LADM-NO 1130-2-20 Santa Fe Dam FCB OM Manual 07-1963.pdf

LOS ANGELES COUNTY DRAINAGE AREA, CALIFORNIA

OPERATION AND MAINTENANCE MANUAL

| ,/t t ;". .t' ' .1.

f / ' t u ; " i ,? UL/r*- ;

FOR

SANTA FE

S A N G A B R I E L R I V E R

U . S . A R M Y

?'b7- s4 m

LADM NO. I t30-2-20

DAM

IMPROVEMENT

l i '

E N G I N E E R

C O R P S O F

J U L Y

DISTR ICT, LOS

E N G I N E E R S r 96 3

A N G E L E S

U, S, AltliY m G W m QISTRICT, U S APaGELES, AUGUST 1963

F O R E W O R D

1, This r0aaua.l prescribes standard procedures for the operation and maintenance of tine federally constructed Santa Fe Dam and Flood- Control Reservoir, Los Angeles County Drainage Area, California. All previously issued operation and maintenance manuals for this dam are superseded by this mnual.

2, The Dams Section, Design Branch, Engineering Mvision, 5.8 responsible for the preparation of this manual and for keeping this m m a l up-to-date, Suggested revisions should be f oxwarded through channels, to that section.

FOR THZ DISTRICT EXGINEJB:

$ELTON B. BILES

Major, Corps of Engineera Assistant District Engineer

TABLE

SECTION 1 . INTRODUCTION

Authwi~ation ...............................~.~~~.~~~~~~.~.

P T o ~ ~ c ~ l ~ c a t i o n ~ . . ~ Foundation of Santa Fe D m s i t e Description of project

.................. a . Principal structures and ewpmenf.

b. ~rdrogmphfc insteLIlatio1~8 . r e . O O e * * a e e e * e e e o e e a

C. Communication facflities Protection provided Basic design reports Construction histmy ....................................... ............................................. Pertinent d a b

SECTION 2 . G m PROCEDURES

ApprOP.ed r e g u h t i m ....................................*..

Purpose of ~~anual...~.. .................................... ................................................ Defmtiorjg .................. Reference drawings and maLs Functions of the Construction Division ...............a.e...

Functions of the Engbeering Didsion Functions of the Real Estab Division ...................... .................... . Functfons of the U.S. Geologic rrL Smvey Inspections and maintgnanoe... ............................. .................................. Duties of the dam tender. .................................... Routine t e s t operations

....................................... Flood control bash.

Access roads................* ........I...................o..

Access s t M a y s F e j l ~ e ~ e a 0 e m o . e . e . . e * a * e e * * e e e e * * * * e e * e * * a o * m * * * * e * * * * * * * * * *

Inspections and msintenance a . E m t ) ~ ~ 1 ~ s . c . c * . * * . * * * * * * * * * * * * * * * * * * * . * * * * * * * * * * . * * b . Conemte and rgpap .................................~

E m b ~ n t d r d .. * ~ . . ~ ~ ~ ~ ~ ~ . ~ . ~ ~ ~ ~ . ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ . . ~ ~ ~ ~ ~ ~ d . Access roads and berms

8. Fences f . BwOtJ33.Lg w g . IIamrdous obstructions

SECTION 4 . OUTLET STftUCTURES

G e m d ....e.e.e................oe.....e~~~...e........~..

Approach c h e 1 . o o ~ ~ ~ ~ ~ ~ . ~ ~ ~ o ~ e e r . ~ ~ ~ ~ ~ ~ . ~ ~ ~ e ~ ~ ~ e ~ * * ~ ~ * 0. .......................................... Intake structure Gate ~ w e r s . . ~ . . ............O..........................~ Access gdllery Float recorder intake w e l l 4 Float recorder housg Gated outlets Outlet works s t i l l i ng bas$n. .............................. .......................................... Diversion intake Serv;Lce buflding Inspection and - w e a* CmeIs .ooo ........................................ .......................................... be Weep holes

SECTIOX 5 . SPIIif-HAY

................................................... General Approach channeI Control section ...e......................O.......e.a....~~ ................................... Spillway s t f 3Xng basin Spillway &t C-1 Counterforb and cantilever W s Inspections and main%emce

SECTION 6 . GAT325 AND HOISTS

Gates ............e........................................ .............................. Reservoir Regulation B bmd.. ......................... Hoist cylinders and appurtenances Electric motors and acoessories Inspections. tests. and nr~bbnance a . Genera. ...............e b . Ga-s .............o...........O.......~...........~~ C. Hoists and e r r s d . Pa5ntiX1& .......................e

SECTION 7 . ELEeTRICaL FAC1:LM'IB

Electrical supply and semrices .........................oo.

Staadby power unft .......................................~ Switchboard Light fixtures Convenience outlets.. ..................................~~~ Ground ssire ..............o..O Wansfomera

ELECTRICAL FACILITIES.. Continued

Inspections. tests. aPld maintenance

a. General

b. Electrical supply and service ......................~

S%andby power unit engiares C d . Stsurdby power unit = gene~atw

e. Switchboard and lighting fmmes

f. Trmferr&ng p h t t o standby s d c e ............... ........ g . Transfeming plant t o =son Company service

h. Shutting down plant durAng emergencies

SECTION 8 . H Y M i W H I C I N S T U T I O M S

SWf gages ..e..emae.r...aoo.e..o.e...e.ae.....aee...* Reservoir water-stage recmdess .......O Gate position recarders .........OO........................ .................................. Gate positbn indicators .................................... 0U.eflow gaging station Standard ra in g a @ . e ~ . ~ . . ~ Automatic ra3.11 gam S&bentation mmnts.. ................................. ......... Inspection. se rdebg. & k n a n ~ e ~ and reporting ab By the c h u tend^..^.. ......~...~................... ...................... b e By .t b U e S. Geob~kjscdP S w By the Engineering Di81aion. C. ...........e

FACILITIES

tenderas houme eeeacemeee..eeseoe.amcrc.oce.e.cooo.e o.

Electrh~al serv%ee and e ~ p d e e e Q Q ............~........ .............................. Inspectiom and ~ ~ ~ ~ c Q . a. ~eot~f~...... ....Q....................m b . ?at- ~ d ~ e d e ~ 0 ~ 8 b t ~ ~ ~ ~ . ~ ~ ~

c. 'VePlic1es and e@pm% d . T.and.Q~apw. ...*...........O.......e

MseeUBTaeo~ 8

TABLE 33' CONTE3TS-4ontItnuedt

SECTIGN U - W A m SUPPLY AND S3JAGE

Tdate~-s~ppJ.Y ~ ~ ~ ~ e e a o e c e e o o e e a o a e ~ . e . e ~ e e ~ s o ~ e o o e o ~ . e e ~ . ~

Sewage system,,, ,......... ........O.....eO...o. .... ......, Inspections ancl ~intenan~e,...,.........~......, Service bui l~g . . . . . . . o . . oe Gate c ~ e r e , , . , , , , . O D e . , ~ ~ . ~ ~ B O e . . ~ O ~ a O . . . e . ~ . e . e . ~ . . o . . o Dam tender1 s house,. . , . . , Inspections, tests, and maintenance...,..........,

a. Fire ext~shePseoO.O.O.Oe.~..~e~......~o..~~..~...

b. Fire hoses and bibbs C. Fire prevention, ....... ... .. .. . .. .. . . . .... , Accident prevention,.....,.......,.., SiXTIOE? 13 - RESERVOIR REGULATION XND FLOOD E3BRCEXCY RaU-S am ITS

Project Location P l a n of Flood Contfnol Basin Inspeetion Check Us% Test-Opera%ion Reporbs Deleted Drawings - "As Constm~ted" at~d Index (unattached) Sef erence lianuals (unattached) Instructions for Operation of Service Gates (revised) Snshction Mual - &%in Engine

General Saf ebj Requirements, Bl 385-1-1 Corps of Engineers, U. S , Array (~nattetched)

QPERATIQN AND MAINTENANCE YrANUAL

FOR

SAMTA FE DAIvi AND FEOOD-CONTHOL RESERVOIR

LOS ANGELES COUNTY, CALIFORNIA

SECTION 1 - INTWDUCTSQN

1.01. Authorizcation. The Flood Control Act of 22 June 1936, a s amended 28 June 1938, authoriaed a flood-control plan of improvement fo r protection of rnstropolitan areas i n Los Angeles County; Santa Fe Ilam and Flood-Control Rewrvoir is part of this authorized plan; it was constructed by the Corps of Engineers, Los Angeles Mstr ic t , between August 194l and January 1949.

1.02. Project location. me Santa Fe flood control basin is

located on the outwash area of the San Gabriel Mver i n the eastern part of Los Angeles County, Cabifornia, about 5 miles downstream from the mouth of San Gabriel canyon, about 15 miles northeasterly from Los Angeles and 3 miles southwesterly from the town o f Armsa . It i s bounded on the north by the Atchison, Topelm and Santa Fe Raflway, on the west by the suburban development of Duarte, and on the east by the industrial plants, homes, highways and orchards of the area between Azuser. and Baldwin Park. The location of the project i s shown i n exhibit B and drawing f i l e , No. 483/2, exhibit F.

1.03. Foundation of Santa Fe Dam site. The formation a t this s i t e i s Recent alluvium consisting primarily of gravel and boulders up to- 4 fee t i n diameter, together with considerable quantities of loose sand and very l i t t l e clay or silt. The records of deep water wells dri l led i n the vicinity indfcate that this gravel and boulder type of mater id . extends from the surface t o depths of several hundred feet. The majority of these records shows the formation to be loose and unconeolidated although layere of "tight sand" and "cemented gmve1,fl lying a t intervals between 100 fee t and 400 feet deep, have been repoP%gdl, 1 0 Bescri~tion sf project,

a. Princimal structures and equiment. Principal structures and equipment include (1) an ear thf i l l dam, approximately 23 800 fee t long wfth a maximum height of 92 fee t above streambed;

(2j an outlet works, consisting of an approach channel, an intake structure, a f loat recorder house, 16 gated outlet conduits, hoisting equipment, a standby power unit, a s t i l l ing basin, a downstream channel, and a service building; (3) er spillway, structure, consisting of an approach chernnel, an overflow ogee spillway, a s t i l l ing basin and an ex i t channel, (see drawing,. f i l e NO. 439/2, exhibit F, and sections 3, 4 and 5 of this manual), b, Hydrographic installations. Hydrographic installa-tions include (1) two reservoir water stage recorders, (2T-szxteen gate opening recorders, (3) an outflow gaging station, (4) two stan-dard glass-tube rain gages, (5) a recording rain gage, and ( 6 ) ds-cellaneous staff gages, indicators and sedimentation monuments, (see drawing, f i l e No. 43$/2, exhibit F and also section 8, t i t l ed flHydrographic Installations, ") c, C o d e a t i o n fac i l i t f es. Communication f ac i l i t i e s include a radio transmitting and receiving station and telephones i n the service building and i n the dam tender's house. (see drawings, f i l e Nos. 4.40146 t o &0/51, inclusive, exh5bit F and also section 9, t i t l e d fiCommunication Faci U t i e s , n, 1.65, Protection ~rovided. The %nta Fe flood control basin is an important uni t i n the flood-control plan fo r the LQS Angeles County drainage area. It provides protection fo r the Sm Gabriel Valley and the coastal plain area adjacent to the lower course of the San Gabriel River.

1,06, &sic dssian rewrts , A Hydrology Report entitled I1iiydrol-ogy - San Gabriel River above SaYlta Fe Flood Control Basintt was made 7 BecembtPr 1940, An NAndysis of Design for the Santa Fe b m , f l volumes I and 11, was submitted April 1 9 a . An addendum "8" was made August 1942 and addendum "Btl was made Yay 19&, An I1AnaPysis of Design of 6' x 9 ° Slide Gates for S a n k Fe Dam" was compiled i n June 1947.

1.07. Constmction history, The project was accomplished under several contracts, copies of wMch are on f i l e i n the office of the District Engineer, Los h g s l e s District, Corps of Engineers, Lns Angeles, California. Pertinent data on the principal contracts are a s follows :

a, Dm and a ~ m t e n a n t work, Contractor8 Farrison-Knudsen Company Contract No.: W.-509-Engm 1574 Work startedt 8 August 19W Work completed: 23 September 1943 b, ColmpLetion of e m a e n t and s ~ i l l w a y .

Contractor: Guerin Brothers Contract No,: W-04-353-Ibg. 1849 Work startedt 24 June 19& Work completed: 14 February 1947

c. Channels and levees.

Contractor t Kacco Corporation Contract No.: W-04-353-Eng. 1981 Work started: 1 Ihy 1947 Work completed: 24 Uecember 1947

d. Slide pates and a ~ ~ u r t e n a n c e s .

Contractor: Guy F. Atkinson Company Contract No.: W-04-353-Eng. 2115 Work started: 23 September 1947 Work completed: 26 January 1949

8OTEr The construction of S a n k Fe Dam was curtai led i n 19A3, pr ior t o its completion by order of the Chief of Engineers a t the recommendation of the riar Production Board, and was resuslled in 1946.

1.08, Pertinent data.

Drainane area, Sq. miles

Flood control basin.

Area a t spillway crest (elevation 496) Acres Capacity a t spillway crest Acre-f ee t A r e a at maxLmnun water surface (elevation 508) Acres Capacity a t maximum water surface Acre-fee t Area a t top of dam (elevation 513) Acres Capacity at top of dam Acre-feet

&!A* Type Top elevation Height above streambed Length at crest

Feet, m.s.1, Feet Feet

S?3i llway.

Typs Crest elevation Feet, m.s.1, b n g th Feet Idaximum water surface elevation Feet, m,s.l.

Surcharge on cres t (meximum water surface) Feet Discbarge (maximum w t e r surface) c.f.s.

Outlets, Gates - type Gates - number Gates - s i ~ e Feet Gates - enLreunce invert elevation Feet, m.s .1 .

Conduits - nwber Conduits - size Feet C~nduits - lmgth Feet I%ximum capacity a t spillway crest c,f.s.

Regulated discharge at spillway crest c.f.s.'

Ultimate renulation (revised reservoir design floodl.

Length of design storm Inflow of storm

Days Acre-f ee t

Inflow peak c,f .so Ou%flow peak c.f.8.

Reduction i n peak c.f .so

Earth

23,800

Slide Gates

6 x 9

7e33 x 7.33

SECTION 2 - GEhERAL PBOCEDURES

2.01. Approved r e d a t i o n s 8

a. Project Operation Ibintenance Guide EI4 1130-2-303, 20 3une 1960.

b. Emergency Flood Control, Activities, LAD14 500-1-1, Annex A Part 1 - U. S. Army Engineer District, Corps of Engineers, 110s Angeles.

c, Fire-fighters Training Ifanual.

d. General Safety Requirements, EM 385-1-1, 13 ikrch 1958.

e. Motor Vehicle Inspection - Technical l*ianu&l 18-660-1 Operatorls Yaintenance Instructions and Procedures for Administrative Xotor Vehicles, 16 A p r f l 1957.

f. Mre -vention Code M.B.F.U.

g. National Electrical Code, N.F.P.B.

h. Reservoir Regulation I4amm.l for Santa Fe Dam. (see paragraph 6.02).

i. Chemical, Biological, Radiological Ihnitoring P Responsibilities - See Annex D, C i v i l Defense, Fart 11, EM 500-1-1

(to be published).

2.02. FUmose of manual. The purpose of t h i s manual i s to

supply the dam tender and the d i s t r i c t operating personnel with instructions for proper inspection, operation, and maintenance of the Santa Fe Dam and flood control reservoir. These instructions will.insure the continuous maintenance of structures and equipment and their operation i n such a manner and a t such times a s w i l l obtain optimurn benefits.

Speciali~ed terns wed i n t h i s manual are "Engineering Mvisionw , "Construction Divisionn and "Real Estate Division" refer t o organiziations within the U. 8. Amy Engineer District, Los Angeles. (b) tlFlood season" refers t o the period from 15 October to 15 April when most past floods have occurred.

(c) ttEmergency Flood Conditionn refers t o periods during which the reservoir water surface r ises above the crest of the spillway a t elevation 4%. A l l elevations refer t o mean sea level datum.

-2,04, Reference drawings and muds, Pratsing f i l e numbers i n this manual refer t o *as constmcted~.d.ratPrPngs; half-size reduc-tions are included as exhibit F and separately bound, Drawings, manuals, and instructions of rmufacturerst equipment are l i s t ed i n exhibit G and are on f i l e i n the d i s t r i c t office and at the project, 2,05, F'Lll?ctisns of the Conatnuction Division, Operation and maintenance and all inspections are under the supervision of the constmction division, with %he exception of those for hydrologic i n sUa t ione r (see section $1, The general duties include the following :

a, Keg perasme% shall be trained i n ordsr that regular inspection, operation, and xaintemce work all be performed effi-ciently and t o i n w e that unexpected problems r e l aud to flood control m y be handled i n an expeckitisus and orderly manner, The men sha l l become feuniliar with the provisione of this manual, the construction specif5cations m d the constmctedv~ drawings.

b, There. shall be DO encroachment OF trespass which w i l l adve~sely affect the eff icient opka%ion and maintenance of the project, The Chief, Constmctiow L&vision, ~kial l therefore cause notices t o be p a t e d a t conspicusus places dong the project right-of-wary dh?eo%irag garblie attontfsn $0 this mesquh-ement and la@ shd.1 arrange f o r the proetsaution of offsrndere and mpo* csotione taken t o the Distriet bgimgtr. AU t reepeeee or violatione of outgrants tiis-covenad by oon~tsu~%ion d i v i ~ i o n p s ~ o m e l be reported to the ReaL E~ta%cs U e @ i o n o

c. The CmsWct%on B%vSeblm rev iew plans and furnishes comments t o the ba% Estate Mvirsisn on requests from publtc or PEL-vate i n t e r e ~ t a for 001hba urn ~f land aPId =tor meas, and per-forms inspectione during aonetru~tion t o assure compliance w i t h approved plans dm The Chief, Construction Division, shall establish a f i l e of all reports and meorde concez-ning the maintenance and opera-tion of the project works, a, The Engineering 1XvSsion p e r f o m engineering resews of csll plans and furnishes engineering comments to the R e a l Estate Division an mqueosts from public or private interests for collateral Use of ~ 3 ' 0 j ~ c t landso b, It conducts periodical project, These surveys serve a condition of the various parts of t he project and (2) t o see i f a l l the repairs and improvements have been carried out that were previously recommended,

c. It shall also t ra in key personnel i n the_-,peration of service gates, hoists, standby power units and c o d c a t i o n f a c i l i t i e s and i n the opmt ion and maintenance of hydrologic, instal lat ions and f lood-fighting equipment. They shall become familiar with this manual, the Annex A to EM 500-1-1, the Reservoir Regulations Pianual, which is revised periodically, and the "as"..

constructedfl drawings,

d. It prepares and executes all flood-fighting plans and through the Hydrology & Reservoir Regulation Secti'on directs the dam tender or his assigned alternate i n the operation of the gates. It keeps records of reservoir stages, inflow to th* reservoir, releases through the outlet structures and spi.llway overflow, e, The Engineering Division is responsible fo r the inspection, servicing, and maintenance of all hy&ologic installa-tions. Their routine inspections are done by the dam tender.

f , The supervfsion and maintenance of radio installa-tions is also a ftmction of the engineering division, 2.0'7. Functions of the Real Estate Division,

a. The Real Estate Division processes all. permits, licenses, easements, or leases through appropriata channels and fadministers completed instruments.

be It insures compliance through periodic inspections and acts upon d l v i ~ l a t i o n s of outgrants, em It furtxlshes t o the Construction MvisPon, copies of ail perndts, licenses, easements or leases.

2.08, Furncti~ns of the U, S. Geological survey. By agreement between the Corps of Engineers and the U. S. G. S. the l a t t e r w i l l service the outflow gaging station, make discharge measurements and compile and publish the ~u t f low records i n the U. S. Geological Water supply Papere.

2.09. fnsuect5one and nudntenanee.

a, Bs the Conetmetlon and Enafneerin~ Divisions.

PerAodic inspection8 ahall be made by the Chief, Construction Mvision, o r his authorized representatives i n cooperation with the Chief, Engineering Mvision, or his authorized representative, as required, i n order t o determine maintenance measures necessary t o insure ser-viceability of the works i n t h e of flood, Such inspections shall be made immediately fsllowlng each major highwater period, and a t intervals

2-3 not t o exceed 6 months and a t such times as m y be necessary.

Immediate steps ahall be W e n t o comect dangerous conditions disclosed by such inspections and regular maintenance repair meammer sha31 be accomplished during the appropriate season as scheduled by the chief of the division. AU. repairs shall be made i n accordance with s engineering prac%ice, t o l ine and grade and i n accordance with deta i ls shown on "as ~ o n s t r u c t e d ~ ~ drawings, exhibit F.

be BY the daa tender, Periodic rou%%ne inspections of structures and equipment and of the project area shall be made by the dam tender or his ass i sh ts t o determine maintenance measures that are required, These inspections during the non-flood season sha l l be made a t in'cerrals of not more than 90 days; during the flood season, beginning 15 October, a t in temals of not more than 30 days;

a lso immediately following each flood, 1Jbre frequent inspections shall be made i f required fo r the safety and efficient maintenance of some features of the project. During each inspection, items requiring maintenance shall be checked and descrfbed on the inspec-tion check lists included as exhibit C, After each inspection, one s e t of the inspection lists shall be promptly submitted t o the Chief, Ydntenance Section, who w i l l route it to the Design Branch, Engineer-ing Mvfsion; one set shall be submitted to the Chief, Operations Branch; and one s e t hall be retained by .the d m tender, Faintenance sha l l be performed by the dam tender if feasible. If maintenance requires hiring additional labor or equipment, the dam tender shall rauMt t o the Chief, Operations Branch, a list of proposed maintenance measures, Nomoal m i n - t e w e shall be made without delay during the non-flood season.

c a . A l l f i r s t aid act iv i t ies i n connection with flood emerryeolcies are under the supervision of the Chief, Safety Bmch, A t the beginrdng of each flood season and peri&cally thereafter, as mqpired, he w i l l inspect the project, see that proper equipment is at hand, and see that the dam tender and his assistants m e adequately i n s h c b d in f i r s t a id procedures and safety. Appropriate equipment includes (but is not limited to ) standard first-aid lefts and such items as blankets, stretchers, safety belts, l i f e l ines and kapok vests. Grappling irons are provided from the base yard and gas detectors and oxygen deficiency lamps (Wolf lamps) are provided by the b s Angeles District office* (see Flood Emergency YanuaL, paragmfi 6,06), 2.10, Duties of the dram tenderr, The dam tender o r his alternate is required t o perform the following dutisso a, Be present a t the tiam when rainfall or sunoff is

OCCUT&~*

b, See that all equipment a t the project, including recording and indicating gages, gate mschebnism, power units, radio, etc., is 4n operating condition, c, Perfom routine t e s t operations, d, Operate the gates in accordance with instructions from the Hydrology & Reservoir Regulations Section, e, Follow the fixed gate operation schedule posted in the control house i n the absence of communications with the Hydrology & R e s e m i r Regulations Section or i n the absence of a representative from that group, f, Service all gages and recorders, wind the clocks, i n s t a l l new records paper, etc, 8;. Guard the project against vandalism, sabotage and fjtres, h, Guard against unsafe conditions i n the project area,

i. Report on trespassing and encroachment of right-of-way,

j. Naintain routine records, including water surface elevations, outflow gage heights, precipitation amounts, gate open-ings and logs on prescribed form.

k, Keep the premises clean, painted, and in good rep*, 2,U. The dam tender or his alternate sha l l test- a d elect r ica l f ac i l i t i e s i n the control house every 30 dap-and the standby power unit every 15 days, Test opmathon reports (exhibit D) shall be completed i n t r ip l ica te eLfter each test, One copy shal l be promptly submitted t o the Chief, Engineering Division, one copy t o the Chief, Construction Division, and one oopy shall be retafied by the dam tender.

SECTION 3

PROJECT ANII R B ~ V O I R AREA

3*01, F l o d control basin, The flood-control basin is f o m d by a rolled earth-fi l l dam having a crest length of 23,800 fee t at elevation 513.0, and a maximum height above ground of 88 feet, or 92 f ee t above the bottom of the outlet conduits. The basin s i t e is on the sloping p l a h of dluv5al fan of the S m Gabriel Canyon where no abutments are available. The approach channel ts the reservoir is designed t o c a m a l l discharges up t o 98,000 cubic f ee t per second, the peak ra%e of the channel design flood from the mouth of the San Gabriel Canyon t o the flocd control basin, IPRprovements t o tbe channel heve been made by the Los Angeles Conrrty Flood Control D i s -t r i c t a t various times during the past 20 years. The ends of the dam have been turned upstream and give the dam ar! approxhmte horse-shoe shape, with the spillway section located i n the right wing. The area and capacity of the basin a t spillway crest (elevation 496) is approximately 1,060 acres and 33,400 acre-f eet, respectively; a t maximum water surface (elevation 508), 1,250 acres and 47,400 acre-feet; and a t top of dam (elevation 513), 1,315 acres and 53,400 acre-feet. (see drawing, f i l e No. 439/2, exhibit F, )

3.02, Access roads, The area immediately surrounding the darn site 5s accessible on the north v9a Foothill Avenue, on the east via IrwindaLe Avenue, on the south via Arrow Highway and on the west via Duarte Road. A 3Moot wide servfce road runs on top of the dam along i t s entire length. This service road is connected with the Arrow Highway by an 18-foot wide grouted rock ramp road-way, (see drawSngs, f i l e Nos. 439/2, 439/40, exhibit F. )

38@3* APL access stairway OR the upstream face of the the center of the intake structure of the outlet works goes up t o the service road on the dam crest.

From a point direct across the service road, a stairway descends on the downstream face t o the 20-foot berm a t elevation 475, From there the walk ramp exhnds down the slope of the dam t o a short stairway leading t o the area 191 front of the slervdce building.

Along the east w a l l of the Sntake s t m t u r e s a stairway and a w a l k ramp go down t o the water stage recorder intake well. (s@ drawings, f i l e NOS, 4381172 Rev. A, 439/1319 exhibit F. )

3.ae Fmce~a Safety guard fences l ine both sides of the -spillway for the entire length, and also both sides of the still-i ng basin of the outlet wmh, The fences consist of 2-inch dia-mond mesh chain aink geLa.d%ed wire screens, 36 inches wide, topped by two strands 02 palvainized barbed wire, They are sup-ported by 1-5/8-inch galvanized s t ee l tubing fence posts. and strengthened with 1-5/8-inch s tee l tubing braces a t each change i n grade 6r alinement. Posts and braces are s e t i n 2-inch pipe sleeves which are s e t i n the top of the w a l l . (see drawings, f i le Nos. 438/173, 439126, 439/198, and 439/200, exhibit F.)

3.05. Inspections and maintenance. The dam tender or his

alternate sm perform periodic inspectiom and maintenance and shall complete inspection check list w shown in exhibit C. Main-t enace work is described in de ta i l in the following paragraphs,

a. ErPbankplewts. PIaintenance nethods fo r repair or reoonst~uction of the ~ ~ n t s shall depend upon the extexit of the damaged section, If the damage is small , sand and gravel or other coarse granular material may be used f o r rep&. If the damage is large, the f i l l shall be nade In the same manner as the original construction: homogenous material from borrow p i t s approved for the project shall be used and compacted t o a density equaL to the original section.

b, Concrete and riprap, Damaged concrete or riprap structures s h a l l b e y , Broken concrete surfaces and exposed reinforcement s t e e l shall be .thoroughly cleaned by chipping or sandblasting and -shall be built up to the original dimensions;

pnewmtiually placed Portland cement mrtar is satisfactory fo r this work, Srnall cracks in the concrete may be filled with a sph l t . Any indication of settlement, uplif't, or failure of ctoncrete structaarers shall be reported by the Chief, Construc.i;ion Division, t o the C h i d , Engineering Division, for aalysi& asad for recommendation on remecllral action.

c. Side drains. Drains have been aonstructed through the embankment 03 the righ$ wing of the dam a t Flower Avenue and Highland Avenue. Since the in le t s of the drains are below me;rdmuw water swface elevation, automatic drahage gates have been installed at the outlets. Any indAcation of seepage through the dam embank-ments shall be reported by tkie Chief, Construction Division, t o the Chief, Engineering Division, fo r recommendation of remedial action, The clJ.a5ns sha l l be kept f ree f r o m any obstructions that would affect a f ree flow through the drain pipes or the operation of the automatic gates. Automatic drainage gates on the outlets a t Flower and IIighland Avenues shall be oiled and checked during each inspection, (see drawings, f U e Nos. 439/L3, and h39/ltL, exhibit F. )

d. Aecess roads arndberms, Aecess roads and e m b m t berm shall be adequately maintained fo r vehicular t ravel so tha t ordinary maintenance of %he project and flood-fighting operatiom will be facilitated, The crest with the roadway on the dam shall be well crowned and maintained t o drain readily.

e, Fences. Wn%enance of the rigbts-of-way and safety guard fences s m l u d e keep- (a) l ine posts f Znaly s e t and gates hung in good alinemnt; (b) barbed wire t ight and broken strands repahed; (c) corner posts, gate posts, and braces firmly set; (d) chains and l o c h attached t o a l l gates; and (e) gate keys avaflable at the dam tender1 s house t o permit authorised t ravel throughout the property, Cfdvanised posts, braces, and gates should not be painted unless galvanizing fa i l s , in which casc the surfaces shall be properly prepared before painting, f, Burrowing anjmdls. Burrowing animals in or near the dam shall be exterminated. Their rimwags and dens shall be opened and thoroughly compacted a t the same t& they are backf i l led~ Trap-ping and poisoning may be used for the extermination of burrowing animdls. Information about other methods of animal extermination may be obtained from the county agricultural agent, g, Razmdow obstructions, Reservation area used by authorised personnel s h a l l be kept f ree from obstructions that may cause injury or impede inspections, maintenance, or flood-fighting operations, Materials, equipment, and auxiliary items' shall be stored in such a way tht they a re not hazardous to personnel.

SECTION 4 - OUTLET STRUCTURES

4.01. General. The outlet works are located near the geomet-

r i c a l centerline of the Santa Fe basin, They include an approach channel, an intake structure, a water stage recorder intake well, a water stage recorder house, sixbeen gated oonduits, a s t i l l i n g basin, a service building and an outlet channel, Descriptions of the various parts mantioned above are given i n the following para-graphs, (see drawing, f i l e No. 439/131, exhibit F, ) ach cE.banne1. The elevation of t'ne a2proach channel .O feet, The approach channel is lined Kith m u t e d rock with side slopes exbending u t o elevation 431.0. (see draw-ing, f i l e No. ~39/131, e*bit Fey h.03. Intake struuture. The intake structure is a reinforced concrete d, located a t the toe of the upstream slope of the dam symmetrically-to the centerline of the outlet works. - I t is 206 feet long, 71.75 fee t wide and 53 fee t high and consists of four equal units, each one having four gated inlets , 6 feet wide and 9 fee t high, Trash racks are provided i n the upstream face of the inlet structure. A stairway along the east W a l l and a grouted rock walk ramp lead t o a water stage recorder intake well, located a t the foot of the approach channel. A stairway leads from the intake structure t o the watm stage recorder house near the tor, of the dam, (See drawings, f i l e Nos. 439/31, 439/45, exhibit F. )

0 , Gate chamber$, Four gate chambers f o m the intake structure, kach gate chamber contains four gates, totaling sixbeen gates. These gates are operated by hydraulJ.c o i l cylinders with all operating and control equipment located i n the gate chmibers, Parts may be nowd with a heavy dolly running on a serxlce car track which extends through the four chambers. An overhead trol ley beam with a 5-ton, 20-foot U-b hoist runs from gate chamber tWt into the access gallery. (see drawings f i l e Nos, &0/1.1, &0/15.12 &0/20.1, W10/33, 440/36, u0/38, h0/39, and .!1.40/41, exhibit F.)

4.05~ Aocess gallery, An access galleryo along the center-l ine of one of the center sections of the conduits, connects the gate chambers wh6h the s&ce building, It is approximately 398 fee t long, 12 f ee t wide and 12 feet 4 inches high, A short stair-way with a removable gwrdrail descends from the f loor of the gate chamber nBn a t elevation 439, 27 t o %he floor of the access gallery a t elevation 434,O. (See drawings, f i l e NQS. 439/LS, 439/U1,1 and 439/131, exhibit F. )

4.06. Water stage recorder intake well. The w a t e r stage

recorder intake well is a reinforced concrete wit, located a t s tat ion 7*&.b5, near the outer end of the east wing wall of the intake structures of the outlet works, It is approximately 33 feet deep, but 'only about 8 f ee t protrude abwe the embankment. The upper part, which is the reoorder house proper, measures 4 f ee t by $ feet inside and the lower part, being the well, is 3 fee t by b fee t inside, An access ladder, consisting of s t e e l rungs, extends fromthe bottom of the wel l t o the floor of the reoorder house, A t rap door in the floor affords entrance t o the well. Wbr enters the well through a series of six 12-inch by 1-inah slots, spaced 3 f ee t a p t , i n the north w a l l . (see drawings, f i l e Nos. 439/&6, and &O/L1, exhibit F. )

4.07. Water stage recorder hoke. The water stage recorder

house is b d d reinforced concrete shaft, located i n the outlet works on the upstream side, near the top of dam, at stat ion 977.0, A flight of o o m e t e stairs, 3 f ee t wide, provides approach from the access gallery t o the s p b l stabwag i n the f loat recorder shaft. An 18-inch diameter floatwell pipe forms the core of the structure with the sp i ra l stairuey wound around it, leading t o the top floor of the shaft, Windows in the n o ~ t h hslf of the recorder house afford the operator a view of the intake, The l ights in the recorder house and shaft are contfoued from a three-way switch at the head of the sp i ra l stairway. The top floor oonW,m the water stage recorder, an interphone, a radio transnit ter and receiver, a convenience outlet md a flush mounted panelboard, control lhg two 2,000-watt floodlights, mounted on the roof, (see drawings, f i l e Nos, 439/99, 439/136, and 438/174, exhibit F* 1

4-08, Gabd outlets. The outlet conduits, one for each gate, pass stre~igh% through the embankment section i n a cut 10 t o 15 f ee t below nor& sound-surface a t invert elevation 420 t o 421.0, The s3xlaen conduits are grouped i n four 4-basreled sections, A t the gates they a re 6 f ee t wide by 9 f ee t Ugh, changing t o 7.33 feet square conduits and extend L73 fee t dowmtxesm from the e n t r w e portal a t station && t o the outlet portal a t station 13+37 and empty into the s t i l l i ng basin, (see drawings, f i l e Nos. 439/55, k39/118, and 439/160, exhibit F. )

4.09. &let works s t i l l i ng basin, The st3ULhn basin is appro-tely 195 feet wide and 173 f ee t long from station 13+37 t o 1$10. The drop from the outlet portal a t elevation 420.0 t o the floor of the stfll3q basin a t elevation 401,O ie i n the form of a parabolic arc with a c i r c u 4 r reverse curve a t the bottom, Two rows of baffle blocks, one row staggered i n relation t o the other, are inserted t o aid in the formartion of a hydraulic jump fo r the mdwtmMI possible discharge fromthe outlet conduits, A t the lower end of the basin a 9-foot high and 4-foot wide end sill across the entire width is providedto control the hydraulic jump, UpWt of the slabs of the s t i l l i ng basin and approach is relieved by a series of weep holes, (see drawing, f i l e No, 49/26, exhibit F, )

4 .lo. Diversion intake. Frovision for a diversion of a certain amount of wahr t o the Rio Hondo c h m e l in order to satisfy exist-ing water rights is accomplishedthrough a diversion channel consist-ing of a series of five &-inch square gated outlets contained in a concrete block and equipped with five 5-foot square Calco slide headgates. The diversion charmel branches off from the wet,wall- of the s t i l l ing basin with the centerline a t station l4i90.50 on a c u m having a radiua of 150' feet. Invert elevation of the square outlets is 405.0. The slide gates are being operated by the Los hgeles County Flood @oatml District. (see drawings, f i l e Bos , 439/131, 439/160, exhibit F,)

4.U. Service butlding. !3!he seTvSce buildhg, consisting of two edjacent redangplar units, is a reinforced concrete structure, covering a floor space of approximately 2,000 square feet. It is located a t the base of the downstream slope of the outlet works, mar the s t i l l ing basin. The smaller of the two units, or west wing, containa a storeroom, a to i le t and service sink. Separated by a w a l l is the larger unit cont-g a switchboard, a standby unit, a telephone desk, and a S-ton, 20-foot lift, trolley hoist for servicing the stmdby d t . The traveling crane requires a 10 hp, hhO-volt, 3-phase sqtll"frrsl cage motor. An @-inch up-blast ventilating f ztn, drimn by a 1/3 hp, ll0-volt motor, provides ventilation for the gate chambers, A 20-inch exhaust fan, driven by a a hp, IlO-voPt fan motor, is located on the floor of this wing. A large sliding steel door with orire glass panels provides access t o an adjacsrrt parking space, approximately 200 feet wide and 50 feet long. An opening i n the w a l l fpposite the door leads l n t b the access gallery. A waterline of 1s-inch galvadzed s teel pipe, extending f r o m tMs wing of the service building t o the upstream end of %]he aecess galleqr, supplies three, 3/L-inch hose bibbs i n the gallery as w e l l ips one 3/4-hch bibb in each of the four g a b chambers. [See drawings, f i l e Nos. 439/80, 439/lllel, 439/u9, and 440/13, e-Lt F) .

4-12, BspecWon and maintenance, The dam tender or his alternate shall inspect each year, before the flood season starts, the interior of the-outlet sttmet& and the f u l l length of the outlet conduits aad shall eonplete inspection check list, as shown i n exhibit C. Hn addit9on t o inspection and maintenance work described i n paragraph 345a for embankmen%s, paragraph 34% for concrete and riprap, a d paragraph 3-053 for fences, the dam tender shall perform m.htewce mrk perbahdng mostly $0 the outlet structures.

a. Channels. Channels shall be kept free of drift-mod, trash, silk., and other debris. Driftwood, brush, weeds and other co&ustible trash on the proJect shall be b m d safely i n areas remved from project stmctmes. Inco&ustible accuuxulat ions shall be hauled away and duped in approved disposal amas.

b. Wee holes. Weep holes in the linings of the approach and outlet c h - m b p t open. Plant growth, birdat nests and animal-den accumulations shall be removed from the weep holes, using weed killer to keep d m plant growth, and a piece o f heavy wire bent into a hook at one end to remm birds' nests and animal-den acmmlations. S i l t deposits shall be removed from the holes,

5.01. General, The spillway is an overflow gravity ogee

section located near tihe r ight abutllfant. The structure is rectan-gular in shape, apysrosrisnately 250 f ee t long and 1,200 fee t wide, Idhen the spiUEsayis in operation, its discharge is directed a t what has been called the head of E l Monte Island, so that the flow would &.vide naturally down the San Gabriel River and the Rio Hondo. For purposes of dismssjeom, the spillway is divided in the following sectionso approach channel, ogee control section, upstream gravity walls, dowtream gravity warn, s t i l l i n g baab, and exi t channel.

These p&s are described i n the folloPsing paragraphs. (See draw-ings , fCLe Nos, 439/337, and 439/198, exhibit F.)

5.02, Approah chamel, The natural ground surface upstream from the spillway is on a slope a d offers a constr icbd approach.

A reinforced concrete apron, a t elevation 475.0, extends 38 feet 6 inches upstream f m m ogee and is 1,2QO f ee t wide. Gravity walls em, provided on both sides of the structure t o retain the earbh ~ ~ n t xpstreen from %he ogeeo (See drawings, f i l e Nos. 439/197 a~za 439m8, e m b i t F. )

5.03* Control section, Tlhe control section, located a t the upstream end of the spillway, i s a gra~ey ogee section with a crest elevstion of &96*0 fee%, crest length of 1,200 fee t and height of 21 fee t above the approach slab. A l0-foot concrete cutoff, a t the upstream toe, w a provided t o reduce seepage under the struc-

tm. Wing wall cutoffs extend in to the errjbankrnent on either side of the o p e t o prevent percolation behind the w a l l s , A secondary drop structure of parabolic shape connects the spfllway bucket (bottom elevation b73.0) ~ 5 t h the f loor of the stilling basin, a t elevation 460,0, (See drawings, f i l e Nos . 439/198$ and 439/200, exhibit F,)

5e040 Tlhe s t i U g basin, located at the downs , is pmvided t o dissipate the e m x a and t o reduce scouring i n the domtmam channel. It i a 70 fee t l a g and 1,208 fee% wide, with an end siU 9 fee t high, Two rows of baffle piers, 5 f ee t in height and 3 f ee t wide, are placed at 6 fee t center to center, one row being staggered i n relation t o the other, (see drawings, file Nos. 439/200 and &39/201, exhibit F.)

5*05e From the end s i l l of the sti-g b 1 approximately 5,000 fee t long, with grouted stone-p~obcted side slops, is provided t o carry the spi l lmy discbarge pas% the lower par% of the embank-mnt. The levee heights provide approximately 2 f ee t of freeboard above the &er surface f o r the mimimum possible discharge over the spillway. In order to provide added safety t o that portion of the dam which paral leb the spLllway channel an the east side, the levee toe has been Eadg I& feet deep on the east side and 8 feet deep on the west side, Tke f i r s t ZOO feet of chamel below the end s i l l a m f iUed with derrick stone across the channel bottom to prevent scouring below the end sin. (See drawing, f i l e No. 439/198, exh%bit F a )

5,06, Counterfort and cantilever wallrs. Upstream and down-stream counterfort walb a m prodded on each side of the structure t o retain the adjacent earth e&a-n% upstman and .downstream from the ogee. Safety guard fences are strung on top of the walls on both sides of the spillway, The w a l l s a t either end of the ogee section were designed as cantilever and monolithic e t h the ogee.

(See &wing, fLle No. 439/200, exhibit F,)

5.07. Inspections and maintenance. The dam tender or h3.a

alternate shall perform periodic inspect ions and &nten~~~.ce according to par&paph 2 : ~ ~ t i t l ed -"~loutine inspections and main-tenawn and shall cong,le%e ZPsspsdion check list as shown in e a b i t C. The spjlI.lw51y shall be inspected at least once each par during the dry season. Inspection and maintenance of concmte and brrick stone s t r ac fms , channels and weep holes, and the e w ination of hazardous o b s t m c % ~ o ~ ~ have been described in paragraph 3-05 (g). In addition, the swface d3.ains through the right gJslg of the dam shall be kept free from weeds, trash and accumlations of s o i l from the exeava%ed b -ken or displaced concrete shall be pro*w mpaimd*

SECTION 6 - GAT= AND HOISTS

6.01. Gabs* The control structure consfsts of 16 redtmgular

conduits wLth invert elevation a t 421,0, A l l of the 16 conduits a m 6 fee t by 9 feet i n cross section and controlled by slide gat_es, also 6 feet wide by 9 feet high, For con%rol of the openings, hydraulicsUy operated slide gates have been selected by reason of their simplicity, low mintenance cost, and the fact that this type of gate is less subject to damage under careless or inexperienced handling, Relief valves a m provided i n the pressure control systen to prevent the developnt of excessive pressure and no damage Mil result i f a gate leaf closes againat an obstruction as the pressure simply builds up unti l the relief valves discharge. The gates are designad for madmum average hydrostatic head of 87 feet above the conduit invert, Hotor driven high-pressure rotary pumps sup~3y o i l t o the slide gate hoist cy3bdexs. The 16 gates are set Gp- on 2 batteries of 8 gates each. Each battery bas a separate o i l pressure system, in-cluding a sePvPce pimp and m%or and a standby pump and notar. Each gate is operabd by a manually controlled 4-wy valm located mar its hoist q b d e r in the gate chaaiber.

Four of the slide ga%es, Nos, 3, 7, 10, and a, can be locked a t any positTcan between the including fully cXosed and fWI.7 open.

This is accomp3is&ed by hy&aul=Lo automat5a gate holdem mounted on the head of the hydraulic operating cylLnders and controlled by the o i l used to operate the gates. 'Plae remhing 32 gates, when not closed, can be looked in fully owned position OW. This is accompUshed by antomatic gate hange attached t o the ceiling d i rec t l y above %he gate o rating kderS. ( ~ s a &awlngs, fib Nos. &0/1.1, &0/15~1. 6 / 2 0 .la ZT/3;0/36. and &0/38, exhibit P. )

A msemir regalation e m i r RsguaaLion Section.

eludes the following tables and curves r be OperaS1ion of Iss Ang Pes County Flood COH1tm1 DiB-trict dams* e c, Outlet gate operatio schedule. Ii

d. Elevation - dischargi curve.

e. Outlet gate &SC~GP ctLT"8esv 9 f, Resemir storage t

.&I g, Outflow gaging station discharge c u m .

h. SpUway &scharge table, 6,O3* The gates are operated by sixteen nders with a l l operathg and control equipment located in the gate chambers, which are separated into two complete systems of eight units each. Pres-sure and return pipes of both systems are connected by mans of interconnection valve so that any gate can be operated by any one of the four punping zrnjts a t the ra te of about 1 foot per minute, Each hoist cylinder is equipped Wth a gate position indicator, (see drawings, f i l e nos. &0/1.1 and 440/38, exhibit F) , 6.04, Electric motors and accessorieso Electric motor driven high-pressure rot- pumps supgly o i l t o the 16 sl ide gate hoist cylinders, grouped in two batteries of eight. Each battery has a separate o i l pressure system, incl~idjng a service pump and motor and a standby pump arid motor. Each one of 'the two pump units includes a squirrel cage hduction motor, 10 horsepo~rea, 1,000 revolutions per ndnute, volts, t o t a l l y enclosed, with f m e momted vane type rotary plaaqp, The pump suction a d o i l return lines are eon-mctsd t o a 250-ga31on tank, which is f i l l e d t o a level of approx-imately 160 gaU~y38 m h i m m when the eight gates are fu l l y open, (See dr , f i l e Ho. &0/fjl, exhibit F. )

6.05, The dam tender o r his alternate shall perfom periodic inspections, t e s t s and mainte-nance, as described in paragraph 2-EO and 2-~l,-and shall complete inspection check list as shorn i n exhibit C, Additional information is given i n booklet t i t l e d '8mLa Fe Dam, Ins~ructions for Operation of Service Gates,!' 2~ exhibit 0-2, Maintenance work pertaining t o service gates and hoists is described i n deta i l in the following P=-asa~bo a, General* The gate and hoist assemblies sha l l be maintained i n the best possible operating coz~dit;ion. They shall. be tes%ed once every month and %he report (see exhibit B) sha l l be submLtted t o the 3ngLneesing Division through the Cons-bruction Division, Repairs, wWch shall be made by electricians and mchanics frorathe D i s t r i c t base yard, shall con.tomto the standards specified i n the eontract specifications f o r the ori-ginal. work. hose, damaged, wsemiceabPe, or missing parts sha l l be promptly tightened, repaired, or replaced,

b. Gates. Gates must come t o a true watertight closure agabs t the bottom seal, The Chief, Engineering Div'lsion, sha l l be notified by the Chief, Constm%ion Division, whenever the gates f a i l ta close t ight ly or whenever the seals am damaged, Gate-seal surfaces sha l l be kspt clean and Tree from mud and sand, and the bottom sealing surface shaU be kept f ree from rocks or other obstructions. To dnlmize the adhesion of abrasive dust and sand, the gate seals, and f ram seals sha l l hlEV5R be lubricated.

c. Hoists and motors. Hoist rimtors sha l l be kept prop-erly luBFicafad. Before attaching the grease gun t o the grease fittfng, wipe the f i t t i ng carefully t o remove a l l accumulated dirt and gr i t . Each hoist assenib3y sha l l operate smoothl;g. and without abnormal noise or vibration. The gate position indicators s h a l l b e adjusted t o show the actual height of the bottom of each gate above the intake h v e r t . Each gate sha l l stop automtically a t the fully open position and sha l l close t ight ly wlthout shock. F&ll bearings of the hoist motors sha l l be checlced every 3 months. The hoist moto~s sha l l be lubricated and maintahed by qualified electricians from the District base yard. (See paragraph 7-08.)

d. Painting. Painting of exposed raetal surfaces sha l l be done as required. Surfaces shall be thoroughly cleaned before painting; o i l and grease sha l l be removed with suitable solvents and clean cotton rags, and rust spots and loose paint, with s t i f f wire brushes. Paint sha l l be applied i n a workmanlike manner and i n accordance with the applicable paragraph of the oziginal construction and supply specifications. Gates, gate frames, trash racks, and other metal surfaces e m s e d t o water sha l l be painted with rust preventims.

SECTION 7 - EUCTIU;CiiL FACILITIES

7001. Electrical energy ig q p U e d at by the Southern Cali-fornia Edison Compaqy t o a wood pole stepdown transformer rack, located on the south side of Arrow Highway, about 60 f ee t east of the bridge over the outlet channel, The single-phase lighting transformer is attached t o a pole 180 fee t east of the meter pole.

The 3-phase power lead and.