LADM NO. 1130-2-18 Lopez Dam FCB O&M Manual 07-1963.pdf

LADM NO. 1130 -2-18

1203. I

LOS A N G E L E S C O U N T Y D R A I N A G E A R E A , C A L I F O R N I A

OPERATION AND MAINTENANCE MANUAL

FOR

LOPEZ FLOOD CONTROL RESERVOIR

U. S. ARMY ENGINEER DISTRICT, LOS ANGELES

CORPS OF ENGINEERS

JULY 1963

LADM NO, ll30-2-18 U* S* ma EWGmEZa DISTRICT, LOS ANGELES, AUGUST 1963

F O R E W O R D

1, T h i s mmual prescribes standard procedures for the operation and maintenance of the federally constructed Lopez Flood ConCrol Reservoir, Los Angeles County Drainage Area, California. All we-viou8ly issued operation and maintenance manuals for this dam are superseded by this mm&.

2, The Dams Section, Design Branch, Engineering Division, is responsible for the prepzwation of this manual and for keeping it up-to-date. Suggested revisions should be forwarded through channels t o that section, FOR THE DISTRICT EMGINBRr

(Zk&*&k TON B, BILES plkjor, C ~ S of Engineere Assistant Distrf c t Enghmr

CONTENTS - Continued

EXHIBITS

A Project location B General plan C Inspeation check list sample D -bit a-1 and n-2 E General Safety Requirements EN 385-1-1 unattached F f l A s Constructedn drawings unattached

OPERATION BM) MBINTEXMCE MANUAL

FOR

IQPEZ FLOOD COVfROL RESERVOIR

Section Z -' INTRODUCTION

1 . Authorhation. The project is a unit of the general com-prehensive ~ h n for flood control in the los Angeles County Drabage Area, Caljf o m y which was authorized by the Flood Control Act, approved 22 June 1936 ( ~ u b l l c Law 738, 74th congress) and extended and amended by subsequent Flood Control Acta of 1937, 1938, 19h , 1944 and 1946, The plan fo r the construction of Lopez Flood Control Reservoir, i n accordeuace with the recommendations contained i n the report, dgted U. A p r i l 1940, by the C h i e f of Engineers and submitted in House Document 838, 76th Congress, 3d session, was authorized by the Flood Control Act, approved 18 Augusf. 19%

1.02, Project looation. The Lopez Flood Control Reservoir is located aboun,200 f ee t upstream from the mouth of Pacoima Canyon i n the north-central part of San Fernando Valley, about 2.2 miles northeast of the c i ty of San F e r d o , and entirely within the c i ty of Los Angeles, The location of the dam i n relation t o other features of the com-prehensive plan f o r flood control i n the Los Angeles County Drainage Area is shown i n exhibit B-1 and drawing, file No, a511 exhibit F,

1.03. Draina e area. The drainage area is rough and broken, with the terra+ cu * y rmny steeply sloping canyons. The th in so i l s of the canyon slopes and the lack of ra in fa l l during the greater part of the year l i m i t vegetation t o a ~ p s e growth consisting mostly of l ive oak and chaparral, 4 t o 10 feet i n height, After f i res , which break out often in this growth during the dry seasons, the readily erodible s o i l is highly vnlnerable t o the erosive action of f l a s h floods, which are common in the area, The resultant debris-laden high velocity flood flms have damaging effects on the highly developed areas downstream from the m y o n mouth.

la'&, Purpose of reservoir. Lopes Flood Control Reservoir is an .

integral unit of the P a c o h - !Ch3uncl;a Wash cystem of tributaries t o the Los Angeles RSver. It w i l l pravide capacity fo r debris storage, a d forms a headworks t o direct flood and conservation flaws into the Pacoim Wash channel improvement. Flow i n excess of conservation needa are disoharged into the improved channel of Los Angeles River a t r iver mile 37.5 through the Tujunga IIash channel improvement. (See drawing, f i l e No. *5/1, exhibit F, )

1.050 The principal structures

comprise: ( feet low: (2) a re-inforced concrete broad-crested s p i l l w & with a crest bnrdth of ll0 feet and an outlet channel 562.48 feet long; (3) a pool drain oonduft of reinf'orced concrete pipe L28 feet long with a reinforced concrete infake tower; and (4) a gate well w i t h elide gate. (see drawings, f i l e Nos. a 5 6 , U / 8 , and &5/15, exhibit F.

1.06. Construction hfstory. Copfee of the contract for Lopes

Flood control Reservoir are on f i l e in the office of the District Engi-neer, Los Angeles District, Corps of Eagiaeers, Pertinent data on the contract are as follows:

Contractort V i n n e l l C-, Inc.

Contract No. o &Oh-353 ENG-3198 Work started: 1 April 1s Work completed and accepted: 1 December 1 9 a 6

1.07. Design memorandums. Design Memorandum NO. 1 on Lopert

Fload ~ o n t r o l ~ s s e m i r was prepared by the Corps of Engineers in Janu-ary 1$3. Design Wmorandums Nos. 2 and 3 were prepared in February 19%.

1.68. Pertinent data:

Drainage area Reservoir

Capacity

Dam Crest e l m t i o n Crest le*h Crest width l&ximm height above streambed 801Unle square miles 34 aore feet 209 earthfill feet 1,292 feet 1,300 feet 20 feet oubic yards

228,000

Spillway broadcrest

- Crest elevation f e d 1,266

Surcharge elevation ( epillway design flood) feet 1,287 hWth f erst 562 b8 Width feet 122 t o 30 spillway desim n o d 0.f 0 8 0 32, OOo

Pool drain Conduit length Condutt heride diameter Conduft intake elevattoa Conduit outlet elevation Intabe tower height Intake towm W i d e dimemiom feet inches feet f set feet r ~ t

SECTION 2 - GEXEWL PROCEDUFES

2,01, Approved regulationerr

a. Emergency Rnplaymsnt of Arqy Resources EM 500-1-1, dated 1 August 1961.

b, E$asrgency Flood Control Activities (under PL 99/84) Annex A t o Egtl $00-1-1, dated November 1961.

c Project Operatidon Maintenance Guide E#I 1130-2-303, dated 20 June 1960, d, Firefighter's Training Manual, dated October 1950, e, General Safety Requirements EN 385-1-1, dated 13 k a h V58.

f. Motor Vehicle hapecrtion - Technical lkmal. 38-660-1 Operator's Haintenance Instmotions and Procedures for Administrative Notor Vehicles, g, Ffre Prevention Code N.B.F,U.

h. National Electrioal Code, N.F.P.A.

2.02. Purpose of manual. The purpose of t h i s manual is t o supply the dis t r ic t operating persawel w i t h instructions for proper inspection, operation, and minteeance of the Lope54 Flood Control Reservoir. These

. instructions w i l l insure the continuous maintenanoe of structures and eqyipment and their operation 3.n such a manner and a t such times as w i l l obtain opthum beadi ts , 2,03. DefinLtiom. S p e c U r e d terms used in this manual defined a p f oUUW8:

%ngimeTfng Divisionn, Wonstmrction Divisionn and "Real.

Estate Divisionn refer t o organizations within the U. S. Arqy &I@-neer District, Corps of Engineers.

"Flood seasonm refers t o the period from 1s October t o 15 A p r i l , when most past flood9 have occurred.

nEmergemy flood conditionn refers to periods during whioh the reservoir water mfaca rises above the crest of the spillway at elevatfon 1,266.0 above mean sea level datum,

2.04. Reference drawinae. Drawing f i l e numbers in this maJlual refer to *aa-co&ructedn drawings, which are half' sise, separately bound, and included in exhibit F, which also includes ari -ex of a l l naa-constructed# drawings, 2.05, Functions of the Construction Difision. A l l progect inspection, operation, and maintenance functiom are under the juris-diation of- the Construction Division, with, the exception of those fo r hydrographfc ins ta l la t i0n8~

The Construction Division receives ax$ f i l e s all routine inspection and operation reports and participates i n engbebring inBpectiorrs--as described i n paragraph 2.07,

2.06. Fmctions of the Engineering Di-vision. The w e e r i n g Division p r e p w p h fo r tb project and, through i t s Hydrology and Reservoir ~ e & l a t i o n Section, directs the d i s t r i c t operator i n his operation of the gate. When lraj or repair of any p~.odect structure i s necessary, the Engineering Division makes surveys, and recommendations f o r repair a t the request of the Chief, Construction Division, The Engineering Divfsion keeps records of reservoir stages, inflow t o the reservoir, and spillway overflow, Responsibilities of the Engineering Division relative t o the 2nspection, semicing and maintenance of hydrographic installations are described i n paragraph h,02, 2.07, Joint functions of Construction and Engineering Divisions.

Imedhte ly after each emergency flood condition and each severe earth-quake, a qualified engineer -from the Engineering Division and one from the Construction Dixision shall inspect the project and shall report thei r findfngs in a joint report t o the Chiefs of the Engineering and Construction Divisions, 2,M. Duties of the d i s t r i c t operating personnel. The d i s t r i c t operator &oms the following functions f o r the Lopes Flood Control

Routine test operation, He services the recorder (winding the clock, instal l ing new record paper, etc. 1.

Operates the gate i n accordance with instructions from the Hydrolow and Reservoir Regulations Section, Guards the project against vandalism, sabotage, and fires.

Guards against unsafe conditions i n the project area.

P e r f o r m routine inspection and maintenance, Reports on trespassing and encroachment of right-of-way, M s i n W the best possible relations with cornunities interested i n the project.

2-2

2,09, Prevention of encroachment, or tr,espass. Any encroachment or trespass on the rights-sf-way that hinders the efficient operation and mahteneince of the project shall be prohibited. The dis t r ic t operator shall post *No Trespassing" signs a t conspicuow places on the projeot and shall report any usuresolved disputes to the Chief, Operations Branch, who in turri w i l l refer them to the Real Estate Didsion.

2,101 P e d t s for entry or use of rights-of-we Requests for permits for temporary right-of-entry or f o r use of Government-omed Gights-of-war shall be osefullg: considered t o determine that such use will neiP,he@ decrease the safety of the prodect nor hinder its proper functioning a t m y timec These requests shall be referred to the Englnwring Division through the Real Estate Division for appro-priate action,

2.11. Routine inspections and mintenanm, ?eriodic routine

inspectiom of structures andl equipment and of the reservoir area s a be nade by the d i s t r i o t operator t o determine maintenance measures that ass required, These inspection$ shall be made around 1 Oatober and 1 A@l, and JmPoediatgly following each flood. More frequent inspectiom SW be made if required for the safety and efficient maintenance of the project, During each impection, item8 requJshg main'csnance shall be checked and described on the inspection check list included as exllibit C. After eaoh inspection, one inspec-tion list sheill be promptly subdtted t o the Chief, Maintenance Sec-tion, who w i l l route i% t o the Desfgn B~anch, Engineering Division) one se t shall be subdtted to the Chie f , Operations Branch; and one set shall be retained by the dam tend=*

If mainteaace requires hiTing additional labor or eqdpment, the district operator 8haJ.l submit t o the Chi& Operations Branch, s Idst of proposed mahtenance measures. This i i s t may be omitted when dangerous conditions require immediate attention. Normal maintenance shall be mde without delay during the nonflood season, P ! repairs shall confomn t o standard engineering practice and to the deta9ls shown on the ~as-csnstructed~aH9ngs, exhibit F.

SECrIOM 3 - DESaIPTION AND MAINTENANCE OF PROJECT

a. The earth-ffll enbanbent has a crest length of appra- Mate* 1,303 fee t and a rnasdrrmm height of approxfmately 50 f ee t above the bed of P&ooba Wash. The crown width a t the crest elevation 1,292.0 is 20 feet. Upert~eam and downstream elopes of the embankment are 1 v&icd on 2 horizontesl tkoughout, The embankment has a t its center an imperviaer oore with a crest width of 12 feet st elevation 1,287.0 with alopes of J. vertical t o 1 horiaontal upstream andl downstream. The upstream and downstream portions of the embankment are pervious zones constructed of slaterial excavated from within the reservoir upstream of the dam and rook ~ a u a t i o n from the spillway site. (see drawings f i l e Nos. ltS/6 and exhibi* F. ) b, Mahtenance methods fm rep& o~ reconstruction of the embanbents shall depend upon the extent of the W g e d section, If the tarbaalaasnt damage i s smabl, sand and gravel or other coarse granular mterial may be p h e d in &hch laysrs t o restore the adoankment, If the damage is largd, the f i l l shall be made in the ssme nranner a s the or9ghal aonstructionj hamagenedw mate~ial from bmm pi t s approved for %he progect shall be placed in uniform hmisontal layers not more than 6 inches i n depth aad compacted t o a density e q d t o the original en-badmen* seetion.

3.02. S Uwa The reinforced concrete spillnag structure is

located et t dh+ e t abutment of the dam. Xt was designed as a combined outlet an8 sp$.Ilwyr D i s a k g e for the channel design flood is U,000 cubto feet pep seoond and POT the spfllway the design flood is 32,000 cubie feet per eecond. The spillway is an moontrolled broad crest type with the crelat a t elevation 1,266.0 and consists of a rectangular channel, &ending about 92 f ee t upst~?eam and about 470 fee t down-stream from the axis of the dam. It converges from a width of ll0 fee t a t the crest, or axia of the dam (station 10c60), t o a width of 30 feet a t the end of the spillway transition (station l4+70.48) wbre it

- , Jobs t he Pacoima Wash channel 4 An overflow section is prodded i n the right w a l l of the spillway channel between station 12+13 and station a+70,48 t o spill flows in access of l.b,000 cubSc fee t per second during a spillway design flood. (see drawings, f i l e Nos, I\lr5/7 t o lb5/l4, inclusive, exhibft F. )

3*03. A ~ r o a c h channel. The upstream approach channel has a reinforced concrete invert and vert ical w a l l s diverging upstream from the crest a t the same ra te as the darnstream convergence t o a channel base wjtdth of 122.0 fee t a t the beginning of the invert. The vert ical w a l l s terminate in quadrant walls forming the spillway approach. The tops of these quadrant walls are a t e l en t ion 1,286.2, A concrete cutoff w a l l extending t o a depth of 8 f ee t into rock i s constructed beneath the approach channel invert slab a t i ts upstream edge (station 9+l0) and aJ.ong the r ight side t o stat ion 10c10, (see drawSng, f i le No. l45/7, exhibit F. )

3.04. Pool drain A low level drain is provided t o enpty the

reservoir p o d g afbr the flaw over the spillway has ceased.

It is also-usled to pass-conservation flows which &e released by local interests from Pacofma Dam upstream from the reservoir. The drab is a cast-in-place, reinforced concrete conduit with a flat invert and an inside diameter of 60 inches. Other appurtenant features include a low level intake, a perforated fntake tmer , a conibination gate well and recorder well, and a diversion structure immediately upstream from the outlet into the spillway charmel.

The gate weU is provided with a 60-inch circular s l ide gate which remains closed exaept during periods of draining the low level pool or of passing conservation flows, Otherwise, debris w i l l be drawn into the conduit and the condlllet flow emerging from the pool drajn outlet t o join the flow over the spf32way will s e t up undesirable wave t - w c e i n the downstream spillway channelo

The low level intake structure is ewpped with removable s t e e l plates so spaced as t o perxnit the entrance of water but t o prevent the entrance of trash and debris.

The intake tower i s a cast-in-place reinforced concrete structure opening into the conduPt, The tower is 5 f ee t square inside and extends t o elevation 1,267 (one foot above spillway crest). It is perforated with 4-inch diemeter fosmed openings which permits the pool to be drained down in the event the low level intake becomes inope~ative, The avers ion structure near the downstream end of the conduit is a reinforced concrete box provided with s lo ts for stop logs and a 30-inch diameter circular s l ide gate, T h i s structure was provided $or the Los hge l e s Flood Control Distr ict and permits that agency t o divert las flows from the pool drain through the 38-inch gate t o the spreading grounds a short distance downstream from the dam, The 30-inch gate remains closed and the stop logs are removed a t all timea except when spreading operatiom are i n progress. Stop logs f o r the diversion structure are provided and maintaSned by the h s Angeles County Flood Control District, (See drawings, f i l e Nos. a5/7, and 145/15 to l&/18, inclusive, exhibit F, )

3.05. Gate well a d recorder well. The gate well and f loa t

recorder w e n s t m t w e consists of a %compartment reinforced concrete shaft, 10 fee t 6 inches by 3 fee t and &2 f&t deep inside, located i n the upstream embankment near the axis of the dasn (a t station 2*&). The gate well shaft i s topped with a sheet metal structure t o protect the pedestal gate Wt from vandalism. A concrete block structure covers the recorder well shaft and houses t h e recording equipment. Entrance is from the berm through a m e t a l clad door. The recorder well is fed from an intake structwe i n the reservoir, near the pool drain intake, through a &inch damtern. s t ee l pipe, encased i n concrete. The recorder well compartment is aleo connected w i t h the gate chamber by % short length of 3-inch diameter cast i r o n pipe equipped wi%h a gate valve, TMs connection permits flushing of the recorder well and pentiits the recorder well t o be fed either from the resemro&r intake or from the gate well when the 60-huh sl ide gate is closed. (see drawings, f i l e Nos. l45/7, 115115, 145136, and 45/18, exhibit F.)

3.Mr Pool clrain sl ide gate. A heavy-duty circular 60-inch diam-eter s l ide headgate with bronze seats is instal led i n the gate well.

Thie gate is raised and lowered by m e a m of a single gear gedestal lut, whi~h is mounted on top of the gate weU and equipped with a handcrank mechaaisni, One inch movement of the gate requiree 16 turns of the h d -crank, During periods of s p i l l w a y flow the gate should remain closed i n order t o e m t e undesirable turbulence in the dowt rean~ s p i n -way C ~ X U I ~ I ~ (see drawing, f i l e NO* l.&/16, exhibit F.)

3.07, Float we33 valve. A 3-inch ionrising &em, brass trimmed gate valve is provfded at the flanged end of' the short 3-Fnch diameter sast iron pipe connecting the f loa t recorder well and the gate chamber, The valve ~perat ing handle is located just below the floor level of the reoorder house, Far s&%isfactory operation of the recorder, this gate valve mst be kept olosed when the sl ide gate is open and water is f l ~ i n g through the conduit* (see drawing, f i l e TO. l45/16, exhibit F.)

3.08, Draina e s stem, The subdrainage system of the spillway ohannel corn rd-=- s hs o a network of 6-inch and 22-inch perforabd vi t r i f ied pip& which diaoharge into an 18-inch transve~se header a t station 12+00, Manholes are provided on either sidrs of the spillway t o p e d t access t o the header f o r inspection and Wtenance r From the manhole on the r ight side, a &-inch reinforced conorete pipe carries the under-drainage to s disposal point outside the spillway i n the natural wash, downstream from the dank, T t Is b p ~ r t a n t that the manhole covers be secured against the entrance of unauthsriaed personnel, Any indication of excess seepage through the dam shall be reported by the Chief, Constructf on Didreion, t o +the Chief, Engineering f31ri~f on, fo r recornen- &ti on of remedial action,, (See drawing, f i l e No, &5/Ih, exbibit F, )

0 a@ Pertinent requirements of the Code of Federal Regulations.

Flood Control Regulations, paragraph 208c10 (01, are woted i n part as f ollmer u (c) FloQd -bd.ls4 -- (1) W m t e w c e , Periodic inspections shall be made by the Superintendent t o be certain that1 (i) % * 4k.

(ii) No undue settlement has occurred which affects the s tabi l i ty of the w a l l or its water tightness; ( i i i ) * + 9, (iv) The concrete has not adergone craokhg, chipping, or breaking t o an extent which RLI. Mi affeot the s tab i l i ty of the w a l l or its water Wghtness;

(tf there are no encroachments upon the right-of-way which might endanger the structure or hinder its functioning i n time of flood;

(vi) 0-0 is being exeroi sed t o prevent a c c d a t i o n of trsrsh and debris adjacent t o wall, and t o insure that no f i r e s me being b u i l t near thera) (oii) * * * (a) 9 * *, Illgpeatlom s U be made fmnsdiertely prior t o the beginning of the flood season, fnrmediatgly following each major Ugh water period, and otherwise a t intervals not exweding 90 day& Measurea t o eliminate eacroacbments and effeot repabs found aeoessary by suok faspeotions shall be undertaken inmediate&, A l l . regpair8 shall be accomplishsd by nethods aaoeptable in standard engineerjag praotiue, W be Flood Cont~ol Regulations, parappph 208,lO (d), quoted i n part as f ~ U O W S ~ 't(d) Drainage s t n c t ~ e ~ r - - ( l ) W t e w C e r Adequate meamreer shall be taken t o inswe that i d e t and outlet channels are kept open and that tlrash, drift or debris are not allowed t o aom-d t e new drainage structures, * -E * manually operated gate8 and valve8 on drabage struetwes shall be examined, oiled and trisll operated at least onoe every 90 days, Wherd drainage atrus%urt3s are prdded with stop log or other emergenay closures, the oondition of the e@p-m n t an8 i6s housing shall be in~peuted regularly and a t r i a l installa-tion of %he emsrgenay blaerure rahall be ma& at l eas t mte each year, P e r i a o inspeckions shaU be made by the Superintenden% t o be iaertsjm t h a t 8 (i) Pipes, gates, operating mechanism, ripra cand headwalla are i n good co&%ionj (fi) M e t and outlet c h m I' s are open;

(It&) owe is b6hg emrofsed t o prevent the a o d t i o n of t rash and debpis new the $tntcatwe * * * ( iv) * * *, h e d i a t s stepe wiJ3 be taken t o repair damage, replace &sing or broken parts, or remedy tadverse oondition8 disclosed by euch inspeotfons r

3J0, Fenme, Safety gumd feneeer are provided along the tops of the o o n o r ~ e on sacch side of the 8pZUway. Thay o ~ n s i s t of 2-inch dimmnd, meeh galvanioed ohah ULBk fencing, 3 f ee t high, trbretahed an8 fbdly secured t o ~ - h c h diameter galvaninred s tee l pipe fence poste and. braes, and topped with two etrctnda of garlvanised barbed wire, lkb temce of the safety guard feneee and rights-of-way o h i n s shall inalude keeping (a) Une posts fhdy set3 (b) basbed wire t ight and h o h a &ran& repabe& ( a ) comer poets and b r a e s firmly set3 and d) posts and &*aces, t h a t requjse paint properly brush m t e d , d.t8ee dlpawlag~, f i l e NOS. llr5/8 and l45/1b, extabit F. )

30Ua d concrete or riprap stmctures shall be re re te surfaoee and exposed rsinfo3)crae& s t ee l e m be thorOq$hl;y 6leaned by chipping 61: sand-blasfing and shall be buf lt up t o the original dhenaions j prim matfadly p b c d gorthnd amen+ mortar ie satisfactory for this work, 3mrrbZ. craoks in %he ooncrete may be f i l l e d with asphaltp Any iadio8-tfon of s e t ~ l w n t , up l i f t or fai lure of concreke structures ehall be reported by the Ohid, Cons%motion Division, t o the Chief, &&neering Didsion, for atldysf8 arnd for rec-ndatlon o.r remedia3 attion, %12* Burrowing animals, causing damage ftl or near the ated, Runways and dens s h d l be opened and the space backfilled and thorouguy compaoted. Trapping or poisoning mag' be used for the extermination of burrowing animals.

Information about other methods of animal extermination may be obtained from the comty agrf cnzltural agent.

1 . Paoaima Wash bridge. The highway brid e across Pacoima 5 Wash a t MCCI-met oonsists of a single span 532 fee5 10%. The concrete deok I s supported on structural s t ee l b e ~ r The concrete abutments and wZag w a l l s have spread footfngsr The bridge was desigped t o pass a d i a o k g e of 4,000 cubic feet per seaond with a depth of flow of 6 fee t under the bridge, To protect the footings from scour action, the footing errtoamtion on the ahannel aldlss was backtilled with coarse laaterial fromthe stremibed. The bridge was ocomtmcted as a re-plmement for a c i ty bridge which was removed as part of the relocation of McClay Stmet due t o the construction of the dsm, Tit le t o the new bridge and estrwt is v e ~ t e d i n the City of Los Angeles, and the City lhgineer is reqonsible for operation and Ipaintenanoe, (see drawings, f i l e Nos, l45/21 and 1k4/22, exhibit F.)

SECTION 4 - HYDROGRAPHIC IlSTALLATIONS

1.01. Gages. Six staff gages, each 5 fee t high, are located

on the western end of the upstream enibanlanent near the pool drain intake tower and ascend t o the mximuin reservoir water m f a c e elevs-tion. One staff gage, 10 fee t high, is attached t o the-ou-We of a the tower i t se l f . The gages cover a range from elevation 1,247 t o 1,285 and are graduated i n fee t and tenths of feet. The recorder house contains a Stevens water-stage recorder, equipped with a s t ee l tape gage and operated by a f loa t i n the well. (See drawings, f i l e Nos. 45/7 and l45/15, exhibit F. )

4.02. Inspection, servicbg, maintenance, and reportine;. Inspec-tion, s e ~ v i c b g , ;strict operathg personnel and the IQdrology and Reservoir Regulation Section of the Engineering DirLsion. The d i s t r i c t operator shall perforre periodic inspections and maintenance of the hydrographic installations, and he shall complete inspection check list as shown i n exhibit C.

He shall keep the backboards for the staff gages firm and well painted, and the gage faces clean. Weeds shall be cleared from the vicinity of the staff gages. Upon receivfng written instruction from the I-fydrology and Reservoir Regulation Section, the operator shall remove silt accumulations from the f l oa t well and the intakes t o f l oa t well and pool drain, and perform routine erervicing of the gages. He shall wind the clock of the recorder and install new reeord papers; he shall g w d the proJect against vanddh~, sabotage, f i r e or nasafe conditions, He sha l l report cases of trespassing aud encroaohmnt of rights-of-way.

D DRAWING-AS CONSTRUCT€

~ L - ~ S ~ . . ~ . . ; . . - M ~ ~ . L E ~ L ~ P ~ ~ ~ ~ I L L ~ ~ P !

373 PREVIOUS EDITIONS ARE OBSOLETE J U L 63 EXHIBIT C

DATE

REPAIR

COMPLETED

Engineering Div., r

I T EM

NO.

One and

DESCRIPTION OF DEFICIENCY AND RECOMMENDED REPAIRS

c l~eck l i s t t o be submitted to the Chief , Maintenance Section, who will route it to the Design Cranch, one checklist to he submitted t o the Chief , Operations Cranch, Construction Div.

U- So ARMX ENGWEER DISTRICT ,@S ANGELES, CORPS EF ENGINEBE3

REF'um OF STAmBY rnTS ON F r n D COKTrnL PhI)JECTS

BATE

. STQPrn No. 2 S T ~

STOPPED

No* 3 STAm'ED

STOP-

Engine Fuel on hand gauons . BE%-

Operate a t least 30 minutes on the bt and 16th of each month. Prepam i n triplicate; 2 copies to Operatioas Bnnch.

Damtender

I I I I I I I I

SPL 'On 3u ~mvious eation. a n oboobte 18 Apr 63