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STD. FORM 118 (REV. 7•72.l 6. OSP
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FOR ACTION AS. JNDICAIED· _ 0 -REPi.Y~Y SIO~tuft 0 REPLY-COPY TO ME
0 PLEASE SUMMAR.tZE
0 PlEASE INVESTIGAT£ _ ·
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-.·. -STATE OF CALIFORNIA-THE RESOURCES AGENCY
DEPARTMENT OF CONSERVATION
DIVISION OF MINES AND GEOLOGY DIVISION HEADQUARTERS RESOURCES BUIL01NG, ROOM 1341
1416 NINTH STREET
SACRAMENTO, CA 95814
District Offic:es: LOS ANGELES
Junipero Serro Bldg., -Rm. l 065 l 07 South Broadway 90012
SACRAMENTO
Resources Bldg., Rm. 118 1416 Ninth Street 95814
SAN FRANCISCO
Ferry Building 94111
March 31, 1975
Mr. A,R. Turturlcl Director of Public Works City of San Jose Room 308, City Hall San Jose, California 95110
Dear Mr. Turturlcl:
RONALD REAGAN, Gover11or
We are placing on public file the following report, resubmitted March 18, 1975 and approved In accordance with the Alqulst-Prlolo Geologic Hazard Zones Act:
Moxley Single lot Homeslte, AP 595-21-016, lot 20, Rancho View Court, City of San Jose -- Geologic/Seismic Refraction Report.
EWH/mkr
cc: State GeologlstJ.""""
Sincerely yours,
EARL W. HART Geologist San Francisco District Office
• -· .-CITY OF SAN JOSE CALIFORNIA
..
801 N. FIRST ST.
IAN JOSE: CA 95110 TELEPHONE 1408) .2.77~4000
Room 308, City Hall
DEPARTMENT OF PUBLIC WORKS 18 March 197 5
California Division of Mines and Geology Ferry Building San Francisco, CA 94111
ATTN: Mr. Earl Hart
Re: Geologic Investigation of Moxley Homesite, Lot 20 of Assessor's Parcel 595-21-016• Santa Clara County (Previously submitted February 28, 1975)
Dear Mr. Hart:
Enclosed is a_Special Studies Zone Geologic Report for a homesite in San Jose's eastern foothills. The report was refused under the previous submittal "until reviewed and approved by a registered geologist on behalf of the City ..• " (Earl W. Hart to A. R. Turturici, 3/10/75).
This report was reviewed and approved by the City's staff geologist, Willard Todd Nelson, registered geologist 2641, whose signature appears below.
The other report (Daniel J. Rhodes and Associates for Presley Development Co;-; ___ at Story Road and Machado Lane) will be returned separately when it has been signed by the reviewin9 engineering geologist, Jeremy C. Wire, and when Mr. Wire s geologist registration number has been indicated on the report. ·
v ERT:TN:bc
A. R. TURTURICI Director of Public Works
:£~..__··_LZ __ · E. R. TOSCH! Prine. Civil Engineer Engineering Services Division
Encl. Geologist Report
Reviewed by: Willard Todd Nelson Geologist 2641 //, .. -ff;:? !:/:C ~ cj ?J.;;r.'£;/ ;Ytc{;'C'.-i;.t_.
R. Bu.Ion Ros€, MA. GEOLOGIST
ENGINEERING GEOL.OGlaT
'CAL.11"0,.,.,.IA Al:~+SiT .. ATlON)
ALLIED GEOPHVSICS
P.O. Box !583 SAN ..IO&E, CA. 95tOa \406) 2!SS-2.698
and reporting on the geologic and seismic aspects of building on your east side land parcel AP 595-21-016, ioca"ea on Rancno v1ew ~ourt.
The accompanying report delineates both the geologic data and summary seismiclty: augmented with a detail seismic refraction line placed across your lot.
The location Is on a broad westerly sloping crest between the drainage courses of Cropley and Crosley Creeks: a cut pad site fn a partly developed existing sub-division.
The lot lies within one of the Alaulst-Frlolo Special Studies (Fault) Zones as shown on the excerpt from the July overlay, 1974, on the Calaveras ~eservolr topographic auacran~le. It lies between the Crosley fault trace 6CO feet westerly and :ne ~erryessa fault trace ('l) 300 feet easterly •. ::;wrf2ce sci I Is underlain by average velocity of 52CO ft.;se~. becrcck, iraicating a stable consolidated bedrock with Its upper horizon dipping towarcs the west (seismic refraction exaggerated vertical scale x~section).
From a geolo·,Jic and seismic vi e.',.point, latest edition uac design standards shculd provide an adequate safety factor, using an acceler2tion figure of 0,15 g.
Respectfully su8mitted,
R.. Sur t c n 'ic s e ::c::;76c ~;f'397
Moxley Single Lot Homesite
AP 595-21-016 Lot 20 Rancho View Court, San Jose CA
Between Cropley and Crosley Creeks East of Piedmont Road
Approximate scale 1 In. = 500 ft.
Area Aerial View
Calaveras Reservoir quadrangle, 1:24,ooo (1968)
Contour interval 40 ft. 0 AP595-21-016
Pueblo Lands of S2 n Jose Scale 1
Moxley Single Lot Homesite
Rancho View Court, San Jose CA
Between Cropley and Crosley Creeks East of Piedmont Road
Approxl~ate scale 1 in. = 500 ft.
Property Outllne Wa_£
(from Santa Clara Co. Cadastral Wap 37, Jan. 1974)
(from US~S Calaveras Reservoir 1:24000 quacrang!e and us Dept. Agriculture "Soils of 0ant:J. C!:;ra C~:..:~ty C.'1 .• ~96::1)
Moxley Single Lot Homesile
Rancho View Court, San Jose CA
Between Cropley and Crosley Creeks East of Piedmont Road
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-Approxi~ate scale 1 in. = 500 ft.
Geologv and Structure
(area data from Qlbb:ee 1972)
Soi Is:
Ac£2
CnD
Geology:
Legends:
Altamont clay (slopes 15 to 30 %l eroded, moderate sneet erosion, Includes some small landslides, underlain by soft to hard type sediments, usually neutral to alkaline, cracks deeply when dry, well drainea
Climara clay (slopes 9 to 30 %) scattered ~ro~Q nT IP~~or ~lnnP~ wet I rl~~in~rl- nvPrllP~ -·--- -· ·----· -·-~-- .. ··-·· ---·· --~ --------metamorphosed basic igneous rock usually, well aralned, medium runoff, moderate erosion, -:--- -·--- ---~--· __ _, ---·- --··-----ll!lllU! ~l.Vllt:: \..Vlll..t:'lll.. 0..llU I 1.11..-,..., VU\.""I VtJo;>
Qal Recent alluvium, sediments Including gravel, sand, silt, and. clay
Qls Landslide debris of mixed rock ages and times of original movement
Qsc Pleistocene Santa Clara formation, slightly consolidated non-marine sediments including full rar:ige of material sizes as cited with a I I uv I um
Ksh Upper Cretaceous age snale (micaceous) Berryessa formation; sandstones, slltstones included as thin lenses
Keg Cretaceous age Oakland conglomerate, marine sedimentary source, cobble and boulder conglomerate mixeo with finer matrix
f Jurassic a;e (possibly Knoxvi I le) Franciscan thoroughly sheared rock structure, shales, sandstone, graywacke
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I f·-.J'.3T F":Uivil.::;-.n s 5703 · 2Gth Str:::!~ v·:":i:t 21. I uuis C'.:i L, f\~:nn. f;~},116
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Book 595 page 21 Parcel 016
,y
1 I
1"=100'
;:·JJ. ~ T: T: (J ~~ ::·· F T t-1 ~ :_ ~ ~~ O S 0 F- J\.~ ~ ~ ! A J C· S E F ..'l 3 ~: ~ ~:YES SA ~ T. A~-·=;-:.-:.:=_;---=- ::-=--::· ·.-;--:-::-_-_;.·.-~-=-·==-:-=-:·-:..::-::::::=:~..=-.:-.;:::-~-=~-::::::;-_: -~:-- ;-.,~_;-==._:: __ :-_:·=.:·_:___c..=--- - -:::~~"::".:..-
California Division of Mines & Geology: Prel. Rept. 18 (1973)
Solis of Santa Clara Co: US Department of Agriculture Soil Conservation Service (1968), with Aerial Sol I Map #12, Santa Clara Co., CA., 1 "=1000'
Geology of the San Jose-Mount Ham! I ton Area, CA, Crittenden, Max o., Jr.: State of California, Dept. of Natural Resources, Bui letin 157 (1951) p. 57 & maps
Geologic Guidebook of the San Francisco Bay Counties: California Division of Mines, Bulletin 154 {1951)
Publications/Geological Sciences, vol. XI {1968) (1973)
Geoiogy oi Northern Caiifornia: 8ui iecin 1:io, 1;a1norn1a U1v1sion of Mines and Geology, pp. 307-308 & p. 362 ( 1966)
Urban Geology - master plan for California: Bulletin 198, Cal ifornla Division of Mines and Geology, p. 20 ( 1973)
Preliminary Photointerpretatlon and Damage Maps of Landslide and other Surflcial Deoosits In Northeastern San Jose, Santa Clara Co., CA: U~GS map MF-361 {1972)
Environmental Geolog\c Analysis Santa Cruz Mountain Area, Santa Clara County, California, Thomas H. Rogers: State of Calif., ::>iv. or Mlnea and Geology, Spec. Publ. (1971)
Maps:
u.s.G.S. topographic map 1:24,000, Scale 1" = 2000 I * Geologic Map of California: San Jose and San Francisco
sheets, 1:250,000 (Regional)
*Calaveras Re::;ervolr quadran:il e (1968 photorevlslo.:i)
Geologic Map of the Calaveras Reservoir quadrangle: Dibblee! Tnomas ·.v. ·~1r., u.s.s.s. (open ·file 1973) 1 : 24' 000
•Anodatcd wirh large c:irthquakcs arc dusteri or smau._.r earthquakes that may produce repc1iti"c shaking of the $Ume location, To di~count this for probabilitycakulations, wme or lhc earthquakes having .\I < 6.0 ha,·c been omitted.
. of course, a possibility that the site is covered more than once by the specified ground acceleration and the probability of being covered n times is
p(n, a)= { ~ )" ~!e-•i• (4.2)
It should be noted that the probabilities gi,·en in Table 4.6 are too high for some of the less seismic regions of California and too low for some of the highly seismic regions.
General Comparison of Scales Used to Rate Earthquakes at the Earthquake Epicenter*
Intensity
Magnitude Modified Hercalli Rossi-Forel Richter Scale scale eo'.li.valent Effects on persons Effects on structures other effecU
I I
2.5 II I-II
III · I"II
3.5 IV IV-V
v .,_VI
VI VI-VXI
5.5 VII VIII
6 VIII VIII-IX
ll ll
=
8.0 x
8.5 III
Not felt e:.iccept by few under favorahl• circumstances
Felt by fev at re~t
Felt noticeably indoors
Felt generally indoors
Felt generally
Felt by all, Ser/ frightened
Everynne runs outdoors i felt in lllOVi.ng: ca~
Genera1 alu:a
Panic
Pan.le
Ponl.c
S<.ne plaster fall.9
01.inleys • plaster domaged
Moderate damage
Very destruc+...ive and qenera1 da;nage to weak: structures. Little dama.c;re to well-built structures
Total destruction veak structures, consider.Cle damage well-b'.lilt structure&
M"'qnnl'! and frame stRctll.--eS eonmor.ly dastroyed. Only best buil.dinqs survive
Fev buildinqs survive
Total destructian
Delicately ••ls.pended cbjects swinq
Duration estimated
Cars rocked, vindCMS rattled
Dishes, windows broker pendulu:n. clocks stop
Furni. ture moved, cbjects upset
Monuments, walls dcwn, fu~iture overturned. Sand and mud ejected. Clang~
in well-water levels
Foundations dama.9ed, under-qround pipes broken
Ground badly cracked, rails bl!nt. Water • lO?ped over banks
Broad fissures, f&ul t sea.rps. Under-qround pipes out of service
Acceleration exceeds gravity. Waves seen in qround. Lines of 11i9ht a."ld level distorted., cbjecu t...~own in air
ROTE1 .Magnitude and Intensity of an earthq\:.ake are entirely different measurements of earthquake ene%'9Y or effectll, and can only be ccimpared at the earthquake "!pi center.
Ka<mitude - is a n~er derived from instrumental measurements, and is the measure of the energy releue4 by the edrthqua.ke. There is !!!!. Magnitude e&l.culated for each e.uthquak.e.
Intensity - is a local .ratinq cf ea.rt.lot.quake effe~ observed and reported by peopl11r; at any qiven location.. Intensity ratings fo'!: one eart..'l.quake vary considerably depenCing on dist:ance from epicenter, the nature of the soil it&nd rock beneath the observer, and the cb3~rver's interpreta-:.ion of events seen or felt.
HORIZONTAL range and depth capability without exPlosives Is doublfid.
ACCURACY Is Improved In H!gh Noise Areaa (urban, mining, construcllon).
SIMPLE operation 11 eaally , ........... . SPEED In ll9ld work equal• or imp<oves on 1lnsle or mulll-trace !:)'Stems. lnterpretalicin '• on-ell•, euminatlng omce nmQ.
PRECISION reading of time to any point on lhe slflsmic Wil\IP.form.
VERSATILE pcrlormsnc$. Cornplele, undlslorted wavelorm Is dla· pla!"ed pllrmanently over &nllre sweep untll era'Jed, may be record:!d en accessory seismic recorders or Polaroid film. Will accept mo'lt standard trsnsducer! for use on land. marsh, oftshcre or downhole measurementa.
INSTRUMENTS
,...._ ~ '~_.-.:.-...-.~ w,;;:-
The depth capability of engineering seismographs has been dramatically increased by the use of BISON Signal Enhancement concept by which seismic waves from impact sources· are stored and summed. The summation from r~peated impacts
brings smali signals up out. cl the background noise. The enhancement feature combined with continuous display of the waveform and digital readout of travel time:) opens new fields of applications.
~-~"".J4!'&4e44f.. _.:~,-- 1\"1"1'ril<"/%1%kl'.?.:;t~!i!L.l.1l, : "i .. ~·
l .- ' l ' ;,;t?tiif®51:~;_.-.:.ii. ... <0.s:drti.Wii-:<-J
Four
Here ls the Signal Enhancement technique in ac· tion. It adds together signals from repeated in1-pacts. The true signals a!\vays arrive at the same time and add directly, whereas eanh movement f1C'i~8 generated by vehir.!es. mining or drilling machines, high tension wires or wind, arrive at ra!ldcim !irnes and tend to cancel out. The completf..: v-.1ave:-,::-:1 is dis;Ji3yed permanenti:-' until erasRC. l-h~3 \'ertica! Mc.rf.er is pcsitloned 2'. the desired poi:'!! on :.he vva•.'eff_irrn tCJ give the d:gi~a.! tin1e reac1rg ir: r:-ii:I .seconds.
us;::D IN Higi1\.vay Ro;Jte Selection. Pipeline Rou~e
Selection. Bidding and Estimating. Water Well Location. Foundation Studies. Darns;te Investigations. ~Aining i'lvest1gations. Geological Studies. Gravel and Rock Prospectrng. Water Supply. Sanitary Landfill Evaluation. Slope Design. Landslide In· vestiga~ion.
?RIJ:iERJI CONVE::C:ION INl'ERAMERICANA DE RECURSOS MINERALES - 1951 In::-titute of hlineral H.esources of Mexico
American Institute of Mining and Metallurgical Engineers · Panamerican Institute of Mining Engineers and Geologists
MINIATURE SEISMIC REFRACTION MA.t-"'PING IN MINING AND CIVIL E!v:tIHRER.Il~G
R. BlJRTON ROSE X
Abstract
A resur;:;.a of a very lightweieht, portable multi-channel seismic refraction instrur:ient design xx and its import in the fields of mining and civil engineering studies. This compactness and portability permits a?plication in many shallow geologic, foundation, ground water and placer problems previously either too inaccessible or too li~ited in scope for large scale seismic study.
Practical f6.c·~or::i in· such remote 1!.c.u/or short period ,.;.._-_-..,,! _ _=_._-;:; ___ -:>-~---,:1;- -- -1-.--, -.,.!,;_,_..i.; __ ,:..-;_ --,;,..-~--:.:;.-_~_.,-_.:..--~ . ...;._.!,...._...;.~_;,,..;._;'t... -.~~~.L
totalling about 100 _ryoLcnds; ( b) imr;;.el!iate 1'ield exanir..ation or the photographic reco~da; {c) specialized geophysical personnel can bs limited to one 0perator-incerpreter; (a) auici: r'iold layol1t cnani;;es and survey progress; (e) reduction o:f total number o:f test drill holes, or eliminatiqn on reconnaissance basis; (f) cost comparison to test drilling approxi~ating 10 percent; and (g) 2iniffial basic investnent or sm·vey overhead costs .Depth r;enecration approxisates one-third the lengtl1 frora shot point to far reco::-d.er, extend.able to any maxL~um depth required.
Illustration examples represent typical instances of field problems and results.
LE'/ • .;NT.Mi!IEE'l'OS DE REJ<'R,'\CCION SEISBICA EH 1.ITNL'<'l.'w>J, EN LA INGElffe'.RIA MINEP.A Y CIVII,
': R. BlJRTON ROSE x
Abstracto
Un resu.'llen sobre un instru.'!lsnto !nuy li-:iano, portatil, de multi-canales para refracci6n seiscica y su L".!portancia en los caa:.pos de estudio de ingenieria minera y civil.
Lo compacto y portatil del aparato perm.ite su c,plicacion en JJ).UChos sitios con probloma geolo(;.Lco por al escaso rondo dal cir:J.ie.::lto, por o:gua en el terreno o ror obsticulos en los placeres q_ue anteriornan~e fueron, o !:lt!~l inac:cesibj~es o m.uy limitad.cs en extension para un estuiio sei3~icc e~ g=an escala.
· La pe·netraci6.!J. prcf·ur1da ap2 ... oxim.a un tercio l.a distar1cia del punto de exJ~losi6n al registro a d.istancia, que es extensible a cualquier profw:;.didad qui; se requiera •