Amoco Production Comptny AtttuMofi: Nr. J . r *«tchelor Post Offlco Box SO Now leant, Loul iK.n , )150

Gentlemen:

Reference 1s mede) to your Initial Plan of exploration received November {3 , 1983, for Lease OCS-G 6031, Block A-140, Netting Island Area. This plan includes the dr i l l ing of M i t A, B, C, 0, C, F. 6, end M.

In accordance with 30 CFR 250.34, revised December 13, 1979, end our letter elated Oeneery 29, 1979, this plan has been determined to be complete at of December 8, 1983, and It now being considered for approval.

Your plan control number It K-1434 and thould bo referenced 1n your communlca. tion anr1 correspondence conceming thit plan.

Sincerely yours,

0. W. Colanat Btflonal Supervisor Rules and Production

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bcc: Lease OCS-6 6031 (OPS-4) (FILE ROON) &PS-4 ^/Public Info. Copy of the plan (PUBLIC RECORDS ROOM) 00-3

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November 21, 1983

Fi le : RJS-292-LF

PUBLIC INFORMATION COPY -

Amoco Production Company (USA) Ntw G'lf ant Region Amoco Buildm j Pott Off ict Bo« J 0 8 7 9 Ntw On t tn i . Louisiana 70150

OM$hQr# Division

Minarals Management Ssrvics Offshors Opsrstions Support P. 0. Box 7944 Mstairis, LA 70010

Attention: Ma. D. V. Solanas Deputy Minerals Manager

Subject: Plan of Exploration Mustang Island A-140 OCS-G-6031 Offshore Texas

In accordance with 30 CFR 250.34-1, Exploration Plan, revised Septenber 14, 1979, and letter dated January 29, 1979, attached please find eight copies of Amoco Production Conpany's Plan of Exploration for Mustang Island A-140, Offshore Texas.

Amoco respectfully requests your favorabls attention to this natter. Should further information be desired, please contact Harty Van of this office at telephone 504/566-6567.

Yours sincerely,

Nil P. Batchelor

Hcv/nkp .wiweernerrt Support Attachnents

PLAN OF EXPLORATION

MUSTANG ISLAND A-140

OCS-G-6031

OFFSHORE, TEXAS

AMOCO PRODUCTION COMPANY NEW ORLEANS, LOUISIANA

NOVEMBER, 1983

PUBLIC INFORMATION COPY

250.34-1 ^XPLORATION PLAN Nov—ber 21, 1983

I •

A BRIEF DESCRIPTION OF JHE PROPOSED TYPE AND SEQUENCE OF EXPLORATION ACTIVITIES TO BE UNDERTAKEN TOGETHER WITH A TENTATIVE TIMETABLE FOR THEIR PERFORMANCE INCLUDING PLAN COMMENCEMENT DATE, SEQUENCE EACH WELL IS TO BE DRILLED, TIME FRAME (DAYS) TO COMPLETE EACH WELL, AND TOTAL TIME TO COMPLETE THE PROPOSED PROJECT.

Amoco Production Conpany, 100%, acquired Mustang Island A-140 in Laass Sals 74, August 1983 for $11.4 MM.

Mustang Island A-140 is locatsd in 320 fsst of watar 65 niles offshore and east of Corpus Christi .Texas.

(Sse Attachment No. 1, Location Map).

Amoco's exploratory plan entails dr i l l ing three wells with a seni-sub-nerslbls : ig. I f these wells are successful, then two platforms will be set, and five additional exploratory wells wi l l be dri l led fron the platforas using platforn rigs. The proposed locations and depths of these wells are aa follows:

A Surface: 650' FVL 4 11,550' FNL

B. Surface: 8,900' FWL 4 650' FNL

C. Surface: 650' FVL 4 11,550' FNL

D. Surface: 650' FVL 4 11,550' FNL

E. Surface: 8,900' FVL & 650' FNL

F. Surface: 650' FVL 4 11,550' FNL

0. Surface: 8,900' FVL 4 650' FNL

H. fcarfacnl 8,900' FVL 4 650' FNL

2-

Drill ing df the f i r s t v s l l w i l l commence in January 1984, with d r i l l i n g of ths remaining weil i to end in approximately January, 1987. Total time td complete the project w i l l be approximately three years. See Attachment Nd. 2 f o r ths, Timing Schedule on the d r i l l i n g of the eight wells. I /

A DESCRIPTION OF THE DRILLING VESSEL(S), OR OTHER INSTALLATION(S) OR DEVICE(S) TO BE PERMANENTLY OR TEMPORARILY ATTACHED TO THE SEABED INDI­CATING THE IMPORTANT FEATURES THEREOF WITH SPECIAL ATTENTION TO SAFETY FEATURES AND POLLUTION PREVENTION AND CONTROL FEATURES INCLUDING OIL SPILL CONTAINMENT AND CLEANUP PLANS.

The sctual r i g to be used is uncertain at th i s time, however, i t w i l l be a semi-submersible r ig s imilar to the Alaskan Star . The r i g w i l l be equipped with a l l safety and pollut ion-prevent ion equipment required by the OCS Orders. See Attachment No. 3 for r ig and platform deta i l s . See Attachment No. 4 for Air Quality Data.

Al l operations are covered by Amoco's Oi l S p i l l Contingency Plan previ ­ously approved by the MMS.

GEOLOGICAL AND GEOPHYSICAL SURVEY RESULTS IDENTIFYING GEOLOGICAL HAZARDS AND/OR SUSPECTED ARCHAEOLOGICAL ANOMALIES RELATIVE TO PROPOSED WELL(S), A MAP IDENTIFYING ANY SUSPECTED ARCHAEOLOGICAL ANOMALIES RELATIVE TO PROPOSED WELL(S) WHERE AN ARCHAEOLOGICAL SURVEY IS REQUIRED, AND A DES­CRIPTION OF SURVEY EQUIPMENT UTILIZED.

The attached Shallow Hasard Report (Attachment No. 3) confirms that the proposed wel l locations sre free of surface f a u l t s , seafloor anomalies, and gas accumulations.

In accordance with the terms of the lease agreement, an archaeological survey was not required. See Attachment No. 6 for deta i l s on the results of the Multi-Sensor Engineering Survey.

In accordance with NTL 83-3, par. 11. A. 5, a copy of the high-resolution survey data from the two lines closest to the f i r s t proposed well i s being forwarded direct ly to the Lake Jackson, Texas Minerals Management Service D i s t r i c t .

A LOCATION MAP OF THE LEASE BLOCK(S) RELATIVE TO THE SHORELINE, INCLUD­ING A DESCRIPTION OF ONSHORE SUPPORT BASE FACILITIES, A LOCATION MAP

SHOWING EACH PROPOSED WELL, INCLUDING SURFACE AND PROJECTED BOTTOM-HOLE LOCATION, WATER DEPTH (BATHYMETRY), PROPOSED TRUE VERTICAL AND MEASURED DEPTHtOF EACH WELL.

Please reference Attachment No. 1, Index Map. This map shows ths rela­tionship of Block A-140 Mustang Island area, to the shoreline ss well as each or the proposed surface locations, true vertical depths, and mea­sured depths of the eight wells.

Operations will be conducted out of Amoco's base facility at Freeport, Texas. The base is equipped with both a heliport and boat handling facilities.

CURRENT STRUCTURE MAPS AND, AS APPROPRIATE, SCHEMATIC CROSS SECTIONS SHOWING EXPECTED DEPTH OP. MARKER FORMATIONS.

NOTE: Amoco Production Company believes all geologic information sub­mitted under this section to be exempt from disclosure under the Freedom of Information Act and its implementing regulations.

Attachment Nos.7,6 and 9 are Structure Maps. Attachment Nos. 10 & 11 are

Schematic Cross- Sections showing the geologic setting of tbe prospects and depicting structural relationships as determined by interpretation of proprietary data.

A BRIEF DESCRIPTION OF PROCEDURES, PERSONNEL, AND EQUIPMENT USED IN YOUR OIL SPILL CONTINGENCY PLAN THAT ARE TO BE USED FOR PREVENTING, REPORT­ING, AND CLEANING UP A POLLUTION SPILL, INCLUDING EQUIPMENT LOCATION AND TRAVEL AND DEPLOYMENT TIME.

In addition to those systems commonly utilized by industry to prevent pollution, Amoco is a member of Clean Gulf Associates which is a combine of companies formed to clean up oil spills if such occur. Existing oil spill cleanup equipment with beach protection and bird-cleaning stations can bs on hand within 18 hours in the svent of a spill. This equipment is maintained on standby and in a ready state at locations such as Grand Isle, Louisiana; Houma, Louisiana; Intracoastal City, Louisiana; Cam­eron, Louisiana; Rockport, Texas; and Galveston, Texas.

All applicable safety and pollution standards of the MMS, USCG, OSHA, and the EPA will be complied with. All personnel will be trained in the proper maintenance of existing equipment and will participate in drills

4

I

and inspections designed to enhance their a b i l i t y to u t i l i z e the equipment to i t s f u l l e s t extent and ensure as safe an operation as pos­sible. I

A DETAILED LIST OF MUDKCOMPONENTS AND ADDITIVES, INCLUDING THE COMMON OR CHEM I CAL'TRADE NAME OF EACH.

Components of the d r i l l i n g mud may include any or a l l of the following: barite, gel, caustic, soda, chrome lignosulfonate, l i g n i t e , sapp, alumi­num stearate, soda ash, phosphate, gilsonite, surfactant (methanol), Quick Seal, Spotty and CMC. No bacteriacides w i l l be used in the mud system. Any d r i l l i n g mud, d r i l l cuttings, sand, or other solids w i l l not be disposed of into the Gulf unless a l l of the free o i l has been removed.

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3 X

o ^ SUnFACE L O C A T I O N ^ \ * / *

SURFACE A 1 4 0 LOCATION

A.C ,D ,F

B, E, G, H

2^ .

INDEX MAP

PROPERTY OF AMOCO PRODUCTION COMPANY

Amoco Production Company NEW ORLEANS REGION

M U S T A N Q I S L A N D B L O C K A 1 4 0 O C 3 - 0 0 3 1

LOCATION MAP

. l lAfcf DATE: JANUARY 1. 1984

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MUSTANG ISLAND A - 1 4 0 TIMING S C H E D U L E O C S - G - 6 0 3 1

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ATTACHMENT NO. -J.

Alaskan Star Semi-Submersible for 1,500 ft. water depth

4} DRILLING A WORKOVER EQUIPMENT Drav.-works: Continentai-Em-co C - 3 , Type II, 3,000 hp dnven by

three EMO Model 079MB DC mc tor 3, ratine of 800,at 1,200 ipm.

Derrick: Continental-Emsco 160'x 40*. Maximum static hook

lead capacity 1,000,000 lbs. Designed tc accommo­date Rucker Motion Compensator anu Byron Jack­son Automatir Pipe Handling System.

Substructure: Continental-Emsco rigid frame all welded 40* square

x 30' high. Substructure designed for followi.ig static 'oads applied simultaneously: casing 1,000000 lbs., setback 337,on lbs.

Rotary & Traveling Equipment Continental-Emsco 49Vi" T-4950 rotary Continental-Bnsco Model RA-6f>6 blcjk Byron Jackson Model 33502 "5500" Dynaflex hook Contirtental-Emsco Model LB-650 swivel Byron Jackson block guide Mud Pumps: Two Continentai-Emsco Type FA-1600, triplex pumps

each driven by two top mounted EMD Model D79MB DC motors, 1,600 hp continuous rating, 2,000 hp in­termittent rating.

Pdwen Three EMD Model 16-645E9 diesel engines rated at

3,070 hp. Light Plant Throe EMD Mc Jel A20T-6A 2625 KVA AC. gene, at ors Caterpillar Model D-343 diesel-electric emergency

generator Poss Hill SCR System Dnlling Equipment Motors: Seven EMD D79MB 800 hp D.C. motors Diverter Assembly: Regan Typ* KFDS, Nominal 18-578" Blow Out Preventers: Ball joint-Regan CR-1,18%" nominal Connector-National 1 6 * " , 10,000 psi W.P. autolock Annular preventer -Rucker Shaffer, 16%" bore, 5,000

psi W.P. Choke and kill line varves-McEvoy, Fig. 133 EDU gate

valves Ram preventers-Two Cameron "U" double units, 16%"

bore, 10,000 psi W.P. Wellhead connector-Nationel 16%", 10,000 psi W.P.

Blow Out Preventer Controls: Cameron Payne hydraulic operating unit with graphi­

cally illustrated control panels at power unit, driller's control room and contractor's office.

Marine Riser System: 1,500' Regan Type FCH-6 Nominal 18V.H riser Bouyancy Material for Risen Emerson & Cuming eccofloat modules to cover 20

joints (1,000) ft. of 18%N Regan riser pipe Blow Out Preventer Transporter System: Rack and pinion device consisting of two "transporter

units," manufactured by Stewart & Stevenson Choke Manifold: McEvoy 10,000 psi W.P. with two hand adjustable and

two Swaco Super chokes Tensioners: Two Rucker-Shaffer 80,000 lbs. rise, tensioners Two Pucker-Shaffer 160,000 twin tensioners SL Rucker Shaffer 16.000 lbs. guideline tensioners Mud Mixing: ^ Two Mission 5 x 6 x 1 4 Magnum 80G GPM pumps Desander/D««Jhec Pioneer T 12-6 desander with 12 DSC-600 CV 6" sand-

master cyclones Pioneer T-10-4 desilter with 10 DSC-4C0 CV 4" silt-

master cyclones S.iale Shaken Brandt triple shaie shaker with dual decks and screens,

rated at 2,400 GPM. Decassen Swaco 1 Vi" jet rated for 1,000 GPM Mud Cleaners: Brandt consisting of two banks each with 4" desilting

hydrocyclcnes with 6" manifold, skid mounted with sand shaker screen. ;-_

Water Distillation Unit Two Aqua-Chem Model S 300, 7,200 gallons per day Forklift Hyster Model S-4Q3E, 4,000 lbs. capacit Air Compressors: Three Ingersoll-Rand Model 3-PA 125-1440-125, capac­

ity of 483 scfm at 125 psi Two Worthington Type EU, capacity 45 cu timin. at 250 v

psi ' Cold start and emergency air compressors

ATTACHMENT NO.

O Alaskan Star Semi-Submersible for 1,500 ft. water depth

\

Drill Pips: I | 10,00tr of 5M O.D., 19.4) \bJn., Grade "E-75", Range 2 5,000* 5" O.D. 25.60 I b i t , Grade "X-95", Range 2

30 joints 5" O.D. 50 lb/ft . Range 2, Drilco Hevi-wate drill P«po

Drill Collars: 4—9" CD. x 3" l.D. x3V long 27—8M O.D. x 3" l.D. x 31' long 2 4 — i H " O.D. x 2-13TI6" I D. x 3V long Pipe Handling Equiprnent BJ Typo "V-3A-FB-208" Power Rpe Handling System Bumper Subs: Two 6Vi" O.D. x 60" stroke Baash-Ross bumper subs,

Model 6SI-IPM Three 8" O.D. r. 60" sjoke 3aaa> Ross bu.T.per subs,

Model 6SMPM Miscellaneous: Cementing Unit Halliburton Twin HT400 Power Tongs Lamb Model 16.000 Kelly Spinner Varco 6.00 Heavy-Duty Logging Unit Schlumberger Wire Line Unit Mathey Motion Compensation Rucker-Shaffer Model

DCS 20400-R-BS-D Pen Recorder Martin-Decker relly Drilco 6" Hex. Spinning Wrench Varco SSW-20

RIG EOUIPMENT Cranes: One Manitowoc Model SC-150 pedestal crane, 120'

boom, 100.000 lbs. at 34 feet One Manitowoc Model SC-150 pedestal crane. 100*

boom, 100,000 lbs. at 34 feet One National Model OS-435, 80* boom, 109,000 lbs. at

45 feet Mooring System: Four Skagit Model WMD-48 double wildcat windlass

units, each powered by an EMD D79MB 800 hp D.C. motor and incorporating a Martin-Decker chain ten­sion indicating and eight tract recording system. Each of the eight 30,000 Ib. Moorfast anchors is at­tached by ',000' of 3" chain.

Propulsion Units: Consists of one propeller provided with a fixed Kort

\ nozzle installed in each pontoon. Each propeller is driven through a reduction gear by four D.C. EMD D79X3AMB electric motor*, total of 6.000 hp.

Crew Quarters: Air conditioned crew quarters for 103 men.

winterizing Equipment • . Derrick floor shields, driller enclosure, derrickm o

windbreak, steam or electric tracing for pipelines icing facilities, and steam or electric heating for working space.

Diving Aree: Handling equipment for a diving bell. Diving basket

Space fcr landing divers; for decompression cham­ber and miscellaneous diving equipment storage.

lifeboats: Two MASECO 64 Person, diesel propelled lifeboats Eight MFD 25 Man capacity inflatable lifeboats Par** Warehouse: Fui> complement of equipment part spares supervised

by s full time parts warenojseman Heliport

Operation of Sikorsky S61 helicopters worldwide.

RIQ STORAGE Upper Deck: Pipe Racks (4980sq. ft.) 778 LT. Riser Stowage "5,500 f t of

18 ttNDia. Open Deck (9000 sq. ft.) 250 IbsJsq. f t Main Deck: Open Deck (2487 sq. ft) 250 IbsJsq. f t Storeroom (900 sq. ft.) 350 IbsJsq. f t Weight Material 4 Cement Bulk 12^60 cu. t t Sack 6,000 sacks Liquids: Drilling Mud 1,706 bbls. Fuel Oil 6,694 bbls. Lube Oil 1,900 gals. Potable Water 1,227 bbls. Drill Water 12\230 bois. Ballast 10,886 LT.

ATTACHMENT NO. Mu

Alaskan Star

j RIQ DESCWP-riON Vessel Dimensions: Overall Length 275'0" Beam Overall V 222*-3" Height, keel to top of main deck 11V W Height, keel to top of derrick Lower Hulls (2)

Beam 50*-0" Length of hull 260'O" Distance off center line to center of hull 75'-0"

Depth of hull a W Caissons (6)

Diameter 32*-0" Elevation of top above keel 11 V-0" Overall trans, spcg. c-c 150'-0** Overall long'spcg. c«c I W O "

Main Deck: Length Overall 226 -6" Beam Overall 20T-0" Depth of Deck Girder 7*-6M

Cellar Deck: Length 83*0" Width 34 0" Distance Below Main Deck r-6" Spider Deck Opening 13'-0" x 54'

Substructure: Length 43'-6" Width 44'-0"

S)

Semi-Submersible for 1,500 ft. water depth

Design Operating Conditions:

1 Normal Severe 1 Transit Drig. Storm

Draft 19* 60* 45* Displacement (LT) 11,750 19,660 17,430 Variable Deck

Load (LT) 2.000 2,000 Wind Speed (knots) 50 100 Wave Height (max.) 45' 100' Current Speed (knots) 1.5 2 Clearance W.L to 43J* 58.5'

Underside of Main Deck Natural Penods:

Heave 19.6 19.4 Pitch 40.5 44.7 Roll 42.7 47.4

Damage Stability: Vessel complies'with ABS requirements for one com­partment flooding of hulls in all operating conditions and two compartment flooding of caissons.

ATTACHMENT NO.

Alaskan Star Semi-Submersible for 1,500 ft. water depth

RIG DESCRIPTION

Lowtr Hulls (2): Beam 50'-0* Length of Hull 260'-0' Depth of Hull 20 '-0' Caissons (6): Diameter 32 '-0* Main Deck: Length Overall 226'-6" Beam Overall 207 '-0 #

Cellar Deck: Length 83'-0' Width 34 '-0'

60' Operating Draft 45' Survival Draft 19' Transit Draft

ATTACHMENT Na Jii

61OCK No A-140

Arto ^ta j ] f l_LsJjnd Optrotor Amoco Production Compony Max. Design Btoring Load Per Pile Vfago W I M

J13GKL2JCB&L. m%%m\ »-*"ra—

Jl A T T A r U M P M T M O 3 « .

• ! •

Plan of Exploration for Mmtang Island Block A-140 OCS-G-6031

Air Quality

This attachment incl.des the information rsquirsd under 30 CFR Part 250.57(a), to make the necessary findings under that section.

Exemption Formula

The distance of the proposed fac i l i ty from the closest onshore area of a state is 48 statute miles:

The proposed fac i l i ty is at: latitude 27° 31' 28.36" north, and longitude 96° 19' 25.63" west.

The closest onshore area of i state is in Nueces county, Texas, at:

latitude 27* 49' 45.11" north, and longitude 97° 2* 5.55" west.

This produces the exemption amount of 1,598 tons/year for particulates, sulfur dioxide, nitrogen oxides and volatile organic compounds, and the exemption amount of 44,906 tons/year for carbon monoxide.

Projected Emissions

Drill ing

The wells proposed to be dri l led on this plan are as follows:

Proposed Well Proposed Measured Depth (Feet) **g Type

OCS G-6031 OCS-G-6031 OCS-G-6031 OCS-G-6031 OCS-G-6031 OCS-G-6031 OCS-G-6031 OCS-G-6031

Semi Semi Semi Semi Semi Semi Semi Semi

-Submersible •Submersible •Submersible -Submersible -Submersible -Submersible -Submersible -Submersible

Total Feet Drilled 146,109

ATTACHMENT Na JL

. Assuming that ths rate of drilling will be constant, the total feet drilled during each year of the plan are as follows:

1984 47,441 feet 1985 7,793 feet • 1986 87,203 feet . 1987 3,672 feet . #

1 Assuming 60 horsepower hours required to d r i l l one foot on an offshore oiKdnd gas drilling rig, this plan will require 2,846,460 horsepower hours to complete the 1984 portion. The duration of tho operations is 366 days. Using the emission factors for diesel powered industrial equipment from Table 3.3.3-1 of EPA publication AP-42, Compilation of Air Pollutant Emission Factors, the following total emissions are expected from this plan:

Carbon Nitrogen Sulfur Monoxide Oxide Hydrocarbons Dioxide Particulates

Drilling 9.51 43.93 3.51 2.92 3.14 Rig

Ve estimate to have two helicopter landing-takeoff cycles each day at the drilling location for the 366 day period of drilling activity. The emission factors per landing-takeoff cycle for helicopters from Table 3.2.1-3 of EPA Publication AP-42 produce the following helicopter emissions in tons:

Helicopters 2.09 0.21 0.19 0.07 0.09

Ve plan one 2,000 horsepower workboat landing with six hours of idling thiee times each week at the drilling location. The fuel consumption while idling at the drilling location is'seven gallons per hour. The emission factors (7 galIons/hour x 6 hours/landing x 3 landing/week x 52 weeks of drilling • 6,552 gallons) for CO, VOC and NOx from diesel vessel emission factors bv operating mode, Table 3.2.3-3, and the factors for SO and particulates from

Table 3.3.3-1 produce the following workboat emissions, in tons, at the drilling location:

Vorkboata 0.96 0.81 0.31 0.10 0.11

Subtotal 12.56 44.95 4.01 3.09 3.34

These eaissions are planned to occur in 1984.

Atmospheric emissions from of fi bore o i l and gas development and production (EPA 45D/e-77-206, J' ne 1977).

In 1985,.we plan to driil 1 7,793 f> t. The emissions fron the 1985 drilling operationa are as follows:

Emission^ in tons/year

1 Carbon poiioxide

Nitrogen OxTde\ Hydrocarbons

Sulfur Dioxide Particulates

Drilling

u 7.22

m 0.03

0.58 0.48 0.52

Helicopters '0.30

7.22 m

0.03 0.03 0.01 ! 0.01

Workboats 0.17 0.14 0.05 0.02 0.02

Subtotal 2.03 7.39 0.66 0.51 0.55

These emissions are planned to occur in 1985.

In 1986, we plan to d r i l l 87,203 feet. The emissions from the 1986 drilling operations are as follows:

Emissions in tons/year

Drilling 17 .48 80. ,74 6 .46 5 ,37 5. 77

Helicopters 2 .08 0. 21 0, .19 0, ,07 0. 09

Workboats 0. 96 0. 81 0, ,31 0. 10 0. 11

Subtotal 20. 52 81. 76 6. 96 5. ,54 5. 97

These missions are planned to occur in 1986.

In 1987, we plan to d r i l l 3,672 feet. The emissions from the 1987 drilling operations are as follows:

Emissions in tons/year

Drilling 0.74 3.40 0.27 0. 23 0, ,24

Helicopters 0.16 0.02 0.01 0. 01 0, ,01

Workboats 0.07 0.06 0.02 0. 01 0, ,01

Subtotal 0.97 3.48 0.30 0. 25 0, 26

These s missions are planned to occur in 1987.

3

The annual emission t o t a l s , in tons, are as follows:

1984 Drilling 12.56 44.95 4.01 3.09 3.34

1985 !

Drlilbng 2.0T. » 7.39 0.66 0.51- * 0.55

1986 *

Drilling 20.52 ** 81.76 6.96 5.54 5.97

1987 Drilling 0.97 3.48 0.30 0.25 0.26 Therefore, since none of these amounts approach 1,598 tons (44,906 tons for carbon monoxide), we request that you determine under Section 250.57(d) that this plan be exempt from further air quality review.

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Amoco Production Company (USA)

November 14, 1983

New Orion* Region Amoco Building Poet Office Box 50879 New Orteen*. Louisiana 70150

Minerals Management Service Deputy Minerals Manager. Offshore Operations Support P. 0. Box 7944 Metairie, LA 70010

SUBJECT: SHALLOW HAZARD REPORT PLAN OF EXPLORATION MUSTANG ISLAND BLOCK A-140, OCS-G-6031

A high resolution, multi-sensor, geophysical survey was conducted over those portions of the block outside of the safety fairway that covers the central portion of the block. Seven Ht1e Unes" were recorded connecting the two areas to provide continuity for mapping purposes. The results Indicate a smooth seafloor, no surface faults, seafloor anomalies, or shallow gas accumulations at the below listed surface locations:

A Surface, 650' FWL, 11,550' FNL

C Surface, 650' FWL, 11,550' FNL

D Surface, 650' FWL, 11,550' FNL

F Surface, 650' FWL, 11,550' FNL

B Surface, 8900' FWL, 650' FNL

E Surface, 8900' FWL, 650' FNL

G Surface, 8900' FWL, 650' FNL

H Surface, 8900' FWL, 650' FNL

Conventional CDP seismic and "bright-spot" data, with associated velocity analyses, are free from anomalies at the above locations.

Geologic control 1s available Immediately west at Mustang Island Block A-139. A similar geologic column 1s expected at the proposed locations.

W. A. Marshall Offshore Division Geophysicist

LGD/WAM/ggc

ATTACHMENT NO.