In Rtply Rtftr To: RP-2-1 • JUN 221984

Chevron U.S.A. Inc. Attention: Nr. C. W. McCants «>Ott OffUt Box 23709 Harahan, Louisiana 70143

Gootltmtn:

Reference Is otdt to your Init ial Devel o©«*nt Operationt Coordination Docuemnt (DOCD) and Enviiunti i t t l Rtport recti ved June 18, 19*4, for Lt t t t OCS-G 6766, Block 51, South TlmbtHer Area. This DOCD Includes tht aropottd activit ies for Wells A through F tnd tht CF platfom.

In accordance with 30 CFR 250.34, revised December 13, 1979, tod Notice tt Lt t t t t t tnd Operators No. 64-1, tMs DWD hat bttn determined to bt complete t t of June 22, 1964, and 1s now btlng i nsldered for aporoval.

Your control numbor 1t N-1715 and should be referenced In your ctmmmlcation •md correspondence concerning this DOCO.

Sincerely yours,

(Orifl. Sgd.) D.W. S o l a n *

0. M. Solents Regional Suptrvlsor Rules and Productir*

bcc: Lease OCS-G 6766 (OPS-2-3) (FILE ROOM) li£Sj£-5 w/Publlc Info. Copy of tho DOCD tod ER (PUdLIC RECORDS ROOM) DO-6

AGobert:gtj:6/19/34 Disk 3a

Office of Program Services

JUN 25 1964

Recoros Management .Sectjon

E X H I B I T A S O . T I M B A L I E R B L K . 5 1

o o

COASTAL ZONE MANAGEMENT

CONSISTENCY CERTIFICATION

jf£. . . £ Development Operations Coordination Docuaent

Typ* oi Plan""

^ \ e a s e Number(sT

Tho proposed •ctivities described In detail in thia plan comply with Louisiana's

approved Coastal Management Program(s) and will bo conducted in a manner

consistent with such Program(s).

Chevron USA, Inc. Lessee or Operator

Certifying Off icial

- June 15. 199* Date

- 2 -

DEADLIME

Complec« Pipelines and Put Hall "A" on Production >r 1984

Conp l o f Fabrication of begin installation.

"C" Production Structura and June 1985

Conplete Drilling of 6 Holla July 1985

Complete InataHatlon of "C" Production Structure and put Walla H B M - "T" on Production September 1985

Uo plan to utilize a d r i l l barge similar to tho Glomar "High Island IV** to d r i l l thaaa walla. Tho d r i l l i n g barge v i l l provide wall control and contain­ment pollution control, f i r e fighting and U f a saving equipment, and a sewage treatment system to comply vith MMS and U. S. Coaat Guard requirementa. a eketch of the type of d r i l l i n g barge to ba uaad l s attachad.

Tho onshore support and storage fac i l i t iea raquirad for tha propoaad plan aro Chevron USA, I n c . ' a axiating fac i l i t i ea located at Leevil le , La . Tha axiating base has adequate fac i l i t i ea for marine and a ir transportation to handle tha equipment for this additional developawnt location.

Chovron USA, Inc. 's O i l S p i l l Contingency Manual haa previously been f l lad vith Lha MM which providea tha specific details to bo employed for preventing, re­porting snd combating incidents of pollution. Chevron USA, Inc. ia a member of tho Claan Gulf Associates which maintains high volume cleanup equipment at i t s bono tt Leeville, L a . Tho response time for i t s development to tha location i n approximately 6 hours.

I n accordance vith 30 CFR-250 34-2, va enclose cha following documents:

Location Plat Vicinity Map Dri l l Barge Specif ications - High Island IX Consistency Certif icat ion Wall Caiaaon Structure fc Navigation Aids Tower Air Emissions Import Environmental Report Drilling Mud Additives

Chovron USA, Inc. bellovea that tha geological structura nap and tha schematic croee-section asp submitted are exempt fron disclosure under tha Freedom of I n ­formation Act snd should, therefore, not ba nade available to tha public or provided to any affected atate or to tha exacutiva of any local government.

Vo plan to commence operationa August 25, 1984. Tlma to coaplata OCS-G-6766 M A M , the f irs t v e i l to bo dr i l led , is ±37 d.iys.

I f any further information IS required, plaaaa contact Ma. Sandy Bergeron at 504-734-4174.

Yours vary truly.

PUBUC INFORMATIO

Chtvron U SA Inc P.O. Boi 23709 Harahan. LA 70183-0709

DEVELOPMENT OPERATIONS COORDINATION DOCUMENT I SOUTH TIMBALIER BLOCK if K

OC8-C-6766 '

U. S. Dept. of tho Interior mnxu MANAGEMENT uttvxx. Minerals Managenent Service P. 0 . Sox 7944 m i 3 p j g

i I r i s , U . 70010-7944

Gentleman: M B

Chevron USA, Inc . . aa tha operator* submits this proposed Developnent Opera­tiona Coordination Document for South Timbalier Block 31, OCS-C-6766:

Propoaed Plan of Development

Va plan to Initiate our activity in OCS-G-6766 by dr i l l ing a straight hole a ingle veil calaaon ("A"). Upon conpleting this v a i l , va v i l l than begin d r i l l i n g s total of f ive (5) directional v a i l s ("B" - "F") adjacent to thia same surface location. A 6-alot, 4-pile structura ("CF" Platforn) i a sche­duled to ba moved onto tha location in November, 1984. The directional vai ls w i l l ba put on production once suitable f a c i l i t i e s ("C" Structura) ara i n ­stal led in Septi abir, 1985.

Location of Propoaad Walla

WILLS "A" - "T" - Surface Locationi 2700' FEL and 2808' FHL of South Tlnba­l l e r Block 51

"CP" Platform - Surface Locationi 2700' PSL and 2808* FNL of South Timba­l i e r Slock 51, also being positioned st location of Wells "A" - " f

Tha water depth of tha propoaad vai ls l s 55'.

ACTIVITY SCHEDULE

PKAPT™!

Begin Fabrication of "CF" Dril l ing Structure (6-wall Platforn) and begin d r i l l i n g val la "A" - "F" (±37 daya/ wall) August 1984

Begin Fsbrlcstion of •*CW Production Structure, Begin Pipelines, Complete Pabr icat ion and' InataHatlon of "CF" Platfora November 1984

PUBUC iNFORMATION Eastern Region. Exploration. Land & Production

8URFACE LOCATION OC8-6766 ¥>A-#F o

00 CM

4 2700' FEL

t v V

f CNt«

I , H f t l .

•CM HiMt -Of* • 4,19

-<»•<

i \ 0( 8-8766 *A-+F

V CHEVRON U.S.A., INC.

8. TIMBALIER BLK. S I

SURFACE LOCATION

4000 — l

SCAiC * H I T

SCHEDULE C

Equipment and Services Furni.-.hed

GLOMAR HZGH ISLANO ZX

Category;

1 Furnished by Contrac paid by Contractor. Furnished by Contrac paid by Operator* p l handlin v charge. Purnishad by Contrac paid by Operator, no handling charge. Furnished by Operato paid by Operator.

2

3

4

1. DRILLING UNIT DESCRIPTIOH AND SPECIFICATIONS:

The se l f -e levat ing d r i l l i n g uni t , GLOMAR HIGH ISLAMD IX, v i l l ba as described in Appendix I attachad hereto and aade a part of this Schedule C.

DRILLING UNIT MOORING SYSTEM:

a. Two (2) point anchor system.

b. Moorings: Two (2) 2,100' x 1-1/2", € x l t IPS, IWRC wire l ines with ABS c e r t i f i c a t e s .

c. Two (2) 10,000 l b . anchors.

d. Mooring Winches: Two (2) Marathon LaTournaau Ser i e s W-1500 TS s ingla drum winches each driven by an a l a c t r i c motor.

e. Marker buoys on locat ion.

f. Two (2) anchor buoys.

g. Pendant wires, shackles and associated jewelry and wire l ine for crown U n a s .

h. Workboat mooring l i n a (replacement l ine furnished by Operator). .

PRILLING EQUIT̂ MJDfTt

a. Drawworks: National 1320 OX drawworks f i t t a d with Elmagco 7838 a l a c t r i c brake, powarad by two;2) GZ 752 tar i a s a l a c t r i c motors.

b. D r i l l L ine : 1-1/2" - 6 x 19 IPS IWRC x 7,500'.

c. Wira L i n a Anchor: National Typa SB.

d. Sandline: 9/16" - € X 7 - 20,000*.

a. Derrick: Standard 147' high, 30 x 30' basa with 1,000,000 lbs . s t a t i c hook load capacity.

f . Nod Pumps: Two (2) National 12-P-160, tr ip lax pumps, 1,600 t o t a l continuous horsepower each, powarad by two (2) GE 752 Series a l a c t r i c motors, with two (2) aach 8 x (X centrifugal charging pumps drivan by 100-hp a l a c t r i c motors.

g. Rotary Tablat National C-375 rotary tabla inde­pendently drivan by GE 752 Sarias a l a c t r i c motor with National two-speed transmission.

h. Crown Block: National Typa 760FA with 513 tons rated capacity with 60" shaavas.

i . Traval ing Block and Book: National Universal hook block with 500 ton capacity .

j . Swivel : National P-650 with €50 ton capacity.

k. Rotary Boss: Two (2) 3-1/2" x 80' , 5,000 psi VIP with 4" mala thread coupling.

1. weight Indicator.

x. Joy hydraulic powarad d r i l l pipa tong.

n. R a l l y : Two (2) 5-1/4" haxagonal x 42' long x 3-1/4" ZD k e l l y s .

o. Ra l ly Spinrer.

p. Wireline measuring assembly with 25,000' of .012" s t a a l l i n a .

DRILL STRING:

a. Drill Pipa i

(1) 5,000', 5" OD Grada G 19.5 lb./ft. Range 2 d r i l l pipa with 5" XH x 6-3/8- OD tool joints.

(2) 10,000*, 5" OD Grada X 15.5 lb./ft. Range 2 d r i l l pipe with 5" XH x 6-3/1" OD tool- joints.

b. Drill Collars:

(1) Twelve (12) I " OD x 2-13/16" ID x 31J long with 6-5/8" API Hag. connections, grooved for "sip" handling.

(2) .Twelve.. (12) 6-1/2" OD x 2-13/16" ID x 30' long with 4" IP tool joints grooved for "sip" handling.

c. Subst Sufficient for Contractor-furnished d r i l l pipe, d r i l l collars, and d r i l l tools including kellys.

o. Stabilizers: As required.

a.' Saver Subs for Contractor's 5-1/4" kelly

f• Drill Pipa Wipers.

g. Bit Breaker-: 26" and smaller; one set each.

BLOWOUT PRXVENTXHSt

a. Diverter System: Hyaril Type MSP-2000, 21-1/4" annular usad with drilling spool between weilheaa and Hydril. Spool has two 12" outlets for port and starboard diverter lines.

b. 13-5/8", 10,000 psi WP Blowout Preventer System consisting of the following: ,

(1) Ona (1) double preventer with four flanged outlets fitted with one set of :>ipe rams for 5" d r i l l p'?e and one sat of blind "rams.

(2) Ona (1) double preventer with four flanged outlets fitted with two sets of pipe rams for 5" d r i l l pi->e.

(3) Ona (1) 13-5/8" - 5,000 psi WP annular blowout

(

preventer.

(4) Blowout preventers are trimmed for H2S sorv ice .

(5) A 50-ton blowout preventer handling system, including air-powered hoists and t r o l l i e s .

c . BOP Choke and K i l l L ina System:

(1) Two (2) 3-1/16", 10,000 ps i WP hydraulic f a i l s a f e valves .

(2) Two (2) 3-1/16", 10,000 psi WP manual valves.

d. Blowout Preventer Control System:

(1) 180-gallon accumulator capacity.

(2) 360-gallon f l u i d reservoir .

(3) One (1) 20-hp, 3,000 p s i , 8 gpm e l e c t r i c t r i p l e x pump.

(4) One (1) air-powered pump, capacity 3.5 gpm at 3,000 p s i .

(5) Manifolding valves and regulators for functioning following:

(a) Hydri l . (b) Four (4) ram type BOP's. (c) Two (2) bydraulically-oparated choke and

k i l l valves . (d) Two (2) manually-operated choice end k i l l

valves. (e) One (1) spare. (f) Diverter control system.

(6) Master control panel on d r i l l floor.

(7) Raaottt control panel in toolpusher;s office.

e. Choke Manifold: 3-1/16", 10,000 psl WP suitable for H2S service wi.h:

(1) Two (2) 3" automatic 10,000 psi WP chokes with remote control panel.

(2) One (1) 3" manual adjustable choke. ,

f

(3) . ' u l l opening by-pass l ino - 3".

f. Tools snd equipment ss required for Operator's woll control procedures above Contractor's obligation.

g. Replacement parts for rubber coaponents of BO? sys tea

h. Casing aad tubing rams.

DOWNHOLE TOOLS AHD EGaiPMEtlTt

a. Casing Protectors: D r i l l pipa rubbers for 5" OD d r i l l pipa.

b. Cora barre l s .

c . Cora he i , core catchers , snd coring service charges.

d. Swsbbing or bail ing equipment except sand reel and sand l i n e .

e. D r i l l i n g b i t s , under-reamers, hole openers, wall scrapers , etc .

f . Control Valves:

(1) Two (2) €-5/8" Regular, l e f t hand thread, upper ke l ly cock*, 10,000 pel WP.

(2) Two (2) 4-1/2" ZF, lower kel ly valves, 10,000 ps i WP.

(3) Two (2) eech inside blowout preventers for 5" d r i l l pipe, 10,000 psi WP.

g. D r i l l stea testing tools and equlpaent.

h. F l o a t valve: Baker Model G fu l l - f l ow for Con­t r a c t o r ' s d r i l l s t r i n g .

FISHING TOOLS:

F i sh ing tools for Contrector-furnirhed equipaent.

PRILL STRING HANDLING TOOLS:

a . S l i p s , D r i l l Pipe: Varco Type SDXL-5".

b. Slips, D r i l l Collar:

(IJ Varco Typa DCS-L: 6-3/4" - 8-1/4".

(2) Varco Typa DCS-R: 5-1/2" - 7".

C. Elevators, D r i l l Pipa: 350 ton - 5".

d. Links, EJevatorss BJ 3-1/2" x 144" - 500 ton 7

a. Elevator, Zip L i f t : BJ Type SLX-150. Side door for •" and 6-1/2" d r i l l '.oilers.

f. Tongs, D r i l l Pipa: BJ Typa "DB" Range 3-1/2" -6—1/4 — •

g. Safety Clamps:

(1) Vsrco Typa MP-R Range 5-1/2" - 7".

(2) Varco Typa MP-R Range 6-3/4" - 8-1/4".

h. Air Tuggers: Four (4) air tuggers.

f. UTILITIES:

a. Fuel storage aboard drilling unit.

b. Greases snd lubricants for Contractor's drilling equipment aboard the drilling unit.

c. Tool joint lubricants for d r i l l pipa, d r i l l collars, and other connectors.

d. Thread compounds for Operator's connectors end casing.

a. Presh drilling water and potable vater in excess of distillation units.

f. Diesel fuel including that used in the mud system, to power drilling unit and used by work boots.

10. MOD FACILITIES AND EQUIPMENT:

s. Liquid Mud Storage Tanks: Three (3) eech 400 bbls. tanks plus a 40 bbl. trip tank, and 200 bbls. ssnd trap.

b. Mud Flow Pipe: Bell nipple joint to shale shaker.

s

e. Shale Shakers: Brandt dua l tandem scraan typa separator mounted on sand t r ap (Replacement scraans to ba provided by Oparator)•

d. Desander unit charged by 8 x 6R centrifugal pump drivan by 100-hp explosion-proof a l a c t r i c motor..

a. Mud Cleaner: Brandt dual, tandem cleaner including two (2) 3 hp 1,800 rpm explosion-proof motors (Replace­ment scraans to ba provided by Oparator) •

f . Hud A g i t a t o r s :

(1) Ona (1) 3-hp explosion-proof a l a c t r i c mud mixer mounted on slug?ing p i t .

(2) Three (3) 20-hp explosion-proof e l e c t r i c mud mixers mounted on main mud tanks.

(3) Four (4) 2-hp explosion-proof e l e c t r i c aud mixers mounted on sand trap p i t s .

g. Mud-Gas Separator.

h. Degassert Wellco Mooel 6200, charged by 8 x 6R c e n t r i f u g a l pump driven by 100-hp explosion-proof e l e c t r i c motor.

i . Mud Test ing F a c i l i t i e s : Basic k i t for v iscos i ty , f i l t r a t i o n , weight, and t i t r a t i o n .

j . Mud Mixing Pumps: Two (2) Mission 8 x SX centrifugal pumps driven by 100-hp e l e c t r i c motor.

k. Water base aud and chemicals.

1. O i l base-muds, o i l emulsion and other speeiel d r i l ­l ing and coapletion f l u i d s .

a. O i l for completing wel l s .

n. P i t l e v e l ind ics tor on ac t ive tank w i t h . t o t a l i z e r at d r i l l i n g p o s i t i o n .

o. Manifolding to cement surge tank to permit mixing b s r i t e plug at cementing unit .

p. Gas Detection System: Fixed combustible five-point monitor gae detection system complete with control modules, general alarms and sensors s trategical ly

( . . ^ — :

v • !

located on tho rig..

11. CASING AND RELATED TOOLS;

a. Cosing, tubular goods, casing and tubing hangars, packers and bridga plugs.

b. Casing shoes, flanges, cementing baskets,centralizers, fl o a t c o l l a r s , scratchars.

c. Wellheads, including casing snd tubing haads, spacer spools, wear bushings, including ring gaskets and Othor items balow Contractor-furnished BOP.

d. Valves, Christmas trees, and a l l materials and services raquirad for permanent installation that w i l l remain as part of a wall.

a. Diasal hammer for conductor pipe.

f. A l l conductor pipa.

12. SPECIAL SERVICES AND EQUIPMENT:

a. Cementing Unit: Twin Halliburton HT-400 skid-mounted cementing unit with two (2) diesal anginas. Rental fees, i f any, to ba paid by Operator.

b. Ceaent and cementing services.

e. E l e c t r i c logging unit, logs, dipaeter, and related tools and services.

v

d. Casing and shoe testers.

e. Cun perforating and releted services.

f. Mud logging unit and related services. g. whipstocks and a l l other deflection tools, equipment

and services. -

h. A l l surfsce. and down-hole survey equipment end services.

i . Formation testing tools tnd services.

j . Test tanks and accessories for production testing.

Well Testing Burner Equipment:

(1) Port end starboard burner boom for well testing.

(2) Manifolding snd piping as required to end of boom for o i l , gss, wster, snd s i r .

(3) Test separators and burners.

All permanent or special installations and special services including services for controlling blowouts and f i r e s .

Diving services and equipment at Operator's request.

Supply boat ( s ) , anchor handling boat(s), work boats, and craw boat(s).

Tug boats as required.

Helicopter transportation.

Totco Drift Indicator, 0-1 degrees and 0-16 degrees for Contractor-furnished equipment.

Radios:

(1) Radios presently aboard the drilling unit as listed in Appendix I . Further requirements shsll ba furnished by Operator.

(2) Onshore rsdio operating personnel to maintain communication between drilling vessel and a land station as requested by Operator.

(3) Installation of VHF and SSB radio at shorebase, including cost of s i l crystals for Operator's desired frequencies.

Spare parts and operating supplies for Operator's tools and equipment.

Spare parts and operating supplies for Contractor's tools and equipment.

Welding and Cutting:

(1) Welding and cutting for rigging up on well location, for welding drive pipe, conductor

pip* or other major equipnent ee requested by Operstor in excess of one welder supplied by Contrsctor, snd in excess of two welding sui chinos.

(2) E lec tr i c end oxyscetelyene welding supplies.

v. Lodging snd metis sbosrd the drilling vessel for Operator-designated personnel:

(1) Lodging (including linen end lsundry service) d meals (catering service snd supplies) for

two (2) persons designated by Operstor.

(2) Cost of looging (to the extent f s c i l i t i e s available)and meals for Operator-designated personnel in excess of the number specified in (1) above, s t sgreed f i s t rete of $18.00 per.person for daily lodging en) meels or $8.00 per person for eech essusl meal (To be reviewed snd revised annually to reflect changes in cost)•

w. Additional labor specifically requested by Operator in excess of Scnedule B complement.

x. Work (overtime pey for Contreetor's personnel eligible for such psy) in excess of normal work schedule as specif ical ly requested by Operator.

y. Costs incident to shutdown or evscustion for storms snd hurricanes.

s. Stevedoring equipment and personnel for loading end unloading Contractor's, Operator's, and Third Party equipment, materials, and supplies at the port of mobilization, shorebaae, and other ports es required for the work hereunder.

13. MISCELLANEOUSt

a. Drilling permits end other clearances required by government to d r i l l offshore in Country of Operation.

b. Corporate registrstion fee of Contrector in the Country of Operation for the performance of this Agr*-er»nt.

c. Passports, visas, and processing of Contractor's personnel, including transportation to Country,of

V

Operation.

Port, harbor, pilotage, tug and similar fees aad charges within the Area of Operation and related to movement, loading, or unloading of equipment furnished hereunder, to the extent Contractor is obligated to snd does pay.

Customs duties ana bonas, work permits, fees, taxes, licenses, clearances, import t a r i f f s or similar charges, including brokerage fees i n connection therewith, imposed by the Country of Oper etion on equipment, supplies, snd personnel employed in the oparations hereunder and which Contractor is obligated to pay aad does pay.

Shorobeset

(1) Shorebese and port f a c i l i t i e s for Country of Operetion.

(2) Shorebase open end covered storage for Con­tractor ' s equipment, materials, and supplies.

(3) Shorebase open and covered storege warehouse for Operator's equipment, materials, and supplies.

(4) Contractor's o f f i c e f a c i l i t i e s .

Transportation for Contractor's personnel, materials, and aupplies except ss provided for belowi

(1) Transportation for Contractor's personnel be­tween Contrector's Operating Bese and the dri l l ing vessel .

(2) Transportation for contract equipment between Contrector's Operating Base and the d r i l l i n g vessel .

(3) Transport of d r i l l i n g and potable water.

Land transportation for Operator's materials snd suppl ies .

Trave l time for l o c s l personnel in excess of two hours each one-way t r i p between shorebase and d r i l l i n v e s s e l .

Additional safety equipment, incluoing protective

clothing, i a excess of such equlpaent normally used by offshore d r i l l i n g crews, required when working wi th , or exposed to , o i l bese suds or other erosive chemicals end gases whieh may be harmful to Operator ex Contractor's personnel.

Cost of services, equipment, snd labor to prepare the drilling unit sad/or any Contractor-furnished eguipment to be compatible with Oper ator-furnished equipment including platforms.

. APPENDIX I

DESCRIPTION

A . GENERAL:

1. Type: Self-Elevating Drilling Unit

2. Class i f ica tion: ABS Maltese Cross AZ

3. Country of Registry: U.S.A.

B. DRILLING CAPABILITIES:

1. Maxiaum Drilling Depth (Rated): 20,000 feet.

2. Environmental Criteria (vith 360 feet of leg installed):

Maximum Wind Maximum Wave Maximum Incluoing Trough To Assumed Assume

Watar Dept** Gusts Crests Air Geo Penetr;

2S0 ft. 115 mph 38 f t . 12 sec. 30 ft. 25 ftj 200 ft. 115 mph 42 f t . 12 sec. 30 f t . 25 ft 150 ft. 115 mph 46 f t . 12 sec. 35 ft. 25 ft 100 ft. 104 mph 47 f t . 12 sec. 35 f t . 25 ft

NOTE: Any increase in penetretion will result in correspond decrease in wster depth -- any decrease in penetretion does increase the water depth.

3. Minimum Weter Depth: 15 f t . Shallower locations possibi under certain conditions. A l l drilling locstions are subject to Insurance Surveyor's approval.

4. Maximum Water Depth (Non-Hurricane Season): 250 ft.

5. Minimum Design Air Temperature: -10°C.

C. CANTILEVER CAPABILITY:

Cantilever can ba skidd .a 40 f t . from the stern of the jack the centerline of the rotary, and the d r i l l floor can be maneuvered 10 f t . each side of center. Has capability to d out a pattern within a 20 f t . x 35 ft. live drilling area a the hull.

i

0. PRINCIPAL DIMENSIONS:

1. Length O v e r a l l t

2 . B r e a d t h :

3. Dapth of Built

4. Distance between centers of two a f t lagst

5. Distance between center of bow lag- and centerline of aft legs:

6. Diameter of Spud Csnt (Across the f i s t s )

?. Height of Spud Cant

•• Total Length of each leg:

E. LOADING AND TOW_NO DATA:

1. Average Towing Spwedt

2. Displacement a : the Loadlinex (11 f t . of droit on the hull)

3. Minimum Drsft:

4. Maximum Leg Length for location tows:

5. Maximum Leg Length for ocean tows:

6. Maximum variable d r i l l i n g load: (excluding SOO S. Ton hookload)

Variable loed i s the weight of supplies thst ere expendable, readily removable, or consumed during d r i l l i n g operetions.

207 f t .

176 f t .

20 $t.

120 f t .

121 f t . • in.

40 f t . • i n .

21 f t .

360 f t .

4.0 knots wi hp Ocean Gcin

7,155 S. Tons

10 f t .

360 J t .

294 f t . (app'd

1,700 S. Tom (estimated,• subject to c) upon complet: d r i l l i n g uni-

Variable load consists ol such items:

a) L iquid Mud. b) Bulk Mud . C) Bulk Cement d) Chemicals a) O iasa l Fuel f ) Potable Watar g) D r i l l Watar

7 . Preload Capacity:

STORAGE CAPACITY:

1. D r i l l Watar:

2. Potabla Watar:

3. Fual Oil:

4. Bulk Cement:

5. Bulk Mud:

6. Liquid Mud:

7. Sand Trap:

8. Tubular Storaga Araa: (approximata)

9. Sack Storaga:

h) Lube Oil 1} Casing j) D r i l l Pipa k) Drill Collars 1} Supplies • m) Sack Materials n) .Spars Parts

4,360 S. Tons (approx.)

6,650 bbls.

980 bbls.

2,250 bbls.

3,400 cu. f t .

5,100 cu. f t .

1,200 bbls.

200 bbls.

4,300 sq. f t .

1,100 sq. f t .

MOTE: Any combination of tha abova cannot axcaad tha maximum allowabia variable load .

JACKING DATA:

1. Marathon LaTournaau Rack and Pinion Typa Jacking System drivan by 600 volt AC a l a c t r i c motors.

2. Approximata Jacking Speed:

3. Marethon LeTourneau Out-of-Level Warning Devices are provided.

4. Maximum Jacking Load:

5. A l l jack ing operations and conditions are subject to Insurance Surveyor's approvsi.

1-1/2 fpm

5,4 00 s. Tons

H. SUBSTRUCTURE:

1. Marathon LaTournaau typa with transverse skidding of d r i l l floor and longitudinal skidding of substructure, driven by AC e l e c t r i c Motors.

2 . lotary Load (maximum) : 375 S. Tons

3 . Setback Load (maximum): 225 S. Tons

4. Substructure i s designad for the combined rotary and satback loads not to exceed t 500 S. Tons

5. Csnter of rotsry can ba positioned s maximum of 10 faet either side of hul l c e n t e r l i n e , end e maximum of 40 feet a f t of the h u l l .

X. HELIPORT:

1. 65 feet in diameter. Designed to support an S-61 helicopter in accordance with Sikorsky specifications.

2. Perimeter lighting system with slternsting blue ana ember lights.

4. Pire station with hose and nozzle.

J . LIVING QUARTERS:

1. Air conditioned quarters for 64 persons, including six (6) hospital berths.

2. Single galley and double mess rooms.

K. METEOROLOGICAL INSTRUMENTS:

1. Anemometer.

2. Barometer.

3. Thermometer•

L . COMMUNICATIONS EQUIPMENT:

1. Single s ide band radio (Marine Frequencies, 2-24 MHz).

2. VHF-FM Transceiver (Marine Frequencies, 156 MHz Band).

V -N i

3. G a i t r o n i c s paging/telephone system.

M. POWER GENERATING EQUIPMENT:

1. D i e s e l E n g i n e s : Tour (4) C a t e r p i l l a r D-399 TA.

2 . Generators : Four (4) 80C kw, 603 v o l t AC.

3 . DC Power: R o s s - H i l l SCR system with c o n t r o l s for seven DC d r i l l i n o motors (plus c o n t r o l s for e l e c t r i c cement pumps).

4 . AC D i s t r i b u t i o n : Two (2) 1,000 KVA 600V/480V transformers . 480V motor c o n t r o l center and d i s t r i b u t i o n pane l s .

5. Emergency Power: One C a t e r p i l l a r D-379 400-kw generetor.

N. AIR COMPRESSORS:

1. Three (3) 300 CFM, 125 p s i s i r compressors v i t h a f t e r coo l er s and a i r a r y e r .

2 . One (1) 650 CFM, 40 p s i a i r compressor f o r bulk handl ing.

O . WATER DISTILLATION ONIT:

r e i l e y Beard wsste h e » t u n i t s - 2 eech 7, "00 gpd.

P . SERVICE PUMPS :

Two (2) eacn f o r f u e l , d r i l l weter , f i r e , b i l g e , potable water, and s a n i t s r y w s t a r . Three (3) raw wtter pumps.

Q. r i R E - r i C H T I N G AND SAFETY EQUIPMENT:

1. Carbon d i o x i d e system i n engine room, p a i n t locker , and mud p i t room.

2 . S a l t watar hose system.

3. P o r t s b l e dry chemical f i r e e x t i n g u i s h e r s .

4. P o r t s b l e CO2 f i r e e x t i n g u i s h e r s .

5. Ad-quate f i r s t a id f a c i l i t i e s .

R. LIFESAVING EQUIPMENT:

1. L i f e R a f t * : S u f f i c i e n t U . S . C . G . approved i n f l a t a b l e l i f e r a f t s to accommodate a l l personnel on board.

v ;> . v.

2. L i f t Ctptult t t Two (2) 50-man O.S .C.G. tpprovtd Whittaker l i fesaving capsules.

3. L i f t Jackets: Suff ic ient to furnish t i l personnel with ont (1) each plus sxetss ss required by O.S .C.G.

S . MEDICAL FACILITIESt

1. F i r s t Aid supplies snd equipment.

2. Hospital with s ix (6) berths.

T . CHANESt

Three (3) Marathon LaTournaau Sar ias PCM-120 cranes with 100 f t . boons ratad at SO S. tons s t 24 f t . radius.

0. WELDING MACHINES!

Three (3) 400-amp Lincoln electrically driven.

V. LIGHTING, WIRING, AND CONTROLSl

Vapor-proof or explosion-proof, es required.

W. SEWAGE TREATMENT PLANTx

Omnipure, 120-man unit .

DAVI tES CHANTIERS DAVIE LIMITEE DAVIF SHIPBUILDING vllTED

PAGE NO. 2

DAVIE HULL NO. 709 BOOKLET OF OPERATING CONDITIONS

TOILET-253.

4MEN-207

4MEN-2P5,

T0ILET.251

*MEN-203

EXPATRIATE! MESS

NAJjONAL MESS

<st LEVEL

QUARTERS LAYOUT

KJ

OUTBOARO PROFILE

DAVIE

171 LES CHANTIERS DAVIE LIMITEE T VIE SHIPBUILDING LIMIT ^

DAVIE HULL NO. 709 BOOKLET OF 0PERATIN6 CONDITIONS

DAVIE

171 LES CHANT1ERS DAVIE L1MITEE DAVIE SHIPBUILDING L TTED

DAVIE HULL NO. 709 BOOKLET OF 0PERAT1N6 CONDITIONS

PAGE NO. 17

CRANE CQLl

ANCHOR RACK

MUO r? affii

«UWVI^L CAPSULE Si PERSONS

DAVIT ANP HATTl

SCW C?NTRpL

CONOENSER

LUMN

MAIN ENG NES. RAD.&OIINT E S A N o i l ^

\CWANE COLUMN

SHALE SHAKES

SKIMMtW SETTLING

folD CANTILEVER WALKWAY

IPORT CANTILEVER WALKWAY

SW. BOARD

MACHINERY DECK LAYOUT

INKER BOTTOM TANK LAYOUT

D A V I E

rn LF^ CHANT1ERS DAVIE L1MITEE L.^VIE SHIPBUILDING LIMIT, j D A V I E

rn LF^ CHANT1ERS DAVIE L1MITEE L.^VIE SHIPBUILDING LIMIT, j

PAGE NO. 21 D A V I E

rn DAVIE HULL NO. 709

BOOKLET OF OPERATING CONDITION*

PAGE NO. 21 D A V I E

rn DAVIE HULL NO. 709

BOOKLET OF OPERATING CONDITION*

QUARTERS LAYOUT

DAVIE

171 \

Ltb LMAi \ i : tna U M vie uivmcc DAVIE SHIPBUILDING MM ITED

OA VIE HULL NO. 709 BOOKLET OF OPERATING CONDITIONS

PA6E NO.

SXJBSmCTURE ORIF LAYOUT

MCUPOWT rVATFOHM

mmi- \CWANt COLUMN

r XSHA lg SHAKT»

J2

40.0 MAX THAVll ATT

- 0 -

Critical Operations -2-and Curtailment Plan

7. Nippline. Up and Nippling Down Blowout Prcventors - BOPs will not be nippled down unless well is deemed to be in a saie condition. Safety oi personnel is oi highest priority during nipple up and nipple down operations, and use of lile jackets, safety lines or nets, and adequate pick-up 'ines by contractor personnel will be strongly encouraged.

Zm Minimum Mud Requirements at Well Site - Drilling will not proceed, when minimum amounts of mud materials or barite fall below minimum requirements of OCS Order #2, as specified on drilling program submitted with permit tc drill. Greater than minimum amounts will be kept on location in most cases, and as deemed necessary by operator representative.

9. Loaning and Wireline Operations - The mud weight shall be adequate to contain any exposed formations. The well will be monitored for flow during logging operations, and kept full at all times.

10. Hurricane Approach - Emergency procedures are provided for securing the well and evacuation of personnel in storm or hurricane situations.

11. Critical Welding and Burning Operations - Critical welding and buming operations will be conducted as outlined in Chevron's "Multiple Operations Guideline". r :

12. Drill Stem Testing and Production Testing - Drill stem testing and production testing will be performed in accordance with Chev -n's "Multiple Operations Guidelines".

13. Phitjting and Abandonment - The well will be plugged and abandoned in accordance with OCS Order #3. Plugging will not commence if the well is not under control. Blowout prevention equipment will not be removed prior to placement of surface plug. The OCS orders will be followed during the cutting and removal of casing and clearing the location.

1*. Person In ' ante - The person in charge at the site of all driliing operations for which Chevron is operator will be the Chevron operator representative. The immediate supervisor of the operator representative will be the Division Drilling Superintendent, Mr. L . C. Richie. Tne Division Drilling Superintendent, or his designated alternate, will be available to advise on matters concerning critical operations or curtailment of drilling operations.

3E/R3U6

DRILLING FLUID COMPOSITION

Gel , Fresh Water - Bentonite G e l , Selt Water - attapulgite Clay Bari tes - Berlin Sulfate Freeh Water and/or Sea Water

CHEMICALS a ADDITIVES

Aluminum Sterate A-Z-32 - Biodegradable surfactant Baraf loc , Flocculant - Polymer Baa-Ex, Flocculant-Po>.jTH. Caust ic Soda - Zt di — " <tde Chrome Lignasulf oru.r

C . L . S . - Chroma U . c a t s Q-Broxin - Fsrro^h «. Lignosulfonate Spersene - Jhrome Lignosulfonate Uni-Cal - Sodlua Lignosulfonate

L ign i t e Lenox - Lignite Tannat v In - Lignite Ligco - Lignite

Line - Calcium Hydroxide NFL-40 - Biodegradable-Surfactant Soda Ash - Sodium Carbonate Sodlua Bicarbonate Sodium Blchroaate Sodlua Acid Pyro Phosphate (SAPP) Carboxy 1 MethylceJ ..uae (CMC)

LOST CIRCULATION MATERIAL

Mica Walnut Shells Cellophane Flakes Fiber

STUCK PIPE

Diese l Oi l Pipe Lax - Surfactant Aromatic Process ) i l (Organic) O i l Fase - Fat*"* Acid - Basins Eavlsif * i .* clays Black Meglc - Air Blown Asphalt

Chemical ' V - Ro*ln Acids Chemical "V" - Naphteuic Acid OB Gel - Organo - Bentoaitic Clays

A l l l iquid aud w i l l be disposed of in compliance vith EPA requireaents.

(

CHEVRON U.S.A. INC EASTERN REGION

CENTRAL DIVISION

Critical Operation! and Curtailment Pian

Personnel safety and environmentai protection have highest priority when conducting any operations. Preplanning and work scheduling are maJe with these factors in mind.

Chevron recognizes the offshore operating hazards and the possibility of marine environment contamination. Every effort will be made to minimize the pollution possibility and to provide maximum safe working conditions for all personnel.

Listed below are operations which are considered to be critical.

1. Shallow Driliing Hazards - A shallow drilling hazards report will be submitted as required in Sec. 2.3 of OCS Order 2. Upon encountering shallow hazards, well will be controlled in accordance with Chevron's USGS approved "Well Control and Blowout Prevention Guide".

2. Drilling in Close Proximity to Producing Wells - Operations will be conducted as outlined in Chevron'* Multiple Operations Guidelines.

3. Moving Drilling RIRS On and Off Locations in Emergencies - Floater rigs and bottom setting drilling units win be secured by use of either hurricane plugs, cement, or BOP closure, if possible, when necessary to move rig off in emergency conditions.

e. Testing of Blowout Preventors - Drilling operations will not proceed until such time as the blowout preventor stack has been completely and successfully teited in accordance with Sec. 3.7 of OCS Order #2.

3. Well Kicks - After experiencing a well kick, drilling operations shall not be continued until such time as the wellbore is stable, safely overbalanced, and properly conditioned, in accordance with Chevron's USGS approved "Well Control and Blowout Prevention Guide".

6. Running and Cementing Casing -a) The well 1% to be carefully monitored during the last trip in the hole with

drill pipe p« ior to running casing. b) The mud weight shall be determined to be adequate to control formation

pressures in hole which is to be cased off. c) The well will be checked for normal hole fillup and mud displacement on

trip out of hole with conditioning assembly, and while going in hole with casing.

d) Flow line returns will be monitored while circulating or cementing. e) If a casing string sticks before reaching the desired depth and cannot be

freed, plans are to cement it in place, and notify proper USGS authority.

OCS - 5-676 <£

OC+-IW cue Stray iue-

40- Vk4. SC* 71

EXHIBIT " C PROPOSED WELLS

OCS-G-6766

Surface Bottom Hole Days to Weil Location Location PTVD Drill

•A" 2,700' FEL, 240S PNL Straight Hole 4,020' •?7

"B" 2,700' PEL, 2,«0f FNL 3.S30 FEL, 3,333' FNL 1,275' •37

•c- 2,700' FEL, 2,S0*' FNL 3,600' FEL, 1,301' FNL *,330'

2,700-FEL, 2401' FNL *,000» PEL, 2,033' FNL »,310'

2,700* FEL, 240*" FNL 2,700' FEL, l,*5T FNL •9,030' t*7

"F" 2,700' FEL, 240*' FNL l , W FEL, 3 , W FNL S,030' •37

aB61t

EXHIBIT "D" TENTATIVE ACTIVITY S C H E D U L E

F O R OCS-G-6766 L E A S E

Activity Beg in fabrication A CF St ructure* begin drilling propoeed wells "A" through " F " .

B e g i n fabrication of S. T . 52 " C " true ture.

Begin pipelines, complete fabrication and installation of " C F " Stmcture.

Complete pipelines and put well "A" on production.

Complete fabrication of South Timbalier 52 " C " production structure and begin installation.

Complete drilling of six (6) wells.

Complete Installation of "C** production structure and put wells "B" through " F " on production.

DeadUne

August 1984

September 19S*

November 198*

December 198 *

June 1985

July 1985

September 1915

EXHIBIT "E" RIG SPECIFICATIONS

GLOMAR HIGH ISLAND IX

Length Overall:

Bread tht

Depth of Hull:

Total Length of Each Legs

Heliports

Living Quarters:

Storage Capacity:

207*

176*

20*

340*

43' diameter

for 8ft persons

DrUl Water 4430 bbla. Potable Water •SO bbls. Fuel Oil 2250 bbls. Butt Cement 3400 cu. ft. Butt Mud 5100 cu. ft. Liquid Mud 1200 bbla. Sand Trap 200 bbla. Sack Storage 1100 aq. ft.

Main Drivers:

Generators!

Four (ft) Caterpillar D-399 TA (DieseO

Four (ft) 800 kw, 400 volt AC

APPENDIX I

AIR EMISSIONS REPORT

Introduction

Chevron U.S.A. Inc. plans to drill six (6) developmental weils in South Timbalier Block 51 (OCS-G-6766) at a surface location approximately l t miles from nearest mainland shore off the Louisiana coast. The wells will be drilled with the Glomar High Island IX or a similar drilling barge beginning in August 191*.

Tha primary sources of air emissions on the rig are the engines described be low:

Models Caterpillar D-399 TA Sizes 1000 HP Uses Power Generation Number of Unitss * Loads Varying Fuels Diesel

Fuel consumption records show the rtg bums approximately 2,000 gallons of diesel per day. Emission calculations are based on this fuel rate.

Support Vessels and Aircraft

Helicopters, crewboats, and support vesse 'a will travel to and from the rig for project duration. The definition of "facility" in Part 250.2 (ZZ) exempts vessels not transporting production. Therefore, none of these steals are included in this report.

Emission Calculation Bases

Average Fuel Usage per Engines

Total Horsepower All Engines - SOOO

Total Fuel Consumption per Day - 2000 gallons diesel

(I) Caterpillar D-399 TA @ 1000 HP each

1000 HP

*000 HP x 2 0 0 0 8 a , 5 - / d a y * 5 0 0 gaL/day/engine

Estimated Drilling Days

OCS-G-6766 -A - through "P» *37 days/each

TOTAL +222 days Assuming that drilling commences on August 1, 198a, and that the wells are drilled consecutively, there will be 153 drilling days In 1984 and 69 drilling days in 1985.

Emission Factors (from AP-42, Compilation of Air Pollutant Emission Factors. Table

Pollutant Emission Factor (sVlO*gaL)

CO 102

VOC 37.5

NOx **»

$02 31.2

TSP 33.3

CONCLUSION

After the drilling rig is moved off toca tlon, no further en. salon of pollutants will occur. (The drilling rig is a "temporary faciUty" according to the definition in Part 250.2 (fff).)

Due to availability, a rig other than the one stated mar oe substituted when the operation begin v. However, any rig ueed wiU be of similar design and wiU have similar emission characteristics. Substitution of another rig Is not expected to result in significantly different emissions.

It is possible thst the rig may be on location for a greater or lesser number of days than stated, bi any case, emissions are not expected to exceed the exemption amount based on distance to shore.

Projected emissions are less than the emission exemptions, therefore, this operation is exemot from further regulatory review.

4B61S

FREQUENCY AND DURATION OF EMISSIONS BY POLLUTANT

FOR YEAR

FACILITY-aa* TimfUtr H a g 51 ( O C S ^ 7 « )

S O U R C E Glomar High Island IX i<t) Ca t . D-399 TA

Pollutant Projected Emissions Frequency •a

Duratio Pollutant Tons/Yr Lbs/Day Distribution

•a

Duratio

TSP 5.1 67.0 • 153 Days

S 0 2 » . l 62.4 A constant emission

rate as assumed 153 Days

NO x 71.1 938.0 133 Days

voc 5.7 75.0 153 Days

CO 15.6 204.0 153 Days

Qtovf on Chevron U.SA Inc

lB7ie

FREQUENCY AND DURATION OF EMISSIONS BY POLLUTANT

FOR YF A R jg

F A Q | L 1 "J* V S o u t h T i m o * l i e r B l o c k 5 1 (OCS-G-6766)

SOURCE G l o m a r taUnd I X C*t* D O " T A

Pollutant Projected Emissions Frequency Distribution

Duratio Pollutant Tons/Yr Lbs/Day

Frequency Distribution

Duratio

TSP 2.3 67.0 • 69 Days

S 0 2 2.2 62.* A constant emission

rate as assumed 69 Days

NO x 32.* 93S.0 69 Days

VOC 2.6 73.0 69 Days

CO 7.0 206.0 69 Days

Chevron Chevron U.SA Inc

1B713

PROJECTED EMISSIONS FROM EACH SOURCE

BY AIR POLLUTANT FOR g«

South Timbalier 51 'OCS-G-6766) Glomar High island IX

Source AIR POLLUTANT (T/yr)

Source SOj NOx CO TSP VOC

No. 1 Cat D-399 TA 1,000 HP

1.19 17.96 3.90 1.2S 1.63

No. 2 Cat D-399 TA 1,000 HP

1.19 17.96 3.90 1.2S 1.63

No. 3 Cat D-399 TA 1,000 HP

1.19 17.96 3.90 1.2S 1.63

No. a Cat D-399 TA 1,000 HP

1.19 17.96 3.90 1.2S 1.63

ibic: • Fadlity

71.S 15.6 5.1 5.7

IB719

PROJECTED EMISSIONS FROM EACH SOURCE BY AIR roUUTANT FOR "»

South Timbalier 51 (OCS-G-6766) Glomar High Wand IX

Source AIR POLLUTANT (T/yr)

Source SOj NOx CO TSP VOC No. 1 Cat D-399 TA 1,000 HP

0.5* 8.09 1.76 0.38 0.65

No. 2 Cat D-399 TA 1,000 HP

0.54 S.09 1.76 0.58 0.65

No. 3 Cat D-399 TA 1,000 HP

0.54 8.09 1.76 0.58 0.65

No. * Cat D-399 TA 1.000 HP

0.54 8.09 1.76 0.58 0.65

Total From Facility

2.2 32.4 7.0 2.6

1B720

SUMMARY OF EXEMPTION CALCULATION INFORMATION

South Timbalier Block 51 (OCS-G-6766) 1984

Pcllutont FofTTIulQ D (miles) •SK&) Emissions S E ?

TSP E«333D 13 599 3.1 Yea

S02 E=33.3D i i 399 4.8 Yea

NOx E'3a3D I I 599 71.8 Yea

VOC E-33.3D is 599 5.7 Yes

CO E*34X)D] i t 23,332 15.6 Yes

16716

«

SUMMARY OF EXEMPTION

CALCULATION INFORMATION Sou th Timbalier Block 31 (OCS-G-6766) 1985

Pollutant Fbrmuki D (miles) Envisions

I E ?

TSP E'3330 11 395 2.3 Yea

so. E-33.3D i t 399 2.2 Yoa

NOx E<333D i t 399 32.* Yea

VOC E'33L3J) i t 399 2.6 Yoa

CO E=3400D* i t 23,332 7.0 Yoa

IB717

HIGHEST ANNUAL TOTAL AMOUNT OF

PROJECTED EMISSIONS BY AIR POLLUTANT

South Timb»Uer Block Jt (OCS-G-67M)

Fbllutant Year of Highest

Emission P w i ^ E r j - s i o n

1984 4.8

NO x

I t t * 71.8

TSP 1984 3.1

CO 1984 13.8

VOC

•

1984 5.7

1B718

used by offi drill: r e rr«\"s, r «--• ired wh»-i worki. i with, cr txi^stc to. o i l base rcuds or o.her erosive chtn.icils ind g.*ses which .-.ay be harzaiul to Operator ot Contractor 1! personnel.

Coet o£ eervices, equipnent, and labor to'prepars the drilling unit and/or any Contractor-furniihed equipnent tb be compatible with Operator-furnished equipment including platforms.

JUN 181984

ma uo

ENVIRONMENTAL REPORT (DEVELOPMENT)

SOUTH TIMBAUER BLOCK 51 (OCS-G-4764)

CF STRUCTURE

CHEVRON U.S.A. INC N J ORLEANS, LOUISIANA

June 13, 1980

Contact Personi

E. D. Shipman P. O Box 23709 Harahan, LA 70113-0709 Phone: (50*) 734-4011

ENVIRONMENTAL REPORT

(DEVELOPMENT)

SOUTH TIMBALIER BLOCK 31

(OCS-G-6766)

CF STRUCTURE

CHEVRON U.S.A. INC

NEW ORLEANS, LOUISIANA

Jun* 13, 191*

DESCRIPTION OF THE PROPOSED ACTION

This Environmental Report deals with the drilling of six (6) development wells .md the

installation of the associated production structures by Chevron U.S.A. Inc. in South

Timbalier (S.T.) block 31 (OCS-G-6766). The block is located approximately 1" miles

south of Timbalier Island in Timbalier Bay and IS miles from nearest mainland shore oil

tfte Louiaiana coast. Vater depth is approximately 53'.The location of the block in

relation to the Louisiana coast U shown in Exhibit "A".

The first weli (OCS-G-6766 "A") will be a strait .t hole located 270f' r E L and 2S0T FNL

of South Timbalier Block 31. The subsequent wells (OCS-G-6766 "B" through *¥*) will be

directionai holes drilled adjacent to this same surface location. A six (6) slot four (*) pile

structure (CF Platform) is scheduled to be installed h November 191*. The location of

the proposed wells and structure are shown in Exhibit "B". A brief description of each of

the proposed wells is given in Exhibit N C*.

Environmental Report (Dove'opment) South Timbalier Block 51 (OCS-G-67M) C F Structure Peg* 2

OU end gaa production from the propoaed wells will be sent by pipeline to Chevron's

existing South "'Imbaiier 32 "A" facility for field processing. At present this facility is

boing enlarged and an adjacent " C structure installed (originally designated "D"

structure). Production from the six (a) propoeed wells will follow a route from the

proposed Cf structure to the proposed CE Structure to the proposed CD Structure (both

of those structures were discussed in a previously submitted Environmental Report) and

then to tf* existing South Timbalier 52 "A" Structure as shown in Exhibit B. At present

no information is available on the proposed pipelined) from CF to CE Structure.

Quantitative oil and gas production estimates for the proposed wells are unavailable at

this time. However, a.iy oil and gas produced will be handled as is presently done. Oil

will be pumpeJ to Chevron's existing Fourchon Terminal. Gas will be transported by an

existing Trunk lir. J Gas Comp. ny pipeline to Shell's Calumet Plant for liquids extraction.

A vsntative activitirs schedule for the proposed project is given in Exhibi. D.

Tha propcsed wella will be drilled with the High Island DC or a aimilar ria. A brief

description of the rig is given in Exhibit E.

Tha support base for the project is Chevron's existing base at Leeville, Louisiana

approximately 30 miles northeast of the block. No new personnel or facilities will be

necessary for this project.

Environmental Report (Development) South Timbalier Block 51 (OCS-G-*7M) C F Structure ftft 3

Travel routes (or boats will be from Leeville down Bayou Fourchon to the open Gulf (see

Exhibit "A"). Crewboats (S0-n5') and supply boats (125-195*) will be utilized. Generally

there will be one round trip made every two days.

Air service will he provided by helicopters (probably Bell Jet Rangers) and will average

one or two round trips per day. Tlie aircraft will probably take a direct route from

Leeville to the rig, condit'wia permitting.

No new technique or unusual technology that may affect coaatal waters will be used ln

this proiect

DESCRIPTION OF THE AFFECTED ENVIRONMENT AND IMPACTS

A. Physical and Environmental

1. Commercial Fishins

Minos, temporary impacts to commercial fishing will result from the discharge

of J. illing mud and cuttings for the duration of the driliing period. Such

discharge w.'li cause an increase in turbidity in the immediate area of the

activity which will likely be avoided by commercial species and, therefore, be

temporarily less productive.

Environmental Report (Development) South Timbalier Block i\ (OCS-G-6766) CF Structure Page*

The major commercial fisheries offshore Louisiana are menhaden (Brevoortia

patronus). shrimp (Penaeus sp.), and vsrious other finfish including seatrout,

mackerel, and snapper. Visual No. * of the Regional Draft Env ronmental h.ipact

Statement (DEIS) for the Gulf of Mexico shows S.T. Blork Ji in a productive

fishing zone.

Tha most significant reason for the productivity of the Gulf offshore Louisiana is

the extensive estuarine areas cf the coast which serve as a breeding ground

and/or nursery for many species. The proposed driliing is not expected to affect

these estuarine areas for two reasons: (1) the distance of the block from shore,

and (2) the dominant current drift is west northwest parallel to the shoreline, not

directly to shore.

Oysters form another important coastal Louisiana fishery. Most of the major

oyster producing areas are located east of Vermilion Bay and in no way are

expected to bs affected by the proposed project.

The temporary impact caused by the driliing activity will be alleviated when the

wells are completed and the discharged particulates settle to the Gulf bottom.

The presence of the rig and/or the presence of the proposed structure wlll cause

a loss 0/ a small area for exploitation by commercial fisherman who primarily

use trawls. This should have no noticeable effect on the total commercial catch

becauje of the comparatively small size of both the rig snd the proposed

Environmental Report (Developmeat) South Timbalier Block 51 (OCS-G-*?* * ) C F Structure Page 5

structure. Installation ot the propoaed fiowlineCs) is also not expected to affect

commercial fishing in any wa>.

2. Sport PjfMm ind Recreation

No significant impact on roac rea tional boating is anticipated as these activities

are usually conducted cic " to shore. Recreational beaches along the coastline

are alse not likely to be affected in any way by this project due to distance from

shore and dominant current drift.

Sport fisherman may use the area in search of mackeral, cobia, snapper, and/or

other sport fishes. Other than a temporary loss of fishing area due to mud and

cutting discharge, no Impacts are expected. Sport fishing may actually be

enhanced in the aroa as rigs or platforms tend tc act as artificial reefs

attracting and holding a variety of marine life.

3. Shipping

S.T. Block 51 Is located approximately 9 miles southeast of the nearest safety

fairway at Timbalier Bay. The prooosed project, therefore, is not expected to

interfere with commercial shipping In the Gulf. There is always a possibility of

vessels not traveling In safety fairways colliding with a fixed structure such as a

platform or rig. Th . probability of such an occurrence is considered minimal as

Environmental Report (Development) South Timbalier Block 51 (OCS-G-*766) C F Structure Page 6

yjch structures are well-lit and are equipped with the required navigation

markers. The rig may actually be an aid in navigation as a ref renee point and as

• source ot heip in an emergency.

Cultural Resources

S.T. Block 51 is located inside the cultural resource sensitivity demarcation line

as shown on Visual No. 11 of the Regional DEIS for the Gulf of Mexico. An

ar cha JO logical survey has been flled as required.

5. Ecologically Sensitive Features

There are no ecologically sensitive features located within or near S.T. Block 51

The *V -siier Wildlife Management Area Is located onshoapproximately 22 miles

northeast of the block. The proposed activity is not expected to disturb this area

in any way because of thc distance involved.

6. Pipelines and Cables

There are several existing pipelines in S.T. Block 51. All of these tie into the

existing production facilities at the S.T. Block 52 "A" Structure.

Environmental Report (Deve'opment) South Timbalier Block 51 (OCS-G-676*) C F Structure Pag* 7

As previously discussed, new flowline(s) are included in the present proposed

plan. In .tailation and operation of these lines is not expected to adversely affect

the environment in any way.

The locations of the existing and proposed flowlines are shown in Fxhibit "B".

7. Other Minerals

There are no known plans at this tiroi to develop minerals other than

hydrocarbons which may occur on these blocks.

8. Ocean Dumping Activities

Ocear. dumping is prohibited in this block. All non-sewage wastes will be either

incinerated or transported to shore for dispo^.*. No solids containing free oil

• li be disposed into the Culf.

Sewage and deck drainage discharges will be treated and monitored to assure

compliance with applicable guidelines.

Environmental Report (Development) South Timbalier Block 51 (OCS-G-47ee) C F Structure Paget

9. Aif Emiaaione

Due to the distance from shore and the excellent ambient air quality in the Gulf

region, impacts of air emissions from this project are not expected to be

significant. (For additional information see the Air Emissions Report, Appendix

u

10. Endangered Species

All of the marine turtle*, found In the Culf of Mexico are either threatened or

endangered, and may use the northern Culf as a feeding ground. Only one

species, the Loggerhead (Caretta caretta). uses the Louisiana coast for breeding,

but it most often nests east of the mouth of the Mississippi River. The rarest of

the Guli sea turtles, the Atlantic Ridley (J-epidochelys kempj). nests only on a

small stretch of beach at larr ulipas, Mexico. Therefore, no adverse impacts

are expected on these animals other than a temporary loss of a small area for

feeding.

Several marine mammals may also be found in the northem Gulf off the

Louisiana coast, two (2) of which are endangered. These are the Giant Sperm

Whale (Physeter catadon) and the Fin-backed Whale (Balaenoptera phy sa lis).

Other cetaceans more commonly found in the area are the Atlantic Bottlenosed

Doiph'r. (Tursiops truncatus). the Spotted Dolphin (Stenella plagiodon), Common

Environmental Report (Deve'oprnent) South Timbalier Block 31 (OCS-G-6766) CF Structure Page 9

Dolphin (Dclphinus delphis) a ' the False Killer Whale (Pseudorca crassidens).

Again no impact is expected other than s temporary loss of a small area which

may be used for feeding.

Any terrestrial endangered species of the Louisiana coast are not likely to be

affected in any way by this project because of its distance from shore.

The probability of collision of vessels with large marine animals is considered

very small because * the relatively rare occurrence of these animals in the

Culf. Disturbance to the biota of coastal communities by commuting vessels is

considered minimal in an already well traveled area.

B. S o c i o - E c o n o m i c s

As previously stated, no new personnel or facilities will be required for this project.

A more detailed socio-econmic data base -eport, including ail of Chevron's OCS

activities, will be available when USGS guidelines for said re pert are finalized.

UNAVOIDABLE ADVERSE IMPACTS

According to the Regional DEIS for the Gulf of Mexico, no major, long term, irreversible

impacts wil result from development of S.T. "lock 31. However, several minor impacts,

primarily those dealing with the discharge of drilling mud and cuttings have been

identified.

Environmental Report (Development) South Timbalier Block 31 (OCS-G-6766) CF Structure Pace 10

Upon entering the water column, the drilling mud and cuttings will form a turbid aree

which will reduce the primary productivity of photosynthetlc organisms by reducing light

penetration in the water. The size and longevity of the turbid plume will depend on the

amount of discharge, the size of the particulates, and the current flow. The increase in

turbidity will cause a temporary loss of fishing area for both commercial and sport

fishermen as animals will probably tend to avoid the disturbed area.

A precise estimate of discharged mud and cuttings is difficult to make. Using information

presented in Table I-l of the EIS for Sale No. *5, and the estimated total depth of all

wells (56,035'), 3,820 tons of cuttings and 1,290 tona of mud components will be produced

during this proiect. The accumulation of the discharged material as it settles to the

bottom may smother any benthic organisms present. Becuase of the relatively non-toxic

nature of the cuttings and freshwater based drilling mud to be used, this impact is not

irreversible. Recoionization of the affected area is expected to proceed rapidly.

In addition to a tempr-ary loss of fishing area caused by turbidity, the presence of a rig or

platform will prohibit trawling in its immediate area.

Other than some minor bottom disturbances upon installation, the presence of the

proposed pipeline(s) is not expected to adversely affect the environment.

The discharge of treated sewage from the rig or platform should have no major impact

considering its relatively small amount and its dilution once in the Gulf.

Environmentai Report (Development) South Timbalier Block 51 (OCS-G-0766) CF Structure Page 11

In the unlikely event of en oil spill, some damage would result to the environment

depending on amount and conditions. A small animal, such as a copepod, would surely be

killed if i t encountered a hydrocarbon spill. Larger animals, such as marine mammals or

birds, might aiso be kilted or injured if they encountered large quantities of spilled oiL If

spilled oil was to drift ashore, there would likely be some damage to the immed' »e area

of its landfall. However,the record of the oil industry offshore Louisiana is very good and

with the implementation of new safety standards and equipment, i t is improving

constantly. When compared to land based industrial pollution and land runoff, spilis from

the off-Sore drilling industry are small.

Chevron is a member of Clean Guif Associates and has access to the latest pollution

control and cleanup equipment. An approved oil spill contingency pian has already been

filed by Chevron as required.

Air emissions from equipment on board the rig and from vessels and aircraft to be used

are negligible when distance to shore and the excellent ambient air quality of the region

are taken into account.

The impacts discussed are all considered to be mine*, temporary, and localized.

Implementation of the proposed project is not expected to cause irreversible damage to

the environment.

tBe-lt

REFERENCES

Behler, John L. and F. Wayne King. 1979. Th* Audubon Society Field Guide to North

American Reptiles and Amphibian*. Alfred A. Knopf, New York. 719 pp.

Conant, Roger. A Field Guide to Reptilet and Amphibians of Eastern and Central North

America. Houghton Mifflin Company, Boston. 429 pp.

Lowery, C H. 1974. The Mammals of Louisiana and Its Adjacent Waters. Louisiana

State University Press, Baton Rouge. 565 pp.

U. S. Department of Commerce. 1980. Louisiana Coastal Resources Program Final

Environmental Impact Statement. Office of Coastal Zone Management,

Washington, D.C

U. S. Dapartment of the Interior. 1978. Final Environmental Impact Sutement for OCS

Sale 43. Bureau of Land Management, Washington, D.C

U. S. Department of the Interior. 1980. Final Environmental Impact Statement for OCS

Oil and Gas Proposed 1981 Sales Ae* and 64. Bureau of Land Management, New

Orleans Outer Continental Shelf office, New Orleans.

U. S. Department of the Interior. 1982. Draft Regional Environmental Impact Statement

- Gulf of Mexico. Minerals Management Service, Gulf of Mexico OCS Region;

Metairie, LA.

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The proposed activity wil l be cur led out and completed with the guarantee of the fol lowing items.

1. Th* best and safest techniques will be utilized throughout th * proiect. This includes meeting all applicable requirements for equipment types, general project layout, safety systems and equipment and monitoring systems.

2. A l l operations will be covered by a USGS approved oil apill contingency plan.

3. A l l applicable Federal, State, and local requirements regarding air emission and water quality and discharge for the proposed activit ies, as well as any other permit condition, will be complied with.

0B618