LADM NO. 1130-2-21 Hansen Dam FCB O&M Manual 04-1963.pdf

LADM NO. 1130-2-21

i LOS ANGELES COUNTY DRAINAGE AREA, CALI FORNIA

OPERATION AND MAINTENANCE MANUAL

FOR

I I

1 HANSEN DAM AND FLOOD CONTROL BASIN

TUJUNGA WASH IMPROVEMENT

U. S. ARMY ENGINEER DISTRICT, LOS ANGELES

CORPS OF ENGINEERS

APRIL 1963

W. A. ARMY ENGINEER DISTRICT,

LX)S A N C . . W , MARCH 1963

F O R E W O R D

1, T h i s m&nual prescribes standard procedures for the operation and maintenance of the f ed0raI.Q constructed Hansen Dam and Flood Control Basin, Tujunga Wash Improvement, California. 1111 previously issued operation and maintenance manuals are superseded by this manual.

2, The Dams Section, Design Branch, Engineering Division is responsible f o r t h e p r e p a t i o n of this manual and fo r keeping this manual up-to-date. Suggested reds ions should be forwarded, t'mough channels, to that section.

&jm, Corps of Engineers Assistant DTstrict Engineer

TABLE OF CO19TEECS

SECTION 1 . INTRODUCT1ON

Authorbation .~e.~aecae.oe~sce.ee.ooecoseeeceo~e8e.~ O ~ O B Q

Locat5on. ...........~~...0.8.~..~.~0~.........@..4.0.~..~ ................................... Description of proJect Protection p~ovided ...a....................~ Basic design r e w s . ...0.........e.................~..8.

CoIwtruction hislxrg .................a...........a !Cujunga Wash Channel S w of hydraulic design data .......................e.

Recreational development ....................e...e...~

SECTION 2 . G m PROCEDURES

Appro-d x e a t i o m ...o...........................~ m o s e of d.. ...................................... . De).TMtiow . . . e . w . . e * . . * . e o ~ * . . . . e * e . . . e . . b e e b e b e e . .

Reference . dxawings and -W ...........e..........e.... .................. Functions of the Construction Dideia. .................. Funations of the Ehgbeering Di.cTision..

Joint functions of Construction & Engineering Dive . e r e o ......................... D ~ t f e ~ of the Dam Tende~......~.

Fun~tiOEL8 of U . So bolo@ Ca3. S u ~ v ~ e a e o .* e.eeeaoeeeeeeao .......................... 'k.&lhg of b y prsonnel..*..r

0. *........e......... Prevention of encroachment tmspass ................ .. Pemdts for entry use of rights.of.vay ...................... Routine inspections and m a i n w o e .................................. Routine test operations ............... Reprts . . . . ~ e . e ~ a . . o . a e O e e o O e e e e ~ ~ . e o . . ~ e

SECTION 3 . RESERVOIR aREA AND ~~~S

.... Dam . . ~ . ~ ~ e ~ . . . . . . e ~ . . o . c . . O . ~ e e . e O . e ~ b . e a o e ~ . ~ b ~ e b b

Access road8 ..........................................e..

Faces... ................................................ .................. M s i o n s against seepage and uplift..

In8pectiw and &tem~e.er.. ........................a a . 3.Qtib-t maintenance ..r.eeee..OeeeoQee.eea b a Concrete and +prap..... ..........O........~..O c . Seepage ~ o . o . r ~ ~ o ~ ~ 0 6 ~ ~ d ~ ~ m e o e ~ e ~ o o ~ ~ ~ e ~ Q e e * a * e a e e e a o a ............................. . d Access roads and be-..

eq Fences ..........................................~ f r B U I T O W ~ ~ ~ ~ a o e ~ 0 8 o ~ e ~ . a o ~ e e . e ~ ~ e ~ ~ o e e e ~ e . e ~ ~ ~ ~ ~

g. Hazaxdo~ o b s t r u ~ t i ~ ~ ~ . . ~ ~ ~ O Q O c o .. e.0~erede.BQ4.~.~

TABLE OF CONTEXTS . Continued

Paragraph

SECTION 4 . OUTlXT S T R a C m

DescriE)tlon ~ o s ~ ~ ~ ~ ~ a ~ ~ a d ~ ~ ~ ~ a ~ o ~ ~ ~ e ~ o e ~ e a ~ e o e a e ~ ~ a o a e a e a

Intake ~t~~t~e..~~~~~~....~.. .......~..........a....~.

w a s Operating howe ........a.....a................~........~ V a t h0~88a.a .~~~~~a~.....~.aa~~~.......ae....o......e.a Outlet works ..................a...........e.........~.~~ Outlet chann8lo.a ..a..aer.a..a.ea..ae.oeer.eaoo..eae e o o a

Impec%ions and &tenance...... .........a....a...a a . C h a n n ~ I s . r a o a ~ a a ~ ~ . ~ a e ~ ~ ~ ~ ~ ~ a o ~ ~ ~ ~ ~ ~ ~ ~ ~ e ~ a ~ ~ ~ ~ ~ ~ a ~ * ~ b . Weep h ~ l e ~ . ~ . ~ . ~ ~ ~ ~

SECTION 5 . SPIUWAP

Spillway stmctwe aa.*...a Approach chawlelaoa ..a..a......a.....a Access t m l a ........................................a.

Spillway &W ......a S1Bb8.e ..ra..a a . a a a ~ ~ ~ ~ ~ ~ ~ ~ ~ o a ~ ~ a ~ ~ a ~ a ~ ~ ~ ~ ~ ~ ~ e ~ ~ ~ e ~ ~ a ~ * ~ o

a. Intake ....a..................~..~~..~.~~.

be Spillway apron slab (upstream) o....a

Spillway sW.... 0. ..a..a...........*................. ................................. do Outlet ahamel sl& SpiUX8~y bridge .................a...~..a~a....a.a..aa~aa Inspection and m~~intenance..~. ...............a........~~

SECTION 6 . SERVICE GATES AID HOISTS

SECTIOIJ 7 - =CTRLCAT-I FACILITIES

Eleotrica.3. ~pp~aor.r.aoaaaea...seaeeeooeaaaoaoraa~*.ae Standby p e r unit SWit~fkb~daaa ..aaar.e.r.a..aa.a.o.a.eaaa.e.a.eeae. e e r o e

Light fMwesoaa.. r.e..eaa.aie.ree. s.eoe.ce.aeaeo O O O ~ O ~

Convenience ~ ~ ~ ~ ~ . O ~ , . ~ ~ ~ ~ ~ O ~ O O ~ ~ O O ~ ~ O O B O O O O ~ O ~ ~ ~ ~ O ~ O ~

TA9LE OF CQNTEEUTS . Continued

SECTION 7 . EI. ECTIaCAL F.SCILITIES . Cont'd

...................... Insl~ections. t e s t s ant! maintenance

a. &nerd b . Electr ical supp2y ................................... ....................... . . c Standby power uni t engine..

d. Stsitchboard !& l igh t inp f ixtures

e. Transferring power plant.. ......a.a

SECT1 ON 8 . HYD iZf)GIi4 nlI fi:STALJA 'PI ONS

Slope ?age ..................a.aa Vertical s ta f f .-gees ............a.a Water stage recorder. .............aa.......a.a.a........ ............................ Remote' reading ins ta l la t ions ................................ Gate position r ecoder s ................................ . Gate posi.tion indicators .................................. a . Selsyn indicators.

b . Gate stem indicators.. .............................a Standard ra in gage... ...ma.............................. ................................. Automatic rain gages... .................................. Outflow gaging s t a t ion ................................. Sedimentation monuments ........ Inspection. servicing. maintenance and reportin,a ........................ . a The duties of the Dan Tender . . be The U S Geological Survey......................... ........................... c. The Engineering Division.

SECTION 9 . C O M i W C A T I C K FACTLITIS

Padio station.... .....w..............................*.. .............................................. Telephones blaintemnce ..a.a

SECTION 10 . DAM Tt4M)ER'S IlOUSE

DescTiption .........a..aa Inspections and maintenance.. .......................a.a.

a. E l e c t r i c d ...................a.a b . Painting and re?econting.. ........a.aa....a.aaa.a.. .............................. . c Vehicles ahd equipment d . Landscaping .......a.a

e. Foundation f . N i ~ ~ e l l a n e ~ ~ s ...a.a iii

TABLE OF CONTENTS--Continued

Page

SECTION 11 - hrBTX!l: SUPPLY Ahm SXWAGE

Water-supply sy~tem.........,...........~.............~~~- 11-1 Sewage sy~tem.,........................................~ 11-1 Inspections and maintenan~e............~...............~ 11-1

SECTIUN 12 - F'IBE-FIWTING EQUIPMENT AND FTN PREVENTION .

Darn tender's hou~e............,......~.................. 12-1 Garage and wash house.,,...........,.................... 12-1 Storage shed metal building.. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1 Tool and paint ~hed....,...............................~ 12-1 Control house,.,....................^................... 12-1 Inspections, t e s t s , and maintenance....,................ 12-1

a. Fire extinguishers,, . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . 12-1

b. Fire hoses and bibbs. , , . , . . . . . . . . . . . . . . . . . . . . . . . . . 12-1 C. Fire prevention.,.................. ............... 12-1

SECTION 1 3 - ~ S E I ~ O I ~ I!l3GULATIONS AND

FLOOD EKE RGENCY RJ3QUI RE;MENTS

:Reservoir regulation .., nood emergency preparations Inspections.......~....~ flood warnings ., ~lobilizati~.............................~~ Notification of reservoir releases........,.., EXKIB ITS

A General Plan B Instructions fo r Operating Diesel Stmdby Unit 2 plates C Inspection Check Lists D Test-Operation Reports E ate Operation 2 plates F Drmings - "As Constructed" and Index (unattached) G Reference Manuals (unnttached)

No. 1 - Instructions f o r Operation of Service Gates Wo. 2 - Instruction E!anual, Diesel Engine

H Safety Pquirexnents, Department of Army, Corps of Endneers (unattached)

EXHIBITS

TITLE

A Project location (unattached)

B P h and elevation ( u I P & % ~ o ~ & )

C Inspection check lists and maintenance lists

No. 1 No. 2 No. 3 No. 4 No. 5 No, 6 No. 7 No. 8

Project area Dam and spillway Approach and intake structwes Outlet s t iuctwes and gates Hoists, standby un i t and cornmication I-Qrdrograjhic installations Buildings and equipment Ut i l i t i e s and miscellmeous

D Test operation reports

E Genera l safety requirements, Mands, Corps of qdgineers, U. S. Army, EN 385-1-1, 13 Bkch 1958 (unattached)

F Drawings ("as constructed") (unattached)

G Reference manuals (unattached)

No. 1 1956 Safety Program No, 2 Instructions for operation of s e rdce gates No. 3 Instructton manual, main engine, 4-cybder No. 4 Instruction manual, star-ting engine, 2-cylinde~

OPERATION AX0 ~ ~ T E N A N C E 3I[AIWAL

FOR

HANSEN FLOOD-CONTROL BASIN

LOS MGELES, C a m m u

SECTION 1

1-01, Authorbation. Hanaen flood-control basin, which was constructed under authorhation of the Flood Control Act of 22 June 1936 (as amended), was incorporated in to the comprehensive plan of improvement for the control of floods in the Los b g e l e s drainage area by the Flood Control Act of 18 August 19u.

1-02. Location, The Hausen Flood-Control Basin is located on the northern edge of the San Fernando Valley on Tujunga Wash just below the confluence of Big and Li t t l e Tujunga Creeks. Tujunga Wash follows i n a w r a l southerly direction as a poorly defined natural channel across San Fernando Valley t o the Los Angeles River. The Hansen dam s i t e is locrated about one mile below the junction of Big end Little Tujunga Creeks, and &ou% four miles west of the town of Sunland. The boundary of catcherit area is formed by the San Gabrielllountains on the north and west, and b y t h e Verdugo Mountains and a secondmy range of the San Gabriel H o u n t a i m on the south and east, The location of the project 3.s shown on exhibit A, 1-03. Description of project.

a, Description of drahae:e ares. The &ahage system a b m the dam s i t e has an area of l47.b square miles, consisting of

- nearly all relatively steep mountainous terrain and comparatively WAle flat valley f loor , The natural water~hed is about miles long, irregular in shape, and is varying from 5* t o 9 miles in width, Elevations vary from about 6,000 f ee t a t the upper east edge of the e watershed, and 2,000 fee t at the west edge, t o 980 feet a t the dam s i t e , The highest point in the drainage system is Gleason Peak having an elevation of 6,503 feet.

b, Principal structures and damr (2) - -out1e-b stmcture consisting of an approach channel, and-intala structure with tower and control house, eight gated outlets with gates and hoistihg equipment, two ungated outlets, a standby power unit, a service bridge, connecting the control house and vent house, and an outlet channel; (3) an ogee spillway; and (b) a dam tender's house, o or drawin s f i l e nwmbers of Hamen Dam9 see index t o drawings, exhibit F 7 c, Hydrowaphic installationse Hydrographic installa-t i o m include: (1) a slope gage; (2) a series of ver"ccal staff

(3) a water-stage recorder; (4) a gage height indicator;

g ~ L i g h f i gate position recorders; (6 ) three gate position indicators; (7) a standard glass tnbe rain gage; (8) an automatic rain gage; (9) an outflow gagfng station; and (10) a number of sediment monumentse o or description of hydrographic installations, see Sec-bion 8)

d. Coxuraunication fac i l i t i e s , Communioation f ac i l f t i es include a radio transmittine: and receiving station. tele~hones a t the' control house and the dasn t;ndert s house ~ e r r l c e d ib the' pacific Telephone & Telegraph Company, and phones between the operating house and the gate chanibers which are battery operated, (FOP description, see Section 9)

1-04. Protection provided. The Hansen Flood-Contsol Basin is a.11 essential unit in the IT. So hgineer Department General Plan fo r flood control in, the Los hge l e s River dra&aee basin, In conjunc-t ion with Sepulveda and Lopes, the basin is essential for flood protection of lower portions of San Fe-do Valley, the c i ty of Los Angeles, and all of the c i t i e s and intervening terr i tory located near the Los Angeles River between the c i ty of Los Angeles and the Pacif i o Ocean a t Long Beach. Storage regulation given by the flood control basins p d t e efficient operations of the Los Angeles River channel, LSe Basic design r0-t~~ A pre- hyd~ology report was made in Decdber 1936 entitled *Hydrology of the Los Angeles and Rio Hondo Rive~s* being revised in 1939 t o include the influenae and data sf the &ch 1938 flood, llAnalysis of Design of Tujunga %sh Improv81llen-t - Hansen Damn - volume I and 11, dated 2 May 1938 was superseded by volume III, dated 1 June 1940, An ~ A r d y s i s of Design of 5 feet by 8 fee t Service Gates fo r Hamen Dam" was issued January 1939, and an nanalysis of Hydraulic Design for Haasen Flood Control Basinn w a s issued 18 Pbch 1940~

1-06, Copies of the contraots fo r h ~ s e n Dam ce of the District Enginee~, Los hge l e s Distric%, Cows of Ehgineers, Pertinent data on the principal contracts are as follows:

a, Dam andl appurtenant work.

Contractor: Guy Fo Atkinson Company Contract No, W-509-hg-689 Work started: 20 September 1938 Work completed and accepted: 5 September 1940

Contractor: Consolidated Steel Corp., layw wood, California Work started: March 1939 Work completed and accepted: 19hO

1-07. 'hjunga Wash channel. The Beachy Avenue t o Hansen Dam unit, being a par* of the Tujunga Wash chamel improvement, conveys the controlled discharge fromthe Hansen Dam Flood-Control reservoir for ultimate discharge in to the Pacific Ooean via the Los Angeles river, For spreading grounds below the dam, this unit provides special outlet structures, which are operated by the Los Angeles County Flood Control Distr ict ami the c i ty of Los Angeles, Department of Water and Power. The Los h g e l e s County Flood Control Distr ict maintains a special telephone lfne from the spreading pounds to the operating house and upon approval by the Distr ict Office, the dam tender w i l l ra i se o r l w e r the gates t o regulate the flow of w a t e r to the spreading grounds, 1-08, Summasy of hydraulic design data, Flood control basin Area a t spillway cres t Capacity a t spillway cres t Area a t max, wabr surface

(el.. 1082) Capacity at max, water &ace acres acre f ee t acres acre f eet

Regulation - (~eservoir Design Flood) Inflow of storm - 4 days acre f ee t JMlw peak c.f .s.

Outflow peak c.f .sc

0 Reduction in peak c.f

Top elevation fee t m,s,l..

Height above streambed . fee t Length at crest f ee t

(continued next page) earth 1, a7

10,475

Sumnwy of hydraulic design data contl d

%me cubic yards 13,990,000

Net lengbh Crest elevation lkx. water surface elevation Discharge ( m a . water surface)

Outlets Gates - rmmber Gates - size Openings, ungated - number Openings, size Conduits, number and size Conduits, number an8 size Conduits, length Gate si l l elevation Gate sill t o max. water surface fee t fee t m.s,l.

feet m.s.1.

cef 03.

fee t 5x8 fee t 8x6 eight - S1x81 two - 81x61 f ee t fee t rn.s,l, fee t 91*8

1-09, Reoreational developmentc, Under the terms of a 40-year recreational licence granted 15 November 1947. about 1,427 acres are gradually being developed and maintained for public recreational ac t iv i t ies by the c i ty of Los Bngeles, Department of Parks and Recreation.

SECTION 2

GENERAL PROCEDURES

2.01. Approved regulations, Engineexdng N a n d for C i v i l workse Flood Emergency h u a l , Los h g e l e s District, F'ire Fighterst Training lbual, General. Safety Requirements, Corps of Engineers, U. S. Arrrgr, 385-1-1, 13 I b c k 1958,

- 14otor Vehicle Inspeetion - Prevention 3iaintenance Services

TM-37-2810, W. D, Technical Mantzal, Fire Prevention Code, N.B.F.U.

N a t i o d Electrical Code, N.F,P.A, Reservo* Regulation EillarmaJ, fo r Hansen Dam.

2-02. Purpose of I I U U I ~ . The purlpose of this manul is t o 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 &sen Dam and flood control basin, These instructions =will insure the contfrmous msintenance of structures and equipment and their operation i n such a manner and at such times as w i l l obtain optimum benefits.

2-03, D e f i n i t i w Specialized terms used in this d are defined as f e

"Engbeerjtng Division1! and nConstruction Divisionn refer t o organi~ations w i t & the Los Angeles District, Corps of Engineers, U. S. Arqy Engfneer District, "Flood Seasonm refers t o %he period from. 15 Bmermber t o 15 April, when most past flood have occurred.

tlPeriods of Controlled Operationn refer t o periods i n which the.reservo5.r water surface r i ses above elevation 990.

'Qajor High Water Periodn refers t o a period i n which the reservoir water surface rises above the invert of the ungated out-l e t s a t elevation 1013.

"Emergency Flood Conditionw refers t o periods during.vbich the reservotr water surface r i ses above the crest of the spillway at elevation 1060.

AU. elevations refer t o mean sea level datum, N,S,L.

2-04, Reference drawirmgs and manuals. References 5x1 this manual t o &awing sheet numbers refer t o nas-constructedfi drwbgs, which are included i n exhibit F, They are half-size and separately bound, Qhhibit F also includes an index of a l l ftas-constructedtf drawings.

Drawings of manufacturers1 equipment and other special drawings, mual.s, and instructions referred t o i n this m u a l are l i s t ed in exhibit G and are on f i l e i n the d i s t r i c t office and at Hansen Dm, 2-05. Functions of the Constsuction Didsion, AU. project it.lspection,operation,and maintenance functions are under the juris-diction of the Construction Division, with the exception of those fo r hydrographic installations, which are described i n Section 8, The Construction Division receives and f i l e s a l l routire inspection and operation reports, keeps a complete operation log and participates in engineering inspections, (see paragraph 2-07 )

2-06, Functions of the Engineering Division. The Engineering Division Prepares and executes a l l flood fighting plans f o r the project &d %hrollgh i t s hydrology and reservoir re-&ation section directs the dam tender or assigned alternates i n the operation of the gates, %en major repair of any project structure is necessary the Engineering Division makes reco~rmendation fo r repair at the request of the chief of the ConstructLon Division. The Engineering Division keeps records of reservoir stages, inflow t o the reservoir, releases through the outlet structures and spillway overflaw. The Engineering Division also keeps on f i l e one copy of all semlmonthly t e s t reports on standby generator units and monthly reports on gate tests. The Engineering Division is responsible fo r the inspection, servicing and maintenance of a l l hydrographic installations, Their routine inspection w i l l be done by the dam tender, (see section 8, and exlLbiPI C, Inspection List)

2-07, Jointi Functions of Construction & Engineering Divisions.

limetliately af ter each mJor high water period and each severe earth-quake, a qualified engineer fxornthe Engineering Division and one from the Construction Didsion shall inspect the project and shall report their findings i n a joint report t o the chiefs of the Engineering and Construction Divisions, 2-08. Duties of the dam Lender, The dam tender, residing a t &sen Dam, performs the functions listed below:

Routine t e s t operations; operates a l l ges and reco>bers (winds the clocks, installs new record paper, e t c . r operates the gates in accordance with instrucJGions from the hydrology and reservoir regulations section and i n an emergency as outlined in Reservoir Operation Sknual; guards the pro j eat against vandalism, sabotage and fires; guards against unsafe copzditions i n the project area;

performs routine inspection and maintenance; reports on trespassing and encroachment of right-of-taay; maintains the best possible rs-la t iom With communities interested ir, the project, 2-09. y agreement between the S m e y , the l a t t e r w i l l s e r k c e the-outflow gaging station, make discharge-measure-ments and compile and publish the outflow records i n the U,S, Geological Water Supply Papers, 2-10, Tra.ining of key personnel, The Engineering Division of the d i s t r i c t office shall t ra in key personnel in the operation of service gates, hoists, standby pow~r"units, c o m m ~ c a t ~ o n faci l i t ies , operation and maintenance of hydrographic h d a l k t i o n s and flood-fighting; personnel also shalL become feun2liar with this manual, the Flood-Emergency Manual, the Reservoir Operation 1-hual and with the "as constructedn drawings, 2-ll. Prevention of enmoaehment or trespass. Bny encroachment or trespass on the rights-of-way. t h a t hinders the efficient operation and &tenance of th; project,- shal l not be allowed; The d& tender shall post "No Trespassing" signs a t conspicuous places on the prodect and shall report any unresolved disputes t o the Chief, I~iaintenance Section, who in turn w i l l refer them t o the Real Estate Division.

2-12. P d t s f o r entry or use of rights-of-way. ~ e k e s t s fo r permits Por temporazy right-of-entry or fo r uae of govemnenb own& rights-of -way- shall be~ca~eft.111~ considered t o determine that such use w i l l neither decrease the safety of the project nor hinder its proper functioning a t any -L;ime, These requests shal l be referred t o the Ehgineering Division through the Real Estate Division for appropriate action.

2-13. Bouthe inspections and main$enance.

a. Periodic routine inspections. Periodic routine ins~ec t ions of s b c t u r e s and equipment and of the reservoir area shall be bde by the dan~ tender or his a&istants t o deternine maintenance measures that ape reqtzired, These inspections shall be made immediately before 15 October, when the flood season begins and a t intervals of not more than 90 days? Mope frequent inspections shall

- be made if r e q u k d for the safety and efficient minte-ce of some features of the projecto During each inspectfon a l l items requiring maintenance shall be checked and described on the inspection check lists included as exhibit C, After each inspection one s e t of the inspect ion lists shall be pronlptly submitLod t o the Chief, F U -a tenance Section, who w i l l route it to dis t r i c t enployees coac~rned with maintenance; one s e t s h a l l be submitted t o %he Chief, Operation Branch asd one s e t shall be retained by the inspector. If maintenance requires hiring additional labor or equipment, the d m tender shall submit t o the Chief, Operation Branch, a list of proposed maintenance measures. T h i s list may be. omitted when dangerous conditions requb% immediate attention, N o d maintenance shall, be made without deEay during the nonflood season. All repairs shall conf om t o stan&d engineerhg practice and t o the details shown on the Itas constructed" dra~qings, exhibit Fa be 1n' general.

routine iilspect c gages shall be performed by the dam tender or his assistants i n accorclance with instmctions from the lwdrology and reservoir regulation section of the dis t r ic t , T h i s work i s described in deta i l i n parasaph 8-09, c, EnffSneering inspection, After high water and severe earthquakes, see paragraph 2-07, d, Safety branch fnspectiolno A l l first-aLd act iv i t ies i n connection wi%h flood enernencies are d e r the su~ervision of the C h i e f , Safety Branch. A t the-beginnbg of each flood-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 daTn tender and his assistants are adequately instructed in first-aid procedures.

Ap~ropriate equipment includes standard fh s t - a id kits and such items a s blankets, stretchers, safety belts, l i f e lines, kapok ves ts, ring buoys and boat hooks. Grappling irons are provided from the base yard and gas masks =e provided by the Los Angeles Distr ict office, (see Flood Wrgency Manual, paragraph 6,06)

2 Routine t e s t operations. The dam tender or his assistants shall test-operate the service gates and electr ical f ac i l i t i e s in the control house every 30 d&s and the st=dby power unit every 15 days. Test operation reports (see exhibit D) shall. be completed i n quadrupUcate af ter each test. One copy sha l l be promptly submitted t o the Chief, Maintenance Section, one copy t o the Chief, Engineering Division, one copy t o the Chief, Construction Division, and one copy shall be retained by the dam tender. During reservoir regulation by the Engineering Division the diull tender or personnel assigned from the Engineering Division (see section 13) shal l raise and laser each gate in accordance with radio or telephone insLructions from the &drology and Reservoir Regulation Section, or, if comlunicat.lons fail, in accordance with the gate-operation schedule in exhibit E-No, 6 , 2-15;, Re~mts . PT~scellaneous reports are described in deta i l in p a r a g r a P h s ~ ! 2 - l l , 2-12, 2-13, 2-11, and 8-09, and also in paragaphs t i t l ed nInspections and naintenanceen

SECTION 3 i

3-01. Flood control basin, The flood control basin (or reservoir) was created by the coiastruction of ail ear t ISi l l dam across fijunga Nash a t a s i t e about 9,h miles upstream from i ts junction with the Eos Angeles River and 1s miles north 02 Los hgs les , The cwgacity of the reservo5.r a t spillway crest is 33,500 acre-fee%, e 3-02. Dams. The dam is a compac-bed impervious earth-fi l l structure. approximately 10,475 fee t long a t the creqt (elevation 1,087.0). The maxlrmun helght above streambed is 97 feet. It extends i n a general east and west direction a t r ight ang&s t o Wunga Wash, The a s of the dam follows a gentle curve in order t o connect the abuhents of the d m with a prominent rock Pnssa located near the canter of the dam s i t e , A t %he east end %he dam abuts against the hills, while on the west end the dam terminates oil a gently sloping h i l l .

Rock is exposed on the hi l ls ide at the east abutment and is found a t shallow depths en the west abutment, Between the ends of the darh and the central rock mesa the axis of the dam crosses tlie lower end of a ty r ica l debris cone. The upstream face of the dam has a slope of 1 on 3 and is covered with a 2 f ee t 6 inches layer of riprap over a 6-inoh spall blanket. The downstream face has a slope of 1 on 6 from the rock toe t o elevation 19020,0, a slope of 1 on 5 from elevation 1,020.0 t o 1,050.0 and a slope of 1 on 3 Lo the h crest. Three berma, each 20 f ee t wide, are running paral lel t o the axis of the dam, one on the upstrean face at exevation 1,040.0 and two on the dmstream face a t elevations 1,020 and 1,050, (see drawings f i l e no, 42S/l, 42L/68, 424/78 a d 424/79, exhibit F)

3-03. Access roads, Access roads t o the dam crest include Osborne Place and Osborne Street a t the west end, comecting with Glenoaks Boulevard and NcBroom Amue a t the east end. (see drawings, f i l e no. 425/1, 422/39 and 422/U, earhibit F)

3-04. Fences. Safety guard fences inclose the project all around and are provided with loclced gates at many strategic and convenient places. Pmt of the spillway bridge as wel l as both sides of the spillway on the downstream embankment are protected by 2-inch diamond mesh chain l ink fences, 6 f ee t high, topped with three stritplds of barbed wire, On the retaining walls the fences are a 3 fee t high, topped with 2 strands of babed wire. Posts and braces are pf l&inch stmdard galvanized s tee l pipe. (see drawing, f i l e no.

4&/66 and 424/71, exhibit F)

There i s a cutoff e of the dam. This cutofff&ll. also continues do&strem o n the outsize edges of the end monoliths. Low pressure grout holes a t 5-Toot centers a r e d r i l l ed ai~~~ro~uimately 25 f e e t deep on the upstrerun and outside edges of this cutoff. A drainage and grouting gallery is corrstructed near the rock l i n e i n tilo dam and high pressure grou-b holes a t 10-foot centers are d r i l l ed t o a-r;?roxiroately SO-foot depth below base of the d a l from the gallery on the downstrean and inside edges of the c7.1toff wall, ??L the ends of the spillway dam art iculated cutofr" walls 2rojecting lazgitudinally from the inside face of the s_willway channel walls er;teizd t o the concrete cutof2 of the ear th enbankr:lent t o trEc'n they a re joined. (see drawings, f i l e nos. 424/6/6H a d 424/74, exhibit F

3.06, Inspections and maintenance, The da13 tender or h i s assis tants shall perform periodic inspections and raintemnce and s h a l l conplete inspection check l is t Ijo. 1, as shown i n e:chri.bit C. >&in-ten&ce worl: i s described i n d e t a i l & the following paragraghs:

a. Xnbanlunent raintenance. I.:aintenance mell~ods f o r regair or reconstruction of the enbanl.men't;s s;?all depend upon the exbent of the cbmgei: section. If the embankment damage is small, s a d and gravel or other coarse franular material may be placed in 6-inch layers t o restore the ezbanlanents. I f t he damage is large the f i l l sha l l be made in the same manner as the original cos~struction;

homogenous r a t e r i a l from borrow pi ts , approved f o r the ?reject, s1?all be placed i n u?if orm hor4 zontal layers not more t l ~ a i l 6 inches in 61eL3t11 mci compacted t o a densibj equal t o the original e~rba%ent section.

b. Concrete and riprap, Damaged concrete or r iprap structures shall. be repaired promptly, Broken concrete suriaces and exposed reinforcement s t e e l shall be thorougliLy cleaned by c3Lpping or sandblasting and shall be b-:9lt up t o the ori,oinal dimensions; pnewnaticUd~ placed Portland c e m t mortar i s sat is- Factory for this work. Small cracks in the concrete may be f i l l e d wi%h asphalt. Any indication of settlement, up l i f t , o r f a i l u r e of concrete structures shall be reported by the Chief, Cons-bmction Division t o the Chief, Engineering Division, fo r analysis and f o r recorn-ze~~dation on remedial action, c, Seepage, indication of seepage t l ~ o ~ ~ g h the d a 2 shall be re-ported by the Chief, Collstruction Di-vision t o t he ChxLef,Engineering Division, f o r recommel?catio:a of remedial action,

d. Access roads and ber~ns. The access roads aild berms shall be adequa-bely ~S in ta ined f o r vehicular t rave l so tha t ~ r d i n a r y r&tenance df the- project and flood f ight ing operations w i l l be fac i l i ta ted .

e, Fences* >riaintenance of the fences sha l l hc1.u.de keepling (a) dL1 posts and braces firmly s e t and gates hung in coed -inernent; (b) barbed wires t i g h t and broken strcrilds repaired; (c) posts, braces and gates properly brush 9aitlted; (d) chains ztnd locks attached t o a l l ga-bes; and (e) gate keys a,vailable a t the dam tenderts house t o permit authorized t ravel throughout the property.

f 6 Burrowing anim& 6 Burrowing animals i n or nea,r the dam or the enibanlmnts sha l l be exterminated. Their runways and dens s h a l l be opened. up a d thoroughly compacted at the sene time they are e birclrfilled. Trapping and poisoning be used f o r the extermination 02 burrowing anirnals. IxCormation about other methods of animal.

extermination may be obtained fror;, the comty agricultural agent.

g. Hartarclous o b s t r u c t i ~ ~ ~ Reservation area used by czutiiorized personnel shall bs ke:>t f r e e f ron obs.tn~ctions tha t may cause injury or jrmpede inspections, maintenance; or flood f ight ing operations. I h t e r i a l s and auxiliary constrt~ction equtpment shall be stored i n such a way tha t they are not hazardous t o personnel, 4-01 Descri tion. The out le t s t m c t ~ ~ r c s and sii l lway are located ves t ----r of the junga 1.?asIi charinel i n I b s e n bob , which is on the axis of the dam and a ( y ~ o x b a t e l y bisects it. The out le t strvctures include an ap~roach channel, an intake s t ruc twe with 02erati.g house and vent house, eight gated and taro ungated out le t ' conduits and an outlet channel. The established regulated outflow of a b c ~ t 21,LrOO c.f .s. is obtained by the ccnbi~ec! operation of the gated and ungated outlets. The combhed maximum capacity of the out le t s is 21,900 c .f .s. a t reservoir elevation 1,060.0 (the spillway c res t ) of which 4,900 c.f .s. can pass through the mgated opexifigs and 17,000 c.f.s. through the gated openings, The excess capacity is deemed necessary i n the event of p a r t i a l cloggings of passages or -the inabi l i ty t o open one or more gates. (see drawing, f i le no.

b&/66, exhibit F)

4-02. Intake structure. The intake s t w c t w e consists of three mass blocks. The center block contains the two ungated out le t s and the ttJo s ide blocks contain the eight gated outlets. The invert elevation of the gated out le t is 990 and elevation of the entrance t o the ungated out le t is 1,Ol.l. Vpstream of the intake ogenings a r e three t r a sh racks with each u n i t being supported by a slab, top and bottom, and an intermediate arch with ve r t i ca l concrete columns t o support the actual s t e e l racks. Between the t b e e mass blocks and the syillway ogee a re two blocks of f i v e cor-iduits each, f o u gated and one ungated, the gates being located i n the spillway ogee. (see drawings, f i l e nos. 424/66 and L24/81, exhibit F)

a. Upstream w a l l s . From the upstream toe of the embank-merit t o the intake structure, the intake channel walls a re founded on rock and range up t o 46 f e e t i n height. From the intake s t m c t w e t o the gravity section, %he walis are fcunded on s t e e l bearing p i l e s driven to rock through the rol led impervious f i l l which i s placed upstremi f ron the gravity section. These w a l l s range i n 3eight from 5 f e e t t o approximately kS feet.

b. Downstream walls, The downstream spillway channel w a l l s a r e founded on rock or undisturbed earth. Heiglits r a g e from a3prorrimately 35 f e e t a t the gravity section t o a c o n s t a t height of d f e e t from s t a t ion 13+10. The eas t chamel w a l l s a r e counterforted or cantilever w a l l s . On the west side t o s ta t ion 12+50mss concrete is placed on rock t o chamel grade and t h e channel w a l l is cantilevered from %he mass concrete. There is a 10-foot bemn at the top of the wall and a rock-paved slope of 1 on 3 from the berm t o the intersection with the .downstream face of the earth dani,

c. Outlet channel ~ J a l l s e The outlet channel ssalls vary in height from a~proxha te ly 20 fee t near the gravity section t o a unifonn height; of-8 fee t at station 13+00. ~ h e s e w d l s are cantilevered from the outlet channel slab. (see drawing, f i l e nos. La/&, 424/69, 4&/71, 424/75, 424/76 and 424/77, e a b i * F)

4-04. Operating house, The operating house is erected on the t ~ e s t side of the spillway, having a floor elevation 1,087,s. It contains the hydraulic equipment for the operation of the gates, the mi tchboad fo r power and lights, the transf o m r vault, the standby motor generator u d t , one auxiliary and one service motor and pump wit, a gate position indicator panel, a f loat well, a crane hoist with a Cyclops $ton traveling crane and a 10 hp, 1,080 rpm, 60 cycle GE motor, a standard rain gage, an au.tomatic water level recorder, an o i l tank of 200 gallons capacity, a remote reading tank gage and one se t of telephone howlers. Two sets of red signal l ights mounted on the gate position indicator panel f lash visual signs of incoming phone cal1.s. A small addition bui l t along the north w a l l of the

"operating house is used f o r the dam tender's office containing a desk, f i l e cabinet, a 14otorol.a two-way radio, an o i l heater, a to i le t , two supply closets, one standard telephone and one crank-type phone t o the spreading pmds. Dimensions of the operatbg house are 29 f ee t 10 inches long, 21 f ee t 10 inches wide and 21 fee t 8 inches high, Belotr the operating house is a square shaft with a f l igh t of stairs descending t o the floor of the access tunnel t o the gate hoist chamber with f loor elevation 1,OOs.O. (see drawings, f i l e nos.

lr24/83 t o 424/86 inclusive and 424/92, exhibit F)

4-05. Vent house. The vent house i s located a t the east side of the spillway. It r i ses above the dam crest elevation 1,087.0, has a top elevation 1,096.0 and is crawned with a 24-inch diameter sheet m e w ventilator, containing an exhaust fan and motor, Belaw the vent house is a 3-foot s-e vert ical vent shaft which connects it with the access tunnel of the gate hoist chamber, having a floor elevation of 1,005.5, The south w a l l of the shaft is provided w i t h ladder rungs from top t o bottoa?. (see drawing, f i l e no, 4&/87, cuchibit F)

4-06. Outlet works. The outlet. conduits are installed through the overflow spillway section, located symmetrically with respect t o the spillway center l ine and aligned to discharge into Tujunga Wash, The established reguhted outflow of 21,!r00 c.f.s. may be obtained by the combined operation of eight gated outlets, 5 f ee t wide and 8 fee t high, with entrance invert elevation 990.0, and two ungated outlets, 8 feet wide and 6 fee t high, with entrance invert elevation 1,OU.O. The eight conduits f om two groups of four, separated by the ungated outlets i n the center of the outlet section, AU. conduit entrances are e l l ip t i ca l i n shape and have been provided with a sesni-circular trash rack structure. The ungated conduit throat entrances were made U f ee t by 8 f ee t t o increase the discharge of these conduits, A transition, about 60 fee% long, dropping from elevation 1,0ll,0 t o ap2roximate elevation 989 of the gc.ted conduits, i s used i n changing from the B foot by 8 foot throat t o the 8 foot wide by 6 foot h i h section. (see drawing, f i l e nos, 42h./74 and 4&/81, exhibit F f

4-07. Outlet channel. Below the condu5.t outlet portals three 30 foot long transitional. piers i n the center of the outlet channel and three 15 foot piers on each side are provided for smooth junction of the f l a ~ from the several conduits, Below the piers the outflow is carried in a rectangular concrete channel 98 f ee t wide for a distance of 50 f ee t beyond the outlet portal, thence through a 400 foot transition t o a channel width of 60 feet , By use of a 50 foot reverse c w e the channel invert is dropped immediately do~mstream of the outlet portal t o prevent any backwater i n the coaduits fo r the entire rgsrge of discharge, (see drawings, f i l e nos. 424/70 and 42h/U2, exhibit F) b-08. Inspections and maintenance. Each year, before the flood season starts, the dam tender or his assistants shall inspect the interior of the outlets and shall complete inspection check list no 4, as shown i n exhibit C, In addition t o inspection and maintenance work previously described fo r embanlanents, concrete and rip- structures and safety guasd fences, the dam tender shall perform maintenance work pertaining t o the outlet structures, This worlr i s described in the following paragraphs:

a, Channels. Channels shall be kept f ree of driftwood, trash, silt and other debris, The conibustible trash shall be burned safely i n areas removed from project structures. (see paragraph 3-ll) Incombustible accumulations shall be hauled away and dumped 3.n approved disposal areas, b, Wee holes. Weep holes in the linings of the a2proach and spillway c h m e --f-T s shal be kept clean. Plant growth, bird nests and animal den accumulations shal l be removed from the weep holes, using weed killer t o keep d m plant growth, and a piece of heavy wire, bent into a hook a t one end, to remove nests and a n b d den a c c m ~ t i o n s , S i l t deposits shall be removed from $he holes by flushing with a hose and n o z ~ e , SECTION 5

5-01. Spillway structure. The spill-way ~ t r ~ c t u r e , with a crest elevation of 1,060, is located near the center of the dcm on a proninent rock-me&. The spillway crest i s an ogee section with an overall length of 302 fee t and st% 3-foot wide crest piers, maldng a net length of 284 feet. A concrete-lined rectan,&ar chan-n-el, which

8 includes the outlet channel a t f t s center, is designed t o carry the spillway d5-sch:ge beyond the earth e~nbanlanent. The illway way channel consists of a 302-foot, constant width section t o the toe of the ogee section, and an B9Ffoot transition t o a width of 180 fee t a t the end of the channel a t elevation 964.0. (see draw-lngs, f i l e nos. L&/69, 424/70, k24/74 t o b2L/76, inclusive, &bit F)

5-02. bproach cl.lawle1, The approach channel, leading to the crest, is a 302-foot wide rectangulaz section, with Tnvert sloping from %he earth berm at elevation 1,040,O t o the point or" intersection with the concrete crest section a t elevation 1,050.0, The 12-inch t E c k concrete pavement is provided with a rider of 4-inch diameter weep holes, approxSn3tely 1s fee t a p r t and f i l l e d with gravel. An unusual feature of this spillway section is the Tact tha t there is rolled impervious earth fill against the upstream face t o within 10 fee t elevation of the crest. T h i s f i l l continues upstream f o r approxi-mately 186 fee t t o the b t ake structure. The prlmmy reason for this f i l l i s t o red1.1ce the height of the upstreat1 spLl1way w a l l s . - Sscondary effects w i l l be the reduction of seepage and uplif t , (see drawings, f i l e nos. W/69, 424/7k, &bit F)

5-03. Access tunnel. The access t m e l i n the gravity ogee section is reached from the operating house ~ J J nleans of an access shaft with w a l l s cantilevered from the gravibj section and leads t o the gate hoist chamber. A smaller access tunnel runs from the gate hoist chamber t o the vent shaft a t the east abutment. (see drawing3 f i l e nos. 424/73 and 424/78, exhibit F)

5-04. Spillway drains. A drainage and grouting gallery has been constructed near the rock l i ne in the daJn and high pressure gsmt holes a t 10-foot centers were dri l led t o approximately 50-foot depth below the base of the dam from tlie gallery on the down-stream and inside edges of the cutoff. Six-inch dPainage rel ief holes were dri l led a f te r high pressure grouting from the gallery through 8-inch black s t ee l pipe a t 20-foot centers. These holes were dri l led dawnstream fron the high pressure grout holes and are inclined a t an angle of approxhaLelj7 30 degrees from the vertical.

A 12-inch open joint t i l e drain is placed near the downstream edge of and parallel t o the cutoff. This drain is placed i n 18 inches of graded gravel, and 8-inch rel ief drains t o the dLrainage gallery provided a t 20-foot centers. From the drainage and grouting gallery, a 36-Fnch diameter drain pipe of extra heavy reinforced concrete, a2pro-tel-y 529 f ee t long, carries drainage into a drain manhole near the d0wnskrea.m toe of the embankment. It i s important that the manhole cover be secured against the entrance of unauthorized personnel. The banlcs on both sides of the spillway are protected by several rows of 4-inch diameter weep holes. (see drawhgs, f i l e nos. 2424/68, 424/69 and 425/52, exhikit F)

a. Intake slab. The i n w e slab is a 12-inch thick rein-forced concrete slab with weep holes and graded gravel pockets. This slab is locaAted upstream from the intake structure. A 6-foot deep concrete cutoff is provided at the'upstream end of th i s slab.

b. Spillway apron slab (up~tream)~ The sp-way apron slab extends from the eas t . to the west saillwa:~ w a l l s . The slab is 12 inches of reinforced concrete placed on 9 Gches of spalls with weep holes located a t about 1s fee t t o 20 fee t apart. A 4-foot concrete cutoff w a l l is provided a t the upstream end of t h i s slab.

c. SniUw slab. The spillway slab exbends from the da.~astrem end of -%-%r ha spi way ogee monoliths about 900 f ee t to the crib cutoff a t the end of tile sp%llway. A t the upstrean end the spill~~a;lr slab, exclusive of the outlet channel, i s about 200 f e e t wide and a t the downstream end, about 120 fee t wide. This slab is drained by 8-inch t i l e drains running transversely a t 30-foot centers. The slab is also weeped with 4-inch weep holes, each weep hole being over a graded gravel pocket, do Outlet channel slab* The outlet channel sltzls has the saxe upstream and downstream U t e as those of the spi%iway slab and is located in the center of the spillway channel; it is depressed relative t o the spillway slab 19 fee t a t the downsll~eam end 05 the ogee and 8 f ee t a t the downstream end of the s?illijay, The slab of the outlet chamel is drained by three 12-inch t i 1 2 drains se t in graded gravel under the slab. A t the downstream end

-l.roPZ these drains ape brought into the channel by means of cast ' subdrain risers. The slab has weep holes 10 f ee t apart both warm.

5-06. Spillway bridge. The spillway bridge i s designed i n accordance with the AASHO sta,n&ds 1935 for H-15 loading. A 2-way roadway w i t h a width of 23 feet is provided. The bridge is 302 fee t long and consists of seven simple spans, supported on six piers, 3-fee% thick, r is ing from the gravity ogee section and with abutments on the reA&ing w a l l s 'of tile end monoliths. (see draw-ings, f i l e nos, 421!4/39 aad h24/90, exhibit F) sgection and maintenance. The dm tender or his assistants shall perform periodic inspections and maintenance according t o paragraph 2-13, t i t l e d "Ftoutine inspection and main-tenance," and shall complete inspection check list no, 2, as shown in exhibit C, The spillway shal l be inspected a t least once each year during the dry season. Inspection and maintenance of concrete and derrick stone structures, ohanliels and weep holes, and the elimfnation of hasardeus obstructions have been previously described, SECTION 6

SERVICE G A T B &vB HOISTS

6-01. General, The control structure consists of t en rectan-gular condui-of which a re uncontrolled coliduits of 8 f e e t by 6 f e e t sections with the invert elevation 1,0ll,O and eight conduits of 5 f e e t by 8 f e e t sections, controlled by gates with invert eleva-t ion a t 990, The gate leaves, gate frames and extensions t o the gate frame a re high-strength cas t iron; the sea l s t r i p s on the gates and gate frames m e bronze. The weight of one sUde gate incluoling the automatic gate hanger assembly is approximately 85,000 lbs, The gates were designed f o r maxjmum hydrostatic head of t19 f e e t t o the center of the gate leaf, corresponding t o maximum high-water surface a t elevation 1,082,0, (see drawing, f i l e no. 424/96, exhibit F)

6-02, Gate controle The s l i d e gates a re hydraulically con-t ro l l ed from a manually operated valve manifold located i n the control room, A motor-driven high pressure rotary pump supplies o i l t o the gate operating cylinders a t a pressure of about 750 lbs. per square bch. The gate speed i s approximately one foo t per minute. A stand-by pumping unit, ident ica l with the r o t q pump mentioned above, is provided t o insure continuous operation i n the event of f a i lu re of the service punrp. The en t i r e system operates fu l l of o i l a t a l l times.

A 290-gallon o i l s t o r a ~ e tank is ins ta l led near the p n p s in the control room serving a s a receiver f o r any o i l t ha t m y be discharged from the hoist cylinders during operation. Each of t'ne two pumping m5ts consist of a 28-GPM pump a t 750 lbs , and a 15 hp, 3-phase, 220 volts, 6&cycle squi r re l cage induction motor. The control of f l u i d pressure is described i n drawing f i l e no, lca/93. (see draw-ings, f i l e nos, 424/94 and 424/95, exhibit F)

6-03, Automatic ate hangerso Loclcing of any of the eight gates a t any desired position between and including f u l l y closed ad f u l l y open, is accomplished by hydraulic automatic gate -ere mounted on the head of the gate operating cylinders and opened by the o i l pressure used t o operate the gates, V i s u a l indication t o the operator of the proper functioning of the &?.tomatic gate hanger i s afforded by a signal l igh t mounted on the gate indicator panel in t he control house, Each signal c i r cu i t is controlled by an individual switch on the indicator panel in corrjunction with a

0 mercury switch located on the gate hanger of each gate, The lock-ing device of each gate consists of clamping jaws which open and close on the gate stem extension, The ~ ~ 3 e r a t i o n is ent i rely automatic depending on the r i s e and f a l l of the pressure' exerted by the o i l used i n operating the gates. (see drawing, f i l e no, 42L/96, exhibit F)

6-04. Gate position indicators, Each gate i s equipped with a &ate posit ion scale with a gate opening indicator operated by a gate extension. dach of the eight indicators consist of a transmitting and a receiving unit. The transmitter is locatecl above the hydraulic hoist crl inder connected t o the gate extensior, i n the gate chamber and the receivbg u n i t i s mounted on a control panel located in the control room. T& gate osi t ion indicators shall be l e f t w i t h the e l ec t r i c

-Ti--power turned on a t a times t o prevent dampness from damaging the -- - - -t r a n s l ~ i t t e r s and receivers. (see drawing, f i l e no,, 4&/103, exhibit F)

6-05, Inspections, t e s t s , and maintenance. The dam tender or his assistan't;~ shall perform periodic inspections, t e s t s and nainte-name as described i n paragraphs 2-13 and 2-a, and shall complete inspection check l i s t no, 3 as shown in exhibit C and test-operation report f o r service gates, a s shown i n exhibit D.