~ ~~>n~ (SMBFZ);

' '

Santa Monica F1;1u't Z(me of Dolan ahd Sit h (1992); Older Bl!n~diczt

Ca11yon Wa5h , , Deposits (BCWO)

Reference: Kenney GeoScience, 2012

CHD

Fillllt B lik(lly ll~l1<:tl\IO (l'a rs(')m, io ·1 ·1 ) a11d thiG Stl!dy

BCWO

I

I I

I

' I

~2 ·· 1 I

~

BCWD t 11111 111"1' t I

II Ir.

/ *"" -1\p'proxirrnt~ /..,; loci.nlon of Sari

Pedro Formation "k11ol>" shown by Par5ons (201:2; Flg ure 2A) /

/

I i i I l' I I

T1·S

O'

CHD 11 I

200'

I

T~-~E I I I

YO.•ff.lg~t 'eene~lct c~~yon Wash'dep~slts ~v,rlyll'ig ! 11 older Benedict Canyon I Wash deposits.

I I

II

'

\

P1op1)S¢<;l Co11~lella li911 ~lvd. Stat1011

'lo,ooo

400' 600' 800'

Symbol Descriptions

r.:::;-;::J Younge< Benedlcl ~ Canyon Wash Deposits

~ Older Benedk1 r::..:::J Cans-on Wash Deposits

II CHO I Cheviot Hills Deposits

\ SS'\

\ \

Apr>roximate stwface µroi@ction location o( touhs in the study area. Bohl number lndicates esthnated amount of vc1tlc al scparMion across the la ult measured al the top of theS.n Pedro Formation (maidfflum displacement)

j\\\. lndlwes right-l•teral '\ ,y fuult displacement

~~~,~~tt~,~gra~~~~n~ U •nd D Indicate up and down.sides respectively.

•lndiates apparent D/ reverie dlsplacemenl

aGroS!. fault. ~ U and D indicate up and

1 O down sides respectively

Blue Oashod Lines: l1uerpreted deep

'

faults Identified on t~e geophysical seismic line data

I of P1trsons (2011). F• ults •ppear robe deeper than the Parsom (2llll)CPT and Bo~ng data.

Green Das~ed Lines: A11e1 n~tlve Interpretation nhls m1dy1 for correlation of

I geophy;kal seismic line faults between transects. Partly based on steep dip al

'

~oull~N5tem Transect 7 1sce Plate ESl 2), whkh may

• bedue1o loulllng,anda 'ub1u1fM:e"'knob"'ln the San Pedro formation surface ~howo on Parsons Plate 2A 12012).

KENNEY GEOLOGIC MAP





.o11 ,

21+00 22+00

o'

o·

9900 WILSHIRE

Qeb ---·-- Qeb

23+00 24+00

20' 40' 60' 80'

~77CAL SCALE 1· 40'

40' BO' 120' 160'

HORIZONTAL SCALE 1• BO'

These soll pedo~~.:'1:.:'~~1~ review by KGS during c at Parsons. Q

~

25+00 26+00 27+00 28+00

ce. Kenney Referen · GeoScience, 2012

SANTA MONICA BLVD. l! ALONG r Likely min. ~40,000 year old soil ~

r;:

29+00

NE

•20

TRANSECT 2E . KEN NEY INTERPRETATION

9900 Wl~~~RNIA BEVER.LY HILLS, FIG.11

A9009. 06. 01 DATE " PROJECT NO. ~~ D4 22 -2013

GE OCON W E S T , I N~ONM&.ITAL

GEOTEGINICAL • E

i'-----------------9900 WILSHIRE-----------------.1

Transect 4 outh Mereno

Drtve lntersecllcn

NE

"' . ... ~ 1g ~

NOTE: Parsons Transect 4 Interpretation as Presented in Parsons (2011) Report

Along Durant Drive

D .. .. ~ ~ ~

~ I ~ j ... ~

lD• tar -......... ,..

I

-____ ,..

7+00

~

-~ ~ ~~

119i''M 5" I: H~:1""11CF

Vll-:1"-11!'

~

Ii! ~

~ ~ ~~

?- -

NE ' -aoo . ~

! ~ ~ g ~~

·- -

11+00

~ I

- -- -- ~-120

r PARSONS TRANSECT 4


100

DATE 04 - 22 -2013 PROJECT NO. A9009 - 06-01 I FIG. 12

~ GE OCON W E S T , I N C.

GEOTKHNICAL • ENVIRONMENT AL • MA TCRIALS

~------- 9900 WILSHIRE ----------i

SW ~.,. ~ ,! Ill

/ 400

380

260

--240

• ... ?

220 "t.! f''

200 .. :;; . . u :J-

180 "

" 160

140

120

SAN 100

C6

Pars~hs ~t.11 1) W.w dav1rly Hills Lh1eitmld1t • New1>ort-lnfJ leW(>O\I Fir.~lt loh4

(red blotks Ind icat., npptmdmate loci.tlon o; f"u Its)

C:S (1~ (' I ('/ TR ANSPOSED r n LOr.s

I I II I

1,1

PEpRO FIR MAI ON

so1..L-'~--L-----y-----~~---.--~-'--; · ---'"1.--:"""", 'll ' l~f\~

Mm o\1 , ... .... Geoloqlc Descriptions Note~

C l~Y (CL o r CH)

U11it contains clay

Cl11:1vel member

Ui lit contains gr av~

S llt (ML) - not colored

Reference: Kenney GeoScience, 2012

Proposed WBHL .. Newport Inglewood faults likely do nQt ex ist If th~ sedimentary units are assumed to dip toward the NE.

UpwMd f l ~Ht~nlng of progr~ssively younger s~dlt114t)tS slJgges1tS that roca l folding may pr~~~ntly b~ "stabht (in-active).

Modified frorn Parson$ rep<::irt d~·l'tod 10. 1 4.~0 1 ·1, Figures L-1 O and L- '11 (Tra 1~sect 4).

See Plate ES·2a for 1rcOlSec;t4 l t) (.;atk~ t 11

i .••

1-• !~· \'Ill

1 '

_J

,.,

.: ·: ~·6W< I ~

• ' ·~ .... ,.,.J ~1·• ,..,. _ i!IJ'J

'"

o· 25· 50' 15' 100· --=-:::::::::Ii--===

o·

\£71CAL SCALE 1·= 50'

50' 100' 150' 200'

HORIZONTAL SCALE 1"m:100'

TRANSECT 4- KENNEY INTERPRETATION


DATE 04- 22- 2013 PROJECT NO. A9009 • 06-01 FIG. 13


GEOTIOtNICAL • ENVIRONMENTAL • MA T~LS


APPENDIX A

BORING LOGS - PREVIOUS MACTEC REPORTS

9900 WILSHIRE BOULEVARD

~ E-< ~ * 0 BORINGl '-'

~~ ga:? E-<

I>: 5 a- $g 3 OIU.J '-' 0 :i: Cl)

~~< ...... !5 !-< c ffi <fi' O"' ~ E-< ;::..ffi en "Cl C) :;:: DA TE DRILLED: August 29, 2006 oo::i ~ !il ........... o& ~.£ ~ co f- ~ z P-j o o

~ EQUIPMENT USED: Hollow-Stem Auger 11.< 06

0"'0 ~ Cl : f3 ~ ~- < HOLE DIAMETER (in.): 8 IU :Z: Ill '-' Q .-l en oQ"° Ul

(/) t:Q ElEVATION: 288.0** E i:: >-o~~ SM FILL - SILTY SAND - slightly moist, light brown,. some roots

68:i: ~t'j~ o< ~~z 285 O ::> Ul 15.0 113 19 CL -..u.I~nEi>o§ffSTo~f-----------------"'ILi

~~~ (SAND~AN CLAY) - stiff, moist, dark brov.'.D, trace gravel

5~ 5

z~s 0 -i::: I: . SC. SILTY CLAYEY SAND - medium dense,. moist, dark brown, fine to ~o"'· 280 13.2 105 .:: SM mediwn, ~e gravel · · · g~~ .zz!-i .g 0 uJ

10

~~~ · 33x 13.7 113 14

CL LEAN CLAY - stiff, slightly moist,. brown, q-ace.gravel

~~~ IU ~ "- 275 ~o~ ~~~ "'gJ·~ . 15

60~ · 17.1 111 22 E::E .. ~2.ffi 8~~ 270 IU...) ~ ML -OLDER-ALLUVWM«:5iiiO'i- - ..., - - - -- - - -;-- - ~ - .- -~ .... SANDY SILT· moist, light brown, some gravel, some layers of sand ~sf/)

20 with gravel · ·

~-~~ . ·gig<

~ m ~ CL L"EAN CIA Y, stiff to bard, moist, ~rown, trace gravel

z ~ 265 g · -~ ~l!lw 17.9 ].12 26 <i:'"' ·t!; ~~Q 25 , ..

! ~~ ·~ IU ii: . . reddish.brown and gray i f- a.. i ~~~- 14.1 119 75 1· !:!~ I ~cnfil 260

1 · ~§§ I 30 I ~5~ i - ~~~ ' filo< :x: rn

ol;l)Z 255 uzo

~~~ grayish bro\Yll fa<O Pg3 35

.. ... ~ <:! SANDY SILT· very moist to wet, light· brown, some clay .. ML

~ 250

~ SM SILTY SAND - mediwn dense, sligb~y moist,.brown, fine

~ 40

Field Tech: GMC ii! Prepar¢'By.· SS

~ (CONTINUED ON ·FOLLOW.ING FIGURE) Checked"~y: ' h'/' ;; Project Lotus Development

llMACTEC LOG OF BORING N 9900 Wilshire Boulevard iii L -Figure: ·A-1.la ~ ·Bever! Hills California Project 4953--08-1181

g £-< ~ *

~ $ 2 !§~ ~~ §a .._, ,_.) E; (/.)

~ ~ <ffi iii 1? 0 Cf! P-l E-< (/.) "O

. ~~ ,_;j

tis ?' p... ........... 08

~ zci oo ~ 5 Q = E-< ~~ ·o .._,

r/'i ~ A ~ (/.)

P-l

235-

230-

225-

-~ 65 -+--1----1----1...:_--+--l

BORING! (Continued)

DATE DRILLED: August 29, 2006 EQUIPMENT USED: Hollow-Stem Auger HOLE DIAMETER (in.): 8 ELEVATION: 288.0**

SW -D.K:EwoonFORMATI6N16if--------------WEU... GRADED SAND - dense, moist, gray, line to coarse, some silt and gravel

layers of cl~y fro~ 46 to 4S feet

5l . .. less ~ilt, wet

END OF BORING AT SO FEET

NOTES:

Ground water measured at a depth of 48 feet (inside augers) 30 minutes after completion of drilling. Boring backfilled with soil cuttings and tamped.

* Niimber of blows required to.drive Crandall sampler 12 inches using a 140 pounds hammer falling 30 inches.

"""Elevation was detenuiued from Alta/ACSM Survey h:fap {dated 11/18/04) by PSOMAS . · . . . .

Field Tech: GMC ._ § Prepared By: SS

· ;f-~--:::.--:--~....,--=~-:--~~~~-r-~~~~~~~~~~---.~~~~~-C-beck~ed-B~y.~.~~.p;~~----l ·;.: ·Project ~otus Development .~ · L·QG OF BORING. . .a; 9900 Wilshire Boulevard ~ MACTEC : ~L-----==B~e~v=er~l.,_,,vH=i=H~s.~C~a~li~·~~o~rn:=:ia::..-_ _ ....i.. __ _;_ ______ _ __ -1..~Pro~~~·ec~t:~4~9~53~-~08~-1~1~81=---~F~i~gm:=..:e~: ~A~-~1.~1~b~

270-

260-

255-:

250-

15.7 112 . 27 18

DATE DRil..LED: EQUIPl\-ffiNT USED: HOLE DIAMETER (in.): ELEVATION: 286.0*"'

BORING2

August 30, 2006' Hollow-Stem Auger 8

ALi)JVfALDEPOSITSTo~j----------------LBAN CLAY - stiff to very stC, slightly moist, dark gray, some roots, · trace gravel

SILTY SAND -.medium dense, slightly inoi~t, light brown, fine, trace gravel · ..

SILTY CLAY - hard, slightly moist, dark brown, some sand, trace gravel

45 , ~ - 15 -t----11----t----t--+-l:~l'lt:t:IXIXI

CLML

' 19.5 105 37

12.5 115 21

31 : 11.9

60

.. ML · ... . lll:i : . .. DO!.•, •

.. : ·.

. . ML · . ... · :

151s.". ' . • ~ ...

· ~

.. .. .. SM·

OL'DEilA'LLuVffiM©~~------~----------

sANDY SILT - pard, slightly moist, brown, trace gravel

SILTY SAND - medium dense, slightly moist, dark brown, fine to medium, fow gravel, ·trace clay

SANDY SILT- stiff, slightly moist, brown, trace gravel

LEAN CLAY - ~arc!, slightly moist, dark brown, tr.ice gravel

SILTY SAND - very dense, slightly moist to moist, brown, fine, some gravel, some clay · . · · ~ {:;. ::-

...... 35 -+----lf----+----+--~vAI . ·:: ;· " L- '• • •• :·. ... .. .. ..

·:. : ": . l'v1L SILT - very stiff, slightly moist to moist, brown, some clay

Field Tech: GMC

.. ~ Prepared By: SS - (CONTINUED.ON.FQLLOWINGFIGURE) . CheckedBy:h{~ ~l-----=--.--:...,.,.--;-.... ~-;----:----i----------..,.----""---.-------__:_~~:£.LL,_. ___ --1 .. Project Lotus Development #~ LOG QF B. QRING ~ 9900 Wilshire Boulevard f!//MACTEC . ~1-----=B~e~ve~r~lv.i....=Hil='~ls~·-~C~a~li~·fi~o~rm~·~a'---~_._-~~~~--~--------LP_ro~~~~~t:_4_9~53_-o~s_-l_I_81 ___ ~F~·i~gur:.:.....:.e~:~A~-~l.~2~a~

., s 15 I> a:: E c3: I')

"> I

~ ~

ri ()

~

i oi

4 :I: 0

t .... OI

i .I')

R

~ J "' ~ ~ 0

"' OI

~ 6 ~ ~

~ ! 6 ... '2 .. .Q

e ~ ~

t ~ ] .c; g. a Cl .:J

PROJECT NO.:

LOCATION:

Cl a:

w _J

a. :E < en

157903 DA TE DRILLED:

76 Station 0703 LOGGED BY:

9988 Wilshire Boulevard APPROVED BY:

Beverly Hills, California DRILLING CO./RIG:

~ DRILLING METHOD: 10-inch Diameter Hollow Stem Auger .....

; SAMPLER TYPE: 5-foot Core Barrel 0

j:!:~ TOTAL DEPTH: 46 feet DEPTH TO WATER: 32 feet

a.~ ~ ~ DESCRIPllON

.__ -40 SANDY GRAVEL: very dark gray (SY 3/1), dense, wet, coarse-gralned sand, :... I\.. fine aravel some medium-arained sand trace fine-aralned sand. :_ SlllY GRAVEUSAND: very dark gray (SY 3/1), medium dense, wet, - medium- to coarse-grained sand, fine and coarse gravel, some clay . .__

0

~ --... 1-45 -,__ .... -,_ ---... 1-50 --,_ -,_ -... ,__ .... 1-55 -,_ .__ ... ,__ ... -,_ -60 .... -.... ,__ .... ---._ '--65 .... ---------70 ---... ,__ ... ,__ ... -75 ... I-... I--I-... ,__ .... ---ao

CTRC LOG OF EXPLORATORY BORING

March 24, 2008

J. Nordenstam, P.G.

J. Nordenstam, P. G.

Cascade[CME-85

(!) 0 ..J

(.)

I (/) o_ (.) <( (/) a:: ::> (!)

WELL CONSTRUCTION

------~

50----

------

55----

------

60------

-.--65-

---------

70---------

75----

------80-

DETAIL

MW-9 PAGE 2 OF 2

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