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R. Buelon Ro•e, tvf.A. G~oLOQIJj.i
ENG.INE£FUNG GE;OL.OGli;IT
(C ... L!,..QRt..jJ,i., Rca1,.,'1'/lt ... TJQN)
----- 1 I I !
ALLIED GEOPHYSICS
f=>.c'). Bo:ii; 5S3 5AN .JQ$'1:, c;A. QStO~
Mr. Jos Ferreira P. o. i3ox 248 Alviso CA 95002
Dear Mr. Ferreira:
I
I
May 8, 1975
Re: In-depth Geologic/Seismic Study AP 652-10-02
·rt1unK yvu for ti-i€ o~portuni ty site and Its surroundings.
This letter of transmfttal Is bound as Part of the report.
·In summary, the site Is suitable for construction of a single d·.vel I ing horn~. No ea1·thquake fa•;lt trace was found crossing the building site In the normal NW-SE dir~r::tion; eitr.er by geuloqic study, aerial lineation, or selsn1ic refraction ground velocity m~asurements.
A solid foundation, tied with extra stee.I, is the most Important single coristructlon result benefit, from a seismic and geoJogic viewcolnt; since future sharp shaking resultlng frcm reg·ional e~rthquake shaking has a very high probabl I ity, effecting al I construction.
Your site has good natural surface and sub-surface drainaqe.
f~espectf1;I Jy yours,
~~~_.,;:._.:__ '
t A/J-113 "' Edmund t. !lrow11 Jr.,
~1';.\-f! OP CAL1f()D1tAt-THe ReSOURcd .l.GeOCY Rei11111'1i 1 ! ca 11~ ~ ·
OEPAUMQ.II OF CON5el!VATtON -DIVISION OF MINES ANO GEOLOGY · DIVISION HEADQIJARTelS
R'ESOU·MCES BUtLDJNG, li.'OOM t.3-61 1~16 NINTH STstt!!f S-'<:K.o\Mil'lfO, CA -1.t
Dlltrfi& ~ l.OS AHQIUS
---. .... 10.0 107 ScMA. .. ;
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James O. Berkland Engineering G..ol0gy Section County of Santa Clara 1555 Berger Drive San Jose, CA 95112
Dear Jim:
Jur;g
This is to acknowledge receipt of thg 9 geologi~ reports 1 isted on attached page, submitted pursu<1nt to th" Alqu.ist-Prlolo Special Studies Zones Act.
.,:.;. ·~ .. Before the reports can be accepted for pub I i"c file, I. nEW:-d
proper documentation (signature and RG# of the reviewing geologist) that they have been reviewed and approved on bl!lhalf of Santa Cl<;1ra County. Only th" initials of the reviewer appear on the first 8 reports 1 isted and the registration .number is omi-tted •.
A ninth report cannot Priolo reports, becuase It groundw.ioter invesdgation. infonmition. '
b" of aced in ths pub I ic file of Alquistpredates the Act and relates solely to a
We appr_eciate ree ... iving this for our
Please submit the reql.l<!sted written docU1Mntation as soon a" poss i b 1 e so the reports can be f i led as required. A 1 so, p I ease
·note that reports required under the Act should be submitted within 30 days of submission to the county, (see Criterion C of attached Pol ici"s and Criteria). I realize that this may be too short. an interval in some cases, but th" r"ports should bs submitted for our, file as soon as tht1y are approved by you.
Sincerely,
E.W. Hart Encl. cc: State Geologist
.. · ~- . ;.,._,
• ' , Edmund C. 5 rown Jr., '°", S]'A'r! OF CALIFO~NIA-THE RESOUl!CES AGENCY P81 I LG Fl::!; eAI .,. c-.;nof.
DEPAllTMENT OF CONSHVATION ·--DIVISION OF MINES AND GEOLOGY
· DIVISION HEADQUARTERS RlSSOUllCES BUIWING. ROOM 1341 1416 .,_UNTH .snn:Et .sAca.AA41"4TO, CA. 9.!l&l.t
DlmMid O._r 1.0S AMGl!!LU ----.-•w 101 ~ •wcl•c• 51.CIAMIHYO _....,,.. ... ,,,. 1416 Ninth S......
!>OOlt 11'"1"'
·James 0. Berkland Enginee.ring Geology Section County of Santa Clara 1555 Berger Drive San Jose, CA 95112
Dear Jim:
This Is to acknowledge receipt of the 9 geologii:: reports 1 iste<t on attached page, submitted pursuant to th" Alquist-:Pr"lolo Special Studies Zones Act.
Before the reports can be accepted for public file, I need proper documentation (signature and RG# of the reviewing geologist) that they have bee.n reviewed and approved on behalf of Santa Clara County. Only the initials of the reviewer appear on the first 8 ·reports 1.isted and the registr-ation numb"r is omi-tted •.
A ninth report cannot Priolo r"ports, becuase it groundwater investigation. information.
b" olaced in the public file of Alqulstpredates the Act and relates solely to a
We appreciate receiving: thil1 for our
Please submit the requested written documentatlon as soon as possible so the reports can be filed as requ.ired. Also, pleas.,
·note that reports required under the Act should be submitted within· 30 days of submission to the county, (see Criterion· C of attached Policies and Criteria). I realize that.this maybe too short an interval in some cases, but the reports shou 1 d be submitted for our file as soon as they are approv"d by you.
Sincerely,
E.W. Hart Encl. cc: State Geologist
'.J
Reports Submitted for Public File by J.O. Oerkland,
Santa Clara County, 6/10/75
_!l"po rt I.. Brown home s i tc, AP-654-14-017
J nvest i gator R.B. Rose
,,-2. Ferreir.1 home site, AP 110-48-02, R.B. Rose
3. Quail Canyon Subdivision for James Chidester
4. Houston single residence site (AP6J2-44-23), off Crothers Rd.
5. Barnard Road Subdivision, Morgan Hill (for Cadwallader)
6. Proposed residence Sanborn Road (for Drew)
7. Evans Road site (for Kruse)
8. AP 558-1-35, Morrell Road homesite
9. Geoelectric survey for residential water-supply, Gloria property
L R.j. Rose
R.B. Rose
Terra tech
Terrasearch
Crosby & Assoc.
R.B. Rose
J.C. Wire
Date 5/15/75
5/8/75
J/20/75
12/30/711
12/10/711
11 /26/74
10/28/74
7/23/74
8/1/72
Ferreira Single Residence Site
AP 110-43-02 Santa Clara Co. 652-10-02 (New)
NW end Pleasant Acres Road
T • 7 S , , R. 2 E • , ~D 3M Sc a I e 1 I n. = 500 ft.
Aree Aerial View
In-depth Geologic Study
' i l I i ;!
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R. Bu,foo Ro>e, lvf.A. ENGINEERIN~ Gl!OLOGl~"I' (CAL,IFOl'(NIA RICOl5TAATlON)
---~ ... ~,·~----·-
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ALLIED GEODHYSICS I I I
P.O. eox "63 ~AN .JOgE:. CA. 9510115
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(40Sl 2""·2'508 i ' ··-·- -· -----~ .... ·-·-----··_J
Ferreira Single Parcel Site
AP 110-48-02 Santa Clara co. GA 652-10-02 (New)
Pleasant Acres Road
In-depth Geologic/Seismic Study
I 11
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STATE OF CALIFORNit\
Delineated in Chapter 7 .5, Division 2 of tl':a
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compli:mco with California Public Aosourcos Coda
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RECORD Ol- SURVEY
W. J. LJf .~ t.SLt: .ll!tJ".'IVQ- ..-. _,.."RT/ON
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R. Burlon Rose, M.A. GEOL()<!.!,;T
S::NGINEERING GEOLOC.l~T
(C"Lll'"ORNIA. F/:l;Qll!foT~Al'ION)
AU.ffD GEOPHYSICS
P.o, eox BB.3 ~AN .JOs~, <;A. 9:=r,101S
In-depth Geologic/Seismic Study
Ferreira Sin~le Par~el Site Ar 110-4~-02 Santa Clara
652-10-02 (New) 1.26 ac. Pleasant Acres Road
Qlli: May 8, 1975
Introduction:
''
This study and report Is for the purpose of evaluating
the described land parcel s1te for construction of a
single dwelling. The site slopes slightly towards ttie
west. Both of the 1eologic and seismic hazards conditions
are reviewed; Including a seismic refraction survey line
through the building site and approximately normal to the
fault strike patt~rn of the area. One day's time was spent
at the site area, Including the refractlon_llne. Additional
pertinent references were revie~ed.
Locat1on:
The site is located at the northwest end of Pleasant Acres
Road, as shown on the dascriptivc mapo, ln the low eastern
t -
652-10-02 2.
foothills region of Santa Clara valley. The parcel lies
In the northwesterly quarter of Township 7 South, Range
2 East, MDBM. This parcel 11 es within the Al qui st-Priolo
Special Studies zone, effective July 1, 1974.
~:
The essential geologic, structural, seismic, fault, slope,
and topographic basic Information has been correlated Into
the maps and plates ahead of the bibliography. Following
the references Is an appendix containing related perspective
~11u background in·for1T1at1un. Th~ tit:i::>Hric refraction survey
reversed line was surveyed using a Bison signal enhancement
Model 15708 selsmO<Jraph.
General Geology:
The site l•tself ls covered with several tens of feet of
older alluvium (fanglomerate) material. Underlying bedrock
Is probably Cretaceous age Berryessa formation Oakland
conglomerate (Kego) as exposed In a few area outcrops. A
cross section Is attached as issued through the courtesy
of Mr. James 0. Berkland, Santa Clara County engineering
geologist, with the approximate site position added: his
data Is truly appreciated.and pertinent. Three distinct
seismic refraction horizons corre I ate: velocity 1. {). --~ 1 ·'1
I
v, 1500-1700 ft. sec. Organic so I I mantle
v2 2500-3700 II II Older alluvium with H-'10 1
variable cementat ion
V3 5000 II II Cretac~ous bedrock
652-10-02 3.
No springs are apparent on the site. Upslope runoff can
be control led at the upper slightly sloping end of the
parcel at Pleasant Acres Road, if found necessary.
Lands I Ide Potential:
The slight area westerly slope minimizes the potential of
landslldlng, In the future event of severe ground lurching
In a major earthquake. Such effect would be secondary, as
no fa1Jlt trace was located in the typical NW-SE strike.
Seismic Hazards:
region because of the presence of the three major active
fault systems.; the great San Andreas rift to the west of
the valley in the Santa Cruz Mts., the Hayward fault and
the Calaveras fault, both to the east. Shorter faults and
segments produce lesser shaking Intensity (Wiegel, 1970).
Bound, good construction under the latest USC specifications
should provide safe housing conditions In al I probab! llty.
Seismic RefraFtion Oat~:
The reversed seismic re1ractlon graph and computed profile
are plotted on a single plate. Time ls measured in milli
seconds and velocities in feet per Becend. Higher velocltles
correlate with more dense and more rigid rock conditions.
· Hori::ontal variations in bedrock or older alluvium relates
to differential consol idatlon or cementatlon. Such data Is
more general than trenching, but extends two to four times
652-10-02 4.
deeper. The maximum depth approximates 1/3 to 1/4 the
total length of the seismic refraction line. This survey
line was 200 feet In length, as shown on the plot plan.
Concluslons:
It Is concluded, In my opinion from a seismic and geologic
summary viewpoint, that this parcel site is suited to
relatively stable home construction with good bul I ding.
Adjacent properties should not be effected. Specifications
fn design are not and should not be addressed.
R. Burton Rose, M,A. C.E.G. 760 G.P. 397
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Ferreira Single Residence Site
AP 110-46-02 Santa Clara Go. 652-10-02 (New)
NW end Pleasant Acres Road
R.2 E., WDBM Scale 1 In. :::
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Property Outline~
(from Santa Clara Co. cadastral survey Pi ate 85 - Jan. 1974)
500 ft. ' ,., ·- .. --- --·-1
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•
Ferreira Single Residence Site
AP 110-43-02 Santa Clara Co. 652-10-02 (New)
NW end Pleasant Acres Road
T.7 S., R.2 E., MDBM Scale 1 ln. = 500 ft. '.:.• .__,
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Contour Interval ; 20 ft.
Near-Site Topography
and Sill
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Ferreira Single Residence Site
AP 110-48-02 Santa Clara co. 652-10-02 (New)
NW end Pleasant Acres Road
T.7 S., R.2 E., MDBM Scale 1 In.~ 500 ft.
0
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Bedrock probably Oakland conglomerate (Kego) of Cretaceous Berryessa fm.)
Geology and Structure
(area data from Dibblee 1972, field study, and bibliography)
Site Soil Legend
SdD San Ysidro Loam Series (minus 10% slope) overwash fan alluvium, partial clay content, runoff slow, erosion low, moderately well drained, light brown color, subject to dry season cracking and wet season closure
Geologic Legend
Qoa Older alluvlum, fan deposit Tm debri_s from
Qf
Tm
Kego
east foothi I l
Overwash fan gravel, approximate age of the older al luvlum
Miocene age Wonterey shales
probable Oakland Conglomerate (Cretaceous age) of Berryessa formation
Fault (concealed)
-- - Formatio·n contact
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Bibliography
C2llfornla Division of Mines & Geology: Prel. Rept. 18 (1973)
Sol Is of S2nta Clara Co: US Department of Agriculture Seil Conservation Service (1963), with Aerial Soll Map #12, Santa Clara Co., CA., 111 :::1000 1
Geology of the San Jcse-Mount Harri I ton Area,·cA, ~rittenden, Wax D., Jr.: State of Cal lfornla, Dept. of Natural Resources, Bui let in 157 (1951) p. 57 & maps
Geologic Guidebook of the San Francisco Bay Ccuntfes: California Division of Mines, Bulletin 154 (1951) ·
Proceedlnqs of Conference on Geologic Problems of the S.U.N t.;;,~.f ij,~,.s,, ... f a . .u 1 i S.;·.s .. te:;n,.,: .. S ta .. n f V,i~ ~ii,1· ·v···E. r'·S·.i t. j" S·.a~·S .. ·i·O·nG ~
Publicatlons/Geciogical Sciences, vol. XI (1962) (1973)
(~~o•·t:Jl_1Y OT NOrtl"l?.rn Ga.!1iorn!a! a·ul!e~!n ~90. C~!ffcrn!3 Ll1vis1on of Mines and Geology,. pp. 307-306 & p. 362 I ''10~6·, \ • ;t J
Urban Geology - master plan for California: Bulletln 198, California Division of W.lnes and Geolog7, ?• 20 (1973) . . .
Preliminary Photolnterpretatfon and Damage Maps of landsllce an~ otner Surffcfal Deposits In Northeastern S<in Jose, Santa Clara Co., CA: uSGS map MF-361 {1972)
~nvlronmental Geologic Analysis Santa Cruz Uountaln Area, Santa Clara County, Cal lforn1a, 7homa~ H. Hogers: Slate of Cal If., Div. of W.lnes and Geology, Spec. Publ. (1971)
Maps;
u.s.G.s. topcgr;iphlc map 1:24,000, scale 111 = 2000 • * Gecloolc ~ap of California: San Jose and San Francl~co
sheets, 1:250,000 (Regional)
*San Jose East quadrangle (1968 photorevlslon)
Geologic Map·of the San Jose East quadrangle: Dibblee, Thomas W., Jr., U.S.G,S, (open file 1973) 1 :2L1,ooo
J
l l j I l
'.
''
Bibliography cont.
Mooney, Harold M., Handbook of Engineering Seismology: (In progress edition), 1973, Bison Instruments, Inc.
Rose, R. 8., Portable seismic refraction studies of shallow geologic structures: 1956, XXth Intern.atlonal Geologic Congress, Mexico U.F. (published 1958)
Technical Report - Geotechnical Investigation City of San Jose's Sphere of Influence: 1974, Cooper-Clark
r , I , '\
~ Asaoc1a·tes 1separa·1'e ma·pSJ·
Seismic Safety Element: 1974. The general plan. City of San Jose CA
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EXPLANATION
GL TC.•
MAJOR i:AU!...T ZONES TC:s:ri:. er ..,.OOIE;RN "TECTON~I; C;REEPM
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Prt:liminary Map of
MAXIMUM EXPECTABLE EARTHQUAKE INTENSITY In ColftorntG
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Calif. Div, Iii Pre! iml nary
36
nes & Geology Report 18 1973
-~-~-
for the Seismic slip Figure 4.-- 1969-1971. val from time inter
1969-1971
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Andr~as fault San d for the zone compute
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11
The depth capability of engineering seismographs l>es been dramatically Increased oy the use of BISON Signal Enhancement concept by which sels· mic wa.ve.s from impact sources are stored and summed. The summation from repeated impacts
aEFORE FIRST IMPACT FIRST IMPACT
THIRD IMPACT
Here 1$ tho Signal Enhancement technique in action. If adds together signals from repeated im· pacts. The true signals always arrive at the same t!rne and add direc:tly1 whereas earth movement noise generated by vehicles, mining or drilling machines, high let1sion v1,;ires or wind, arrive at randorn times ond tend to cancel out. Tho complete wave· forrn is displayed parn1anently until erased. The Vertical MarXer is posit1011ed at the desired point on the waveform to give the digital tirne reading !n rnl!l;secoods.
USED JN Highway Route Selection. Pipeline Route
n
lu· 1.· ·.1
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IN9TRL,111,1111iNT8
bri~gs small signals up out of the background noise The enhancement feature combined with continuous display of the wave•orm and digital readout of travel times opens new fields of applications.
Sei'ec1ion. Bidding and Estimating. Water Well Locatinn. Foundation Studies. Damsite Investigations. :Aining Investigations. Geo!ogical Studies. Gravel and Rock Prospecting. Water Supply. Sanitary Landfill Evaluation. Slope Design.· Landslide lnvesti9ati1)r'I.
USED BY Highway Contractors. Pipeline Contractors. Civil Eng:nnr.rs. Geologists. Goor.ihysir::ists. Hydrologists. Architect•. Well Drillers. Mining En· qir1Qers. Archaeologists. Excavatc1s. Sanitary E:nginE::'ers.
PREPRINT
PRil'IERll CON"VEi~CION INTERl.J.r.S.:RICANA DE RECURSOS l!IIN:Sl1ALE3 - 1951 Institute of Mineral Hesources of' Mexico
American Institute of M:i.n:i.ng and Metallurgical Engineers Panamerican Institute of 11ining Engineers ancl Geologists
MINIATURE SEISMIC REFRAC'i'ION 'MA'.P?ING IN MINING AND CIVIL ENGit;EERING
R. BURTON ROSE·x
Abstract
A resru;;.e o:r a very lightweight, portable multi-channel seismic refraction instrument design x_x and its import in the fields of mini.ng and civil engin<.lex•ing studies. This compactness and portability perm.its application in 12'3.n~· shallow ecologic, foundation, ground w<>ter and placer problems previouoly either too inac•Jessible or too lin:itad in scope for laq;e scale seismic study.
Pi-=ao.tic.al. :t\2.c to:i:'S·, :i.n. · .su.cl1 r.e.mo-t.a· r.li"ld.1' o~ ~·110.x:.·t i;i;:;~~:iwd applications depend on (a) 15.i;.1. tnen s o:r complete s eisiaograrh unit, totallinG about 100 noL~nds; ( b) im£aadiate field examination of' the pt"1(J"tc:::g.r.a11r:t~ ·rAC(/'1:ctn; '(cj s.r;ecialized p;80J!l1.j.""Si.0Bl t.}(i.!"s0nr.8l eau b~ liaited to ono operator-interpreter; (d) quick field layout changes and :iurvcy progress; ( e) reduction of total nu.E1ber of ·t.ast drill holes, or eliffi.ination on reconnaissance oasis; {f) cost comparison to test rlrilling appro:x:in:ati:r.g 10 percent; and ( g) .ml.nimal basic investment or s Ul'Vey overhead costs. Depth pe:r!etration approximates one--thlrd the length r~om. shot point to far recorder, e:x:ten<le blo to any 1.naxiraum depth required.
Illustration examples represent typical instances of fi.eld problems and results.
LEVANTAfiIIEHTOS DE RE.F'It1CCION SEISllIICA EN ?,Ul'IIATUR.A EN . LA INGENIBRIA MIW!:H.A Y CIVIL
R. B1JKTON ROSE X
Abstracto
Un res=en oob~·c un instru.m.ento m11y liviano, _portatil, de mul ti-canales para rcfracci6n seismica y su i.r:iportanc ia on los campos de estudio de ing,3nieria minera y civil.
Lo cowpo.cto y portatil del aparato perinite su aplicaci6n• en muchos sition con probloma geol6gico per cl oscaso fondo dGl cimiento, por cgua en el terreno o por obsti':culos en los placeres (!Ue antGriormente f'ue1·on, o rnuy irni.ccesiblG:~ o muy limitados on extGnsi6n para nn estudio seismico en gran oscala.
· La penGt1·aci6n p1·ofu11da aproxll:iu un tercio la distancia del punto de explosion nl registro a diGtancJ.a, que es extensible a cU<olquior profnndidad que so reqtiiera.
v .
~ Gcologist-5eoph:rsicist, Box 583, San Jo:~S, Calif'orn:ia, U.S.A. }..7 1'ate!1t<> nre :per.ding - Ce;~tlll-y G2o:;:hysictd co.qio:::at;ion.
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CENOZOIC TIME-SCALE In millic.1u; of YICIH
(After Arthur Holme>, 1960)
Plelstoc~n~ I .
Pliocene 10 • I .
• 11 . · . Mioecno 14 ~- • 25 Oligocene 15 .
[r;,!'.:Qil(j M • 40 .. ~u I Paleocene 10 :
60 .
70:!'2
GEOtOliiGt1t TiME-SGi\LE In rnillicnt; Ctf yeci:u
(After Arthur Holmo>, 1960)
Tertiary ·. 70 ·. .
Cretaceous 65 ~ 70:':2 -······ ·;··~----- • 135:':5 Jurassot 45 Triassic 45 • 180:':5
Permian 45 • 225 :!:S --- U70:':5 Carboniforous 80 D~'ltinian 50
$350:!:1(
Si!urion .
40 04CO!U
Ordovician 60 ,$440 ! l(
Cumbrion ICO +soo± 11
Procambrfon ?. -0600:!:21
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Geachnm Laboratories, Inc. Geological Age Detcrminatlons
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