LADM-NO 1130-2-22 Whittier Narrows Dam FCB OM Manual 07-1963.pdf

LOS ANGELES CW,NTY DRAINAGE AREA,, CALIFORNIA E,

8 0 3 , I i

OPERATION AND MAINTENANCE MANUAL

FOR

WHITTIER NARROWS FUX)D CONTROL BASIN

SAN GABRIEL RIVER IMPROVEMENT

U. S. ARMY ENGINEER DISTRICT, LOS ANGELES

CORPS OF ENGWEERS

MAY 1963

LOS ANGELES DISTRICT

LebBN IS, U30-2-22

U, S, ARMY ENGINEER DISTRICT,

EOS ANGELES, APRU 1963

1. This manual prescribes standard procedures for the operation and d t e n a n o e of the federally constructed Whittier Narrows Dam, San Gabriel River Improvement, California. A l l previously issued operation and main-tenance manuals for this dam are superseded by this manual.

2. Preparation of this manual is s responsibility of the Dams Section of the Design Branch, Jhgineering Division. Suggested revisions should be fozwarded through channels t o this section, FOR THE DISTRICT ENGINEER:

S&TON B, BILES

bjor, Corps of Engineers Assistant District Engineer

OPERATION AND MAUTWMCE U N U A k mR

SAN ci4mmL m m dPbPm-

SECTION INTRODUCTION

A~thmili~tio~~ee ..eeaeeeoeeeeao.. e a a e e o e e ~ e e e e e e a e ~ a e ~ e o

Project location .................o Desmiption of project Protection prodM Design analyses Collqtmtion M s t m Foundation of d9msite ............~...................~.

Pertinent data Bemeational development. ...................e....e....~

................................... Approved regdatiom Purpose af d

. D & W t 5 a ~ e . o * * e * * ~ * ~ * e e * * ~ * ~ e e * a e e a * e ~ e e e o ~ e ~ a e * e * e e e

Reference drawings anil n]~nds. a..........e......~..... ................ Functions of the Construction Di*on.

Func)tions of the Engineering Division Functiions of the Real Estate Division .................. . Functfom of the U S . Geological Survey Inspections and ............................ .... a. By the Constwtion and Engineering Division b . By the dam Lend= eeeao.eee..eo~eee..aeooeo.ae.e .. Safety Branch wpect%m. 6 e e e e e e e o o a e o e e e o

Duties of the dam taazder.. oee e 4 a e a e a e e o . e e e . e e * m a a e e ..a

Routbe test spera-tiena SECT16115 3 . lB'Q3NmT AND D M TXXDWs S HOUSE

................................ D B s C ~ ~ ~ ~ ~ O P L OT a f b e E n i b ~ ~ ~ ~ t j . e ~ o ~ o ~ ~ . r . c o e ~ e a e e r , s e ~ o ~ e o m e e e a ~ a e e e e * e m . e e a

~ ~ e ; 8 ~ ~ 4 ~ ~ o 4 ~ e r . ~ ~ ~ e o a a o ~ ~ a 4 o c o c o e ~ o 4 o o e o o a c ~ o e 0 ~ c o o

ACCBSS F Q ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ . ~ ~ . ~ . ~ ~ ~ ~ . ~ ~ ~ .*.ee...e*.*

F ~ ~ ~ ~ e a e o e e a o e o o e o e e c e e * e e * e * e e a e ~ e * ~ * * ~ e ~ * * a * * ~ * * . * * * ..................................... Dam tender's h-8 Inspections and maintenence... ....4

a. W m e n t s b . Dam tender's house

c. Conmete m d ripap .....................~.~.~...

do Access roads asldbe~,e.b.eB.lea.e.a~.oB~.e.~~~

e. Fenoes ................a.......................~~ f . BmoWhg g, Hhmdou8 ob~tmtions.~ ..OO.............e

TABLE 0F COIITNTS--Continued

Paragraph sEcTIoN b - oUTLET i,foRKS

D e s c r i p t l o l l e r r . . a . . . . . . . . . . . . . . . . . . . . . . . . . r Approach ehanne]... . . . . .. r . . . . . . . . .. 6 . . . . . . . . . ., Outlet stnrcturg Control room and ggnef,ator room Dowrstrgan ctunnel Subdrglrra$€o r r a . a Divgrslon condul t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , .

InspectLons and rngi-ntgnancgr

4 t C b a n n e l S . a a . . . . r o a a a . a . . . . c . . . . . . . . . . . r . . . . c

b. Wgepholes a . . . . a . a . . . . . . . . . . . . . . . . .. o . . e . o co FIep gat 'es in nenbolgs.. a. . r . 6 c. 6. . c 6 6 . . . . . c c e ! 6 sEeTI0N 5 -- SPILIITIAT

D e s c r i p t l o t l r o . . . . . . . . . . , . . . . a . . . . . . . . . . . r A p p r o a c h c h a n n g l r F l o a t l g g l L l n t a k g . . . . . . . . . r i c . c e . . . . c . e c r e c o e e o . . c Sp i J lway con t ro l ho t r so . . a c . . € c . o c , , o c ca . a 6 6 o o 6 .6 . , , 6 c ca D o m s t r g a n c h a n n g ] . . . a a . . . | . . . . . . . . . . . r . c Spillway dratnage syitgn.. . . o .. . .. . . . .. .. . . . .. | Inspectlons and lf,alntenancg

SE0TION 6 - CnCnS AND HoTSTS

Otrt let works gates - gcneral featweg.... . . .o... . . . . .c Outlet wo"ks gates - lnochafiical equipmeoto..oooo.coc..

Ortlet lrorks gates - electriaaS, equiprnentoe 6o6cc6e6o.€ Spt l lway gatgs - genera l fgatures. . . . . . . e . o . . . . . . . e . . .

Sptllway gates - autonatlc trydraullc equlpnent Sptl lway gates - meehrmical equlpnent... . . . . . . . . . . r. . .

Spillrray gates - electrical equLprnent Spl l& lay gates - operat io t r lo r . . o . . . . . . . . . o Gatg control stationg. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . .

Inspection, tests and naintenanee... . . . . . . . o

& r G g n g r e - l . . . a a a . o a . . c a a a o . a . . . . . . . . . . . . . . a . . . . . . . c b . T a l n t g r g a t g s . 6 . 6 e . , . . , 6 . 6 c c o o a o . c o o a e a 6 . o o c o 6 G c o , C o lloists . a . . c . o . o o o . . . c e . . 6 a e o . . . . . . . . . . . e . .. c d . t hu r rdon bga r lngs " . . . . . . . . . . c 6 . . . . . o . . a . . . 6 € r W d r a u l l C t g S t f . P a l n t i - n g . . . . . . . . . . . . . . . a . . . . . . . . . . . . . . . . . . . o b-r L-r h-r h-r l+-z l+2 h-z h-3 L-3 h-3 h-3

5-1 5-r 5-L 5-2 5-z 5-3 5-3

6-t 6-1 6.1 u2 6-2 u3 6-h G5 6-, c5 G6 G6 6-6 6-6 G6 G7 r1

Paragraph

TA3I,E 0F C0]lTm['IS--Contirnred

Paee

7-1, 7-L 7-2 7-2 7-2 7-3 7-3 7-3 7-3 7-b 7-h

8-1 8-1 B-t 8-2 8-2 B-2 8-3 8-3 8-3 8-3 8-l+ E-h 8-h E-l+ E-h 8+ 8-h

9-L 9-t 9-L 9-L 9-L

J sEcTIoN ? - ELECTRTCAL.FACITTTIES

G e n g f a l . o . a . r . a . a . o o . a r c 6 o 6 c 6 c . . , o o o 6 o , . . o . . . a a a

Piesel , generator un i ts . . o o. . . o . o Generator control switahboard.. . . . . . . . . . . r D u c t w o r k a a a a a a a a a a a a a a a a . a a a . . a a a . . a . . . . . . . o . . . . . . . . a Bridgelights and floodl J-ght8r c r r o rnspect ions, tests and maintenarce.. . r . . . . e. . . . . r c cc c6

8 r G e n g f a l . . . . . a . a . a a a e e e c . a . . . e . o . a . . o o . . . e . . . . . a a

b. ELectri-cal supply and serrricgsc o d c c..6 c. ... . ,. ..

c1 D tgsg l genera to r un l t s d . $r l tchboard arrd } tght f fuchj res. . . . . . . . . . . .o oo operation of electrfgal fgg' i1' l t les... . . . . . . )

SECTTON 8 - ffiDRO@API{IC INSTAT,LATTONS s t ' a f f $ a $ € 9 c . . o a . . c o . a . o . e . . . . a . r c o r . r . . r . r . , . o . . c 6 o 6 e Resgrr ro i r watgr s tage rgcordgns. eo. . r . c Gato positton rgcorderg. . o o . . . c . . c . . . . . . . . . .. . o Gate positlon indicatorg " . . . . .. . . . . . . . . . . . . . . . . . . o Gaging s tat ionE. . . . . . . . . c . . . . . o

Elr Rio Hondo below Garvey Blvrd

b. Bio Hondo beLot Whttt ler Na,mols Dan oo San Gabriel Rj.ver at North parkway Bridgeocq666c dn Flood flow c?ran'eL at Roeenead. Br:ldge €c Misslon Creek beLow Whitt ier Narto,1i.o

Standard raln gagego e c o e e . e c . . o . . . . . . . . . . . . . . . . ) Automatic raln gagggo r r r 6 c o . . .. . , . . . . . . .. . | . .. o Se&i:ngntation monuments. u . . . . . c . . .. . . . . .. . , Inspec_tion, serieing, maintenarce and reportlng....o.

8 o B y t h e d a n t g l d g r . o o . . . . . . . . r . . f . . . . . . . . . . o . r . . .

b f By the U. S . Geo log ica l suwey. . . . . . . . . . e e . . e e e e cr By the &rg ineer i lg D iv is ionc .c 6 . .c o . c co . r . , ,o oco

SECTTON 9 - COMI,IIINTCATION FAC]LITTES

R a d i o S t a t l o n " r e s r 6 € a o o o o . . o o . . . . . . . . . . . . . . . . . . . . . . . . , Telephonego

" " o o o o o e o . c e c c . a . .. . o . . . , I {a ln tenance of rad io fac i lJ t ies. .n . .c . . . . . . . . t Te lephone ma j r r t enanc€ r o r " . . . . . . . . . . . . . . . . . . . . . . , . . , . . .

Malntcnanec of, lntercormruricatlon telephone servrce...

:.Lt-

SECTION 10 - C W W AND UTILITIES

G81~~~s..rr.c.e.s.o.s.a.r.....oeeaeaeeseeeeeaeeeaeeee

$an Jose Week Diversion C ~ e l , . . . e e . . . . . . Q . e o . o e e o o Flood flow ch;mnel..a........................~oa600BQo Rosemead Bid, reloca%ion,, . . . . . . . . . . . a . . . . . . . .. a .. a*.

a. Rssermead Blvd. brfd~e................~.....~

b. Drop etruct~e........~..~...................~~.

Sari Gabriel R i v e r approach ~~el,.~.~...........e*.~ R i s ~ 6 r ~ d 0 approach c ~ e l . . , . . . . . , B . e . s . a B . . o . . . o B e . .

Mjlssioa Creek els scat ion,..................^^^.^^.^^.^

a. Description ,,.., e..,C,...me.a. ..... e....0QeBoeQ8a

b. Operation of mssion Creek c~rmdullt~....~......~~

Q t ~ % i e ~ . . . . . . e e ~ e ~ c o ~ ~ . ~ o ~ o ~ ~ ~ . * ~ * ~ ~ * * e * * ~ * * * * a a a . ~ * a, LOB Bngeles Bureau of LLght & Pmer..., b, Southern CaPjfmnia Mieon Ccapmy.o..........a.

e, City of Whfttiier & Cate Pitch C a m p a y 8, Wh%ttier Water ~~ & Wtr0politan Water =st.

@ c B ~ C Q R D i k k C ~ ~ ~ e . e e a . . e e . e . e e a ~ e o e a a o e a e , a e a f, PeUssbe-r Water Cornpamy S i p h ~ n . . ~ ~ . ~ ~ ~ ~ ~ ~ ~ ~ . ~ ~ ~

g. CaBUtn%ia Desaheatic Wa%er C @ q m v a d t ~ . . . r 0.

~ ~ B ~ ? ~ C % ~ O I I S itlld ~%~~~~ee.o.a.ase...creo.aaea..ce*

SECTION XI. - kIA!EB SUPPEP AND SENAGE

Outlet wmks arid spillway con%rloP houses.. . . . . . . . . . *. d Dm tender" h~e.~,....,~........~....~......~.~ peet ti om, tes$a, and XIEL% C Q a e ~ a e a e e ~ e ~ o . . . . . ~ ~

O e & ~ 8 & 5 1 . a o a e o e . . . e . , a . o e e ~ r o e . . r . e . e b be Fkre hoses and b&bb8..,.,,......e........,.eeea, e, Firs g~eventisrm,,..............~..~~.,~..~~~.~.~ bcident p ~ ~ ~ ~ ~ t i ~ ~ ~ . ~ ~ ~ ~ ~ ~ . ~ ~ ~ . . ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Project location General plan List of drawings (12 sheets) Spillway-Diagrammatic' ske%ch Lubrication chart Inspection cheek Pist (new) Test operation report Whittier Nmowe Dam Recreational Area Drawings (unattached) Reference manuals (unat-bached]

Instructions fo r operation of serv5ce gates Buda - h s t ~ u c t i o n s f o r operating and servicing

Hodel &A-779 Bud8 - Instmctionrs fo r operating and servicing

Nodel &D-273

* Waukesk engines, operator8s -manual * Alternating current generators, maintenance and service manvd * Safety requirements, EH 385-1-1, Corps of Engineers, u, s, (=t-t;&e~ba)

* All erLhrhbi%s, which were par% sf the previous Operation& IIaintenance I'IanwP for WhitLber Nmows Dam, are s t i l l applicable and s h a l l be included i n Lh ia f h l m u % % w2th the exception of previous exhibit E - Hydrographic ~a%$ng cmves and gate operation s.chedule.

Plates Nos, 1 t o 5 are bebg geriodicaZly revrised and distributed by the Hydrology & Resemoir Regulation Section of the Engineering Division, Therefore, they have been omitted and substituted by a plate showing the FJhiLtier Xarsobaa Dm Recreational Ilsea.

QPHtBTPOIt mTE) MAINTENANCE MANUAL

FOR

SAM GABRIEL RllTER m R O m T

WHITTIER NARROWS FLOOD CONTROL BASIN

SECTION 1

1-01, Authorization, The flood control basin at W h i t L i e r Narrows was included as a u n i t of the comprehensive general plan f o r flood control i n the Los Angeles County Drainage Area, California, as pre-sented i n H.D. 838, 76th Congress, 3d Session, and authorised by the Flood Control Act approved 1b August 3.941 (public Law No, 228, 77th Congress), 1-02. Project looation. The Whittier Narrows flood control basin is located near the center of the south s ide of San Gabriel Valley in the vicinitiy of a natural topographic obstruction known as Whittier Nmows. The sits is appro-tely 3 miles south of the tawn of E l Monte, 3 miles northwest, of the town of Whittier and approximately 7,s miles downstream from Santa Fe Flood Control Basin, The general location of the project is shown on drawing, f i l e No, b62/2, exhibit Fo

Between Whitkier N a r r s ~ w s and Santa Fe F'lood Control Basin, San Gabriel River flows through the central. par t of the valley w i t h an average slops of a5ou-b 30 Feet per mile and col lects run-off from the eastern haLf of the valley. After passing through @he narrows, the r ive r traverses the Coastal plain f o r nearly 20 mile8 and empties into the Pacific Ocean a% Ahmitos Bay near Seal Beach.

Rio Hondo, formerly a distr ibutary of San Gabriel River, originates near Santa Fe Dam a ~ d flms roughly para l le l t o and west of San GabrieX River, collecting run-off from the western par t of the valley, The stream flows through t h e narrows appromrimately 6,000 f e e t west of San Gabriel River and continues sou~kmesterly across the coastal plain t o join LOS Angeles River approximately 8 miles below the Whittier p 3

Nasrows Dam site.

San Jose Creek r i s e s i n the efirene eastern end of S a ~ l Gabriel Valley and flows south and west between San Jose Ells and Puente Hills t o join San Gabkf e l River, 1-030 , The p r b c i p a l s t ructure of the WhSt%fe N in is an earthfill dam, approxi-mately 16,960 f e e t long and 56 feet high (maxlnnun), with a relrrforced eoncrete.mLle'e s t m e t a r e lrnavhg Tainter g a b s t o control discharges through an improved Rio Hondo clmrmel into lower Lss Angeles River, and a reinforced concrete spi13.way structure having Taintex gates to control discharges into the channel of San Gabriel River. The flood, control basin formed by the dam has a capacity of 36,100 acre-feet and an area of 2,h70 acres a t reservoir design water surface elevation 229 e 0, Bppwtwmt features include the flood flow channel between the Rio Iiondo and San Gabriel River channels just upstream from the dam, improvement of short reaches of the channels of Rio Hondo and San Gabriel R i v e r within and immediately upstream of the reservoir, and the San Jose Creek Diversion Channel. (See drawing, f f l e No. l46/5, exhibit F), Pa accorsd;mee with authority received from OCE, a conservation pool of about -1,000 acre-feet is developed, during s t o m runoff, above the Rio Hondo outlets t o elevation 195.5 f o r downstream spreading by the UCFCD. (See ReservoSr Regula%ion Eanua9 for Whittier Barrows F.C .

Reservoir)

I-Ok. The project was designed prbmrily to protect esident-lal, urban, and conrmercial development along the l&er S& Gabriel, ~ i e r a d - the Ria Hondo edendhg across tkq coaaW plain from W t t A e r Narrows to the Pacifio Ocean0

The design ~equirements fo r Whittier Narrows were based on affective control lhg and passing the reservoir and spillway design floods.

Since the spillwag oan pass a nwchmu flood 30 percent larger than the spillway design floocb, "te s&&y factor against overtopping of the dam is censemtive. Floods k g e r than the project design flood would be rare, 1-05 . Detailed descriptions and computations are given ses of Design and reports on GabsLel

~ o l & I and. - Design Ccqmkti?ns fo r Contract No. 1, Spillway ., and ted January 1950, Volume I H - Addendum A - l%.ssion Creek and Sewer Relocation, dated Beeder 1950, Vo3.m~ IV - Addendm B- Rosemead Bodemvdl and Workman Mill Rod bridges, dated July 1951, Bolme V - Addendm C - CenLrd Enibanlauent, Channels and Rose-mead Boulevard Reloca%i~r!, dated April 1952, Volme VI - Addendum D - Tahbr Gates md Accessorfes, dated ~?ove&=

'Volume VII -.Addendum E - West R u b h e n t and h t l e t Works, dated Febrrraazcg 19%.

Design Memorandum No, P, Outlet Works, Concrete for Outlet Structure dated February 19% ( ~ e v )

Design 'Menormdm No, 2 on San Gabriel River Improvement - lMt%ier Narrows Flood Conta?ol Basin - Embankment Relfef Wells, dated Sep tmbr 1955 0

Oonstruction Report on Bnbanlanent ReUef Wells - Whittier Narrows Flood Control Reservoir, dated July 1956, Foundation Report on Outlet Wmk% - WktttLer Narrows E'lo~d Goratr01 R e s e m b , dated July lS6 .

Foundation Report on Spillway - Whittier N a r r o w s Flood Control Bash - Sam Gabriel River ~ o v e m e n t s - Las Angeles County Drainage Area, dated July 195;.

1-06, Construction history. Copies of the c0ntrac.t;~ fo r Ssn Gabriel R i v e r fnrprov8mnt. Whitgier Namms Flood Control Bash. are on f u e in tb c?f~ce of %he U, S. Lrqy Engineer District, Los kngeles.

P e a t data on %he magor contracts are as follass:

a, East Rnb&nt and Spillway

Contractm: Winston Bros, Coo Contract N d e r : DA-04-353-ENG-227 lhrk started: 16 I b c h 1950 Work sssqhXeted a d accepted: f September 1 % ~

Con%rac%or: Am Teicber* & Son, k c . and Bressi & Bevanda Construction Co~spar~r

Contract Muniber: DA-04-353-ENG-227s Work started: 13 October 1952 Work c q 1 e t e d and accepted: 12 March 1953 c, Wes't Embankaent and Outlet :arks

Contractor: A. TeicBert & Son and Me J. Bevanda Contract Nuniber : DA-04-353-ENG-3601 Work started: 30 I&roh 19% Work completed and accepted: 29 March 1957 d, Tainter Gates and Accessorieq -- Contractor: Guy F. Atkinson Contract Number : DA-04-3~3-~63-31~7 Work started: 18 November 1%3 Work completed and accepted: 27 January 1956 e, Rosesnead Boulevard Bridge

Contractor: Bymts & Sons and George IC. Thatcher Contract Number : DA-04-353-ENG-1868 Work started: 15 April 1952 Work completed and accepted: 1. December 1952 f, Warltman E l i l l Road - Bridge

Contractor: M. B. Nicholas Contract Number 2 ~~-0k-353-ENG-Pt)63 Work started: b April 1952 Work completed and accepted: 31 October 9952 go Mission Creek Sewer

Contractor: dlrtukovich Bros,, Ino.

Contract Number : DA-Oh-353-ENG-1038 Work s b t e d : 5 A p r i l 1951 Work completed and accpeted: 3. March 9952

h. Relief-Wells D

Contractor: Roscoe Hoss Co, 8t Me R. Peck & Sons Dr.1"Leitng Co, Contract Nuuiber : ~8-04-353-CmG 56-27 I~rork startedt 28 Octpber 1955

, Work completed: 29 Eky 1956

1-07, Foupzdation of dam sfte. The founda%fon f o r the ernbd-suer& consists mostly of dense desosLts of sand and mave lwl t l~ as-eonsleeted lenses o f silti and l e & ~ clay. &cep% f o r a relatively thin mantle of dry material, which remains above the water table, the foundation materials are saturated with ground water, which may be expected t o r i s e t o the mwface d m h g periods of heavy r h f d , 1-08. Pertinent &$%a

Drainage Area S w e k?iLlss Reservoir Design:

Enflow volume, & days Acre Feet =low peak e.f ,so Qutf10W geak ~ e f a ~ e

(~ontirnued nexb page)

, Pertinent data (~&buedl)

E.riaxLrmun flood control pool elevation Ft. m.s.l, Spillway Design:

lraflow volume, 4 days Acre Feet Inflow peak c.f .so Outflow peak c.f .so Design surcharge on gate S U B Feet

Flood Control Bash:

Area a t elevation 229.6 Acres Capacity at e l e v a t i ~ n 229.0 Aore Feet Area a t top of dam, elevation 239.0 Aores Capacdty a t top of dm, elemtion 239,O Acre Feet

Dan8 T$pe ' Rolled Earth Top elevation Feet, m.s.1, Height above streebtnbed (890 ond do) Feet Length of crest Feet

Outlet stmc%ure:

Type of gates Number of gates S h e of gakes Feet Size of gate openings Gate si l l elevation Feet m.s.1.

Gate h~adwaU, boktonn elevation Feet m.s.1.

Regulated ou-bflcrw ( s e s m o f r water surf ace between elevation9 207,7 and 229*0) c.f .s.

Free floaa capacity c.f ,s.

lkximm earpacity ( r e s emk wabr ~~p%effme a t elevation 229.9) c.f .s.

SpUlway atmatwea 'Type of galxis Number of gates Si&e of gates feet ~ a 6 e si l l @levztion f t . rn.s.1.

Discharge capacity (rese~woir wa%m surface elevatf on 234.0) c.f .s.

Naximum dbsclnarge capacity (ressrvob water surface elevation 239. Q) c,f .so SpiXkway cWb 'b r

Width f ee t Lemagth of sPopLng apron fee% Slcspe Wall height fee% Denta%ed sill, heigh% fee t

Tainter nine

50 x 29 200.0

%-09* Recrea%iod devel~pmen&~ Under the t e r n sf a 50-year recreational Pslcense executed in June 1957, 1,161.43 acres of the t o t a l project acreage of 2,889,O w i l l be developed and maintained for public recreational aotiviPlfes by the Parks and Recreation Department of the County of Los Angeles*

3. .lo. Watem reclamation plant.

The County Sanitation District of Los Ilngeles County is operating a water rec&tion plant t o produce a high d t y effluent which is-returned t o underground aquifers through spreading basins. The Sani-tation Districts have an operator a t the plant every day be%ween 8:00 A.N, and 4830 P.M, The operator w i l l contact the Corps of Ebgineers by kPe-phone regarding water surface elevations i n the reservoir, When the water s urfaoe has reached elevation 195.0, he w i l l prepare the plant for possible shutdom, When the water level r ises to elevation 203.0, he w i l l shut down the plant completely and leave the basbo

Note: The WFCD w i l l periodically ascertain the water level i n rekL& wells and w i l l forward the reports of water levels t o the Corps of Engirawrs * a, Project Operation P'Isintenance W d e - EE4 U.30-2-303, 20 J m e 60.

b,' Emergency Flood Control ActSvities (under PL ~ 9 / 8 h ) 40011-1, AM= BL,EJovemb~ 1962, e, Mot- VeMcPe Inspection - Technical Wnual 38-660-1 Operator's W t e m o e ~ t m c t i o n ~ and Procedures fo r Administrative Plotor Vehicles, d', Pire Prewntion Code N.B ,F.U, he project Ope~akion l!bmd,s EM 1130-2-3&, dated 1 1962, j . Ra&eX~@ed Recovery Operations, Amex D, B4 500-1-1, February 1963,

k. Liceme f OF Park & Reareational Purposw No, DA-04-353- CZveng-57-bb98 Tor Wxlttf er N W W S ~

2-02 . The purpose of this manuaJ. is t o supply the dam ten t operating personnel wit11 :'Lnstructions f a propep inspe6%iong opera-bion, and maintenance of the kJhittier Narrsws Flood ~ g n t r o l Resesvo~, These instsuctions w i l l insure the continuous m a d a t e m e of b t m t u r e s and equipment and their operation in such a m md 8% ~ u c h %Wes as will obtain optinnun benefits, 8 ~ c U z e d t e r m used iu this manual a m defined. as f l%ngJsaeering Divisionff , flConstructi on Division" and '%dl Zstate Divisionn refer t o organizations within the U, S . Amy Engineer District, Los hgeles. (b) nFlood seasonn refere LO the per5od f ~ o m 15 October 60 15 A p r i l . when most past floods have secwed, (e) tlWrgency ELooeE Condit2onfl refers t o periods dlaa~bg which the reservoir water surface r ises above the crest of the spi l l -way a t elevation h96a ALL slevat20ns refer t o mean sea level datum.

2-04. Reference drawh~s and manuals. Drawing f i l e n d e r s fn this manual refer t o "as constructedtv drawhas - half-sLze reductiom are included as Exhibit F and separately bound, Drawings, manuals, and instructions of manufacturerst e w p e n t are l i s t ed in I3xMbL-b 6 and are on f i l e i n the Distr ict Office and a t the project.

2-05, Functfons of the Construction Division. Operation and mahtenance and a l l hspections a re under the supervision of the Construction Division, with the exception of those fo r hydrologic installations (see Section 8). The general duties include the following:

a. Key personnel shall be tralned in order %ha% regular inspection, operation, and maintenance work w i l l be performed efficiently and t o insure that unexpected problems related t o flood control may be handled i n an q ted i t ious and orderly manner. The men sha l l become familiar with the provisions of this manual, the construction specifications and the "as comtmctedn dlrawbgs,

b. There shall. be no encroachment or trespass wlidch w i l l adversely affect the eff icient operation or rwhtenance of the project.

The Chief, Construction Division, shall therefore cause notices t o be posted a t con~picuous places along the project right-of-way direct-ing public attention t o this requirement and he shall arrange fo r the prosecution of offenders and report actions W e n t o the Distr ict Engineer. AU trespasses or rLolations of outgrants discovered by construction division personnel BMU. be reported to the Re3 Estate Division,

c. The Construction Division re iews plans and f u m i s h e ~ comments t o the Real Estate Division on requests from public or private interests fo r c o l l a b r ~ lase of land and water areas, and performs inspesti_ons during construction t o a s m e compliance with approved plans.

d, The Chief, Cowtmctisn Division, shall establish a f i l e of a l l reports and records concerning the maintenance and operation of the projest works, 2-06, F'unotiom of the Ehgheering Bivlesion.,

a. The Ehgineerhg Division performs engineering reviews of a l l plans and. furnishes engineering comen.I;s t o the Real Estate Division on requests from public or private interests f o r collateral use of project lands.

I be It conducts priocklcd condition m e y s of the project, These srulreys serve s two-fold purpose: (1) t o ascertain the condi-tion bf thb various parts of the project and (2) t o see if a l l the pepairs and improvements have been carried out that were previously secomended.

c, 1% shasf also t ra in key personnel in the operation of service gates, hoists, standby power units and communication f aa i l i t i e s

4 \ and h the operation and maintenance of hydrologic installations and w flood-fighting equipment, They shall become familiar with thfs manual, t f ae h e x A t o EPfl 50Q-1-1, P a r t 1, the Reservoir Regulations Manual, which is redsed perie&cal9y, and the Itas constructed drawbgs, d, It prepares anal executes all flood-fighting p h s and tbrough the Hydrology & Reservoir Regulation Section, directs the dam tender or his assigned alternate i n the operation of the gates, It keeps records of reservoir stages, inflow t o the reservo*, releases through the outlet stmctwers and spillway overflow, e, The Ehgineerhg Division is responsible fo r the hspectfon, servicing and nainbnmce of a l l hydrologic installations, Their routine i ~ p c t l o m are done by the dam tender,

f. The eupePVqaion and maintenance of radio i n s W t i o a e is also a function of the Engineering Division, 2 4 7 * kcstions 02 the Real E~state Division.

a, me R d Estate Division processes alL permiter, bicemes, easements, or Xemes through appropriate channels and administers ~0lfIP~~bd. h ~ ~ ~ 8 ~ t ~ e b, Et ixmxres csqUance %bough periodic inspections and aqts upon violatiow of mtgran~s,

e. It furnishes t o the Construction Division copies of all p e d % s , Ueemss, easementis or leasese

2-08, Fmc%ions of the Ug S, Geofogical Survey. By ae;reement beixeea the O w of EmglPleexs and the U. S, G. S ,, the l a t t e r w i l l

A service the mtflcm gaging tati ion, make discharge measurements and

J o o q i l e and pubUsfi the outflow recoxds i n the U. S, Geological Water Supply papere e

2-09, b p e c t i o n s and maintenance.

a e * Periodic 5mpac Division, Engheerfng Diesion, or his authorized representative, as required, I i n order t o determine maintenance measures necessary t o insure service-ability of the works in t h e sf flood. Such inspections s h a l l be mada I immediately followSng each major highwa'ber period, and at intervals not t o exceed 6 months and a t such tlmes as may be necessary. Immediate I steps shall be taken t o correct dangerous conditions disclosed by rsuch inspections and regular maintenance repair measures shall be I acconrplished during the appropriate season as scheduled by the chief of the division. A l l repairs shall be made i n accordance with I standard engineering practice, t o l ine and grade and i n acc~rdance i, with details shown on *as e o n s t r n ~ t e d ~ ~ &awbgs, M i b i t F, I

b. By the dam tender, Periodic rou'bbe inspections of structures and equipment and of the project area shall be made by the dam tender or his assistants to determine maintenance measures that are required. These inspections during the non-flood season shall ?m made at intervals of not more than 90 days; during the flood season, beginning 1s October, a t intervals of not more *than 30 days; also immediately following each flood, More frequent inspections s h d be made if required fo r the safeky and efficient maintenance of some features of the project. During each inspection, items r e a m ing maintenance shall be checked and described on the inspection check lists Fncluded as I3ihibi-b C. After each inspection, one s e t of the inspection lists shall be promptly submitted t o the Chief, Maintenance Section, who will route it t o the Design Branch, Engi-neering Division; one 8et shall be mbmitted t o the Chief, Operations Branoh; and one se* shall be retained by the dam tender. 1Wntenance shall be performed by the dam tender if feasible. If rraaintenance requires hiiring additional labor or equipment, the dam a d e x ? shall submit t o the Chief, Operations Branoh, a list sf proposed maintenance measures. Normal &tensnee s U be made uLthout delay d w h g the non-flood season.

i

6. Safety Branch inspection, A l l . f i rs t-aid act iv i t ies i n come@%ion w i t h flood emers~encies are under the supePPisiorr of the Chief, Safety Branch, ~ t t h e beginning of each fiood season and periodically thereafter, as required, he w i l l inspect the project, see that proper equipment is a t hand, and see that the dam tender and his assistants are adequately ins2,mcted i n f irst-aid procedures and safety. Appropriate equipment includes (but is not limited to) standard first-aid Mts and such items as blankets, stretchers, safety belts, l i fe lines and kapok vests. Grappling ixons are p~svided from the base yard and gas detectors and oxygen deficiency h p s (WOU lamps) are provided by the Las hgebes Dfstsist Offios, (see Flood Emergency Manual, par, 6,061

2-10. Duties of the diur- tendere The dam tender or his assistant is required t o perfom the following duties:

aa Be p s e n % at %he dam when r&mf%U .or runoff is O C ) C ~ U T ~ ~ .

b, See that a32 e@.pmnL at the $p9s jeet, includin?g recordbg and h d i c a t h g gages, gab mechanism, power units, raclia, etc,, is ill ogera.e$ng ~ ~ i l a d % % f ~ ~ a a

d. Opmate the g a b s in accord.ancs with instructions from the Fiydrology G; Resemo5.r 2e&tfons Section.

eo FolEm the fixed gate operation schedule posted in the con'trol h m e Jln %he &amco of c o ~ c a t i o n s wit11 the Hydrology & Reservoir Regulation Section or jtGb t he absence of a representatLve from t h a t grape f, Serdee CLfg gages and recordersd wind the clocks, w u lWI3 Z'@CQ~P& pQ+l', e k * g, Chard %he progec% a g a b s t v-sm, sabotage and f i res .

h, O w d ag-% unsafe conditions in the project area.

%. Repopt on %res~passgxlg and encroachment of right-of-way, 3, fkhtaiPh rou%he re66*, including water surf eleva%%ons, outflow gage bights , p e e i p i h t i o n amounts, gate openings and logs on prescribed form, The d m "sender shaU coope~a%~ with the LQS h g e l s s County Flood CoxaLrol Dis%r$et as $oUma:

a, %he UmGD awns %Ires 32-ft, high power-operated t a in t e r gates f o r d i v w ~ h g water from the Rio Rondo channel in to t h e i r spread-ing gromcb, The gates w e l o w b d jus t below the Union Pacific R a i l -roado A W e c l interphone Une omed by the UCFCD connects the out le t works cot;poI home wikh a con%rol house f o r t h e b ta;bnter gates, b, If the UCFCD are eonductbg spreaang operations, the tian tender shall raotuy %laem of any expected changes i n releases of water though %he Ria 1J.ondo outlet works gates so that thefr rnag adjust the* W n t m gates, 5X necessary.

e. 23 the U C F C D we not conducting spreading operatiom the d m b d e x shall check t h e b t a i n t e r gates visually t o see tf they a e in P'open" psf%i.on before he makes any increase of flow through the outle$ W O F ~ , 2 Routine t es t opmationse The d m tender or his assistants shall test-owrate the service nates and electr ical f ac i l i t i e s fn the control house every 30 days and-the standby power unit every 15 days, Test operation reports (Exhibit D) shaU be completed in t r ip l ica te af ter each test . One copy shall be promptly subdtted t o the Chief, EngFneerhg Division, one copy t o the Chief, Constaction Division, and one copy shall be retxined by the dam tender.

SECTION 3

~ ~ ~ J T AND DAM TEi'dlDS1;TC9S HOUSE

%-ole A% W % t i a r &LS?F~S t11e basin of San Gabri~f leas khan 2 miles in width by h e n h Hills on the southeast and La Hercod Hills on the nos tbes t . hi valley f loo r w i t h i n the narrows is roughly trapezoidaB An shape, bounded on the southeas=b by 3 miles of hsn'te Wills and on the nortlnssst by approxi-mately mL3.e ~2 La Nereed UB, The range of surfscs elevation in the valley f loor within t'nis area is f ron approximately 18L fee% along %he southerly edge t o approximately 250 f ee t a% %he ac.$reme nostheasst corner. East of the valley f loor the ground rises on the slopes of h e n t e 'Hills more than 800 f e e t w i t - a mile, while on. %lie west La Merced Hills r i s e only 300 f e e t in a U e dis'emce, A 2-d1e reach of Sari Gabr3.elRive.r flows south-westerly through the east-centirail par t of t h ~ narrows and is Joined mi&ay by Sar~ Jsata Creek iBsoaa the northeast.. About a mile farther west Rfo Rondo s&ts tihe toe 02 14mced Kills and passes through the gap in one c h g reach less %lmn a mibe in lengtho

Tlae axis of ' e h ~ d m is located roughly as a diagonal joining:

the smtWes t a d nosptItneas% eornsrs of the 1;rapezoiM valley f loor within the nmowsQ B s g b h g a t t h e sou%b slope ~f La 3krced H i l l 6 a% a p s h % where Rio Bowdo has diverged about a quarter mile f ron the toe of the U s , %he of the dam croasee a fo Hondo on a sweep-ing eoncave ewva and crosses Basemead Boulsvwd approximately 4,500 feet sou%h of Siphon Road, F r ~ m that, point the axis continues almost due east to S m Gabriel River where revarse, curves ;In the aUnernen.1;

permit Qe)ca%im of %la8 spfUway stmctwe at r ight angles t o stream flaw, C h g j a g direction agah Just beyond the east en of the sp i l l - t way, the a x t s colat3nues nmtheasterb t o its t$&us o t11e high g~ouz%dl btween S m %rabr%81 River and S m Jose Creek, (see drawing, f fie No, a6j5, e f i b i % I?)

3-02. m b W e n % , The emb asctlsns 02 the =st and central.

~ ~ e ~ % cona%a% 02 a sekzi-rd bLpersl.Ious core, an upstream and down-stream pervi~us zoneg a korizomatd b f select pervious materjlal beneath the doma%z°em %&d of the e nt and a downstream toe &a, The s& mt section f o r the west embardmen% is s i r ~ k that deaaribed abow except th"c additional pervious zone is added beneath %he upskern t310pc3 pr~%ee%ion~ '%he upstream slope proteelhion aonsfsts of a s'eoese blaslee-b, 2 fee% thick, extending from tihe b p of %he dam to about 3 Zest below the ground surface. The facing is tdfaderhln by a filter blanket, 1 foot %l.l$ck, in the eas t and- central e&mhmn%a and 6 inches thick %n 'the west embadanent.

(FOP p h , prsf%$e and srections sf the eas t e~nbdment, see drawhgs f i l e Nos, 462/12 and 462/13; fo r detai ls of the central embankment, $ee drawings f i l e Nos. 463/13 and 463/&, and fo r detai ls of the west 1 emb&nt, see drawings f i l e Nos, fi6/l2 and Ut6/13, &bLt F)

3-03. Drafnage. The ernbanhen% drainage system consists of b o component parts: (a) a horizontal drainage layer of select pervious materm, exbending from a point 12 f ee t from the impervious core t o the downstream toe of the embankment, at which point a perforated v i t r i f i ed clay collector pipe is provided, and (b) a l ine of 132 re l ief wells spaced a t $LLfoot centers along the downstream toe of tb embankment. The re l ief wells are 50-foot deep and 8 inches i n dia-ineter, They are connected t o the toe drainage system with 6-inch v i t r i f i ed clay pipe, A number of manholes are spaced a t appro-dmately 300 foot intervals close t o the relief wells. Outlets have been provided in to the Rio Hondo, llission Creek and San Gabriel River, or drainage detai ls see drawhgs, f i l e Nos, a6/12, l46/13, 462113, 464/13 and 46c/l4, exhibit F)

3-04. Access roads. Access t o the top of the dam is provided a t Lincoln Avenue, Rosemead Bouleva~d, Durfee Road and San Gabriel River Parkway, Service access to the outlet works i s provided by ramps a t both ends of the bridge from the top of the dam to the control room. Access t o the downstream toe of the dam is provided by ramps near the ends of the bridge from the top of the dam down t o the road a t the toe. A ramp from the top of t'ne dam down the upstream slope t o the intake slab permits access t o the Rio Hondo channel, D i r t roads along the downstream toe provide access to the top of the outlet works channel. Service access t o the spillway structure is provided from 14ission p t i l l road via a ramp u? the down- &ream slope t o the top of the dam near the service building. Two d i r t roads are also provided from Rosemead Boulevard along the up-strean and downstream toes of the dam to a ramp near the west end of the spillway, A ramp down the upstiream slope on each s$le of the spillway is provided fo r access t o f ac i l i t i e s of the water companies located along the San Gabriel Rimr upstream of the dam, (See drawings, f i l e Nos, a6/Lo9 and 462/16, exhLbit F)

3-05~ Fences, Safety guard f~nces , 4 t o 6 f ee t high, are on t0i3 of the c- w a l l s on each side of the outlet works channel and. the spillway channel. They consist of galvanized chain l ink fabric, top rails, braces and posts which are s e t i n formed holeso GaLvanized malleable iron caps cover a91 pipe posts. Guard rails are provided a t intersections of the top of the dam with Rosemead Boulevzurd and Lincoln Avenue, Vehicular access t o the top of the dam and to the ramps is restr icted t o authorized t ra f f ic by locked cables strung between s t ee l posts; double gates with hinges, latches and loclcing devices are provided where fences cross the crest 02 the dam, Outlet works and spillway s-bructures are surrounded by &foot high security fencing. (see drawings, f i l e Yos. l46/90, 462/40 and 464/125 t o 4641128 inclusive, exhibit F)

3-06, Dam tender's h m e , The dam tenders s house i s located on the west abutment of the e m b d e n t with access from Lincoln Avenue, The house consists of a livFrsg room, dining room, kitchen, two bed-r o w , bathroom, laundry room and closed-in porch, In addition, there is a two-car garage with attached storage room. (see drawings, f i l e Nos, l&b/l4S and l46$U46, exhibit F)

W Eleetrieal service, which consists of a single-phase, UO-220 mlt three wire current, is suppPied by the Edison CoIQmye

Natural gas is f d s h e d by the S~uthern Counties Gas Company of California fo r a gas range and water heater. Water fo r drinking and household use i s supplied by San Gabriel Valley 'dater Company direct from thei r nearby pumping stat ion by a l*-inch pipeline. Sanitary facilities incXude a sept%c tank with tLle t~eaaches.

Commercial telephone s e r e c e is furnished by the PacSfic Telephone Company, The house i s also equipped with a radio receiving se t f o r c o d c a t j b o n wi- th the DiskrLet OffLce, A standard flag pole, 25 fee t high, made of s tee l and s e t in concrete, is standing i n front of the hause, 3-07 e The dam tender or his assistants s i~ns and maintenance and shal l complete ~ h s p c % ~ o n check liit as sham i n exhibit C, HaLn.%mmce work fs descr5bed in de ta i l ffl the following paragraphs:

a, Embanrhents, Naintenanes methods fo r rep& op recons%ruction ents shall depend upon the eKtent of the damaged section, If the enibaient damage i s small, sand and gravel or other coarse granular ma.terM may be placed i n 6-inch layers and cor;rgact& t o a t l a s t 95% of standard W W O ( T ~ Y - S ~ ) mmdmm density t o m&om the e&daaents, If the damage i s large, the ffll shall be mac1.e in the same manner as the original comtrmetion; homogenous material from bomm pits approved fo r the project shall be placed in m 3 f o l . m EroriaonM layers not more %ban 6 inehes in depth and compacted t o a density equal t o the original embankment section.

Bamagd enab-ent slope p r o ~ s ~ t i o n and mder2.yLng f%lb%es materfal shal l be seslmed in dl. cases* p The wells in %he embalment shall be checked once a year fo r a c d t i s n of debris. The depth of the wells and also depth of the water surface shal l be measwed %Lnd the records of measure-ments shall be kept and svbmi.l;%ed t o the Fomdation & Materials Branch of the Distr ict Bfffce, b, D m tender' s Houses Thie d ~ a p a p h concerns the dam tender's house, the garage building and addacent improvements, landscaping, vehicles and ewpment, lM..ntenmse and repairs of the

I above items include the following: I

(1) E f e c t ~ i c a l . See t h a t e l ec t r i ca l c i r cu i t s are I protected by fuses or automatic c i r c u i t breakers of the correct capacity 1 -fo r the par t icular c i rcu i t . E lec t r ica l maintenance Slcluding b s t a l l a t i o n of new wiring s h a l l be i n s t r i c t conformity with the 1

National Elec t r ica l Code, 1 C

(2) P w . Painting, redecorat-h g and s M l a r types of work should be done during the dry season, I preferably during May and June,

(3) Vehicles and equipment, Vehicles and equip-ment, h c % u c h g tools, s h a l l be kept in f i r s t - c l a s s condition.

Gommmen~o&med niotor vehicles w i l l be inspected and maintained by I the base yard i n accordance with "Technical Manual 38-660-1, Operators I W n b e m c e InstrucLLons and Procedures f o r Aelmlnistrative Motor I

VeMclea - 16 4prU 1957 . I t I

(h) k n d s c a p b ~ . Landscaping maintenance work I includes i r r igat ing, pruning, P l r f i e g , and other work required t o keep %rees, shrubs, flowers and grass in f i r s t -c lass condition. I

I

Damaged concrete or ri-pap s t m c t m e s s Broken concrete surfaces and exposed reinforceinen% steel s - ~ 1 - be- thmoughly cleaned by chipping or sandblasting and s W be b u i l b u p t o the or iginal dhensions;

pneumatically placed Portland cement mortar is sat isfactory f o r this works S d cracks i n the concrete m y be f i l l e d with asphalt. Any ipl&cation of settlement, upW%, or f&we of concrepe s t ructwes, shall be reported by the Chief, Constzuction Division, t o t h e Chief, Emg$neming Divtsj-on, f o r andys%s aabd For recornendation on remedial action.

d, Access roads and b e m . Access roads and embadanent $ems shall be adequately nzdntahed f o r vehicular t ravel so that I ssrdimry mahtenence 02 the pro3 e c t and f lood-f ighting operations will be fac i l i ta ted , I

I s, Fences. .Maintenance of the safety guard fences shall include keeping (a) l i n e posts f i rnly s e t and gates l~une; i n ood alinanent; (b) barbed wkre t i g h t and broken strands repatredg c ) corner posts, gate posts, and braces f imdy se t ; (d) posts, I braces, and gates t h a t reqyire paint, properly brushed painted; I

(8) chains and locks attached t o 091 gates; and ( f ) gate keys available a t the dam tenderts house t o permit authorized t r ave l I tku'ou.ghout the property. I f a Burrawing animals. Monthly patrols of all embankments and channels shdl be made f o r evidence of burrowine: activity.

Burrowjng animals i n or near the dam and channels shall be ekberminated, Their runways and dens shall be opened up and thoroughly compacted a t the same time they are backfilled. Trapping and poisoning may be used for the extermhation of burrowing animals. Information about other methods of animal extermination may be obtained from the county agricultural agent.

\ g. ~ o u s obstructions. Reservation azea used by w authorized personnel shall be kept f ree from obstructfons that ~ ; U P cause injury o r impede inspections, maintenance, or flood-fighting operations. Materials, equfpment ; and auxiliary construction shall be stored i n such a way that they axe not hamrdoua t o persomel.

SECTION 4

OUTLET NORKS

h-01, .Dwcri t ion, The ou t l e t works eoilsist of (1) a rectangular upstream sec r-- on with gravity-type quadrant w a l l s and a reinforced slab, (2) a cent ra l unit, a 0 f e e t long and lh.4 t o lhti f e e t wide between counterf orted abutment w a l l s , containing the f aur 30 f e e t wide by 20 f e e t high t a i n t e r gates, and (3) a downstream r e c t a n ~ l a r section of cantilever w a l l and s lab constr~7-ction with a counterforted t rans i t ion t o the trapezofdal cross section of the Rio Hondo channel.

(see drawings, f i l e Nos. &6/40 and l46/52, -bit F) h-02, Approach channel. The w a l l s of the upstream channel ase quadrant w a l b extending up 24 f e e t from the invert slab, the l e v e l of f r e e flow dischaxge through the out le t works of the design outflmr of 40,000 c .f, s, The radius of curvature of the quadrants is 35 f ee t , The slab between wall ls , 2 f e e t i n thiclmess, is provided with weep-holes and a subdrainage syatem of drain material fo r r e l i e f of u p l i f t pressures during rapid drawdown, (see drawing, f i l e No, l46/59, Ekhibit F) h-03. Outlet structure. The out le t works gate s t ructure wfth a length of no f e e t and a maximwn o v e r U width c f 2& f e e t contains bays f o r the four t a h t e r gates. The gate openings a r e formed by a breast w a l l or stop w a l l t o permit use of the re la t ive ly small gate opening height of 19 f e e t hn s p i t e of the t o t a l operating head of 50 feet. Prbcipal f ea twes of the s t ructure a re the supporting slab, aSutments, in te r ior w a l l s o r piers, the stop w a l l , and a bridee which provides a roadway and houses the control rooms and machinery f o r the gate operation. (see drawings, f i l e Nos. l46/b2 and l46/66, EwhLbit F) I

4-Ok. Control room and generator room, The control and generator rooms include, i n effect , prolongations of the bridge s t ructure behind the abutments and a r e carried by diaphragm w a l l s from the underlying abutment counterforts. The control room, form-ing the west end of the ate structure, contains gate position indicators, radio transmitter and receiver, water stage recorder,

- heating uni t and t o i l e t f a c i l i t i e s ; the generator rcom, located a t

3 the eas t end of the structure, contains one 30 KW-120V, two 75 KW-LUOV generator units, one 1s KVB-2400/120V and three 25 KVA-2400/k60V transf omers and power, l ight ing and generator control panels. Ei%her of the two '75 KW generators ( ~ x h i b i t (2-2, plate No. 8) supplbes current f o r the operation of a l l gates, l ights , f loodlights, radio, selsyn motors, and receptacles a t the out le t works and spillway. The 30 iCW generator (Exhibit G-2, p h t e No, 9) supplies current f o r the same ins ta l la t ions as a

75 KW generator except f o r the operation of the gates. In the gate hoist chamber is a 1200-watt automatic generator f o r the radio and selsyn motors operating the eas t pool water stage recorder and automatic gate No. 1 alarm switch. T h i s generator autoruatically starts with f a i l w e and stops with resumption of service from e i ther of the d iese l engine generators or Edison power. A 5-gallon capacity gasoline tank provides f u e l f o r a r u n of 14 hours maximum.

(see drawinss, f i l e Nos, U6/49, 46/79 and l.&6/87, exhibit F, and pla tes Nos, 4, 7, 8, 9, 10 and 19 Exhibit G-2)

4-05. Downstream channel, Downstream from the gate structure, I I a reinforced concrete channel is provided which includes t ransi t ions from the 4s-ft, high rectangular section t o the 15-ft. high trapezoidal

I section of the Rio Hondo channel iniprovement. The channel base I width converges in this length from l& f e e t a t the gate s t ructure t o 100 f e e t a t s ta t ion 15+0O, (See drawing, f i l e No, 46/60, I

Ekhibit F) I

4-06. Subdraina e Drainage re l ie f in the downstream channel b--g' is provided y a grid of &inch perforated v i t r i f i e d clay collector pipes both 1 0 n g i t u d i r . y and l a t e r a l l y under the downstream slab, and by pipe collectors in 2-layer f i l t e r pockets behind the down-stream w a l l s . The w a l l drainage system is interconnected throughout and discharges through the channel w a l l s by means of manholes located on both sf des of the channel a t s tat ions 10E-37, 12+45 andl a+95. Zach nlanhole has an outilet discharging fnto the charael and is also provided with two f l a p gates which prevent water from back-ing up in to the anderground drains and depositing silt in to the collector pipes. Between the end of the gate structure a t s ta t ion 10E-31 a ~ d stat ion 12+50, where high underseepage is anticipated, a 92-inch thick drain blanket has been provided under the concrete slab; the remainder of the slab has a similar 6-inch drain blanket, Each year before the rainy season the dtam tender or h i s assis-i;ants shall inspect the. subdrainage system t o detemine if drains are functioning properly, Inspection w i l l cor~s is t of checking operation of f l a p gates and manhole covers, ranoval of debris in the bottom of manholes and surface drains and flushing the collector l ines. A pump and hose is required t o punp water through the drainage system, (see drawings, f i l e Nos. l.46/60, 46/63 and lL6/124, exhibit F)

%-07, Diversion conduit, Provision has been made in the project t o maintain water rights of the r i s ing groundwater flow i n Rio Hondo by means of a diversion conduit through the l e f t abutment. T h i s conduit, 3 f e e t in diam2ter, i s controlled by an 36-inch manually operated s l ide gate, located in a well i n the abutnent and discharges n o d stream flows in to an unhproved di tch behind the l e f t wall of the downstream e a e 1 . A grouted rock dike, top elevation 188.6, has been erected extending frora pier No. 1 upstream t o high ground, and with gate No. 2. closed, low flows w i l l be directed into the diversion conduit. The operation of gate No. 1 is controlled by a f l oa t switch which w i l l . automatically open the gate when the pool reaches water surface elevation 189 and will close the gate when the water surfme recedes t o elevation 187. (see par, 6-03 and 8-02)

It is the duty of the Eos Angeles County Flood Control Distr ict t o close the 36inch ga'te a t times when the discharge through the outlet works exceeds 3,000 c.f.s. b e drawing, f i l e No. 346168, &bit 3 ) ction and maintenance. The dam tender or his assistants s inspect each year, before the flood season starts, the interior of the outlet worb i d shall complete inspection check list as shown 3n e a b i t C, Ia addition t o inspection and maintenance work previously described for embankments, concrete and riprap struotures, and s d e t y p a r d fences, the dam tender shall perfom maintenance work pertaining mostly t o…