. '

,

(

RICHARD MILLS ASSOCIATES, INC.

9624 Turner Avenue

Rancho Cucamonga, California 91730

(714) 989-1751

ENGINEERING GEOLOGIC INVESTIGATION

Proposed Residential Tract

Etiwanda Avenue at 24th Street

Rancho Cucamonga, California

for

WAYNE D. BLANTON

C/0 Newton Realty

1297 North Towne Avenue

Pomona, California 91767

September 9, 1983

83-225

INTRODUCTION

RICHARD MILLS ASSOCIATES, INC.

9624 Turner Avenue

Rancho Cucamonga, California 91730

An engineering geologic investigation was conducted for

the proposed residential tract located on Etiwanda Avenue at

24th Street in the City of Rancho Cucamonga, California

during July 1983. The purpose of the investigation was to

determine if the Red Hill fault, as mapped on the California

State Special Studies Zone Map, Cucamonga Peak Quadrangle

extends into the tract area. our investigation consisted of

excavating 983 lineal feet of trench perpendicular to the

projection of the mapped fault trace, detailed logging of the

exposed excavation, literature rese~rch, stereoscopic

examination of aerial photos of the area, analysis of the

data obtained in the research and exp_'.oratory phases and

preparation of this report.

The recommendations and conclusions presented in this

report have been prepared in accordance with generally

accepted engineering geologic principals and practices. This

warranty is in lieu of any other warranty either expressed or

implied.

LOCATION AND ACCESS

The site is located on the west side of Etiwanda Avenue

south of 24th Street in the City of Rancho Cucamonga,

California. Access is obtained from the unpaved extension of

24th Street west onto the site. Irregular in shape, the

1

.. -. ·-' ·-' RIC(-JARD MILLS ASSOCIATt;S

.. approximately 63 acre site occupies the northeast portion of

Section 29 TlN R6W, and is currently vacant. The site is

bounded by 24th Street on the north, by Etiwanda Avenue on

the east, by vacant land and a water reservoir on the south,

and by an unpaved road on the west.

GENERAL SITE CONDITIONS

The site lies in an area of south sloping, coalescing

alluvial fans emanating from Day Canyon and East Etiwanda

Canyon. Regional topography slopes southerly at

approximately 7 percent. Vegetation consists of a dense

cover of chamise and sage. A Metropolitan Water District

water main parallels the northern boundary of the site. At

the time of our investigation, the site was vacant. No other

significant surface features were.noted.

GEOLOGY

GEOLOGIC SETTING

The site lies in an alluvial area along the foothills of

the San Gabriel Mountains. Deposition has been from Day

Canyon on the northwest and East Etiwanda Canyon on the

northeast. The alluvium is generally coarse with an

abundance of subrounded clasts consisting of pebbly gravel

lenses with cobbles and boulders.

Structurally the area is dominated by the Cucamonga

fault. The Cucamonga fault is a low angle reverse or thrust

fault that forms the southern front of the San Gabriel

Mountains and normally separates the basement complex igneous

and metamorphic rocks exposed in the mountains from the

alluvial fan deposits that emanate from the mountain range.

The Cucamonga fault is considered potentially active and has

2

a State established Special Studies Zone along its mapped

trace. Adjacent to and encroaching onto the property is the

State Established Special Studies Zone for the Red Hill

fault. The Red Hill fault has a mapped trace located 800

feet northeast of the site. The state zone established for

this portion of the fault has been extended south to the

southern edge of Redhill near Foothill and Grove Avenues by

the City of Rancho Cucamonga. The Red Hill fault is

postulated to be a branch of the Cucamonga fault. The Red

Hill fault's main surface expression is a small scarp in the

recent alluvium northeast of the site. Its southwest

extension towards Red Hill and through the site, is inferred

by a ground water barrier. Regionally the area is bounded on

the east by the San Jacinto fault, on the west by the Puente

and San Jose Hills, on the south by the Santa Ana Mountains,

and on the north by the Cucamonga fault.

Ground water was not encountered during our

investigation. Our research indicates that ground water lies

approximately 200 feet below the existing ground surface.

(Seismic and Public Safety Element B :ickground Report San

Bernardino County Map 10).

EARTH MATERIALS

The site is underlain by crudely bedded, coarse grained

alluvial sands and gravel with varying quantities of cobbles

and boulders. These materials are covered with a shallow

soil cover consisting of a dark brown silty sand with

scattered concentrations of gravels and cobbles. These

sediments are of Quaternary Age and are estimated to extend

1000 feet to the underlying basement complex. (Seismic and

Public Safety Element Background Report Map 9). The general

petrology of the sediment clasts are hornblend shists, quartz

diorites, biotite gneiss, mica shists and dacite phorphyry.

3

RICf.JARD MILLS ASSOCIATi:;:S

.i

I '· 'I ,, .,

I !1 ..

These rnaterials are basically granular and non-expansive.

They are not expected to cause unusual foundation problems;

however, site grading will generate unknown quantities of

oversize materials. Oversize materials should be placed in

accordance with recommendations provided by the soils

engineer.

SEISMICITY

The site lies. within the Chino Basin portion of the

upper Santa Ana River drainage area at an elevation of

approximately 1680 feet, The Chino Basin is a vast area of

alluvial material some 25 miles long and up to 15 miles wide.

Seismically, the Chino Basin area has been relatively active

with rnany events of rnagnitudes up to 4 and 5 having been

recorded on the surrounding faults. Strong earthquakes

which have affected the Chino Basin area during historical

tirnes include:

1899 - Cajon Pass area, Intensi".:y VIII

1857 - Fort Tejon, Intensity VI[! - magnitude estimated

at 8.3

1918 - Riverside County, San Jacinto-Hemet area,

Intensity IX - rnagnitude 6.8

1923 - East of Riverside - magnitude 6.3

1933 - Long Beach - magnitude 6.3

1947 - Manix Barstow area - magnitude

1948 - Desert Hot Springs - magnitude

1952 - Wheeler Ridge Bakersfield area

1971 - San Fernando - magnitude 6.6

1979 - Imperial Valley - magnitude 6.6

See Plate 3

4

6.4

6.5

- magnitude 7.7

... ~

CONCLUSIONS ANO RECOMMENDATIONS

The site lies partially within the State and City of

Rancho Cucamonga Established Special Studies Zone for the Red

Rill fault. A total of 983 lineal feet of trenching was

performed at essentially right angles to the projection of

the mapped fault. This included 822 feet in the main trench

and two short paralleling trenches for supplemental data.

The subsurface excavations encountered no surface rupture or

offset deposits due to the Red Rill fault. The trenches

revealed essentially 3 mappable stratigraphic units. These

uni ts were distinguished according to their color, grain

size, firmness and frequency and quality of bedding as noted

on the .trench logs. Layered bedding is present in the form

of planar pebble and sand lenses. Individual layers are

commonly continuous over distances of 25 feet. Where

individual layers or lenses are not continuous, continuity of

bedding is shown by unaltered stratJgraphic contacts.

The alluvial materials show bo 'h gradational and sharp

contacts and localized unconformi ties. Our detailed

examination of the materials exposed in the trench

excavations revealed no fault features such as shears,

slickensides, offset layers or anomalous zones.

Consequently, it is our professional opinion that

restrictions on construction based on surface rupture due to

on-site faulting is unwar.ranted at this site. However, the

site does lie in an area considered to be seismically active.

Strong shaking from earthquakes generated on any one of the

several known faults indicated on Table One, should be

anticipated. Therefore, all structures should be designed

according to all seismic requirements of the Uniform Building

Code and the City of Rancho Cucamonga Department of Building

and Safety,

5

RIC(-JARD MILLS ASSCCIATt;;S

. , . '

For more stringent solutions

Seismic and Public Safety Element

the San Bernardino County

Report has provided basic

data concerning faults affecting the area (see

Chart D-2 for maximum credible and maximum

earthquakes).

the attached

probable

The maximum credible rock accelerations to be expected

at any given point in the valley area are also summarized in

the Seismic Element Report (Map 7). This indicates the

following maximum credible rock accelerations for the site.

Fault Max. Credible Acceleration

San Andreas

San Jacinto

Cucamonga

Chino-Elsinore

0.45 g

0.45 g

0.66 g

0.28 g

Based on this data and our research and field

investigation, suggested site parameters are as follows:

Soil Depth = 500 feet*

Soil Type - Dense sand, gravel, and cobble deposits,

bedding poorly defined, discontinuous or

absent.

Depth to Water Table = 200 feet.

Distance to causative fault = 1.2 miles

Maximum probable magnitude ~ 6.5

Maximum Credible Rock Acceleration at Site = 0.66 g

Duration of Strong Shaking = 18 seconds

*Maximum depth suggested by San Bernardino County

Seismic Element Report.

6

RIO-IAf"IJ MILLS t>.S""",...'-\Tl::S

Ground water is estimated to lie approximately 200 feet

below the existing ground surface. Therefore, seismically

induced liquefaction is not considered to be a hazard at the

site.

The site does not lie below or adjacent to any large

bodies of water. Therefore, tsunamis, seisches or other

forms of seismically induced flooding is not considered a

hazard.

Earthquake induced differential settlement is not

expected because the underlying soils are generally massive,

compact, granular materials with low potential for

consolidation during short term cyclic loading.

Based on our research and field investigation, the site

appears suitable for development from an engineering geologic

standpoint.

7

Respectfully submitted,

RICHARD MILLS ASSOCIATES

;<::£~~/Pr Kelvin L. Kau

Q~logs•

Richard B.

President

CEG tll4

RICf.-lARD MILLS ASSOCIAT!;S

\ ; ..

TABLE ONE

List of Active Faults within 100 kilometers

Redhill (Etiwanda)

Cucamonga

Whittier/Elsinore

San Andreas

San Jacinto

Newport-Inglewood

Sierra Madre

San Fernando

Raymond

Santa Susana

Northridge Hills

Hellendale

Lenwood/Lockhart

Camp Rock-Emerson

Johnson Valley

Old Woman Springs

Pinto Mountain

Mission Creek

Banning

Casa Loma

Aqua Caliente

Harper Fault

Moran go

Cleghorn

8

RIC~ARn MIL.LS Assnr1~~r:-s

\

Limits ot State Eetablls~ed Spaolal Studies Zone

• • •

ProJaoted Trac• of ot Rad Hiii Fault

Indicates Location of Trench

PLOT PLAN scale 1":400'

Richard Mills Associates, Inc.

.... w

r l I

• I I ! :

- .. -. -·-··- ..... ·-· -·-· ·-. ----·.' ' ' ' ' : I .. :----

: : / ·-·-""1··--t--T•&&TT-11•"

' I ' . '

"i""·---~;.~--- -···1 t==*==4)='1'="" ; ~ . I . . .

' ••••••t••••• "T"

I

·····-!-·--·

I ~ --r--·~

----t----1 0.1

0.1

T-i.--~-~----~--- • 1

1--- ~--:---

• ••"II_-· ,,;.

II , I

. I ...... i ·---···-· l---····---

1 I ___ L_ __ ... .I ........ -

.. .. ..

I

-· /

1:

; I T------~-t·-· .. ••TT

l ' l ' j \ ! -!( ---·--··[-------· u I

'

I•.,

' : .• ..

. -· --··-·-~:~~~ I

I .,J.·

• : ""!

' "',. '•!) l

. -... ·= ( :1 '···· ••• '.: . I I r-: ~~h-~

1-.-91.q : ".,(

t f :

. I /1'iooi ' v -- ....... j .......... + ..... ----· ....... ~ .. .. ' ' . I

Qol

RICHARD MILLS ASSOC.

1

•

i

' ..

'•

:.•, • • "

'c.\\'I

. '· ' IJ .. ; • .. "

I ·j

"''

o' I I

' ' _. J'_ .... r r

•· ' " .

• ... • •

' "' .. ··-~-~--

I ,. '" . . •••···-.,~-.~o-::~.:!' . .,

:~~-lL~--~~~----· ~· •. 1

•

Alqulst Priolo Spacial Studies Zone•

Cucamonga Peak Quadrangle

1979

Plate 2 83-225-01

•. ... .. ··.

S111r;IJ 81Jf"1Hua I. ! 'ii '

I I

·•· ... ~·"'" •.• · Cdldlhta

• • /,j./tJtlll

···· ....

• ·.iJ ·-" -

"~ SP~

"' ' - •

4t.i~-~·-,·~"1<1.

t' I:• S \ ''j" 1 189~\ .. ~ MAJOR EARTHQUAKES AND RECENTLY ACTIVE FAULTS

IN THE 501:-JTH~RN CALIFORNIA REGION

EXPLANATION' · ACTIVE FAULTS

1899 IA 7+

Total length of fault zone that breaks Holoc_ene deposits or that hos hod seismic activity

Faull segment w1lh surface rupture during an historic earthquake, or with oseismic fault creep.

<> Holocene volcanic activity . ( Ambov. Pisgah, Cerro Prieto and Snllnn Rutte' I

M7.7 19~20

EARTHQUAKE LOCATIONS

Appro•imole ep1cenlrol oreo of eorlhquokes.lhat occurred 1769-1933. Magnitudes nol recorded by instruments prior lo 1906 were esl1moled from. domaqe r<>pons assigned an Intensity VII . (Modified Mercoli scale) or greater; this 1s roughly equivalent lo Richter M 6.0. 31 moderate•· earthquakes, 7 major and one greul earl hquoke ( 1857) were reported in the 164-year period 1769-1933.

Earthquake epicenters since 1933, plotted from improved instruments. 29 moderate .. and three major earthquakes were recorded in the 40-veor nprinrl jQ~~ ~1077 .

REFERENCES

1. California Dept. of Water Resources, 1970, Meeting water

demands in the Chino-Riverside area - Appendix A: water

supply: California Dept. of Water Resources Bull. No.

104-3, 108 p., 20 pls.

2. City of Rancho Cucamonga General Plan 1980, Figure 11-3

•Geotechnical Ha2aras•.

3. Duthcer, L.C. and Garrett, A.A., 1963, Geologic and

Hydrologic Features of the San Bernardino area.

4. Geology Seismicity and Environmental Impact 1973,

Special Publication Assoc. of Engr. Geologists.

5. Hadley, David and Combs, JamEs, 1974, Microearthquake

distribution and mechanisms of faulting in the

Fontana-San Bernardino area '"f Southern California:

Seismological Soc. Amer. Bull. 64, no. 5, P. 1477-1499.

6. Hileman, J.A., Allen C.R., and Nordquist, J.M., 1974,

Seismicity of the Southern

1932 to 31 December 1972:

California region, 1 January

Seismological Laboratory,

California Institute of Technology, Pasadena,

California, 404 p.

7. Morton, D.M., 1976, Geologic Map of the Cucamonga fault

2one between San Antonio Canyon and Cajon Creek, San

Gabriel Mountains, Southern California: U.S.G.S.

Open-File Rpt. 76-726.

9

RIC(-JARD MILLS ASSOCIAT~S

(. (

8. Richard Mills Associates, 1979, Engineering Geologic

Investigation, 453 acre site, north of Etiwanda, File

No. S-306.

9. Richard Mills Associates, 1981, Fault Investigation,

16th Street Project, Baseline and Campus, Rancho

Cucamonga, California, File No. S-345.

10. Richard Mills Associates, 1982, Engineering Geologic

Investigation, Tract Number 10210, Sapphire and Almond, ' San Bernardino County, California. File No. 82-251.

11. Richard Mills Associates, 1981, Engineering Geologic

Investigation, 5 million gallon water tank, Cucamonga

Wash north of 26th Street. File No. V-317.

12. Richard Mills Associates, 19'11, Seismic Exposut'e and

Fault Investigation, Tract N• :mber 11350, Turner and

Baseline, Rancho Cucamonga, C<.lifornia. File No. T-75.

13. San Bernardino County, California, 1974, Public Safety

Element (Seismic Safety Section).

14. Smith, D.P., 1978, Fault scarp map of the Cucamonga

fault zone. Unpublished map, C.D.M.G. Fault Evaluation

Report FER-39.

15. State of California · Special Studies Zones, Cucamonga

Peak Quadrangle, Jan. 1, 1979.

10

RICl-i'"'D" M!I_' '"" 'SSOCIAT!;S

Special Report 113, Geologic Hazards

f~uthwestern San Bernardino County, California, 1976. ,r·

NO.

GS-VBNF

1-21-78

Aerial Photographs Used

Photos used

1-234

1-235

1-236

155

156

157

11

source

Cal Poly

Pomona

County of

Coverage

Excellent

Excellent

San Bernardino

RIC~ARD MILLS ASSOCIAT!;S

~ : 9 M

. -~:. - - ;.; - .. ·

0

62

..

0 0

•

0

• o o • •

0 0

channa1 dep alt --- ... ........ ....... O ,s.-......._ ~ ._ - c- ..-... --~o ... ~:·. o. o -,, - - --.-... ---;-- '....__• • • 0 • 0 = 0 • = 0 ~ ~ ~ • • • •• • • .. .. _,. •..• ., ' /. • • -:---: .... ~ - 0 '

brn silty ovl w/cobbl•:.- ,__. o ". • o •••• o. ., •• "/ • " ______..___ - - ---- .. o ----~ -- l '-

-C).0-.~. o. a· ffiO,., '...:·· •.• o.·;· ...

0 0

,·

0

bbleae"" '1 ~

"62

• 0 ••

0 0 0

c::::::. 0 0

o·"

'-" ._ o • brn •HI y ovl w co ~·.·· = ~ • o~, ' 0 o----·-=-o • - - , -~ "- '~--· 0 00 '-.._) """-...). _r-;:::: r--... 0 0 0

0 " 0'---J 0 0 "~ c::>

tan sandy ovl w/cob!>lu

c::::,

brn a Illy ovl w /cobbles /-

S28E

TRENCH

130

• • • •

1

' ~·-······ !

~

• 5' SCALE 1 APPRO'h'EDBY

REVISED

DRAWN BY KK

DATE 8-29-:-8-3 Prepared By:

Richard ASSQC, Mms

R~alty

.··L

i ;

I

S28E I

i I ' I

' 190 j . ; .

•

S 2 S_i::_E_ -=----- ----190 /

;

/ /

' ; /

I 252 i I

I

• • • • .

-

TRENCH 1

APPROVED BY

t~S~CA~L;E~~1~·~~5~·~~-=-=--=~~:--~~~~~~~~~~~R~E~~V~IS~E~~D~~~~R-OATE 8-29-83

d By: Assoc. -Prepere Richard Mills DRAWING NUMBER

83-225

DRAWN BY KK

Prepared F01~ewton Realty

. ·,

·. .

1 .,_ .....

•

320

.·

.... ~ ;p ~

:.~.· .. • S25E

0

0

0

0

S25E - -- . ---=-=--=-·--

bf n s i It Y gr a. v e I w I cob b I es

• • 0 0 .(J ...

# 0 c:::::::, •• o°'., .. ;, ...

--~---

380 C'

0 0 0

~"o

--- -- - -... 7!'):9

bu ff a andy gv I w/ cohblea&bou,de-re.

TRENCH 1

1· 5' APPROVE~BY

i SCALE

DA.TE 8-2 9 83 i '

Prepued Br:Richard Mills Assoc.

Prepued Far: Newton Realty

I

I

J

320

0 " 00 v • c,, •

'

DRAWN BY WS

REVISED

DRAWING NUMBER

83-225

~ 0 u

-. ~

.

0

Oo ~

~ooS:_°J?8.,~~0

460

--o~

o c:::f:ti 0 -0

0

0

0

0

0 6

0 0 D o D 0

D

1'Mit MO. 1Ol41

0 _!l•rk brn !l!!!' =

0 -o_,

0 --

0 0 0

0

---

0

·~· S25E

. .

0 ' o., 0 .. 0 0 0 . <> <> 0 0 :.... g . .,.--...._ ---..

0 0

b

0

om" oend w/pAblee_;;;.-.__. o - a - '--' o O o _ ~o- o rn • e o- ., .- ,...-...

o ,..--, ~ ...._ 0 -'!:... -='Oo - ::: ~ . .._, ~ ~ _c:: ,__, _-..?. ~ 0 c ~ •

- . -CC:. - rJ>o channel deposit 0 "'c~

460

_--...._ __,. 0 0 ~ o ......- o o e c •1:1io o '"'b 0 0 Q D 0 0 ------ . -Q -· -._ . - ":;,/ ~ =-:_o • ..!..-- "'-!.,

-....._ ~ CJ -· O,p 0 - • 0.-' C=> c:::>

-~3S~2~5~E=--~-------~-- --·

M 5' SCALE 1

D.t.TE 8-29~83 Pttipued By:

TRENCH

.t.PPROVED BY

-

Richard Mills Assoc.

d For: I Prepu• :Newton Rea ty

530

Cl 0 0 0

1

DRAWN SY ws REVi$ED

DRAWING NUMBER

83-225

·~ ~-

. ~~

';f ~-.

;:

.. ~ ..

! , ! • ·* f • "

" 1:: ...

' i . ' ' ' ! • I

'" 'i:

~-,.

~ ~ > ~

0 j

~ ~

w j

" " j

!

590

~-:--~ .... _.

530 S25E

590

o e p o-e. H ion a. I Cont ia ct

I

S25E I 11

t1 brn p-oQrly sor1 ed cobbttJe

I w/aa n d m~trix ( w eathereid ctaets)

TRENCH 1

SCALE 1· 5' APPROVED BY DRAWN BY WS

DATE 8 29-83 REVJSED

Prepu ed By:

! '""'"' '"Newtoo Realty IL_~~~~~~11-~_L_~~~~ ITOCIC CRAFTING f"ORM NO. 1 Ql -41

DRAWING NUMB.

83-225

Richard Mills Assoc.

-~.

-.i-

-

--

-

-

•

B25E

00~ ,,00 C) Q Oo

Oo

buff aandr gvl w/co>bbles

()0 0

0 0 oO a 0 D

730 S 2 5 E _ -----c~---

t"'"._~ .. o.-o - -o-"-'. • _::,, • '""'lfi ~""""··-"••• • ••• -;o-::_ ; • : -~-·-:::..:.\'--. • ; -- .- "Q ·. -~ -.o·~ "'- ··-· : ~ . ,_~-ti -<>-- • -- - ~ • - ~ ..:· • o~ •o cA 0 D 0 0 Ooo 0 CJ D" -"'--- oo- -;p -;-0 C0r-o---- -~-- --;:::--; [}J 0 o o ~ - ~ - . '-"o oo 0 o o -- -o ~ o o o o ----a a o ~o 0 o:;x~ o Vo o - - ---0 o o aoned cobbles In slit m.irti;...,__ Gt, a ..V --.._ -- ~ ~ ---.. Q - -1--... - ... c::> -;;;;;;; _ _ o__ o poorly _ _ _ O <--u - "'* ~ ,,_:;;;> -

,--._ Qoo w ~ -- - S>" a <;::,a() cobble •llqnment

'---' C) - o C) o C)o ,,,,--0 O(jO o •o o o~o o

0 0

-.. • o ;:1., O"o r-. o o oo o o <> ···~ o o " o '-'o

Cl Oo 0

• 5' SCALI! 1

DATE 8-29-83 -

0 0

TRENCH

A.PPROVED BY

Pfepare<t Br: A •oc -- Richard MlHS' s.. •

-~

0

1

730

822

DRAWN BY W$

REVISED

DRAWING NUMBER

• u

w > • 9 w ;;:

a

; .

70

Do ·o •

pebble 1•11•

0

•Illy qv 1 w / c obbleo

0 - - - -t 8 n 8 8 n d y g v 1 w J cobbles

60-.e 0 . 0 0 . cobble: &11-pnm ent

S30E

dark br n a II t Y iv I w I e ~ b bf es

O• • 0 o"

o .. -..

100

S30E

c:::J •o -•

0 0·

-•.o

~ 0

70

C>

0

• C>' o. :.-·--~ -- .,.._ - - 0 ~ oO ......... -o"""Clo: ...... ;'r'T .. --- _..._,. - o-o - 0 00 °

0

0 a C" :;,. ~ -:....C., • •C:o:;:,._'? .'• 9 <>"Q"' o .2:"'• Cl<::. C> 0 e> "' o ti 0 0

o

0

oo · . -.... ~·.: ..... :.:o• 0 CJ o= o 0 0 <> "0° .,o

0 · 0 · . ~oo o o ~ ~ ..$?._oo oa,,...:z_p_ · ·o a - o. - -- c:::) ~ ~ _;., Q 0 O 0 'o C.. o~o

o~ o ~ o oo --

TRENCH 2

1 o••W,NO """""

§ ~

I

REVISED

DRAWN BY W$ APP ROVED BY 1• 5' SCALE

DATE 8-29-83

Prepued Sy: M·ills Assoc. Richard

Sl'OCKDRMTING FORM HO. 101 ... l

,

S28E

0 70

~ .. brn allty ••nd wipe~ _ 0 0

-~ -; \ • • ) \ ~ :...-- ~·--...;. -~ ·-

TRENCH 3

SCALE 1 • 5' AP-PROVED BY DRAWN SY W$

DATE 8-29-83 REVISED

Prepared By: A Richard Mills ssoc.

DRAWING NUMBER

83-225