In Reply Refer To: M 5231 December 17, 1990

Oryx Energy Coapany Attention: Mr. A. R. Norwood Poet Office ROB 1S01 Houston. Texae 77251-1501 „.».,••»•*

NOTES — KRAMER

Gentleaon:

aeferenee is made te the following plan received December 3, 1*90:

Type Plan - Initial Plan of Exploration Leaae - OCS-C 6726 Biock - 3?S Aree - Eugene Island Activities Propoeed - Wells A, B, and C

In seeordanee with 30 CPR 250.33, this plan Is hereby deemed subraitted snd is now be Ing considered for approval.

Tour control number is N-3937 snd should be referenced ln your communication and correspondence concerning this plan.

Sincerely,

(Orig. Sgd ) A. Donald Giroir

D. J. Bourgeois Regional Supervls r Pield Operationa

bee: Uase OCS-0 6726 POD Pile (MS 5032) [MB 5034 w/publlc info, eopy of tha plan I and accoap. info.

Wil Hanson: cck: 12/06/90: P0EC0M

O r y i U f f y r BSSS| leSSS Headiraw Fomt Partway PO l o i 1401 HovMon TX r m I I SOI TIS M5 MOB

ORYX

CeM€eeM

November 29, 1990

Hr. Daniel Bourgeois Regional Supervisor, Field Operations Minerals Management Service Gulf of Mexico. OCS Region Office 1201 Elmwood Park Boulevard New Orleans, LA 70123-2394

Re: Initial Plan of Exploration Eugene Island Block 378 OCS 6 6726

Gentl emen:

Enclosed are nine copies, 5 proprietary end 4 public informetion, on en initial Plan of Exploration for leaie OCS G 6726, Eugene Island Block 378, for your review and approval.

Sincerely,

dlfjuj ^%\v t^!if Alfred B. Norwood Conservation Manager

A8N:vak Enclosures

90605 - (1)

PUBLIC INFORMATION

PLAN OF EXPLORATION

OCS G 6726

EUGENE ISLAND, SOUTH ADDITION BLOCK 37B

ORYX ENERGY COMPANY

NOVEMBER 1990

Contact:

A. B. Norwood ORYX ENERGY COMPANY

P. 0. Box 1S01 Houston, Texas 77251-1501

(713) 985-2092

90603 - (1)

EUGENE ISLAND, SOUTH ADDITION BLOCK 378

OCS G 6726

TABLE OF CONTENTS

Description and Schtdule of Work

Location -Table of Well Locations -Bathymetry Map -Onshore Bast Support Fac i l i ty Oata -Vicinity Map -Transportation Routt Map

Geological and Geophysical Information -Shallow Hazards Rtport -Structure Mips -Arta Classification for H2S

Oil Spill Information -Contingency Plan -Oi l Spill Trajectory Ant lys is

Wtstts and Pollutants -Discharges

- L i s t of Mud Additives

Other -Lease Stipulations -Air Emission Data -Description of Dr i l l ing Rig -CZM consistency cert i f icat ion -Environmental Report

90603 - (2)

ORYX ENERGY COMPANY PLAN OF EXPLORATION

EUGENE ISLAND, SOUTH ADDITION BLOCK 378 OCS G 6726

This Exploration PUn has been prepared in accordance with 30 CFR 250.33 and Notice to Lessees Nos. 83-3 and 86-09.

DESCRIPTION ANQ SCHEDULE

This Block was leased 1n August, 1984. Geophysical activit ies have been conducted and the f i r s t exploratory well should begin as early as February 1, 1991 subject to the availabil i ty of a dril l ing r ig, ap­proval of this Exploration plan, and the required permit to d r i l l . The tentative drilling schedule for the second and subsequent wells will depend on the results of Well No. 1.

LOCATION

SURFACE AND BOTTOM WATER LOCATION HOLE LOCATION DEPTH

_: 378 A Sur 4130' FNL and 3825' FWL 313*

B Sur 4490' FSL and 4830' FWL 320*

C Sur 1775' FSL and 6825' FWL 328'

A Bathymetry Map Is attached showing the surface locations.

The primary onshore support base for these proposed development opera­tions will be Oryx's Sabine Pass, Texas onshore support base. This present (since 1973) offshore support terminal encompasses a total area of 4.25 acres and includes an office building with small Inside storage area; pipe and equipment storage yard, boat dock, and a large ware­house. Oryx will also ut i l ize our existing offshore embarkation terminal at Fourchon, Louisiana which consists of leased dock and office space from e major mud company. A vicinity map is attached.

Travel routes for boats wil l be from Sabine Pass, Texas then directly to the drilling surf see location. A map showing the travel routes Is attached.

Helicopters will use the most direct route feasible. Boat and hel i ­copter trips to the dr i l l ing location wi l l probably occur on a dally basis during dr i l l ing operations to transport personnel end/or sup­plies.

90603A - (1)

LOUISIANA GULF COAST INOEX M.M.S. O.C.S. LEASING AREAS

•AST AOOiTlM

0 v L r

INSTRUMENTATION; VICINITY MAP

TRISPONDER MAGNETOMETER SIDE SCAN SONAR 24 kHz ECHO SOUNDER 7.0 kHz SUB BOTTOM PROFILER HIGH RESOLUTION SEISMIC SYST£M (12 FOLD; 24 TRACE), 200 CU. IN MATER GUN

GENERAL NOTES:

X, i COORDINATES, IN FEET, ANO BEARINGS ARE BASED ON THE LOUISIANA STATE PLANE COORDINATE SYSTEM (LAMBERT), SOUTH ZONE.

SURVEY PERFORMED BY GULF OCEAN DURING JULY, 198S.

OCOPMYSICAL SURVEY

SURVEY LOCATION MAP

BLOCK STB EUGENE ISLANO AREA

SOUTN ADOPTION

BUN EXPLORATION ANO PROOUCTION COMPANY

GULP OCEAN • t a v K t t , HM.

MM -o • • • • • • • • - • i s

TSWA U C M . c~ A*V MS. SS. 1 | • » • ! »0 I

I I 1

U.S. COAST CUUO PaOPtRIT

I I l l l R O U l l

I i<"it'»g

rr—l J>..rt "•->-»• \ . . : : .MB

"•}•—; '~«oocY Mciuir ' -^ j • "— I 3

VICIHITY MAP

•ASC SITI |

> L 0 u / S

HOUXTOX

I I tO ) • I I s i

scut IN a m :

SHINE Pl« USE JIU

SUIKE PISS

lEFFf*"". C0WTT.TIX1S

GEOLOGICAL AND GEOPHYSICAL INFORMATION

Four copies of a shallow hazards survey for this block art enclosed.

The wells Msted above wil l test for the presence of hydrocarbons In the anomal-e; 1n the PI 1-2 Sand and the Lent 1c Zone. A Structure Map I s attached.

Several wells have been dril led In this area with no Indications of H2S 4nc1ud1ng a well on South Marsh Island Block 190; therefore, K Is recommended that this area be classif ied as a "zone where the abwice of H2S has been confirmed."

Oryx believes that the structure aap and well plat submitted with this plan to be exempt froa public disclosure. Oryx requests that the data and Information enclosed herewith be dispersed for use only by the United States Government.

OIL SPILL INFORMATION

Oryx will adhere to a l l applicable environmental standards of the EPA, MMS and U.S. Coast Guard. Oryx 1s a member of Clean Gulf Associates (CGA) and will u t i l i ze their equipment and the manpower and expertise of Peterson Maritime Services Inc. as well as other specialists in pollution control and c1e«i up as needed.

Existing oil spi l l cleanup equipment with beach protection and bird cleaning station are a l l within a few hours call in the event of a s p i l l . This equipment i s maintained on standby and in a ready state at CGA locations at Grand I s l e , Louisiana; Houma, Louisiana; Intra Coastal C i t y , Louisiana; Ca.-eron, Louisiana; Galveston, Texas and rockport, Texas.

A copy of Oryx's 311 Spi l l Alert Procedure for the Gulf of Mexico 1s on f i l e with the U. S. MMS offices In the Gulf of Mexico area. Oryx Intends to util ize Peterson Maritime Services, Inc. for cleanup opera­t ions should an oi l s p i l l occur.

Oryx's base of operations In case of an oil spil l is the emergency response center 1n our offices at Houston, Texas. Field personnel will be dispatched from tur base support f a c i l i t i e s at Fourchon, Louisiana and Sabine Pass, Texas.

OIL SPILL TRAJECTORY ANALYSIS

In the event a s p i l l occurs '. ~m this area Oryx has projected th" trajectory of a s p i l l uti l izing Information In the draft Environmental Impart Statement (EIS) for OCS Lease Sales 131/135/137.

The EIS contains oi l sp i l l trajectory simulations using seasonal sur­face currents coupled with wind data, adjusted every 3 hours for 30 days or until a target 1s contacted.

90603 - (4)

fr

Hypothetical spill trajectories were simulated for each of tht poten­tial launch sites tcross tht entire Gulf. These simulations presume 500 spills occurring in etch of tht four seasons of tht ytar. Tht results 1n tht EIS were presented as probabilities that an oil spill beginning from a particular launch site would contact a certain lend segment within 3, 10, or 30 days.

The trajectory analysis Indicates that there 1s a negligible chance that a spill originating from these leases will contact land within ten days (see table IV-17 pp IV 85). An oil spill originating from these leases will be closely monitored as It approaches land and the most likely land segments to be affected will be determined utilizing the most recent trajectory analysis. Environmentally sensitive areas which could be affected will be determined using the CGA maps Louisiana 5 and 6 contained In Section V, Volume II of the CGA manual. This manual also Includes containment/cleanup protection response modes for the sensitive areas.

Section VI, Volume II of the CGA Operations Manual depicts the protec­tion response modes that are applicable for oil spill cleanup opera­tions. Each response mode Is schematically represented to show optimum deployment and operation of the equipment In areas of environmental concern. Implementation of the suggested procedures assures the most effective jse of the equipment and will result In reduced adverse Impact of oil spills on the environment. Supervisory personnel have the option to modify the deployment and operation of equipment to more effectively respond to site-specific circumstances.

In the event of en oil sp111, e vessel would be dispatched from our base at Sabine Pass, TX to the Cameron, LA CGA location for oil spill clean up equipment. The response time would be 4 hours travel from Sabine Pass to Cameron, 2 hours load out of equipment, 16 hours to Eugene Island Block 378 and one half hour to be In operation. In the event a vessel was available at Fourchon, It would be dispatched to the Grand Isle, Louisiana CGA location for oil spill clean up equipment. The response times would be 1 hour travel from Fourchon to Grand Isle, 2 hours loadout of equipment, 14 hours to Eugene Island Block 378 and one half hour to be In operation. CGA personnel, Oryx supervisory personnel and contract clean up personnel would be at the Cameron site or Grand Isle site in less than 5 hours.

90603 - (5)

SHALLOW HAZARDS EVALUATION

Eugene Ialand Aran South Addition Block 378

Oryx Energy Conpany acquired a shallow hazard survey over Eugene Island Block ""8 in July, 1985. Remote sensing equipnent included a proton precession total f ield rnagnetometer, dual side scan sonar, 24 kHz echo sounder, and 7 kHz sub-bottom profi ler . Seismic data were collected with a high resolution DFS V seismic system and 200 cubic inch water gun energy source. Seismic data were collected 12 fold to 1.0 second at 1.0 m i l l i ­second sample rate using a 24 channel streamer. The data were used to examine the surface locations indicatec below for any potential dr i l l ing hazards.

A 4130 FNL 3825 FNL of Block 378 Water Depth 313'

B 4490 FSL 4830 FNL of Block 378 Water Depth 320'

C 1775 FSL 6825 FNL of Block 378 Water Depth 328*

Examination of the hazard data revealed no dr i l l i rrr hazards requiring relocation fron the above points.

J im H. Wilborn Manager of Geophysics Oryx Energy Coapany G u l f of Mexico East D i s t r i c t

1D60/9-7 - (1)

WASTES AND POLLUTANTS

Discharge Volumes (per \ Mil )

CSG SIZE

SETTING DEPTH

HOLE SIZE

cKOSION FACTOR

CUTTINGS VOLUME

FT»

DRLG MUD VOLUME

(BBL)

30" 300' Jetted OX 900 See water

20" 1000' 26" 30X 3,353 597

13 3/8" 3000* 17 1/2" 30* 4.340 773

9 5/8" 8000* 12 1/4" 40% 5,314 947

7 5/8" 10000' 8 1/2" 40X 1,024 182

TOTALS 14,931 1,902

DISCHARGE

Dri l l mud

Dri l l cuttings

Sewege

Doaestlc waste

Water distillation units

B.O.P. Solution

Cooling water

Ballast

Deck drainage

RATE/QUALITY

1000 bbl/hour

2,057 gpd

7,650 gpd

7,500 gpd

80,000 gpd

125 gpd

4,214,000 gpd

None

600 gpd

COMPOSITION

Dri l l nud & fresh water

Subsurface sediment

Treated waste

Shower, wash 4 galley water

Salt water

Nonpolluting soluble solution

Sea water

Sea Water

Fresh water

1KLATMENT DISPOSAL

None Overboard

None aboard

Aerobic Overboard digestion

None

None

None

None

None

Overboard

Overboard

Overboard

Overboard

Overboard

Oil/water Overboard sep.

90603 - (6)

DRILLING MUO MATERIALS DESCRIPTION TRADE NAMES

BAROID M-I MILPARK B a r I t t Baroid Magco Bar M1l-Bar Hematite Denslalx M11-Dense 1 1 m l t t Bar-Gain B e n t o n i t e Aquagel Magcogel Mil-Gel A t t a p u l g i t e Zenogel Gel S a l t Wtttr Gel Organic Polymer XC Polymer XC Polymer XC Polymer Sodium Carboxymethyl C e l l u l o s e Cel lex Magco CMC CMC Po ly Anionic Cel lu lose PAC-R Poly-Pec Drispec Pre-Gelat inlzed Starch Impeneex My-Lo-Jel M11sttrch Non-Fermenting Oranlc Polymer D e x t r l d Permastarch Ptnea-Lost L i g n i t e Carbonox Tannathln Llgco C t u s t l c l z e d Lignite CC-16 Caus t l -L lg Llgcon Polymer/Resin Blend Durenex Resinex Chemtrol-X Potassium Lignite K-Llg Chrome Lignosulfonate Q-Broxln Spersene Uni-Cal Chrome-Free L ignosu l fonate QB-I I Magco CF: Uni-Cal S . E . A . Detergent Con Det D-D Milchem DO Hydroxyethly Cel lu lose B a r v l s Ce l l os l ze WO-21 Ground Mica Mlcatex Magco Myca Milmica Welnut Shells Wall nut Nut Plug M11 Plug

SPECIALTY MUD PRODUCTS

DESCRIPTION TRADE NAME MANUFACTURER

Mineral Oil w/Surfactant Mineral Oi l w/Gllsonlte & Surftcttnts Dlatomaceous Earth Modified Tannin Polyvinyl Acetate-Mael1c Anhydride Co-Polymer Blended Lost Circulation Material Cel lulose Fiber Sodium Polyacrylate

Bltwlser

Dlesphalt/Spotty Dlacel M Desco

Ben-Ex Kw1k-Seal Blen-Fyber WB WL-100

Major Chemical Co.

Major Chemical Co. Drill ing Specialties Co. Drill ing Specialties Co.

Rotary Dri l l ing Services Rotary Dri l l ing Services Venture Chemical Co. Kelco Rotary

COMMERCIAL CHEMICALS

Sodium Chromate Sodium Hydroxide (Caustic soda) Sodium Carbonate (Soda ash) Sodium Bicarbonate Calcium Hydroxide (L1me) Sodium Chloride ( S a l t ) Potassium Chloride Calcium Chloride Aluminum Sttarate Graphite

90603 - (7)

, i •• in ••

Oryx will not dispose of well fluids containing free oil Into tha Gulf of Mexico. Any fluid containing free oi l wi l l ba brought to short for proper disposal. All solid wastts will be disposed of as per 30 CFR 250.40. Oryx's personnel will be Instructed 1n the techniques of equipnent maintenance and operation relative to pollution prevention, end pollution Inspections will be performed as per 30 CFR 250.40, 30 CFR 250.43 and EPA General NP0ES Permit GMG 280000.

90603 - (8)

OTHER INFORMATION

LEASE STIPULATIONS

Stipulation No. 1 - Protection of Archaeo'oglcal Resource*

A high resolution geophysical survey was conducted In July, 1985. Although this report does not Indicate the possibil ity of any s igni f i ­cant cul tural resources, Oryx agrees that If any s i te , structure or object of historical or archaeological significance should be discov­ered during any operation, the findings will be Immediately reported to tho Regional Director and every reasonable effort wil l be aade to preserve end protect the cultural resource from damage until the Re­gional Director has given direction as to Its preservation.

AIR QUALITY CALCULATIONS

An Air Quality Calculations report Is attached. The results of this report show thet the amount of emissions expected for this activity are below the exemption amount and that further review is not required 1n accordance with 30 CFR 250.45.

EXPLORATORY DRILLING RIG

The d r i l l i n g rig to be ut i l ized has not been contracted, however Oryx intends to use a seal-submersible or dr i l l ship, whichever is avai l ­able.

A description of the Discoverer 534 Is attached as a typical vessel to be used.

ENVIRONMENTAL INFORMATION

An environmental report 1s attached.

CZM CONSISTENCY CERTIFICATION

The CZM Consistency Certification 1s attached along with the Public Notice Statement.

90603 - (9)

AIR EMISSION CALCULATIONS RIQ: SONAT DISCOVERER 534 TYPE: DRILL SHIP

FUEL USAGE FUEL USED EQUIPMENT ENGINE RATING (fcVHPHR) HOURS RUN/DAY (GAL/DAY) DRILLING

PRINE MOVER EMD ND 20-E9 3600 0.396 24 4835.3 365 PRIME MOVER EMD MD 20-E9 3600 0.396 24 4835.3 365 PRIME MOVER EMD MD 20-E9 3600 0.396 24 4835.3 365 PRIME MOVER EMD MO 12-E8 1650 0. 42 24 2350.5 365 AUXILIARY CAT D398 825 0.385 1 44.9 365

TAV-12 0.0 365 0.0 365 0.0 365 0.0 365

TRANSPORTATION 1250.0 365 0.0 365 0.0 365 0.0 365

TOTAL 18151.11

(Note: only three of tlx pr1«* Movers will be used unless dynamic positioning 1s utl

TSP (TONS) SOx (TONS) NOx (TONS) HC (TONS) CQ (TONS)

29.56 27.53 413.86 33.09 90 01 29.56 27.53 413.86 33.09 90.01 29.56 27.53 413.86 33.09 90.01 14.37 13.38 201.18 16.09 43.75 0.27 0.26 3.84 0.31 0.84 0.00 0.00 0.00 0.00 0.00 0.00 C.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.64 7.12 106.99 8.55 23.27 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

110.98 103.36 1553 62 124.23 337.81

90609 - (1)

SUMMARY OF EXEMPTION CALCULATION INFORMATION

D (MILES) PROJECTED (FROM NEAREST M £11 EMISSIONS EMISSIONS

LLUTANT FORMULA LAND) (T / y r ) (T / v r i (-E1

TSP E - 33.30 88 2,930.4 110.98 YES SOx E « 33.30 88 2,930.4 103.36 YES NOx E - 33.30 88 2,930.4 1553.62 YES HC E * 33.30 88 2,930.4 124.23 YES CO E - 340002/3 88 68,278.2 337.81 YES

AIR EMISSION FACTORS OBTAINED FROM EPA-AP-42 APPENOIX C SUPPLEMENT 9

90609 - (2)

DISCOVERER 534 SELF-PROPELLED TURRET MOORED DRILLSHIP Rated Dri l l ing Depth: 20,000 teet

Principal Particulars Length Between

Perpendiculars 486 f t t l

length Overall 534 lett

Beam Overall 80 ( t t t

Hull Depth 32 feet

Drill, Drilling 24 ( t t t 9 inches

Drill t t Leadline 24 let! 9 inches

lightship Displacement ...13.850 long tons

Moon Pool 26 let ! cj i tmtttr

Propulsion Two (2) 15 tt. 6 in. die. centerline screws. 8.000 hp each

Calm Wtt t r Speed 12 knots

Regulatory Body Classification ABS ^ A l Dr i l l ing Unit •Ji AMS Dr i l l ing Unit tnd let Strengthened Class (1-A)

Certified by L loyd 's Register

Regulatory Body Approvals DEN Certificte of Fitness Depanment of Energy (U.K.) Inttrnationel ' .oadime Regulation Inttrnational Convent ion for Safety ol Life et Sea. 1960 (SOLAS) Irish Cenif icate of Safety tnd Fitness Suet and Panama Canal Tonnage Regulations U S. Coast Gua rd Regulations U.S. Public Heal th Service Regulation

Registry PaAama

» Owner

Oeep Ocean Dr i l l ing. Inc.

Capacities Variable Load Capacity ...7.600 long tons

Tubular Storage Two (2) pipe racks lorward: 72 tt. x 32 ft., two (2) pipe recks eft: 82 ft x 27 ft., two ( i ) casing holds a f t 37 tt. x 26 ft.

Bulk Mud Eight (8) tanks. 1.SOO cu. tt. each. 12.000 cu tt. total

Bulk Ctment Four (4) tanks. 1.200 cu. f t each. 4,800 cu. tt. total

Sack Materiel Approximately 2.2O0 sq. f

Liquid Mud Active: 1.800 bbls. Reserve: 2.400 bbls.

Dl ts t l Fut l Oil 13.200 bbls.

Drilling W t t t r 12.4C0 t o n

Potable Waltr 1.400 btjls.

Positioning and Mooring Mooring Systtm Eicht (8) h y d r t u l i c mccr ing

winchts. jCC.CCO I ts . line pull; 7.000 II. cf 2 in. ctSie; 1.4C0 It. Of 2'.» in. chain: one (1) 3O.CC0 Its. anchor per mooring line

Slatlenkeeplng System ...Complete Hontywt l l Automttic Stttion Kee/mg system (ASK) with RS-S position re'erenct. six (6) Bird-Jchnscn controllable pitch, vtrtical input, rignt-angle tnruster units. 2.5C0 hp each

Drilling Equipment Otrrlck Pyramid Dynamic derrick. <6 ft. i

54 tt. base x 170 tt. high. 1.220.C0O Its. GNC

Substructure Sonat Offshore Drilling etsign. 54 ft. x 46 tt. bast x 40 I:, high

Drawworks National 1625-DE powered t y two (2) GE 752 O.C. motors. 1V* in. drill line. 9/16 in. sandline. Eimagco 7838 auxiliary brake. Crcwn-O-Matic

Rotary National C-495 independent rctar/

Prime Movers Six (6) EMD MO 20E9. 25CO KW. 4160 volt. 3-phase diesel electric generators, end one (1) EMO MO 12E8-6. 1050 KW, 4160 vol t generator

Auxiliary Power One(1)Caterpillar0-398TAV-12. 550 K W . 600 volt A.C. 2-phase generator

Emergency Power One (1) Caterpillar 3304. SO KW 1207206 volt A.C. diesel electric generator set

Power Distribution Eight (8) QE2400 ampSCF. power units

Crown Block Pyramid, save" (7) 60 in. die. sheaves grooved for IV* in. wire line. 500-ton capacity

Traveling Block National. ••> (6) 60 m. dia. ineevet grooved Ier I H In. line. SCO-ten capacity

Nee* Byron Jackson. 5500 Dynaplea. 500-ton capacity

Operating Water Depth: Minimum: 150 feet Maximum: 3,000 feet

Swlvtl National P-650. 650-ton capacity

Mud Pumps Two (2) National 12P-160.1600 hp triplex pumps, each powered by GE 752 dual motors

Mud Mixing Pumps Four (4) 6 in. x 8 in. mud mixing pumps

Degasser V/ellco Series 52C0

Of tender One (1) Pioneer S3-12 Volume-master. 15C0 GPM. at 70 It. head

Desilter Two(2) Pionee'T16-4 Siltmasters. 800 GPM at 75 It. head each

Shale Shaker One ( I ) Brandt dual tandem, rated 1.600 GPM at 20/40 mesh, and 8C0 GPM with ob long 40/60 mesh screens

Centrifuge Pioneer. 18 in. x 26 i. decanting c tn ' r i l ug t . driven by explosion proof 20 hp electric motor

Gas Detect ion System ....One(1)H,SGasOetectionSystem. monitors located in mud pit area and pump room

Drill Pipe (API) 10.000 ft. of 5 in. O.D.. Grade "E~. Range 2. 19.50 lbs ./ft. drill pipe: 6H in. O.O. x 4'.* in . I.F. tool joints: 13.000 ft. of 5 in. O.D.. Grade "G" . Range 2. 19.50 IbtVtt. drill pipe: 6H In. O.O. x 4V% in. I.F. tool

joints

Motion Compensator OSI. 1.200.000 lbs. pinned capacity. 400.000 lbs. operating capacity. 20 ft. maximum stroke

Riser T tns loners Twelve (12) HSMC tension units each rated at 80.000 lbs., with 50 ft. stroke, with 60 in . sheaves

Guideline Tenetoners Four (4) KSMC tension units each rated et 20.000 lbs., with 40 ft. stroke

Pipe Handl ing System .. . .Byron Jeckson hydraulic auto­matic 3-arm pipe handling system consisting of upper, intermediate end tower recker arms

Subsea and Weil Control Equipment -H2S Service Riser Two (2) Regen type BT-4.18H In.

nom. telescopic joints. SO It. stroke. Regan type PCF-6; 18H in. 0 .0 . x .687 in. well

Diverter Syetern Regen KFOS with 14 in. outlets

Ball Joint One (1) Regan ball joint type CR-i . tO degree angle

Ram Preventers Two (2) Cameron type " IT c:uble 16V. in.. 10.CC0 psi w p.

Annular Preventers Two (2) Hydril GL. 16*; in.. 5 CCO psi w p.. two (2) Vetco H4. i£- . in.. 10.000 psi hydraulic conrar.cr

B.O.P. Control Systtm ...Koomey 362-MJ-2S air and t tctric powered

Television Hydro Procucts ur.ctrwt: i r pan and til: tett/ision

ChoKT end Kill System ...McEvoy. 1C.CC0 psi dual eseke and kill mamloie with f.tctvoy valves, two (2) manually tcr-stast* and two (2) remote ccm.-cittc chokes

B.O.P. Stack Storage Stored cn guidetrack system cn derrick fleer

Auxiliary Equipment Accommodations

Cranes

Helicopter Oeck

Navigation Equipment

Communication Equipment

.Air-cer.citicr.ad cuaners fer 162 persens. hcspital for 6 parser.*, galley and messrcom facilities

•Two (2) Bucyrus Erie MK-25 cranes. 35-tons at 20 ft. radius, with 80 I t teems: two (2) Eucyrus Erie MK-6C cranes. 4 / ions i t 25 f t radius. wi:n 120 ft. bccr.s

..90 ft. x 62 f t to accer.T^data Sikorsky S-61 htliccpttr.2.CC0gai. refueling system

..Complete high seas navigation equipment, environmental mcticn end moni i r ing system and data recoreing

Water Distillation Units

Lifesaving Equipment .

Firefighting equipment

..Radiotelegraph (SOLAS Static.-. System), main SSB radiotfesnont. marine VHF-FM radiott'tphont. ships dial telephone system, scune powered tetepnene. PJk. system

..Two (2) Nirex units rattc at 600 GPH each

..Two (2) each. 42 and 84-persor. diesel pewered Ufeooets: two [2, each. 25 and 15-person life raft : 215 lile jackets with whts:;e ar.c water activated ligma

. . .Fixed C C t l i re extinguishing system m eng> - e. peint. arc boiler room, portable lire extinguishers end hycrams throughout snip

PLAN VIEW

OUTBOARD PROFILE

DISCOVERER 534

WELL PRESSURE CONTROL EQUIPMENT

•

DISCOVERER 534

WELL PRESSURE CONTROL EQUIPMENT

DIVERTER AND FLOW LINE SYSTEM

Manufacturer

Type:

Housing I . D .

D i v e r t e r Six*

Pressure Rating

F lowl ine Die.

B e l l Joint Type

Kuhget Offshore

XFDS

47* (Nom 45V)

24" Noc

500 PSI

14" Noc

DP.-l

The following sketch shows the flow l ine arrangement.

I. X H t i i

BOP AND LMRP

S p e c i f i c a t i o n s :

* Rama:

' Annulan:

Brand

Prassura Rat ing

Size

Quantity

Brand

Prassura Rating

Size

Quantity

'Wellhead Connector:

Brand

Model

Site

Pressure Rating

Quantity

•Riser Connector:

Brand

Type

Model

fixe

Pressure Rating

Quantity

NL Shaffer SL Poslock

10,000 PSI

18-3/4" Double Ram

2 Each

NL Shaffer Spherical

SOOO PSI

11-2/4-

2 Each

Vetco

I - 4

I I - 3/4"

10,000 PSI

1 Each

Vetco

High Angle Release

K-4

H-3/<"

10,000 PSI

1 Each

BOP AND LMRP (Continued)

• F l e x Joint:

Brand Vetco

Size 18-3/4"

Quantity 1 Each

•Choke and K i l l Valves

Brand -McEvoy

Model EDO

Size 3-1/16"

W.P. 10,000 PSI

•Choke and K i l l Koses

Brand Coflexip

W.P. 10,000 PSI

•Control Pods

Brand Valvcon (Hydril)

Size 56 Line

Working from the bottom up, the BOP stack consist of the Vetco wellhead connector, a set of double ram BOPs containing 5" pipe rams in both c a v i t i e s , another set of double raa BOPs with 5" pipe

• in the lower cavity and blind shear rams in the upper cavity, a spher ica l BOP, and a, high angle release mandrel to match'the LM?.? connector. The LMRP consist of the high angle release connector, a spherical BOP, and a f lex joint with a riser adaptor.

The stack has a to ta l of 4 out lets , each with double valves. Ths lowest i s below the lowest ram. The next higher one i s below the second ram from bottom and the next one up i s balow the shear rams which are in the top ram cav i ty . The highest outlet i s below the spherical BOP which i s in the LMRP and may be used to bleed of a gas bubble trapped under that BOP.

The BOP guide frame i s guideline/guidelineless with retractable pods eo that i t can be used guidelineless wichcut damaging the pod stabs.

H2S CERTIFICATION

The D534 well control sys' *m was b u i l t in 1975 and a l l piping

f i t t i n g s etc. were i n compliance to NACE standards in effect at

t h a t time. A l l welding procedures and welders were qualified

to H2S standards.

The new BOP and r i s e r system comply with current NACE

spec i f icat ions .

CHOKE AND KILL MANIFOLD;

The choke manifold has two Swaco hydraulic chokes with

separate control panels and two Cameron manual chokes. The 10,000

PSI s ide has 17 Rockwell (McEvoy) Model F valves of 3-1/16" bore

and the 3,000 PSI side has 11 Rockwell valves of 4" bore.

Following is a schematic and parts l i s t of the choke and k i l l

manifold.

DISCOVERER 534 CHOKE & KILL MANIFOLD

SCHEMATIC

COASTAL ZONE CONSISTENCY CERTIFICATION

PUn of Exploration

Eugene Island Block 378

OCS-G-6726

Tht proposed activities described 1n detail 1n this P'.an comply with Louisiana's approved Coastal Management Prograsi and will be conducted In a stanner consistent with such Program.

Arrangements have been made with the State-Times In Baton Rouge, Louisi­ana to publish 'he notice of the proposed activities no later than De­cember 20, 1990. Additionally, arrangements have been made with the Kaplan Herald 1n VenallUon Parish, Franklin Banner In St. Mary Parish, and The Dally Comet In Lafourche Parish to publish a public notice >f the proposed activities no later than December 20, 1990,

Manager, Offshore Operations

90*507 - (1)

Public Notice of Federal Consistency Review of an Exploration Plan (POE) by the Coastal Management Division/Louisiana

Departaent of Natural Resources for the Plan's Consistency with the Louisiana Coastal Resources Programs

Oryx Energy Company P. 0. Box 1501 Houston, TX 77251

Eugene Ialand OCS-G-6726 Block 378 i ease offering date Aug 1, 1984

Proposed Plan of Exploration for the above area provides for the exploration for o i l and gaa. Exploration activities shal l Include dr i l l ing froa a semisubmersible rig and transport of dr i l l ing crews and equipnent by helicopter and/or cargo veaael froe) en onahore baae located at Fourchon, La. No ecologically sensitive species or habitats are expected to be located near or effected by these activitiea.

A copy of the plan described sbove Is available for Inspection at the Coastal Management Division Office located on the 10th floor of the State Land and Natural Resources Bldg., 625 North 4th Street, Baton Rouge, Louisiana. Office hours: 8:00 a.a. to 5:00 P.m., Monday through Friday. The public Is requested to submit comments to the Coastal Man­agement Division, Attention: OCS Plans, P. 0. Box 44487, Baton Rouge, Louisiana 70804-4487. Comments must be received within 15 days of the date of this notice or 15 days after the Coastal Management Division obtains a copy of the plan and I t Is available for public Inspection. This public notice is provided to meet the requirements of the NOAA Regulations on Federal Con**stency with approved Coastal Management Progrems.

Applicant:

Location:

Description:

90606 - (1)

ENVIRONMENTAL REPORT

PLAN OF EXPLORATION OCS 6 6726

EUGENE ISLAND, SOUTH ADDITION BLOCK 378

ORYX ENERGY COMPANY

NOVEMBER, 1990

Contact: A. B. Norwood Conservation Manager Oryx Energy Coaipany P.O. Box 1501 Houston, Texas 77251 Phone: 713/985-2092

TABLE OF CONTENTS

P«gt

Tltlt Page

Table of Contents

DESCRIPTION OF THE PROPOSED ACTION

DESCRIPTION OF THE AFFECTED ENVIRONMENT AND IMPACTS

Physical and Environmental Parame'trs

Commercial Fishing

Shipping

Small Craft Pleasure Boating, Sport Fishing, and Recreation

Cultural Resources

Ecologically Sensitive Areas

Existing Pipelines/Cables

Other Mineral Uses

Ocean Dumping Grounds

Endangered/Threatened Species

Socioeconomic Parameters

UNAVOIDABLE ADVERSE ENVIRONMENTAL EFFECTS OF THE PROPOSED ACTION

GUARANTEE

REFERENCES

1.0 DESCRIPTION OF THE PROPOSED ACTION

A "PUn of Exploration" for Eugene Island Block 378 (Oryx Energy Company, 1990) Is being submitted concurrently with this "Environmen­tal Report" by Oryx Energy Company. Please refer to that report for a description of the proposed exploration act iv i t ies for the referenced lease block. This report was prepared according to the guidelines contained In the Notice to Lessees 86-09.

Oryx Energy Compsny presently has support bases at Fourchon, Louisiana and Sabine Pass, Texas which wi l l be used for exploration ac t iv i t i es . These f a c i l i t i e s are described 1n the exploration plan. No new support fac i l i t i es or new workers sre anticipated as a result of the proposed activity.

Helicopters, work boats, and crew boats will be utilized for transporting personnel and supplies to the area from Sabine Pass, Texas and Fourchon, Louisiana. A helicopter will make one to two t r i p s dally during dr i l l ing operations. A crew boat or supply boat w i l l make one trip per day on an average. The route travelled will normally be direct from the base to the dr i l l ing site.

A contingency plan for preventing, reporting, and cleaning up s p i l l s of oil or waste materials Is presented 1n the Plan of Fxplora-tlon (Oryx Energy Company, 1990) 1n the section entitled "011 Spill Information". Additionally, Oryx Energy Company's 011 Spill Alert Procedure for the Gulf of Mexico Is on f i l e with the Minerals Manage­ment Service (M.M.S.) offices 1n the Gulf of Mexico area.

Calculations of air pollutant emissions are presented 1n the Plan of Exploration (Oryx Energy Company, 1990). A 11st of dr i l l ing mud materials to be uti l ized Is also presented In that report, along with the project vldnity map.

There will be no other new or unusual activity associated with the project.

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2.0 DESCRIPTION OF THE AFFECTED ENVIRONMENT ANO IMPACTS

A description of the effected environment in the area of Eugene Island, fjlock 378, fe presented In the "Final Regional Environmental Impact Statement, Gulf of Mexico" (U .S .D . I . , M.M.S., 1983). Please refer to that document where addit ional data for the project area 1s required. The fo l lowing sections contain a br ie f summary of the phys­i c a l , environmental, and socioeconomic parameters of the area.

2.1 Physical and Environmental Parameters

2.1.1 Commercl i l Fishing

Fisheries resources provide a viable Industry 1n the Gulf of Mexico, with a 1988 value of $612 m i l l i on (U.S.O. I . , 1990). The major f ishing ports near the lease block, are Dulac-Chauvln and Golden Meadow-Leevl l le, Louisiana. Menhaden, with landings of 1.4 b i l l i o n pounds, valued at $73 m i l l i o n , represents the most Important Gulf species 1n quantity landed during 1988. Shrimp wi th landings of 147 m i l l i on pounds, valued at $416 m i l l i on , represents the most Important Gulf species in terms of value in 1988. Other s ign i f icant Gulf commercial f isheries Include oysters, blue crabs and an assortment of f i n f i s h (U.S.D. I . , 1990).

Louisiana ranked f i r s t among the Gulf states In to ta l f ishery landings for 1988 wi th nearly 1.4 b i l l i o n pounds landed, valued at $316.5 mi l l ion. Louisiana landed 44 percent of the shrimp, 75 percent of the oysters, 80 percent of the menhaden and 68 percent of the blue crabs harvested from the Gulf In 1988. Shrimp and oysters are estuarine associated species and are centered on the mud and sand bottoms off the coast of Louisiana. Menhaden occur in the shallow waters, with abou ' 3 percent of t h i s f ish ing occurring w i th in 10 miles of shore. ,ene Island Block 378 is located approximately 88 miles from land. Due to th is distance, I t Is unl ikely that operations w i l l Interfere wi th commercial f ish ing.

2.1.2 Shipping

Gulf shipping 1s both Intercoastal and Internat ional , w i th barges end supertankers competing for harbor and r i ver space. In the open Gulf , ships have to compete with barges, f i sh ing vessels, o i l and gas platforms, supply boats, and recreational vessels; however, accidents are rare and safety fairways are well known. A more detai led descrip­t i o n of shipping 1n the area 1s presented 1n Section I I . C . I .E . , Transportation, pages 11-57 through 11-64, of the f ina l EIS fo r Lease Sale No. 51 (U .S .0 .1 . , 1978).

The poss ib i l i t y that a ship w i l l co l l i de with the f a c i l i t y Is ml i lmal, since the f a c i l i t y and associated ac t i v i t i e s w i l l be located outside of fairways and t rans i t lanes. Eugene Island Block 378 1s located approximately 10 miles from the nearest fairway (U.S.D.J. . M.M.S., 1983).

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2.1 .3 Small Craft Pleasure Besting, Sport Fishing, snd Recreation

The northern Gulf of Mexico coastal zone i s s major recreational area for saltwater f ishing, diving snd beech-oriented act iv i t ies . Shel l fishing and small boat pleasure boating are also major recrea­t ional activities. Boats 16 feet or greater are potentially capable of venturing offshore.

2 .1 .4 Culture! Resources

There are no known cultural resources In the area of the proposed s i t e and the potential for occurrence of cultural resources In the eree Is low. Lease stipulations do not require an archaeological survey to performed; however, a geophysical survey performed In J u l y , 1985 by Gulf Ocean Services, Inc. did not Indicate any anomalies In the area.

2. I .S Ecologically Sensitive Areas

The Gulf of Mexico coastal zone Includes publicly owned areas such as national seashores, parks, bee-che s, and wildlife lands, as well as specially designated preservation areas, such as historic and natural sites and landmarks, wilderness areas, wildlife sanctuaries, end scenic rivers. Activi t ies In the area of the proposed site are regulated by Louisiana's Coastal Zone Management Program. A more detailed description of parks and refuges in the Gulf area Is present­ed In the final EIS for Lease Sale No. 51, Section I I . C. I .E . (1); however, there are no parks or refuges 1n the vicinity of the proposed act iv i ty and the proposed activity Is not expected to affect such an aree.

Eugene Island Block 378 Is located approximately 88 miles from shore. Due to this distance, routine operations will not affect Loui­siana's sensitive coastal areas. It Is also unlikely that a blowout or oi l spill would occur which would reach these sensitive areas. In the event of a non-routine Incident, such as a blowout or an oi l s p i l l , priority will be given to protection of sensitive areas.

The hard bottom sress nearest Eugene Island Block 378 are Fishnet, Alderdlce and Jakkula which are located approximately 5, 10 and 11 miles, respectfully, from the Block, (U.S.D. I . , M.M.S., 1983). Routine operations are not likely to affect these banks. In the event of a blowout or oi l s p i l l , priorit • wi l l be given to protection of these banks.

Eugene Island Block 378 Is located In weter depths greater less than 400 a; there foi t, there Is negligible potential for chemosynethetlc organisms to be present.

2 .1.8 Existing Pipelines/Cables

There are no known pipelines within Eugene Island Block 378.

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2.1 .7 Other Mineral Uses

There are no known Mineral deposits of commercial Importance within the lease block and potential Is low for Impacts to mining a c t i v i t i e s occurring outside the lease block.

2 .1 .8 Ocean Dumping Grounds

There are no known ocean dumping sites In the area of the pro­posed site.

2 .1 .9 Endangered/Threatened Species

Several federally designated endangered species occur, either on a permanent or transitional basis, within the region of Eugene Island Block 378 (U.S.D.I., 1979). These species Include the sei , f in, blue, r ight , and sperm whales, which occur In the central and western Gulf of Mexico. The red wolf may be found along the Gulf coast 1n Chambers end Jefferson Counties, Texas, and Cameron and VermiHon Parishes, Louisiana. Additionally, populations of whooping cranes, bald eagles, brown pelicans, Attwater's prairie chickens, American al l igators, and Kemp's Ridley sea turtles are known to nest In the coastal areas of the western Gulf of Mexico.

The potential for Impact from this project on these endangered species Is low, since the proposed activity will take place approxi­mately 88 miles from shore. In the event of a non-routine Incident, such as a blowout or o i l s p i l l , priority wil l be given to the protec­tion of any endangered species In the area.

2.2 Socioeconomic Parameters

Economic activity 1n the Gulf coastal area 1s dependent upon I ts abundance of natural resources, Including oil and gas and support Industries, commercial fishing, and recreation and tourism. Major transportation systems, such as the Green River, are the basis for port activity, which 1s significant to local, regional, and national economies. A more detailed description of the socioeconomic environ­ment Is presented In Section I I I .C . of the final EIS for Lease Sales A66 and 66 (U.S.D. I . , 1980).

No expansion of the existing shore br s . faci l i ty Is expected as a result of the proposed act ivi t ies. Additionally, there wil l be no new employment as a result of the proposed act iv i t ies .

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3.0 UNAVOIDABLE ADVERSE ENVIRONMENTAL EFFECTS OF THE PROPOSED ACTION

Unavoidable adverse effects of tht proposed action will be mini­mal. They can be summarized es follows:

(1) the normal and routine act iv i t ies of oil and gas explo­ration and developeent operations will produce no significant long-term adverse environmental effects, although 1n a few Instances (pipeline construction, muds and cuttings disposal, e t c . ) , short-verm local adverse ef fects , such is an increase in air emissions and water turbidity during dr i l l ing operations, may result; and

(2) non-routine incidents, such as blowouts and oil s p i l l s , may produce significant and longer-term adverse ef­fects, depending on the location and size of the Inci ­dent, but the likelihood of such an Incident occurring In or near an area where the effects would be s igni f i ­cant ( In shallow water, near a shore. In wetland, etc.) Is stat ist ica l ly very small.

The proposed project will help to meet current energy demands without continued dependence on foreign Imports. Because 1t wil l contribute significant beneficial energy needs and economic gains for the United States, with only h negligible adverse effect on the envi­ronment, Oryx Energy Company believes the project Is just i f ied and should be approved as proposed.

4.0 GUARANTEE

The proposed act iv i ty will be carried out and completed with the guerentee of the following Items:

(1) the best available and safest technologies will be util ized throughout the project. This includes meet­ing a l l applicable requirements for equipment types, general project layout, safety systems, snd equipment and monitoring systems;

(2) s i l operations will be covered by a M.M.S. approved oi l spil l contingency plan; and

(3) al l applicable Federal, State, and local requirements regarding e1r emissions and water quality and d is ­charge for tho proposed ac t iv i t ies , as well es sny other permit conditions, wi l l be compiled with.

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5.0 REFERENCES

Lelpper, 0. F. 1954, Physical oceanography of the Gulf of Mexico. In : Gulf of Mexico, I t s o r i g i n , waters and Marine l i f e . P. S. Galtsoff (ed . ) . Fishery Bu l le t in 89. Fish and Wi ld l i f e Service, U. S. Oept. of the I n t . , Washington, D.C. 55: 199-138.

MTS 1<>90 A Geophysical Survey Report, South Timbalier area, Block 240, Offshore Louisiana, 0C5-G-10839.

ORYX ENERGY COMPANY, 1990. Plan of Exploration, Eugene Island Block 378, November, 1990.

U.S. Departnent of I n t e r i o r , Bureau of Land Management (U.S.D. I . ) . 1978. Proposed 1978 outer continental shelf o i l and gas lease sale, of fshore western and central Gulf of Mexico, OCS Sale #51, d r a f t environmental Impact statement. Wash­ington, D.C.

. 1979. Final environmental Impact statement; OCS Sale 58. Proposed 1979 OCS o i l and gas lease Sale 58: western and central Gulf of Mexico. 2 vols. Washington, D.C. vo l . 1.

. 1980. Final envlronMental iMpact stateMent; OCS o i l and gas proposed 1981 Sales A66 and 66, prepared by the New Orleans Outer Continental Shelf Of f ice , New Orleans, Louisiana.

. 1981. Final envlronMental iMpact statement; proposed OCS o i l and gas Sales 67 and 69; prepared by the New Orleans Outer Continental Shelf Of f ice , New Orleans, Louisiana.

• 1990. Draft environmental Impact statement; proposed OCS o i l and gas Sales 131, 135, and 137; prepared by the New Orleans Outer Continental Shelf O f f i ce , New Orleans, Loui­siana.

U.S. Department of the I n t e r i o r , Geological Survey. (U.S.G.S.). 1J80. Guidelines for preparing an outer continental shelf environ­mental report f o r coastal Manso^ment Consistency Determina­tion by the States of Alabama, Louisiana and Green, Washington, D.C.

U.S. Department of I n t e r i o r , Minerals Management Service (U.S.O. I . , M.M.S.). 1983. Final regional environmental Impact statements, Gulf of Mexico, volumes I and I I . Meta i r ie , Louisiana.

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