LADM NO. 1130-2-5 Mojave River Dam FCB O&M Manual 10-1972.pdf

L A D M NO. 1130-2-5

OPERATION AND MAINTENANCE

MANUAL

FOR

MOJAVE RIVER DAM

MOJAVE RIVER BASIN

IN

SAN BERNARDINO COUNTY,

CALIFORNIA

DEPARTMENT OF THE ARMY LOS ANGELES DISTRICT

CORPS OF ENGINEERS

OCTOBER 1972

LADM NO. 1130-2-5 DEPARTMENT OF THE ARMY, LoS ANGELES

DISTRICT, CORPS OF ENGINEERS

OCTOBER 1972 -

F O R E W O R D --------

1. This manual prescribes standard procedures f o r the operation and maintenance o f the federa l l y constructed Mojave River Dam, Mojave River Basin, San Bernardino County, Cal i fo rn ia .

2. The Operations Branch o f the Construction-Operations Div is ion i s responsible f o r the preparation o f t h i s manual and f o r keeping the manual up-to-date. Suggestions f o r revis ions should be forwarded through channels t o t h a t branch.

3. A l l e xh ib i t s not attached t o t h i s manual may be found i n the Operations Branch, Construction-Operations Div is ion.

A%*/ H . McK. ROPER, ,d .

COLONEL, CE

- w

D i s tri c t Engineer

TABLE OF CONTENTS

TITLE PAGE

PART I . GENERAL

In t r oduc t i on

1 . Author i ty 2 . Purpose 3 . Parts o f Manual 4 . Scope o f Manual

Pro jec t Descr ipt ion

Author izat ion Pro jec t l oca t ion Descr ipt ion o f p ro j ec t ..................................... 2 ............................................... Access roads 3 Pro ject Contracts .......................................... 5 .. ................................... Construction H is to ry .. 6

PART I1 . OPERATION AND MAINTENANCE

General

................................................ Informat ion 6 ............................. Reference drawings and manuals 7 .......... Functions of the Construction-Operations D iv i s ion 7 ...................... Functions of the Engineering Div is ion 8 Functions o f the Real Estate D iv i s ion Functions of the Department o f I n t e r i o r Geological Survey .. 8 ............................. Functions of the Safety Office 8

Embankment and Reservoir Area

8 . Inspect ion and maintenance

Out le t Works and Spi l lway

................................. 9 . Inspection and maintenance 10

NO . TITLE PAGE

Communi c a t i ons Faci 1 i t i e s

10 . Radio f a c i l i t i e s .......................................... 10 ........................... 11 . Maintenance of rad io f a c i l i t i e s 10

Hydrographic I n s t a l 1 a t i ons

.................................... ............. 12 . General .-. 10

Foundation and Materi a l s Instrumentation

............... 13 . Instrumentation provided a t Mojave River Dam 11 ....................................... 14 . Observation schedule 12 ............ 15 . Responsibi l i ty f o r instrumentation measurements 12 .................. 16 . Instrumentation data analysis and reports 12

Coordination w i t h Other Agencies

................................................. 17 . Archeology 13

NO.

EXHIBITS

TITLE

...................................... A. Project Location... 2 Sheets

......................... B. Drawings Hal f-Si ze (Unattached).

............................... C. Inspection Check List . . . . . 1 Sheet

D. Dam and Appurtenances - Embankment Instrumentation. ...... 1 Sheet

E. Saddle Dike Instrumentation .............................. 1 Sheet

..... F. Mojave River Recreational Faci 1 i ties- General Plan.. 1 Sheet

OPERATION AND MAINTENANCE MANUAL

FOR

MOJAVE RIVER DAM

MOJAVE RIVER BASIN

SAN BERNARDINO COUNTY, CALIFORNIA

PART I - GENERAL

In t roduct ion

1. Authority.-- This manual was prepared pursuant t o ER 1130-2-304 whi ch d i rec ts the preparation and prescribes the coverage o f operat i on and maintenance manuals f o r completed c i v i l works pro jec ts operated by the Corps o f Engineers.

2. Purpose.-- The purpose o f t h i s manual i s t o provide guidance and ins t ruc t ions t o the D i s t r i c t personnel i n the proper operation and maintenance o f Mojave River Dam. These ins t ruc t ions w i 11 insure con ti nuous maintenance o f s t ruc tures and equipment and t h e i r operat i on i n such a manner and a t such times as w i l l obtain optimum benef i ts .

3. Parts o f Manual .-- This manual has been prepared i n two parts.

Part I - qives a qeneral descr ip t ion of the completed pro jec t . Par t II-covers operations-and ~a in tenance ins t ruc t ions f o r the- major and c r i t i c a l p ro j ec t equipment and f a c i 1 i t i e s i n s t a l l e d a t Mojave River Dam.

4. Scope o f Manual .-- The scope of t h i s manual i s l i m i t e d t o essent ia l operation and maintenance ins t ruc t ions and describes the operating parts, t h e i r purpose and technique o f operation i n s u f f i c i e n t d e t a i l t o insure proper operat i on.

Pro jec t Descr ipt ion a 5. Authorization.-- The f lood cont ro l p ro j ec t was authorized by Act o f Congress, Public Law 645, 86th Congress, 2nd Session, approved 14 Ju ly 1960, author iz ing the construct ion o f ce r ta in pub l i c works on r i v e r s and harbors f o r f l ood cont ro l and other purposes. The p ro j ec t f o r the Mojave River Dam on the Mojave River, Ca l i fo rn ia was authorized i n House Document No. 164, 86th Congress. /,

6. Pro jec t location.-- The p ro j ec t which i s i n San Bernardino County, Cal i fo rn ia , i s about 14 miles south o f the City of V i c t o r v i l l e and 8 miles southeast o f the Town o f Hesperia. (See Exh ib i t 8 . ) The Mojave River damsite i s located on the Mojave River j u s t below the confluence o f West Forks and Deep Creek and on the southern edge o f 1 the Mojave Desert a t the f oo t o f the San Bernardino Mountains.

State Highway 140. 173 connects the p ro j ec t w i t h I n te r s ta te Highway 15, which i s the main east-west highway serv ic ing the area.

7. Descr ipt ion of project.-- The p r i n c i p l e construct ion features o f Mojave River Dam are:

a. Reservoir.-- The construct ion o f Mojave River Dam forms a reservo i r t o provide storaqe f o r f l ood cont ro l only. At sp i 1 lway crest, e levat ion 3,134, the reservo i r has a gross capacity ' o f 89,700 acre-feet, inc lud ing an allowance o f 11,000 acre-feet f o r sediment storage. The reservoi r regulates the standard p ro j ec t ( reservo i r design) f l ood from a peak i n f l ow o f 94,000 cubic f ee t per second t o a peak out f low o f 23,500 cubic f e e t per second. (See drawing 3411145 of Exh ib i t B.)

b. Embankment.-- The embankment i s a zoned r o l l e d e a r t h f i l l s t ruc tu re w i t h an upstream slope o f 1 ve r t i ca l and 2.5 hor izonta l , faced w i t h 18 inches o f Type I stone. The downstream slope i s 1 ve r t i ca l and 2.2 hor izontal , faced w i t h 12 inches o f Type I stone, w i t h a p ro tec t i ve toe o f 5'6" t h i c k and 10 f ee t h igh o f Type I stone.

(See drawing 3411146 o f Exh ib i t B. )

c. Spil lway.-- A detached, broadcrested sp i l lway w i t h a c res t e levat ion o f 3,134 feet , and a crest length o f 200 f ee t i s located on the r i g h t abutment o f the dam. The sp i l lway channel i s a re in forced concrete rectangular sect ion founded i n rock. (See drawing 3411159 o f Exh ib i t B. )

d. Out le t works.-- The o u t l e t works i s located i n the l e f t abutment o f the dam, and i t consists o f an approach channel w i t h l o g rack, and ungateed-1 i ned tunnel , and an o u t l e t channel . (See drawing 3411168 o f Exh ib i t B.)

(1) Approach Channel.-- The approach channel i s 34 f e e t wide and 200 f e e t long. It consists o f 101 f ee t o f unl ined trapezoidal channel, 99 f ee t o f re in forced concrete trapezoidal channel, and a Steel l og rack w i t h 9 by 11.83-foot openings. (See drawing 341/173 o f Exh ib i t 6.) •

(2) Tunnel. -- The tunnel i s a concrete-l ined D-Section bore w i t h an ins ide width o f 19 feet , height o f 17.75 feet , and a length o f 1,002 f ee t ( inc lud ing i n l e t t r ans i t i on ) . The i n v e r t e levat ion o f the tunnel i s 2,988 f ee t a t the i n l e t po r t a l and 2,966.72 fee t . a t the o u t l e t po r ta l . (See drawings 3411174 and 3411175.of Exh ib i t B.)

e. Saddle dike.-- The sadd le d ike is a zoned r o l l e d e a r t h f i 11 s t r u c t u r e wi th an upstream s l o p e o f 1 v e r t i c a l and 2.5 ho r i zon ta l f aced wi th 2 feet o f Type I1 s tone ove r 1- foot l a y e r of Type I s tone .

The downstream s l o p e i s 1 v e r t i c a l and 2.2 ho r i zon ta l faced wi th 1-foot o f Type I s t one . The t o e o f t h e upstream and downstream s lopes a r e p ro t ec t ed by extending t h e f a c i n g s t o n e 10 feet h o r i z o n t a l l y where t h e s l o p e i n t e r c e p t s t h e e x i s t i n g ground su r f ace . (See drawing 341 11 53 of a Exh ib i t B.)

8. Access roads.-- Access t o t h e p r o j e c t is provided by Arrowhead Lake Road and S t a t e Highway No. 173. Access f o r maintenance and in spec t ion o f t h e dam, s a d d l e d ike and sp i l lway is provided by a paved road ( s ee drawing 341 / I45 o f Exhi bi t B) . This road extends from Arrowhead Lake Road over t h e s add le d ike and dam t o t h e sp i l lway , then down along t h e downstream s l o p e o f t h e r i g h t abutment p a r a l l e l i n g t h e sp i l lway t o an e x i s t i n g unimproved road. Access t o t h e i n l e t p o r t a l o f t h e tunnel is from a branch road running down t h e upstream s l o p e o f t h e dam and para1 l e l i n g the l e f t abutment t o t h e i n l e t p o r t a l .

A branch road t o t h e o u t l e t p o r t a l o f t h e tunnel l eaves t h e dam access road a t approximate s t a t i o n 22+50 c ros s ing along and down t h e s l o p o f t h e dam t o t h e o u t l e t p o r t a l and then cont inu ing on t o S t a t e Hi ghway No. 173. Turnouts a r e provided along t h e top o f dam and sadd le dike. Also, turnarounds and parking a r e a s a r e provided a t both ends o f t h e dam and sadd le d i ke. Access f o r t h e U . S. Fores t ry Se rv i ce f i r e - f i g h t i n g equipment and t h e f o r e s t r y flume t r a i l , east o f t h e s p i l l -way is provided by t h e paved road c ros s ing t h e s add le d ike and dam.

! MOJAVE RIVER DAM

PERTINENT DATA

Drainage area :

Dam ( r o l l e d e a r t h f i 11 ) Crest e levat ion Streambed e levat ion Max. hei ght above streambed Crest length Freeboard

Spi 1 lway (detached, broadcrested) :

Crest e levat ion Crest length Elevat ion o f max. water surface

Out le t works :

Tunnel Length Intake i n v e r t e levat ion Out le t i n v e r t e levat ion

Saddle dike:

Length Crest e levat ion Max. height above ex i s t i ng ground

Reservoi r:

Area at-- Spi 1 lway c res t Max. water surface Dam c res t Capacity (gross) at-- Spi 1 lway c res t Max. water surface Dam c res t

Storage a1 1 ocation below sp i 1 lway crest :

F l ood cont ro l Sedimentation

Standard p ro jec t f lood:

Total volume 3 days Peak i n f l ow Peak outf low Drawdown time ( t o empty)

Maxi mum probable f 1 ood:

Total volume 5 days Peak i n f l ow Peak out f low Drawdown time ( t o sp i l lway c res t )

sq. m i l e ft.. m. s. 1.

ft. m. s. 1.

ft.

ft.

ft.

ft. m. s. 1.

ft.

ft.

ft.

ft. m. s. 1.

ft. m. s. 1.

ft.

ft. in. s. 1.

ft.

ac.

ac.

ac.

ac. -ft.

ac.-ft.

ac.-ft.

c. f. s.

c. f. s.

days

ac. oft.

c.f.s.

c.f.s.

day

9. P ro jec t Contracts .-- Construct ion o f Mojawe River Dam was accompl ished by the f o l lowing contracts :

a. Foundation Explorat ion (Spi 1 lway , Dam Foundation, Abutment)

Contractor:

Contract No:

Speci f i cation:

Work Started:

Work Completed:

, b. Borrow Area Explorat ion

Contractor :

Contract No:

Spec i f ica t ion:

Work Started:

Work Completed:

Fred Cannon 64-1 46 64-29 15 June 1964 17 August 1964

Paul ~ u b b s Construct ion Co.

65-1 57 65-31 24 May 1965 23 August 1965

c. Foundation Explorat ion (Abutments & Foundation o f Dam, Tunnel , and Spi 1 lway)

Contractor: Fred Cannon Contract No: 65-147 Speci f i cation: 65-28 Work Started: 15 Apri 1 1965 Work Completed: , 24 August 1965

d. Foundation Expl o r a t i on (Spi 1 lway , Tunnel )

Contractor:

Contract No:

Spec i f ica t ion:

Work Started:

Work Completed:

Fred Cannon 67-C-0018 67-B-0010 1 4 November 1966 3 March 1967

e. Foundation Explorat ion (By tunnel and approach exc. )

Contractor:

Contract No:

Spec i f ica t ion :

Work Started:

Work Completed:

Carl L. C ra f t 67-C-0020 67-8-001 5 28 November 1966 23 February 1967

f. Arrowhead Lake Road Relocation

Con t r ac to r : So-Cal Construction Inc. 81 C. K. Evans, Inc.

Contract No: 67-C-0073 Speci f icat ion: 67-B-0032 Work Started: 10 Ju ly 1967 Work Completed: 12 February 1971

g. Dam and Appurtenances

Contractor:

Contract No:

Speci f icat ion:

Work Started:

Work Completed:

Kasler, B a l l & Yeager 68-C-0028 68-8-0012 25 March 1968 18 November 1971

10. Construction History. -- The construct ion o f Mojave River Dam began i n Ju ly 1967 w i t h the re locat ion o f Arrowhead Road. I n March 1968, the general overa l l construct ion o f Mojave River Dam began w i t h the excavation o f the o u t l e t works channel and overlook area, c lea r ing and grubbing of reservoir , the placement o f rock b o l t i n g and w i r e ne t t i ng around tunnel i n l e t . The second phase o f construct ion s ta r ted i n mid-summer and i n -volved the excavation and l i n i n g o f tunnel, re loca t ion o f sewer l i n e and the divers ion o f West Fork and Deep Creek Channe.1 away from tunnel i n l e t .

During t h i s phase o f construct ion major s l i des occurred a t the i n l e t and o u t l e t faces o f the tunnel ; which required the tunnel t o be lengthened and backf i 1 led. The t h i r d phase o f construct ion i nvol ved excavati on o f cu t -o f f trench t o streambed, spi 1 lway excavation, and abutment excavation.

The four th phase o f construct ion began by d i ve r t i ng water from cu t -o f f d ivers ion through tunnel, construct ion o f cofferdam, excavation o f cut-off trench, abutment and sp i l lway and the grout ing above and below streambed. The embankment was topped out i n December 1970 and the concrete placement o f the sp i l lway was completed A p r i l 1971. Mojave River Dam was t ransfer red f o r Operation and Maintenance i n May 1971.

PART I1 - OPERATION AND MAINTENANCE

General

1. Information.-- Special terms used i n t h i s manual are:

a. "Flood Season" - re fers t o periods October through Apri 1 (general w in te r storms) and Ju ly and August ( loca l and general summer storms).

b. "Emergency Flood Conditions" - re fers t o periods *dur ing which the reservo i r water surface reaches e levat ion 3,134 -spi l lway crest.

c. A l l e levat ions r e f e r t o "mean sea l e v e l " datum.

2. Reference drawings and manuals.-- Drawing f i l e numbers i n t h i s manual r e f e r t o llas-constructedll drawings ; ha1 f - s i ze reduct i ons are included as Exh ib i t B and are separately bound.

3. Functions o f the Construction-Operati ons Div is ion. -- Operati on and maintenance and a l l inspections are under the supervision of the Construction-Operations ~ i v i s i o n , which assigns t h i s ' responsi b i 1 i ty t o the Operations Branch. The general dut ies include the fo l lowing:

a. The Operations Branch sha l l t r a i n key personnel i n order t h a t regul a r inspection, operat i on, and maintenance work w i 11 be performed e f f i c i e n t l y and t o insure t h a t unexpected problems re la ted t o flood-cont ro l may be handled i n an expeditious and order ly manner. The men sha l l become fami l i a r w i t h the provisions o f t h i s manual, the supple-ments A, B, and C o f LAD OM 500-1 -1 , and the "as-constructed" drawings.

b. The Operations Branch sha l l repor t v io la t ions o f outgrant terms t o Real Estate Div is ion f o r o f f i c i a l ac t ion when they cannot be handled in formal ly .

c. The Operations Branch prepares and executes a1 1 f 1 ood-fi gh t i ng plans, and maintains records o f reservo i r stages, i n f l ow t o the re-servoi r, outf lows through the o u t l e t s t ruc ture , and spi l lway flow.

d. The Reservoir Regulation Section, Operations Branch i s re-sponsi b l e f o r the inspection, serv ic ing , and maintenance o f a l 1 hydrographic i n s t a l l a t i o n s and rad io i ns ta l l a t i ons .

e. Per iodic inspections sha l l be made by the Engineering Evaluation and Maintenance Section, Operations Branch, i n order t o determine maintenance measures necessary t o insure se rv i ceab i l i t y o f the f l ood p ro j ec t i n time o f f lood. Such inspections sha l l be made immediately fo l l ow ing each major highwater period, a t i n t e r va l s no t t o exceed s i x months, and a t such other times as may be necessary. Immediate steps sha l l be taken t o cor rect dangerous condit ions disclosed by such inspections, and regul a r maintenance repai r measures sha l l be accomplished dur ing the appropriate season as scheduled by the Chief, Operations Branch. A l l repairs sha l l be made i n accordance w i t h standard engineering pract ice t o l i ne , grade, and q u a l i t y and i n accordance w i th re levant detai 1s shown on "as-cons t ructed" drawings , Exh ib i t B.

f. The Engineering Evaluation and Maintenance Section, Operations ' Branch, reviews plans and furnishes comments t o Real Estate D iv i s ion on requests from pub l i c o r p r i va te in te res ts f o r co l l a t e ra l use o f land and water areas and performs inspections during construct ion t o assure compliance w i t h approved plans.

g. The Engineering Eva1 u a t i on and Maintenance Section, Operations Branch, sha l l es tab l ish a f i l e o f a l l reports and records concerning the maintenance and operation o f the p ro jec t works.

Functi ons o f the Engineering Div is ion. --

a. Conducts o r par t i c ipa tes i n per iod ica l condi ti on surveys o f the p ro j ec t w i t h representat i ves from Construct i on-Operations D i v i sf on, South P a c i f i c Div is ion, and O f f i ce o f the Chief o f Engineers, These surveys serve a two-fo ld purpose: (1) ascerta in the condi t ion o f the various par ts o f the pro jec t ; and (2) see t ha t a l l repa i rs and improve-ments have been car r ied out t h a t were previously recommended.

b. Performs engineering review o f plans o f proposed development on p ro j ec t land o r water areas, as requested by the Construction- Operations Division.

c. Furnishes engineering comnents on request o f pub l i c o r p r i va te in te res ts f o r c o l l a t e r a l use o f land and water areas as requested by Construction-Operations Div is ion.

d. Reports t o Construct i on-Operations Div is ion a1 1 trespass o r v i o l a t i o n of outgrants discovered by Engineering D iv i s ion personnel,

5. Functions o f the Real Estate Division.--

a. Processes a1 1 permi t s , 1 i censes , easements, o r leases through appropriate channels and administers completed instruments .

b. Insures compl i ance through per iod ic inspections and acts upon a1 1 v io la t ions o f outgrants.

c. Furnishes the Construction-Operations D iv i s ion copies o f a1 1 permits , 1 i censes , easements, o r leases.

6 . Functions o f the Department o f I n t e r i o r Geological Survey. -- By agreement w i t h the Corps o f Engineers, the I G S services the out f low gaging s ta t ions below the dam on the Mojave River and the i n f l ow gaging s ta t ions above the dam on Deep Creek. The I G S makes discharge measure-ments and compiles and publishes the per t inen t records i n the U. S.

Geological Water Supply papers.

7. Functions o f the Safety Office. -- A l l functions i nvo l v i ng safe ty are under the supervision o f the Chief, Safety Off ice. The Safety Of f i ce sha l l perform per iod ic inspections t o insure compliance w i t h appropriate safe ty codes and standards o f a l l a c t i v i t i e s i n the p ro j ec t area.

Embankment and Reservoi r Area

8. Inspection and maintenance.-- The Chief, Engineering Evaluation and Maintenance Section shall perform periodic inspections and maint-enance and shall complete inspection check l i s t as shown i n Exhibit C.

Maintenance work i s described i n the fol lowing paragraphs :

a a. Embankment.-- Maintenance methods for repair or reconstruction of the embankments shall depend upon the nature and extent of the damaged section. I f the embankment damage i s small, sand and gravel or other coarse granular material may be placed i n 6-inch layers t o restore the embankment. I f the damage is large, the f i l l shall be made in the same manner as the original construction; homogenous material from borrow pits approved for the project shall be placed in uniform horizontal layers not more than 6 inches in depth and compacted t o a density equal t o the original embankment section.

(See Exhibit B . )

b. Riprap.-- Riprap on the upstream and downstream side and the toes and rock-paved gutters shall be repaired promptly. An indication of settlement, upl i f t , or fai lure of the riprap structures shall be reported t o Chief, Operations Branch, for recommendation on remedi a1 acti on.

c. Burrowing animals.-- Burrowing animals i n or near the dam shall be exterminated. Their runways and dens shall be opened, backfi 1 led and the backfi 11 thoroughly compacted. Trapping and poisoning may be used for extermination of burrowing animals. In-formation about the best methods of animal extermination may be obtained from the County agricul tural agent.

d. Access and service roads.-- Access and service roads shall be adequately maintained for vehicular travel so that maintenance of the project and flood-fighting operations w i 11 be fac i l i ta ted .

e . Fences. -- Maintenance of the safety guard fences shall i ncl ude :

(1) Line posts t o be firmly s e t and gates hung i n good alignment.

(2) Barbed wire t ight and broken strands repaired.

(3) Corner posts, gate posts, and braces firmly se t .

(4) Chains and locks attached to a l l gates.

f . Hazardous obstructions.-- Dam area used by authorized personnel shall be kept free from obstructions that may cause injury or impede inspection, maintenance, o r f l o o d - f i ght ing operations. Materi a1 and equipment sha l l be stored i n such a way t h a t they are not hazardous t o personnel.

Out le t Works and Spil lway

9. Inspect i on and maintenance. -- The Chief, Engineering Eva1 u a t i on and Maintenance Section o r h i s ass is tant s h a l l inspect per iod ica l l y the f u l l length o f the o u t l e t tunnel and sha l l complete an inspect ion check l i s t shown as Exh ib i t C. Any cracks i n the tunnel l i n i n g sha l l be reported i n r e l a t i o n t o the nearest s t a t i on marker. Damaged con-cre te o r r i p rap structures sha l l be reported and repaired. Broken concrete surfaces and exposed reinforcement s tee l sha l l be thoroughly cleaned by chipping o r sand sandblasting and sha l l be restored t o the o r i g i na l dimensions. Any i nd i ca t i on of settlement, u p l i f t , f a i l u r e o f concrete structure, o r sloughing o f the rock-cut slopes a t the por ta l o f the tunnel sha l l be immediately reported t o the Chief, Operations Branch. Channels sha l l be kept reasonably f ree o f d r i f t -wood, trash, s i l t , and other debris. Driftwood, brush, weeds, and other combustible t rash on the pro jec t , espec ia l ly around the entrance t o the in take structure, sha l l be removed from the in take structure.

Non-combusti b l e accumulatiqn sha l l be hauled away and dumped i n approved disposal areas.

Communi cat ions Faci 1 i t i e s

10. Radio f ac i 1 i t ies . -- A remote cont ro l t ransmi t t ing rad io u n i t i s provided i n the recorder house. The rad io u n i t i s a l i n k between the recorder house and the Reservoir Regulation Section t o in ter rogate the telemarks. The rad io u n i t i s ba t te ry powered and i s recharged by e l e c t r i c a l serv ice provided by Southern Ca l i fo rn ia Edi son.

11. Maintenance o f rad io f ac i 1 i t ies . -- The maintenance o f rad io f a c i 1 i t i e s , inc lud ing per iod ic inspection, t es t i ng and serv ic ing i s the responsi b i 1 i ty o f the Reservoi r Regulation Section, Operations Branch.

Hydrographic I n s t a l 1 a t i ons

12. General. -- Hydrographic i n s t a l 1 a t i ons include a reservoi r water surface recorder, gaging stat ions, telemark i n s t a l l a t i on , reservo i r s t a f f gages, p rec ip i t a t i on stat ions, sedimentation ranges, and pub l i c u t i l i t i e s . Information on the hydrographic f a c i l i t i e s i s given i n the f o l 1 owing paragraphs :

a. Reservoir water-surface recorder. -- A concrete block recorder house i s located on the l e f t abutment which i s provided t o house a bubble gage i n s t a l l a t i o n t o be used t o obtain the water leve l . The i n s t a l l a t i on consists o f a 120-inch mercury servomonometer, water-surface recorder, telemark, gas purge system w i t h storage tank, and three one-fourth-inch l i nes , one terminat ing a t the inver t , one about 60 f e e t above the i n v e r t and the t h i r d about 120 f e e t above the inver t . An automatic switching device i s a lso provided.

b. Gaging stat ions. -- Two out f low gaging s ta t ions are provided below the dam, each cons is t ing o f an instrument she1 t e r which house a 32" mercury servomonometer ,-water-level recorder, and a gas purge system w i t h storage tank and one-fourth-inch l i n e t o the sump a t .the i nve r t . One low f low gaging s ta t i on i s located a t the o u t l e t of the tunnel, the o ther about one mi le downstream o f the dam toe.

c. Telemark i n s t a l 1 at ion. -- A telemark, from which reservo i r water-surface elevations- can be obtained i s provided a t the dam and i s in ter rogated by rad io f rom the Reservoi r 'Regulation Section.

- - A - - -

d. Reservoir s t a f f /gages .-- The reservo i r s t a f f gage system, consists o f 38 f i ve - f oo t sections which are i n s t a l l e d along the -slope o f the dam adjacent t o the east abutment.

e. P rec ip i ta t ion s ta t ion . -- A long term recording p rec ip i t a t i on saqe i s i n s t a l l e d a t the recorder house located on the l e f t abutment o f - the dam. An e x i s t i n g weekly recording gage i n the West Fork drainage area i s located a t Summit.

f. Monumented sedimentation ranges. -- A ser ies .of s i x sedimen-t a t i o n ranges are establ ished i n the reservo i r area.

Foundation and Mater ia ls Instrumentation

13. Instrumentation provided a t Mojave River Dam.-- The instrumenta-t i o n a t Mojave River Dam consists o f two slope ind ica to rs located along the crest o f the dam 10 f ee t downstream from the axis;

20 sett lement monuments located a t the top o f the dam along the c res t o f the upstream and downstream slopes; fou r recording strong-motion accelerographs, two are located a t the toe and c res t o f the main embankment opposite s ta t i on 21+50, one on the c res t o f the saddle dike opposite s ta t i on 3+47 and another located approximately 150 f ee t east o f the r i g h t abutment o f the saddle dike. (See Exhib i ts D and E.)

A b r i e f descr ip t ion and the funct ion of each instrument i s presented i n the fo l low ing sub-paragraphs :

a. - The slope i ndi cators are prec is ion instruments used pr imar i l y f o r measuring hor izonta l movement o f the embankment. A speci a1 l y grooved aluminum casing i s i n s t a l l e d i n a bore hole which' extends below the ant ic ipated zones o f movement. The casing i s s u f f i c i e n t l y f l e x i b l e t o displace l a t e r a l l y as the embankment moves. The measure-ments are accomplished by lowering a special instrument, .consist ing o f a pendulum-actuated conventional Wheatstone Bridge c i r c u i t , down the grooved casing and tak ing i n c l i n a t i o n readings a t frequent in te rva ls .

The slope ind ica to r casings are i n s t a l l e d w i t h s l i p couplings a t f ive- foot i n t e r va l s from e levat ion 1170 t o the top o f the dam. The couplings provide a s ix - inch gap t o al low the casings t o ad just t o v e r t i c a l movements of the embankment. Measurement o f sett lement of the embankment are obtained by observing the changes i n the gap between casings.

b. The sett lement monuments provide data t o determine the t o t a l v e r t i c a l movement o f the embankment and the hor izonta l movement a t the c res t o f the dam. The measuring po in ts are protected by four-inch s tee l pipes and caps. Permanent reference po in ts f o r both v e r t i c a l and hor izonta l cont ro l are placed near each abutment.

c. The four recording strong-moti on accelerographs s t a r t operating automat ical lv a t the onset o f seismic a c t i v i t y . Each fnstrument i s equipped w i t h a d i g i t a l counter t h a t records each t ime the instrument i s tr iggered. When tr iggered, the accelerographs s t a r t a f i ve-second-minimum recording cycle t ha t causes a f i l i n g s t r i p t o be exposed as i t advances i n t o a take-up magazine.

14. Observation schedule.-- Slope ind ica to r measurements w i 11 be taken a t monthly i n t e r va l s f o r the f i r s t year. Thereafter, measurements w i 11 be taken twice each year. he- sett lement monuments w i 11 be surveyed a f t e r completion o f the dam and then once each year f o r f i ve years. Thereafter, the sett lement monuments vi 1 1 be surveyed every f i ve years. The accelerographs w i 11 be checked monthly by Corps o f Engineers personnel and ua r t e r l y by the Department o f Commerce, Seismological F i e l d Survey ? CSFS) personnel. Addi t ional readings o f a l l instruments w i l l be taken fo l lowing periods o f st rong seismic a c t i v i t y , a f t e r rap id changes i n water-surface elevat ions , a f t e r periods o f water impoundment t o a height greater than the ha l f -he ight o f the dam o r a t any time where detr imental movements may be suspected.

15. Responsi b i 1 i ty f o r instrumentation measurements .-- The Reservoir Regulation Section, Operations Branch i s responsible f o r reading the slope ind icators and slope instrumentation, A1 1 measurements taken by the Operations Branch personnel w i l l be t ransmit ted t o the Foundation and Mater ia ls Branch. The Survey Branch w i 11 perform a l l v e r t i c a l and hor izonta l movement surveys upon request by the Operations Branch.

16. Instrumentation data analysis and reports.-- A l l instrumentation data processing and analysis o f resu l ts , excepting seismic and survey data, w i 11 be performed by the Foundation and Mater ia ls Branch.

Seismic data analysis w i l l be performed by CSFS and survey data reduction w i l l be done by the Survey Branch. The data w i 11 be put i n repor t form and t ransmit ted t o Design Branch, Engineering Div is ion.

Coordination w i t h Other Agencies

17. Archeology. -- The National Park Service has two archeological sites a t the Mojave River Dam. One on Deep Creek designated a s 4- SBr-272 and one below the dam designated a s 4-SBr-176. Any excavation within these general a reas s h a l l be coordinated with t h e National Park Service. (See Exhibit F. )

I I I I

1 U. S. ARMY ENGINEER DISTRICT CORPS OF ENGINEERS I

1 1 '

I ws- -0-

W: J.JK I UOJAVE RIVER 8ASIN.CALIFORNIA I

~ r r m W. scw MOJAVE RIVER FORKS RESERVOIR

DAM AND APPURTENANCES

GENERAL PLAN --- EMBANKMENT,SADDLE DIKE AND I - =- - APPURTENANCES I

m- cu .UCIL a a' SPECIFICATIONS AS SHOWN OACVO9 68-8-0012 3 7 - -- on. rm. nu *)

OCTOBER. 1967

m

3411145 'A'

OF

I SHEET2 OF 2 EXHIBIT A

DRAkIING HALF-SIZE

(Unattached)

EXHIBIT B

I INSPECTED BY PROJSCT I

CONDITION SURVEY OF DAMS

(Complete i n duplicate)

DATE

I I I

After each item indicate one of the following:

(If Unsatisfactory, circle deficiency and explaln ( M A ) Not Applicable; ( s ) Satisfactory; ( J ) Unsaiisfactory on reverse side giviN Item Number)

ITEMS T O B E INSPECTED AND DEFICIENCIES T O LOOK FOR

1. BASIN - dumping, floatable debris, dead brush, trees or logs, trespassing

2. ACCESS ROADS - rough, need blading, weed clearing, surfacing, slides, settlement, ruts, washouts, p! obstructions, damaged guard posts, barricades, lights, signs, eroded or plugged culverts

111 5. SLOPES - erosion, loss of filter, cracks in grouted stone, wet areas or seepage in downstream slope, burrowing animals, weeds or brush

- - - I 1 9. CONCRETE - width and extent of cracks, papouts, expansion ioints, alinement of joints, subdrains 1 I

+I 10. GATE OPERATING CHAMBER - lights, waterlines and valves, electric conduits, oi'l pressure lines, gate

6. TOE DRAIN - seepage, drainage, relief wells, drainage ditches, plugging, si l t ing of toe extension

7. GALLERY - concrete, seepage through iolnts, settlement, steelwork, rust, paint, padlocks

8. APPROACH CHANNEL - slouahed or eroded banks. drainaqe ditches. deposit of sediment. weeds. brush

* 11. DRAINAGE GALLERY (Hansen Dom) - malfunctioning of foundation drain holes, floor drains, drain outlet, 1 21 drain manhole I I

3. CHANNEL IN BASIN - concrete, grouted stone side slopes, stabilizers, rock toe, levee erosion, toe drains, subdrainage, manholes, side drains, gaging station

4. CREST - erosion, bituminous surfacing, slope to drain toward upstream facing, weeds, brush

12. BUCKET OR STILLING BASIN - accumulation of trash and debris, degradation of downstream channel, subdrains, weepholes, pools of stagnant water

13. APPROACH CHANNEL - potential slides, sloughed areas, accumulation of trash and debris, rubbish, weeds, stone blanket, disintegration of rock, weepholes

I

1 31 14. INTAKE - crocks in concrete, spalled joints, seepage ;hru ioints, displacement due to settlement, I I

1 1 float recorder intake, missing wire screens, clogging of inlet, rusty ladder rungs, mud, sand or s i l t i n I I

L( hi 16. CONDUIT - trash and debris. concrete ~ o ~ o u t s . see~aae thru ioints. concrete abrasion areas I I k float well, trash racks, vent pipes, diversion structure I IS. CONCRETE - width, extent of cracks, popouts, olinement of ioints, expansion ioints, subdrainage ' I

1 19. SERVICE BRIDGE - alinement, pier settlement, expansion joints, handrails, curbs, concrete, lights, paint 1 1

-7

O 17. BUCKET OR STILLING BASIN - accumulation of trash and sediment, concrete, stagnant water, subdrainage

18. OUTLET CHANNEL - change in grade or alinement, obstructions. subdrmincrge, erosion, gral~+ed stone .-

18) 21. HOISTING EQUIPMENT - hoist cables, function of chains and sprockets, vibration of gear boxes, drive 1 1 I ' shafts, lubrication, gate stem, excessive wear, corrosion, rust, paint

8 22. HYDRAULIC SYSTEM - piping leaks, control system, pumps 8 motors, lubrication, sparking, excessive heat

20. GATES - corrosion, distortion of leaves, olates or frames, gate creep, missing bolts or nuts, o i l leakage, tightness of seals, clean sealing surfaces, lubrication, paint

3 23. ELECTRICAL EQUIPMENT - motors, heaters, gate position indicators, panels, loose wires, insulation, 1 "1 switchbwrd, defective parts, burnt fuses, broken switches, sparking, overheating, cleanliness I 1 J

I g1 29. STAFF GAGES -damage, displacement, legibility, concrete footing, paint 1 I

0 "

U

I

30. VANDALISM - report evidence I I

24. HYDROMETRIC EQUIPMENT - correlate settings, automotic recordings, clocks, tape, ink in pens, charts

25. TELEPHONE-RADIO - defects in radio or telephone communication system, volume, audible howlers

26. FLOOD LIGHTS - condition, check lamps, conductor cable and terminal plug

27. ELEVATOR - malfunctioning, start, run and stop, brakes, paint, lubrication, cleanliness

28. FENCING - damaged fobric, wires, posts, cables, chains, gates, missing fencing accessories, alinement, paint

373 PREVIOUS EDITIONS ARE OBSOLETE SPL 63

EXHIBIT C

DATE

REPAIR

COMPLETED

Engineering Div., ITEM

NO.

One and

DESCRIPTION OF DEFICIENCY AND RECOMMENDED REPAIRS

checklist t o be submitted to the Chief, Maintenance Section, who will route it to the Design Oranch, one checklist to he submitted to the Chief, Operations Granch, Construction Div.

SECTION AT BOLTS

LEGEND

+ set MonCi SETTLEMENT MONUMENT.

S. I .*I SLOPE INOICATOR.

ACCELEROQRAPH MANHOLE

APPROXIMATE €&~eTtNb MOJAVE RIVER FORKS RESERVOIR DAM AND APPURTENANCES I. 5 i x r e f i r e n e mnwmanf* o m row of fb ree curb, shuN be imfu//ed abufmnf

EMBANKMENT

Locotiom A// be d+rrn!nsd bq Confruc ling Officer.

Monuments dm// be ,nsto/hd offer occcm r o d and p u r k ~ h y w e 0 5 rar comp/eted.

2. /nstoll /'Conduit wi t0 3 * I 6 Conductors Isnieldsd) 3 feet of,' edge o f povemmt, I l incher deep, from pnN box near

SECTION I - A recorder house t o u.cce/eroqropb monhole i n sodd/e dt k e .

U.S. ARMY ENGINEER DISTRICT CORPS OF ENGINEERS 1;