In Reply Refer To: MS 5231 August 10, 1990

Chevron U.S.A. Inc. Attention: Rtf, J . H. Daniel Poet Office Box 61«90

New Orleans, Loui a lana 70161 flOTtO — KRAMLl

Gentlemen:

Reference la made to tho following plan received Auguat 7, 1990:

Typ« Plan - Supplemental Plan of Exploration Lease • OCS-C 5909 Block - 161 Area - Green Canyon Activities Propoaad • Wall C

In accordance with 30 CPR 250.33, thla plan la hereby deemed submitted and la now being conaldered for approval.

Your control number la S-2515 and should ba referenced ln your communication and correspondence concerning thla plan.

Sincerely,

(Orig. Sfd.) A. Donald Giroir

D. J . Bourgeois Regiot . Supervisor Field Operationa

bcc: Lease OCS-C S909 POD Pile (NS 5032) I MS 5034 w/public info, copy of Cha plan

AGobert: cck: 08/08/90: PGSCOM

Chevron Chevron U S A. Inc PO Bo> o W i New Orieans IA /0I6!

j H Oan«ei

August 6, 1990

Proposed Supplemental Plan of Exploration Green Canyon Block 161 KS-6-5909 "C*

CERTIFIED MAIL - RECEIPT REQUESTED

U. S. Department of the In te r io r Hlnerals Managenent Service 1201 Elmwood Park Blvd. New Orleans, LA 70123-2394

Gentlemen:

Chevron U.S.A. I nc . , operator for the Green Canyon Block 161 OCS-G-5909 lease, anticipates that one (1) additional well may be necessary to delineate the hydrocarbon potent ia l o f th is t rac t .

The locations of the one (1) proposed well Is as fo l lows:

1 . A geophysical checkshot survey Is planned In a subsequent sidetrack well either at t o t a l depth or some lesser depth u t i l i z i n g an a i r gun as an energy source and an In-hole geophone as a receiver.

2. A Cultural Resource report Is not being f i l e d for OCS-G-5909 lease. A hazard survey has been f i l ed for the OCS-G-5909 lease and there are no amplitude anomalies within 1700' of the proposed well location down to

3. We plan to u t i l i z e e seal-submersible r i g s imi la r to tha "Ocean American" to d r i l l these w e l l s . (Specif ication attached)

Safety features w i l l Include woll control and blowout prevention equipment at least as good as described In OCS Order 2. Appropriate l i f e r a f t s ,

Surfact Locition "C" 1984' FSL & 2768' FWL GC 161

1500' BML.

P2F826

Department of the Interior 2 August 6, 1990

life jackets, ring buoys, etc. as prescribed by the U.S. Coast Guard, will be provided. Pollution prevention and control features will Include all necessary coaming drains and holding tanks to prevent contamination of thi sea, In accordance with OCS Order No. 7 "Pollution and Waste Control".

4. The "C" well is currently scheduled for drilling as early as August IS, 1990.

9. Onshore, fid lit lai The service base for this area will be Leeville, Louisiana. Numerous service facilities. Including mud companies pipe companies, dock space, warehouse, helipads and the like are found here. These existing facilities will be utilized and are considered adequate tc handle the various jobs without any expansion or significant changes In activity levels.

6. Oil-Soill Contingency Plan

Chevron U.S.A. Inc.'s 011 Spill Contingency Manual was approved on May 25, 1989. Chevron maintains at Its own expense various types of equipment to deal with oil spills. Included are boons, large and small vessels, skimmers and the like. Additionally, Chevron 1< a member of Clean Gulf Associates. In the unlikely event that a spill occurs, even though It may not be originated with a Chevron operation or facility, an alert procedure Is Immediately Instituted. Immediate notification Is made to the Division Manager level a.id to appropriate Federal and State Aqencies. At the same time, efforts are begun to stop and contain the spill and to assess what, if any, equipment will be needed.

If the spill Is too large for the on-site personnel to control, Company equipment, facilities and personnel will be Immediately marshalled and, If needed, Clean Gulf Associates will be called In. Chevron bases at Leevllle, Bayou Boeuf (Morgan City), Cameron and Sabine Pass are on a continual standby basis with appropriate contingency responses assigned to them. Clean Gulf Associates maintains facilities and equipment at Grsnu Isle, Louisiana. The primary oil spill base to be utilized will be Grand Isle. An estimation of the response time for procurement of the equipment, equipment transportation vessel, and the personnel to load and operate the equipment U 4 hours, equipment load-out Is 1-1/2 hours, travel to the deployment site 1s 13 hours, and equipment deployment is 1 hour.

7. A1r EilMlona/Epvlronittnti The Air Emissions/Environmental reports for the drilling equipment to be used for Green Canyon Block 161 are attached.

PWPUC MBFORMf Tiflfl

P?F826

Department of the Interior August 6, 1990

To comply with requirements of 30 CFR 250 34, the following Information is attached:

Location Pi at Vicinity Nap Rig Schematic - Specification A1r Emissions Report

Time to complete OCS-G-5909 "C" Is ± 80 days.

I f any additional Information Is required, please contact Ns. Shirley Rondeno at (504) 569-3729.

Very truly yours,

P2F826

HWB INFORMATION

Green Canyon Block 161

DESCRIPTION QF ENVIRONMENTAL SAFEGUARDS AMO POLLUTION PREVENTION

The Final Environmental impact Statement for Gulf of Mexico Sales 123 and 125 for the Central and Western Planning Areas dated August, 1989 discusses trajectory simulations. An ell spil l from the Green Canyon Block 161 Is In a land segment with less than 0.5% probability of one or more contacts within 10 days.

i f a spill should occur from proposed location, Chevron would Immediately activate Its 0.' Soill Response Team, determining from current conditions the probable location i id time of land fal l . Then using the Clean Gulf Operations Manual, Volume II , Louisiana Naps 6 and 7, Identify the biologically sensitive area and determine the appropriate response mode. Upon activation of the proper equipment, Chevron would deploy It as suggested by Section VI of Volume II of the Clean Gulf Operations or as appropriate to effectively respond to site specific circumstances.

During drilling operations, domestic wastewater (consisting of water from human body wastes, showers, dishwashers, etc.) will be discharged Into the Gulf after treatment using the rig's U.S. Coast Guard approved treatment facility. The volume of treated domestic wastewater during drilling Is expected to be a maximum of 1250 gallons/day, based on &5 gallons/man/day.

Dr i l l cuttings are dumped overboard after screening and recovering the liquid phase (mud). This procedure Is followed only after the mud system has been tested via bloassay and the LC50 value 1s greater than 30,000 ppm. The bloassays arm performed regularly and In accordance with NPDES regulations. In the event oi l Is Introduced Into the system, all dumping of both tne liquid and solid phases Is ceased. After the solids have been screened, they are placed In approved containers and shipped to our shore base and on to a State-approved disposal site via an approved carrier. The liquids tnat are not retained for reuse ara disposed of In the same manner. Dumping will not be resumed until the system has attained an acceptablo LC50 value and the oil has been removed from the system.

Calculation of the discharge rate 1s done by the monitoring of solids control equipment which shows the generated hole volume and the volumes dumped from solids laden pits such as the sand trap. Calculations are made to Insure that the maximum discharge rate of 1000 barrels/hour Is not exceeded.

During drilling operations approximately 7125 barrels of cuttings will be discharged. Approximately 150 barrels a day of mud will be dumped through fluid lots through sor-J control equipment. After the total depth 1s reached, a total of 2000 barrels of mud will be discharged.

P2F529

In accordance with tho requirements of 30 CFR 250.67, bated on scout ticket data fro* the Conoco wells In Ewing Bank Blocks 828 and 872 and the BP-Hob 11 wells in Ewing Bank Blocks 826 and 782, no H,S Is anticipated In the drill lg of any wells on the OCS-G-12133 lease. Although no specific testing for ILS has been done, we feel that we will not encounter H,S In drilling the proposed wells. Chevron hereby requests that the Area In which the operations will be conducted be Classified as an area where the absence of H2S has been confirmed.

P2F529

CHEVRON! T) -EXXON

• \

161

65909

II CHEvnONI T)-EXXON

PWUC WFORM*™*

CHEVRON U S A INC EAST!NM RCOIOM

GREEN CANYON BLK 161

SURFACE LOCATION

SCAU ' i f

©©IMS

Harsh Environment/Deep Water Service Self-Prooelled Semisubmersible

Drilling Unit

Designed By:

i O c t i a n D r i l l i n g & E x p l o r a t i o n C o m p a n y

e e i e e tuiubiNO i t e e C * N « L f T n t t T

P. o. B O X « i7ao N E W O N L C A h f . l_A- 7 0 H I

7/39

OCEAN AMERICA

GSmWL OESCKIPTIOH AMP EQUIPMENT LIST

Tht OCEAN AMERICA H an Inhoust, OOECO designed, deep water totally self propelled semi submersible drilling unit designed to aerate 1n severe environment areas of tne world. Ennanced stability- structural strength, nigh perfonaance snd efficiency where OOECO's guideline 1n tne development of this unit which include Incorporating tne necessary winterlzatlon and deck load capaci tv to enable 1t to operate both 1n typical North Sea type envi roreenu. conditions and In remote deep water ar«.as for extended periods without regular logistic support. Structurally, the OCEAN AMERICA Is designed to withstand simultaneous loading of 120 knot winds, 3 knot current and waves of 110* height at IS te- pared and 80' height at i l sec. period.

A. 6£ NERAL DESCRIPTION

length hull Ungth 390'-0" Overall width of lower hulls (excluding holsters) 23J'-U" Lower hul 1 ship-shaped pontoons (width) 57' 0" Lower hull ship-shaped pontoons (depth) 28' 0" Diameter of stability columns 48' 0" 01 matter of structural columns 23' 0" height of upper dock above bottom of hul I 142' 0" Transit draft (maximum) Drilling draft (nasinel) 80' 0" Safety draft (depending on deck load and disconnect) 01 stance from rotary to water at 80' draft A1r gap at 80' drilling draft 40'-0" Drilling draft displacement ( ) (knot winds) long tons Safety draft displacement ( ) (100 knot winds) long tons Transit draft displacement ( ) long tons Maximum opening through cellar deck Cellar tack maximum vertical clearance

Variable deck load at transit - long tons Variable deck load at safety draft (100 kt. winds) long tons

• Variable deck load at drilling draft (8b kt. wind) 7 5 ^ 3 long tons r'~'

MATH PERTH EAT IMS; Minimum 138' 0" Maximum 4,500' 0"

• lf the 86 kt. allowable KG curve Is In use, there mutt be a plan to revert beck to the 100 kt. allowablt KG curvt within 46 hours 1n the event of winds in txcess of 85 kts. ere predicted.

APPROXIMATE NATURAL PER100S: Roll PUcn Heave

45.1 seconds 43.6 seconds 21.1 seconds

CAPACITIES:

Bulk storage capacity: In columns: 20,000 cu ft On Dec*: 4,000 Cu ft

Liquid mud capacity: Ha1n pits 2,494 BBL Mud - t tum pits SOO BBL

Sack storage capacity: 16,430 Sacks Fuel 011:

Lower hulls 13,484 BBL Upper deck 603 BBL

Dril l water (In lower hul ls ) : 16.300 BBL Potaole water (1n columns): 1,260 BBL Lube o i l : iOO BBL Base 011 Storage (lower hul I) : 2.000 BBL Completion fluid storage (lower hu l l ) : 2.000 BBL Substructure (combined loading): 3,280 kips

AREAS:

Main Deck 21,860 sq f t Dr i l l Floor (clear area) 2,200 sq f t Cellar Deck 8,500 sq f t Mud and Cement Sack Storage 3,740 sq f t Pipe Racks (clear area) 11,375 sq f t Other stores and workshops 19,800 sq ft

LIVING QUARTERS: 102 men

HELIDE(X: 89' x 89' - rated for Boeing BV 234 'Chinook' twin rotor helicopter.

PROPULSION SYSTEM: Propulsion 1s provided by four (4) 2.700 hp El Hot double armature OC e lectr ic motors each driving a single four o laded, 3.1 meter diameter propeller. Two (2) propellers are on each of the two lower hu l ls . Steering 1s provided by electrohydrauUcally operated dual rudders on each of the lower hulls.

- 2 -

I M U M SYSTEM:

Anchor Ml nch/ Windlass: Two (2) Skagit combination chain/wire root elec­tric anchor winch/ wind lassos art installed on each of tho four staomty columns (total of 8) each with tho following characteristics:

Chain drum 8 pocket Rated load 448 kips Speed at rated load 50 ft/min 8and brake capacity - 1,450 kips Dynamic (motor) brake

capacity t 450 ft./min. - 150 kips Chain stopper capacity - 1,450 kips Stall load - 670 kips Driver - 800 hp GC 752

OC motor Parmac ¥-80 dynamic brake - 5,000 hp

All winch/windlasses and control units are en­closed and protected from weather. Emergency release capability from the ballast control room 1s also provided.

Fair leader: Eight (8) swivel type fair leaders.

Anchors: Eight (8) "Moorfast" anchors, 20.4 NT each (45,000 lb.)

Anchor Chain/WI re Rope: 3,900' of 3-1/4" special strength (oil r*- ORQ plus 20 percent) chain, and 5,800' of 3-1/2", 6 x 38 wire rose for each windlass unit.

Chain break test: 1,450 Hps Chain proof Teat: 1,015 kips — Mire Rone break Test: 1JS0 kips

Eight (8) permanent chain chasers

C U S : ABS - AMS Maltese Cross A-l M Column Stabilized Drilling Unit for Unrestricted Ocean Service.

REGISTRY: U.S. fUg/u.S. Coast Guard Drilling unit to also comply with applicable UK DEN, U.S. MMS and SOLAS Regulations.

•• mix FLOPS. EQUIr̂ EMT

1. Drawworks - Continental Emsco Ci, Typt II compltte witn heavy duty Dretech ISObO auxiliary brake. Catneads, 2-motor drive skid unit, sand reel, crown-o-mat1c and leous grooving on trial for l-b/8* dri l l hmt. Drawworks driven oy two (2) GE Kinematic OD 9742, 1,750 hp OC motors.

2. Derrick - Bran nam Industries, Universal Stem Log Otrrick '#0' a 40* a 18$', 1,800,000 IDS. gross nominal capacity, 1,400,01X1 lot. static hook load capacity with 14 linos strung, complete w1'Ji crown olock, guide systte fo-- block tnd motion compensator, BJ lower recking ana and racking capacity for 25,000' tf 5" drill pipe. Adjustable casing stabbing board for 30' to 50' casing ran**.

3. Top Drive - Varco TDS-3 1,000 hp (1250 hp intermittent) top drive drilling system, driven by 6E-752 DC motor, complete with pipe nar.d ler, remote upper stf ety valve, torque wrench and link actuator.

4. One (1) dri l l string motion compensator, NL Model 18/800 with 1.500,000 lb. static load capacity. 800.000 i t . compensating load capacity, with Integral traveling block grooved for 1-5/8" dri l l

5. One (1) I J Model 5750 Dynaplex hook (750 ton).

6. One (1) Continental Emsco Model L8650 swivel (650 ton).

7. One (1) Continental Emsco T-49S0 (49-1/2") rotary mounted with 800 hp GE-7 52 OC motor with transmission.

8. One (1) Me they "Surveyor" wireline unit. Model GCS-B2, with 10,000' of 0.105" wire Hmt; hydraulically powered.

9. Deadline anchor,

10. One (1) Varco Iron Roughneck/pipe handling system which incorporates a hydraulic operated combination spinning and torque

11. Standard dr i l l floor instrumentation consisting of dri l ler 's con­sols with weight Indicator end reltted readouts for mud pump pres­sure, mud pH vclumes, asm) flow, mud gain/loss, rotary torque, nttttdera for readouts.

12. One ( l ) s i r ctndltloeed/hetted operations office located at the dr i l l floor with all 'emote Instrumentation required to monitor tnd observe the drilling functions.

13. Oat (1) air conditioned/heated dril ler's console house located at dr i l l floor.

4

HJO SYSTEM AMP EQUIPMENT

1. Thrtt (3) Continental Emsco FB-1600 triplex and pumps compleu witn pul set len oeapmntrs, relief vel ves, discharge assemblies with strainer, pressure gauges, oiecheree manifold emi Hmer wish pumps. EecJi pump powered by one (1) 1,750 hp di rea drive 6E Kinematic CD 9/42 OC meter.

2. Two (2) 6 x 8 R Mission Magnum centrifugal pumps each with 100 hp electric motor for low pressure mud mix service.

3. Two (2) 6 x • R Mission Maonum centrifugal pumps each with 100 hp electric motor for emerging main mud pumps.

4. Two 12) 6 * 8 R Mission Magmmm centrifugal pumps each with 100 hp electric motor for desander service.

5. One (1) Brandt triple tandem shale shaker. Capacity 1s 1,800 gpm with 18 ppf ami.

6. One (1) triple Derrick Flowline Cleaner. Various mud characteristics and drilling rate may effect screening capacity. Average flow with 40 viscosity mud Is 286 gpm using i f f moth screens as token from the Derrick Solid Control Equipment Capacity Chart.

Hote: The OCEAN AMERICA Is equipped with a cascading mud return system. The Brandt triple tandem scream shakers are located In the shaker house. The triple Derrick Flowline Cl aimers are also located In the shaker house and downstream of ths Brandt unit.

7. One (1) SWACO degasser.

8. One (1) mud/gas separator, atnospherlc type.

9. One (1) Sweco desander.

10. One (1) Sweco duel 12 come each side mud cleaner.

11. Ose (1) decent 1ng end centrifuge. Sweco Model 414.

12. One (1) sot basic mud testing equipment complete with sink and cab­inet located lo air conditioned end heated mud engineering i t * space.

13. Ont (1) t r ip tank complete with visual, mechanical and electrical fluid level Indicators.

14. Four (4) taxing hoppers (2 - «ud, 2 - chealctl).

15. Ont (1) cht»1ca1 tUxtr.

14. Nut tttrtgt tnd treatment pits consisting of:

Three (3) active pits - 625 ML capacity eacn Tut (2) active pits - 220 ML capacity eacn One (1) slugging pH - 124 ML capacity Ont (1) slugging pH 69 ML capacity Ont (1) p i l l p- 40 ML capacity Five (S) mud r -n / t rea t ing f i ts - 100 ML capacity each

Total liquid mud capacity 3,060 MLS

17. Nut pit agitators In eacn of tht active, slugging tnd pill pits (total of 4 ) . Mud pits equipped with ooth high and low pressure out guns.

lo. ont (1) 2,000 I t i capacity drilling fluid base oil storage tank with pumps and plpir-j to out treatment area and supply boat loading stations.

29. Ont (1) 2,000 BBL Print completion fluids tank with pumps and piping to mud treatment trot tnd supply boat loading stations.

20. Dual standpipes amt standplpe manifold, 5,000 ps1 MP.

21. Two (2) rotary hoses - 75' x 3-1/2' 10, 5,000 psi UP (10,000 psi toot).

22. Bulk P-tamks for barite and cement service consisting of:

4 - 3,500 ft* tanks m columns - 14,000 ft* (oente)

4 - 1,500 ft* tanks In columns - 6,000 f t 3

(cement) 4 - 1,000 f t 3 tanks on deck - 4.000 f t 3

(cement) . Total 24,000 f t 3

23. Too (2) mud surge tanks • 70 cu. f t . capacity each, mounted above mud hoppers. One (1) cement surge tank - 80 cu. f t . capacity.

24. Oat (1) cemmntlng standplpe (15,000 ps1 MP).

25. Oat ( I ) PVT recording device lm each mud pit pies mud return Indi­cator.

26. One (1) s i r cond1t1oned/neated ead logging facility OS ta Integral part of the mud retum trot with geologist office ead mud engineers

- 6 -

»• *u coirfBOL km SUBSEA mimm 1. On (1) 18-3/4" x 18,000 Ml MP suosea BOP stack consisting of

OM (1) 18-3/4- Caueron MC Colltt ISM wellhead contactor. Two (2) each 18-3/4-, ISM Caneron T/pa T doublt rai preventers witn a flanges. AX flanged out lots, weduelocks. all ring grooves stainless stool 11 nod. Ono (1) 18-3/4", ION Csnaron Typo 0 annular BOP.

Foar (4) aacn 3-1/16". 18M Cantron douolt cavity gata valvts with substa failsafe operators (one dual cavity valve below each raa). Ono (1) 18-3/4", IBM Cantron riser as at re l . Guide frent for BOP stack Five (S) tots of root ts foi lout:

1 set blind/shtar. 3 tots 8" pipe. 1 set 3-1/2- plot' 2 tots 3-1/2" to 8" variable bore rats.

Ota (1) test/storage stuap for BOP stack, Csnaron 18-3/4" a ISM.

2. Ont (1) 18-3/4- lower earlee riser package (UP) consisting tf:

Ont 1 One 1 One 1 Two 2 One 1 Two 2

18-3/4", ION Cantron Typt 0 annular BOP. Caaa rot flea joint with riser adapter, each Coflexlp ball Joint flex hoses, each Coflexlp Mil Joint hydraulic Note, each choke ant ki l l Isolation valves.

Guide front for LRP. One (1) test/storage steep for LRP, C1M 18-3/4" x IBM.

3. Oat (1) Hughe* Offshore guideline re-establishing systan.

4. Oat (1) r ina ran Emergency BOP recovery systan.

5. Marina Hoar Joints consisting of 21" 00 x 11/18" wall 1-80 RF riser In following lengths: /ifrt *-L

35 ta . - SO' with syntactic foea buoyancy 28 Ot. - 50*

1 ea. - 45' 1 OO. - 40'

I oe.. ar l OA, - 10'

TM above equipped with two (2) each 3* 10, 15.000 ps1 MP choke/ k i l l 11 not tad OM (1) 2-1/2" 10 BOP hydraulic fine aad one (1) 4" I I end circulating (booster) Una.

6. Ont (1) set handling and test taols for Caneron RF riser.

7. Oat (1) 21" a SO' strtkt, silo joint, Cameron RF complete with Regan Type) SOL support ring.

b. Tut (2) 3" 10 x 56* long bill and choke line droop hoses *1tn stainless steel outer wrap/15.000 ps1 ur.

9. Oat (1) 30* Caswjron pin connector (to be used with spare Ceeeron flex joint and riser adapter) complete with two era guide frame, five function ho«« reel, suosea control hose and necessary valvi ng for Its operation.

10. Out (1) diverter system consisting of three (3) each 12" knife gate valves with hydraulic operators end one (1) Regan KfOS diverter assembly, nominal 24" for 49-1/2" rotary taole with support housing ant running/handling tool.

11. Ont (1) portable 20M hydraulic tost pump with chart recorder.

12. One (1) Cameron 3-1/11" and 2-1/14". ISM choke manifold consisting ef:

Two «*) 3" remote adjustable chokes. Two (2) 2" manual adjustable chokes. Two (2) buffer teaks. One (1) cnoke control penal (dual control). Five (5) hydraulic valve operators tn critical valves. One (1) hydraulic valve control panel.

13. One (1) 100 ant diverter control system (fully redundant) con­sisting of:

hydraulic pump units - 3.000 ps1 a1r/e1 metric with 600 gallon reservoir, three (3) t1r driven pumps, two (2) electric driven pumps, master ROP and diverter control panel.

Accumulators - Sufficient accumulator capacity with both sur­faco and UP mounted accumulators to meet applicable regulatory

Two (2) 4,710' capacity air operated nose reels each with loo Volumetric expansion subsea BOP control nose (40 - 3/16" 10 pilot hoses ond 1 - 1" 10 supply hose tech) for rated water eeptn.

Goo (1) 2-1/2" IB a 54' Coflexlp BBS hydraulic droop lasso with stainless stool tutor wrap 3,000 ps1 UP. (Connects to Hiegrel BOP control supply 11 me attached to tho marine riser.)

Two (2) each - subsea BOP control tods with guide arms end footle receptacles.

- B -

One (1) each - Driller's control pent) with controls for i l l BOP and diverter functions Including back-up battery power.

One (1) each - renote n1n1-panel.

One (1) 100 BBL glycol tank for antifreeze protection.

U . One (1) BL Shaffer 1,280.000 lb. riser tensioning system consisting of eight (8) each 180,000 i n . , SO' travel chain tensloners. Syttea Incites control panel, pressure vessels, air comprsisors/dryor units end Idler sheaves.

15. One (1) NL Shaffer guideline end podUno tensioning system consis­ting of six (4) each 16,000 lb. 40' travel wireline tenslonors. System Includes control panel, pressure vessels and Idler sheaves.

14. One (1) Honeywell RS-902 acoustic hole position Indicator system.

• 7. One (1) subsea TV system complete with camera assembly, lamp assem­bly, pan and t1H and telescoping frases.

WILL STUBS m HSJBXIBG TOOLS

1. Drill pipe 15,000 ft . to suit customer's requirements.

Standard Equipment:

10,000' Of 5" 00, 18.50 lb . / f t . , Grjdj_G. Range 2, 6-1/2" 00 -x 3-3/4" 10, 5" X-hole tool joints, boxes 2" US, fine particle na rename.

5,000' of 5" 00, 19.50 Ib . / f t . . Grade S-135, Ranee 2, 4-1/2" 00 x 3-1/2' 10, 5" X-hole tool joints. ~

40 eech, 8" 00 "Nevlwete" dri l l pipe. Ranee 2, 4-1/2" IF tool joints. — —

Two U ) each 5'/10715' dr i l l pipe pup joints. Grade SIM. 4-1/2" If tool joints.

2. Drill Oollors:

12 - 9-1/2" 00 a 2-13/16" 10 x 31' 6" long, 7-5/8" API Reg. connections, slip and elevator roots.

30 - 8" 00 x 3" 10 x 31'6" long. 4-8/8" API Reg. connections, slip and elevator recess, 7" hardbandlng.

30 - 4-1/2- 00 x 2-3/4" ID s 3 1 V loos, 4-1/2* If connections, slip end elevator recess, spiral grooving. 7" hwrMsaeiag.

3. Two (2) x &4' square kelly witn scabbard.

4. Two (2) sets l i t subs for standard bit sizes.

4. Two (2) sets crossover subs for Contractor furnished drill string and down hole tools.

4. Four (4) Kelly sever subs (with rubbers/throw-away type).

7. Six (4) each dri l l collar l i f t subs for 8" and 6-1/2" drill col­lars and two (2) each for 9-1/2" dr i l l collars.

• • Test sub for belly valve end choke eonlfold.

9. Two (2) TM - safety joint, 4-1/2* 00 with 4-1/2" IF box end pie, 3-1/2" 10.

10. Two (2). 6ray-1ns1de BOP, 4-1/2" 00 with 4-1/2" IF box and pin.

11. Two (2) each, I TAB upper end lower kelly vel ves, 15,000 psi UP.

12. Oes (1) Chlcksan, 4,000 psi circulating head 4-1/2" IF pin down/4" Ml I plug on top.

13. Two (2) Eastco Drift Indicators (non-di recti onal) complete with 1-5/8" OD protective barrel and accessories Including 0O-4O end Od-120 angle units.

14. Fishing tools consisting of:

Taper tap* end overshots Including accessories to catch contractor furnished dr i l l pipe aM dril l col lars.

15. Two J Typo "80" center letch elevators (350 ton) for 5" 00 dri l l ptM.

14. Two (2) eacn. PJ Type SLA center latch elevators (100 ton) for 0" 00 and 4-1/2" 00 drill collars. Two (2) eacn BJ Type Six side door elevators (100 ton) for 9-1/2" dr i l l collars.

17. OM (1) each, BJ Type SJ, single joint casing pick up elevators for 20", 13-3/8". 9-5/8", 7-5/8" and 7" TIC casing.

28. TM (2). BW Type SI side door elevators for 30", 20", 13-3/0", 9-8/0" end 7 s casing.

24. One (1) set Varco 500 too Type "SL-14" slip type comb 1 notion elevetor/spider omits with slips for 13-3/8". 9-5/8* oM 7" casing.

27. Three (3)- dr i l l p1pe/dr1ll collar eMail tongs (OJ Type SOO or equivalent) with lug jaws for pipe sizes 4" - 17".

10

21. Two (2) 20* casing manual tongs.

29. Ont (1) mOttherford Lamb Monti 16,000 hydraulic power tongs for running 11-3/0*, 9-5/8" tnd 7* casino sizes complete -1th ons (1) weatherford Lono/Skld noun tod hydraulic power unit.

3U. Ono (1) OrUco EZY-TORQ, Typt 1 complete with separate power unit.

31. Ono (1) t r i l l pipe spinner, weatherford Lano Splnnerhawk, Ms tti 13,000 J-29 tt hand la plan s i n s 2-7/8* - 7*.

32. Ont (1) kelly splnntr. International Tool Co. Inc. Modal A6C-2 with 6-8/0* L.H API lag. tool Joints, box up/pit down.

33. Slips consisting of:

t) Two (2) sets Varco Typo SOIL for 5" dril l plpt. 0) Tno (2) sots Varco for 6-1/2", 8* and 9-1/2" dril l collars. c) Tats (2) sots Varco Typo CM5-XL for 20* casing for ust with

Varco Typt CB 20" casing bushing. d) Ono (1) power slips, BJ Typo MBS. e) One (1) tot Varco node! PS-16 t i r sl ips.

34. One (1) set each BJ 3-1/2* a 144* (800 ton) ant 2-3/4* a 132" (380 ton) elevator lints. ^ i f? 1 % \ *•>'*>

35. Ono (1) each Baash Boss^Typt "C" safety clamps for 6-1/2*. 0" and 9-1/2" dri l l collars.

38. Ono (1) etch t it breaker for 24", 17-1/2*, 12-1/4* and 8-1/2* standard olt sites.

37. Ono (1) ond saver bucket, OTECO *Msd Guard".

38. Ono (1) BJ Hughes lower pipe racker ana and carries* assembly with racktr heads capable of handling 3-1/2" ant 6" drill pipe.

39. Two hundred (200) tech dri l l pipe casing protector rubbers for Contractor furnished 6" ft d r i l l pipe.

. hMUJ/tW UMimMI

1. Throe (3) heavy 11 ft leg capacity notional Model 05-435 hydrtullc pedestel crones each with 120* boom. Bated capacity each • 32,500 IBs. tt 120' maximum radius.

- 47,800 IBs. at 80' radius - 77,600 IBs. tt 60' radius - 187 JOO IBS. tt erlnlmum 30' radius

Whip H O B maximum load (tt t i l rad11) - 16,800 lbs.

- II

2. Out (1) riser pipe end citing handling system consisting of ono (1) S i ' soon bridge crane with two (2) lb ton hydrtullc hoists tnd cor­responding carts.

3. BOP handling system* consisting of ont (1) Nor-Har 2j0 ton single piece BOP carrier (enables handling and tatting of BOP/LRP as seed) ly In on* piece) tad auxiliary 200 ton overhead crane.

4. Six (•) Mertslle Vase 6*32 6 cylinder diesel ea1n engines each rated et 3,020 continuous BMP at 720 rpn, and each powering one (1) 2.500 KM alternator.

OC power for rig service provided through a AC switchboard and Gen­eral Electric SCR drive system. (3,500 AMP SCR bridges).

5. One (1) auxiliary Cunnlns diesel, Model KTA-50 powering one (1) 900 KM alternator.

B. Three (3) mineral Service rig e1r compressors, each 650 CFM et 125 ps1 complete with air drying system to - 40«c POP.

7. Two (2) cold start air compressors (1 diesel driven and 1 electric driven).

B. Two (2) bulk t i r compressors, each 600 CFM at 40 psi complete with refrigerated dryers.

9. Two (2) Rirex potable wcter distillation units with total rtttd capacity of 20,000 GPD.

10. Electric netting and air conditioning system In all living quarters end offices of Drilling unit.

11. Pollution control equipment consisting of one (1) sewage treatment pi ent, one (1) oil/water separator and two (2) portable waste oil dispose I tanks to meet 1M0/M, -pel regulations.

12. Four (4) personnel elevators 1n columns for access to pump and pro­pulsion rocas eni ont (1) personnel elevator on dril l floor to racking board and crown block.

13. maiding equipment consisting of two (2) 300 tap AC rectifier units tnd pat (1) 400 asp diesel drlvtn unit.

14. Radio communications and navigation equipment to matt U. S. Coast Guard tnd SOLAS requirements Including:

Rf Harris RF-230 SSB radio ISO M RF Morris RF-230 SSI radio 1000 M Collins a1/craft radio Alien Marinette IV weather fox Southern Avolnlcs Radio Beacon SSBOOA

- 12 -

Scientific Atlantic COMSAT unit i n Mackay MRU/30 complete ships station i n Mackay EPIRB i n Mackay Modal 401 Liftboat Radios Motorola 55/76 YMF radios - (tight (8) ttch for ust In cranas

and for novas tnd anchor handling).

18. Ont (1) computtrlzed rig nonltorlng systan consisting of a distrib­uted data col taction systan connected tn a multitask host computer with terminals (displays) 1n toolpusher i office, ballast control root end machinery house. Date collected and displayed at the ter­minal locations Includes engine room deta, dril l floor data, tank storage data, tnvl ronmental data and rig motion.

16. One (1) doted circuit switch able TV monitoring system with moni­tors located 1n toolpusher's office, operator's office, pilot house, dr i l l floor and other key areas. Cameras are located to view helideck, cellar deck, port/starboard supply vessel loading •*.at1onf as well n% subset opt rations.

17. Firefighting tnd Hftsevlng equipment to meet ABS and U. S. Coast Guard requirements Including:

Two hundred four (204) etch personnel survival suits. Four (4) watercraft covervd lifeboats, »8-enn, each.

18. '** Mawljir helicopter refueling station consisting of pump1i.j Mter separator and ont (1) fixed 2,000 gal. fuel

IB. Two '.2) Brit ish tope "Viking" boot mooring systems - ono (1) each for tort end starboard supply boat loading stations.

20. \M (»•) nor. Test Burner Booms, 76' long of triangular tusker design '.orated approxleatoly 48' above sea level at '.no 80' oper-at.ng t r t f t . Booms are complete wlt:i necessary o i l , gas and ut i l ­ity l ines, but without burners, turners W be provided by Opere-

21. One (1) troth compactor complete with disposal bags.

22. Ons (1) forklift , diesel powered, for handling palletized and other to U r i e l .

23. I lei ted HyS detection and perunnel protection equipment consisting of:

t) One (1) MRS gts detection ted alarm system with fixed sensors In ballast control room, dri l l floor, upper deck t i r conditioning tir Intake, mud return aroa (2), collar deck tret (2) , mud pump room end ( H root. System complete with required warning horns and . . .atlng red/yellow lights.

- 13 -

b) Twenty-five (25) - #9838-20 Survlvair, 30 uin. breathing device (Pressure Denand) Six (8) - spare 30«1n. Survlvair bottles (Pressure Oenand) Ow hundred five (108) - S oin. Survlvair escape packs Tue Ive (12) - 5 e1n. Survlvair recharge kits One hundred five (108) - Delear personal HZS detection saeplers One (1) - Honltox 5-peck with gas generator and spare parts Tne (2) - 701 TAC portable M2S portable detectors Two (2) - Oxygen resuscHetors, dual patient type

c 0 e f

n 1

(Note: Aoove HjS detection and protection equipment sufficient for closing 1n well end for personnel evacuation only.)

TMItO PAmTT EOt)IPST£WT

1. One (1) Halliburton twin HT-400 diesel cenentlng unit with 3.17 cu. N (20 Tta.) tanks, driven by two (2) ON 8V-71 engines with recirculating nlxer. Fluid ends rated at 18,000 ps1 MP.

2. batch n1x tank - 100 181 capacity complete with electric agitators, and electric punps to feed HT-400.

3. Liquid Additive Systen: - Four (4) liquid additive punps and holding tanks. Tank capacities ere: one (1) 1,500 gal. tenk. two (2) 750 ga l . , and one (1) 500 gal. tank.

14

CHEVRON USA, WC EASTERN REGION

CENTRAL DIVISION

Critical Operations and Curuilmont Plan

2. Upon

frilling in Cjoto rYoKimitv to Producino Weils - Ono outlined in Chevron* MuitipAt Operations Guidourwn.

cement, or BOP ciooure, if pn liable, when ninmrj to novo rig off in

*• Testing of Btowout Preventor. - Drilling opnrttiom will not procnod until tune tt tht blowout preventor stack hot boon in accordance, with Swc. 3.7 of OCS Order #2.

3. WnU Kickt - After experiencing t wnil kick, drilling oporttiorn rhtil continued until such time tt tho wellbore is stable, toi tiy overbtdnnc prtparIf ciwtTtlinid, an accoi donee wtth Chovtvjivt USCS appr n» id "Wnil

wnontinti Canine -it to bn carefully monitofoo our inf tho lent trip in the host with

drill pipe prior to running* casing, b) Tho BBPJ woitpn: shell bo datornuned to Bo aootusii to control formation

pressures in hoin which is to bo caned ofi. CJ The well will b-. checked for nnrnujl host fllesp and used dasplaciment on

trip out of hoin with tondBnoPJBBI aaanmbly, too whist toon* in host with

d) Flow line returns will be monitored while e) Ha casing string ttkke be lorn ranching

freed, pUns axe to cement it in piece, tnd notify proper USCS

V

Critical Operations -2-aad Curta l̂fTvant Plan

7. Nippliiaj Up and Nipping, Down Blowout . r^rTf lgg - BOPs will not bn down units* well ia dncrnnd to bo in a salt condition. Salary oi personnel ia nf rugh-wt priority durinf nlpplt up and nipple dawn oporat ions, and una of lilt lockets, saiaty linns or rent, and adequate pick-up Unna by cantrtctor will ba strongly

Minimum Mud Roouiremonts at Well Site - Drilling will not minimum amounts of mud mntoriais or bar itn fail bedew minimum

on drilling program submitted with permit to drilL wUl Be kept on location an

Loeaine and Wireline Operationa - Tho mud weight shell ms. The wi exiy exposwa xormetions. ine weu wm oe morutoreo sor now

tad kept full et all timet.

10. Hurricane Approach • Enweancy procudurea are provided for end evacuation of pertorsnei in sta

11. Criticei Wtidfre^and "kjrnine Qperrtiona - Critical

storm or hurricane situations.

• Onprntiona - Critical w conducted as outlined in Chevron's "Multiple Op aft tions

12. DrlU Stem Testing and Production Totting - Drill stern testing aad production tenting will be performed in accordance eith Chevron's "Multiple " Cuidaaaitt".

13. BgfTaTano1 Wt i f N & H U B f - The vnaU vn^ be plugged ind with PCS OreW #3. P i u t ^ wtU not commence if the

control. Blowout prevention equipment will not be remove peocornont of surface pnua. The OCS orOers will be followed during the cutting end removal of casing and clearing tha location.

l t . Person In Chtrta - The parson in charge at the site of all drilling operations tor which Chevron ia will be the Chevron operetor representative. The immediate suptrvlaor of the operator r apr aton tativo will be the Division Driliing Stasos intandom, sir. L. c . iiahlo The Division Drilling Superintendent, er his aaaJiBiujiari alternate, will be available to advise on manors ctntOroing critical oparatiora er curtailment of drilling operationa.

3E /R3**

DRILLING FLUID COMPOSITION

Fresh Water, Bentonite. Barite. Chemicals Salt Water. Attaplugite Clay, Barite. Chemicals

Freeh Water and/or Salt Water May Be Used

CHEMICALS & ADDITIVES

Barite - Barium Sulfate Beatoaite - Sodium Montmorillonite Clay Attapulgite Clay I ime - Calcium Hydroxide Caustic Potash - Potassium Hydroxide Chrome Ligaosulfonate Lignite Bode Ash - Sodium Carbonate Sodium Bicarbonate Sodium Acid Pyrophospate (SAAP) Carboxy Metbvlcellulose (CMC) XCD - Xantas Gum Polymer PAC - Polyanionic Cellulose Com Svarca t*»*nonhTe> • '••<..".. Ccaco Coupler - Noa-Ior.k. Vetting Agent defoamer - Non-Ionic Surfactant c7«a?s Bead*

Caustic Soda - Sodium Hydroxide

LOST CIRCULATION MATERIALS

Mica Walnut Shells Cellophane Flakes Fiber

STUCK PIPE

Diesel Oil Pipe Las " W" - Blend of Surfactants, Emulsifiers A Wetting Agents Versa Wet - Surfactant Wetting Ageat Verse HRP - Clay Extender

AU liquid mud will be disposed of la compliance with EPA requirements

AIR miSSlQrTS RgPPRT

Introduction

Chevron U.S.A. Inc. plans to dr i l l ana (1) additional wall 1a Groan Canyon Block

l f l aroa off tat Louisiana coast approximately 75 olios froa nearest snore. Toe

well will be drilled with toe Ocean America or similar rig beginning August 15,

1990.

Too primary sources of air emissions om the rig are the engine? described below.

Model: wartslla Vasa 6R32 Size: 3020 HP Use: Pow*r Generation htxeoer of units: B Load: Varying

Fuel: Diesel

Fool consumption records show the rig burns approximately 3000 gallons of diesel

p*r day. FsiMloe ca'cul i»i « i are t . cn this fee1 rate.

Support Vteath and Aircraft

Mel 1 copters, crewooats, and support vessels will trevel to and from the rig for

project deration. The definition of •facility' in ?ert 250.2 (ZZ) exempt ves eels

not transporting production. Therefore, none of these vessels ere included <n

this roport.

Enlxslon Calculation Bates

Aver ope foal use per engine: • wartslla Vasa GR 32 0 3020 HP each Total HP • 18120

Total feel consumption per day • 3000 gallons diesel

Mtfi HP x 3000 gals/day - 500 gals/day/engine 18120 BP

Est Of rd Drilling Days: ±80 days

P2F934

m i s s i o n factors (frost AP-12. (jgojllitlflj ftf Air Pollutant tmUtiem Factors Table 222-1):

CrolKlyilBfi

After the dr i l l lag r ig I s moved off location, mo further omission of pollutants

m i l l occur. (Tht d r i l l i ng rig 1s a temporary fac i l i ty" according U t ha

def in i t ion In Part 250.2 ( f f f ) . ) Out to ava i lab i l i ty , a rig other them the one

stated may be substituted when tha operation bogles. However, any r ig used wi l l

be of similar design end will have similar amis:Ion character ist ics.

Substitution of another r ig i s not expected to result Im significantly different

nai ss ions.

I t 1s possible that the r ig stay be oe location for a greater or lesser number of

days than stated. Im amy case, ami ssions are not expected to exceed the

exemption amount based on distance to shor?.

Projected tmlsslers are less than the eni ss ion exemptions, there-ore, this

operation Is exempt from further regulatory review.

Pollutant ( i / lO* ga l . )

CO VOC

102.0 37.5

409.0 31.2 33.5

•2F934

FREQUENCY AND DURATION . OF EMISSIONS BY POLLUTANT

FOR Y E A R _ u » _

Pollutant Projected Emissions Frequency Distribution

Dura Pollutant Tgns/Yr Lbs/Day

Frequency Distribution

Dura

TSP ex. 100 • •

S 0 2 3.7

•

* t M Dots

NOx 50.2 . •

• H voc

• •

' 4 5 MJ 0

•

• * • .tdODofa

•

CO : i2.2 30*

•. •^ooto

O m 0 m Chtvren USX te.

PROJECTED EMISSIONS FROM E*CH SOURCE BY AIR FOauTANT FOR ,~

GREEN CANYON BLOCK , f i OCEAN AMERICA

AIR POLLUTANT (T/yr)

Source so? NOx CO TSP VOC

0.614 9.36 2.C4 0.69 0.75

0.624 9.36 2.04 0.67 0.75

0.624 9.30 2.04 *0.67 0.75

1 6.624 9.30 2-04 0.67 0.75

r 0.624 9.36 :.04 0.67 0,75

i 0.62s j 9.38 2.<k ".67 0.75

Totol front* j roriliry

3.7* 56.2 I2J 4.02 4.5

SUMMARY OF EXEMPTION CALCULATION INFORA\ATKDN

GREEN CANYON BLOCK |<,i Ov«m« « * C A . JA

Pollutant FonfRjIo D(mte) E n?E? S

TSP E'333D 7 i MBB 4.U Y«

S02 E*3X3D 75 2496 3.7 fm

NOx E-333D 75 2498 58.2 fm

VOC E=33.3jj 75 •

2498 4.5 fm

CO E*3400d •

00467 12.2 fm

»