DATE

TO: OPS-3-4

FROM: FO-2 1

Unit Development Operations Coordination Document (DOCD) and Environmental Information Leases OCS-G 6957, 6958 and 6962, Control Ko. U-0666

NOTED - KRAMER

Office of Program Services

MAY 2 1990

Information Services Section

DOCUMENT TRANSMITTAL

TO: Minerals Management Service 1201 Elmwood Park Boulevard NewOrleans, Louisiana 70123-2394

Attention: Mr. Mike Tolbert

ffi " RECEIVED^ \% MAY 311990 d X&r FIEL.' J&i

v-.'o.. OPERATIONS

DATE: Apri l 30, 1990

PROJECT:AEDC (USA) Inc. Mississippi Canyon 487

Federal Unit (0-666)

GENTLEMEN:

( X) We are sending you the following document(s)

( ) V.'e are acknowledging receipt of the fol lowing document(s)

K ) NO.

:OPIES DESCRIPTION

9 Amended Page to I n i t i a l Development Operations Coordination

Document (Shallow Hazards Section)

9 Attachment G - Quantities and Rates of Discharges

1 Cooy of l e t t e r directed to Adnan Ahmed transmitt ing shallows

hazards data f o r proposed platform location s i t e .

These are sent for the purpose indicated below:

( x ) For Approval ( ) For Revision as Noted

( ) For Review and Conments ( )

( ) For Your F i l e and Use ( )

REMARKS:

il9ned connieti. Goers

J. CONNOR CONSULTING

HYDROGEN SULFIDE

AEDC recommends the area be classified as a zone where the absence of hydrogen sulfide has been confirmed. This request for classification is based on the drilling of OCS-G 6957, Well No. 1; where the presence of hydrogen sulfide was not encountered during the course of operations.

Therefore, in accordance with Title 30 CFR 250.67, AEDC (USA) Inc. hareby requests that a determination be made by MMS that the zones are in an area where the absence of hydrogen sulfide has been confirmed.

BATHYMETRY MAP

A bathymetry map showing the surface location of the rroposed structure is included as Attachment E.

SHALLOW HAZAROS

A site specific shallow hazards survey was conducted by Ocean Marine Geophysics Inc. on behalf of Arco Exploratior. Company and was submitted as part of the Initial Plan of Exploration for Mississippi Canyon Block 486 (OCS-G 6957). In addition to the hazard data obtained by Ocean Marine Geophysics, AEDC has reviewed more recent hazard data over the area completed by John E. Chance & Associates (proposed pipeline route). Both surveys reveal that there are no shallow hazards below the proposed platform location. AEDC has detprsmed from reviewing these data, that this surface location is suitaDle for platform installation.

OIL SPILL CONTINGENCY PLAN & RESPONSE TIME

All construction and production operations shall be performed in accordance with industry standards to prevent pollution of .he environment. AEDC (USA) Inc.'s Oil Spill Contingency Plan has been approved by the MMS. This plan designates an Emergency Pesponse Team consisting of AEDC personnel and contract personnel. This taan.'s duties are to eliminate the source of any s p i l l , remove all sources of possible ignition, deploy the most reliable means of available transportation to monitor the movement of a slick, and contain and remove the slick 1f possible.

AEDC i.s a member of Clean Gulf Associates (CGA). The CGA stores pollution control equipment at two locations in Texas, at Rockport and Galveston; and five locations in Louisiana, at Venice, Grand Isle, Intracoastal City, Houma and Cameron.

Each location is equipped with fast response skimmers and there is a barge mounted high volume open sea skimmer based at Grand Isle, Louisiana. In addition to providing equipment, the CGA also supplies advisors for clean-up operations. Equipment available from CGA and thf: base i t is located at is listed in the CGA Manual, Volume [, Section I I I .

AEDC (USA) INC.

INITIAL DEVELOPMENT OPERATIONS COORDINATION DOCUMENT

MISSISSIPPI CANYON 487 UNIT

UNIT AGREEMENT NO. 754389006

QUANTITIES AND RATES OF DISCHARGES

WILL HOLE SIZE DEPTH DISCHARGE VOLUME (BBLS) MAX. DISCHARGE

AA 26" 1800' 1420 MAX. 1000 BPH

22" 3900' 1185 MAX. 1000 BPH

14-3/4" 5500' 410 MAX. 1000 BPH

7-5/8" 11104' 380 MAX. 1000 BPH

BB 26" 1800' 1420 MAX. 1000 BPH

22" 3900' 1185 MAX. 1000 BPH

14-3/4" 5500' 410 MAX. 1000 BPH

7-5/8" 14287' 600 MAX. 1000 BPH

CC 26" 1800' 1420 MAX. 1000 BPH

22" 3900' 1185 MAX. 1000 BPH

14-3/4" 5500' 410 MAX. 1000 BPH

7-5/8" 12409' 470 MAX. 1000 BPH

DD 26" 1800' 1420 MAX. 1000 BPH

22" 3900' 1185 MAX. 1000 BPH

14-3/4" 5500' 410 MAX. 1000 BPH

7-5/8" 13173' 520 MAX. 1000 BPH

ATTACHMENT G

AEDC (USA) INC. TELEPHONE: (713)660-8141

1212 5IAIN. SUITE 942 FAX. (713)654-7712 HOUSTON. TEXAS 77002

Mr. Daniel J . Bourgeois

April 10, 1990

Regional Supervisor ^^===r^-==^^ Off ice o f Field Operations U.S. Department of the In te r io r Minerals Management Service 1201 Elmwood Park Boulevard New Orleans, LA 70123-2394

RE: I n i t i a l Development Operations Coordination Document Miss iss ippi Canyon 487 Federal Unit Agreement No. 754389006 OCS Federal Waters, Gulf of Mexico, Offshore, Louisiana

Gentlemen:

In accordance with the provisions of T i t l e 30 CFR 250.34, AEDC (USA) Inc. (AEDC) hereby submits for your review and approval nine (9) copies of an I n i t i a l Development Operations Coordination Document for Mississippi Canyon 487 Federal Unit, (Unit Agreement No. 754389006), Offshore, l ou is iana . Five (5) copies are "Proprietary Information" and four (4) copies are "Public Information".

Excluded from the Public Information copies are certain geologic d iscussions, depth of wells and structure map.

AEDC ant ic ipates commencing ac t i v i t i es under th i s proposed I n i t i a l Development Operations Coordination Document approximately September, 1990.

Should you have any questions or requests for addit ional information, please contact our regulatory agent, Connie J . Goers, J . Connor Consult ing at (713) 558-0607.

S incere ly ,

AEDC (USA) Inc.

Hisayasu Tokunaga Executive Vice President

HT:CJG Enclosures

"Public Inforination

AEDC (USA) INC.

INITIAL DEVELOPMENT OPERATIONS COORDINATION DOCUMENT

MISSISSIPPI CANYON 487 FEDERAL UNIT

UNIT AGREEMENT NO. 754389006

AEDC (USA) Inc. (AEDC), as designated operator of the subject federal unit , hereby submits th is proposed I n i t i a l Development Operations Coordination Document in accordance with the regulations contained 1n T i t le 30 CFR 250.34 and more spec i f ica l ly defined in the Minerals Management Service Letters to Lessees and Operators dated October 12, 1988 and September 5, 1989.

BRIEF HISTORY TO DATE

By l e t t e r dated March 16, 1989, MMS approved the un i t i za t ion of leases OCS-G 6949, 6957, 6958, 6962 and 8825, Mississippi Canyon Blocks 443, 486, 487, 530 and 531 N/2, respect ively. Addi t ional ly, a suspension of production fo r the unit was approved through October 31, 1990, by which time development d r i l l i ng is scheduled to commence.

SCHEDULE. OF OPERATIONS

AEDC proposes to instal l a 12-slot d r i l l i n g and production platform in Mississippi Canyon Block 486 (OCS-G 6957). A total of four wells w i l l be d r i l l ed and produced from th is s t ructure, to be designated as Production Platform "A". A 12.750" r ight-of-way pipeline w i l l be Instal led to transport produced hydrocarbons, or ig inat ing at proposed Production Platform "A" In Mississippi Canyon Block 486 and terminating via subsea tie-1n wi th an existing pipeline located in Grand Is le Block 94.

No new nearshore or onshore pipel ines or f a c i l i t i e s w i l l be constructed. The spec i f ic system wi l l be determined during the negotiation of a gas marketing contract which w i l l take place prior to construction and i n s t i l l a t i o n of the pipeline.

A well l oca t ion table showing surface and bottom hole locations, total well depths and water depths of the subject wells 1s included as Attachment A.

Ac t i v i t i es under this I n i t i a l Development Operations Coordination Document f o r Mississippi Canyon 487 Unit w i l l commence in September, 1990 with the Ins ta l l a t i on of the proposed platforra. The fol lowing schedule detai ls the chronological order of the proposed events leading to f u l l start up o f production.

Activity Activity Schedule Estimated Start-UP

1. Commence Platfonn Installation September, 1990

2. Commence Drilling Four Wells October, 1990

3. Commence Pipeline Installation October, 1990

4. Commence Production August, 1991

DESCRIPTION OF DRILLING UNIT

The subject wells wil l De dr i l led and completed utilizing a typical self-contained platform dri l l ing r i g . Typical Diverter and BOP Schematics are included as Attachments B-l and B-2.

Safety features include well control and blowout prevention equipment as described in Subpart D of 30 CFR Part 250. The appropriate l i f e rafts, l i f e jackets, ring buoys, etc., as prescribed by the U. S. Coast Guard w i l l be maintained on the f a c i l i t y at all times.

DESCRIPTION OF Pt TFORM

AEDC proposes to install a 12-slot d r i l l ing and production manned platform at a surface location of 9740' FSL and 4620' FEL of Mississippi Canyon Block 485 (OCS-G 6957). A schematic of the proposed structure is included as Attachment C.

Any hydrocarbon handling equipment installed for testing and production operations, such as separators, tanks, and treaters shall be designed, installed and operated to prevent pollution from the proposed platforra.

Maintenance or repairs which are necessary to prevent pollution of offshore waters shall be undertaken immediately.

There shall be no disposal of equipment, cables, containers, or other materials Into offshore waters.

A current structure map drawn to the top of each prospective hydrocarbon accumulation showing the surface and bottom hole location of the subject wells Is Included as Attachment 0.

STRUCTURE MAP

The estimated Ufe of reserves for the Mississippi Canyon 487 Unit Area Is with expected In i t ia l production at MMCFD and

BCPD.

HYDROGEN SULFIDE

AEDC recommends the area be classified as a zone where the absence of hydrogen sulfide has been confirmed. This request for classification is based on the dr lling of OCS-G 6957, Well No. 1; where the presence of hydrogen sulfide was not encountered during the course of operations.

Therefore, In accordance with Title 30 CFR 250.67, AEDC (USA) Inc. hereby requests that a detennination be made by HMS that the zones are in an area where the absence of hydrogen sulfide has been confirmed.

BATHYMETRY MAP

A bathymrtry map showing the surface location of the proposed structure is included as Attachment E.

SHALLOW HAZARDS

A site specific shallow hazards analysis was completed and submitted as part of the Initial Plan of Exploration for Mississippi Canyon Block 486 (OCS-G 6957). The well previously drilled at this location verify no shallow gas hazards exist. Soil borings have been taken at the development location to properly design and size the production platform.

QIL SPILL CONTINGENCY PLAN a RESPONSE TIME

All construction and production operations shall be performed in accordance with industry standards to prevent pollution of the environment. AEDC (USA) Inc.'s Oil Spill Contingency Plan has been approved by the HHS. This plan designates an Emergency Response Team consisting of AEDC personnel and contract personnel. This team's duties are to eliminate the source of any spill, remove all sources of possible Ignition, deploy the most reliable means of available transportation to monitor the movement of a slick, and contain and remove the slick 1f possible.

AEDC 1s a member of Clean Gulf Associates (CGA). The CGA stores pollution control equipment at two locations 1n Texas, at Rockport and Galveston; and five locations in Louisiana, at Venice, Grand Isle, Intracoastal City, Houma and Cameron.

Each location is equipped with fast response skimmers and there 1s a barge mounted high volume open sea skimmer based at Grand Isle, Louisiana. In addition to providing equipment, the CGA also supplies advisors for clean-up operations. Equipment available from CGA and the base i t is located at is listed in the CGA Hanual, Volume I , Section I I I .

Estimated response time for a spill in tie Mississippi Canyon 487 Unit Area (Mississippi Canyon Block 486) could vary from 10 to 12 hours minimum based on:

HOURS

1. Procurement and travel time for marine vessel 1.5 Hours to transport pollution control equipment

2. Load out Fast Response Unit and oil spill 2.0 Hours containment equipment

3. Travel time to lease site 7.0 Hours

Estimated Total Time 10.5 Hours

Equipment located in Venice, Louisiana would be utilized f i r s t with additional equipment transported from the nearest equipment base as required.

In the event a spill occurs from the surface location in Mississippi Canyon Block 486, a projected trajectory of a spill has been done uti l i z i n g information in the Environmental Impact Statement (EIS) for OCS Lease Sales 123 and 125.

The EIS contains oil spill trajectory simulations using seasonal surface currents coupled with wind data, adjusted every 3 hours for 30 days or until a target is contacted. Hypothetical spill trajectories were simulated for each of the potential launch sites across the entire Gulf. These simulations presume 500 spills occurring each of the four seasons of the year. The results in the EIS were presented as probabilities that an o i l s p i l l beginning from a particular launch site would contact a certain land segment within 3, 10, or 30 days. Utilizing the summary of the trajectory analysis (for 10 cays) as presented on the summary on pages IV-36 through IV-39, the probable projected land f a l l of an oil spill 1s as follows. Also listed is the CGA Map Number corresponding to the land segment which w i l l be utilized to determine environmentally sensitive areas that may be affected by a s p i l l .

AREA LAND SEGMENT % CGA MAP NO.

Mississippi Lafourche Parish, LA 3% LA Map No. C Canyon 486 Jefferson Parish, LA 4% LA Maps No. 6 4 7

Plaquemines Parish, LA 41% LA Maps No. 6 & 7

If a s p i l l should occur from the proposed location, AEDC would Immediately activate its Emergency Response Team, determine from current conditions the probable location and time of land f a l l by contacting the National Oceanic and Atmospheric Administration's (NOAA) Gulf of Mexico Scientific Support Coordlnat < (SSC), for assistance in predicting spill movenent. Then, using the Clean Gulf Operations Manual, Volume I I , Section V, identify the biologically sensitive area and determine the

appropriate response mode. Section V, Volume I I of the CGA Manual containing maps as l i s t e d above, also includes equipment containment/cleanup protection response modes for the sensitive areas.

Section VI, Volume I I of the CGA Operations Manual depicts the protection response modes that are applicable for oil spill clean-up 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 use 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.

NEW OR L.mSUAL TECHNOLOGY

No new or unusual technology will be utilized during the proposed operati ons.

LEASE STIPULATIONS

Stipulation No. 1 attached to and made a part of each oil and gas lease Involved in the subject unit area provided for the preparation of a Cultural Resource Study to determine the potential existence of any cultural resources that may be affected by operations. This stipulation was waived on all lease blocks within the unit area.

Stipulation Ho. 5 attacheJ to and made a part of the subject leases provide for the Regional Director to suspend or temporarily prohibit production or any other operation or activity i f such suspension or cessation is necessary to complete operations described in an approved Development Operations Coordination Document. The subject unit is currently maintained by an approved suspension of production through October, 1990.

Currently, operators in water depths greater than 400 meters are required to provide certain data 1n order for MMS to make determinations regarding the possibility of chemosynthetic communities being present and the potential of their being harmed by exploration and development activities.

DISCHARGES

All discharges associated with the drilling and production of the subject wells w i l l be in accordance with the permit limitations addressed in the Environmental Protection Agency NPDES General Permit for the Gulf of Mexico.

Dischargps will contain no free oil and will be in compliance with and monitored in accordance with the subject permit. Any drilling fluid contaminated with oil will be transported to shore for proper disposal at an authorized disposal site. A listing of typical mud components which may be utilized during the proposed drilling operations is Included as Attachment F.

Quantities and rates of discharges associated with the proposed drilling operations is included as Attachment G.

Solid domestic wastes will be transported to shore for proper disposal at an authorized disposal site.

Sewage will De treated on location.

Mud may be discharged for purposes of dilntion or i t end of well.

ENVIRONMENTAL REPORT

An Environmental Report is included as Attachment H.

COASTAL ZONE CONSISTENCY CERTIFICATION

A Certificate of Coastal Zone Management Consistency for the State of Louisiana i3 enclosed as Attachment I . Copies of the Public Notice requests for publication in the Baton Rouge State Times and appropriate Parish Journal are enclosed as Attachments J and K.

PROJECTED EMISSIONS

Projected Air Emissions are if.eluded as Attachment L.

ONSHORE SUPPORT BASE

The Mississippi Canyon 487 Unit Area is located approximately 46 miles from the nearest shoreline south of the Louisiana coastline in a water depth of approximately 560 feet 1n the c*.itral area of Block 486 to 1760 feet in the northeast corner of Block 48/, all being located within the Mississippi Canyon Area A vicinity map showing the proposed surface location of Production M2* form "A" In Block 486 relative to the shoreline 1s included as Attachment M.

AEDC will utilize existing onshore support facilities located In Fourchon, Louisiana. The following details the type and number of trips for support vessels during the proposed operations.

Drilling Operations Production Operations

Crew Boat Supply Boat Helicopter

7 Trips Per Week 4 Trip Per Week 7 Trips Per Week

1 Trip Per Week 2 Trips Per Week 2 Trips Per Week

The proposed ac t i v i t ies associated with Mississippi Canyon 487 Unit should not result fn any Increase in the size and number of onshore support and storage I t i e s or land and personnel requirements.

AUTHORIZED COMPANY C NTACT

The authorized company contact for questions concerning the proposed a c t i v i t i e s i s :

Hs. Connie J . Goers J . Connor Consulting P. 0. Box 218753 Houston, Texas 77218 (713) 558-0607

LIST QP ATTACHMENTS

A Well 'Location Table B Diver ter and BOP Schematics C Platfonn Elevation Drawing D Structure Map E Bathymetry Hap F Typical Hud Components G Quanti t ies and Rates of Discharges H Envi rt..mental Report I Coastal Zone Consistency Cer t i f i ca t ion J Public Notice Request - State Tines K Public Notice Request - Parish Newspaper L Projected Air Emissions H V i c i n i t y Hap

AEDC (USA) INC.

INITIAL OEVELOPMENT OPERATIONS COORDINATION DOCUMENT

HISSISSIPPI CANYON 487 UNIT

UNIT AGREEMENT NO. 754389006

WELL LOCATION TABLE

ME1L LOCATION TOTAL OEPTH WATER DEPTH

AA PSL: 9740' FSL & 4620' FEL of 486 582' PBHL:

BB PSL: 9740' FSL & 4620' FEL of 486 582' PBHL:

CC PSL: 9740' FSL & 4620' FEL of 486 582' PBHL:

DD PSL: 9740' FSL & 4620' FEL of 486 582' PBHL: "

ATTACHMENT A -1

4 8 6 A E O C I U S A I 0 0 O C S - G - 6 9 5 7

P/F 4 6 2 0 > E L | - — | 9 7 4 0 FSL

A m o c o 1/3.

A r c o 1/1 S t k .

4 8 7 A E O C I U S A I

ocs-o- t i f f

/ •0>Ch«vron 4 . *

/ / /

• Ch.vron 1 / i • .

•^•Ch««rcn5 Arco 1/1 Stk.

/ /

A. Chevron 2 /3 /

/

• >

5 3 0 A E O C I U S A I O C S - C - 6 9 6 2

Amoco 1

/ /

/ /

/ /

/ /

/ /

5 3 1 / A E C C I U S A I / O C S - O - 8 8 2 5

/ /

/ /

/ /

/ /

/ /

/ /

f

/ /

/ /

/

AEDC (USA) LOCATION PLAT

MISSISSIPPI CANYON AREA

(PROPOSED SURFACE LOCATIONS AND EXISTING WELL SURFACE LOCATIONS)

ATTACHMENT A-2 Scale 1" - AOOO Ft . 2/19/90 I 0' ' i ' t i sooo

BLOWOUT PREVENTER STACK WITH A

HYDRIL DIVERTER • , JD

Refer to foOowing page lor description ol individual Hems of thia assembly.

ATTACHMENT B-l

20" HYDRIL DIVERTER 2000 psi ITEM DESCRIPTION

1 2 3 4

20" HYDRIL 2000 pai Type MSP 20* FLANGE SPOOL 2000 psi w/6' 2000 psi Outlets 6" GATE VALVE std Low Pressure (REMOTE) 6* DP.'ERTER LINE (To Overboard)

BLOWOUT PREVENTER STACK 13%' 10,000 psi

5 13%* HYDRIL ANNULAR BOP 5000 psi Type GK H25 Trimmed 6 13%' CAMERON DOUBLE BOP 10.000 psi WP H,2S Trimmed 7 13V.' CAMEKON SINGLE BOP 10.000 psi WP H,2S Trimmed t 4'A«" MANUAL GATE VALVE Cameron Type "F~ H,2S 9 Vhkf REMOTE HYDRAULIC VALVE Cameron Type " F " 10.000 pai H,2S 10 2Vi«' MANUAL GATE VALVE Cameron Type " F " 10.000 psi H,2S 11 2Vn' CHECX VALVE Cameron Type "R" 10.C00 pai H,2S 12 3' 10,000 psl KILL LINE from Choke Manifold 13 3" 10,000 pal CHOKE LINE from chcke Manifold

ITEM DESCRIPTION

6'UNE ATTACHMENT B-2

DRILLING HUD COMPONENTS

COMHON CHEMICAL OR CHEMICAL TRADE NAME

Aluminum Stearate "AXTAFLO-S" Barite Calcium Carbonate Calcium Chlordie Calcium Oxide Calcium Sul fate Carboxymethyl Cellulose Caustic Potash Caustic Soda Chrome L ign i te Chrome Lignosulfonate Dri 11i rg Detergent "E-Pal" Ferrochrome Lignosulfonate Gel

Gypsum Lignite Lignosul fonate "Mud Sweep" "MOR-REX" "Shale-Trol" Sapp Soda Ash Sodium Bicarbonate Sodium Carboxymethyl Cellulose Sodium Chloride Sodium Chromate Starch "TX-9010" •TORQ-Trim" "Black Magic" •Black Magic Supermlx" Diesel

•Jel f lake" MICA •P1pe-Lax" "Wall-Nut" Wood Fibers

DESCRIPTION OF MATERIAL

Aluminum Stearate Nonionic Surfactant Barium Sulfate (BaSo4) Aragonite (CaCoi) Hydrophilite (CaCI2) Lime (Quick) Anhydrite (CaS04) Carboxymethyl Cellulose Potassium Hydrate Sodium Hydroxide (NaOH) Chrome Lignite Chrome Lignosulfonate Soap Non-toxic, biodegradable defoamer Derived from wood pulp Sodium montmorillonite, bentonite, attapulgite CaSo4.2H20 Lignite Lignosulfonate Cement Pre-flush Hydroloyzed Cereal sol id Organo-aluminum complex Sodium Acid Pyrophosphate Sodium Carbonate NaHC03 Sodium Carboxymethyl Cellulose NaCI NaCr04.10H20 Corn Starch Biodegradable d r i l l i n g lubricant Biodegradable d r i l l i n g lubricant 011 base mud cone. Sacked concentrated o i l base mud Used to mix certain loss-c i rcu la-t ion p i l l s Plastic f o i l , shredded cellophane Loss-circulation material Surfactant mixed with diesel Ground walnut shells Loss-circulation material

ATTACHMENT F

P.O. Box 218753 Houston. Texas 77218 713-558-0607

ENVIRONMENTAL REPORT

MISSISSIPPI CANYON 487 FEDERAL UNIT

UNIT ACREEMENT NO. 754389005

0FFSH0XE, LOUISIANA

Prepared by:

J. Connor Consulting P.O. Box 218753

Houston, TX 77218 713/558-0607

April, 1990

ATTACHMENT H

TABU QF CONTENTS

TITLE PAGE I

TABLE OF CONTENTS i i

I . DESCRIPTION OF PROPOSED ACTION 1

A. DESCRIPTION OF PROPOSED TRAVEL MODES, ROUTES AND FREQUENCY 1

B. ONSHORE SUPPORT BASE 1 C. NEW OR UNUSUAL TECHNOLOGY 1 D. VICINITY MAP 1

I I . DESCRIPTION OF AFFECTED ENVIRONMENT

A. COMMERCIAL FISHING 2 B. SHIPPING 2 C. PLEASURE BOATING, SPORT FISHING AND RECREATION 3 D. POTENTIAL OR KNOWN CULTURAL RESOURCES 4 E. ECOLOGICALLY SENSITIVE FEATURES 4 F. PIPELINES AND CABLES 5 G. OTHER MINERAL USES 6 H. OCEAN DUMPING 6 I . ENDANGERED AND THREATENED SPECIES AND CRITICAL HABITAT 6 J . SOCIOECONOMIC 6

I I I . UNAVOIDABLE ADVERSE ENVIRONMENTAL IMPACTS

A. WATER QUALITY 7 B. EFFECTS ON MARINE ORGANISMS 7 C. WETLANDS AND BEACH 7 D. AIR QUALITY 7 E. COMMERCIAL FISHING 8 F. SHIP NAVIGATION 8 6. CULTURAL RESOURCES 8 H. RECREATION AND AESTHETIC VALUES 9

IV. SUMMARY 10

REFERENCES 11

LIST OF ATTACHMENTS

ATTACHMENT M - VICINITY MAP

I . DESCRIPTION OF PROPCSED ACTION

AEDC (USA) I n c . proposes to conduct i n i t i a l development a c t i v i t i e s w i th in the Miss i s s ipp i Canyon 487 Federal Uni t , Unit Agrsement No. 754389006, Offsijore, lou i s i ane .

As proposed, the I n i t i a l Development Operations Qxjrdinatian Docuaent f o r Mississippi Canyon 487 Federal Uni t provides f o r the in s t a l l a t ion of a 12-s lo t d r i l l i n g and production p la t form i n Mississippi Canyon Block 486. A t o t a l o f f o u r (4) development wel l s w M l be d r i l l e d and produced from t h i s structure, t o be designated as ProoV-.-tion Platform "A". A 12.750" r i g h t -of-way p i p e l i n e w i l l be ins t a l l ed t o transport produced Hydrocarbons from Production Pla t form "A" i n Mississ ippi Canyon Block 486 t o a subsea t i e - i n with an e x i s t i n g pipeline i n Grand I s l e Block 94.

At t h i s t ime , the planned cxjrimencement date f o r proposed a c t i v i t i e s i s on or about September 1, 1990.

A. DESCRIPTION OF FTO FOS ED TRAVEL MODES, ROUTES AND FREQUENCY

Support vessels w i l l be dispatched from a support base locate? j n Fourchon, Louisiana. The boats w i l l normally move to the block via '_ne most d i rec t route frora Fourchon, Louisiana, however, boats operating i r the f i e l d may travel from other f a c i l i t i e s nearby. Following i s an estinute of t r i p s to the proper-?d operation.

B. ONSHORE SUPPORT BASE

The proposed a c t i v i t i e s w i l l u t i l i z e a support base located at Fourchon, Louisiana. This base provides 24-hour service, a radio tower wi th phone patch, dock space o f f i c e space, parking l o t , equipment and supply storage space, d r i n k i n g a i d d r i l l water, etc . The proposed development a c t i v i t i e s w i l l help t o maintain th i s base a t fcfe* present leve l of a c t i v i t y . No expansion o f the physical f ac i l i t i

D. VLCINTTi MAP

Mississippi Canyon 487 Federal Unit is located approximately 46 miles south of the nearest shoreline south of the Louisiana coastline. Water depth varies from approximately 560 feet i n the centeral area of Mississippi Canyon Block 486 to approximately 1760 feet i i northeast corner of Mississippi Canyon Block 487. A vicinity plat slewing the proposed surface location of Production Platform "A" in Mississippi Canyon Block 486 relative to the shoreline is included as Attachment M.

I I - DESCRIPTION OF AFFECTED FĴ VTRONMENT

A. COMMERCIAL FISHING

Tne Gulf of Mexico provides 40% of the commercial fish landings in the oontintental United States. Louisiana ranked f i r s t among Gulf states in total commercial fishery landings for 1987 with nearly 1.8 b i l l i o n pounds landed, valued at $316 million. Nationally, the louisiana catch ranked f i r s t i n volume and second in value. Cameron, Louisiana was the leading U.S. port in quantity of commercial fish landings.

Louisiana landed 45% of the shrimp, 65% of the oysters, and 80% of the menhaden harvested from the Gulf ir> IS87. Menhaden represents the highest quantity with 1.6 bil l i o n pounds landed and shrimp represents the highest value at $185 million. In addition, each of the following species accounted for landings vai'.ued at over $1 million: spotted seatrout, red snapper, vermilion snapper, bluefin buna, black drum, red drum, blue crab. American oyster, and swordfish.

Louisiana is the most productive state in the Gulf of Mexico in terms of commercial fisheries because of i t s extensive estuaries, coastal, marshes, and nutrient input irom *•' e Mississippi and Atchafalaya Rivers. Coastal Louisiana contains approximately 60% of the estuaries and marshes in the Gulf of Mexico. Over 90% of the blue crab harvest, which accunts to about 50 Million pounds, comes from estuary nursery areas.

B. SHIPPING

The establishment of a iSeries of safety fairways or t r a f f i c separation schemes (TSS's), and anchorage areas provide urnbstructed approach for vessels using U.S. ports. Shipping safety fairways are lanes or corridors in which no fixed structure, whether temporary or permanent, is permitted. TSS's increase navigation safety by separating opposing lanes of vessel t r a f f i c . Fairway anchorage .ure areas contiguous to and associated with a fairway, i n which fixed structures may be pernitted within certain spacing limitations.

Fairways play an important role i n the avoidance of collisions on the OCS, particularly in the case of the large oceangoing vessels, but not a l l

2

vessels s tay w i t h i n the fairways. Many others, such as f i sh ing boats and CCS support vessels, travel through areas wi th high concentration o f f ixed structures. I n such cases the most important mit igat ion factor i s the requirement f o r adequate marking and l i g h t i n g of structures. Af te r a structure has been i n place f o r a while , i t of ten becomes a landmark and an aid to navigat ion fo r vessels t ha t operate i n the area on a regular basis.

Mississippi Canyon 487 Federal Uni t emcompasses a number o f lease blocks; of which a shipping fairway intersects Mississippi Canyon Block 485. The platform, d r i l l i n g uni t and each o f the marine vessels servicing these operations w i l l be equipped wi th a l l U.S. Coast Guard reguired navigational safety aids t o a l e r t ships of i t s presence i n a l l weather conditions.

C. PIEASURE BOATING. SPORT FISHING AND RECREATION

The northern Gulf of Mexico coastal zone i s one of the major recreational regions o f the United Stares, pa r t i cu la r ly i n connection wi th marine f i sh ing and beach-related a c t i v i t i e s . The coastal beaches, barr ier islands, estuarine bays and sounds, r i ve r deltas, and t i d a l marshes are extensively and intensively u t i l i z e d f o r recreational a c t i v i t y by residents of the Gulf South and tour is ts from throughout the Nation. Publicly-owned and acmunistered areas such as National seashores, parks, beaches, and w i l d l i f e lands, as well as special ly designated preservation areas such as h i s to r ic and natural sites and landmarks, wilderness areas, w i l d l i f e sanctuaries, and scenic r ivers a t t r ac t residents and v i s i t o r s throughout the yea r . Commercial and private recreational f a c i l i t i e s and establishments, such as resorts, marinas, amusement parks, and ornamental gardens, a lso serve as primary interest areas and support services f o r people who seek enjoyment from the recreational resources associated wi th the Gulf .

The two major recreational areas most d i r e c t l y associated w i t h the offshore leasing and potent ia l ly affected by i t are the offshore marine environment and the coastal shorefront o f the adjoining states. The only major recreational a c t i v i t y occurring on the OCS i s offshore marine recreational f i sh ing and d i v i n g . Major sport species sought and caught offshore include snappers, groupers, seatrout, croakers, mackerels, amberjack, cobia, dolphin, tarpon, and b i l l f i s h e s . Studies, reports, and cctiference proceedings published by MMS and others have documented a substantial recreational f i shery including scuba diving, d i r e c t l y associated wi th o i l and gas production platforms, lhe recreational f i sh ing associated wi th o i l and gas structures stems from t h e i r function as high p r o f i l e a r t i f i c i a l f i sh ing r e e f s . A report on the 1984 Marine Recreational Fishery Sta t is t ics Surveys presented by NMFS at the Sixth Annual Gulf of Mexico Information Tre

With the exception o f Grand Is le and v i c i n i t y and a s tretch of beach area i n Cameron Parish, (Peveto/Constarxse/Ocean View Beaches, Holly Beach, Hackberry Beach) Louisiana has very l imi ted beach area suitable f o r recreation. Most of i t i s very narrow, of poor recreational qual i ty and generally inac— _,ible by automobile. Some of the highest qual i ty beach areas i n CC—tal Louisiana are found along the barr ier islands chain o f f Terrebonne Parish. Several addit ional s ign i f i can t recreational resources are found along the Gulf Coast. Louisiana has ornamental gardens, scenic roads, r ive r s , and t r a i l s .

D. POTENTIAL OR KNOW CULTURAL RESOURCES

Archeolcgical resources are any objects or features which are nan-made or modified by human a c t i v i t y . S igni f ican t archeological resources are ei ther h i s to r i c or preh is tor ic and, as defined by 36 CFR 60.6, generally include properties greater than 50 ye » o ld which are associated wi th events that have made a s i g n i f i c a n t contrloution t o the broad patterns o f our h is tory; are associated w i t h the lives of persons s ign i f i can t i n the past; embody the d i s t inc t ive characteristics of a type, period, or method of construc-t i o n ; represent the work of a master; possess high a r t i s t i c values; represent a s i g n i f i c a n t and distinguishable en t i ty whose components may lack individual d i s t inc t ion ; or have yielded, or may be l i k e l y to y i e l d , information important i n prehistory or h is tory .

The proposed a c t i v i t i e s are located outside the His tor ic and Prehistoric Cultural Resources High Probability Line, and therefore are i n an area where h i s t o r i c and prehistoric resources are considered unl ike ly to be found. An Archaelogical Survey was not required on any lease blocks contained w i t h i n the Mississippi Canyon 487 Federal Uni t .

E. ECOLOGICALLY SENSITIVE FEATURES

Barrier beaches are a 0—on landform along the Gulf Coast and stretch i n an irregular chain from Florida to Texas. These elongated, narrow land-forms are compoGed of sand and other loose sediments transported by waves, currents, storm surges, ard wind. Barr ier landforms are a young coastal feature. The term "barrier" i d e n t i f i e s the structure as one that protects other features, such as bays, i*stuaries, and marshes, from d i rec t impacts o f the open ocean. By separating coastal waters from the ocean, barriers contribute t o the amount of estuarine habitat along the coast. As much as two-thirds o f the top value A t l an t i c and Gulf Coast species of f i s h are considered t o be o i r ec t ly dependent during some stage o f t h e i r l i f e on conditions i n these estuaries.

Another benef i t o f both the islards and t h e i r adjacent marshes and bays i s that of providing habitats for a large number of birds and other animals, including several threatened or endangered species, f o r example, the loggerhead t u r t l e , the southem bald eagle, a l l iga to rs , and brown pelicans. Louisiana has the most rapidly retreat ing beaches i n the nation. The

4

average re t reat f o r the Fourchon beach over the last 100 years has been i n excess of 60 f t / y r • The statewide average according to Dolan et a l . (1982) i s i n excess o f 12 f t / y r . Beaches along the deltaic p la in i n Louisiana f i t i n t o one of three categories, depending on the stage of the del ta ic cycle tha t the landmass i s experiencing. When a major d i s t r ibu tary of the Mississippi River i s abandoned, subsidence results i n a loca l sea level transgression t h a t transforms the act ive delta into an erosional headland v i t h f lanking ba r r i e r s . Fourchon Be&wh i s an example o f an eroding headland beach. With increased age and subsidence, the bar r ie r shoreline evolves in to a transgress ive barr ier i s land arc that i s separated from the mainland by a lagoon. Isles Derm ers i s an example of t h i s phenomenon. Eventually w i t h continued subsidence and sediment deprivation, the island ceases to ex i s t .

The importance o f coastal wetlands t o the coastal environment has been well documented. Coastal wetlands are characterized by high organic productivi ty, h igh det r i tus production, and e f f i c i e n t nut r ient recycling. They provide habi ta t for a great number and wide d ivers i ty o f invertebrates, f i s h , herptiles, b i rd s , and mammals. Wetlands are par t i cu la r ly important as nursery grounds f o r juvenile forms of many important f i s h species. The Louisiana coastal wetlands support over two-thi rds of the Mississippi Flyway winter ing waterfowl population and the largest f u r harvest i n North America.

Td i.nana, contains most of Lhe Gulf coastal wetlands. The deterioration of coastal wetlarus, p t t t i c u l S l l y i n Louisiar^, i s a., issue o f concern. I n Louisiana, the annual rate of wetlands loss has been measured at 50 square miles f o r the per iod 1955-1978.

A recent study funded by 14G e n t i t l e d "Causes of Wetland loss in •"he Coastal Central Gulf of Mexico", examined coastal ecosystems of the Northern Gulf o f Mexico region and how wetland habitats have changed as a result of na tura l processes fend man's a c t i v i t i e s thereon. The study's primary focus was on assessing and quant i fying the d i r ec t and indirect impacts of OCS-related ac t iv i t i e s on wetland areas. Canal construction f o r pipelines and navigation has boai the major OCS-related impacting factor.

The shelf and she l f edge of the Central and Western Gulf are characterized by topographic features which are inhabited by benthic communities. The habitat created by --he topographic features i s important because they support hard-bottom courtmities o f high biomass, high d ive rs i ty , and high numbers o f p l an t and animal species; they support, e i ther as shelter, food, c r both, large numbers of commercially and recreat ional l y important fishes ; they aie unique t o the extent t ha t they are small isolated areas of communities i n the vast Gulf of Mexico; they provide a r e l a t i ve ly pr i s t ine area suitable L i r s c i e n t i f i c research; and they have an aestlietically a t t ract ive i n t r i n s i ' : value.

The Central Gul f o f Mexico l i s t s 18 topographic features. None o f those l i s t ed are i n o r near the v i c i n i t y o f the proposed operations i n the Mississippi canyon 487 Federal Un i t . F. PIPELINES AND CABLES

5

As a prudent operator, AEDC (USA) Inc. w i l l avoid a l l pipelines and/or cables i n t h i s area while conducting ac t iv i t i es associated wi th the proposed d r i l l i n g and production opeiations.

G. OTVFP MTNFFftli ^EB

The activitJ.es proposed f o r Miss iss ippi Canyon 487 Federal Unit w i l l have no d i rec t o r i n d i r e c t inpact on other mineral uses.

H. OCEAN DUMPING

Ocean dumping i s prohibited i n vhis area.

I . ENDANGERED AND THREATENED SPECIES AND CRITICAL HABITAT

Six Federally l i s t e d endangered whale species may occur i n the Gulf o f Mexico—the b lue , f i n , humpback, r i g h t , sie, and rperm whales. Generally, these large cetaceans inhabit the continental slope and deep oceanic waters; ocassionally, they are sighted nearshore. Right whales are the most endangered cestacean i n the Gulf o f Mexico.

The FWS has designated 15 threatened or endangered species that could be affected by OCS o i l and gas operations i n the Gulf. A l l but the American czvcodUr* jabiS: the Cerrtr?! end Western Gulf. The l i s t includes three v-amnuls • a«s jag-iar jndi , ocelot, and Vvecc Indian manuf*), seven birds (the bald eejgle, a r c t i c pergrine, wrxxjping crane, brown pelican, eskrno curlew, piping p lover , c j t i least t e rn) , and s ix r e p t i l e (the Aaericar. crocodile and the h a w s k b i l l , Kemp's r i d l e y , loggerhead, leatherback, and green sea t u r t l e s ) .

The green sea t u r t l e i s threatened i n Louisiana. The Kemp's r i d l ey t u r t l e inhabits shallow water areas from Marsh Island to the Mississippi Delta i n Louisiana. Coastal Louisiana appears ro be em important subadult and feeding h a b i t a t . The hawksbill t u r t l e inhabits reefs, shallow cOMta] areas, and passes i n water less than 15 m deep. The leatherneck t u r t l e i s the most pe lag ic marine t u r t l e and may be found near the continental shelf edge. The loggerhead t u r t l e occurs throughout the GulC and has been observed as f a r as 500 miles o f f shore . I t i s known t o ri-equent natural and manmade s t ruc tures , including o i l and gas platforms.

Brown pelicans are l i s ted as endangered i n Louisiana. Three brown pelican rookeries occur on Last Is land (Terrebonne Farish), North Island (St. Bernard Parish , and Quaen Bess Island (Jefferson Farish), Louisiana. Endangered b a l d eagles inhabit the Gulf coastal, areas o f Louisiana. The piping p lover u t i l i z e s the beaches, sandflats, and dunes o f Louisiana between September and March.

J . SPCIQECCtCfllG

6

The offshore o i l exploration industry including o i l companies, d r i l l i n g contractors, and o i l f i e l d suppliers provide E major input t o Louisiana's economy. A number o f ports i n the Central and Western Gulf have developed in to important centers f o r offshore support. The most active o f these i n Louisiana are ( f rom east to west) Venice, Horgan Ci ty , Intracoastal City, and Cameron, Louisiana. The onshore support base f o r operations i n Mississippi Canyon 487 Federal Unit i s Fourchon, Louisiana. Fourchon i s almost e n t i r e l y dependent on the o i l and < * —Brc ia l f i sh ing industries f o r direct and i n d i r e c t employment i n support industries (Gosselink et a l . , 1979). As previously stated, no new employees w i l l be required f o r t h i s project, e i the r as d r i l l i n g crews or i n support functions.

I I I . UNAVOIDABLE ADVERSE ENVTRONMENTAL EFFECTS

A. WATER gJALTTY

Develcpment d r i l l i n g and i n i t i a l a c t i v i t i e s associated w i t h placing the development we l l s on production w i l l temporarily reduce water qual i ty adjacent t o the proposed surface locations. This w i l l increase t u r b i d i t y i n a plume dcwn—current frora the work s i t . Released waters and a minor o i l s p i l l could also contribute to water qua l i t y degradation.

B. ggBBS ON MARINE ORGANISMS

Some organisms w i l l be k i l l e d and some w i l l be temporarily funct ional ly impaired as a r e s u l t o f development operations. The most a f fec ted grcups w i l l be plankton and benthos immediately around the proposed structures. Damage w i l l be both mechanical and tox ico log ica l . Ihese impacts are considered t c be local ized, short term and reversible at the peculation leve l .

An o i l s p i l l could a f f e c t a broad spectrum of mariie organisms. However, most effects would be localized and short term. Any ef fec ts cti mammals and tur t les would be s i g n i f i c a n t .

I n the un l ike ly event o f a s p i l l occurring and reaching shore, organisms i n wetland and beach habi ta ts could be k i l l e d o r funct ional ly impaired. Human oommunity disrupt on could also occur. Although a l l such e f f e c t s would be localized, any e f f e c t s on endangered species and/or c r i t i c a l habitats would be s ign i f i can t .

D. AIR QUALITY

7

The major impact producing factors on a i r qua l i ty from OCS-related a c t i v i t y are due t o combustion, evaporation, or venting of hydrocarbons. The a i r quality a t the lease s i t e w i l l be degraded temporarily during operations, as a resul t from support vessels (boats and helicopters) as well as from the d r i l l i n g r i g . Anticipated emissions are expected t o be below MMS guidelines l i m i t s and a i r qual i ty should return t o normal once operations are measurably completed. Offshore a c t i v i t i e s probably w i l l not a f fec t onshore a i r q u a l i t y because of the distance between the d r i l l i n g r i g and shore. A i r q u a l i t y a t the onshore base w i l l be oniy ins ign i f i can t ly reduced by onshore a c t i v i t i e s . Any such e f f e c t w i l l be temporary.

E. COMMERCIAL FISHING

The major impact producing factors on fishing activities from the proposed operations i s structure placement, OCS produced water discharges, sale-related o i l s p i l l s , and underwater OCS obstructions such as pipelines and debris.

O i l s p i l l s t ha t contact the coastal marshes, bays, estuaries, and open Gulf areas wi th high concentrations of f l o a t i n g eggs and larvae have the greatest p o t e n t i a l f o r damage to commercial f i sher ies . The majori ty of the Gulf 's f ishes are estuarine dependent. An o i l s p i l l could seriously a f fec t commercial f i s h e r i e s such as menhaden, shrimp, and blue crab that use these areas as nursery o r spawnr-g grounds.

One production p la t fo rm with a surrounding 50C f t navigational safety zone, may remove approximately 9 acres of t rawl ing space, and underwater OCS obstructions cause gear conf l i c t s which resul t i n such losses as trawls, shrimp catch, business downtime, ani vessel damage.

Commercial f i s h e r y resources may also be affected by the discharge of d r i l l i n j muds and produced waters. D r i l l i n g muds contain material toxic to marine f i shes ; however, t l i i s i s only a t concentrations four or f i v e orders of aacpituda higher than those found more than a few aeters from the discharge po in t . Further d i l u t i o n i s cixtremely rapid i n offshore wate-3.

Tne i n s t a l l a t i o n o f pipe! nes may "cntr ibute t o s a l i n i t y regimes, water current pat terns, t u r b i d i t y and/or wetl. and/seagrass loss, and, therefore, negatively impact f i shery resources.

I n conclusion, although these factors impact the commercial f isheries industries, the l e v e l o f impact i s expected t o be very negl ig ib le .

F. SHIP NAVIGATIOM

0

Very l i t t l e irrterference can be expected between the d r i l l i n g un i t , structures and marine vessels u t i l i z e d during development operations and ships tha t use established fairways. However, a t night and during rough weather, f o g , and heavy seas, ships not using established fairways could col l ide w i t h the structures. Approved aids to navigation w i l l be ins ta l led on the d r i l l i n g un i t , structures and a l l marine vessels servicing these operations i n accordance with USCG regulations.

G. CUIJUPAL RESCURCE:

There i s on ly a small probabil i ty that an unknown cu l tu ra l resource, exists i n the lease area.

H. RECREATION AND AESTHETIC VALUES

The d r i l l i n g u n i t , structures and marine vessels may represent an obstacle to some spor t fisherman, but such an e f f e c t i s expected t o be negligible and not permanent.

Even though exis t ing regulations and orders p roh ib i t indiscriminate l i t t e r i n g o f the marine envircnment wi th trash, offshore o i l and gas operations involv ing men, mach- ^s, equipment, and supplies i s bound to result i n some l i t t e r i n g of the ocean. Human nature and accidents asso-ciated w i t h offshore operations w i l l contribute some f loatable debris t o the ocean environment which w i l l eventually come ashore on major recre-ational beaches.

Tie e f f ec t s t h a t normal operations or a minor o i l s p i l l would have on any f i s h stocks important tc sport fishermen are also considered t o be negligible.

A minor o i l s p i l l and/or non-petroleum f loa t ing debris cxuld f o u l beaches inshore o f the lease area. The fou l ing of the beaches would be an aes-thet ic detriment that could adversely a f f e c t recreation. Any ef fec ts on b&aw^ recreation ccuid adversely a f f e c t tourism, and f iawarf jent ly , t i e local ecc.

rv. SUMMARY.

The prcpceed ac t iv i ty w i l l be carried cut and carpleted with the guarantee of the following items.

A. The best available and safest technologies w i l l be utilized throughout the project. This includes meeting a l l applicable reguirements far equipment types, general project layout, safety systems, and equipment and nonitoring systems.

B. Al l operations are covered by a Mx.merals Management Service approved O i l Sp i l l Contingency Plan.

C. A l l applicable Federal, State, and local requirements regarding air emission and water quality and discharge for the proposed act ivi t ies , as well as any other permit conditions, w i l l be complied wi th .

D. The proposed activities described in detail i n the Initia. 1

Development Operations Coordination Document w i l l comply with Louisiana's Coastal Management Program and w i l l be conducted in a manner consistent with such Program.

10

Rl#T3

* = » F > R - l l - 9 e W E D 7 : 1 2

COASTAL ZONE MANAGEMENT

CCNSISTENCY CERTIFICATION

INITIAL EEVFIOFMENT OPERATIONS COC«DINATICtl

MISSISSIPPI CANYON 487 H M UNIT

UNIT AGREEMENT NO. 75438*006

The proposed activit ies described i n this Plan comply v i t h Louisiana's approved Coastal Zone Managenent Progran and w i l l be ccnducted i n a vanner consistent v i t h such Program.

Arrangements have been made with the State Times in Baton Rouge, Louisiana to publish a legal notice no later than Apri l 17, 1990.

Additionally, arrangements nave been made v i t h the Daily Comet Newspaper to publish notice of the proposed activities no later than Apri l 17, 1990.

AEDC (USA) UTC

Date

ATTACHMENT I

AEDC (USA) INC. TELEPHONE: (713)650-8141

1212 MAIN. SUITE M<

HOUSTON. TEXAS TO. PAX

(713)684-71

Apri l 11, 1S90

State Times Legal Ad Department Public Notice P. G. Box 588 Baton Rouge, LA 70821

Attention: Ms. Vicky Thompson

Gentlemen:

Please publish the attached notice as a legal ad, no la ter than April 17, 1990. A copy o f the published notice and b i l l should te submitted to ny attention at the following address:

I f you have any questions please contact me or Ms. Connie Goers of J . Connor Consulting at 713/558-06C'.

-erely,

AEDC (USA) INC.

Hr. Hisayasu Tokunaga AEDC (USA) Inc. 1212 Main, Suite 942 Houston, Texas 77002

Hlsayasi' Tokunaga Executive Vice President

HT:CJG:bb

enclosure

ATTACHMENT J

Public Notice of Federal Consistency Review of a Proposed Development Operations

Coordination Document (DOCD) by the Coastal Kanagement Division/Louisiana Department of Natural Resources fo r the Plan's Consistency with

the Louisiana Coastal Resources Prograra.

Appl icant : AEDC (USA) Inc. 1212 Main, Suite 942 Houston, Texas 77002

Location: Mississippi Canyon 487 Federal Unit Agreement No. 754389006 Lease of fer ing date January 5, 1984, Apri l 24, 1984 and Apri l 22, 1987

Descr ip t ion: Proposed DOCD for the above area provides for the development and production of hydrocarbons. Support ac t i v i t i es are to be conducted from an onshore base located at Fourchon, Louisiana. No ecologically sensit ive species or habitats are expected to be located near or i ffected by these a c t i v i t i e s .

A copy o f the plan desribed above 1s available for inspection at the Coastal Management Division Off ice located on the 10th f loor of the State Land and Natural Resources Bldg., 625 North 4th Street, Baton Rouge, Louisiana. Of f ice hours: 8:00 a.m. to 5:00 p.m., Monday through Friday. The publ ic 1s requested to submit comments to the Coastal Management Div is ion, A t ten t ion : OCS Plans, P. 0. Box 44487, Baton Rouoe, La. 70804-4487. Comments must be received wi th in 15 days of the date of th is notice or 15 days after the Coastal Management Division obtains a copy of the plan and i t 1s available for public Inspection. This public notice 1s provided to meet the requirements of the NOAA Regulations on Federal Consistency wi th approved Coastal Management Programs.

TELEPHONE: (713)650-8141

AEDC (USA) INC. 1212 MAIN. SUITE 943

HOUSTON. TEXAS 77002 FAX

(713)654-7712

April 11, 1990

The Daily Comet P. 0. Box 5238 Thibodeaux, LA 70302

Attention: Ms. Doris Dome

Gentlemen:

Please publish the attached notice as a legal ad, no later than April 17, 1990. A copy of the published notice and b i l l should be submitted to my attention at the following address:

I f you have any questions please contact me or Ms. Connie Goers of J. Connor Consulting at 713/558-0607.

Sincerely,

AEDC (USA) INC.

Mr. Hisa. u Tokunaga AEDC (USA) Inc. 1212 Main, Suite 942 Houston, Texas 77002

Hisayasu Tokunaga Executive Vice President

HT:CJG:bb

enclosure

ATTACHMENT K

Public Notice of Federal Consistency Review of a Proposed Oevelopment Operations

Coordination Document (DOCO) by the Coastal Managenent Division/Louisiana Departnent of Natural Resources for the Plan's Consistency with

the Louisiana Coastal Resources Progran

Applicant: AEDC (USA) Inc. 1212 Main, Suite 942 Houston, Texas 77002

Location: Mississippi Canyon 487 Federai Unit Agreement No. 754389006 Lease offering date January 5, 1984, April 24, 1984 and April 22, 1987

Description: Proposed DOCD for the above area provides for the development and production of hydrocarbons. Support activities are to be conducted from an onshore base located at Fourchon, Louisiana. No ecologically sensitive species or habitats are expected to be located near or affected by these activities.

A copy of the plan desribed above 1s available for Inspection at the Coastal Management Division Office located on the 10th floor of the State Lard and Natural Resources Bldg., 625 North 4th Street, 2aton Rouge, Louisiana. Office hours: 8:00 a.m. to 5:00 p.m., Monday through Friday. The public 1s requested to submit comments to the Coastal Management Division, Attention: OCS Plans, P. 0. Box 44487, Baton Rouge, La. 70804-4487. Comments nust 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 Regulation, on Federal Consistency with approved Coastal Management Programs.

P.O. Box 2"8753 Houston. Texas 77218 713-558-0607

Apri l 10, 1990

PROJECTED AIR EMISSION SCHEDULE FOR SUPPLEMENTAL DEVELOPMENT PROJECT

GENERAL INFORMATION

Location of Facility: Mississippi Canyon 487 Federal Unit Unit Agreement No. 754389006

Distance Offshore: 46 miles Name of Rig/Platform: Jack-Up Rig/Platform Operator: AEDC (USA) Inc. Contact Person: Connie J. Goers Well Footage to be Drilled: Date Drilling Will Begin: October, 1990 Date Production Will Begin: August, 1991

MAJOR SOURCE (OFFSHORE)

Power used aboard drilling vessel; approximate footage to bo drilled

Projected Emissions Emitted *tons/yr. Substance

CO 10.09 SO 3.21 2

NOx 47.40 VOC 3.82 TSP 3.36

* Based on 60 hphr/ft. from Table 4-3, "Atmospheric Emissions from Offshore 011 and Gas Development and Production", EPA No. 450/3-77-026, June 1977

** Emission factors from Table 3.3.3-1, "Compilation of Air Pollutant Emission Factors", Third Edition, EPA Report AP-42, August, 1977

ATTACHMENT L

Projected Air Emissions AEDC (USA) Inc. Mississippi Canyon 487 Federal Unit

Page Two

MINOR SOURCES .'OFFSHORE)*

Emitted Substance

CO SO

2 NOx VOC TSP

Projected Emission (Tons/Year)

1990

1.03 .03

.15

.09

.02

Tables 3.2.1-3, 3.2.3-1 and 2 . 1 - 1 , "Compilation of Air Pollutant Emission Factors", Third Edi t ion, EPA Report AP-42, August, 1977.

ONSHORE SOURCES

Those should be about the same as minor sources unless new ' a c i l i t i e s are ins ta l led at the onshore base. No addit ional f a c i l i t i e s are required or planned at this t ime.

TRANSPORTATION S. RVICES

Supply Boat - Tr ips Per Week During D r i l l i n g - 4 - Tr ips Per Week During Production - 2

Crew Boat - Tr ips Per Week During D r i l l i n g - 7 - Tr ips Per Heek During Production - 1

Helicopter - Tr ips Per Week During D r i l l i n g - 7 - Tr ips Per Week During Production - 2

NOTE: Major and Minor Emi ss icn f igures shown above are the maximum possible value for one year.

EMISSION EXEMPTION DETERMINATION

2/3 For CO: E - 3400 - 3400 (46) - 43,650 t( ,/year For NOx, VOC, TSP & SO : E - 33.30 - 33.3 (46) - 1532 tons/year

2

As per DOI/MMS regulat ions, th is f a c i l i t y Is exempt frcr. further a i r q u a l i t y review as 1t has been determined that i ts operations w i l l not have a s igni f icant adverse Impact on a i r qua l i t y .

MC 487 Federal Unit Agreenent No. 754389006

C H t l . 4 CANTON N O Q I . t l O V f N Mississippi CanyonJ87

Federal Unit Agreement

3