W.O. 696-30

'(3 tJOc;_<)O C 0 .

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ADDITIONAL SOIL JNVESTJGATl9N . · .. ·· stOPE curs ALONG UPPER PORTION! ·· ·

OF ROAD "A" (PHASE 4}

AHtJIMANU VILLA SUBDIVISION (WOODR�DGE) · . AHUIMANU, OAHU, HAWAII

FOR

. ,DEVEX CORPORATION

GEOLABS-HAWAII

1553 COLBURN STREET, SUITE 202

HONOLULU, HAWAII 96817

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H5 H 6 r ·

.... l'f•· :·( f1

JULY 11, 1979

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GEOL.AB S.:. H:.AWA I I Geology. So.ils a�ci Foundation

1553Colburn Street, Suite 202 • Honolu1u,Hawafi 96817

Engine e r i n g

• (808} 841-5064

Devex Corporation Suite 410, 900 Fort Street Pioneer Plaza

·

Honolulu, Hawaii 96813

Attention: Mr. terrance Wong

Subject:· Letter Report

July 11, 1979

W.O. 696•30

Additional Soil Investigation Slope Cuts Along Upper Portion of Road "A" (Phase 4)

Gentlemen:

Ahuiiilanu Vilia Subdivisia.n (Woodridge) Ahuimanu, Oahu, Hawaii

In this letter, we summarize the results of our additional

soil investigation in the above referenced subdivisi6n.

The work was performed according to our proposal dated

June 21, 1979.

The originally planned cut slope in this area was designed

at 2 horizontal to 1 vertical (2:1) and had a maximum vertical

height of up to 40 feet. In order to increase the level lot

areas for this portion of the project, a 1!-;z horizontal to

1 vertical (1!-;z:l) slope ratio is being considered for the

cut slope. The revised slope cut will have a vertical slope

heig�t of up to 90 feet.

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D�vex Co�poration W.O. 696-30

.

7-.11-79

p. 2

·· . .t'

The pu:rpose of the supplementary inv(;l s ,ti,gation was to

perform drilling, logging, representative sa�p U.ng and . ' · · . - · . . . .· ' .

lab ora tory testing;·" 11pon, which � tabilltY.· (l:galy�.es t<n�

th� re�is�d slopi cuts could be base4. ·'

The grading plan, included with this report a� Plate· 1',

indicates the approximate loc�.tions of the three subsur-

face borings.

Field Exploration

� '

The field work consisted of three additional �xploratoiy

borings (21, 23 and 41 feet deep) and a visQal reconnaissance

of the proposed cut area. The drilling was accomplished u.sing

trucl<-1Jlounted, rotary drilling equipment with continuous flight,

solid stem auger. The borings were continuously in�pected.

by an engineering geologist from our firm. The boring logs

are presented on Plates A-1 through A-4.

In all borings, either standard split spoon samples or 2.4-

inch I.D. ring samples were taken at selecte� depth intervals

of approximately 5 feet. Both the standard penetration test

spoon and the ring sampler were driven 18 inches with a 140·

pound hammer falling ·a distance of 30 inches. The number' of

blows required to drive the samplers the last 12 inches. is

shown on the boring logs.

GEOLAB.S-HAWAII "

. . ' . . Deve� Corpo�ation w.o.:· 6Q6-30 ... · · · 7-11.:.79 ' p. 3

Laboratory test�ng . · - .

' � .

. '• 'r·,

·· ', · '\ . , ·'··. _:.-·.·.· . . ·· .

' ,:.

' ·. -:: ·

. Laboratory. testing i11�l\!ded. moisture content·, na�11r.�1. deils�·'ty,' ,

Atterberg. Limits, e1nd sa·turat�d direct sh�ar .tes,�·�·;

.. ·: .. · ··· Th� · ' identification. test <Jata .are ge.nerally ; �o

'tf�.� �� ;t�e�q,o�tfri

logs.;.· the direct·shear tes.t r¢sult$ : ��e ·.�h�w�?qn >P.I�t·�s A'"�·-. . . . . . .• :.·, . . ·� . .. . . . ' -' . . through .A-. 7. ·;··· ·"

Soil Cortditions

Based on the borings and field observations, .the sio�e� are·

underlain by a strata of cl�yey silt and highly·we�ther�d : . . '• .. . ', . ·. . •. volcanic-s (residual soil}. The surface soil deposits .GOI1- . · · . sist of fr·om 3 to 19 feet· of clayey silt with little .grav�l. · The Upper soil stratum is generally stiff to very stiff. ·The

'· underlying :formation gene�ally cortsists of very sti�f to hard

but highly weathered volcanics (the term.volcanics is used'

herein to describe undifferentiated complex rocks consisting

of dikes and lavas of the Koolau volcanic series); see Plate 2.

Detailed description of materials encountered .are ·presented·

on the boring logs attach�d.

Very slight perched water seepage, and groundwater was encoun­

tered in Boring 3 (35 feet ,deep). Presence of�arbonate deposits

in this and in other borings generally confirms previous exten­

sive perched water levels.

GEOLABS-HAWAII "

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. . . Devex Corporation

w • 0 • ; 6 9 6 � 30 , . . 7-11-.79

.

P .• 4 · ·. . · .. '!

DisGuss�oi1 an,4 RecoinmEmdat,ion� .. . , .

. . ,

St�bility analys·e·s wer� perfgrmed� for tb_e. two mal(;>':r CJ.it · slopes., Based.: upm1- the 'pro.pos�d s

.lope ra�i():Qf !·�::{>tk:\r} · ·· ... ' . - . •. . . . . . .

. ' ·, . ';._ . . ·.- . . : . '· '• ·; ·\ ,, .·· . . ' �: -�·-·- '. . . and measured streng·ths after saturation (show·non Plates · .. • -' • - • • • • ' • • ' • ' • " • • - • • " • � ' • : • • • -·. • ' ' : : ' ' ·, ;_ <. ·'. ·;·; _-,;. ••• .::�_.; _:'·-: :-� i. ., . � : •. ' •• A�S-through_A�T), 'the calculated. facto�s

· of s'�f¢ty. t�rtg:e . . ' . ·-. . .. . . . . , •·. \ . . · ..

from L 3. to _1. 5 d�pen�ing upon detail·s·: of the ,m·�.thqd.· of

analysis .. The analyses consider a .1!-z horizontal to 1: ve.r- · tical slope ratio with benches pr terraces· every20 to 25 . . . feet of vertical slope height.

Because of the relatively low calculated values £or·.th�

f�ctor of safety, the presence of perched water and. water

seepage, and the highly weathered cond!tion of the.bedrock,

it is very important to provide intermediate terraces at

intervals of every 20 to 25 feet on the slope faces. This

will help to regulate and control erosion, 4ebr{s (sediment),

surface water and groundwater, and helv the overall stability

of the slope.

Based on our present data·· and computation, it is our opinion

that the proposed 1!-z(H):l(V) cut slopes appear to ha,ve adequate.

overall factors of safety and should perfotm �atis£actorily if·

constructe4 according. to the recolllDlendations pf this supple­

mentary letter report. _Due to the presence of the underlying

dike formation and resultant perched watet levels, some shallow

localized sloughing could occur if sufficient water pressure

GEOLABS·HAWAII "

· . , '

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Devex Corporation W.O. 696-30

7,-11-79.

p. 5

bl1ilds up n��r the slope face, however major sl.ope stability ""

problems are ndt anticipated�

The cut slbpes �hould be adequately prepa�ed and plant�d .

immediately after completion of excavations ·to m:fnim:i.�e .. . .. .

surface erosion. It is f11rther recommended th�t one. of . . . .

our geologists periodically inspect the'cut slopes during

excavation oper� tions to observe other unforeseen soil con-

ditions.

Investigation Limitations

Our services consist of professional opinions and recommen-

dations made in accordance with generally accepted soil and

foundation engin�ering principles and practices. This war­

ranty is in lieu of all other warranties either expressed or

implied.

The analyses and recommendations submitted in this report

are based on our site reconnaissance, soil information from

.boring data and laboratory. tests obtained from this soil

:i.nves tiga tion.

Unanticipated soil conditions are conuilonly encountered and

cannot be fully determined by taking soil borings. These

unforeseen conditions such as soft spots and seepage water

may occur fn localized areas.

GEOLABS-HAWAII ...

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Devex Corporation W.O. 696-30

7-11-79

P .. 6

. : .. · . .. .

we· trust that this brie� letter report provides the supple�

mentary information that you require. If yo11 have apy ques- ..

tions, or desire ad<.li tional information, :please (:on ta�t·,·us.

Resp�ctfully submitted,

C.W. ASSOCIATES, INC� dba GEOLABS-HAWAII

By

BYKW:CSM:cw

Enclosure: Plate 1 - Boring Location Plan Plate 2 - Generalized Cross�Sectiop Plates A-1 thru A-4 - Boring Log$ Plates A-S thru A-7 - Laboratoty Test Data

XC: Gray, Rhee & Associates, Inc.

GEOLABS-HAWAII "

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. . ELEVATION

·<FEETl: . . . . . .•.

· . . --- ,'300······

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WEATHERED VOLCANICS

Q WATER- LEVE'L -::- (6-25-79)

GENERALIZED CROSS -SECTION'

GEOLA.BB- HA.VVA.II

.Foundation &. Soil Eng1neer1·ng • Geology

DATE

JULY 1979

SCALE

liN. =40FT.

DRAWN BY

GMY

W.O. ·

696-30

PLA

BO�ING · . 1 I

I Sample--· ....,...__,...,......,.,,....._,.........,

Dry·denaity (pcf) �- Depth ( f�et) .

·•• rGraph

· . Surface elevation.· 1.8.6' !

(ESTn1A'fED FRQ\1 HAND.: I

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� 78

� 80

� 114

9 Blowe. per foot 50 40 30 . 20

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• � . �25 1.:

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• Moisture content LEGEND

I

I 2 .o" 0.0. split- spoon sample

TI Und i sturbe d ring sample

I Disturbed ring sample

I Core sample

P Sampler pushed

0

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LEVEL READING) .... SOIL DES.CRIPliON·. . usc . . � . . . . �

RED��ROWN tLAY�Y SIL£, STIFFIMH

. . :. ' REP & . YEL{.OW·<BRQWN .

..liGHT ;GRAY ·& ·. BROWN ···wrTH

SOME' GRAVEL. (WEATHERED ROCK F.�GMENTSl·:: .

... . .

. CARBONATE DEPOSITS (WHITE)

MOTTLED & RED-BROWN WITH LAMINATIONS (EXTREMELY WEATHERED VOLCANICS)

MOTTLED YELLOW & RED-BROWN HIGHLY .WEATI-IERED VOLCANICS WITH SEAMS & LENSES OF CLAYEY SILT, HARD

ABUNDANT FRACTURES

DARK BROWN & BLACK·

BORING TERMINATED AT 23 FE ET ON 6�25�79

WATER NOT ENCOUNTERED

Plastic lin,it �

LOG OF BORING Liquid l imit _.A · · � Natural water content a.:a:oL.ASe-HAVV.A.:u •

FOllnd.aun:z::. Ene1r.-1·:na • Rr111 Er·,ar,.n..,.rLna • �I· •arY

Driving ener gy = l40 lb.wt.,30"drop W.O. 862-00 JULY 1979 "PLATE A-1

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· .· . �ample--------�� ... . Dry. density

9 Blowe �er f�ot .. 50 . 40 .. 30 20 10

•

'· �·.

... · · . .· · •.. S�rfaca· elevation 238:'-f ·

• ... ··.· .: · .i .. . ;.· ·::�����:�.< .... · $OIL <·bf"$C.R) P.TfO�( . ; ·. ' : , . :� ·� c :I ' . RED.�BROWN·:CLAYEY ·.sTtT, ·. STIFF MH

.. �.; ... . _.., . ·>·;:.,:.;� \··::•·, '·' . :'•'/··· ccccc:-:,, ·:r · ·, .; . ·.:· ·.:. ,,-·:,; . .. ,.· ·: . . · ..

.· : " , '};'''}j:';J,''iC <! ·. · '\ 1.·••• .

••

:···'··

�·-··' I

.. ,{5 . • T; , I

:. MQTT:J_.ED,\.&,,R:E�-BROW:N., HIGHLY< . :: WEATHERED:VOLCANTCS WITH .·;:; . .. ·�

·' ':.*��;,�t�f�!-';�m;�����l}�. · • , .•... ·. · , ... ·.··

···:_;A:BUNbA:NT>·FRACTUREs··.wrTH : ·'

159

155

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• Moiature. content · LEGEND I 2 .o" 0.0. split- spoon sample [ Undisturbed · ring aample

I Disturbed ring sample

I Core sample

. . I .· : · ·.·. ·.··

To

. I 15 li

I[ 20

•• "•��'".�f��n���7()1'J'SI�'r 2'

; ' '· . · . MO'f'I'LEil, . RED·j :.iELLOW & ·GRAY:.

BROWN · . . ··•·· ', . " . . ; .

. . . '

LIGHT .GRAY,. RED·•&.· DARK BROWN MEDIUM WEATHEREJ) VOLCANICS, · .

LAMINATED. WITH CARBONATE . .

DEPOSITS,,. FRACTURED,·. HARD .· � . .

BORING TERMINAT.ED 'AT 21 FEET ON 6'�2 5 � 79

WATER. NOT ENG0l1NTERED

Plastic limit �

LOG ·. O F BORING Liquid limit _Jf · · � Natural· water content { .. a-sox..AB&.,.HAWAJ::X

' ) P"C)\&!:\datann lt.t:'&ln-:erap.c • Bnal Enjl'lnfM'Iorln& e o..nJ< l&'Y

P Sampler pushed .. Driving energy :140 lb. wt., 30"drop w.o. 862-00 JULY 1979 '"PLATE A-2

'·:\

•

.... .. ,

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Q . Sample.........-

· BORING .

3· �' '·• ,'1· . -. . . . SHEET. 1 .OF 2 c·' -:.:/.-. < . ' .-- •• :··_ • •• _ · .

.-:'-'..�-" _

.. ' , •• .. ··

WATER LEVEL

Ory · denait¥ ·( pc f ) Depth.·(feet_) ' ··• •. · ·

. -Surfac�- elevciti�n�:2l7'·!

.Graph .

. . .• - ·. ·

.- .• : • .

.

. ·. . (EsTIMI\TED tRGi HAt�) < . .

· . . . . LEVEL. REAPING} . . 9 Blow• per foot .

50. . 40 • 30 20

•

129

. I 125 I I

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98

80

104

85

143

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�I 3 5 - ·6·:-zs-:79

. SOIL DESCR.IPTI()N · . ,, . · u 1 c ·. RED-.BROWf{.CLAYEY . ST.LT , _ STl;FF.IMH·-.. :.�:·-.. : •' .. - ,' _: �- �-. '\.. ,/?

.. ·-·.- -<:

.... . . ,

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:C.ARB().NA�� ))EPPS.lt� • CWIJ:ITEJ (

>·�9�rt�� ��["&!. 9�¥· �;a�VN ·· · •·.

.. '.MOTTLED.'"RED. _,;&.:YELLOW -.BROW N .

::·WITH SOME. GRAVEL �:(WEATHERED · �()C�. f�R.A�fvi¥NTS), : - · '

. .

. .

MOTTLED WITH I,.AMU�ATIONS, VERY Sl'I.Ff ..

MOTTLED YELLQW, GRAY & REP-BROWN

.. . .

RED & YELLOW _, 'BROWN H.I GHL Y WEATHERED VOLCANICS, SOME FRACTURES-& LENSES OF CLAYEY SILt , HARD

.

(SLIGHT WATER SEEPAGE AT 21 FEET) · ·

.

BLACK FRACTURE .FILLING MATERIALS (SLIGHT WATER ·

. SEEPAGE) - . .

.

MOTTLED-GRAY·& BRQWN

VERY STIFF

• Moisture content LEGEND cONTINUED ON PLATE A� 4 ·

LOG OF BORING I 2.0"0.0. aplit-apoon aample IT Unditturbecf ring aample ·

I Ditturbad ring tampla I Core sample P Sampler pushed

Plastic limit .

.

·� Liquid limit _,A · � Natural water content� f o:aaox...A&B-HA"OVA:u l

ronncsota�n atna1n-z•n• • Snu Enc1n ... r•n• • �lf•ICY

Driving energy:l40 lb.wt.,30''drop W.O. 862-00 JULY 19 "PLATE A-3

\,

· ,

. �I

-�-�

BORING, 3 Sl-JEET 2 OF 2

Sample _ ___,.,_,.,......_,.,..,,....,..

Dry . ��naity ( pc f ) �

...---- Depth l Jeet)

.-Gr�ph

.Sur'face elevati.on

•

9 Blowe per foot so 40 30 20

•

J

10

8 Moisture content LEGEND I 2 .o" 0.0. split- spoon sample

II Undiil,urbed ring aample

I Disturbed ring aomple

1;, l'r Core aomple

. P Samplgr pushed ____ ;..__;__....;..,.. ____

0

-

-

-

-

-

-

SOIL. DE:SCRIPT!ON

BROWN: &··RED�BROWN �··HIGHLY WEATHERED:VQLCANICS, . 'FRACTURED.· WJTH CARllONATE . PEPQSITS; & q.AYEY SILT LENSES VERY :STIFF ·.

'' " '' ' ' " ' ", ; ' ; ':' ., ·: '

:·.·· •. ··,o· :.' • , .

. BORING''TERMINATED AT' 41�S.FE�T 0� 6�is�79· . . . .. . ·-; .... ; .

. . .

WATER ENCOUNTERED AT 35 FEET

SLIGHT WATER .SEEPAGES ENCOUNTERED AT 21 AND 26 FEET

Pl.ast.ic l�mit �

LOG OF BORING L1qu10 !.l�it _,.I · " . ··. ·� NottJral water content o:a::ox..A:aB-HA"'QY'A.:u

usc

rouJ:tdaunn Jtn••n-nn• • Bn•! Er•tr•n-rln.• • ,.,_...J, •olltY

�ving f.·:�r·n•l40 lb.w.!: ,30"drop W.O. 862-00 JULY 1979

'"PLATE A-4

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... ---

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1 1000 __ _ _

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500 1 000 1500

NORMAL PRESSURE P.S�F. ·

LOCATION: Boring No. 1

DEPTH: 15 - 16.5 Feet

DESCRIPTION: Mottled Reddish Brown Clayey Silt

DIRECT SHEAR

... � .

TEST

GEOL.A.l3S- :HA"VV..A.:n: �··ouncta.tion &. sO�l Eng1neei"1�g • G�ology

DATE �LO,

JULY 1979 696-30

PLATE A-5 "

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I 500 1000 1500

NORMAL PRESSURE P.S.F� --��------��----� I DIRECT SHEAR. TEST LOCATION: Boring No. 3

DEPTH: 15 - 16�5 Feet

I D�SCRIPTION: Mottled Reddish Brown. Clayey Silt r�6�6� 30

DATt:. JULY 1979

I PLATE: . A-6 ...

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N<?,RMAL PRESSURE P.S.F.; ',..:.

LOCATION: Boring No. 3

DEPTH: 40 -·41.5 Feet

DESCRIPTION: Brown & Red-Brown Clayey Silt

... -J�·

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DIRECT SHEAR . TEST GEOLA:SS- HA.VV"A.:II

, r·ounc:ta.t10? &. Soil ·Engineering • Gec;>logy . . .

. ·OATE . '}juLY 1979 .

H.O. 696-30

PlATE A-7 "

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