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0 Jerry Kovacs and Associates, Inc. ConsLJlting Geotechnical Engineers

11430 VENTURA BOULEVARD, STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 8n-2757 FAX (818) 980-1524

-FAULT RUPTURE -HA.ZAiui STIJD~

~~t~~W@~ APR 3 O 1998

PROCESSING CENTER LAND DEVELOPMENT

PROPOSED RECONSTRUCTION OF ROYAL OAKSMANOR\ 1763 ROYAL OAKS DRIVE NORTH . -- -·--·· -

DUARTE, CALIFORNIA

FOR

SOUTHERN CALIFORNIA PRESBYTERIAN HOMES

FILE No. 161ss-s ·-N"OViM&iit.10:"i991,. ....... -·

FAULT RUPTURE HAZARD STUDY

PROPOSED RECONSTRUCTION OF ROY AL OAKS MANOR

1763 ROY AL OAKS DRIVE NORTH

DUARTE, CALIFORNIA

INTRODUCTION

Tiris report presents the results of the fault rupture hazard study performed on the subject property.

The purpose of this study was to ascertain. by direct visual observation, the presence, location, and

relative age of movement of any faults situated within the proposed building area. Tl.us work was

commissioned due to the inferred existence of the potentially active Duarte Fault within the proposed

building area.

This investigation included excavation of five trenches, review of available geologic information and

the preparation of this report. The exploratory trench locations are shown on the enclosed Plot Plan.

It is the intent of this report to aid in the design and completion of the proposed project.

Implementation of the advice presented in this report is intended to reduce certain risks associated

with construction projects. The professional opinions and geotechnical advice contained in this

Jerry Kovacs and Associates, Inc. :J!··-~ 11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524 11 l

November 10, 1997 File No. 16158-S Page 2

report are sought because of special skill in engineering and geology. Jerry Kovacs and Associates

has a duty to exercise the ordinary skill and competence of members of the engineering profession.

Those who hire Jerry Kovacs and As~:iciates are not justified in expecting infallibility, but can

expect reasonable care and competence.

PROPOSED DEVEI.OPMENT

Information concerning the proposed development was furnished by the client. The proposed

structures will consist of several residential structures of one to three story Type V construction.

Any changes in the design or location of any structure, as outlined in this report, should be reviewed

by this office. The recommendations contained herein should not be considered valid until reviewed

and modified or reaffirmed subsequent to such review.

SITE CONDITIONS

The property is located at 1763 Royal Oaks Drive North in the City of Duarte, Los Angeles County,

California. At the time of exploration, the site was occupied by several structures associated with

Royal Oaks manor, a multiple family residential facility for seniors. The property ascends gently

to the north from Royal Oaks Drive. Total relief across the site is on the order of 100 feet. Most of

11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524 A Jerry Kovacs and Associates, Inc.


the site ascends at slope gradients generally 10: 1 or flatter. A slope exists in the northwesterly comer

of the site which ascends on the order of 60 feet at gradients as steep as 1-1/2:1.

The neighboring development consists of single family residences on most adjacent properties.

Vegetation consists of trees, shrubs and grasses typical to a well kept multiple family residential

facility. Drainage is by sheetflow along the existing contours southerly to the city streets.

SEISMIC CONDITIONS

The subject property is located in the north-central San Gabriel valley, which is within the south-

central portion of the Transverse Ranges geomorphic province. This geomorphic province is

dominated by east-west trending reverse and thrust faults. The northern portion of the Peninsular

Ranges geomorphic province, located to the south of the site, is dominated by northwest-trending

lateral faults.

The subject property is not located within any earthquake fault zone (Alquist-Priolo Act, 1972).

Active faults within earthquake study zones which are in the vicinity of the subject property include

the Sierra Madre, the Raymond, the Newport-Inglewood, and the San Andreas.

Jerry Kovacs and Associates, Inc.

11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524

November 10, 1997 File No. 16158-S Page4

The Sierra Madre fault zone is located at the southern base of the San Gabriel Mountains. The fault

zone consists of one to five strands forming a complex zone up to one kilometer wide. The strands

or faults dip northerly beneath the mountains and have a reverse sense of slip j uxt::iposing basement

bedrock over alluvium. Four individual segments of the Sierra Madre fault zone have been

identified separated by cusps pointing toward the mountains. Portions of the two western segments,

which extend from the San Fernando Pass to Arroyo Seco, are considered active and have been

zoned earthquake fault zones.

Additionally, the Raymond fault has been zoned an earthquake fault zone. The Raymond fault is

considered an active branch of the Sierra Madre fault zone which diverges out into the valley floor

in front of the San Gabriel Mountains.

The two eastern segments of the Sierra Madre fault zone are considered potentially active and are

not zoned. The subject property is located just south of the easternmost segment of the Sierra Madre

fault zone. This segment extends from Monrovia Canyon east to Big Dalton Canyon in Glendora.

The Duarte fault trends subparallel to the south of this segment and is considered a splay of the

Sierra Madre fault zone. The Duarte fault is described as a reverse fault about 14 kilometers in

length consisting of one to three strands that dip steeply to the northeast. Review of available

geologic maps indicate that the Duarte fault has been approximately mapped trending west-

northwest through the subject property (see Vicinity Map).




The trace of the Duarte fault is not exposed and there is little topographic evidence indicating its

location. The fault is inferred to extend from Santa Anita Canyon to Azusa beneath the alluvium on

the rasis of ground water barriers and geophysical surveys (Crook et al., 1987). The most recent

fault movement along the Duarte fault is thought to have occurred in Pleistocene age (older than

11,000 years ago) alluvium (California Department of Water Resources, 1966). Extensive studies

of aerial photographs and fault trenches have not positively identified either fault scarps or displaced

alluvium younger than late Pleistocene age on the Duarte fault or the faults forming the nearby

segment of the Sierra Madre fault zone (Crook et al., 1987). Crook and others (1987) note that some

subdued scarplike features and ground water barriers in the Duarte-Azusa area could represent

displacements in Holocene (younger than 11,000 years) alluvium, but the evidence is marginal.

Therefore, the Duarte fault, along with the segment of the Sierra Madre fault zone, are considered

potentially active due to the lack of displacement in Holocene deposits.

EXPLORATION

Field reconnaissance of the subject property and surrounding area provided no direct evidence for

the presence of the Duarte fault. No surface features, including lineations or topographic

expressions, were observed indicating the presence of the fault across the subject property.


11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524 ~~\\ ~


A fault trench investigation was performed to establish the presence or absence of the fault and

recency of any fault movement. The fault trenches were oriented at approximately right angles to

the inferred trace of the Duarte fault. The trace of the fault was based on previous studies performed

by Morton (1973), Envicom (1975), Crook et al. (1987), and LeRoy Crandall and Associates (1989).

LeRoy Crandall and Associates conducted a fault trench investigation in 1989 for a skilled

nursing/personal care building in the northern portion of the subject property. That investigation

concluded that faulting was not present within the fault trench. The skilled nursing/personal care

building was subsequently constructed.

The scope of this investigation was based on the preliminary plans provided by the client. The

investigation is limited to the area of the proposed project, as shown on the enclosed Geologic Map.

The fault trenches for this investigation extend at least 50 feet beyond the extreme north and south

limits of the proposed buildings to adequately provide coverage for any faults trending parallel or

subparallel to the inferred Duarte fault. Furthermore, the northern terminus of the fault trenching

was situated to provide coverage of the site from the southern terminus of the fault trench excavated

by LeRoy Crandall and Associates. The locations of the trenches performed by this firm and the

trench by LeRoy Crandall and Associates are shown on the Geologic Map included with this report.

Surface geologic conditions are also shown on the enclosed Geologic Map.


11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604·3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524

November 1 0, 1997 File No. 16158-S Page 7

Fault trenching commenced on September 29, 1997 and was completed on October 13, 1997 with

the aid of a rubber-tire backhoe. The field investigation included the excavation of five trenches

approximately three feet wide with varying )P,ngths. The trenches were offset to avoid existing

critical utilities and maintain a setback from power poles, their deadmen, and existing structures.

Where the trenches were offset, the ends of the trenches were overlapped to provide a continuous

exposure of the earth materials in the trenches.

The trenches provided a continuous exposure of the earth materials for a distance of 67 6 lineal feet.

The depth of the trenches ranged from 8 to 11 feet. The trend of the trenches varied from NlOW to

N21E. Observation and logging of the earth materials exposed in the trenches were performed by

the project geologist. The logs of the trenches are included as Plates 1 through 5. The stations

shown on the trenches logs (0+00 to 6+76) and Geologic map were established by this office in order

to aid in the description of the earth materials encountered. The earth materials excavated from the

trenches were replaced as compacted fill following observation of the trenches.

EARTH MATERIALS

ArilliciaLEill

Artificial fill, associated with past grading for development of the site, was encountered below the

ground surface to a maximum observed depth of 5 feet at Stations 3+30 and 5+73 where buried


11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604-3182 (818) 980-0825 (213) 877-2757 FAX (818) 980-1524 A


utility lines were present. The fill generally ranges from 2 to 4 feet thick. Three distinct units of

fill were observed in the trenches and are noted as af1 , af2 , and a~ in the logs. The fill generally

consists of fine to coarse-grained silty sand, which varies in color from light to dark brown, orange-

brown, and medium to dark grayish brown. The fill was dry to moist, and medium dense to dense.

Varied amounts of scattered pebble and cobble-size granitoid, quartzite, and metavolcanic fragments

were noted in the fill. Occasional concrete and asphaltic concrete fragments were also noted.

A thin layer of residual soil was observed underlying the artificial fill approximately between

Stations 2+00 and 2+ 30 in Trench 3. The soil layer is up to 6 inches thick. The soil consists of

medium to dark brown, fine to coarse-grained silty sand with a clay binder. The soil was dry to

slightly moist and medium dense.

Alluvium

Holocene alluvium underlies the artificial fill and soil. It is informally divided into four units

designated as Qal1, Qal2, Qal3, and Qal4" These designations are based on textural and compositional

differences noted in the alluvial unit and do not imply time-stratigraphic units. The overlying nature


11430 VENTURA BLVD., STUDIO CITY, CALIFORNIA 91604·3182 (818) 980·0825 (213) 877-2757 FAX (818) 980-1524


of the units would tend to indicate relative ages with Qal1 being the youngest unit and Qaj the

oldest. The alluvium was observed to the bottom of the trenches.

The alluvial unit Qal1 consists of interfingering layers of silty sand, sand, and gravel. The fine to

coarse-grained silty sand is light to medium brown and contains some scattered pebbles. The

medium to coarse-grained sand is light brown to light grayish brown and is moderately graded. The

gravel is generally fine with occasional coarse pockets. The silty sand matrix is mottled grayish

brown. This alluvium unit is dry to moist and poorly consolidated. The gravel was prone to caving

where exposed in the fault trench. The observed Qal 1 unit began at about Station 5+ 10 and

continued southward to Station 0+00.

Qal 2 consists of medium brown, light grayish brown, and pale reddish brown, medium to coarse-

grained silty sand, which is moderately to poorly graded. The alluvium unit was observed to be dry

to slightly moist, medium dense, and contain a few scattered pebbles. This alluvial unit was only

observed in Trench 3 from Stations 1 +20 to 2+30. The contact between Qal 1 and Qal2 appears to

be a sharp erosional contact.

Qal3 consists of medium brown to reddish brown, fine to medium-grained clayey to silty sand, which

is slightly moist and dense. Abundant pebbles and cobbles are present in this unit near the north end

of Trench 5 which become scarce towards the south end of Trench 1. The contact between Qal2 and




Qal3 appears to be a sharp erosional contact, as is the contact between Qal1 and Qal3• The Qal3 unit

was observed in the entire length of the trenching.

The oldest unit encountered in the trenches was the alluvial unit Qal4 which is likely Holocene age.

This unit was observed from Stations 6+40 to 6+76 at the north end of Trench 5. Qal4 consists of

light brown to light grayish brown, fine to medium-grained silty sand with a clay binder. This unit

was dry to slightly moist, dense, moderately graded, and contains several scattered pebbles and a few

cobbles. The contact between the Qal3 and Qal4 units appears to be a sharp erosional contact.

Bedrock

Bedrock underlying the site consists of the Duarte Conglomerate of Pliocene(?) age. The bedrock

has been mapped by Morton ( 1973) and Crook et al. ( 1987) across the nose of an ascending ridge

partially located in the north-central portion of the subject property. During construction of the new

skilled nursing/personal care building, a crib-block retaining wall was constructed to support

excavations around the nose of the ascending ridge. No exposures of the Duarte Conglomerate were

observed during field reconnaissance as the crib wall and surrounding landscaping has concealed

them. Also, the Duarte Conglomerate was not observed in the fault trenches.



GEOI .OGIC STRUCTURE


The alluvium described is common to this area of the San Gabriel Mountains. The alluvium is

generally massive to horizontally layered and lacks significant structural planes. The alluvial units

and artificial fill units described above were closely examined to verify continuity of the sediments

exposed in the trenches. Vertical variations in the contact between units were closely examined to

verify the variations were erosional in nature and not offset by the presence of a fault. The lateral

termination of alluvial units and artificial fill units were also examined. Units overlying and or

underlying a laterally terminated unit were examined to determine if they were also terminated or

continued laterally. No faulting, fault related features, disrupted or offset units were observed in the

fault trenches.

CONCLUSIONS

Geologic mapping of the site and surrounding area established no direct geomorphic evidence

indicating the presence of the Duarte Fault along its mapped trace. No surface features or other

evidence were observed which would tend to indicate the presence of the fault across the subject site.

The results of the exploratory trenching indicate that faulting is not present within the 676 lineal foot

exposure of Holocene age deposits. The materials encountered are stratigraphically continuous

.Jerry Kovacs and Associates, Inc.



across the site and are not believed to have been disrupted by faulting. The fault trenches were

excavated beyond the limits of the proposed development in order to insure that the proposed

development was not effected by east-west trending faults.

There has been no direct evidence of Holocene faulting documented on the central portion of the

Sierra Madre Fault Zone, which includes the Duarte Fault (California Division of Mines and

Geology, l 978a, l 978b). The Duarte Fault, mapped in the area of the proposed development is not

currently included in an Alquist-Priolo Special Studies Zone. The California Division of Mines and

Geology in "Fault Evaluation Report, FER69," recommended in 1978 that the central portion of the

Sierra Madre Fault Zone (including the Duarte Fault) not be included in a State of California

designated Alquist-Priolo Special Studies Zone because the fault is not well-defined and there is no

evidence for Holocene faulting.

Based on geologic mapping, trenching and review of geologic data pertinent to the study area and

the Duarte Fault, the possibility of fault surface rupture occurring on-site during the design life of

the structure is considered remote. It is the opinion of this firm, that the site is suitable for the

proposed development from a geologic standpoint.




If conditions encountered during construction appear to differ from those disclosed herein, please

notify this office immediately so the need for modifications may be considered in a timely manner .

. •:·

EFH:nk

Enc: References Vicinity Map Regional Geologic map Geologic Map Plates 1 through 5

xc: ( 10) Addressee

soils\l 6158flt.cfh

Jerry Kovacs and Associate~s, Inc.


REFERENCES

November 11, 1997 File No. 16158-S

Association ciEngineering Geologists Field Trip Guidebook, 1983, "Sierra Madre and Related Fault Zones," Special Publication.

California Department of Water Resources, 1966, "Planned Utilization of Ground Water Basins, San Gabriel Valley," Geohydrology Bulletin 104-2, Appendix A.

California Division of Mines and Geology, 1978a, "Fault Evaluation Report FER-69.11

California Division of Mines and Geology, 1978b, 'Supplement to Fault Evaluation Report FER-69."

California Division of Mines and Geology, 1978c, "Supplement to Fault Evaluation Report FER-69"

Crook, R., Jr., Allen, C.R., Kamb, B., Payne, C.M., and Proctor, R.J., 1987, "Quaternary Geology and Seismic Hazard of the Sierra Madre and Associated Faults Western San Gabriel Mountains," in U.S. Geological Survey Professional Paper 1339, Ch. 2, pp. 27-63.

En vi com Corporation, 1975, "City of Duarte Public Safety and Seismic Safety Element."

Morton, D.M., 1973, "Geology of Parts of the Azusa and Mount Wilson Quadrangles, San Gabriel Mountains, Los Angeles County, California," California Division of Mines and Geology Special Report 105.

Shelton, J.S., 1955, "Glendora Volcanics Rocks, Los Angeles Basin, California," Geological Society of America Bulletin , v. 66, no. 1, pp. 45-90.



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VICINITY MAP

JERRY KOVACS AND ASSOCIATES, INC.

CONSULTING GEOTECHNICAL ENGINEERS

PROJECT: SCPH

FILE NO. 16158-S

REFERENCE: GEOLOGY MAP OF THE AZUSA AHJ MOUNT WILSON

QUADRANGLE~ LA. COUNTY, CALIFORNIA. COMG SPECIAL REPORT 105, PLATE L

REGIONAL GEOLOGIC MAP

JERRY KOVACS AND ASSOCIATES, INC. PROJECT: SCPH

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~~~~~~~~~~~~~~~~~~~~

CONSUL TING GEOTECHNICAL ENGINEERS FILE NO. 16158-S

166775

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NORTH END

595

590

585

580 J

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LEGEND

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REFERENCE:

Qal 1 HOLOCENE ALLUVIUM: INTERFINGERING LAYERS OF SR.TY SAND, SAND, AND GRAVEL (SM, SW, AND GW); SILTY SAND IS FINE TO COARSE GRAINED, LIGHT TO MEDIUM BROWN AND PALE GRAYISH BROWN WITH SOME SCATTERED GRANITOID AND METAVOLCANIC PEBBLES; SAND IS MEDIUM TO COARSE GRAINED, MODERATELY GRADED, LIGHT BROWN TO LIGHT GRAYISH BROWN, GRAVEL IS GENERALLY FINE GRAINED WITH OCCASIONAL COARSE POCKETS, SILTY SAND MATRIX, MOTTLED GRAYISH BROWN; ALLUVIUM IS DRY TO MOIST, POORLY CONSOLIDATED.

.Jerry Kovacs and .Associates Inc. CONSULTING GEOTECHNICAL ENGINEERS

SCALE ---'1~·-:~5' ___ _ REPORT DATE ----DRAWN BY _A=M--"B'-----CONSUL TANT _E_F_H __ _

CLIENT --=S=C:..:...P...:..H.:.._ __ _ ALE NO. 16158 - S

TRENCH 1

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0+30 0 + 20 0 +- 10 O+ 00

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I I I 3• DIAMETER ROOT

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595

590

585

I L 580

PLATE 1

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600

595

590

585

REFERENCE:

STATION

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600

595

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Jerry Kovacs and Associates Inc. CONSUL TING GEOTECHNICAL ENGINEERS

SCALE 1·: 5' DRAWN BY ~A=M"'-'8=--CONSULTANT ~E=F~H-L---

LEGEND

REPORT DATE ___ _ CLIENT ~SC~P:....:H ___ _ ALE NO. 16158 - S

TRENCH 2

ARTIFICIAL FILL: SIL TY SAND (SM), FINE TO COARSE GRAINED, LIGHT TO DARK BROWN, MEDIUM TO DARK GRAYISH BROWN AND PALE ORANGE-BROWN OFTEN MOTTLED, DRY TO MOIST, MEDIUM DENSE TO DENSE, SOME SCATTERED PEBBLE AND COBBLE-SIZE GRANITOID, QUARTZITE AND METAVOLCANIC FRAGMENTS.

Qal 1 HOLOCENE ALLUVIUM: INTERFINGERING LAYERS OF SIL TY SAND, SAND, AND GRAVEL (SM, SW, AND GW); SIL H SAND IS FINE TO COARSE GRAINED, LIGHT TO MEDIUM BROWN AND PALE 3RAYISH BROWN WITH SOME SCATTERED GRANITOID AND METAVOLCANIC PEBBLES; SAND IS MEDIUM TO COARSE GRAINED, MODERATELY GRADED, LIGHT BROWN TO LIGHT GRAYISH BROWN, GRAVEL IS GENERALLY FINE GRA\NED WITH OCCASIONAL COARSE POCKETS, SILTY SAND MATRIX, MOTTLED GHAYISH BROWN; ALLUVIUM IS DRY TO MOIST, POORLY CONSOLIDATED.

Qal 3 HOLOCENE ALLUVIUM: CLAYEY :3AND (SC) TO SILTY SAND (SM), GENERALLY FINE TO MEDIUM GRAINED, MEDIUM BROWN TO REDDISH BROWN, SLIGHTLY MOIST, DENSE, ABUNDANT GRANITOID AND METAVOLCANIC PEBBLES AND COBBLES NEAR NORTH END BECOMING SCARCE TOWARDS SOUTH END OF TRENCH WHERE ALLUVIUM IS STRUCTURELESS.

PLATE 2


Jerry Kovacs 111rid Associates Inc.

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STATION

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DIAMETER 600 CEMENT ROOT COARSE

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585

600

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• Oal 2•

Qal3

PEA GRAVEL/ COARSE SANDY

LENS

1+80

1· DIAMETER

ROOT

0

SCALE: 1 • : 5'

1· DIAMETER ROOT

1+30

N5E IO!Z

1 +. 20

A.C. FRAGMENT 1· DIAMETER ROOTS

o.,, .• . •

•

GRAVEL LENS

. ... ,.,, • •• 0- •••.• ·-

•

N5E < 1+70

SANDY LAYERS

0

--J:;• •

.... ,

Qal 3 -

1+60

CONCRETE FRAGMENTS

'"

5· THICK

ASPHALTIC

CONCRETE

CONSUL TING GEOTECHNICAL ENGINEERS

1 + 10

SCALE 1·: 5' DRAWN BY _A;..._M_B'----CONSUL TANT _,,,E~F.!....!,H __

1+00

N3E

1· DIAMETER ROOT 2· DIAMETER

ROOT

oO 0 ,,.

REPORT DATE ----CLIENT SCPH ALE NO. 16185 - S

tSPHALTIC CONCRETE Fl~AGMENTS

0-+ 90

I 0 ... 86

I

SOUTH ENO

-------.- -~ ...

Qal z

af a

-.

COARSE $ANDY LAYER

l--112· DIAMETER ROOT

5' THICK

1+50

-600

• Qal1

-· . ......

BOTTOM OF TRENCH

..... ,,. . -·-··~ .....

.. .. . •

Qaf 3

1· OIAMEH:R ROOT

ob • • Oo

.·. ·.·. 0

--~ .. ,., -

• 0 •••

·~i::::::z.=:z=.::z::Fc::z::::::z:::kz:=:::;c:=:::;~~LL ___ ~ .. -~--~A._c._-_..._..___......_ af 2

~ ~ 595 z z 0 t== ~ w 590 ...J w

585 REFERENCE:

• • .... -....•. . ····· ....

• • Oal 2 • ... Oal 3

•

..

BOTTOM OF TRENCH

.----•

Oal1 : .. ,.•; : : .·;·. t.

Oal2 •

, ... -

Oala

MEDIUM

GRAlNED SAND

FOR LEGEND SEE PLATE 3.2. 595

590

, 585

TRENCH 3

600

595

590

585

PLATE 3.1

llJ0/15


SCALE: 1 • : 5'

N4E

STATION

605

600

595

590

585

REFERENCE:

NORTH

END

2 +30

c;,

GRAVEL LENS

o·

Qal 1

-

LEGEND

0

2 +()()

I

2· GALV. IRRIGATION

PIPE

Oal 1

SOIL

OOo oo

BOTIOMOF.7

TRENCH

2 + 10

· 4• THICK A.C.

Qal2

aft ARTIFICIAL FILL: SIL TY SAND (SM). FINE TO COARSE GRAINED, LIGHT TO DARK BROWN, MEDIUM TO DARK GRAYISH BROWN AND PALE ORANGE-BROWN, OFTEN MOTTLED, DRY TO MOIST, MEDIUM DENSE TO DENSE, SOME SCATTERED PEBBLE AND COBBLE-SIZE GRANITOID, QUARTZITE AND METAVOLCANIC FRAGMENTS.

8f1. AATIFICIAL FILL: SANDY SILT TO CLAYEY SILT (ML), PALE ORANGE-BROWN, DRY TO SLIGHTLY MOIST, ARM TO STIFF, LOCATED BETWEEN 1+00 AND 1+30.

Jerry Kovacs and Associates Inc.

2 + 00

4·-5· THICK A.C.

0

SANDY LAYER

Oal·3

GRAVEL LENS

CONSUL TING GEOTECHNICAL ENGINEERS

SCALE 1· - 5' REPORT DATE ---CLIENT ~S~C~P_H~---ALE NO. 16158 - S

DRAWN BY _A_M_B __ _ CONSULTANT =E~F~H'----

TRENCH 3

1+90

605

600 SOIL SOIL: SILTY SAND wrrn CLAY BINDER (SM), FINE TO COARSE GRAINED, MEDIUM TO DARK BROWN, DRY TO SLIGHTLY MOIST, MEDIUM DENSE FEW SCATTERD GRANITOID AND METAVOLCANIC PEBBLES, LOCATED BETWEEN 2+00 AND 2+30.

595

590

585

Qal 1 HOLOCENE AL: ... uv1UM: INTERFINGERING LAYERS OF SILTY SAND, SAND, AND GRAVEL (SM, SW, AND GW); SILTY SAND IS FINE TO COARSE GRAINED, LIGHT TO MEDIUM SHOWN AND PALE GRAYISH BROWN WITH SOME SCATTERED GRANITOID Al\D METAVOLCANIC PEBBLES; SAND IS MEDIUM TO COARSE GRAINED, MODERATELY GRADED, LIGHT BROWN TO LIGHT G RAYi SH BROWN, GRAVEL IS GENERALLY FINE GRAINED WITH OCCASIONAL COARSE POCKETS, SIL TY SAND M.ATRIX, MOTILED GRAYISH BROWN; ALLUVIUM IS DRY TO MOIST, POORLY CONSOLIDATED.

Oar 2 HOLOCENE ALLUVIUM: SILTY SAND (SM), MEDIUM TO COARSE GRAINED, MODERATELY TO POORLY GRADED, MEDIUM BROWN, LIGHTGRAYISH BROWN, AND PALE REDDISH BROWN, DRY TO SLIGHTLY MOIST, MEDIUM DENSE, FEW SCATTERED GRANITOID PEBBLES.

Qal a HOLOCENE ALLUVIUM: CLAYEY SAND (SC) TO SIL TY SAND (SM), GENERALLY FINE TO MEDIUM GRAINED, MEDIUM BROWN TO REDDISH BROWN, SLIGHTLY MOIST, DENSE, ABUNDANT GRANITOID AND METAVOLCANIC PEBBLES AND COBBLES NEAR NORTH END BECOMING SCARCE TOWARDS SOUTH END OF TRENCH WHERE ALLUVIUM IS STRUCTURELESS.

PLATE 3.2

oU0/10

605

600

595


SCALE: 1 • : 5'

N5E

2 +80 2 +70 2+60

NORTH

END 3• DIAM. STEEL PIPE FOR TELEPHONE LINES

CONCRETE· FRAGMENT

4· DIAM.

s· THICK ,ASPHALTIC :CONCRETE

PAVING

- -0

Qal 1

COBBLE

Oal 3

EDISON POWER LINE /

ENCASED IN LEAN CONCRETE

LEGEND

STEEL PIPE, CONCRETE SLAB

Qal 3

BOITOMOF / TRENCH

ARTIFICIAL FILL: SIL TY SAND (SM), FINE TO COARSE GRAINED, LIGHT TO DARK BROWN, MEDIUM TO DARK GRAYISH BROWN AND PALE ORANGE-BROWN,

. OFTEN MOTTLED, DRY TO MOIST, MEDIUM DENSE TO DENSE, SOME SCATTERED PEBBLE AND COBBLE-SIZE GRANITOID, QUARTZITE AND METAVOLCANIC FRAGMENTS.

Qal 1 HOLOCENE ALLUVIUM: INTERFINGERING LAYERS OF SILTY SAND, SAND, AND GRAVEL (SM, SW, AND GW); SILTY SAND IS FINE TO COARSE GRAINED, LIGHT TO MEDIUM BROWN AND PALE GRAYISH BROWN WITH SOME SCATTERED GRANITOID AND METAVOLCANIC PEBBLES; SAND IS MEDIUM TO COARSE GRAINED, MODERATELY GRADED, LIGHT BROWN TO LIGHT GRAYISH BROWN, GRAVEL IS GENERALLY FINE GRAINED WITH OCCASIONAL COARSE POCKETS, SILTY SAND MATRIX, MOTTLED GRAYISH BROWN; ALLUVIUM IS DRY TO MOIST, POORLY CONSOLIDATED.

REFERENCE:

5·-r THICK CONCRETE DRAINAGE

SLAB

oO~o

Jerry Kovacs and Associates Inc. CONSUL TING GEOlECHNICAL ENGINEERS

SCALE 1·: 5' ------- REPORT DATE ----DRAWN BY -'A'-"-M=B __ _ CLIENT ___ S.-.C._PLAH ___ _ CONSULTANT -'E~FH......__~ ALE NO. 16185 - S

2 + 40 2 .... 33

1· DIAM .. GALV.

IRRIGATION ? PIPE 605

~THICKA.C. SOUTH END tu

I 600

w u. z z 0

~ Oal 1

GRAVEL LENS

> w ...J w

Oal 3

595

Qal 3

t_ 590

HOLOCENE ALLUVIUM: CLAYEY SAND (SC) TO SIL TY SAND (SM), GENERALLY FINE TO MEDIUM GRAINED, MEDIUM BROWN TO REDDISH BROWN, SLIGHTLY MOIST, DENSE, ABUNDANT GRANITOID AND METAVOLCANIC PEBBLES AND COBBLES NEAR NORTH END BECOMING SCARCE TOWARDS SOUTH END OF TRENCH WHERE ALLUVIUM IS STRUCTURELESS.

TRENCH 4

PLATE 4

188775

~ w LL z z 0

~ > w ....J w

STATION

~ +-50

605

• ..

600

595

4-t-20

• •

C)

0

N1W -<: .

3-+40

TV CABLE

• af •

o' 0

D 0

Oal 1 o•

•

Qal 3

4+10

I 2· DIAM.

s·-s· THICK A.C.

.. •

BOTTOM OF TRENCH


SCALE: 1 • : 5'

Jerry Kovacs and Associates Inc. CONSUL TING GEOTECHNICAL ENGINEERS

SCALE 1·: 5' REPORT DATE ----DRAWNBY -'-"AM==B __ _ CLIENT -'s"""c .... P ...... H....__ __ _ CONSULTANT -=E::.;...F.:..:H'---- ALE NO. 16158 - S

·--·

J: 0 z

N4E

"" TRENCH 5 w -a: CJ)

3+30t-~ ~ Cl'.)

c z w al

24· DIAM.

CONCRETE

3 +20. 3 + 10

I 1· DIAM. 2· & 1-1/2• DIAM.

.. STORM DRAIN ? ROOT GAS LINES

4+00

0

7

.. -Qal 1

I

'--- 2· DIAM. ROOT of'o o

, 0 .. 0 0 •....

--------:..-----~~·~···~-·~~ Qala

3 + 90

6 A I>

3 + 80

' .

SANDY LAYER

3 +00 2 .... 90 2 + 80

I 2 + 79

I SOUTH

605 5·-s· THICK A.C.

ENO

Qa1 1 . GRAVEL LENS 600

Qal 1

Qal 3 595

3+70 3 ..... 60

I , ' •

DECAYED 5• THICK A.C. 2· DIAM._ ROOT

1· DIAM.

tw w LL z z 0 ;::

~ ....J w

605

600

595

REFERENCE:

•

Qal 3

1· DIAM.

ROOT

• • 0

if

•

.. ..

WHITE FIRM POWDERY

CONSTRUCTION

•

. DEBRIS .• .... 0

•

•

" 1· THICK MORTAR

"•• '! LAYER • • ••

NSE <.

. " .. - -· Oal 3

0 • 0

0

..

ROOT 5·-5· THICK A.C. 605

100176

tLJ w LL z z 0

~ > w ~ w

tu w LL z z 0 I-

~ w ...J w

STATION.

4 +90

I 610

4· THICK A.C.

• a ... •

' 605

~ . .... •

4+80

• 0

TRENCH 5 . (EASTWALU

SCALE: 1 • : 5'

4 .... 70

2· DIAM. METAL PIPE

·- ..

4 +60

VOID WITH 4" t DECAYED

ROOT

c>

Qa I 1 -----------· • -. · .... -"' --· • •. 0 . .. .

Qal 3 600 .. :- ···- -· --··

STATION

5 + 60

I . 615

..

610

..• 605

. . .

600

.. af 1 .

•

af 2 .. . ... .• . 1· DIAM.

ROOT ... ...

0 ... - ,.o.-

5 +-50

Qal1 0 •• •

BOITOMOF -TRENCH

.. •

. . - . " "' •.. Qal 3

d .... •

BOTTOM OF ) TRENCH

5 +-40 5 -t- 30

•

FINE GRAVEL

LENS

4• THICK A.C.

... ..

. . . . Qal 3 ·····

. .. .

REFERENCE:

Jerry Kovacs and Associates Inc.

N6E

4 +50

t 3•-t• DIAM. VOIDS

WITH SMALLER ROOT INSIDE I

POSSIBLE ANIMAL UR ROWS

•• .. -. . ... . .. . ~ ...

•

. . ..

< N6E

...

. . ...... .

1· DIAM.

TREE ROOT

CONSULTING GEcJTECHNICAL ENGINEERS

SCALE ~1_._:5~·~~~DRAWN BY ~A~M~B~~CONSULTANT =EF,_,H_,__ __

REPORT DATE ___ _

•

CLIENT SCPH · ALE NO. 16158 - S

4 ..... 40 4 +30 TRENCH 5 I

N5E 4 ~ 20

4· THICK A.C.

1· DIAM. • 605 • R T af 2 1· DIAM. ROOT

----. .. Qal1 • o • . • • . .. , - . . . ...

600 Qala •

.. ~. .. .. . , •• • • • ......

5 ... iu 5 + 00

5" DIAMETER METAL CASING

314• ELECTRICAL .WITH r DIAM. CONDUIT \ IRRIGATION AND

""-... WIRES INSIDE TRENCH

595

4 ... 90

1-1/2• DIAM. TV CABLE

PLASTIC PIPE

•

Qal 1 •

I

610

605

Cal · • QUARTZ ., 3 MONZONITE . . ... ·.

-·· . . .. . -

. GRAVEL LAYER

. ... . . -.

• BOllLDERS •

-- . - Qal 1

600 • .. .. . -......

FOR LEGEND SEE PLATE 5.3 PLATE 5.2

1611775

~

ljj w LL z z 0

~ > w ...J w

STATION

6 -t-30

620

615

4• DIAM. RED CLAY

WEA LINE

. • •

af 1

. ..

6 +20

• • - 0

610 ... - 0 o• . . - • • 0 -• -• . . -. •

•

0

TRENCH 5 (EASTWALU

N21E .......

6 + 10'

4• THICK A.C.

. . . .

. . • . .. 0

Qal1 -

CONCRETE FRAGMENT

- -. . ... • .

-.. ·.- .

. .

6 +00

, 0

:I: (.) z w a: ,.... I- O'l

z + 0 z w cc

()

0 ...

• • C)

5+ 90

8. DIAM. CONCRETE

SEWER? R STORM DRAIN

..

. - ... ---~- ~

Qal1

- ..... 0 - - • - • : -: , ••• ·- • : -· .. ~- .·.

615

STATION

6+76

NORTH END

6 + 70 6 +-60

GRAVEL LAYER

N21E -<

1 • DIAM. METAL IRRIGATION PIPE

~~~:::~~~~"""""""""':=~2·~T:H:IC~K:A:·~C~.~.,:~:: (ABANDONED) l o ._,. 3"THIC:::J ~

\ BOTTOM OE

TRENCH

6-+ 40

Jerry Kovacs and Associates Inc. CONSULTING GEOTECHNICAL ENGINEERS

SCALE 1·: 5' DRAWN BY ____ A_M~B __ _ CO NSU l TA NT ...... E ..... F ...... H.:.,._ __

5 +80

N6E --=-----

REPORT DATE ___ _ CLIENT _;S=C=P:.....:H:...!.-__ _ ALE NO. 16158 - S

5.-10 TRENCH 5

1· DIAM. 5 + 60 1-112· DIAM. ROOTS

4· THICK A.C. PLASTIC PIPE 10· DIAM .

CONCRETE ORM DRAIN CONCRETE

615

·-~ 2·DiAM . •

• af 2 •

•

• METAL PIPE . . . • af,

-. ..

6-+ 30

.. af 2 · 610

• • •

Oal 3 --• • • 0 •• - •• :·. ~ : ~ --- . . .. . -GRAVEL LAYER

LEGEND

FINE COBBLE/ PEBBLE LA YER

-· .. 605

af 1 ARTIFICIAl. FILL: SILTY SAND WITH CLAY BINDER (SM), FINE TO MEDIUM GRAINED, OClANGE·BROWN, SLIGHTLY MOIST, DENSE, SEVERAL SCA TIERED PEBBLE-SIZE GRANITOID FRAGMENTS

Sf 2 ARTIFICIAL FILL: SILTY SAND (SM), FINE TO COARSE GRAINED, LIGHT TO DARK w LL z

610 0 f y~ I ,C a , I ~ -..--L-.---1--=l:::::.:Z:=:iC:::zj

af 2 • 620

BROWN, MFDIUM TO DARK GRAYISH BROWN AND PALE ORANGE-BROWN, OFTEN MOITLED, DRY TO MOIST, MEDIUM DENSE TO DENSE, SOME SCATTERED PEBBLE AND COBBLE-SIZE GRANITOID, QUARTZITE AND METAVOLCJlNIC FRAGMENTS. z

0

~ Gi ...J w

605

610

REFERENCE:

.. •

Qal1 ·- -... Qal4

•

•

•• • ••• • . -· . • • •

BOTTOM OE

TRENCH

•

-.

-• ah •

C'). ... .. . -••• .. • -Qal 3 -. -.. ·- . . ... . ..... -.,. o .••

• af 1 •

af 2 . .... ..

~ • .. • -

Qal 3 • ; .

t::::>

- • . ··-

•

:

• . • . 0 d •

.. -.. •

Qala

615

Oal 4

610

HOLOCENE AUUVIUM: CLAYEY SAND (SC) TO SILTY SAND (SM), GENERALLY FINE TO MEDIUM GRAINED, MEDIUM BROWN TO REDDISH BROWN, SLIGHTLY MOIST, DENSE, ABUNDANT GRANITOID AND METAVOLCANIC PEBBLES AND COBBLES NcAR NORTH END BECOMING SCARCE TOWARDS SOUTH END OF TRENCH WHERE ALLUVIUM IS STRUCTURELESS.

HOLOCENE ALLUVIUM: SILTY SAND WITI-f CLAY BINDER (SM), LIGHT BROWN TO LIGHT GRAYISH BROWN, DRY TO SLIGHTLY MOIST, DENSE, FINE TO MEDIUM GRAINED, MODERATELY GRADED, SEVERAL SCATIERED QUARTZITE AND METAVOLCANIC PEBBLES •

PLATE 5.3

,,. .. ' ;,.:!t"": -.,,;.~ .. ' . . . . . . . -· ,·; {": ... .' •

: ..

·.

...

·,. "; '·

., -. . ··-;

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g ,... __ N

z

TRENCH

0

"'

FILL OVER .,,__ .

ALLUVIU "' z

0 0 ,.. __ .... z

~ ,... __ "' z

. FILL ·r ••

OVER ALLUVIUM

g ·-~-z T 52

T 511

2

T

T

605.5 x

r--t---.;o o. o o·

02.4 x

99.4 x

598.-4 x.

..

2 +81

. 591.6 x

·-A

~ ··. :· ·.--:: .• . ·-- '· .... · .. ·;"· . ~ -

. •. .

,,

596.4 x

625.Z x

0 ·x 595.6

625.• x

\ 6~-6

0

0

()

0

594·.~

' ns :

517.6 x

T 1'0

x 595.9

125.6 • x

T 193

T 1'92 _

o\ 0

617.5 x

&17.IS x

T 123

T ll4.

0

T 58.

·. ·.:;

r\W"°'·~ ..

T 811

l

CD r"' I

' . ,. I .

. I

: ~- - - ~~ - . '5'\i" ;- -

600.l x .

I

~--- - · .

• 620.8. . (. x. ... ~

· ·.:·~· ·· · \...:/" . .

· ..

li16.J x

. : ' · ;- ,!' i ,•1. , •·

,. . ... ·., • - -'. : • • - • • • : •• -.# - - ,. . .

- ,, -_ .·,.·;.: ~· - ~·- ·. · ~-;,,·~-.. . ..... ·· :·.~- ~ ,· ' .:.·;· . ·. - .

612.5 x

•. · .. - . -·

+

.

·-515.5 . x

..

. . .,

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x:_,.....,,,,,,...~:----x · xe----,,,-xc---~x

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0 • • ~~~:;;;;;;;:;;;;;;:;;;;;;;;;;;;;;:;;;;~======:::;;;z====S::~::::=::::::::::=:=:=======:::::::::_~-;'"'""'~~:"';::;;-:-~~~-sgs · X SiS= · •

--_-.--~ . I_, - : ~,·~ , , 1 · _m~~~-.~~-. ~~-~+~~~-.-:~~~· · ,~--- --~-l-.~~~ ... ~~~~~.4. ~-·~·~·-,4.,-.~-~=· ~-:-~~.~-~~.~. -.-~.-.:-.~~-~~~~·~;-. -: .~. -~~-.~. -. 4-~.~~~. -.-.~- ~----.-. ~~---. ~. -+_-.-~~=~ EJJOO. ·' .\:~'., . • : ' ··; . . . E3'4-50. ._ <' . ' , _E _ ~r;o.·:" '. .• ,. -;: ·::. - .~ '::~·,'.' ·.-··: : <·:~: -·E:-?750 ..... ' ; ·:. ::··-'. . .. .EJ900. ;: . .-· <:· . . . .

• ' . . ... ·_:.. .. ,. ·- ": -~ -.. ··_ .-._._-. •' ~ -. . . :~_. \·:··:~,~~~~ · .. . ...... ·'.:'~ ;~ - -·~ : ·~ -~~~~~~~~-: ;·;:. ·:· :·_ .; ' ' · ·:~~~ ~~:~ :_·. _ - ~ _:: _-~:·. , .··:~ :< . t .- •· · ~ ·' .. ..

5. REMOYE AIL EXISTING llATtRIALS AND S'!SlEMS R£QUIREO fOR . ·• •· CONSlRUCTICIN CF NEW YOll( M!Ellfll OR NOT SPEOACAl.l.Y SHO'llll

6.

1.

a.

9.

10.

OR INOICAlED. · . • •

R£ITR TO SIRUCTIJRAI.. llEOiANICA(. PUJMBlllG, FIRE Pil01ECTION. AND ElfClRICAL DRAWINt;S FOR .llllllllONAL DEMOUTION llEOUIREMENTS.

AIL S.ll VACEABti ITEMS SlW.l. ll( REUseD AS illOICA IDl, 0£Ul'ER£D TO M or.NER AS INOICA 1ED Oil REMO'<m AQi lHE SIJE BY 11£ CONTRACTOR. .

ANY EIOSTING WALL. A.OCR OR CEIUNG SURf'AC( MOONlEO MEDIC.ti.. EOOIPMENT NOT PR£'110USlY REMOl'EO BY ll!E O'M<ER, INCi.WiNG CURT A1H TRACl(S IN !lEIUNGS SOIEDIJLEl) FOR OEMO!JllON, SIWJ. BE S.11.VACED AND DEU'.{Rf!) TO 11£ OY1NER FOR REUSE. OR STCRACI: AS DIRECTED. . .

MAINTIJN" All llEOIANICAL," El.£CTRICAI. AND f'l.\llll!ING 5Eirna:s TO All OCCUPIED AREAS AT AIL 11MES DUllllC CONSlRUCllOH.

CUT AND CAP ALL ABANOO'IED PUJll9NG ANO ELECTRICAL L.1j£S' BEHIND WAI.LS, ~'fr CEL/NGS OR eaow nOORS. COCIROINAlE Willi ALL REQUIREMENTS SHOllN ON PWllBl!IG ANO aEClRICAL DRAWINGS.

11. REMOVE ALL OIS11NG GDUNGS. WAU ANO flOOI! llATtRill;..'.i REWIRED FOR 11£ .INSTAU.A TICIN OF: NE• wqR1C INOICA lEO.

12. PROlECT ALL ElllSTlNG. DOORS, WINDOWS 000 CLAZING.

1.t PREPARE WAUS FOR REPAIR ilHeR£ INlERSECilHG PERPENDICUJiR WALLS ARE REMOVED.

14, lffRE REOU!REO AT EXISTING WALLS TO RDIAIN, REMOVE EIOSTING ANIS!i WA TERIALS ANO Cll'SUM BOARD FR011 ONE OR BOlli SlllES AS REOUIREO TO llST ALL El..ECTRICN.. OR l't.UUBING wtllK OR BACKING FOR AHOIORING CF CASEWORK.

15. CUT AND RE\:0'11: PORTIIJI Of WALLS AS R£0U!RED FllR INSTALLATION Of N(W OPENINGS.

I 5. REMO\£ EXISTING WiYL WALL COl{RINC AS REOUJ!lED FOR INSTALLATION Of NEW WALL CO\'ERING IN ALL AREAS· INOICA1ED TO RECEJ\IE NEW.

17. llEMO\IE EIOSTING SICNACE IN DEMOLITION AREAS UNLESS N01ED OTHERWISE-SALVAGE FOR REJNSTAl.J.ATION AS OIREClED BY OllNER.

18. REf!R TO Cl'lll ENGINEERING ORAlllNGS rOil ADOTIONAL INFCIUIA TION.

SITE KEYNOTES

This legend lists items used throughout the project drawings. Not ell i.tems listed ore indicated on every drawing sheet.

Q)

® Q)

©

EDGE Of PARKING. STRUCTURE

REMOVE EIOSTING. CUZINC ANO FRAME.

].~\,~T 0£MOUTION NOTES: . . R<\ln\t EXi$TI~y TILE FLOOR AND Flll W/ MORTAR AT ANT

PLOT PLAN

LEGEND

B9Q LOCATION AND NUMBER OF,BORNl

TP5 H LOCATDN AN> MJMBER OF TEST PfT

0 lerrf1 Ko.,aes

NO le FOR F~T TRENCHES SEE

AEPORT, DATED 11/10/97.

~- -- - - -~ :---- -- -E-----3

KEYPLAN

LEGEND

and Associate lne.

SCPH

11/10/97

12/23187

FLE No.· 16158-S

.. -. . -.·

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DATE ISSUED · July 10, 199"

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~~t~~w@~ - californiagmw.consrv.ca.gov/shp/apsi_siteinvestigation... · 11/10/1997 · those who...

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tw@~ - californiagmw.consrv.ca.gov/shp/apsi_siteinvestigation... · 11/10/1997 · those who...