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Ms. Shirley McDougall Executive Secretary City of Pleasanton 200 Bernal Avenue P.O. Boi< 520 Pleasanton, CA 94566

Dear.Ms. McDougall:

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September 25, 1981

We are placing on open file the following report, reviewed and approved by the City of Pleasanton in compliance with the •:1<,quist-Priolo Special Studie• .Zones Acti

Geologic and fault iJl' .. 'estigation report, .SPRR property, Hacienda Buaine•• Park, Pleaaanton, Califo'n!ia; by Wahler Aaaociatee; August, 1981.

EWJ!/map

ce: A-P file

Sincerely yours,

EARL W. l!AR't Office of the Stat<1 Geologist CEG 935

(Oll''W @If 1})11~#\~~[MII@lro AREA CODE 415 846-3.202 -:· 200 BERNAL AVENUE

September 23 / 1981

Mr. Earl Hart 1009 Ferry Building San Francisco, CA 94111

RE: Wahler Associates HBP-109A

Dear Mr. Hart:

P. 0. BOX 520 -:- .. PLEA:;ANTON, CALIFORNIA 94566

Transmitted herewith is the above-referenced report along with the comments of Dave Carpenter, Engineering Geologist, R.G, #248 for your files.

If you have any questions concerning this transmittal, please feel free to give us a call.

Yours truly,

.- I . . .· ---~ . - . }d:. .( ' . ?1u (/'in' .' "'shi~'1e~D ugall "7 -e:L

Executive Secretary

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Enclosures

Ha Shirley Mc!Doupll Elc.ecutive Secretary City of Pleaaantcm, l"lannins Dept. P.o. Box sao Plf!1tsonton, CA 914566

Dear Ma McDoupll 1

Septfi!lllber 21. 1981

In aoonl'dance with yoUX' l'eque•t, I have rev.:tewll'd the Geologic •nd F•ult lnveatigation Re.port preparad by Wahler A••ocist•• for the southern Pacific Railroad Co. prQPerty. The r!Niew consisted of a careful atudy of the subject ?'l!pQrt and a brief site inQJO­tion.

The subject report 1• baffd upon ebundnnt geolog:l.o data developed by Wa.hler AseQCiatea during their study of the S.P.R.R. eite 1tnd 11n adjaaent property. The report 11chieve11 a level of det•il not often seen in geotechnical etud:l.es fol' non-ar!tical i'•cilitie:i.

No geologic fqtu.l"ea suggestive of faulting were aeen in qx,plor­atoey trenoheit ll!Xoavated in eiluvial depoe1tlll that range in age from 3925 t 185 years to st least 9770 * l!OO year.a. The trenohllfs croaaed po•sihle looetions of •tr.ands of the postulated Pleasanton hult.

Therefore. it 1• my profese1.onal c>pinion that the report p:ra­pared by Wahler As•ociatea conforn1• to the requirements of the Alquia1:-J'riUlu Ao~. Othe1• engineering geologic iteme pertinent to the auhject site are adequately di111cu&aed. the l'epOTt nu1y be aceepted by the City of Plaunton •• • baaia for fut11n1 action• pertaining to the proposed project.

Ae noted previouely, the Wahler Aaeoeliates report contains con­siderable geoloaic inforntation. 'l'he informatiOfl includes two eurly Holocene radiocarbon dates with good stratigraphic: control. Thia data is of potential value to the Cal1forn.1u D:l.vieion of Mf.nes and Geology d.ur~ ite preefl!Jlt evaluation of the postulated Plesaimton FeW.t. l agree with Hr. John J. Henegban. wahltt A111sOC!iate111. that a oopy of the report should be Hlit to CDKG aa llOOD •• t>Ohibl• eo that they will be J[Ware of !ta conteata prior to January 1. 1982 when the final reviaed Speciul Studies zone •P of the Dublin Quad• rangle is scheduled to be !asued.

Ms Shirley McDougall -2- September 21, 1981

Costs for this review are $150.00. Please forward the enclosed copy of this letter to the Purchasing Agent as a billing for this 9mount to be charged to P.O. 8258. I have appreciated this oppor­tunity to provide geological review service for the City of Pleasanton ancl woul.d be plea sad to do so again if desired by the City.

Very truly yours,

(\ .'': \ ) JJ n ........ ~···.·~-;\ J ...

David W. Carpenter Engineering Geologist R,G. #248 CCE.G. #135

cca'TI'w ©rf IPLL~~~~rrotr@rro AREA CODE 415 846-3202 _,_ 200 BERNAL AVENUE

Septewber 14, 1981

Mr. Dave Carpenter 41882 Mahoney St. Fremont, CA 94538

Dear Mr. Carpenter:

P. 0. BOX 520 -:· PLEASANTON, CALIFORNIA 94566

RE: Wahler Associates Project HBP-109A

Enclosed is a Geologic and Fault Investigation report for the recently acquired SPRR Property for the Hacienda Business Park for Prudential Insurance/Callahan Pentz Properties, Pleasanton, California dated August 1981.

Would you please advise the amount of time and fees to be charged for this review at the earliest possible time.

Thank you.

C'#v ·/,.~, J;;~tU'J!__ Shi.~i'eY,; /&'bouqal)" Execut ve Secretary

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Enclosure

• ~~ GeorgoB. Fin~ Jac~G. Wullf

Chartes W, Perry

.&.'1 \Al hi As • .j. JohnL.l-o•""Y ~ yyQ er SOCIC1es JooephLMarzai< ---------------------------------- JosephJ.Kulikowski

Geotechnlcal Engineering Forroot w. Giffo'tl

September 2, 1981 Project HBP-109A

City of Pleasanton P.O. Box 520 200 Bernal Avenue Pleasanton, California

Attention:

Subject:

Gentlemen:

Mr. Robert Warnick Director of Public Works and Utilities

Geologic and Fault Investigation Report SPRR Property, Hacienda Business Park Pleasanton, California

John J. Heneghan t<ennell1 v. Rodda

Eme$t Solomoo Antonio S. at.iangan

We are transmitting 4 copies of our report on a recently completed study on the Pleasanton Fault. This study was directed in evaluating an inferred trace of the Pleasanton Fault extending about 2,000 feet south of Inter­state 580 and into the project study area. This inferred fault trace is shown on the California Special Studies Zones Preliminary Review Map (PRM) of the Dublin Quadrangle issued on July 1, 1981. We have excavated a 500-foot long trench across thi.s inferred trace and found no evidence of faulting in at least the last 9,000 years (based on radiocarbon dating).

We have expedited this study to meet the deadline on the scheduled review of the PRM being currently undertaken by the affected cities, counties and state agencies before the official map is issued on January 1, 1982.

We would therefore appreciate it very much, if you could expedite the review of our report by your consulting geologist, so that the information contained in this report would be incorporated in the review process and submitted to the California Division of Mines and Geology and the State Mining and Geology Board for timely consideration.

JJH:ASB:lr

cc: Mr. Joseph J. Callahan, Jr. Mr. David D. Wright

Very truly yours,

~hn J. Heneghan Principal

1023 Corpora1ion Way. ~O. Box 10023, Palo Alto, California 94303. (415) 968-6250 • Telex Number: 348·427 Rocky Mountain Region: Lakewood, Colol'ado. Southwest Region: Newport Beach, California• And at major project sites wortdwide.

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GEOLOGIC AND FAULT INVESTIGATION

SPRR PROPERTY

HACIENDA BUSINESS PARK

Pleasanton, California

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PRUDENTIAL INSURANCE/CALLAHAN PENTZ PROPERTIES, PLEASANTON

August 1981

WAHLER ASSOCIATES

Geotechnical Engineers

Project HBP-109A

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Geotechnical Engineering

August 31, 1981 Project HBP-109A

Prudential Insurance/Callahan Pentz Properties, Pleasanton 155 Moffett Park Drive Suite 101, Building A Sunnyvale, CA 94086

Attention:

Subject:

Gentlemen:

Mr. David D. Wright

Geologic and Fault Investigation SPRR Property, Hacienda Business Park Pleasanton, California

George B. Fink Jack G. Wulff

Charles W. Perry John L. Laskey

Joseph L. Ma(zaK Jo:sepn J, Kulikowski

Forrest W. Gifford Jahn J. Heneghan

Kenneth V, Rodda Ernest Solomon

Antonio S. Buangan

This report presents the results of our investigation directed to evaluating the existence and activity of the Pleasanton Fault in the project area. We had previously conducted a detailed and extensive study of the Pleasanton Fault in your Willow West property, south of and adjoining the subject project site. Huch of the data generated during the previous fault investi­gation, including extensive literature search and review, airphoto interpre­tation, field reconnaissance mapping and trenching exploration, is per­tinent to the present study and is, therefore, updated and incorporated in this report. Our primary conclusion, based on the above, and an extensive trenching exploration program, is that there is no evidence of active faults in the project area that would preclude development of the site .

We appreciate this opportunity to provide our services on this interesting and challenging project. If you have any questions, please do not hesitate to call us.

ASB/JJH/lln

Very truly yours,

WAHLER ASSOCIATES

ohn J. Heneghan Principal RCE-17101, California

1023 Corporation Way, P.O. Box 10023, Palo Alto. California 94303, (415) 968-6250 •Telex Number, 348·427 Rocky Mountain Region; Lakewood, Colorado • Southwest Region: Newport Beach, Califo~nia • And at major project sites worldwioo.

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TABLE OF CONTENTS

EXECUTIVE SUMMARY

Chapter

I INTRODUCTION

A. Project Location B. Purpose of Investigation C. Scope of Investigation D. Site Description and Conditions

II GEOLOGIC SETTING AND SEISMICITY

A. Geologic Setting and History B. Seismicity

III METHODS OF INVESTIGATION

A. General B. Literature Review C. Airphoto Interpreta.tion D. Surf ace Observation E. Subsurface Investigation F. Radiocarbon Dating

IV FINDINGS AND CONCLUSIONS

REFERENCES

Number

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III-1

III-2

III-3

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FIGURES

Location Map

Sp.,cial Studies Zones, 1981 Dublin Preliminary Review Map

Site Map

Well Location Map

Generalized Geologic Map, San Francisco Bay Region

Seismicity Map, San Francisco Bay Region

Earthquake Epicenters, Pleasanton Arca 1969-1974

1951 Geologic Map, Pleasanton Area

Pleasanton Fault Compilation Map

1964-1969 U.S. Coast and Geodetic Survey Vector Diagram

Camp Parks Reconnaissance Map

Project HBP-109A

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II-1 II-2

III-1 IlI-1 III-12 III-14 III-16 III-21

Following Page

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III-21

in pocket

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Appendix

A

B

TABLE OF CONTENTS (Continued)

APPENDICES

Trench Logs - Figures A-1 to A-2

Test Pit Logs - Sheets 1 to 4

Borehole Logs DH-36 through DH-43

Site Map and Trench Logs, Previous Willow West Property Study

C Radiocarbon Age Determination

D Historical Earthquakes

Wohler Associates Project HBP-109A ii

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EXECUTIVE SUMMARY

The 280-acre Southern Pacific Railroad (SPRR) property of the proposed

Hacienda Business Park is located on the alluvial flats on the west side of

Livermore Valley. A portion of the project site is within an Alquist­

Priolo Special Studies Zone as shown on the California Division of Mines

and Geology Special Studies Zones Preliminary Review tlap of the Dublin

Quadrangle issued on July 1, 1981. The Special Studies Zone is a o;one of

potential damage due to faulting as delineated by the California State

Geologist in compliance with the Alquist-Pdolo Special Studies Zones Act

(codified as Chapter 7 .s, Division 2, of the California Public Resources

Gode). The present study was conducted in compliance with the Act, which

requires local governments to "withold development permits for sites within

the zones until geologic investigation demohst:ra.te.s that the site is not

threatened by surface displacement from future faulting." Thfa investi­

gation was directed to evaluating the existence and activity of the Pleasan­

ton Fault within the project area.

This investigation included excavation and detailed logging of a 500-foot

exploratory trench and an updated review of the geologic and seismicity

informat:.ion, as well as airphoto interpretation. Wahler Associates had

previously conducted a special studies o;one investigation on an adjoining

property to the south of the SPRR property known as the Willow West prop­

erty. Much of the data previously generate9- is relatively current and

pertinent to this present study and fa therefore updated and incorporated

in this report. Though faulting in the Pleasanton area is first noted on a

1951 geologic map of the San Francisco Bay region, the first evidence for

its existence was presented by the California Deparlment of Watar Resources

in its 1963 study of ground water resources in the Livermore Valley. This

evidence consisted of lineations in 1940 aerial photos, alignment of geomor­

phic features such as linear drainages and 11 sag ponds 0 ~ and diffe:rcnces ln

ground water levels. Other workers have reported right-late•al slip move­

ments on the order of several millimeters based on geodetic measurements;

Project llBP-109A ES-1

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these phenomena were attributed to fault creep. Most of the evidence cited

pertains to mapped traces of the Pleasanton Fault in the Camp Parks area

about 1/2 mile north of the project site, and where no investigative ti:ench­

ing is known to have been performed.

South of the project site, several detailed studies, employing investi­

gative techniques including trenching .• have bean previously performed. All

the studias reviewed found no direct evidence to substantiate the existence

and/or activity of the Pleasanton Fault .

North of the project site in the Camp Parks area, airphoto interpretations

of 1940 aerial photographs indicate three, well-defined, strong tonal

lineaments in the alluvium. These tonal features become abruptly faint or

discontinuous to the south and north. The eastei:nmost lineament could be

traced vaguely about 2,000 feet south of Interstate 580 and onto the SPRR

property. A field reconnaissance was performed in areas traversed by the

mapped traces of the Pleasanton Fault, particularly in the Camp Parks area

and othar areas whei:e most of the previously cited surficial evidence has

been reported; however, no features indicative of and consistent with

faulting were found. However, because these airphoto tonal lineaments

occur in the Holocene alluvium, supporting subsurface information would be

required to provide direct evidence of faulting in the pi:-oject ai:ea .

Consequently, it was reasoned that trenching would disclose evide.nce of

faulting in the exposed subsurface materials. Therefore, a 500-foot-long

trench was excavated in the alluvium across the inferred trace of the

Pleasanton Fault which passes through the project area, as indicated by the

easternmost tonal lineament on the 1940 airphotos, and by the 1981 Spacial

Studies Zones Preliminary Review Hap .

The backhoe exploration trench was excavated to an average depth of 15 feet

and up to a maximum of 16 feet. The trenches were logged continuously and

in detail by our ongineering geologists at a field scale of 1-inch equals S

feet. The materials exposed in the trenches consist of identifiable,

Project HBP-109A ES-2

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horizontal to nearly horizontal and interfingering layers of clays, silty

clays and sandy clays, usually interbedded gradationally. The individual

layers could be traced laterally for several feet, where they ei.ther pinch­

ed out or graded to another layer. Detailed logging of the alluvial ma­

terials in the trenches failed to show any offsets, ruptures, distortions

or warping, presence of fault gouge materials, ground water barriers or any

other feature that is indicative of faulting.

Charcoal and shell fragments were collected at depths of 11.2 and 9.5 feet

respectively and sent out for radiocarbon dating. The results indicate C14

ages ranging from 7,320 ± 610 years B.P. (Before Present) to 9,770 ± 400

B.P.

Therefore, based on our detailed investigation using currently available

geological techniques, it is our conclusion that no active faulting has

occurred at the project site in _at least the last 9 ,000 years, and that

evidence to date for the existence of the Pleasanton Fault at the project

site is indirect, inconclusive and unsubstantiated by the information

currently available .

Project HBP-l09A ES-3 Wahler Associates

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IiiTRODUCTION

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CHAPTER I

U\TRODUCTION

The project site comprises the Southern Pacific Railroad (SPRR) property

and is a portion of the proposed Hacienda Business Park in Pleasanton, Cal­

ifornia. Hereinafter, the project site will be referred to as the SPRR

property. The SPRR property is located on the west side of the Livermore

Valley, south of Interstate 580 and between Hopyard and Old Santa Rita

roads (Figure I-1). It encompasses an area of approximately 280 aci:-es,

straddling the Southern Pacific Railroad tracks. Although specific site

development plans are not presently available, it is our understanding that

the proposed development will consist of a number of buildings to be used

for light industrial and commercial purposes .

B. PURPOSE OF INVESTIGATION

The California Division of Mines and Geology (CDMG) has just recently

fasucd a Preliminary Review Map (PRM) of the Alquist-Priolo Special Studies

Zones (SSZ) for the 7-! min. Dublin Quadrangle dated July 1, 1981. A por­

tion of this PRM pertinent to this project study is shown on Figure I-2.

This PRM is a proposed revision of the official SSZ map originally issued

on July 1, 1974. Th~ PRM was submitted to the affected cities, counties

and state agencies for their review and comment. Following the appropriate

reviews, the State Geologist must provide an official map to the affected

cities, counties and state agencies. In the case of the Dublin Quadrangle,

in which the Pleasanton Fault is located, this official map will be issued

on January 1, 1982.

Relative to the subject propei:ty, this Dublin Preliminary Review Map shows

revisions on the traces of the Pleasanton Fault as a result of abundant and

Project HBP-109A I-1

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recent geologic information, including the extensive fault investigation

Wahler Associates' (1980a) performed on the Willow WQst property of tho

proposed Pleasanton Business Pa:rk, hereinafter referred to as the Willow

West property, south of, and adjoining the SPRR property. However, the PRH

shows an inferred trace of the Pleasanton Fault extending for about 2,000

feet south of Interstate 580 and passing through the SPRR property (Figure

I-2). This inferred trace is based on an airphoto lineament that is more

pronounced in the Camp Parks area north of Interstate 580 (Hart, 1981).

Because no direct geologic evid.,nce is available as to the presence or

absence of faulting interpreted from this airphoto lineament, a geologic

study with supporting subsurface exploration program would be required to

investigate faulting in the SPRR property.

A portion of the project site as shown on the PRH, therefore lies within

tho Alquist-Priolo Special Studies Zone, a zone of potential damage due to

faulting as delineated by the California State Geologist in fulfillment of

the Alquist-Priolo Special Studies Zones Act of 1972. The Alquist-Priolo

Special Studies Zones Act r"quires local governments to "withhold develop­

ment permits for sites within the zones until geologic investigation demon­

strates that the sites are not threA.tencd by surface displacement from

future faulting'' (Hart, 1980). It is, therefore, the purpose of this study

to assess and evaluate the presence and activity of faulting at the SPRR

property.

C. SCOPE OF INVESTIGATION

As discussed above, Wahler Associates has previously and recently conducted

an extensive study on the Pleasanton Fault on the adjoining Willow West

property to the south of the SPRR property. This previous study included:

• an extensive literature review on the geology and seismicity of the

project area, and review and analysis of studies previously performed

by various other investigators of the Pleasanton fault;

Project HBP-109A I-2

Wohler Associates

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• field reconnaissance, specifically directed to identifying surficial

evidence of active faulting;

• excavation and detailed logging of a 2,000-foot-long trench and a

short trench which straddled mapped tracos of the Pleasanton Fault;

• radiocarbon dating of samples for age determination;

• office geologic analyses .

The results of this previous study were presented in a comprehensive report

entitled, "Geologic and Fault Investigation, Pleasanton Business Park" for

CPS & Associates and dated, February 1980. Because the data generated from

this previous study is relatively current and pertinent to this present

investigation, much of .it is incorporated in this report.

Specifically, the scope of work for the present study includes:

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an updated review and analysis of literature concerning the geology

and seismicity of the project area;

excavation and detailed logging of a 500-foot-long trench at an aver­

age depth of 15 feet across the inferred trace of the Pleasanton Fault

in the project area;

• radioca~bon dating of samples for age d~termination;

• off.ice geologic analyses;

• preparation of this report .

Project HBP-109A l-3

Wohler Associates

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D. SITE DESCRIPTION AND CONDITIONS

The project site consist• of one large parcel of land divided by the South­

ern Pacific Railroad right-of-way. It is borde.red on the north by Inter­

state 580, on the east by Tassajara Creek, on the west by Chabot Canal, and

on the south by the Willow West property that was the subject of our pre­

vious fault study (Figure I-3).

The site is essentially flat with a maximum topographic relief of 22 feet

across its 1.3-mile east-west width. At the time of this investigation, it

wao used as a grazing ground for cattle.

Several old exploratory borings and wells apparently exist on the SPRR

property, as shown on the well location map provided to us by the Alameda

County Flood Control and Water Conservation District, Zone 7 in Livermore

(Figure I-4). The exploratory borings and some wells were reportedly

filled in or destroyed; except for 5M-l, 6J-l and 6Q-2 which still have

casing in the ground (Figure I-3). During our si.te investigation we found

the location of Well No. SM-1, where we measured the water level at a depth

of 15. 3 feet below ground surface. Well No. SM-1 is presently monitored by

Zone 7 as a part of a ground water monitoring network (Personal Communi­

cation, Mr. F. Moss, August 26, 1981). Other features present at the site

include a buried Pacific Telephone trunkline which crosses the eastern

pox·tion of the site in a roughly east-west direction (Figure I-3) .

Project HBP-109A I-4

Wahler Associates

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REFERENCE

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THESE ARE DHINEATU AS STRA l&NT-LINE 1ElfiNTS THAT CDllNECT EHlllCLEI

1 UIH I Ml Pl ltlTS U U· TO OEF l NE SPEC !Al STUD IU lUE If lllENn .

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SPRR PUPERTY

WlllOI WEST PROPERTY

EXPLDRATIRT tREftC~

!ODO FEET

USE FRH PHT IOM OF CAUHRN!A. SPEC-lAl STU1l 1£S HNES, PUl 111 I NAU UYI l'"I II.IP Gf !Dl)r 1 , 1 lft .

D Uil IM QUAHAll 8LE

W mR PR9PERIY , . A Wohler MAC IEllDA BUS 1 llESS PAR~ Assoclales°'":':":"":~:":'!~~::o::~~~~":"""::-:~=-1~-'~'~'~'~''~'=-'-"-· --1~--::=='~'~'~'':':l:~-+-~'-'-'~'~''~'-'-·~~

il'ILO .... TO- • Nfl,.llT ll•C-11 • If I IBM_IM .ll

OVERSIZED -~·

DOCUMENT HAS BEEN PULLED AND SCANNED, WITH THE MAP.

FILE.

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BM 325 '" '-.. l, PROJECT SITE

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SCALE: 1":2000'

A. WELL LOCATION MAP -GEOLOGIC LOGS

WELL NUMBER,

R2 • DEPTH 75 OF WELL/

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SOLID CIRCLE WHERE GEOLOQ IC LOG AVAILABLE.

OPEN CIRCLE WHERE NO LOOS AVAILABLE.

HORIZONTAL LINE, WATER LEVEL MEASUREMENT AVAILABLE, VERTICAL LINE WATER QUALITY DATA AVAILABLE.

~ DESTROYED WELL

B. WELL LOCATION MAP -HYDROLOGIC DATA

SOURCE: A. FROM ALAMEDA COUNTY FLOOO CONTROL ANO WATER CONSERVATION DISTRICT'S ZONE 7 WELL LOCATION MAP • QEoLOOIC LOGS. SHEET 1 OF a: LAST UPDATE: MARCH, 1 DBO; B. FROM WELL LOCATION MAP HYOROLOGIC DATA, SHEET 1 OF 3; LAST UPDATE: MARCH, 1980.

"l Wahler s PR R PR 0 PER TY

Assocl'at·"'s '-:~"'.'H".""AC-:-l-EN_DA"'.".'."."BU~S-IN_E_ss_P_A_RK __ +~:.!'.'..!!.::.!.~-11--!.!l.~-+-_!.!..!.!!.!L!!!C;__.J WELL LOCATION MAP

"' - Pi:ia,ECT Na. OATE FIGURE 110.

PALO ALTO• N!"WPOllT 9EAC!t • DEH'IER HBP-109A AUGUST 1981 1-4

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• GEOLOGIC SETTING AND SEISMICITY

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CHAPTER II

GEOLOGIC SETTING AND .~EISMTCTTY

A. GEOLOGIC SETTING AND HISTORY

The SPRR property is located in the western portion of the Livermore Valley,

an area more specifically referred to as the Amador Valley. The Livermore

Valley is the most prominent valley within the Hamilton~Mt. Diablo Mountain

Range of Central California and is bounded on the west by the Pleasanton

Ridge and on the east by the Altamont Hills. The general geology of the

area is shown on Figure II-1. The Pleasanton Ridge and Altamont Hills

consist of Jurassic to Cretaceous sediment;ary rocks known as the Great

Valley Sequence and are flanked on the foothills by Tertiary sedimentary

rocks. To the north of Livermore Valley are the Black Hills, which are

underlain by Eocene to Pliocene sedimentary rocks, forming a belt extending

to Suisun Bay. The highlands to the south of the valley contain rocks of

the Jurassic to Cret;aceous Franciscan Formation, which represent the oldest

rock units adjoining the project area.

The Livermore Valley is a structural basin underlain by a downwarped and

faulted sequence of Miocene-Pliocena sandstones and conglomerates. The

trend of the syncline defining this basin is roughly cast-west which is

somewhat of a departure from the northwest-trending regional physiography.

The basal units in the Livermore Valloy were deposited in shallow water and

nearshore marine environments thronghout the Miocene and into the middle

Pliocene epochs. These units have been identified as the Briones, Cierbo

and Orinda formations and are part of the Tertiary sedimentary rocks shown

on Figure II-1. During late middle Pliocene time, a great crustal disturb­

ance caused uplift of the entire Coast Ranges with associated folding and

faulting. Toward the end of this period of st;ructural disturbance, the

Livermore depression gradually developed as a downwarp between two zones of

weakness; the Calaveras Fault to the west and the Greenville Fault to the

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east. Erosion of the Cretaceous and Jurassic highlands continued with

accompanying deposition of the Livermore sediments in outwash plains and

lakes within the Livermore depression, and lasted into late Pleistocene

time. During the middle Pleistocene, the region was subjected to renewed

faulting and folding and the Livermore Formation developed a synclinal

structure. A period of quiescence followed until uplift of th" region was

renewed in the upper Pleistocene with the formation of the ancient Liver­

more Valley. At that time, the drainage was probably northward ouL into

what is now Suisun Bay. Sediment deposition continued and, at one point

during this depositional episode, the drainage assumed its present course

towards Alameda Creek through the Sunol Cap.

The region defined by the Livermore Valley has been subjected to two periods

of faulting and folding since the middle Tertairy. The Calaveras Fault,

running along the base of the Pleasanton Ridge immediately west of the

project site, is tho most immediate expression of that deformation and

serves to abruptly terminate the Livermore Valley syncline to the west .

B. SEISMICITY

The project area is located in a seismically active region which was sub­

jected to several strong earthquakes within the last two centuries.

Earthquakes have occurred throughout the entire San Francisco Bay region,

but most of them have been concnntrated along the active San Andreas,

Hayward, and Calaveras fault zones. Most epicenter locations are within a

mile or so of known fault traces. Recent small earthquakes also have the

same spatial distribution, as evidenced on a map (Brown and Lee, 1971) that

shows the location of active faults and the epicenter of earthquakes greater

than 0.5 Richter magnitude for the period from January 1, 1969 to December

31, 1970.

The most important active faults, their distances to the project site and

maximum credible earthquakes (Greensfelder, 1974) are listed below:

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Fault

San Andreas Hayward Calaveras

Distance (miles) and Direction

33.5 West 11.5 West 2.5 West

Maximum Credible Earthquake (Richter Magnitude)

Another significant fault includes the Greenville Fault, located about 8

miles east of the project site. This fault had been previously mapped but

considered inactive and was the cause of magnitudes 5.5 and 5.2 earthquakes

in January, 1980. Several other faults, such as the Pleasanton and Parks

Fault, have been postulated to exist within the confines of the valley but

their presence and activity continues to be the subject of much debate.

The inferred Parks Fault crosses the southeastern corner of the project

site in an east-west direction. It was postulated on the basis of analyses

of well log and water level data by the California Department of Water

Resources (CDWR), (1963). No surface expression of this inferred fault

exists, neither does it appear on aerial photos. Burkland and Associates

(1975) trenched across the inferred mapped trace of this fault (as shown on

the 1974 CDWR map); however no evidence of foul ting was found.

The history of earthquakes in and around the San Francisco Bay Region that

probably affected the proposed SPRR property goes back to the early lSOO's .

Large earthquakes that affected this region are listed in the "Descriptive

Catalogue of Earthquakes of the United States" (Townley and Allen, 1939),

which includes seismic events prior to 1927. The U.S. Coast and Geodetic

Survey has published non instrument reports for later years, as well as

instrument-located epicenters of earthquakes that have occurred since 1928.

Appendix D presents a listing of major earthquakes, occurring between 1800

and January 1980 in the San Francisco Bay Region, that caused damage, had

severe shaking cl1aracteristics or showed evidence of surface "t"Upture •

As shown on the seismicity map (Figur<> II-2), during the period from 1900

to ~arch, 1979, 11 earthquakes of Richter magnitude 4.0 and greater occur­

red within a JO•mile radius of the project site. Recently, two sizable

earthquakes occurred in the Livermore Valley area; the magnitudes 5.5 and

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5. 2 (as measured by the U.S. Geological Survey) seismic events of January

24 and 27, 1980, respectively, with epicenters located about 10 miles

northeast of the project site. These recent earthquake events are also

plotted on Figure II-2. Another magnitude 5.5 earthquake occurred on June

11, 1903 about 8 miles to the southeast as shown on the Earthquake Epi­

center Map of California (Real and others, 1978). As shown on Figure II-2,

no earthquakos of magnitude 4. 0 and greater, have occurred within 5 miles

of the projoct during the period 1969 to 1974, two small earthquakes of

magnitudes 0.5 to 1.5 occurred immediately west of the project site (Figure

II-3). During the time interval 1900 to March, 1979, several tens of

earthquakes of magnitude 4.0 and greater occurred within a 40-mile radius.

Two of the earthquakes had magnitudes greater than 6. 0. One was a magni­

tude 6.6 earthquake on June 1, 1911 located about 30 miles south of the

project site and apparently originating on the Calaveras Fault Zone. The

other was the great 1906 San Francisco earthquake with an estimated magni­

tude of 8.3 with an epicenter location located about 37 miles west of the

project site .

The largest and closest earthquake to the site was the July 3, 1861 event

that was probably caused by movement along the Calaveras Fault west of the

site. The earthquake had a probable maximum Modified Hercalli (MH) inten­

sity of IX and was associated with ground ruptures in San Ramon and Amador

Valleys (Radbruch, 1968).

In May-July, 1970, several thousand small earthquakes ranging up to magni­

tude 4 occurred near Danville, California about 6 miles northwest of the

project site. This is shown as the roughly circular cluster of epicenters

in Figure II-3. The Danville earthquake swarm was studied in detail by Lee

and others (1971). Fault-plane solutions indicated that a north-west

trending, righ-lateral, strike-slip sense of fault movement was associated

with the earthquakes. Although the earthquakes could not be related to any

known geological structure or fault, the epicentral area lies in the north­

west projection of the mapped Pleasanton Fault. However, a 3 km (1.9 mile)

gap in the seismic activity occurs between the epicentral area and the

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mapped traces of the Pleasanton Fault. Because of the roughly circular

pattern of the earthquake foci, Lee and others (1971) suggested that the

earthquake activity could be related to some type of pierccment structure.

According to Ellsworth and Ma:rks (1980), through the use of focal mechanism

solutions and other seismological evidence, the Pleasanton Fault is "prob­

ably seismically active". They note that "the distribution of earthquake

hypocenters and orientation of their focal mechanism to the north (of the

Camp Parks area) strongly suggest that this fault continues to the north

along the east side of San Ramon Valley". Th<iy state that few epicenters

are actually located near the inferred traces of the Pleasanton Fault and

that "their association with the fault cannot be nnambiguously demon­

strated". South of the Camp Parks ai;ea in which the project site is lo­

cated, no evidence ·of histodc scismicity is associated with the Pleasanton

Fault .

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I ' OVERSIZED · DOCUMENT HAS

BEEN PULLED AND SCANNED WITH THE MAP.

FILE.

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EARTHOUAKE EPICENTERS 1900 THROUGH MARCH 1979*

MAGNITUDE

4.0 TO 4.9

5.0T05.9

6.0 TO 6.9

7.0 TO 7.9

a.a OR GREATER

INTEGER .... MAXIMUM REPORTED INTENSITY , ·.,.->I!).·. (Only for 11rthquako1 ot UNKNOWN maw;nltude), ,

*INCLUDES COYOTE LAKE EARTHQUAKE OF AUG 8. 1979 AND MT. DIADLO EARTHQUAKES OF JAN 24 AND 27, 1980·,

FROM EARTHQUUE EPICENTER MAP fT'I OF CALIFORNIA, 1901)...1974; REAL"-..:..) AND OTHERS, (1978), ANO TOPPDZAOA AND OTHERS, (1979).

SCALE

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I.· I / .·· ·' I \. I '· ·• I ·"· . i /- _,,_ .. ·"}' ·, ··-_

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SEISMICITY MAP

,P..: I -··.J ,.-~. :!-'--

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·· -37'0 001

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HACIENDA BUSINESS PARK Associates""::':":"'.:-:~:-:~~~~~~~~~....i1--...:.;''~'~'~';•~·;·~·~·~1--...,,,.,.;•~·~·~·,..,.,.,...-1-....::..:.:.:;.;.!,,.:"~'~---.1

fl'AlO ALTll • MEWPOA'f BEAcM· • DEflYElt H8P-108A AUlllUIT !911

SAN FRANCISCO BAY REGION

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2 0 2 Ml LES x x • MOOIFIEO FROM.HANNA

AND BRABB, 1979. +

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Associates

• PALO ALTO • MEllPgAT l!IEACH • 0£N't'ER

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MAGNITUDE 3.5 TO 4.5 + MAONITUDE 0.5 TD 1.5 MAGNITUDE 2. 5 TO 3.5 • i!AGN I TUOE LESS THAN Q. 5

MAONITUOE 1.5 TO 2.5

EARTHQUAKE EPICENTERS PLEASANTON AREA 1969-1974

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• METHODS OF INVESTIGATIOM

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A • GENERAL

CHAPT£R III

METHODS OF INVESTIGATIOt>!

As discussed previously, the previous fault study on the Willow West prop­

erty immediately south of the project site included an exte11sive literature

seai::ch on the Pleasanton Fault, field reconnaissance mapping, airphoto

interpretation and subsui;face (trenching) exploration work. Huch of the

information generated dudng the previous fault study is applicable and

pertinent to the present study and is, thiorafore, updated and incorporated

in this report .

B. LITERATURE REVIEW

A significant part of the previous fault investigation of the Willow West

property, consisted of an extensive and in-depth literature review on the

Pleasanton Fault, including several detailed studies directed at evaluating

mapped traces of the Pleasanton Fault as shown on the 1974 Special Studies

Zones Map of the Dublin Qu.~drangle. Sources of this information included

the California Division of Mines and Geology Special Studies Zone file in

San Francisco, tha Alameda County Geologist's files in Hayward, U.S. Geo­

logical Survey in Menlo Park, Abmeda County Flood Control and Wate.r Con­

servation District, Zone 7, ir1 Livermore, and personal communications with

various government and private consultants.

1. [~story of the Pleasanton Fault

The earliest known mapping of faults in the Pleasanton area is on a geology

map of the San Francisco Bay Region by Bowen and Crippen (1951). This map,

at a scale of 1-inch equals approximately 6.8 miles, was reportedly com­

piled from various sources which are not referred to in the text accompany­

ing the map. The northwest-trionding fault is shown passing through the

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City of Pleasanton (Fi.gure Ill-1). The 1918 Geologic Map of California

(Jenkins, 1938) does not show the Pleasanton Fault; neithar is the fault

shown on a relatively more detailed geologic map of the 15-minute Pleasan­

ton quadrangle by Hall (1958). A review of other publications (ll,anner,

1912.; Lawson, 1912.; and Funkhouser, 1948) did not disclose any reforences

to faulting in the Pleasanton area .

The Geological Society of Sacramento (1959) first named the fault and shows

it in a small scale map as two separate fault traces similar to the traces

contained in California Department of Water Resources (GDWR) Bulletin No .

13 (1963) in their study of the ground water geology of the Alameda County

area. The Society describes the Pleasanton Fault as having expression on

1939 aerial photographs as far south as one-half mile south of Interstate

580. The existence of the Pl.easanton Fault as mapped by the GDllR, was

based on interpretation of 1940 aerial photographs and diff<>rcnces in

ground water level. The Pleasanton Fault is described as consisting of two

separate, nearly parallel fault traces trClnding about N2.5"W. Subsequent

publications of the CDWR (1964 and 1966) show the same location of the

Pleasanton Fault. Radbruch (1968), in her investigation of historic fault

activity, also cites the 1963 CDWR map. Gibson and Wollenberg (1968), in

their evaluation of geologic and geodetic studies in the Camp Parks area,

also used the 1963 CDWR Pleasanton Fault location. In 1974, the California

Department of Water Resources published an Addendum to the Geology Appendix

of the 1966 CDWR Bulletin No. 118-2, based on acquisition of additional

geologic and ground water data. In the 1974 g<>ologic map, the location of

the Pleasanton Fault was modified to include as many as four coalescing

fault traces in the Camp Parks area with the two parallel traces from the

1963 CDWR map shifted up to 400 feet to the west.

The California Division of 'lines and Geology (CDHG) Special Studies Zone

map of the Dublin Quadrangle issued on July 1, 1974, retains the 1974 CDWR

Pleasanton Fault location north of Interestate 580. South of Interstate

580, the Special Studies Zones map shows the western trace coincident with

the western trace shown on the 1974 CDWR map. However .• the eastern traces

and the eastern branch of the western trace are shifted as much as 900 feet

to the west of the 1963 CDWR fault location.

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Herd (1978) indicates three fault traces in the Camp Parks area, based upon

his interpretation of the 1940 ae.ria.l photos, with the location of these

traces generally similar to those on the 1963 CD\IR map. He.rd does not show

the three traces extending into the project area. Dibblee (1980) in his

prelimit>ary geologic map of the Dublin Quadrangle, shows two short, infer­

red traces of the Pleasanton Fault near Interstate 580, both of which

extend into the project area. His traces do not correspond with those by

other workers and are indicated on the geologic map as inferred traces of

doubtful existence in the area .

The location of these interpretations of Pl"asanton Fault traces discussed

above, is compiled on Figure III-2. The California Division of Hines tlnd

Geology essentially adopted the 1974 CDWR Pleasanton Fault location north

of Interstate 580 with some modification to the south for their Special

Studies Zones tlap of the Dublin Quadrangle issued on July 1, 1974.

2. Prelimi.narv Review Hap, Dublin Quadrangle July 1, 1951

On July 1, 1981, the California Division of Hines and G<>.ology issued a

Preliminary Review Hap (PRH) of the Dublin Quadrangle showing revisions of

the Special Studies Zones (SSZ) for the Pk,>santon Fault. The proposed new

and revised Special Studies Zones Hap was issued for review purposes pur­

suant to the Alquist-Priolo Special Studies Zones AcL The PRM will be

superseded by an official map on January l, 1982 at which time the zoning

becomes effective.

The basis for revising the Special Studies Zones for the Pl~asanton rault

is discussed in detail by Hart (19Sl) and cit.es numerous investigati.ons re­

lated to the Pleasanton Fault. Basied upon mor<> recent and direct evidence,

including Wahl<>.r A5sociates' (1980a) previous fault. study on the Willow

West. property, this PRH has eliminated a number of the more doubtful tnices

of the Pleasanton Fault from the 1974 SSZ map. The more pertinent conclu­

sions of Hr. Hart (1981) relative to the project site are quoted below:

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11 1. Camp Park~-~~· Three well-defined t.onal lineaments axe re­vealed by 1940 aerial photos of the U.S.D.A. (Figure 4). Although the features may be artificially create.ct, they occur in Holocene 1'1luvium and may be caused by faulting. However, the reported creep of Rad­bruch (1968) could not be verifi.ed. Evidence for horizontal crustnl strain is small (maximum 1.8 cm right-lateral slip), confined to a short period of time (1964-1969). Such movement may be related to ~urvey errors c111d/or subsidence related to gr-ound v.·ater ch[1ngcs and expansive soi ls. ·rhe well-do.fined features cannot be tr~iccd more than 2, 000 feet south of Highway I-580. Only the middle trace can be inferred to extend northward through Camp Parks along a linear drain­agn (former channel of Aluino Creek) that m.ay o:r. may not be fault-con­trolled. That trace was not identified in terrnce deposits of Alamo Creek, either on aerial photos, in the creek bank, or in exploi-atory trenches. Th'° inferred fault traces mapped in this study largely coincide with the traces of Hansen (1966)."

"4. Hig_hway I-580 to P.l_e_asanton. Except for the vagno tonal line­ament extending 2000 feet south from Camp Parks, there is no evidence of faulting in the late Holocene depodts. The ground water barrier inferred to exist at deptl1 cannot be seen on ae.rial photos and no faults were reported in deep trenches or in the exposures of Arroyo Hocho and Arroyo Valle."

Based on these conclusions, Hart (1981) i-ccommended revision of the Special

Studies Zones for the Pleasanton Fault. In the Camp Parks area, he recom­

mended rezoning of the three well-defined features of Holocene Hge that may

be related to faulting. Between Interstate 580 to Pleasanton, Hart recom­

mended deletion of all traces except the easterly trace that extends 2,000

feet sonth of the highway. These revisions are shm<r1 on Figure I-3 .

3. Discussion of General References on the Pleasanton Fault

Most of the evidence for the existence and r~c.cnt activity of the Pleasan­

ton Fault is for the mapped fault tr,,ces north of Arroyo Mocha. Various

California Department .of Water Resources publJcations (1963, 1964, and

1966) on the ground water geology of the Livermore Volley area cite inter­

preta~ions of 1940 aerial photographs of the Commodity Stabilization Ser­

vice of the U.S. Department of Agriculture and diffoJ:-ences in ground water

levels as nvidence for the existence of the. PleJ:l.sa.nton Fault.. From these

studies, the Pleasanton Fault was interpre.t:ed as consisting of a ma.in ~·est

fault and a discontinuous east branch. In reference to the 1940 photos and

ground water level differences, we quote the following stateme.nt f:rom the

1963 CDWR report.

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"The expression of these faults can be clearly seen on aerial photo­graphs taken in 1940 (Aerial Photograph No. BUT 341-105). The area has since been leveled for construction purpooes, and snbsc•quent aerial photos do not show th~ fault traces. On the 1940 photos, the faults are strongly expressed by aligned gullies and saddles in the low alluvial terrace on the north side of the valley floor. A sag pond was observed in 1951 where the western-most fault crosses Dought­ery Road on this terrace. From the edge of this terrace southward to U.S. Highway 50, the 1940 photos show a marked change in shading at the faults due to differences in vegetation of soil or both. Surface evidences of the faults disappeai: about one-half mile south of U.S. Highway 50. Farther south there is no surficial evidence of the faulting, but a marked difference in ground water levels across this fault defines its positon to the southern edge of the valley. The ground water surface usually stands higher on the east s:lde of the fault. Evidence from well logs, and the pi;esence of wells of high yield very near the ground water break on both sides, indicate that the difference in water levels is not due> to a pinching out of the wator-bea•ing sands and gravels along the ground water break, but rather to a barrier effect at the fault itself, probably caused by offset of beds and/or the presence of gouge."

The 1966 CD\IR report refers to the 1940 aerial photos describing both fault

traces appearing "as dark lines against a slightly lighter-toned background

that p<n:haps results from a slight difference in the moisture content of

the. soil. 11 This aforementioned report also cites topographic evidence of

the main fault consisting of "small creek channels that parallel the trace

including a 1,200 foot stretch of Alamo Cre<>k .1nd aligned ravines·' par­

ticularly where the main fault crosses the Orinda Formation between South

San Ramon and Or ind a Crocks . 11

Several detailed gravity profiles were run in the Livermore Valley area,

including a profile across thn C1'mps Parks area (Griscom and others, 1979).

The Camp Parks profile traverses the three Pleasanton Fault traces mapped

by Herd (1978). Two small gravity highs were located close to the eastern­

most and westernmost fault t.races mapped by Herd. However, a fault further

to the east of these small gravity highs, on a steep gradient on the gra­

vity profi ln, was offCTrcd as an alternate ,interpretation. Because: of

uncertainties in interpretation, the authors suggested that 11more exter1sive

data arc needed to determine the most likely intcrpJ;"etatiaI1. tt Another

detailed gravity profile, known as the Randum gr1'vity profile, was several

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miles long and was conducted along the Southern Pacific Railroad right-of­

way through Pleasanton (Figure III-2). Several local gravity fe.atures are

pre.sent on the profile and as many alternate interpretations of possible

fault locations related to these gravity features were discussed (Griscom

and others, 1979). These i,nt"rp-cetations are apparently inconclusive; the

authors have noted significantly that:

"Because of ambiguity it is nearly impossible to prove that local gravity anomalies on detailed profilP.s across unconsolidated sediments are definitely :related to faulting. Several closely spaced profiles will be necessary. Even if the same local gravity features are pres­ent on each profile and even if the features are colinear and located along a proposed fault trace, then the relationship, though rather compelling, is still not proven. In general, detailed profiles are only one piece of cwidcnce which must be evaluated in conjunction with all other evidence when searching for proposed faults in unconsolidated sediments. 11

Studies relating aeromagne.tic anomalies to identify fault system~ in the

San Francisco Bay region have recently been published (Hanna and Brabb,

1979). No magnetic anomalies occur in the Pleasanton area, however, sev~

eral narrow, olongated northwest-trending positive anomalies occur north­

east of the project area. Most are less than 20 kms (12 miles) long. Most

of these anomalies are associated with serpnnt.i.nite or other magnetic

source rocks. One such li11ear anomaly, c..-111cd the Doolan feature, occurs

about; S miles northeast of the project area and appears to extend to pre­

viously mapped faults to the southeast, including the Carnegie and Tesla

Fault. It is interesting to note that tho 1970 Danville cluster of earth­

quake epicenters, which assumes a roughly circular distribution, occurred

at the northwest extremi.ty of the Doolan anomaly. Hanna and Brabb (1979)

suggest the possibility of serpentinite being emplaced diapirical1y in the

Danville area, which is in line with the piercem~nt structure postulated by

Lee and others (1971) .

A geodetic network was established by the U.S. Coast and Geodetic Survey in

the Camp Parks area in 1964, specifically to evalut<> movements along the

Pleasanton Fault, which was considered to be undergoing active tcctonism

(Gibson and Wollenberg .• 1968). The three small networks in the Camp Parks

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area consist of two simple quadrilaterals and two connected quadrilaterals

and were installed to span the main west and east trace of the Pleasanton

Fault (Figure III-2). The stations consist of 18 to 24-inch diameter piers

extending to depth of 40 frot (Parkins, 1965). The original triangulation

was done in April and May, 1964, and re-observation made one year later in

June, 1965. Detailed analyses of these measurements by Gibson and Wollen­

berg (1969) indicated consfatcnt clockwise horizontal movement across the

Pleasanton Fault, although the magnitudes of displacement were question­

able. A vertical difference on the order of 0.05 feet was attributed to

the develpment of a subsidence basin in the southern San Ramon Valley .

A second set of measurements was made by the U.S. Coast and Geodetic Survey

(Hiller, 1970) in November, 1969. Analyses based upon the 5-year interval,

1964 to 1969, suggests a right-lateral movement of about 18 mm at site PFS

(Figure III-2). No significant movements were measured 11t site PFE; how­

ever, at site PFW there is an indication of about 10 mm of relative move­

ment. The position vectors and 95 percent error ellipses at the survey

stations at the Camp Parks site are shown on Figure III-3. The California

Division of Hines and Geology (Bennett, 1979) measured the lines in the PFS

network using electronic di.stance measurements in October, 1974, and again

in May, 1979. This most recent survey (1974-1979) indicated the absence of

any lateral movement within thw PFS network which had earlier indicated 18

mm of right lateral movement during the Lime interval 1964 to 1969. Al­

though the U.S. Coast and Geodetic Survey data obtained by triangulation

and the CDMG data obtained by electronic distance measurement are not

strictly comparable, Bennett (1979) indicated good agreement in comparing

lin" lengths between the surveys and suggested that there was no continued

lateral movement of any sjgnificance during the 1969-1974 period. First

order releveling surveys conducted by CDMG from 1965 through 1975, indi­

cated that additional subsidence for that period was of the same order of

magnitude as that determined for the 14-month period in 1964-1965 by the

U.S. Coast and Geodetic Survey.

The results of these surveys are inconsistent in the three networks during

the time period 1964 to 1979, although Bennett (1979) explains earlier

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offsets as a result of periodic creep. Although 18 mm of horizontal dis­

placement occurring in a 5-year period would appear to be significant,

su"t""face evidence and seismicity are lacking or inconclusi·ve.:1 B::ii discussed

previously and later in this chapter.

Hart (1981) in his analysis of the geodetic data, suggests that the concen­

tration of horizontal and vertical movements in the 1964-1965 period and

the reversals of moverr1ent at certain benchrr1arks in the Carr1p Parks area, rr1ay

be largely •elated to ground water withdrawal/recharge or expansive soil

conditions .

4. Previous Plea .. ~anton Fault_ Investigations

Since the original zoning of the Pleasanton Fault as part of the Special

Studies Zones in 1974, several detailed investigations have been conducted.

The locations of the rr1ore significant and pertinent investigation areas are

shown on Figure I II -2. As discussed previously, rr1ost of the evidence for

the existence and recent activity of the rr1apped traces of the Pleasanton

Fault cited by earlier workers, include aerial photo lineations and dif­

ferent ground water elevation in welts (CDWR, 1963., 1964, 1966 and 1974),

fence offsets (Radbruch, 1968), subtle rr1orphologic features (Herd, 1978),

and very small differences in geodetic rr1easurements (Gibson and Wollenberg,

1968; Parkins, 1965; and Hiller, 1970). Host of this indirect evidence is

located in the Camp Parks area and, to onr knowledge, the. existence of the

fault has not been confirmed by trenching. The following investigations by

Wahler Associates and other workers cite the more recent and direct evi­

dence whi.ch has been used to nwise the 1974 Special Studies Zones Map.

Only the studies north of Arroyo Mocho and de.err1ed pertinent to this fault

study are surr1marized .

a. Willow West Property (rlell.santon Business Park)

(1980a)

Wahler Associates

As mentioned earlier, a previous fll.ult investigation was per£orrr1ed by

Wahler Associates, on two pll.rccls of land irr1mediately south of the

present project site (Figure I-3). This .investigation included a

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d£!:tsiled fiold reconnaissance of inferred surface. features, extensive

trenching, and a review of the literat1ire concerning evidence for and

against the e>dstcnce of the Pleasanton fault and concerning the

geology and seismicity of the area.

The field reconnaissance was performed primari. ly in the Camp Parks

area, but included much of the area surrounding the Willow West prop­

erty. No <>vidence indicative of fault movement and activity was found.

Many structures along the inferred fault trace were found undisturbed,

and those that were could have been alte<nativcly explained by dif­

fere11tial soil expansion or imprecise construction.

A 2, 000-foot-long trench was excavated across a 11 known inferred

traces of the Pleasll.nton Fault (as shown on the 1974 SSZ map) within

the Willow West property. Another 200-foot-long trench was excavated

where it might intercept the projection across the railroad tracks of

the 1940 airphoto tonal lineament found within the SPRR property. The

location of these trenches is shown on Figure 1-3. Because of the

pertinence of the prBvious trenching work to this present study, the

trench logs and site map from the Willow Wnst property investigation

are included in Appendix B of this repoi:t. No evidence of faulting

was found in either trench. Radjocarbon dating allov:ed Wahler Associ­

ates to estimate the age of a layer found continuous throughout the

base of the long trench at about 5,600 years before present. Thus, the

evidence indicated that there had be<>n no faulting at the site for the

past 5, 600 years .

A detailed analysis of the available literature failed to reveal

direct, conclusive evide11ce supporti.ng the fault's existence. Based

upon the available information, Wahler Associates concluded that

evidence for the existence of the Pleasanton fault at the side was

indirect, inconclusive, and u11substantiated by the information current.­

ly avail ah la .

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b. Hopyard Road Site - Harding, Miller, Lawson & Associates (1972) .

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This ar<>a includes the western poi;tion of the SPRR property. The in­

vestigation consisted of an airphoto intcrpretatio11 and a series of

east-west trenches and seismic lines across tonal features :seen in the

aerial photos. The tonal features were thought to represent "newly

suspected faults". Three ti:enches were excavated, each about 600 feet

long and about 8 to 10 feet deep. Two east-west seismic lines, 800

and 1,200 feet long, were also performed. "l"he location of the trench­

es are shown on Figure III-2. The materials in the trenches are

described as stiff clays interlayered with thinner sand horizons. The

individual sand beds thin and pinch out or were replaced by another

lower or higher bed. Occasionally, they thicken downward to fill

buried channels eroded in the underlying clay. · A zone of caliche

nodules also persists in a regular zo11e ~'"it a uniform depth throughout

the trenches. Variations in the seismic velocity profiles were inter­

preted as local lenses of coarser grained material. No evidence of

faulting was found in the alluvium to the depths explored by trench­

ing.

VaU~y Memorial Hospit:_al Site - Burkland and Associates (1975).

This site is located southeast of the SPRR property and outside the

Special Studies Zones (CDHG, 1974); however, published information

(Ford, 1967 and ClJWR, 1974) showed traces of the Pleasanton Fault and

Parks Fault passing through the site. Three exploratory trenches wei:e

excavated in the hospital site area, with an aggregate length of l, 190

feet and depths of about 10 feet. Soil horizons in the trenches were

virtually hor.izontal and continuous for the entire trench length, and

no evidence. of faulting was found. Part of this investigation includ­

ed the logging of 8, 500 feet of the north bank of Arroyo Macho from

Hopyard Road east to beyond Santa Rita Road. The log of the 15 to

18-foot high bank shows nearly horizontal to low-dipping, continnous

to interfingered, alluvial units, which ~how no evidence of vertical

or lateral offset or shearing. This study also included a geologic

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reconnaissance, which consisted mainly of searching for evidence of

fault creep in the Cnmp P1trks area. Paveme11ts, concrete st rue.tu-res·'

curbs, and railroad tracks were reportedly closely examined, but no

evidence of fault creep was found. Numerous distortion features

observed in fences of all types could be attributed to highly expan­

sive soils and/or deterioration with age. According to this study,

the sag pond reported in a CDWR (1963) study across Dougherty Road was

apparently created whan the road alignment destroyed the natural

drainage to the north .

South of Arroyo Mocha, several other fault studies have been conducted and

included the Tract 3359 Creeks Bend Subdivision by Applied Soil Mechanics

(1977); Amador High School by Earth Sciences Associates (197.5a and 1975b);

Proposed Civic Center Additions by Judd Hull and Associates (1977); Pro­

posed East County Civic Government Center by Carpenter- (1975); and Sycamore

Road Site by Earth Sciences Associates (1979). All these studies failed to

uncover any direct evide11ce of Holocene faulting .

As discussed previously, north of Interstate 580 in the Camp Parks area, no

known subsurface exploration work was performed to confirm indirect evi­

dence of faulting. However, in the Komandoroki Village, west of Camp

Parks, Engeo, Inc., (1979) conducted subsurface exploration consi.sting of

geophysical and trenching work to evaluate the presence and activity of the

western trace of the Pleasanton Fault (Figure III-2). Five anomalies noted

in geophysical lines were investigated by ""cavating trenches 30 to 50 fe"t

long .1nd 12 feet deep. The trenching revealed that the anomal i.es wore not

fault-related, but were due to buried pipes, dipping gravel lenses, or

saturated concrete and metal debris fill. Napping conductCld along adjacent

Alamo Cre"k also indicated no evidence of faulting .

North of Camp Parks, in the Dougherty Hills area, there is no evidence of a

well-defined, through-going fault. Trenching along most likely fault

traces failed to reveal any evidence of faulting in the alluvium (Hart,

1981). In several places, mapped faults were shown by trenching to be

inactive or non-.,xistcnt with the exception of the Terrasearch (1979)

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fault. The northorn third of this fault reportedly affects topsoil in some

of the tre.nches and aligns with a ground water barrier and distressed

segment of Old Ranch Road. The southern part of this fault is somewhat

inferential and therefore questionable (Hart, 1981).

c. AIRPHOTO INTERPRET~TION

A thorough examination was made of several sets of vertical aerial photos

of the projflct site and vicinity listed below .

DATE TYPE AND S_CALE :E_HOTO NUMBERS

6/8/1940 Black and white BUT-341-104 through 106 l" = -1660'

3/12/1950 Black and white BUT-4G-54 through 56

11/ 22/ 1950 Black and white AV 49-01-03 and 04 AV 49-02-01 and 02

5/16/1957 Black and white AV 253-25-34 through 36 1: 12000 AV 253-25-42 and 43

5/15/1969 Black and whit" AV 903-03-19 and 20 AV 903-04-18 and 19

Lineaments were identified on several sets of aerial photos, but those seen

on the 1940 set were the strongest and most significant and were also

ob;erved by others (CDWR, 1963, 1964 and 1966; Herd, 1978; Han, 1981).

Photo Nos. BUT-341-104 through 106 (of the 1940 set) show three tonal

lineaments trending northwesterly through the area now occupied by Camp

Parks. These features occur in young alluvium and it is evident that they

formed in the last few t::housund years. These ton.al features could conceiv~

ably be artificial and may be attributed to farming or drainage lines

(Hart, 1981). The westernmost feature consists of a faint tonal lineotTient

restricted to within the immediate Camp Parks area. The central feature is

a sharp, tonal lineament which crosses Camp Parks and to the north becomes

coincident with several linear drainages~ a closed depression feature which

was probably noted as a "sag pond" by others (CDWR, 1963) and an aligne.d

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river gully. The third and easternmost fcatnre is a strong tonal lineament

seen on the Camp Parks site and extending as a weak lineament south of

Interstate 580 and through the project site, where it appears to terminate

at the Southern Paci fie Railroad ti:acks. It is this lineament fr,1ture that

was investigated by trenching within the project area during thi.s study.

The southerly projection of this easternmost lineament was also inves­

tigated by trenching during the previous Willow West property study.

These lineaments were found to closely coincide in the Camp Parks area with

soil lineations noted by Herd. (1978) and also referred to as the "visible"

northern portion of both the main fault; and the east branch of the Pleasan­

ton Fault in several California Depart:ment of Water Resoui;ces publications

(1963, 1964 and 1966). As discusse.d in these references, the tonal line­

ations are. restricted to an area north of Interstate 580 becoming '1weak to

indi.stinguishable" as they entered north of the Camp Parks area beyond

Dougherty Road and are no longer discernable a half-mile south of Inter­

state 580. Construction and grading activities subsequently obliterated

these lineaments which acco11nts for their abtience in the. more recent sets

of aerial photos (after 1940).

In summary, a single to11al lineament was found crossing the project site

between Camp Parks and the railroad tracks. It was this lineament which

was used as a guidelin~ for locating our trenchi11g exploration program in.

the pi:-oject area (Figures I-2 and T-3). Other lineaments observed within

the Camp Parks area, although field-checked in our previous research, have

not to our knowledge been investigated by trenching .

Tl1e accepted contention in aerial photo interpretation is that lineations

like those noted above, may be axpressions of surficial faulting, but that

they are not conclusive evidences of faulting and may represent other

natural procP.sscs such as buried stream channels 1 or they may be related to

man-made activities, such as farming or drainage lines .

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D. SURFACE O~SERVATIO~

1. Camp ~arks Area

The Camp Parks area was built as an Army installation just prior to World

War II and has been cited in several previously publish<>d papers and re­

ports (Radbruch, 1968; Gibson and Wollenberg, 1968; CDWR .• 1963, 1964, and

1966) on the axistence and/or activity of the Pleasanton Fault. Surface

observations were conducted during our previous study on the Willow West

property in 1980 and arc discussed herein. An initial field i;cconnaissance

was undertaken to identify any features which might be construed as bei.ng

associated with active faulting or creep activity, as well as to field

check features noted by other authors. The streets south of the parade

grounds from 6th Street to Railroad Drive were walked· with special atten­

tion directed towards identifying any disturbances to pavements, railroad

tracks or structures, particularly those positioned along the inferred

traces of the Pleasanton Fault. Figure III-4 is a compilation of 1) obser­

vations made in the Camp Parks area throughout the course of this investi­

gation, and 2) a plot of all the inferred traces of the Pleasanton Fault by

various investigators. It should be noted that Camp Parks exists in a

state of almost total abandonment and has apparently be.en so fer several

years .

The decayed state of pavements on the site made disti:-ess identification

somewhat dif f icl1 l t; however-, exposed concrete perimeter foundations, rail­

road tracks .and fence lir1es, provided excellent points. of observation .

Pavements located along the inferred traces showed no more additional signs

of distress or deformation than did adjacent pavenients. Disturbsnces to

railroad tracks were observed in two locations (Figure Illc4), but the

presence of 11ndisturbed structures and/or parallel sets of rai.lroad tracks

immediately adjacent to these features, suggests that these disturbances

were not fault-related. Buildings straddling the inferred traces e.xh.ibit

no higher degree of disturbance Lhan do adjacent structures .

Fences bordering Camp Parks to the northwest and the south, were noted to

have been offset on the order of several inches by Radbruch (1.968). During

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the surface reconnaissance~ evidence of distortion to the presumed ini­

tially straight alignment of these fences was observed randomly along these

and other areM not positioned along inferred traces .• and is probably

related to the effects of expansive soils or deterioration with age. One

section of fence to the southeast noted to have been offact (Radbruch,

1968) has been reconstructed. The remaining two to the north and southwest

appeared to be in their original state.

A surface reconnaissance was also conducted, following an extended period

of heavy rains, on February 1980. Linear drainages, depressions and poorly

drained areas were observed as noted on Figure III-4. Some of these fea­

tures were also observed by E. Hart of the CDMG in his reconnaissance in

about July 1979 (personal communication .• E. Hart, February 1980) and were

apparent1y related to either blocked roadways o:r drainages .

A thorough search of the area immediately around the "sag pond" noted by

previous work (CDWR, 1%3) northwest of Camp Parks, indicated that it was

apparently created when the alignment of Dougherty Road destroyed a pre­

vious drainage. A wide survey of the Amador Valley region observed large

numbers of closed depress ions, fille.d with water, frequently positioned

adjacent to roadways .

2. Other .Areas

Terrace deposits visible in the channel of Alamo Creek northwest of Camp

Pai:ks, located along an infori:ed fault trace, showed no evidence of fault­

ing (Figure II I-4).

A railroad bridge located at the south central portion of the project site

and positioned directly in line with the easternmost 1940 airphoto line­

ament, was obsP..rved to be undisturbed; as were the railroad tracks border­

ing the site in that area (Figures I-3 and 111-4) .

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A brief reconnaissance was made of Tassajara Creek, which borders a portion

of the site to the south (Figure I-3). A contact between two distinctive

soil types (dark b1'own silty clay and moderate brown sandy clay) at about

13 feet below the top of the bank, was traced ~·here exposed along the banks

of the canal between the Southern Pacific railroad bridge to the east and

Arroyo Mocha to the west. No evidence of offset in this contact was ob­

served in exposed sections of the bank.

E. SUBS\Jl\FllCE INVESTJGATION

Subsurface exploration during this inve.stigatio11 consisted of e:icc.avating a

500-foot-long trench and 5 test pits. Seven auger holes were also drilled

as par-t of a preliminary geotcchnical investigation of the s.ame property by

Wahler J\ssociates. The trenches were excavate.d with a backhoe equipped

with a 30-inch-wide bucket to an average depth of 15 feet with maximum

depth of 16 feet in places. Auger holes were dri l lcd with a 6-inch

continuous flight auger and ranged in depth from 26. 5 to 56. 5 feet. In

addition, 3 pie;>;ometer holes were also drilled to evaluate ground water

conditions near the exploratory trench. The locations of the exploratory

trench, test pits and borings are shown on Figure I-3. Detailed logs of

the trenches, test pits and the logs of the exploratory borings are con­

tained i.n Appendix J\ of this report.

1. Bor~holes

Evaluation of the subsurface conditions is based on data from boreholes

drilled recently at the project site, as well as interpretation of explora­

tory borings and t.:ell logs obtained from the J\larneda County Flood Control

and Water Conservation District, Zo11e 7 (referred to herein As tl1e Dis­

trict) and located within the project site (Figure 1-4).

The well information obtained from the files of the District are listed

below and the location of wells within the SPRR property is shown on Figures

I-3 and 1-4.

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Depth \'later Level Depth We!~ ifoct) (feet)

3S/ 1E-5Hl 93 15. 3 measured by \~rahler Associa.te~ July 16, 1981

3S/ 1E-6Q2 266 22.9 measured by ACFCllCD July 3, 1981

3S/1E-6Jl 33 filled in to 6 inches of surfocc

Our analysis of exploratory borings drilled during Wahler Associates'

preliminary geotechnical investigation, as well as logs of previous explor­

atory borings compiled by the District, indic1'tes that the site is general­

ly underlain by alluvial de.posits consisting of stiff clays ond silty

clays, interbedded witi1 thin lny<ns of sandy clay, silt, sand, and gravel>

to a maximum depth on the order of 200 foct. The surficial soils am

moderately to highly expansive cL1ys and silty clays, generally firm to

stiff in consiste11cy. Thin, water-bearir1g gravel a.nd gravelly sand laye:rs

were encountered genernl ly at depths of greater tl1an 40 feet.

Ground ~ater, or indications of free water were encountered in all seven

borings drill"d at the site by Wahler Associotes during the preliminary

geotcchniciil investigation. The ""atei: was encountered from 5. S feet (DH-

43) to about 25 feet in DH-40 and 41, ond gener"lly indicates a gradual

dot...'nward gradient to the ease.

2. Trenching

As discussed previously, the evidence cited by previous workers (CD\~~R,

1963, 1964, 1966 and 1974; Radbruch, 1968; Gibson and ll'oJlenberg, 1968;

Hart, 1981) on the Pleasanton Foult (north of Interstate 580) suggested

very recent movement. Thet"c fore, a tr~nch. excavated in the al luvj urn across

the inferred trace in the project area would eithe.r confirm or deny the

presence of active faulting ot the site. Accordingly, a 500-foot-long

Lrench was excavated across all possible interpretations of the location of

the easternmost 1940 aerial photo tonal lineam0.nt in the project urea .

The trencl1ing exploration program was performed intcrimittcntly bo.twe.en

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July 16 and August 10, 1981. The trench logs a,-c shown on Figures A-1 and

A-2 in Appendix A .

Trench wall caving in the 500-foot trench occasionally present<>d a poten­

tial hazard to personnel within the trench. However, such caving was

ordinarily limited to depths of greater than 10 feet, and except for one

20-foot section, interpolation of stratigraphic contacts could be made

based upon uninterrupted bedding above and on either side of the collapsed

zone and visual observation in the collapsed area itself. In the case of

the 20-foot section which was impossible to enter due to complete collapse,

an adjacent trench (TS-2) was excavated 25 feet to the southeast of and

parallel to the main trench (TS-1). Interpretation was extended laterally

in this case .

Due to a ground water level difference observed within the long trench,

piezomcters were installed at Stations 1+75, 1+95, nnd 2+15 (Figure A-1,

Appendix A). After a period of two weaks, measurements were taken, indi­

cating a ground water level difference between P-1 (Station 2+15) and P-2

(Station 1+95) of nearly four feet. The piezon1eter data are shown below.

Depth Below Water Level Depth Piezometer Surface of (feet)

Number Sta tip (ft) 10 Aug 81 25 Aug 81

P-l 2+15 19. 0 10. l 10.1

P-2 1+95 18.6 6.3 6.0

P-3 1+75 17.3 6.0 6.1

Another parallel trench (TS-3) was excavated 15 fe"t to the southeast of

TS-1, and adjacent to Stations 1+75 through 2+10, in order to investigate

the nature of the ground water level difference. The water level change

appears to be gradual, and no abrupt change (such as ground water barrier)

was observed.

All trenches were logged continuously and in detail by Wahler Associates'

engineering geologists. Alluvial soils exposed in the trenchos, which were

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excavated to a maximum diapth of 16.5 feet, generally conoisted of silty

clays of moderate to high plasticity, intBrbedd"d gradationally or inter­

fingei:-ed with sandy clays.

The criteria used to identify various types of soil layers which a.re arbi­

trarily numbered and shown on the lag> are applied tlnoughaut the logging

of all of the. trenches and include:

• grain size distribution,

• color changes, sometimes sharp, more often gradational~

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moisture content,

presence and/or amount of caliche,

• shell fossils or charcoal content,

• plasticity and consistency of clay layers,

• other features such as internal slickcnsidc~ and relic dessica­

tion structure.

Important featur<1s which are exposed in the trench and which have a major

impact on thls study include continuity of soil horizons, buried channels,

and inclusion of organic materials at depth, all of which are discussed

below .

Except for a. gradational color change, layer 3b is present at the base of

the trench throughout its entire length. Where it grades from bluish-gray

to grayish-brown, the nomenclature changes to 3d_: however, the layer is

otherwise unchanged. Slickensides were observed, occurring at random both

late,ally and vertically in layers 3b/3d, and occasionally in the layers

above. The slickensides ai:e limited in extent and are oriented in a random

manner. It is thought that the slickensides are related to consolidation

and/or dessication of the clays, rather than to fuulting activity .

Charcoal was found at the top of layer 3d with.in Trench TS-3 at a depth of

11. 2 feet (Station 1+90). Samples of this charcoal-bearing layer "ere sent

to the University of Arizona Laboratory of Isotope Geoch<imistry in Tucson,

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Arizona for radiocarbon dating. The results indicate a Cl4 age of 9,770 ±

400 years B. P. as shown in Appendix C. Since this layer extends to the

bottom of the tre.nch at about 15 feet, it is likely to be older at that

depth. Thfa layer remains uninterrupted throughout the length of the

trench so that it may be used as evidence that no fault movement has dis­

placed it since the tin1e of its deposition .

Two adjacent buried channels were found in Trench TS-2, both between Sta­

tions 0+40 and 0+50, at a depth of about 10 feet. Both contained a sandy

clay layer in the base of the channel which contained small pebbles and

shall fragments. Radiocarbon dating of these shell fragments indicated a

Gl4 age of 7,320 ± 610 years B.P. (Before Present).

Ground water was encountered at various depths during the excavatior1 of

Trench TS-1. The variability of ~nt, clay, or sand content within the

layers encountered, combined with their very low permeability, made it dif-

ficult to determine the exact. level of the w.~ter table in some case~. For

ex:ample, at one station, water was found ac.cumulating in the t:rench bottom

when it had only been excavated to a depth of 6 feet, but water flowed in

at a much greater rate at a depth of 12 fee.t when the trench was deepened.

Also, near Trench TS-3, a water level difference of 4 feet was measured by

piezometers only 20 feet apart; excavation of Trench TS-3, parallel to TS-1

at this reach, r<wealed a gradual saturation gradient rather than an abrupt

ground water barrier that could be ascribed to faulting.

Throughout the detailed logging of all trBnches, particular attention was

directed to identifying any features which might be representative of

active faulting. These include, but are not restricted to; offset., dis­

tortion or localized warping of horizontal soil contacts, presence of fault 11gougc 11 materials; zones of anomalous moisture; or abrupt termination of

soil horizons. No evidgnte. of any of tl1ese features was observed in any of

the trenches. Based upon our invcstigationJ it is our opjnion that no

active faulting has occurred at the site in the recent past--in Ill least

the time since deposHion of layer 3d, which has been indicated by radio­

carbon dating to be at least 9,000 years old.

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F. RADIOCARBON DATING ~--

As stated earlier, sampl<>s taken from tr,enches TS-2 and TS-3 (par.~l lel to

the 500-foot trench) wero sent to the University of Ari7.ona Laboratory of

Isotope Geochemistry in Tucson for radiocarbon (C 14) dating. The officia 1

results of the analyses are included as Appendix C. Basic de.scriptions and

age determinations of the two samples appear below, and the sample loca­

tions are shown on Figure A-1 of Appendix A.

(l)

(2)

Sample S-1, Trench TS-2

Location: Station 0+40

Depth: 9.5 feet

Description: Sandy clay of brown-gray color, with numerous

small pe.bblcs and shells. The shells are soft, mainly fragmental

and white.

C-14 Age: 7,320 ± 610 years B.P. (Before Pre"mt)

Sample S-2, Trench TS-3

Location: Station 1+90

Depth: 11.2 feet

Description: Gray-brown silty clay with some sand, and sheared

surfaces. Contains charcoal fragments, and possibly otl1er or­

ganic mutter.

C-14 Age: 9,770 ± 400 years B.P .

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PORTION OF 1951 GEOLOGIC ~AP OF THE SAN FRANCISCO 8AV REGION SHOWING LOCATION OF FAULT PASSING THROUGH PLEASANTON AREA. FROM BOWEN AND CRIPPEN (1951).

'l Wohl~r SPRR PROPERTY HACIENDA BUSINESS PARK

.A.ssoclotes ..... ....,...,.._----~~~--------~~~~-1----'-'~'~'-'-'r.,..-."~'~·~+-----,....;:'~'~'~'~----1-~-'~'~'~"~"~'~"~'~·~.....1 P~l..O ALtll • NE"IPOltT BfAl:H • D~NVER HBP-109A AUGUST 1981

1951 GEOLOGIC MAP - PLEASANTON AREA

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East Branch Pleasanton Fault

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ORDUNO SCALE

1 o.E:i°°3:=EE33::::JE3E:i':o =====:51 o1oo n

SCALE FOR VECTORS AND ELLIPSES

oC::i::nccr::=::::'.:· jo . 100 n

POSITION VECTORS AND 95% ERROR ELLIPSES 1964 TO 1965

FROM MILLER, 1970

NOTE: SEE FIGURE 111-2

~ SPRR PROPERTY

FOR LOCATION OF TRIANOULATJON NETWORK .

1964-1969 U.S. COAST AND GEODITIC SURVEY VECTOR DI AGRAM A Wahler HACIENDA BUSINESS PARK

Associates1..::":":".~~~~..,.-~"".'"'."~~------4-~~·~·0~·~"~'~"~'~·--+~~~'~'~"~..,---l-~~"~"~""~'~"~·~·--1 PALO Al.TO • NEff'Off7 1£ .. CH • OENYEi;t HBP-109A AUGUSl 1S81 \I -3

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OVERSIZED··. DOCUMENT HAS

BEEN PULLED AND SCANNED

: · WITH THE MAP FILE,.

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• FINDINGS AND CONCLUSIONS

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CHAPTER IV

FINDTNGS AND CONCLUSIONS

This chapter summarizes our findings and conclusions on the detailed in­

vestigation performed to evaluate the existence and activity of the Pleasan­

ton Fault within the SPRR property. This detailed investigation included

an extensive trenching exploration program and an update of the extensive

literature search, review and analysis, airphoto interpretation, and sur­

face reconnaissance, performed during a previous fault study by Wahler

Associates on an adjoining property to the south of the SPRR property. A

full description of this investigation can only be gained by reading the

entire text of the report. However, to make our principal findings more

readily accessible to the reader, they are summarized below.

1.

2.

The earliest known mention of faulting in the Pleasanton area is

shown on a 1951 geologic map of the San Francisco Bay Region. No

evidence is referenced to substantiate the existence of this

fault. Since that time, almost all literature or information on

the Pleasanton Fault has assumed that the fault exists .

The California Department of Water Re.sources, in their ground

water rcsources study of the Livermore Valley, appear to have

presented the first published evidence of the Pleasanton Fault,

mapping it on the bas is of airphoto lineaments, geomorphic fea­

tures and variations in ground water levels on the order of 30

feet in widely-spaced wells. Except for the single tonal line­

ament from the 1940 airphotos which passes through the project

area, most of the indirect evidence cited is for mapped traces

north of the project area (Camp Parks area), where, to our know­

ledge, the existence of faulting has not been confirmed by trench­

ing .

Project HBP-109A IV-1

Wahler Associates

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3. Right-lateral offsets in fences in the Camp Parks area have also

been reported in one investigation along mapped traces of the

Pleasanton Fault. However, no other surficial evidence consis­

tent with these observed offsets has been noted in the developed

portions of the Camp Parks area (i.e. along roadways, building

structures, railroad). Our own surface reconnaissance indicates

several areas of disturbance along fences, which are not consis­

tent with the mapped traces of the fault and which could be

alternatively explained by man-made activities or expansive

so:i ls .

4. Geodetic measurements of three networks that straddled the infer­

red traces of the Pleasanton Fault in the Camp Parks area indi­

cated an element of right lateral movement, but were not consis­

tent in aither time or in space. For example .• right-lateral

movement of 18 mm was reported during a 5-year interval from 1964

to 1969, while no movement was interpreted for the period 1969 to

1979. Furthermore, an 18 mm offset is considered significant and

would probably have been expressed on the surface by a consistent

alignment of disturbed cultural features. None have been reported

or observed .

5.

6.

7.

Detailed gravity profiles, conducted reccmtly, show local ano­

malies along mapped traces of the Pleasanton Fault; however,

al ternativc inte>pretations of the anomalie• in the gravity

profile• have also been presented and their relevance to the

fault is therefore admittedly ambiguous and inconclusive.

Recent studies relating aeromagnetic anomalies to identify fault

systems indicate no magnetic anomalies in the Pleasanton Fault

area.

The 1970 Danville earthquake swarm, centered about 6 miles north­

west of the project site, has been ascribed by some workers to

activity on a 110rthward extension of the Pleasanton Fault. The

Project HBP-109A IV-2

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seismic activity does not follow a linear trend, as is commonly

shown along known active faults in the area, but is rather concen­

trated in a roughly spherical distribution. Some investigators

have sugge$tod that the earthquake activity could be related to

some type of piercement structure .

Recent epicenter maps (1969-1974) showing epicente:rs of earth­

quakes with magnitudes of less than 0.5 to 4.5 shown rare occur­

rences of earthquake epicenters in the vicinity of the site. It

would seem reasonable to expect seismic activity on a fault that

is activoly creeping; however, no such activity is evident at the

site during the period of record.

South of the project site, several detailed studies, employing

investigative techniques including trenching, have been previous­

ly performed. All the studies reviewed found no direct evidence

to substantiate activity on or the existence of the Pleasanton

Fault. This included a 2, 000-foot-long trench excavated by

Wahler Associates immediately south of the SPRR property across

the inferred traces of the Pleasanton Fault shown in the 1974 SSZ

map of the Dublin Quadrangle. Another 200-foot-long trench was

excavated to evaluate the southward projection of a tonal linea­

ment shown in 1940 aerial photos. No evidence of Holocene fault­

ing was found in these trenches excavated by Wahler Associates.

North of the project site in the Camp Parks area, airphoto inter­

pretations of 1940 aerial photographs indicate three, well-de­

fined, strong tonal lineaments in the alluvium. These tonal

features become abruptly faint or discontinuous to the south and

north. The easternmost lineament could be traced vaguely about

2,000 feet south of Interstate 580 and onto the SPRR property.

Although these features may be artificially created, they occur

in the Holocene alluvium and may be caused by faulting .

Project HBP-109A IV-3

Wohler Associates

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11.

12.

Since the airphoto lineaments discussed above occur in the Holo­

cene alluvium, it was reasoned that trenching would disclose

evidiJ.nccs of faulting in tl1e exposed subsurf1'";lce materials.

Therefore, a 500-foot-long trench was excavated in the alluvium

across the inferred trace of tha Pleasanton Fault which passes

through the project area, as indicated by the easternmost tonal

lineamRnt on the 1940 airphotos, and by the 1981 Special Studies

Zones Preliminary Review Map.

The backhoe trenches were excavated to an average depth of 15

feet and up to a maximum of 16 feet. Based on detailed logging,

the materials exposed in the trench consist of identifiable

horizontal to nearly horizontal and i.nterfingering ] ayers of

silty clays and sandy clays, interhedded gradat:ionally .

A distinctive bluish-gray to grayish brown silty clay layer near

the bottom of the trench could be traced continuously throughout

the entire length of the trench. Radiocarbon age detei;mination

of charcoal detritus from the top of this layer at a depth of

ll.2 feet has indicated a Cl4 age of 9,770 ± 400 years B.P.

During the trenching program, it was observed that ground water

depths may var;y locally within short lateral distances, due to

compositional differences and their nffect upon permeability.

Det.~iled logging of the alluvial materials in the trenches foiled

to show any offsets, ruptures, di::stortions or. warping, presence

of fault gouge material, ground water barriers i or any other

feature that is indicative of faulting.

Based on our detailed investigation using currently availabc geo­

logical techniques, it is our conclusion that no active faulting

has occurred at the project site in at least 9 ,000 years, and

that evidence to date for the existence of the Pleasanton Fault

at the project site is indirect~ inconclusive and unsubstantiated

by the information currently availahle .

Project HBP-109A IV-4 Wahler Associates

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• REFERENCES

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REFERENCES

Applied Soil Mechanics Inc .. • (1975), Geologic and Seismic Hazards Investiga­tion, Tract 3606, Pleasanton, California.

-----' (1977), Geologic and Seismic Hazards Investigation, Creeks Bend Subdivision, Tract 3359, Pleasanton, California .

Bennett, J., (1979), Memorandum letter to E. Hart, California Division of Mines and Geology, San Francisco, from J. Bennett, CDMG, Sacramento, dated September 6, 1979; Subject: Pleasanton Fault Horizontal and Vertical Movement Data.

Bowen, O.E., and Crippen, R.A., (1951), Geologic Map of San Francisco Bay Region in Geologic Guidebook of the San Francisco Bay Counties, California Division of Mines, Bulletin 154.

Branner, J.C., (1912), Report on the Geology of Livermore Valley, in the Future Water Supply of Sau Francisco, Spring Valley Water Supply Company .

Brown, R.D. Jr., (1970), Historically Active Faults, San Francisco Bay Area: Basic Data Contribution No. 1, San Francisco Bay Region Environ­ment and Resources Planning Study, U.S.G.S.

Brown, R.D., and Lee, W.H.K., (1971), Active Faults and Preliminary Earth­quake Epicenters (1969-1970) in the SoutheTn Part of tho San Francisco Bay Region, Basic Data Contribut:ion 30, San Fr,lncisco Bay Region Environment and Resources Planning Study U.S. G. S.

Burkland and Associates, (1974), Supplementary Report Geologic and Seismic Hazards Investigation, Valley Memorial Hospital, Pleasanton, California September 1974.

_____ , (1975), Suppl<>ment 2 to the Geologic and Seismic Hazards Investi­gation, Valley Memorial Hospital, Pleasanton, California, January 1975 .

Byerly, P., (1951), History of Earthquakes in the San Francsico Bay Area; in Geologic Guidebook of the San Francisco Bay Counties, California Division of Hines, Bulletin 154.

California Dep11nment of Water Resources, (1963), Alameda County Investi­gation, Bulle.tin 13 .

---~-, ( 1964), Alameda Creek Watershed Above Ni lcs.

(1966), Evaluation of Ground Water Resources, Livermore and Sunol Valley, Bulletin 118-2, Appendix A, Geology .

---~-' (1974), Water Resources of Livermore and Sunol Valleys, Bulletin 118-2 (revised edition, June 1974).

Project HBP-109A R-1

Wahler Associates

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California Division of Mines and Geology, (1974), Special Studies Zones; Dublin Quadrangle .

California Division of Mines and Geolgoy, (1981), Special Studies Zones, Dublin Quadrangle, Preliminary Review Map of July 1, 1981.

Carpenter, D., (1975), Geologic Evaluation of Proposed East County Govern­ment Center, Sunol Boulevard Site, Pleasanton, California, County of Alameda, Public Works Department .

Dibblee, T. W. , Jr. , (1980), Preliminary Geologic Map of the Dublin Quad­rangle, Alameda and Contra Costa Counties, California: U.S. Geologi­cal Survey Open-File Report 80-537.

Earth Sciences Associates, (197 Sa), Fault Investigation, Library Addition Amador Valley High School, Pleasanton, California

____ , (1975b), Fault Investigation, Phase II, Library Investigation, Amador Valley High School, Pleasanton, California.

, (1979), Geologic Investigation, Phase II, General Electric Test ----Reactor Site .• Vallecitos, California.

Ellsworth, W.L., and Marks, S.M., (1980), Seismicity of the Livermore Valley, California Region 1969-1979; U.S. Geological Survey Open-File Report 80-515 .

Engeo, Inc., (1979), Seismic Hazards Exploration, Komandorski Village, Pleasanton, California, l!ay 7, 1979.

Ford, R.S., (1969), Groundwater Geology of Livermore Valley - A Satellite Urban Area: Urban Environmental Geology in the San Francisco Bay Region, Special Publication .

, (1975), Most Recent California Department of Water Resources Well ----Data, Letter to Murray Levish dated January 13, 1975 from R. Ford, in Burkland and Associates, 1975.

Funkhouser, L.W., (1948), The Geology of the Arroyo dcl Valle Area, Alameda County, California, Unpublished Masters Thesis, Stanford University.

Geological Society of Sacramento, (1959), Field Trip Guide: Coast Ranges, Livermore Valley to Hollister, 19 p., maps.

Gibson, W.M., and Wollenberg, H.A., (1968), Investigation for Ground Sta­bility in the Vicinity of the Calaveras Fault, Livermore and Amador Valleys, Alameda County, California, Geological Society of America Bulletin 1, v. 79, pp. 627-638.

Greensfelder, R.W., (1974), Maximum Credible Rock Acceleration from Earth­quakes in California, California Division of Mines and Geo logy, Map Sheet 23.

Project HBP-109A R-2

Wohler Associates

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G.-iscom, A., Roberts, C.W., and Harden, K.D., (1979), Gravity Data and Interpretation of Detailed Gravity Profiles in the Livermore Valley Aren, California; U.S. Geological Survey Open-File Report 79-549 .

Gutenberg, B., and Richter, C.F., (1954), Seismicity of the Earth, Prince­ton Press, Lists Earthquakes 1904-1952 of Magnitudes 5.3 and Greater.

Hall, C.A., (1958), Geology and Paleontology of the Pleasanton Area, Alameda and Contra Costa County, California, University of California, Publica­tion in Geological Science, v. 24, No. 1.

Hanna, W.F., and Brabb, E.E., (1979), Naps Showing Aeromagnetic Anomalies, Faults, Earthquake Epicenters, and Igeous and Volcanic Rocks in the Southern San Francisco Bay Region, California; U.S. Geological Survey Open-File Report 79-827 .

Harding, Miller, Lawson & Associates, (1972), Supplementary Report Seismic Risk Assessment, l!opyard Road Site, Neai: Pleasanton, California, February 1972.

Hart, E.W., (1980), Fault-Rupture Hazard Zones in California, California Division of Hines and G"ology, Special Publication 42, Revised March 1980.

~~~~' (1981), Pleasanton and Related Faults, Dublin Quadrangle: Califor­nia Division of Hines and Geology Fault Evaluation Report FER109 (unpublished) .

Herd, D., (1978), Nap of Quaternary Faulting Along the Northern Calaveras Fault Zone: U.S. Geologic Survey Open-File Report.

Jenkins, O., (1938), Geologic Map of California, California Division of Mines .

Jennings, C.W., (1975), Fault Nap of California, California Division of Mines and Geology, Geologic Data Hap Series, Map 1.

Johnson, R., (1980), Personal Communications, Alameda County Flood Control and Water Conservation District, Febrnary 25, 1980 .

Judd Hull and Associates, (1977), Geologic Investigation for Proposed Civic Center Additions, Pleasanton, California.

Lawson, A.C. (1912), Report on the Geology and Underground Water Supply of Livermore Valley, in the Future Watar Supply of San Francisco~ Spring Valley Water Supply Company.

Lee, W.1!.K., Eaton, M.S., and Brabb, E.E., (1971), Earthquake Sequence Near Danville, California, 1970, Bulletin Seismology Society of America, v. 61, No. 6 .

Project HBP-109A R-3

Wahler Associates

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Hiller, R.W., (1970), Study of Earth Movement Determined by Triangulation, Camp Parks Vicinity of Pleasanton, California, Supplement No. 1, U.S. Coast and Geodetic Survey, Unpublished Report .

Parkins, E.J., (1965), Report Camp Parks Vicinity of Pleasanton, California, Study of Earth t!ov.,mcnt Determined by Triangulation, U.S. Coast and Geodetic Survey, Unpublished Report.

Radbruch, D.H., (1968), New Evidence of Historical Fault Activity in Ala­meda, Contra Costa and Santa Clara Counties, California, Stanford University Publications Geological Science Volume XI pp 45-54.

Real, C.R., Toppozada, T.R., and Park, D.L., (1978), Earthquake Epicenter Map of California, 1900-1974, California Division of Mines and Geology, Map Sheet 39 .

Richter, Charles F., (1958), Elementary Seismology, W.H. Freeman & Company, San Francisco) California.

Schlocker, J., (1970), Generalized ~lap of the San Francisco llay Region, California, U.S. Geological Survey Open-File flap .

Terrasearch, Inc., (1979), Geotechnical Investigation, 600-acro parcel, Dougherty Hills, Alameda and Contra Costa Counties, Phases I and II; Unpubl ishcd Consul ting Report for Kremco, Tnc.

Thompson and West, (1878), Official and Historical Atlas Map of Alameda County, 1878; reprinted as 1976 Bicentennial Edition, Valley Publish­ing Company) Fresno.

Tocher, D., (1959), Se.smic History of the San Francisco Bay Reg.ion, in Oakeshott, G.B., ed., San Francisco Earthquake of March 1957, Califor­nia Division of Mines Special Report 57 .

Toppozada, T.R., Real, C.R., and Pierzinski .• D.C., Seismicity of California January 1975 through March 1979: California Geology v. 32, No. 7 July 1979.

Townley, S.D., and Allen, f!.W., (1939), Descriptive Catalogue of Earth­quakes of the Pacific Coast of te United States 1769 to 1928; Bulletin Seismology Society of Anierica, v. 29, No. 1.

U.S. Geological Survey, (1972), Seismicity l!ap of Greater San Francisco Area, California, 1969-1971, Open-File Hap .

Wahler Associates, (1980a), Geologic and Fault Investigation, Pleasanton Business Park, (Willow Wost Property), Pleasanton, California: Cnpub­lished Consul ting Report for CPS & Associates.

---- , (1980b), Preliminary Geotechnical Evaluation, Pleasanton Business Park, Pleasanton, California: Unpublished Consul'ting Report fot" CPS & Associates.

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Wire, J.C., (1972), Geological and Geophysical Investigation Proximity of the Pleasanton Fault to the Walnut Grove School, Pleasanton, Califor­nia .

Yadon, D.M., and Wright, R.H., (1979), Evidence for Recent l'aulting in the Pleasanton Area, California, in l'ield Trip Guide for the G<!ological Society of America, 75th Annual Cordilleran Section Meeting, San Jose, California, April 1979 .

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• APPENDIX A

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r f-­Q..

UJ a

rs

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TRENCH NO. TS-1 , T S-2 ANO TS-3 LOG OF SOUTH WALL

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SPAR PROPERTY

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TRENCH NO TS-1 LOG Of SOUTH WALL

I DUI: FIGIJI! MD.

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SHEET No.1 of 4 DATE LOGGED 7 /16/81 LOGGED BY K. B.

RIG J.D •. 310 A (J. & W. Construction) PIT WIDTH 24"

PIT ND. DEPT" IN FEET SOil TYPE DESCRIPTION

TPS-1 o.o- 3.3 CL-CH Trend N75E

3.3-10.0 CH

10.0-11.5 CL-CH

11. 5-12. 3 CL-CH

SILTY CLAY: medium brown; firm to stiff; dessication cracks and grass roots to 6"; slightly damp.

3.0-3.3 - Traces of caliche (white) and orange mottling; traces of fine gravel (to 1/4") and coarse sand.

CLAY: dark gray-brown; moderate to high S-1 plasticity; stiff; slightly damp; tr,.ce.s of charcoal and fine sand .

6 '-10' - Medium brown; traces of c·aliche; moderate plasticity; damp.

SILTY CLAY: light yellow-brown;· son1e finE sand grains;. moderate p_l'asticity; damp ..

SILTY CLAY: dark brown-gray; moist to wet; firm; moderate plasticity; trac.es of fine sand.· . ,

I , 12.0 - Ground-water encountered •

W. A. WA HUR SPRR PROPERTY TEST p IT LDGS

& ASSOCIA HS .__...,...HA_c_I_E_ND_A_IJ_u_s_IN_E_· s_s_P_A_RK _ _..,t---='=-' ',-'-' -"-' '--!-'.-'---"-'-' ---r'--'-"-'-' '-'-"-'--t PllO llTO • lllfll'O~T lflC~ • Clllf HRP . . irr.r\~ I AJTl'""TT,..m il'\Ql I

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SHEET No. 2 of 4 DATE LOGGED 7 /16/ 81 LOGGED BY K. B.

RIG J.D .. 310A (J. & W. Construction) PIT WI OTH 24"

PIT NO. DEPTH IN FEET SOIL TTPE

TPS-2 _Trend N47W

o.o- 3.0

3.0-.8.5

CL-CH

CL-CH

OESCRI PT I OH

SILTY CLAY: dark gray; slightly damp; firm to stiff; moderate plasticity; dessication cracks to 1.5' roots to 311 .

SILTY CLAY: green-gray to medium brown­gray; moderate .. plasticity; firm; some very fine and ve~y aoarse sand; some orange mottling and organic material.

SAMPLE

4'-8.5' - (Gradational Contact); S-1

8.5- 9:0 CL

9.0-11.0 CH

11. 0-16. 0 ML-CL

becomes moderate to highly plastic· damp, with very fine grained sand -becoming more silty towards lower contact.

SANDY CLAY: gray-browo; with 50% medium to fine sand; some orange mottling; slightly plastic; wet.

I 9.0 - Ground-water encountered flowing from SE end of trench at about 1/2 gal./minute •

CLAY: grayish-brown with yellow-brown mottling; dirty white caliche; highly plastic; moist.

SANDY SILT: browoish-gray; contains considerable clay; low plasticity; soft; contains very find sand grains.

Caving of trench sides at 11-13'. Ground-water encountered at 11.0'. Flow: 10 cu. ft. /hr •

S-2

S-3

IV.A. WAHUR SPRR PROPERTY TEST PIT LOGS

& ASSOCIAHS .._ __ HA __ cr_E_.ND_A_B_us_r_N_E_s_s __ PA_RK---1---:.,.,",.,,',.;;"~".,,.,,.",......-1-:-:-:l==-'•',,"c=--Jl-~'-"-*-"-'-'-'--t 11'.llO ll!O • 111(1',.0llf l!IEACM • C~ll' H~P-109A. !AUGUST 1981 l

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SHEET No. 3 of 4 DATE LOGGED 7/16/81 LOGGED BY K. B.

RIG J.D. · 310 (J. & W. Construction) PIT WIDTH 24"

PIT HO. DEPTH IH FEET SOIL TYPE

TPS-3

Trend N66E

0.0- 3.5

3.5-10.3

10.3-14.0

14.0-16.0

TPS-4 0.0- 6.0

Tre.nd N82E

6.0-14.5

CH

CL-CH

ML-CL

CL

CH

CL-Cll

DESCRIPTION

SILTY CLAY: dark gray; dessication c.racks to 1.5'; roots to 6"; stiff; moderate plasticity; slightly damp.

2-3.5 - Dark brown-gray, wi~h white caliche and orange mottling; firm to stiff; damp.

SILTY CLAY: medium gray-brown; moderate plasticity; firm to stiff; some very fine sand grains .

7-10.3-Medium brown; with increas­ing percentage medium to fine sand grains; becoming "oarser (to 1/8") and sandier with depth. Graded contact at base .

SANDY SILT! medium brown; poorly com­pacted; with lenses at 10.3'and 13' of:

10.3-11.0, 13.0-13.5-GRAVEL: gray­brown lenses; grading coarser with depth up to pebble size; poor sorting; poor cementation; some clay present; slightly plastic; sub-rounded quartz, chert and mafic grains; about 10% clay. Grades at base into silty "lay •

SILTY CLAY: yellow-brown; moderately plastic; moist.

CLAY: medium gray; dessicat;ion cracks to ]. . . 5' and roots to 6"; medium plas­ti.city; slightly damp.

r 2.0-6.0 Gray-brown with white .caliche; firm; slightly sandy; becoming damp witl1 depth .

SILTY CLAY: medium yellow-brown with· fine sand grains at top, becoming scarce with depth; moderate plasticity; firm; clay content and plasticity vary with depth .

SPRR PROPERTY TEST PIT LOGS

SlMP~E

W_ A_ WAHUH HACIENDA BUSINESS PARK & ASS 0 CI AH S .__.,.,.,.~...,.,.--..,..,..,.~,,.,.,..,.,...-,..,..,.._r----i'"'';"E",..'.,.."=-' '.--11r.tt=:::::-'-;"~'-;;-;---t1 --'-"-'-"-'-"-'--;

jl'1LO i.LlO • 111Et'c•r 8f..&CM • c•L1f HBP-l09A IAUGUST 1081 I

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SHEET Ha. 4 of 4 DATE LOGGED 7/16/81 LOGGED BY K. B.

RIG J.D .. 310 A (J. & W. Construction) PIT WIDTH 24"

PIT ND. DEPTH IN FEET SDIL TYPE

TPS-5 0.0- 4.7 Trend N46W

4.7- 7.0

7.0-15.0

ML-SM

SM

CL-CH

DESCRIPTION

SANDY SILT: gray-brown; dessication to 6"; poorly compacted with some clay and low plasticity; 30-40% fine sand grains; slightly damp .

I 3.0-3.3 SILT/SAND: lens; silt is yellow; grading laterally into poorly sorted brown sand, both are slightly damp and contain slight orange mottling .

3.3-4.7' CLAYEY SILT: yellow-brown with caliche and rootlets; some sand grains; slight plasticity.

SILTY SAND: light yellow-hrown with about 40% fines; moderate compaction; slightly damp, becoming damp at about 5.5'.

S.S-7.0 Damp, with an increase in clay content and slight plasticity.

SILTY CLAY: gray-brown; moderately plas­tic with some very fine sand grains, dark brown mottling and light gray caliche; damp.

11-13' light yellow-brown; about 20% medlum sand grains.

I 13.0-15.0 dark gray, with streaks of light gray caliche and no sand grains .

W.A. WAHlfA SPRR PROPERTY TEST PIT LOGS

SAMPLE

HACIENDA BUSINESS PARK & ASSilCIAHS 1-------------+----,.,.,",.,,',..".,-"~",..-'-t-.-'==':-'-:".,,.,,,,--;ir---'-'-"-' -"--"'--t

il'a1,.o t.ltO 41 "'•'!U'f •(.ac111 • ~;.L,, HBP tr q.1 I l\nr:nc:.,, 100:1 I

• BORING LOCATION See Site Map (Figure I-3) OROUflD EL. 34 7. 5' a""l'. OEPTH1ELEV. WA !ER 28. 0 ft. 1 OR I LL CONTRACTOR u ,, '·' ....,. , ..;: 1 1 .I TOTH DEPTH "~ 'i < • DRILL RIG CME 75 I BORING DIA. " .. '~ I DATE DRILLED "/•;,, RI LOGGECI BY ___

• SOIL

DESCRIPTION OEPTll SAMPLE 1% REC. MOOE REMARKS

CLASS . NO. a

SM FILL; GRAVELLY SAND WITH FINES: 0 - AD

Blocks of concrete -~

light brown and gray-brown~ Jry on -surface . -.... -.... -.... to damp; uncornpac.ted. - !l -.... - SP-1 5 l. 5 DR : -... - 1.5 -... 6 -.... -

• -I--.... -

~ - -.... . AD -.... - -.... - -..... - -... - -'- - -..... - -..... - -I- 5 - -I- -'- - ' -'- - 4 1. 5 DR -... - -... - SP-2 3 1. 5 -- - I. --... - -... CL- SILTY CLAY: dark brown with - AD -... - --=-CH orange-brown; moist to -wet; stiff. - --• -- -- -- - -- p -- S-1 200 2.5 -- - -- - 2.5 -I- - psi -L-

10 .: -L- -.... -.... -.... - -• -.... - -.... - AD -.... -.... - -,_ - -

L- - -L- - -.... - --- -t CH dark brown, - -CLAY: moist to wet! - -I- - -.... stiff; highly plastic:. Trace of - --.... sand inclusions~ light brown. - -.... - -...

15 - -..... 100 -L- -.... - p -- S-2 psi 0.8 - -- - -- - 2.5 -'- - 350 ... - --- - psi -- -- --- - -- - AD '- - ::-'- - -'- - 19.6 feet; water -- -... -... 7/28/81 - PH -... - -- -

~ 20- -• -- - -... - -'- -'- -... - 100 -p -... -

• -'- CH - psi 2.S -'- CLAY: greenish, orange- brown; - -.... - S-3 2.5 -..... very moist: firm. Highly plas- - 200 -,_ - -.... tic. - -.... - ipsi -.... - -.... - AD -.... -.... - -.... - -.... • - -~ -

• '~~Wcr,\er EXPLORATION BORING LOG SCR I HG HO. SPRR PROPERTY P•;nE::t ._0, I $111 (I[' ,,.

Asscc:::!es HACIENDA BUSINESS PARK ttt'1'-1U~A I I •• 0 Dl!-36

• SORING LOCATION See Site Man (Fiqure I-31 GROUllO EL.347. 5 1 aoor

OEPTH1ELEV. UTER 28.0 ft. I OR I LL CONTRACTOR H.E.W. Drilling TOTAL OEPTH 56.5 ft. DRILL RIO CME 75 I BORING 0 IA. 6 inch I DA TE ORI LLEo 7/24/1981 LOGGED BY WDP

• SOIL

OESCRIPT I ON OEPTll SA"PLE %1 REC. MOOE REMARKS CLASS. NO. 0

- CH CLAY: greenish, orange..-brown!" ver; 25- AD -: - -moist: f irn1. (Cont:.) - -- - -... - : ... -... - -... - -• -... -... - -'- - -'-- - -... ~ wet • - 28.0 ft. water first: -... - -'-- - encountered -... - -- . -- - -- - -- - -• •30 -,_

-... - 150 ... - p -- ·. - S-4 psi 2.5 -- - -- - 2.5 -- - -- - 400 -- - -- - 'Si -- -- - -• - - AD -- - . -- - -- - -- - -- - -- - -- - -- 35-: ---- - -- - -... - -• ... - -- - -- - -- - -... - -,_ - -- - -- - -- - -... - -... - -- - -• . - - -- -- - --~ 40 - -- 4 -... - SP-3 D ... - 6 l. 5 -- - -- - 7 1.5 --- - -• -- - AD -- -- - -- - -- - -- -- - --- - -- - -- -- - --- -

• -- 45-:: -- -- -- - -... . -,_ - -,_ - -- - -... - -,_ - --,_ - -... - . ,_ -• -,_ - . ,_ - . ... - . - . ,_ . . ,_ CL SA.c"-lDY CLAY: oran&e- brown; - . ... very - -,__ moist; firm. so-

• \Y EXPLOUTIO~ BORING LOG eCRING NO. •"- Wch!er SPRR PROPERTY

HACIENDA BUSINESS PARK 11' 41 1)1 ~ :t '10' I Ult t. t 1110. Asscciclrts HBP-!09A I ? .. ' DH-36

• BORING LOCATION See Site Map (Figure I-3) ~ROUND EL.347. 5 'a~~r DE PTH1ELEV. WATER 28.0 ft. I DRILL CONTRACTOR H, E, W, Drilling TOTAL DEPTH 56.5 ft. ORILL RIG CME 75 leaRING DIA_ i; in~ ... I oATE OR I LLED 7"'·" LOGGED BY WDP

• SOIL

DESCRIPTION DEPTll SAMPLE ~ REC. MOOE REMAR!S CLASS. NO. RQO

- CL SANDY CLAY: orange-brown; 50 - very - -... moist; firm. - s-s 400 0.0 p -... - -... - psi 2.5 : ... -... - Hole caving in. -- - -- - -- - -- -- - -- - -- - -- Increasing sand; less plast.ic:.. - -'-- - -- - AD -- - -- - -'' y;- ---- - 1 -- SM SILTY SAND: brown with - SP-4 1.5 D -~ orange - 2 -~ pockets; loose. - 1.5 -~ very - 0 -- -- - -- BORING TERMINATED AT 56.S FT. - -- - -

• '- level after drilling - -,_ Water - -... - -- 18.7 ft. - -- - -·- - -·- - -- - -- - -- 60 .: -' -'- - -~ - -'- - -~ - -• '- - -~ - -,_ - -'-- - -'-- - -'- - -- - -'-- - -L.. - -~ - -~ - -,_ - -

• ~ - -' - - -~

6~ -

'-- -... - -~ - -~ - -' - - -... - -~ - -~ - -'-- - -• L.. - -~ - -~ - -~ - -~ - -~ - -~ - -,_ - -~ DHA ~~ rwr~ 1.l'IG A~~-~ ~p~~c)\!"IAT::·~ Of 'Ml! - -,_ r.r1.1«.rr A\D ~i111·•r.>(E: Cl·~ol~l."' ih'Al~t - -

• L.. TII~ hf1>i•:Hl\1N _.,~ l'~fAl~t~ tm~T l'DIXlL"T, - -~

~!~CO"'l'l~LL~~. "~ t'<.'~~l~LY !!;~l'.K~lD 'A~· 10--;; -Pll•~ ,.:u:-~•uno '1 '"~ L!)' ~>:A~C·DLA>!•TI:• -'-- ~o':tJ:~ ~·'f.1•'1 A~D H~~ B!!~!~I; ll~l.U lfWl

'-- hKIH~M ~c">~\,l•A;lc'~' I~ ':"IH3 ~[GAR~ UCA!:~[ - 3 '-- ~1· ~~ ~H'1 f'J \~[ ORLLLI~" r1.1:;0 A.~D1n1 -L. l:A3!11G 1.~ 1.uvi.."11:1.~" nnu:s -.... -... TllU TilG l\Drr.ATI:~ r.''~~1Tli1~~ !~ 1111~ H~LE - -l-

~~l.Y '" ·~· om 1,n1c•.11rn "' . ., ~~r - -••PRr~prr ('.1\l,DITI~~~ ~t \l~HOll: l<il.'.\r:·.!"3 A~l:I

'-- ~~ OThl~ (••Tr,~ ~~~ ~·AflK LJ:.~h,11 ~~~ UC - -'-- Sl.&J[~·t ·ti:J '~I IATl~~. - -'--- - -L. nti5 H<'l.I ~·.11 Li:i;i;co rs ~1'r.11 A I.AT i..~ m - -

• L l'MOV!Ot 01.,A l'N:~.1R1:v rnR nr,~rr.~ P\Ri'\""c~r.~ - -... A~l:I !<llJT ~t~tS3UlLY r.lR TII[ l'l:U-1131'.S ar ~M:- - -l:l~LC t:~AL"TOH. -... -L. :l![ 3TI.ATlrtCAT!t!['j LI'l'U OR nu•nr !' .. "TU\'AIJI - -L. Rt~nn~ Tl!t Al'~M~~!'\ATI: llX'~ll.IRT•~ U.1"\".r~ - -'-

Y.JITU!AL n~n. AHi,\ Tlll Tl!.A.~~rr1.-...1 ~u II - -L-

G~AL. - -L !JJIL C!.113S\Yll:AtH.1!'13 S~ !fl l.!X".S AH Jllr.11 - -'--- t:UISSlr!CATli.ll'l3 &Asto ''tll nu: 1.1'Ul[ll SOll.:1 75- -

CUl5Ul"lCA710i'I SISTI:~.

• '~~Wchler SPRR PROPERTY EXPLORATION SORING LOG ecR I hG hO. HAC1E~1JA BUSlNESS PARK P' I :l J ( !;: T "- I SM f. ( f •O.

Assccic!es HBP-109A I 3 I' 3 DH-36

• BORING LOCAllON ;, __ qHo M-- ("O • T .~, CROUND EL; .... , 1 ,.., 1 _

DEPJH1ELEV. WATER 19.0' I DR I LL CONTRACTOR TOJAL DEPTH 30 ft. .

!!.E.W. Drillinry DRILL RIG CME 75 ieoRING 0 IA. 6 inch IDAIEORILLED 7 I '• /Q LOGCED BY TA

• SOIL

DESCRIPJION DEPTH SAMPLE r~ REC. ~ODE RrnARKS CLASS. NO. 0

~ TOPSOIL: loosened by cultivation. 0 - AD -L - -L. - -L - --L. - -': CL- SILTY CLAY: brown; stiff; moist. - -- -

• :::: CH - 2.5 -- S-1 600 p -- - 2.5 -- - psi -~ - -~ - -'- --'- - --~ - -

• '=.CH~ SILTY CLAY: orange-brown; moist; - 600 2.5 p -

s..: S-2 -=-CL stiff. psi 2.5 -- -·- - -'- " - -L. ··-L. - -L - -- - -- - AD -- - -- - - -- - -- - -• ,_ - -L. - -L. - -L - -L - -L - -L - -· ~ 10-:: -,_ -L. - -

• L. - Water at 11. 7 ft; on : L. -L. - 7/28/81 --L. - -L -'. CH CLAY: OJ; ange-brown; firm; moist; - -'- - -L. highly plastic. - 450 ,L.2._ -L : S-3 -~ psi 2.5 p -L. - -L. - -~ - -• L - ---L -L. -L... 15 - -L - -L. - -L. - -L - -, __ - AD -L. - -L. - -L. - -• ' - -'- - -L. - -L. - Ground-wui:cr -'- - encoun- -'- : tered at 19 ft. -L.. -L ---L. -L ·- -' - - -'- 20: -L.. SM SILTY SAND: brown; loose; S-4 0.0 -L.. wet. - p -L.. - --- -L.. - 2.5 -L - -,_ -' - 4 l. 5 D -L.. - --L - SP-1 4 1.5 -'- - --- " -L -'. CL SANDY CLAY: brown; firm; wet. - -L. -L. - -L - AD -'- - .

-'- - -~ • - -~ 25-

• '" SPRR PROPERTY EXPLDRAT ION SORl~G LOG ecRl~G NO. ... 1..Wchier

HACIENDA BUSINESS PARK "•'l/f:Ct "''· ~ s."' t t r 1111:1.

Asscc:::!es HBP-109A 1 •• 2 DH-37

• BORING LllClTIQN See Site Map (Fi~rnre I-3) GROUl<O EL 341, o 'aoni OEPTH1ELEV. WA !ER 19.0 ft. I DRILL CONTRACTOR !!.E.W. Drilling TOTAL DEPTH 30 ft. DR Ill RIG CME 75 I BORING DIA. 6 inch I DA TE DRILLED 7/0!./< lDCHH;D BY

~·

• SOIL

DESCRIPTION DEPTll SAMPLE ~ REC. MOOE REMAR~S '.LASS. NO. D

~CL SANDY CLAY: b"t:"own; firm; wet. 25-: -. L. . . ~ .

AD .

L. . . L. . -L. . -L. . -~ - -• L. - -L- - -~ . -~ --~ . -'- - -'- . -L. . p -L.. . S-5 o.o -L.. . -

• L.. . 2.5 -L- 30-: -L. -L. ..

4 1.5 . '- SILTY CLAY: orange-brown; stiff . . '-CL- . SP-2 6 1.5 D . t:: CH moist. . . very . , . . '- . . L- .BORING TERMINATED AT 32.0 FT. - -: '- . '- . . • .. . . .. - : '- .

Wa t":r: level after . '- . '- . . '- - drilling 13.0 ft. -'- 35.:

. L.. -'- - -- - . - - -- - -• - - -- . -- - -- . -- - -- - -- - -- - -- - -- - -- - --- .

• -- - -'- - . - 40..: --- . -- - . - . . - . . - . -- - -- . -- . -• - . -- - -: - -- . -- . -.. - . .. - : '- -

• . .. DATA Oii 7111$ !.O!i ~[ H APPl'f()~Jl'tllTJON Dr Tiii - . ... C.lOUIGIC l..•ll ~UUL"Ul.i'.I: rclfobLT!WIS UCA!l:U - -'- Tiii: llm"l~~·t10N IM.~ ~Ahl~rn fRDl'I UllllUC?, -

L.. lll~Cl'JNTlN~ilJl!li, I.Im l'(t:1~1HI Ul~T1111Ull ~!ill- 45- -~ n!MG tn;q...,JUTIC!> .. LJ<~ vf ~MU·!llNmT>:• - -

MnrJ:~. fl<.•rA111 A)ffi ~·:.H to!KING tte>U.~ MA"'I ~

nlllTIIU ~<!~1UCAT1i'>rl:ll I~ lHI~ MLGfJIJI R~C.All~~ - 3 ~ nr T1IJ: "'tll'.l TO !I~[ n~ I LLIH!.' rLU!ll Alll)/Oll -~ Cl.!!INr. IN IWVAl!o::IWn Mc'>J.l~, -'-TNI~ u.: lllD!r..tn.8 (0M'(llfl'I~~ lM ?!In Jl(ILI - . '- 11ritv '-'~ na o~rg 1.•Lil•.o.rn A"1l ~Y ~;;·t - . ~ ~~~~i:~U•T COllillH<J~~ Ar onru l.i'>CA~[(lri~ AllD - . ~ I)" l.l'r!Lt:.11 OAn:~ Al''r WATU u:vu • .a. ~*11111 All.It - . ,_ 5~D.JllT TO V.IRfAtJ()M. - -~ - -~ Tltl~ HOl.l II~ UJ&G~D IM .~ll~H A ..,.AT "-~ ro -

• -'- rl!O'l'l!I~ n~T~ UI~!I.Y ,,..,~ ~f~l!ill rU11ro:i;~1 -AHO NnT N"H~~5All"ILY rn.11 nni: P~f'r.llll 01 ~n:- - .

~ CJllC <.l)~l'RAL"TOJll. -~ - -~ Tiii! ~'l'JLl.fIFIU.THllll L!ot:j. Qtli Deni! lll"ITll'V'[;!I . . ... Hrll~k~I'\' Tiii .O.Pl'!Wlll]¥l'l! ~'l!llDM/11~ R~.1'\.U~ - . L. 11.'.TUIAL nrn, ~ fl(! f.llAH~JTIOll~ II.\( u -••ll.l.rll!~L -~ - -'- ;~~~;·~=~~~~T!.:~D~:.l'oll f! ~\~~:,11: i~~::: - -L.. so-<l.A~~lf"l•ATTON ~HTI.lo

• \~~Wchler EXP LOR AT IO~ BORING LOG ECRlNG NO. SPRR PROPERTY ii"• o J £: r •O. I SK f,; l f ...

As=ociates HACIENDA BUSINESS PARll" HBP-109A l 2 ., 2 DH-17

• BORING LOCATION See Site Man ·rFi~ure I-J) GROU•m EL.JJ6.5'Annr DEPTH1ELEV. WATER 14.0 ft. 1 DR I LL CONTRACTOR H.E.W. Drilling TOTAL OEPTH50.0 ft. DRILL RIG CME 75 I BOA ING DIA. 6 inch I DA TE OR I LL(O 7-27-81 LOGGED BY W.D.P.

• SOIL

DESCRIPTION DEPTll SA~PLE % REC. MOOE REMA R'S cuss . NO, ROD

- 0- AD -- CL SILTY CLAY: 9. ark brown: dry to - -- -

• - 1.0'; moist below: stiff. - -- - : - - 400 2.5 p - - S-1 -- - 2.5 -- - psi -- - -- ·- -- - -- -- - -- -

40~ -- - S-2 2.3 -- - ps p -- - -- - 300 2.5 -.. - -• ' 5- psi -- - -L.. -~ CL- SILTY CLAY: orange-brown; moist, - -- CH stiff. - -- - AD --· - -- - -~ - -~ - -I- - -,_ - -• '- - -- - -- - -

·- - -... - -- - -- - -... - -I- 10-: -'- -~ - -~ - -~ - -• ~ - -~ - -~ - -'- - -'- - -'- - -,_ - -'- -.. - -~ - -

• L - S-3 100 0.0 p -~ - 14.0 ft. Water first -~ - psi 2.S -~ - encountered -~ - -··-· CH CLAY with silt and sand inclu- 15-: 400 -L.. - _, -~ sions; greenish, orange-:Orown -~ - -

• • nnd light gray; wet; firm; - 100 -'- - 2.3 -~ highly plastic. - S-4 psi p -~ - 2.5 -L.. - 600 -L.. - -'-- - psi -L - -L -L.. - -L.. - -'- - -~ - -~ - -~ - AD -I... - -

• 20-: -L -L ML SANDY SILT: gcecnish-brown; wet; - -... - -L loose to medium dense. - -~ - -I- - -I- - -L -L - -

• L- - 450 0.0 -L - -L - S-5 psi p . I- - 2.5 -I- - . '- - -'- - --I- -I- .

-'- • - -'- 25-

• '~~Wch!er SPRR PROPERTY EXP LOR AT 10~ BORl~G LOG BORING NO. HACIENDA BUSINESS PARK f'•;JJf:f "'°'· I $11[£ r ~Q.

Associctes ttlll'-lU~t\ I 1., 2 DH-38

• BOR I NC LOCU I ON See Site Mao (Figure I-3) GROUt<O ELoo<,5•

, __ x

DE PTH1ElEV. WATER 14.0 ft. I DRILL CONTRACTOR H.E.W. Drilling TOTAL DEPTH 50.0 ft. CRILL RIG CME 75 I BORING o IA.· 6 inc:h I DATE DRILLED 7 27 -R" LOGGED BY 1,1 n ,.,

• SOIL

DESCRIPTION DEPTll SAMPLE %1 REC. MODE REMlRKS CLASS. NO . a

~

25 - "'.: ~ ML SANDY SIL Tl (Cont'd) ~ - SP-1 4 1.5 DR -~ - -

• ~ 1.5 -I- - -CL- SANDY CLAY: greenish

1orange- -I-

: ... -~ CH brown With dark brown; wet; - AD - -I- firm to stiff; moderately -,_ - -~ - -~ plastic:. - -I- -I- . -I- . -... - -... - -... : -... -• 1::- 30 -: --.-... - -... - -... - -... - -'"" - -- - -... - -'"" - -- -'"" - -• ... SW SAND with fines; light -... trac.e to - 4 --... medium brown; wet! medium dense~ - SP-2 1.5 DR -... - 9 -... - 1.5 ... - 1 /, --... - -t::- SM- SILTY SAND-SANDY SILT: 35 - AD -- --t: ML greenish,gray-brown with orange- - --• -I- brown; wet: dense. - -I- -I- - . -... -'"" - -... - -...... - --... -... - -... - -... - ---...

• - -... - -I- - -... I- - --...... 40 -: -... I- - --I- -... - -- - --- - -- -•

•

-'= - D~U ffil Tiii~ lJJG A1111. M ~Pl'lt\'1~11111• -- ?IQ~ L"lr flit GlDLQ!;IC Mii S!~JL<;Ull• -- 650 1.0 p h(! ~(JlltlUJOW~ DKAO~t ?IG l>mlR• -- - S-6 ~?l(ljl "~~ 1)1lTAlW1D fMl!l'I !~!RUT, -- - psi 2.5 D!5COl'11MIJ()l.Tt. <!ID 1'!.'~~!Bl1 Ill~- -I- : ~llD SAlll'Ll~Q ia~·:HSLTAHD H -... "" " ~1111.LL-D11.111.n~ 111)!,J..<I • -... - l!OTAll1 Al!D w~SH -J~~ KUL.f.11 llAW: -I- CL SILTY, SANDY CLAY with gravelly - ~~· c~nlCritrn~~ " tM1A -- RtC.UO llCAU~E ~f 1111. !IUD !1J I'~~ - sand inclusions; orange-brown ORllLLNG HULb ..,mli'IR CA.!ilNll 1~ -- l.!LWJK:lNG llUllll. -.... - -~ with greenish., gray- brown; vel:"y ,5 - AD "PHIA i..>i:: lHl!!<:ATf.~ <"i\lm!TIC•r. t• .

~ - T~U ~m..1 OllLI u~ M [)AT[ IM~I- -~ moist to wet; very stiff c:aliche. - ~ .. TF.11 .'Jill KAY 11'.lT 11.HA.'~lllT co~11(- -~ - Tl()NS. AT OT1WI l;~'.•T1ilNS .'JI~ u!I ~ - ~nn::I DATl:S. .vrl ~I.TU Lt:~![.;9 -~ - Sfl\"lllll d.~ S.l!Llll"f "f(J v.u.u;rwll. --I- - nil~ !!(IL.Ii W~ll ~ \~ $~!(.111 A '11111 -... - 11.3 ru HIJYIOI rilLTA r~LWlLY ,...,. -~ - OHIGll 1'1!11.1"1!~U Allll 11!.Tt "°q~- -- ~d.ILI Jrll Til1 l'i.1'~H Ill ~H-~ - (lf1C C(lllTUl:l'lll.~. -~ -

• ~ - Tld. 8"-'itlPl~iT!Dll LITIU '""' O~rnl -~ - 111Tll¥1W1 Mi~nllllT °'~ ~"P~Oll• -I- - ~!I 1111."ll!IMILli ll.U'lll.U ""'ltRIAL -... - TI'"U, ...,n TMI. rMJl~ITIClllS M1 N -~ - ........ -.... - 50lL ~l.AllJ!~IC~ll!IH 111'.1"!1 il!I l,llGI " BORING TERMINATED AT 50.0 ft. -I- - AU 1111.D t~$1'1U.TIOfl1 i;o~O 1111 -~ na: LlltJLDI ?1'.1((..1. CIAJ11'1~~?1L"lll -... • - SH!I~ .

0

• '~\Wahler SPRR PROPERTY EXPLORATION SORING LOG eCRING NO. HACIENDA BUSiNESS PARK ~1101~:f

,,_ I $.~Elf 110.

Assodctes nnr-.LU~A I 2 or 2 DH-38

• BOR !NO LOCATION See Site Map (Ffaure I-3) ORO UNO Eq29, 0' Annr OEPTH,ELEV. WA !ER 11.0 ft. I DRILL CONTRACTOR H.E.W. Drilling TOTAL DEPTH 29, 5 ft. DRILL RIG CME 75 IBDRINGOIA. 6 inch I DA TE DR I LLEO 7-27-81 LOGGED BY W, D, p,

• SOIL

DESCRIPTION DEPTll SAMPLE ~ REC. MOOE REMAR~S CLASS. ND . 0

I:' CL SILTY CLAY: dark brown; damp to 0- AD -- . L.. moist with depth; stiff. -.... - 100 -.... - psi 2.5 p : L.. - S-1 L.. . -

• L.. - 2.5 -L.. - 300 -.... - -!::' - psi -. -L... -L.. . 2.5 -.... - p . .... .

2.5 -L... . S-2 . L... . . '- . 650 . L... . .

• s- psi· . .... - . .... CL- SILTY CLAY: brown with orange- . . L... . . '- CH brown; moi$t, stiff; slightly . AD . L... . . .....

plastic. . -.... . . .... - I -.... - . ..... - ' -:: '- -• '- . -I- - . .... - -'- - -'- - -'- . -'- . -L. . -10- -:: .... -

• L.. - -L.. CH CLAY with silty and trace sand; - -L.. -L.. greenish-brown with orange- .

100 -L.. - 2.5 p Water first encounter~ L.. brown; very moist; stiff to -L. - S-3 psi 2.5 at 11.0 feet. -- very stiff, - -- - .500 -- - -L.. - psi -L.. - -L.. -- - AD -- - -• L.. - -L.. - -L.. - -L... 15-: -L.. -.... - -L.. - -.... - -L. . -.... - -- - -L.. - -• L.. - -L... - -.... - -i- - -.... -.... - -.... - . -,_ - . .... - . ,_ - . . L. -

• -..... 20 . .... - . .... - . .... - S-4 2.5 p . i- - -'- - 2.5 -~ - . I- - . '- - . '- -,__ -. '- - AD . '- -• . L. - . ~ - . '- - -- -~

SILTY SAND; greenish-brown with - -.... SM- - -L... orangc~brown; med: dense; - -'--ML wet. 25-

• '~\Wchler SPRR PROPERTY EXPLORU IO~ SORI~G LOG eCRl~G NO. HACIENDA BUSINESS PARK ,. g:)' i.: t "'0. I $111 ( t: ' '" DH-39

Assccia~es . HBP-109A I 1 "' 2

•

•

•

•

•

•

•

•

•

•

•

BORING LOCaTION See Site Ma ure I-3 C.OU'10 EL329. 0 A r DEPTH;ELEV. WATER 11.0 ft. ORILL CONTRICJOR H.E.W. Drilling TOTAL OEPTH29. 5 ft DRILL RIG CME 75 SOR I rl!'.i 0 11.

SOIL cuss.

SM-ML

DESCRIPTION

SILTY SAND: (Cont'd)

- increasing silt.

BORING TERMINATED at 29.S ft • ..

DATA CJ11 ~1~ l.nG AILI I.II AftR\"JKltlATT!lll IJY t1rB CZUWCL~ .\~II ~1:11suu...a \nNDITHl~-~ ll[l:llU)ti Tiii: Jhl'<.!t<WoTli'lll ~ DRTAlll~U fRI .. P!llllUL"T,

lll~COllTL~l.l'>I.~. A.fi) l'<JSSlllll llJ~l\·~~l;I ~/JI• t«M" h~<:~•~•IA1i.D &r '"'" <ir S""'1.L·Dlu<l'.T<• "''rs~. OOTllJIY Al'U .. ~~M l(lllMG lll.ILU H•llK H,i,?~R 1:1lf'trll!:ATIU~~ l~ fMtS RlGIJID nLAl<!I~ uf TMl llllll ni u~~ 1•~11.l.lllG FLUID >.!<~/<Ill Gcilll<'"• Ill AD~M~l~G ll'!Li~·

ftl\~ 1.f1G IllDLCATH t•!Pl'TlfTICIH Ill Till5 ~!I.~ :, <.!~LY clN Til1 llA!l i•O!(AUD I.ND 'VII •<)~

n:f'~~El'I <:CllD!TllJH~ AT 1.•!llJ:W 1.£1U.Tl!.\115 .t.111,'1 Oii •!Tttl.~ MTU. AJIT 'o'AU~ 1-'l'US SllOWll Mi S~a.J~l:f tQ VIJll!LTICll

Tll5 11(\1..f: \IA~ !.ill".f.rn LW ~~~11 ~ o,;u "5 1'J l'llO\'IDE ~At• ~~TNARll.Y rc»i [111;8MM F1..'11!'05U >.ilD 11'.!T ~~.(~-~~~11.Y mR tHi l'\,ll.i'('l$tl ar s~t­c1ric Cl\~tl'.!o(TLlll~

1'111' ~TIUTlrlCAfl()ft Ll~~-()1! DEl"Tlt !~tUVAI.~ IU.F"llf~~IIT Tiil Af~~~~l""~ ~!.'ll!llJllU ~tM.r.M ""Tr~IAL nrn, AllU tltl T'lllJl5\T!oJ~5 MT 91: ~)AL

50lL ~1.J1~~1r1~Anan sll'..IW!I •!~ {J"ll'JI AU: r1u.b CtA55ll'Ll:Jlflll~~ ILA~~D \JN tt!E ~~lf[~D ~OILS (l.A~~lrL<"ATL,,~ ~vHrN

inch

DEPTll

25

30

35

40

45

50

'~\. Wct".!er Asscc::::~zs

SPRR PROPERTY HACIENDA BUSINESS PARK

OA TE DRILLED LOGGED BY

SA\IPLE PR REC. MODE REMARKS: NO. ROD

AD S-5

SP-1 6 1.5 DR 8 1.5

.,

l't~1!:T ,.J, ~"![[f .,;i_

llB - 2 ., 2 DH-39

• BORING LOC>! I ON See Site Map (Figure I-3) GR OUM EL. 342 -0. Ann-~ OEPJH,ELEV. •ITER Not encountered I OR I LL t::ONTRACTOR H.E.W. Drill in" TOTAL DEPTH 17 <; H

DRILL RIG CME 75 f BORING a IA. 6 inch I DATE DRILLED . 7~28-oBl LIJGGEO B't T.T " ?

• SOIL

OESCRIPJION OEPTll SAMPLE %1 MOOE RE"'RKS GLASS . NO.

REC. 0

- D-: AD -- CL SANDY CLAY: light brown; soft; -- -- low plasticity. FILL. - 100 -- - p -- - S-1 psi 2.5 -- - -

• - - 2.5 ' -'- _,

200 -'- - -'- SM SILTY SAND: light brown; dry to - psi -'- - -'- damp; loose. FILL, -'- - -'- - 300 2.5 p -'- - S-2 -'- - psi 2.5 -L.. - -t: - -- -• '-- 5-: -'-

' -'- CH CLAY: dark brown with orange- -L.. - -L.. brown; moist; stiff. - AD -L.. very c -L.. - -L.. - -L.. - : L.. -'- - -L.. - -• L - -L.. - -L.. -L.. - -L.. - -L - -L - = t:.. -

10 _ -.... 300 -L - -

• L - psi : L - S-3 2.5 p L - -L - 500 2.5 -L.. - -L - psi -.... - -'-- -: L -L. - AD -L. - : L. -.... - -L. - -• L.. - -L.. - -L.. - -'-- 15-:: -L -L.. - -L.. - -L - -'- - ---L.. - -'- - -• '- CH CLAY: gray with orange-brown; - -'- -.... moist to very moist; firm • - -L.. - -'- - 240 p -.... - S-4 2.3 '- - psi -L.. - 2.5 -L. - -L. - -L - -

• ,_ -~ 20 - --,_ - AD ~ - -'-- --L.. - -L ML SANDY SILT: greenish-brown; - -~ - -~ very moist loose - -to wet: to -,_ - -~

medium dense. -: -~ ,_ - -• -L. - -L. - -~ -

~ - -L. - -'-- - -' • --'- 25- -

• '" SPRR PROPERTY EXPLCHTIO~ 90•l~G LOG :C!ltS• S~. ,.\ wcr.!er HACIENDA BUSINESS PARK P •~I [:: f "':I. I S.~ [I; T ~ :J •

Asscci:;t·2s HBP-109A l 1 •• 2 DH-40

• SORING LOC1TION See Site Mao IFiourc I-3) OROUtlO El,142. n '--~, OEPTH,ELEV. WAHR Not encountered I OR I LL CONTRAC!OR H.E.W. Drilling TO!>L OEPTH27, 5 ft. ORILL RIO CME 75 1 BORING 0 II. I DA TE DRILLED 7,-28-81 LOGGED eiw.D.P.

• SOIL

OESCRIPTION OEPTll SAMPLE % REC. MOOE REMAR~S CLASS. NO . D

- 25 -- - -- CL- SILTY CLAY: greenish-brown with - -- - 300 2.4 p Free water in S-5. -- CH or·ange-brown: wet; firm to stiff. - S-5 -: - psi 2,5 No standing water in -- -

• - - boring after 'drilling.: - -- - -L. - -- BORING TERMINATED at 27.5 ft. - -- - -- - -- - -- - -- - -'- - -c. - -

• '- 30-: -L -L. - - -L. - -L.. - -L. ~ -L.. - -c. - -'- - -L - -L... -: • -L -

• '- - . -L.. - -L.. - -'- - -'- - -'- - -'- - -'- - -L... 35 -:: -L.. -l.. - -l.. . -L.. - -• L.. : -L.. -l.. - -... - -L.. - -L... - -L - -... . -... - -L.. - -L.. - -L - -• -L - -L - -L

40..: 1..- -'- - -L.. - -L.. - -L - -L. - -L... - -L... - -L.. - -• L.. - -'- - -L.. - -L.. - -L.. - -L.. - -L.. - --L - -L. bllT• l'lill TlllS UlG llJI~ N' A~PIR1KlllllTL~ (IF Tl\i -

• L. <;t;<Jl,<.C.lf. AllD 5UllSl.VA1., <"~MOITJQM5 6t~AV11f. - -'-

nlil IMf'i>ll..:A?lOll \l.U n~r~lrl~D l'Rat L.•U!Mb~t. - -'-

Ol~<J~ll~ul\ll5, l.llU l"J~~lt~Y Dl5TIJHW ~M-

45 -:: -rLL~~ ~t.(€~~ITATU1 11 u~e (If 511A.LL-Ull.tlli:~ -L.. ~~. ,1rfAiY ANll 4.l~N 111.!iiJ~f. Hfll.J:S llAVI -L FUii.THU ~'>r"~L[{ATl<"rll~ IN THI~ H~MRD AHAU~l -L or ntt: ~tt~ ,.,., 115l DN!LLLH~ Hll!D A~!l/OR - -L (".A.Siii(; IN /,l)O>.IM:JU, M1llJ:S - "' -,_ - -~1~ !«. !NOICAtn (~Ma!Th"lllS I~ nus 111">1~ . '- \!~tY "' TU l!Ht l~D!o."A.Trn A1111 Mi "'" - . '- lli'l'l~(IR 1'<)llCITl~I At "!MU 1.0CATL\!11~ .IJltl - . L.. IHI Q'IKl~ flAf':~. AH "AIUI. l,l\'1:1.:1 S*- AM£ -L SIJLl[CT 1\1 ¥¥!•THlll - .

• -'- Tllll llCIL[ w..ij J;IC,(.l:D Ill svcll .. loAY A~ TD - -L PtiWl!ll: OATA !'1(!'1.1~11.Y rnt Uf.SjY, Pl"ll":L'll.~ - -'- A11D lkJT lll:~ls,,.,,;1LY ;(Ill TU r~t'l!~U ii# ~1'1- - -,_ cine r.arTIW."T\11!3 . - -L - -L Tiii: ~fll:•T!rrr..tnllll u~t~ (·~ !)l'.1"1"111 111ru:vAl.3 - -L 1!11"-l:!!l!!l'f fMll A~l'llOX!'IAR 11')1.J~JIU![S 1[11oltU -llATUll'J. fYH,:11, .um TIIL ~~lll!'JllS IUll .._ - -,_ ... ~. -,_ - -L 5llll ~LAl>llUl(•Tl,._ V'Jlllll '"' lo'lal 11111: nno - -L... CU.SSlrlU.TlC)ll~ ll.A:lll.D (]II n111: ~'111/rl[D SOILS 50 -Cl.J.55/FICATLC)ll St~T'llll.

• ,,y w hi SPRR PROPERTY EXPLCH T 18~ 90R ISG LOG W!ISG S3.

A c ... er HACIENDA BUSINESS PARK ft•)1(:r ''· I ~" l l r ''· Assc::iotzs HBP-109A I 2 •• 2 DH-40

• BORING LOCHION See Site Map (Figure I-3) CROUim El. 337, Q Appr OEPTH,ELEV. \Ill TER Not encountered I OR I LL CONTRAOTOR H.E.W. Drilling TOTAL DEPTH 26.5 ft ORILL RIG CME 75 J eoR 11<G DIA. 6 inch jOATF; DRILL.E'.D 7/28 81 LOGGED BY W.D.P.

• SOIL OEPTll SAMPLE /Ca REC. MOOE

CLASS. OESCOIPTION NO. RE~ARiS

D

>--ML - SANDY SILT: light brown; dry to o-- AD --- damp; loose. - -- - -- - -- - -- - -- - ' .. • - - -- - -- - -- - -- -- - so p -- - -

• - - psi 2.5 -- S-1 -- - 2.5 -: CL- SILTY CLAY: dark brown to black;' - -- 100 -:- CH moist; very soft to soft. 5- -- nsi -- • -- - -- : -- -- - -- - -- - AD -- - -- - -- - -• - -- - --CH CLAY: dark gray-brown with -- - -- orange-brown and light gray; - -- - -- very moist, stiff. Trace-of - -- - -- sand in cuttings near 10. 0 feet. 10- -- - -- - --- -• - -- - -- - S-2 100 p -- - -- - psi 2.0 -- - --- - 2.5 -- - 300 -- - -- - no< -- -

• - - -... - AD -- -- -- - -- tS...: - -- - -- - -... - -- - -- - -- - -- - -• - - -- - -- - -- - -- - -- -- - -- - --

• - 7 l. 5 -- - DR - - -

- 2~ SP-1 12 l. 5 --- 16 -- - --- - -- - AD -- - -

- CH CLAY: gr<>enish-brown wit_h - -- - -

• - orange-brown and dark orange- -- - 6

-- brown; very moist; stiff to - SP-2 1. 5 DR -- - 8 -- very stiff. Sand inclusions, - 1. 5 -- - 12 ' -

light bro1Nn; fine -- to c.oarse. -- -- - AD -- - --- - -->-- 2S.: -

• 'v SPRR PROPERTY EXPLCfiU IO~ S Of! I~ G lOC eCRISG so. A\ Wot':ler

Asscciotes HACIENDA BUSINESS PARK "'ll£:f "I:), I SM I ( r . '. HBP-109A I l .. 2 DH-41

•

•

•

•

•

•

•

•

•

•

•

SOR I MG COCA! ION See Site Map (Fiugre I-3} encountered DR I LL CONTRACTOR H.E.W. Drilling

ORIU RIG CME 75 6CRltlG DIA. 6 in~h SOIL

cuss. DESCilPTIOM

SILTY SAND-SANDY SILT" with tlepth: brown; very moist to wet; medium dense.

SILTY CLAY: greenish-brown, dark orange-brown; very moist to wet; stiff'. Moderately plastic.

BORING TERMINATED AT 26.5 feet •

DAh '* Tllr~ !.ilii <Ill: .tJI ILl'l"!IOXtMTI"" <Jr t1it !i&ll~I~ L'III ~l!k>lllUM.ll OOWlTI~ llt:l:Mllll T1ll( 1n·1~tr ... ~ ~~TAlllUI '111»1 INDIUCT, DJOC•,.....l•l• ............. 1) k>.<~IU¥ Dl~TI."llUI> .........

rLIM~ ~E\'•~~lhti.JI ~1 \:~~ <l, S/IALL-DlfJll:TU. llllL.IU. ~TAllT loJID w.x~ ll"lllNG ~IJ:S llAIJ:I nml?l:I Cl.m'Llc.!Tl~ IN Tlll~ l~.:..ltll U:C.AIJSll OI' Tiii: M~ TI> \;?;I l!l!lt~ll'll fl.l,llD A.o!l/1:11. CA.llllfoli l' AllVAIKJl!li 111.11.H-.

1'111~ LDG LllDICAn5 t':IP:l'ITll.lri lM 1"11" llilLI OML1 !)II Tiii: D.l!ll IMDICA'!UI ~~l) .... t lli"rf U:PllL~lllT CDIAllT!DllS AT •mill l.'11.:At!i""~ ~..m i'ljl 11Tlll:I lllLnJ;. IJjT WATU LIY1U 5lllJWll A~I !Wt.ll.:i' m 11A,il•?T"111.

tftl'j: 11(11 .. """" \J'll:.i.&:B Ill ~llCll A ritAr !.!! 'Ill i'~Y~[~ flo.l~ l'tl!M.111.f f\":t IMUHill l'l!lll"Jl!l.5 AJIO ~\"f !lliC.1-SJl..d:!!.f f()ll Tiii. ?W.l'OSU Yf 51'1.­CJIJ~ (IJ!ftMCfl$!1

Tiii. STIV.Tll!CATI\• ~\~ ca !ll."11 nrn:IYALS HJ1tUillT T1fl: Al'l"ll'Jllllllll [il}<'llllili!3 ~1\11:.lll

!\ATUIAL TYPlll, AllD Tlllo TlWl~lfl( ... ~ Ml 911 ........ S/lll Cl.A51l11UTI0:.5 ~ i1li !iW':ll! .IJll HU~ (.!,._.i;UTTUTIOlll ~lfl <)II l>dl •~\flt~ !11111.& (~.UTTCATl(llj 5TI'T'1'"

DEPTll

'" .\ \\'cr.!er SPRR PROPERTY

HACIE::DA BUSINESS PAR!: Associct2s

DATE DRILLED 7/28/81 SA•PLE PR

REC. MODE NO. RUD

SP-3 6 1.5 DR 8 1. 5

12

HB -109A

GROUtiO H,337. 0 Appr TOTH oEPrn 26.5 ft

LOOGED Bl W.D.P.

DH-41

• 6aRING LOCAllON See Site Map (Figur" I-3) GAO"'m <L. 334.S'appr DEPJH,(LEV. IAHR Not Encountered I DR I LL CONTRACTOR H.E.W. Drilling TOTAL OEPTH 28.0 ft.

DRILL RIG CMI' 7 'i IBORINC O IA. h ,_ ·h I OAT< DRILLED 7 28/81 LOCiGEO BY <.m"P

• SOIL OEPTll SAMPLE XI REC. MOO< REMARKS

CLASS . DESCRIPTION

NO. D

- o- AD -- CL SANDY, SILTY CLAY: brown; dry to - -- -- damp; soft. - 100 p -- - -- - S-1 psi 2.5 -- -

• - - 2.5 ' -- CL- SILTY CLAY: dark brown; damp to - 200 -- - --CH moist; vety stiff; moderately - psi -- - -- plastic. -- - -- - -- - AD -- - -- - -- - -- - -

• - 5 -:: -- .. -- ' - -- - -- - -- - -- - -- - -- - -- - -- - -

• : CH CLAY: greenish.gray-brown and - --- orange-brown with dark brown; - 100 -- - p -- moist;\ very stiff. - -- - S-2 psi 2.5 --- -- - 2.5 -- 10 .::_ 350 -- -- - psi ---- - --• - -- - --- -- - AD -- - -- - -- - -- - --- -- - --- - -- - -• - -- - -- - --- -- 15- -- - pockets of sandy clay; and - --- -- clayey sand. - --- - -- -- - wet; soft. - --- - --• - - 700 p -- - -- - psi 2.5 -- - -- - S-3 2.5 --- - -- - 450 -- - -- - "'.::; -- -- -

• - 20- AD --- - -- - -- - -· -- - -- - -- - -- - -- - -- - -- - -- - -- - -• ,... - -,... - -- - -- - -,... - -,... - -- • -- 25- -

• '~\Wch!er EXPLCHTIOH BO• ING LOG ~C?.ISG so. SPRR PROPERTY

HACIENDA BUSINESS PARK II") I E : T ., J. I S Ill [ [ T .,_ Assccic~2s HBP-109A I 1 .. 2 DH-42

• BORING LOCITION See Site Map (Figure I-3) cnou:io EL,334.S'appr O(PTN, ELEV. \Ill TER: Not Encountered I OR I LL CONTRACTOR H.E.W. Drilling TOTAL DEPIH28.0 ft. DRILL RIG CME 75 i eoR ING OIA. 6 inch I OA TE OR I LlEO 7/28 81 LOG GEO Bl tll'\P

• SOIL DESCRIPTION OEPTll SAMPLE IX REC. MOOE RE.!r\ARPiS CLASS. NO. 0

>-- CH CLAY (cont,) 25- AD -- - -- -- - 100 -- - S-4 -- - psi 0.0 p -- - -

• - - 2.5 ' -- - -- - 600 -- - -- - , __ , -- - -- - -- Boring terminated at - 28.0 ft. - -- -- - -- - -- - -• - 3o- -- - ' -- ., - -- - . - - -- '- -- - -- - : - -- -- - ' -I- - -• f- - -f- - -f- - -I- - -I- - -I- - -I- - -I- - ->- 35 -: -f- --- - -- -• - - -.... - : - -I- - -I- - -f- - ->-- - -I- - -I- - -I- - -f- - -f- - --• I- -I- - --- - -- - -- 40 -: - --- -- - --- -- - -f- - -f- - -

• f- - -f- - -f- - -f- - -f- - -h - -- - ~ - - -- - -

• - nl.T' "!I TlllS IN. I.A[ ~N A~l'll\'lXHl!ITlll~ <'•f THI: -- ~[l!Lllj;IC ;.im ~'''"W~YACI 1:•)"1llTln~~ ~tCA\l~l - -

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• T1115 HOU: "1111 WG<;f:D TW ~1.1\:1 A \/AT !&. f<.1 -- -- rll\l'llrit: r"ln l'llfWlll.T f'<~ DUlr.M r.i'RP<°T'J1'5 - -

- AllD flll)T ~~n~~AlllU rclR 1~1 fll~N~r~ II~ ~fK- - -cine ,.,,.til.A<.:11..'lt!. -- -- T1l'1I: •Tv.ATITl(.AT!<"IH l!•ts !"Ill! llH'l'll \~'TT.MVALS - --- Rr,>11ntl!T nl1: A~~IW•l!.L'IATK lloNIMl\A,iein K'l'l'l!U - -- .,..1.t•IU TTr-t:~ .... ~; nuL 'TT<.<M)lrl1lM5 !\AT H - -

IOllALlllAI.. -- -- '°LL CI.M;~IFTl'nl\11115 st:Mii '"' l.()o;S dl fltl.11 - -- CL.AS~lfU.•l!•>111 M~ID '"* ?>u:: OM!f!Fllo ".\l,>LL.ll so- -

CL.AS51r!CATl1"' 1Y1TT.ll

• '~\ wcr.!er EXPLCHTIC~ 90"1~G LOG :CR IS!i N~.

SPRR PROPERTY

Ass::cict2s HACIENDA BUSINESS PARK ii' I JI f : T .. ~ . I S111 l ( f ''.

HBP-109A I 2 " 2 DH-4?

• BORING LOCAllON See Site Map (Fizure I-3) ooou:10 Ec. 321,.o a--J DEPTH1£LEV. WATER 5.5 ft. I DRILL CONTRACTOR H.E.W. Drilling TOTAL DEPTH 41. 5 ft-DRILL RIG CME 75 i soR ltiG DIA. ~ -nh jDATE DRILLED 71 n/01 LOGGED Bl WDP

• SOIL

OEPTll SA\IPLE ~ AEt::. MODE REMAR!S CLASS . DESCRIPTION NO. 0

- 0 - -: CL SILTY CLAY: dark brown to black; - AD

. - -- dry to damp; soft. - -'- -- - 50 p -- -

• - - psi 2.4 ' -'- CH CLAY: greenish-brown and - -'- orange- - 2.5

-'-- brown; moist; soft to firm. - S-1 120 -'- - -'- - -'- - psi --

• '- CL SILTY CLAY: brown; firm - 100 -'- wet; to - psi p -... stiff; with trace of - 2.3 -... a sand. - S-2 300 -... - 2.5 -..... 5- psi -... - Water first -... - 50 encaun- -'- - - ~.; tered at 5.5 ft. -'- -L.,, . -~ -- -

• '- - AD . '- CH CLAY: dark brown; moist; firm - . '- - .:. t:- -- increasing plasticity. -.... - -.... - -,_ - pockets of clayey sand snd - -,_ -L sandy clay. - -,_ - -,_ - -.... - -,__

10-: -.... -'- - -- - -

• - - -- - -- - -- - -- - -- - -- - -- - -- - -- - --- - -- - -• - - -- - -- MR SANDY, · CLAYEY SILT: greenish- - -- 15 - -- browi1 with orange-brown; wett -- - 100 p -- firm. -- - -- - S-3 psi 0.0 -- - 2.5 -- - -

• - - 350 -- -- - -si -.... -:: - - AD --'- - 5 : - -'- - SP-1 5 1. 5 DR -'- -

"' I <" -- -....

• -L SM SILTY SAND: broi;\711; wet; medium 20--= -~

dense. -~ - AD -~ -~ - -.. ~ - -.... - --~ - -~ - -~ - . .... - -~ - -~ -,_ .

• -- 3 1.5 DR -.... - -~ MR CLAYEY, SANDY SILT: greenish- - SP-2 /,. 1. 5 -~ -brown with dark brown; firm 8 -h wet; - -.... ~ to stiff. ' 25 _: -I- AD -

• '~~ Wcr:ler EXPlG'lUl8N 90'l ING LOG ;SRISG s~.

SPRR PROPERTY I l'.)J(Cf 111Q. S.M ( ( f •O. ' As.sc:cictes HACIENDA BUSINESS PARK HBP-109A I 1 •• 2 DH-43

• SORING LOCAi I OH s "" Site Man fFinure 1-3) C~OUNO EL.324.0 -212~ DEPTK,fLEV. JHER 5.5 ft. JORILL CONTRACTOR H.E.W. Drill in~ TD! AL DEPTH 28. () f~

DR ILL RIC CME 75 I SOR I llG 0 IA, 6 inch I DATE OR "LEa 7 28/81 LOCGEO BY 1,mp

• SOIL O(SCa I Pl I ON OEPTll SAMPLE %;] REC. MOOE REMAR!!;S

CLASS. NO. 0

::Mil CLAYEY, SANDY SILT; (Cont'd) 25: AD --- - -- - -- - -- - -- - -- - ' -• - - -- - -- - -: - -- - : - -'- - -'- - -'- - . -L. - -'- : -h- -• '- 3u. -'- 100 -'- - • -L.. • - S-4 psi 0.0 p : L.. -L.. ' 2.5 -'- - -L. - 400 -L.. - -L. - ~o.i -'- -L. - -• - -. h- - AD -h- - -t: CH CLAY: greenish_ brown with orange - : L brown· and dark brown; wet; firm - 100 -... - -'- to stiff. - S-5 psi 0.0

p -'- 35- -: '- - 2.5 -L.. -

• L.. - 450 -L.. - -L.. - insi -L.. . L.. - -h- - -'- - AD -- -

• L.. - ->-.CL- GRAVELLY, SANDY CLAY: greenish- - -~CH - -brown and orange-brown; wet; - -L.. - -L.. stiff. - -L.. - -L.. - -L.. - -'- 40 - -L Variable areas of sandy clay- 8 1.5 -'- - -'- clayey sand and silty elay. - 9 1. 5 DR -L. - SP-3 -L - 14 -

'- - -• h - -

L BORING TERMINATED AT 41.5 FT. - -L- - -'- - -... - -'- : -L : '- - -L.. - -'- [>AU OH 77115 LIJG I.I(~ AJI •~PRi'IU~TIClll or Tl'.f! -L. ~f.i'll.i'IGJC AllCI ~LB~UIU'AL[ \<.•i>1Tl()M~ A[CAL'51t --

• -L T>it tl!Ti'l~llJl.TIOM ~A5 ~~Hl~tu tRclR l'!ll!HCT, -

'-D(~rHT!lll!llll~, A~tl l'Q~~l~Ll Ol~!IJRR[tl ~!Vt·

45-:: -HfHG NiC[~~l!ATlD &I ·~~ •!r ~~LL-h!l.lfl..Tll -'- HnU:& RLlTARY A>tl W"'°H Jl.!HIH\; 'l'•L~~ H~VI: -'- f~HlliE~ <'.<' .. ~l.l<".ATIQNS IN IHLS UOIJW ~(.<"All~[ - -..... O)f T\<'I: ~u.n rn 15[ DRLLLLM.; 11.<.10 Ajffi/()R - ., -'- <.:A~lll<", IX AD\"AMCIN~ NQU:5. -'- - -

L.. TH!~ w(: lrll'llCAH~ cmmLT!(IN5 !M rH(S ~(Jl,li - -DNLY ·"' T'<'F: D•Tr l'o/lllCAH.D A.~U M1 ~,·,y -'- Rt~ll.tn~'t '-"~~1111'•~ AT L"ITl!RR LOC!LT!•)~~·~/i~ - -'- ~N QTHIR ~ rE~ •~V ~/,TfR l.~'il.LS ~*!WI A.Ill:. - .

L.. ~!.11.!ICT 'ro V>.Jll!LT J<.1~. - -L- -

• .

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L'.l.A.ISITICATIQM ,UTI:~

• 'v EXPLCHTIC~ eo."sG LOG 2:~ ISG SO. .\ wcr.!er SPRR PROPERTY I HACIENDA BUSINESS PARK ~•j1f:T ''· $11 f;' ' ". Ass.::dotes HBP-109A I 2 .. 2 DH-43

• UH IFlED SO IL CLASS Fl CHI OM SYSTEM (ASTM 0-24a7) Pill' IU.Ln...- OIVl<IO"' GROUP i;;: I= ,...,I.Jn I 1:1 y "'"'"""' .;:,. .. IJU-

~ z . ~l E.AN GI WELL GR• DEC. GR.li'IELS. G li'.I. YE L-S ilN!I lril I .!:TU ~ES, L I TTL.:: DR NO ., ~

0 . FI NE S • - -~Ril'YELS ~ .. -

• c ~ z w z ( L -~SS i'.1.1 AN PDD~LY GR.llDEJ GRilYEL S "' EiRA'fEL-SJ,ND Ml X!"IJRES. LI T lL :!: " - ~ .. w Gf ~ ~ 0 w z .. z > f I :\IE S) i MO F l NE S . ~ 0 > .. ~ ~ :,.") I- ..... J :-;.

- - ~ .. % c - - !S I L TY c c . ,_ ~., GM GR.Ii 'l'ft S. GR•'l'~l-SAND-S IL T 1111• XTURE. "I IJ.N PLAS Tl~

~ ~ ~ ~ w ~Ail YEL r 1 NE S . ~

c z ~ ~ 0 Iii' I TH --

~ c ~

~ w 0 ~ 0 c .. GC 'CL.Ii'!' E 'f GR • ._.E:L-SAN!i-Ct.l.'f Ml XTURfS. P"L ilS- T I C f I ill E S. z - ~ 0

~ FINES G~il\'ELS,

•

- ~ ., --~- ---.. ~ !:: ~ z . CL EA~ ~ c 0 . ; SW 'fE LL GRADED S1UtDS. GRA 'fE Ll l SU-IDS. t I TTL E DA '° f ! NE S. ~ % > ~ - S llN D S ' .. w

~ z z -

~ z .. -

~ w ( l ES S TH ~11

~ .. ~

., c z .. z w SP POORLY 'ii R il.D EC. Sil.NOS O~ GAil~ELL'f SAii D S . ll TTLE " '" F I hi! S .

% .. ~ - > "5°'1i F 111{ S l .. - w z ., w c - .. % 0 - ~ - !:s ! ·~ ... ., u ~ ~

~ w ., SANDS SM SANDS S•ND-Sit T lill~TURE:S. H-DN-PLAS Tr C r l NE S.

~ ~

c ~ ~ ~ "KI T H

~ 0 c .. !c L A'f E 'f P"L il.S TIC ~ c ~ ~IN~ S SC SAN C•S Slllt:D-CL-"Y Ml XTURfS. FI NE S. u

• I

~ ML I NO AGAN IC S 1 L TS '"' 'iE RY ~ l NE S llNO S. qo Cl!: Fl~ U f:. SH. l'f OR

- ~ c ~- c CLAYEY F I NE S illl:O S " Cl ii. 'f El SILTS- 'fllTH SLIGHT l'LASTI Cl TY.

:: 0 "' - t- V'> lJ": ·.~DRC.ilH IC CL .liY S "' LO'K TO MEJ I Ulll PlilSTI :l TY. GAil"YELLY

' "' 0 ~ >- ~;~z CL ~ - - < CL .fl Y S. S1UHIY Cl. A! S . S I L TY CL l 'f S . Le:• H CL.lil S. - < " ~ ~ - - <

0 ~ - u ~ ~ - % ~ z w ~ OL ORGANIC S: IL TS '" OR~.l.NIC S-1 L TY C-L.llY S er LOl' PLllST1 Cl Tl'. ;; < ~

0 % -w - - I NO A rO.liN I C S l LT S . Iii I (:JiCEO!JS '" :I I ATCI01GEOt:S f I JI E. S .l.NtlY OR z ~

- ~ :: 00 ~ MH S l L T'f S{l I LS . ELASTIC Sll l'S. < c >

~ = - -0

~ % ~ ~ >- .. ""

'-' ~ - - < ::i; ......

z CH i: lfD~GAN ! C CL•~ S C: f 11 ! C.H PLAS!l:ITY. "1 CL ll 'f S. z c ~ 0 - ~ w .. ~

~ ~ - ~ c .. -- ---- --z z ~ - u ~ ~

' - - "' ., - DH :l!o A IJ:il NI C CLAYS Of lilEOIUlll TD "I I G~ PLASTICITY. ORGAN I: S I L TS . ~

~ --• ~

0 H I GH LY ORGANIC SO 1 L S Pl iP ~Ji T '"' D THEA HI C>HLl DRGilNIC S-0 I l S:. ~

DHINITION OF TERMS GRAIN S lztS

U.> SJ!NO!RO SERIES SIEVE .3./4LI 2 OD 50 16 4 3" s" • SILTS & CL!YS DISllN- ~· SAND I GRAVEL I BOULDERS GU- ISHEO lJr.i BAS. l S OF

I I I COBBLES

PL!ST IC I TY F I hi E lll ~ D I UM ' co,1,qs~ ;:- ~NE C C-J. RS E

MOISTURE CONDITION I (I NC REAS I HG WOISJURE )

' DRY Sll GHTL Y DAMP OAMP I MOIST VERY MO IS! IE! {SA JURA lEO) (PL) (LL)

• K E Y SA•PLE NUMBER MOOE RECOVERY PEMHHTIOM RES ISHHCE (PR)

•

SAMPLE CONTAINER: HOLE: RECOVERY RAJIO (RECOROED AS BLOIS/0.5 FOOT)

METHOD OF ADVAHC ING I HO I Cl TED HHOS & GRAVELS BY A FRACI ION: OR I LL I RfUJIVE DENS IJY BLOIS/FOOT'

BAG. . - . - .. - 8 112 - FOOTAGE RECOVERED Fll GHT AUGER. . -- . . - . AD VERY LOttSE 0-4

JAR ........... J m- FOOTAGE SAMPLED 4-1 a BUC!ET AUGER. BA LOOSE SHELBY TUBE. s . - . "

SP I H AUGER ..... _ .. - . so I REMAR!S MEDIU• DENSE 10-30 OR I VE SAMPLER ' DENSE 30-SD RINGS ..... - ... R HOLLDI STEM AUGER .. _ HA l!CLUOES ORILLIHG IN-

F RMAllDH. E.G. IATER VERY DENSE OVER oD ROl!RY DRILL ....... RO l VEl, DAJES. CLAYS & SILTS CABLE TOOL •••••••••• CJ REFUSAL: STOPPED BY CONS I SJEHCY BLDIS/FOOJ• STRENGTH 1

• MAIER IAL TOD HARO FOR VERY SOFT D-2 0-~ SAMPLER EOU I PM ENT. SOFT 2-4 ' '· .-.. -'2

DRIVE. ....... -·, ... , OR TE RM I NAJED : SUFF IC I rnT FIRM 4-8 l;-1

PI lCHfR BARREL •••••• PB I HrnRMA JI ON DBJAINED. SJ lfF 8-15 1-Z

CORE,, •. ••••• 4 •••••• c ABANDONED: SJOPPEO BcCAUSE OF DIFFICULTIES VERY SJ IFF 15-30 1-<

PUSH .•• _ ••• _ •••••••• p Eifu INED ON LOG. HARO OVER 30 DiER 4 • • Number of blo., of 140 pound homm01 hi I i•t 30 i•ehos to dr ivo • 2 i11eti O.D. ( 1-3. 8 inch I. a. )

S.p l it-Bar re- l s !limp i er {lSTM-1 '58-6 s taDda rd pe11·ed r:i t i an t l!l~ l).

"t UneCJn fined co.mp r111 ss i rte st r111 ngth ~ n to.ns/'tq i It. R!IO!ld fr-om a p cc k.111 l p.ane l r(lmB tier.

"i. Wahler I HY FOR

S ~ R PR OPERlY S 0 I L EX PLO RAT I OH LOGS

• Associates HAC IEHOA SUSI HESS P~R~ P A:1l J E C T "'. I FIGURE NO.

KBP-1 09! I I

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• APPEMDIX B

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HOl'YARD ROAD

HEWLETT CANAL

~ -

APPROX IMHE SI TE BOUNDARY

TR EllCH NO. 1

W. A. WAKlEH P LEASAHTOll SUS I HESS PARK

E X P L A N A T I 0 M

"'H-16 TRENCH NO. 2

-

500

APPROXIMATE LOCATION OF DR I LL HOLES

APPROXIMATE LOCATION OF Ex PLDRA l OR y rnrnc HES

APPROXIMATE LDCATIDH OF FAULT TRACES AS llAPPEO DH ALQUIST-PRIOLD SPECIAL STUD JES ZOHE llAP (CDMG, 1974) DUBLIN QUADRANGLE •

SCALE

0 500 FEET ------SOURCE: llltSE PHOTO REDUCED FROM AERo-tlEDDETIC CORPORAT1DN MAP. DATED 6-9-19.

SITE \!AP

& ASS 0 CI A HS .,,mw~:-:i7.ii":7-:7':;";":"":"":~1-;--1-..:.'.::;" ·~' ;.:";..;'i':_::".;..· -+--;-::-::::;;"~'~' =~~..:..· '...'."~" ;;"....::" "'..:.· -I ll'lliLIJ "l TCI • N E'IPllltT E!IEJC:-H • C:ilil F _ CPS-, 01A FEB.RU.A:RY 1981l 11-

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PRO Ji CT NO •

Cl'S-1 It.I.

TRENCH NO. 1 LOG OF SOUTH WALL

I !UTE I I FEBRW.f:~ 1 9BO j

FIGiltllE ll'CI.

A-1

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'f-l-50 I

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~JL T"Y CLAY (Cl.-Cfl); rn•d. qray wtoffJed .,.,,.;.f;, ~ wn; ~fiche 7+75

I

C:J:'J1t.. T'J' CL4"Y (CL-CH}; nr;d. brown -lo l1:qht-9roy; ........ /~~ _J-in~ sand· des-s ,ca-fu!Jn c10cK5; s ligh T ly ~; rocrl- le T- .s .

laye:r 3 differs_ fi-'o,..y;i /Clye.- f'.2._ 6y be; nq li9hier j·n a:>lcir al'?CI O!l,,-rfa;ni~ .....,.:=ire ca{;~ in Cl!"J~'"'° -IO ""-ri-,e­.::b,_.I.{' tt'Jt!:}ff_I~ d a f'pea ranee d la...,.-er- 12. ....

WAHlER ASSOCIAHS

PLEASANTON BUSINESS PAR~

,._to H 11 • 11El'PllRT iUCH • CAt If.

PROHCT IKL

TRENCH NO. 1 LOG OF SOUTH WALL

UTE

FEIRIMIY 1111

6+oD I

FIME llD.

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</+00 I

~fL TY Ct.A Y CL ; t;q~+ bn::nun 10- :Z.0 ~ 'Sand ' °" // h-f_I ob 1,9 ~ it•ide d~ica 7-FOn

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5fl TY CLAY (CL-Cff): . t'ned .gn:Jiy brew.n >f.!1-#J

brown motf!Jf'Jqfi.

::'5 TONE Fl/!'AG)rl~!VT'S ~ concen Trr:o+i~n o rou01cled -ro s,q bn:iu.n:red '5"Q...7ds n::inf!: and che-rt--; ~c:Yne wi--t-h b:::tked "$ur;faces; a~cia--+ed charcoatde+-r~::=.

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:Sll T)' CLA"t (Cl·CJI ): medium To obrl< bo-C'W~ ....::3 • de5-si ca -t-1 on crocK-s "il:J S/fqirfJ';j dQ'7'lp-

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---------~~--------------L ___ · ---== @ - ~1L i_J ~ (i}) ------------ --------------------- --------- @ /

\ ------------- ------------ -------------------- II

.:SILTY Ct AY (CL-CH): ro~I( b~my .,.ri+h gray ond brof:JWf'l ...no fft, nq'$; :;,h9hfly ob.mp; 0Yii011'1s .-:al1che near ba-:;.ail J!-"Or-+ion.

.S:ANOY::5fLT(Ml-5M): light brawri~· Qboui- 35.,; /1,,e sand: -sof f­da"'_P; rocf-:s; pinch~s e:out-- c.i-+ ........ STA fl-rl-30. /Of- 75 51L7YC:LA-Y~<¢L}: ffJO.d_--fo I darKb~n .

·9 ~tLTY CLAY(CL): ~ rle.,w b...-oi.un

YndH-led ,,..,.,#, qro.y and darl<' t>rr:::iwn; ~11gnH'7" eoioth?p; .w kche on lower ~n./-acT.

-------.or~nollr.a!.d layeri"'!} _-c·'j~­/ ~hf and a;.l,cht- ~d

/ ,oi~ out af ......._. ~A IC-1'85..

i l/+00

I

9 ~JL TY CLAY (Cl-Ci-t):

gr-a y brow"; c:bn-rp; :<;fi<:--ky.

CcncRn-fra +i<:YJ oj- -ein_.Jan1c debri~_.. TTJOs-fly grass ..

q

•'f!J ./

.,IL TY C[__A Y (CL ) : ffqh-f­brc":>"Vn Cl rvi-y : abunctor.I' =lich..f. ..

8 ~ft.. TY CLA y Cc L ) ; ye J!oHr brni.-111'1 1?1of-f{l2 r:i w·i---ff1 11-qf}f b.--own; a:,bo, _ _.d-20 :( -=sand or.id .c:ic­cai-::>~ianat fin"" grr::ivel.

12+25 I

~ilfv sand (sMj ien:5;

7~ t low b R'.M"n.

']"'a d.a -fiona / ch~ rige. \\"'

12-t so I ./

5JL TY CLA.-Y (CL-CH): dorK O-Own1 :sh gray; ,,..'2nj -::>f-iff; abundanT caiiche; 1n-f-crnQ/ :=;;/fcKen5Jde5.

layer II Qrad~s ~and;er- w.P--:::: -fQ-ficri.

"'i25

51 l TY c LAY re L ): yellow bre>wn ff!ot+led 111llfh hqhf brclY;/"' and q..-o y; fO- 15~-' -l'-1').e --fa !le'"'Y hne '!3a'°id; -'5on"e ca' ,ch(?.

' STONE F,,l;f' A GMEN TS: : eoncen-tra ·li-:.'»"l cif' ~nded

TI:J ~rAbt:ourlded 9.!"QV'e"/S' Qrd cebblfi!' :s o.f tmrrB ~and5"1-une GY?cl cherl.

i5/L TY C. LAY 1'c t..-Cl-l): da..-A~ brownqray; da~p~· ~+ic-Ky; can-fo1.ns

·'[!) SIL T"t CLA-1 (CL): mod. / To .CJOrk brew-a_:

/ ca:,cl-,e lciyero--,q / cahche. ,/ .0.{"a• base

@

'foyer 10 pncJ--i.:"~ =..f

5JL r-,· CLA'f (CL-Cl-I).' chrK b..-owl"1i-:5h gn::1y~· s+1H: c:ia.mp; ~f-_ick y; in-T-e.-nol '"5-l;cke:Y}s1de:"'.; -s-r:::Jn?e eatiche

12+75 I

·~

focaHy corJ"fQrn5 pa-IC.he~ of .---edcii~ o.--an.ge "SOr;d

WAHlrn ASSOCIAHS

13-/"00 I

PLEASANTON BUSINESS PA K

P~tD ~LTD • HEl'f'Dli:T BU.CH • C~t•f.

PAOJIH NO •

C.,_._10-1.t

TRENCH NO. 1 LOG OF SOUTll WALL

om FElllHIJ.RY I DBI

'2+00 I

L

~IQMI HO.

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@5.ILECtA "I {CL); moden:.rre rown - va l affJOUJ7f-::5

<::' 5and; 'n~~ .:5"anci o:-..c"J.n-f"enT- --fowaro's .base /

:'

/ ~11-T"fCtAY {-:_.L--CH): , mod.. -tc da~k ro

~ILTY CLA)" fcLL =iome "'5Gnd; ,- Ii hi ro bn:::iwn To while·

nbundan t ca fiche; d~~­':"lic..a-t--ion crack'"5. \

/ /U·50

I ca, -foe -t ob~re; 1

lo yer 3a. g.ro ~ ,I

""7'n layer- ,4

/4-r-25 I

1 1q.--r-so / I

15-HJO I

--------------

.:5il TY CLAt (CL) q~dlnJ ro .:'.iA Noy CL/J y --me LA ":i'"'EY

.:S-4 ND CCL- SC) Ot-......., 257A. 1.f-+ZS '51l TL CLAY (CL~Cfl}.· rnedn,1,,.,-.

brown gray; a.ba:.lf t0°' coo~ sand; ':!'.--Tiff;· clomp-~2 ~;;J~!o ~a~7J,.""" ~;; ~ -t:i·:~r7~·

':5i;ghfly ck:r~P-

layer .le qma'.e-5- -fo 5't.¥D2-· SIL"r / ondc.::_A-.-~Y~~

@J

• _......._ 35~~ f;,..,e- -;::,and/ 5ai-::..-ra --_.~fi"cf; o:;;cili-; abuncft:lnT- IO+OO

ac--r~-~~---r::~,--,--,7fil'-----,~---c--c--c-~-c-'-':,--,--,---,-,,--~-~-_,_~~--------,--,--,~-cc----=~~~-~~~:?C"='C'~l,,.,.,,~=-c~~'"'=+:-:-='""~,,...,.,.,..,..,,.,--'='"~'"'=~~~~~..,,,,-=c=-..:.._ _ ~ :-r _ ,: _ -.-- -=---~~___:_---=-~ --T';--_-----____ --r------~---- ___ -~~--___ --~~-"--'-"-••·-.:._ '-- ~-.__.c.•c:C."-'-C:.·C.-'~-:.-cc.jj_--"'"--c:.·--::c·"-"_-,~d.--c.--'-'· --~ "'--'- ---' •:c.-_;_;/_',""-- '--'"-·eoc:·-_:::_.; .. _c·

_....-O?ii<'he a,,..d /1nt!' "'5('.1_..-,c:i

_,/ la-j(!'rJ"ng 'J"l •o/r .Id.

,/

a.ou,,.1ci:'ln-:f <::ic~-_ / ~-:1--jr:"J,,-i C.rcK.A~ . ft:J 6.5~

15+50 10+25 I

tb~SO I

15+.00 I

1s72s 15 -r 75 ' .,_

5~__Jj;-------------+- J____I j_ -=---~~-=-==-=- -~~-- -___ -'fil!_ @) _______ ---------~~ - ------------------------------ ---- - - - - ---- -- ----- ---------------------- ------

@ ---- ---------------

·'ZJ --------- --------- --------- - - -- - -- - ---- - ---~ ::, ------~@l;-______________________________________ _J,_ _________ ____; ___ --;;?;"---~-------------~--+------~~'""~ff~-co:::c:--::::-:;z.=-==--=-=--==:=:-=--:=:~=--~-_2,'-1 15~.1='"'<~~-----------------------------------------------------"~:--------~~---:;,Ll ___ ~,-f"""------------------------t------------"7{__ _______ ~-·~;@:;~----'-----: ~ co,.-;~·-7'( f- no+ h. '5/ ,'_T2~ f":_ I A y Cc L ~ 70 c LA YEY SA NOf-=:.c ): •:='JfLTY CLAY (CL-C.<I): "!;" ci."'5+incf . ...---- I§ · · ~ .3.5~,: snrycf_; iiqh+ 0--o..c.-·n +n rnf1>d1£.fi-TJ -to darKgr0y_:

,YE' Jl-.-::l-1/ b.....-ciwn; -'rio.-n_p_; <:rwrn bly. rio..-n_e. · s+icKy/ very

16-f"5o I

It>-

17+00 I

~..5/l TY CLAy(cL l; rnedf1A..n l -to dar.< gn::i y; Qj/Jche : ."'no~-filnqs .. • d~ '55/CQ -tio...-;

crar:.ol.;.::;,

WAHHR ASSOCIAHS

17-;-SO I

PLEASANTON BUSINESS PARK

P~L!Ji ~LTD 4 llEIPDRT BHCI-: • nL If.

PROJECT ND.

C'Pt-1 f1 l

~f-j ii

TRENCH NO. 1 LOG Of SOUTH WALL

DA.TE

FElli:UUt~ 1tllD

fllil.llf !lllD.

L

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f</+50 I

~n; ....... 35~ :fin.f" sand; so-t-ura-le:d; so f -f; abu ncbnf root~.

·~ '

[) SC-:5#1 . }-t!!fio w brawn; coliche h~rln9i dry.

/9+00 I

,../ / ' I

.51

/'1+25 I

------- @ ---- --=--====---==-----====- ~ -~- ~ : ~ ----=---=---=-- --=-- --===--===--~+ ---i- - - - _:_-,_ - ·0 -=-----=--______, @ \ ' @

~rg;·-==·-· __ ---­@

3/L TY CLAY {CL): ~flow brarvn ro ~r.::;i k brown • ....... 10 .1 CCK:Y5e :Sand; occa:s-:Tk!-na/ -=x;:tndy poc"k'e-f.s

fQ~75

I ll. 20!00

I

{)

---~- ----------+---L \ I -------------·,-+-------------

' I

------------+-----------------@

----------®-

!J i-------------®------------------- ----- 5

20

-----------------/

------------------------ -------!

------------®

NOTES:

t. 5EE Fi GU"1 E5 11-1 /I.ND 11/-2 FOR T~ENCH LOCl>.T\ON

l. TR'ENCH EXGAVATED WITH FOR'D 750 BACKHOE' AND ?>0-1 NCH W\DE BUCKET DUR• NG 'l"'KE Pl' R' I Or;> DE CE MS E R' l ~ oq7q TH R'O LJG 1--\ JANUARY '28, 1'160.

5- LOGGED BY PAUL- C. DENTON AND A\<!TONLO

5- 6UANGAN, GSOLOG•ST5, WAHLER A"550C IATE""-

WAHlfH ASS0£1AHS

PLEASANTON BUSINESS P4K

'P.l.LD ~l TCI • l!Ell'DRT BE•Clt • :£:.1.L I~.!

PIDlECT MD.

CPZ-1t1.t

TRENCH NO. 1 LOO OF SOUTH WALL

11.lTE FISURE Ill.

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NOTES:

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J../)~.ILTYCLAY (CL): ....... 1o:fsand; ;- J?'.le d 1 uf'Y/ brown: SQTurO~; i :::'50 f-f; obunc.bn f rcoTs. / Oi-25 ' I !

\'@.:5JL TY CLA ':I (cL-CH): cJa,.._I(' 9n:iy ···vi'+h dorf< br-own rnof-T//i?gs riear bQ5')".'") =>io]h-f/y da""'.p; ~i-y 3-Tifj · de~si.C-a +io.>? cracl<~; o-/+ernal slicken­':5ide'="; co//ch.e !'nct-T lin9 ~nd •'?Ciu-::s1cr7S r.f ~rd dry c:/0t y o::::o nc..-e t-/c, ri :s n~or ba :se. I T-25

I

1. :>EE FLGUF<ES 11· l AND IV·2 FOR TRENCH l-OC.AT!ON.

Z. TRENCH EXGA VA TED w LT>! FOF?D 750 BACK KO Ee AND 30-INGI-! WLDE BUCKET ON .JANDARY 2'1 TH F?OLJGI-\ 31, I '180.

J. LOGGED BY PA\JL C. DE'NTON, GEOLOGl-S--i;­

WAHLER' A"550C\A>ES-

id:i5IL TY Ct 4Y (CL-CH}: darK r 0~1115'1 gray; daff1-P• / stiff; de-:s~ico "f"IDn

,' cracf<'?/ -ti7~rl coliche 0 +so 11 /a yer-1 ng ,-iear -k:p; I

' ! ' I

~ 5 ame o s @ buf- 'Yt.'l-!h T dfs-fl.-icTiYe

1 whi-fe

/ calichr"'" Ynof;llln9·

'

lei y-er 3 9.racle~ -t-o laye-r 4-

0+75 I

1+75

rSJL-r)' CLA'y (CL- CH): ¥ned/ui-n -fr:; dt::;littk brown· ':'!1-/lgh!'ly damp,• ~.ry ~;/_/; ~-

! :::i:icafiOl'1 crack<:s; /TOO roo-fs. ~

I (l)

2+00

L

WAHlrn ASSOCIAHS

PLEASANTON BUSINESS PARK TRENCH NO. 2

LOG OF SOUTH WAL.L Pffl)J ECT ND. Oil.TE

P~LI) -~L Ta • MEll'DRT BHCH- • C~L If. cts-111~ FEBRLMIY 1180

flWRE NO. .. ,

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• APPENDIX C

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THE UNIVERSITY OF ARIZONA TUC S 0 N, AR l Z 0 N A 85721

DEPARTMENT OF GEOSCIENCES LABORATORY 01' JSC)l'Of'E GEOCHEMISTRY TEL (002) 626-1396

28 August 1981

Mr. Keith D. Brown

Wahler Associates

1023 Corporation Way

P. O. Box 10023 Palo Alto, CA

Mr ,,_ - •H-- / __ "'1 "'r. (?-,.J .. 411) Dear • =own: / ~- _ (' >..1>.< r• (» .,, .... _,.,, ,,._, ' Here are the result~of our carbon isotope analysis on the two

soil samples you submitted on the 12th of August. As is con­

ventional, the 14c dates are normalized to &13c ~ -25/oo

and reported on the 5568 - year half life •

A-2586 Sample S-1 1 trench TS-2, station 0+40,

depth 9.5 ft.

A-2587 Sample S-2 1 Trench TS-3, station 1"'90 1

depth 11.2 ft •

I hope this report is helpful in your study.

7320 ± 610

[i 13c ~ -25.1° /oo

9770 !. 400

J13c - -26.1° /oo

S~l:c-;;-Austin Long

Assoc. Prof of Geosciences

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.. APPENDIX D

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APPENDIX D

HISTORICA.L EARTHQUAKES

Following is a listing of major earthquakes occurring between 1800 and

January 1980 in the San Francisco Bay Are.a that caused damage, had •evere

shaking characteristics, or showed evidence of surface rupture. This list

has bean abstracted mainly from Townley and Allen, 1939; Byerly, 1951;

Tocher, 1959; and Richter, 1958. Intensities are indicated according to

the Modified Mercalli (MM) scale.

Octobe' 11, 1800 - Strong earthquakes for several days in San Juan

Bautista. All buildings were damaged and cracks and fissures appeared

in the ground.

June 10, 1836 - This was one of the largest earthquakes of the region

in historic times. The Hayward fault rupturad from San Pablo to

Mission San Jose and aftershocks were felt for at least one month

after the main event.

June, 182§ - A severe earthquake broke the surface of the ground along

the San Andreas fault zone between San Francisco and Santa Clara.

There was serious damage to the walls of the Presidio of San Francisco

and the Missions of San Francisco, Santa Clara, and San Jose .

November 22, 1852 -. A strong earthquake fractured the ground along

Lake Merced which subsequently drained into the ocean.

July 3, 1861 - This earthquake has a probable Intensity IX, as adobe

houses were damaged and men in the fields <>'ere thrown down by the

shaking of the ground. According to D. Radbruch (1968), this earth­

quake prodnced surface rupture in the San Ramon and Amador valleys,

probably along the Calaveras fault zone. The fissuring of the ground

was accompanied by the emergence of springs, probably on the Calaveras

fault >:one, north of Dublin and west of Camp Parks.

Project HBP-109A D-1

Wahler Associates

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October 8, 1865 - A very large earthquake, apparently centere.d on the

San Andreas fault, occurred in the Santa Cruz Mountains. The intensity

of at least IX is corroborated by the occurrence of ci;acks in the

ground, landslides, and dust clouds. San Francisco suffered great

damage in the filled areas and a fissure appeared in the ground on

Howard Street from Seventh to Ninth Street,s .

October 21, 1868 This was one of the largest historic earthquakes.

Horizontal offset of about 3 feet was observed on the Hayward fault

from Warm Springs to San Leandro, a distance of about 20 miles. The

total ruptured length was about 30 miles. The severity of this earth­

quake is demonstrated by the assigned intensity of X for Ha.yward and

IX for San Francisco, by the wide damage area which extended as fai:

south as Gilroy and Santa Cruz, and because it was felt at places as

far as 175 miles from the origin.

March 30, 1885 - An Intensity VIII eai:thquake on the San Andreas fault

at Mulberry, southeast of Hollister, extensively cracked the soft

river banks at the junction of the Pajaro and San Benito rivers.

April 24, 1890 - This strong earthquake occun:cd at 3:36 a.m. and

produced extensive damage in the Monterey region. Gi;ound fissures

were observed in the San Andreas fault zone near Chittenden, east of

Watsonville.

June 20 ~ 189 7 - The source of this earthquake was the San Andi;eas

fault in San Benito County. It was felt over a wide area and was very

strong in Hollister (Intensity VIIT to IX) and Salinas.

June 11, 1903 - The epicenter of this earthquake was probably on the

Hayward or the Calaveras fault north of San Jose. The intensity <-'as

VIII in San Jose, Haward, Livermore~ and neal':" Niles.

April 18, 1906 - This is probably one of the three greatest histoi:ic

shocks of California. It originated on the San Andreas fault north of

Project HBP-109A D-2 Wahler Associates

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San Francisco and produced a maximum horizontal ground offset of 21

feet near Tomales Bay. Vertical movement apparently did not exceed 3

feet. Ground fissuring along the San Andreas fault zone was observed

from Upper Hattola in l!umbolt County to San Juan in San Benito County.

Extensive damage occurred in the filled areas of San Francisco and in

Santa Rosa and San Jose .

June 1, 1911 - The epicent:er of this Richte:r Magnitude 6.6 (estimated)

earthquake was most likely on the Calaveras fault east of Coyote. The

intensity at Coyote was VIII to IX and VII to VIII at San Jose, Horgan

Hill, and Gilroy.

May 16, 1933 - A Richte• Magnitude 4.5 ea<thquake with HM intensities

of VIII nea• Overacker Station between Niles and Irvington, and VI to

VII at Hayward, Martinez, Mission San Jose, and Walnut Creek.

April 25, 1954 - The epicenter was located on the San Andreas fault at

its intersection with Pajaro River. This earthquake has a Richter

Magnitude of 4.5 plus.

October 23, 1955 - Moderate property damage from a Magnitude 5. 4

earthquake which has an epicenter probably located on the Calaveras

fault between Walnut Creek and Concord, about 7! miles northeast of

Lafayette Dam. St. MaJCy's Dam, near Moraga, was slightly damaged in

that a 1-to 20-inch wide crack extended from the spillway to the right

abutment. The concrete ccre wall near the ce.nter of the dam shifter

1/2 inch downstream.

March 22, 1957 - A Magnitude 5.3 earthquake occurred on the San Andreas

fault near Mussel Rock. No breakage of the surface was observed,

although there were landslides on the steep coastal cliffs near the

epicenter.

January 8-9, 1977 - A series of earthquakes occured in Briones ![ills

including two earthquakes of Magnitude 4. 0 and 4. 3 were felt in the

Project: HBP-109A D-3

Wahler Associates

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San Francisco Bay Ai:ca. Ten other earthquakes ranging from Magnitude

2. 6 to 3. 8 also occurred during this two-day period .

August 6, 1979 - This magnitude 5.7 earthquake was located about 1 km

east of the trace of the Calaveras Fault near Coyote Lake, Santa Clara

County, California .

January 24 and_ll 1980 - Reffered to as the Mt. Diab lo earthquaka

with magnitudes 5.5 and 5.2 respectively (USGS) caused moderate damage

in the Livermore Valley area. Associated ground rupture exhibiting

right lateral movement along the Greenville Fault .

Project HBP-109A D-4

Wahler Associates