1

jln Vvly Reier To: RP-2-1

iMarathon 011 fonjpany Attention: Nr. F. F. Schneider 'ost Office Box 532* r

Lafayette. Louis 1<a 05

Gentlemen:

Reference 1s made to your Initial Plan of Exploration and environmental Report received November !9, .983, for Lrise OCS-G 5639, Block 2RC, South Timbalier Area. This plan Includes the dri l l ing of 10 wells*

In accordance with 30 CFR 250.34, revised December 13, 1979, and our letter dated January 29, 1979, this plan nas been determined to be complete as of November Z&» 19A3, and 1s now being considered Tor approval.

Your plan control number 1s ft-1427 and should be referenced 1n your comnr'nlca­tion and correspondence concerning this plan.

Sincerely yours.

NOV 28 1983

i

(Orig. Sgd.) D.W. Solanas ^

0. V Solanas Regional Supervisor Rules and Production

bcc: Lease OCS-G 5639 (OPS-4) (FILE ROOM) (lQPS-4 w/Publfc Info. Copy of the plan and ER (PUBLIC RECORDS kOOM) 00-6

HHekmatdoost:gtj: 11/21/83 Disk 3b

OffU* of ^ Management Support

NOV 301903

Records Management

, o. *****

EXPLORATORY DRILLING PLAN SOUTH TIMBALIER BLOCK 280

OCS-G-5639

Intersea Research Corporation conducted a high resolution geophysical survey on South Timoalier Area Block 280 for Marathon Oil Company. The survey was performed with a magnetometer, a sub-bottom p ro f i l e r , a side scan sonar, a minisparker, and an 80-inch water gun.

Interpretation of the seismic information allowed the generation of the current attached structure maps and a cross sectional schematic of the a.*ea showing the expected depths of marker formations. Additional geophysical dala w i l l be obtained as warranted as new information is gained during d r i l l i n g ac t iv i ty .

Based on che present interpretation of seismic information, locations of the proposed wells are l i s ted in the attached proprietary information copy.

The exploratory work is to be done with one or more semi-submersible type mobile d r i l l i ng rigs. As presently scheduled, two wells w i l l be directionally d r i l l ed and eight (8) w i l l be straight holes. As each well is d r i l l ed and new information is obtained, the location and number of subsequent wells on the block may change. This contingency is required in order to optimize the evaluation of the block with a minimum of wells in the most strategic locations.

Each exploratory well is projected to require a minimum of 60 days to d r i l l and evalur Present scheduling indicates that the f i r s t well w i l l spudded approximately December, 1983. Because a ten (10) well program w i l l require at least 66̂ iays of continuous d r i l l i n g ac t iv i ty , the complete program as affected by present and future r i g scheduling, is projected to extend through October, 1985.

The service base fo r this exploration program w i l l be Venice, Louisiana. Numerous service f a c i l i t i e s , including storage areas, pipe yards, mud companies, helipads, docks, and other related services, are located here and are deemed adequate to support this exploration program.

The Oil Spill Contingency Plan for Marathon Oil Company was approved January 5, 1983. Marathon is a member of Clean Gulf Associates. In the event of an o i l s p i l l , Clean Gulf's service equipment from Venice, Louisiana, w i l l be ut i l ized for cleanup operations. Oil s p i l l response time is estimated to be ten (10) hours for the Workboat t̂aunted Fast Response Systems and twenty (20) hours for the Hoss Barge Open Sea Skimmer System.

Gaseous Air Emission projections are located in the attached environmental report.

. Office of Management Support

NOV oO'J83

Records Management

Marcthon Oil Company OCS-6 - 3639

BLK. 279 BLK. 280 - A

BLK. 291

BLK. 28

MASTER SHEET IOOO

SCALE

PROPOSED MINERAL DEVELOPMENT

SO. TIMBALIER AREA - SO. ADD. GULF OF M EXICO

APPLICATION BY NOVEMBER 15,1983

MARATHON OIL COMPANY LAFAYETTE, LOUISIANA

I

Mud U M ^7 IWWPWP WWmWBf MMS* TVZkWm

TYPICAL SEMI-SUBMERSIBLE RIG

PROPOSED MINERAL DEVELOPMENT

SOUTH TIMBALIER AREA - SO. ADD. G U L F OF M E X I C O

APPLICATION BY MARATHON OIL COMPANY NOVEMBER 15. 1983 LAFAYETTE. LOUISIANA

. I •

WATER BASE MUD COMPONENTS

GULF OF MEXICO

- \ Composition

Gelling Agent

Weight Material

Thinner

Viscosifier

Lost Circulation Material

Corrosion Inhibitor

pH Control

Lubricants

Wyoming Bentonite Clay Attapulgite

Barium Sulfate Barite

Sodium Acid Pyrophosphate Leanardite Phosphate Lignite Resign Soaps Sodium i'etraphosphate Ferrochrome Lignosulfonate Oirome Lignosulfonate Polymeric Lignosulfonate Aluminum Chrome Lignosulfonate Calcium Lignosulfonate Hemlock Bark Extract Gilsonite Quebracho

Starch Carboxymethyl Cellulose Sodium Hexametaphosphate Pelletized Asbestos

Cellophane Mica Flakes Ground Nut Hulls Expanded Perlite Diatomaceous Earth Shredded Leather Rice Hulls

Filming Amine

Potassium Hydrate Caustic Soda

Detergent Castor Oil Alcohol

Various Chemicals CaCI 2

CaCot

OIL BASE MUD COMPONENTS

GULP OF MEXICO

egory • 1

K. |

Gellfng Agent

Weighting Agent

Thinner or Emulsifer

Water Loss Control Agent

pH Control

Lost Circulation Material

Composition

Organophylic Clay

Barite or Barium Sulfate

Organic Fatty Acid Amines

Modified Asphat.tine

Lime

Cellophane Mica Flakes Ground Nut Hulls Expanded Perlite Diatomaceous Earth Shredded Leather Rice Hulls

Various Chemicals Oil Diesel CaCI 2

OCEAN VIKING rx • I Ml — I MUC » » l v f |

4>4

J j~

TYPICAL PRESSURE CONTROL SYSTEM ,SEMh SUBMERSIBLE RIG

o — 1

V

ENVIRONMENTAL REPORT'

PLAN OF EXPLORATION

SOUTH TIMBALIER AREA BLOCK 280

OCS-G-5639

MARATHON OIL COMPANY

November 18, 1983

COMPANY CONTACT PERSON: MR. R. J. CORDES MARATHON OIL COMPANY P. 0. BOX 53266 OCS LAFAYETTE, LA 70505 PHONE (318) 233-8420

I

• I •

r

1 . INTRODUCTION ' *

—

Marathon 1 d i l Company plans to conduct exploratory d r i l l i n g

operations a t South Timbalier Block 280. This area i s located

approximately 93 miles southwest of Venice, Louisiana.

The o b j e c t i v e of the proposed a c t i v i t y i s o u t l i n e d i n the Plan of

Exploration. B r i e f l y , the o b j e c t i v e i s to d r i l l 8 s t r a i g h t

exploratory wells and 2 d i r e c t i o n a l exploratory w e l l s . A jack-up

exploratory d r i l l i n g r i g w i l l move on l o c a t i o n i n December, 1983.

The d u r a t i o n of the d r i l l i n g a c t i v i t y i s estimated to be 90 days

per d i r e c t i o n a l well and 60 days per s t r a i g h t hole for a t o t a l

p r r j e c t d u r a t i o n of 660 days. The e x p l o r a t i o n a c t i v i t i e s w i l l be

completed by October, 1985.

NOTE: The information included i n t h i s Plan follows the

Guidelines f o r Preparation of Environmental Reports f o r Coastal

Management Consistency Determination by the States of Alabama,

Louisiana and M i s s i s s i p p i . Sections are designated in t h i s

report to conform with those of the Guideline.

2. DESCRIPTION OF THE PROPOSED ACTION

a. Travel routes for supplies and personnel w i l l be from Venice,

Louisiana to the p r o j e c t area u t i l i z i n g workboats and

crewboats.

- 1 -

One round t r i p per boat w i l l usually occur every one to

two days. .Helicopters w i l l provide a i r # s e r v i c e averaging one

f l i g h t per day.

IM j

The Marathon shorebase at Venice, Louisiana i s already manned

and w i l l not require a d d i t i o n a l personnel. S i m i l a r l y , no

sig . i f i c a n t adjustment i n a c t i v i t y l e v e l s or f a c i l i t i e s i s

expected i n a n c i l l a r y companies such as warehouses, mud

companies, pipe storage yards, h e l i p o r t s , and other service

companies.

A l i s t of employees to be used in the proposed operations

offshore and onshore i s l i s t e d below. The l i s t i s t y p i c a l ,

though the exact number of employees may vary day by day.

Offshore

Position Number of Employees

D r i l l e r 2 Derrickman 2 Roughneck 6 Toolpusher 2 Machanic 1 Crane Operator 2 Roustabout 8 Welder 1 E l e c t r i c i a n 1 A u x i l i a r y Toolpusher 1 Cook 2 Gaily hand 3 Company Man 1 Di r e c t i o n a l Serviceman 1

To t a l , 2 crews 66 persons 33

-2-

J

I •

Onshore

Posi t i o n Number of employees

Warehouse and Wharf Helicopter Crewboat Stfpply (work) boat

6 3 4 7

T o t a l , 1, 2 crews • 40 persons 20

The d r i l l i n g r i g u t i l i z e d i n the p r o j e c t w i l l be occupied

approximately 66 persons, ""nese workers are c u r r e n t l y

assigned to the d r i l l i n g r i g . No a d d i t i o n a l personnel w i l l

be required as a r e s u l t of the d r i l l i n g a c i t v i t i e s .

c. No new support f a c i l i t i e s w i l l be needed for the proposed

act i v i t y .

d. No new techniques or unusual technology w i l l be used.

e. Maps are not requi r e d . Travel w i l l be from Venice to South

Timbalier Area Block 280.

f. P i p e l i n e routes, e t c . are not applicable at t b i s time.

ADDITIONAL INFORMATION

P o t e n t i a l waste products from the p r o j e c t w i l l include domestic

s o l i d wastes, s a n i t a r y wastes, and d r i l l i n g f l u i d s . D r i l l i n g

f l u i d s u t i l i z e d i n the p r o j e c t may be both o i l based and water

based o r i l l i n g muds. Onshore disposal of d r i l l i n g muds w i l l

depend on the composition of the muds. P o t e n t i a l components of

the J r i l l i n g f l u i d system w i l l include those components commonly

u t i l i z e d in t h i s type of a c t i v i t y . These components are l i s t e d

in the Plan of Ex p l o r a t i o n .

-3-

Thet Marathon O i l Company Gulf Coast Offshore D i s t r i c t O i l S p i l l

Contingency Plan, submitted to the M.M.S. on December 31, 1982

and; approved January 5, 1983 , discusses contingency plans f o r

preventing, r e p o r t i n g , and cleaning up s p i l l s of o i l or waste

materials. The Contingency Plan describes p o l l u t i o n prevention

procedures and r e s p o n s i b i l i t i e s for Marathon O i l Company

employees and contract personnel. Sp e c i f i c duties for Marathon

employees involved in the implementation of contingency plans are

outlined i n the O i l S p i l l Contingency Plan. The duties of

contract o i l s p i l l cleanup companies are also addressed.

Marathon O i l Company i s a member of Clean Gulf Associates (CGA).

In the fevent of a major s p i l l , equipment owned by CGA would be

u t i l i z e d i n the s p i l l c o n t r o l and cleanup e f f o r t . CGA maintains

s p i l l c o n t r o l and cleanup equipment at various coastal

communities on the Gulf Coast (Clean Gulf Associates, Operation

Manual, 1983) including Grand I s l e , Venice, Gretna, and Houma,

Louisiana. Each of these locations i s r e l a t i v e l y proximate to

the p r o j e c t s i t e .

I t is Marathon O i l Company's p o l i c y that a l l employees and

contractors w i l l comply w i t h the p o l l u t i o n prevention

requirements of OCS Orders 5 and 7.

-4-

3. DESCRIPTION OF THE AFFECTED ENVIRONMENT AND IMPACTS

a. (j.) South Timbalier Block 280 i s not known to be in an

evironmentally s e n s i t i v e area. While the d r i l l i n g r i g i s

locate d over the proposed w e l l s i t e s , 2.5 to 5.0 acres of

s e a f l o o r K ' w i l l be removed from commerical bottom f i s h i n g .

South Timbalier Block 280 i s located w i t h i n the 200 mile

Fishery Conservation Zone and i s shown to be i n NMFS

f i s h i n g g r i d zone number 14 on Visual 4-1, MMS Offshore

F i s h e r i e s Map. South Timbalier Block 280 is not located

near any major oyster areas but i s located inside the

boundary of the major f i n f i s h area.

(2) South Timbalier Block 280 l i e s outside of any major

shipping fairway.

(3) The use of pleasure c r a f t i n the pr o j e c t area may be

d i r e c t l y a ffected by the presence of the d r i l l i n g r i g . A

discus s i o n of these impacts can be found in the Final

Regional Environmental Impact Statement for the Gulf of

Mexico published i n January 1983.

Marathon O i l company was a p a r t i c i p a n t of the Minerals

Management Service sponsored study of the re c r e a t i o n a l use

associated w i t h petroleum s t r u c t u r e s . The ob j e c t i v e of

the study was to document the number of pleasure boats

associated w i t h OCS r e c r e a t i o n a l f i s h i n g . Although the

study has been concluded, Marathon w i l l continue to

support pleasure and sport f i s h i n g on the OCS.

-5-

(4) South Timbalier Block 280 is located inside the c u l t u r a l

resource s e n s i t i v i t y demarcation. Intersea Research

of'the block. Information concerning the survey is

included in the Plan of Exploration. The proposed well

si t e s appear to be located in an area with no unmanageable

shallow d r i l l i n g hazards or archeological sites. The

block seafloor shows no evidence of drowned archeolog .cai

or c u l t u r a l resources.

(5) The project area is not proximate to marine sanctuaries or

breeding grounds. Also, w i l d l i f e refuges, breeding and

spawning grounds, and marine and estuarine sanctuaries

w i l l not be affected by a c t i v i t i e s associated with t h i s

p r o j e c t .

(6) There is no indication of pipelines or other manmade

structures near the proposed woll s i t e s . No known cables

ex i s t on South Timbalier Elock 280.

(7) There are no other known minerals uses at South Timbalier

Block 280.

(8) The geology of South Timbalier Block 280 is variable, but

consists primarily of Pleistocene Shelf Deposits.

Specifics of the block geology ar* included in the Plan of

Exploration.

a high resolution geophysical survey

-6-

I I •

The most s i g n i f i c a n t source of s o l i d wastes for the

proposed a c t i v i t y i s c u t t i n g s from the bore hole and

dumped at the s i t e and consist of rock p a r t i c l e s ranging

from grain to pebble si z e . The amount of c u t t i n g s from a

10,000 foot w e l l i s estimated to be 1,000 tons.

Impacts on the environment from these c u t t i n g s would

include a burying of benthic organisms found at the r i g

s i t e . Juration of t h i s impact would be sho~t as the

c u t t i n g s w i l l s e t t l e to the bottom. The o v e r a l l impact on

benthic organisms w i l l be of a l o c a l i z e d and temporary

nature. A l i s t of d r i l l i n g mud a d d i t i v e s u t i l i z e d i n the

p r o j e c t is included i n the Plan of Exploration.

The c u t t i n g s are processed over a shale shaker and washed

to remove d r i l l i n g mud and o i l f r o them. Some of the mud

may become entrained w i t h the d r i l l i n g f l u i d s and cause a

t u r b i d i t y plume. The long term e f f e c t s of the plume are

not known although l o c a l i z e d impacts on the phytoplankton

population can be expected. No o i l based d r i l l i n g f l u i d s

w i l l be discharged overboard.

Winter and summer currents in South Timbalier Block 280

run generally to the northwest at 41 cm/sec wi t h

occasional variances.

d r i l l i n g f l u i d s . The c u t t i n g s are normally

-7-

t / • 1 ' I.

• I •

South Timbalier Block 280 does not l i e in a U.S.E.P.A.

approved Ocean Dumping Site. i

-T- ' ' - \

(9) Four species of marine t u r t l e occur in the Gulf of Mexico.

These)- are the loggerhead, green sea t u r t l e , Atlantic

Ridley, and hawksbill. These t u r t l e species are on the

endangered species l i s t . Turtles in the v i c i n i t y of the

project area would be vulnerable to major o i l s p i l l s and

possible co l l i s i o n s with boats. The potential for an o i l

s p i l l i s remote. No t u r t l e nesting grounds are located in

the v i c i n i t y of the project area, transportation routes,

or shore support base. There is l i t t l e reason to suspect

disruption of t u r t l e migrations.

Of the marine mammals occuring in the Gulf of Mexico, the

sperm whale, black r i g h t whale, sei whale, f i n whale, and

blue whale are on the endangered species l i s t . Lowery

(1974) presents a discussion of the state of knowledge of

the marine mammals o f f the coast of Louisiana and Texas.

From the information presented, i t appears that any

endangered whales discovered in the project area would be

strays, i f they occurred at a l l . Resident populations of

these whales are either in colder waters, deep waters, or

more t r o p i c a l waters. Porpoises of the genus Stannella,

Tursiops, and Delphinus are expected to commonly occur in

the project area.

-8-

• I •

The whooping crane and brown pelican were l i s t e d as

endangered in 1967 and 1970, respectively. The

transportation routes from the project area to the

shorebase (Venice, Louisiana) are not in the v i c i n i t y of

the c r i t i c a l habitat for these species.

-9-

SOUTH TIMBALIER BLOCK 280 GASEOUS AIR EMISSION PROJECTION

Airborne pollutants in this project w i l l be generated by engines on the drilling r i g , supply and transport boats, and helicopters. Attached are summaries of the projected emissions from each of these sources for'one year as well as for the duration of the project. The sum of these projected emissions were used to calculate the total projected emissions and the exemption status as listed below.

PARAMETER EMISSION EXEMPTION AMOUNT (Tons/Year)

TOTAL PROJECTED EMISSION, 1 Yr. Duration (Tons) STATUS

SO- 3,097 .4.4 Exempt

TSP

NOx

00

VOC

3,097

3,097

69,791

3,097

26.4

369.5

81.7

29.6

Exempt

Exempt

Exempt

Exempt

Bnission exemption amounts are calculated based on the following formulas from CFR 30, Part 250.57-1.

E - 33.3D (For S02, TSP, NOx, and VOC)

E « 3400D 2 / 3 (For CO)

Where E is the emission exemption amount in tons per year and D is the distance of the f a c i l i t y from the mean high water mark in statute miles.

-10-

SOUTH TIMBALIER BLOCK 280 . , GASEOUS AIR EMISSION PROJECTION

HELICOPTER SOURCES

Helicopter^ used i n this operation are expected to make one t r i p per day dur i the 660 day project duration. While in the immediate v i c in i ty , emissions w i l l

occur during takeoff and*'landing. Projected Emissions are as follows:

EMISSION FACTOR FROJECTED ONE PROJECTED EMISSIONS, PARAMETER (lbs/100 per cycle) YEAR EMISSIONS (Tons) 660 Day Project Duration (Tons)

S Q 2 0.18 0.03 0.06

TSP 0.25 .05 0.08

NCV °*57 °*10 ° ' 1 9

CO 5.7 1.04 1.88

VOC 0.52 0.09 0.17

•Emission factors are based on data from "Compilation of Air Pollutant Emission Factors," 3rd Edition, AP-42, U.S. EPA, 1977.

-11-

GA5t^^A7RD^S^foNIPRaJECriON WORKBOAT SOURCES

Workboats Jay consume up to 45,000 gallons of fuel per month. Based on this quantity of fuel consumed, the projected emissions from this source w i l l be as follows:

K. j

EMISSION FACTOR* PROJECTED ONE PROJECTED EMISSIONS PARAMETER (lns/1000 gal fuel) YEAR BIT SSI ONS (Tons) 660 Day, Project LXiration

S02 31.2 8.4 15.4

TSP 33.5 9.0 16.6

NOx 469.0 126.6 232.2

CO 102.0 27.5 50.5

VOC 37.5 10.1 18.6

•Emission factors are based on data from "Compilation of Air Pollutant Bnission Factors," 3rd Edition, .AP-42, U.S. EPA, 1977.

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SOUTH TIMBALIER BLOCK 280 GASEOUS AIR EMISSION PROJECTION

DRILLING RIG SOURCE GLOMAR MAIN PASS TI

Source Fuel Projected Emission

Running Elevation, Consumption, Emission Factor r Projected Emission 660 Day Proiect Durat ion .

Running (Ft. Above (Gallons (Pounds/1000 Gallons) (pounds/day) (Tons) Time, Sea Per

(Tons)

Engine Horsepower (Percent) Level) Day) SO? TSP NOy

33.5 469

CO VOC SO?

16.8

TSP NOy

253.3

CO VOC SQ7 TSP NOy CO VOC

6.0 83.6 18.2 6.7 Cat. D-399 1100 75 80 720 31.2

TSP NOy

33.5 469 102 37.5

SO?

16.8 18.1

NOy

253.3 55.1 20.3 5.5

TSP NOy CO VOC

6.0 83.6 18.2 6.7 Cat. D-399 1100 75 80 720 31.2 33.5 469 102 37.5 16.8 18.1 253.3 55.1 20.3 5.5 6.0 83.6 18.2 6.7 Cat. D-399 1100 75 80 720 31.2 33.5 469 102 37.5 16.8 18.1 253.3 55.1 20.3 5.5 6.0 83.6 18.2 6.7 Cat. D-399 1100 75 80 720 31.2 33.5 469 102 37.5 16.8 18. 1 253.3 55.1 20.3 5.5 6.0 83.6 18.2 6.7 Cat. D-399 1100 35 80 720 31.2 33.5 469 102 37.5 7.9 8.4 118.2 25.7 9.5 2.6 2.8 39.0 8.5 3.1 Cat. D-379(Emery) 125 1 80 480 31.2 33.5 469 102 37.5 0.1 0.2 2.3 0.5 0.2 0.03 0.07 0.80 0.2 0.07 Cat. 3306(Crane) 200 50 95 288 31.2 33.5 469 102 37.5 4.5 4.8 67.5 14.7 5.4 1.5 1.6 22.3 4.9 1.8 Cat. 3306(Crane) 200 « j 95 288 31.2 33.5 469 102 37.5 0.5 0.5 6.8 1.5 0.5 0.2 0.2 2.2 0.5 0.2 Cat. 3406(Crane) 250 60 95 360 31.2 33.5 469 102 37.5 6.7 7.2 101.3 22.0 8.1 2.2 2.4 33.4 7.3 2.7 L i s te r (Ai r Gompr) 20 1 80 48 31.2 33.5 469 102 37.5 0.01 0.02 0.2 0.05 0.02 0.003 0.007 0.07 0.02 0.007 Detroit 8V-92 350 5 75 408 31.2 33.5 469 102 37.5 0.6 0.7 9.6 2.1 0.8 0.2 0.2 3.2 0.7 0.3 (Halliburton)

0.2 3.2 0.7 0.3

GM671 (Schlumberger) 220 5 75 240 31.2 33.5 469 102 37.5 0.4 0.4 5.6 1.2 0.5 0.1 0.1 1.8 0.4 0.2

660 DAY PROJECTION TOTALS 28.8 31.4 437.2 95.3 35.2

•Bnission factors are based on data from "Compilation of A i r Pollutant Emission Factors", 3rd Edi t ion, AP-42, U. S. EPA, 1977.

'b. No socio-economic data beyond that already provided

i s required.

4J JUNAVOIDABLE 'AD'E3SE IMPACTS

An unavoidable and i r r e v e r s i b l e impact to the geology w i l l

occur due to the removal of rock c u t t i n g s from the

subsurface s t r a t a . This impact is considered n e g l i g i b l e .

The water q u a l i t y i n the immediate v i c i n i t y of the d r i l l i n g

r i g w i l l be temporarily degraded by the t u r b i d i t y r e s u l t i n g

from the d r i l l i n g f l u i d s and c u t t i n g s . Impacts on the b i o t a

of the area w i l l be of mixed q u a l i t y and dur a t i o n . The

negative impacts w i l l include the burying of benthic

organisms by the c u t t i n g s and the minor decrease i n

phytoplankton p r o d u c t i v i t y due to the d r i l l i n g mud plume.

Organism recovery rates would be dependent upon seasonal

reproduction cycles and r e c o l o n i z a t i o n by indigenous and

other species. Estimates for r e c o l o n i z a t i o n range from

months to several years.

These impacts are j u s t i f i e d due to the temporary nature of

the e f f e c t s of c u t t i n g s disposal on l o c a l water c l a r i t y and

benthic organims.

-14-

I I.

5. REFERENCES

The fallowing information sources were used in the

preparation of t h i s document:

Clean Gulf Associates, Operations Manual, 1983

Lowery, G. H., Jrv., The Mammals of Louisiana and I t s Adjacent Waters, Louisiana State Universi t y , 1974

Marathon O i l Company, Gulf Coast Offshore D i s t r i c t O i l S p i l l Contingency Plan, Lafayette, Louisiana, 1982

U. S. Department of the I n t e r i o r , Minerals Management Service, Final Reg ional Environmental Impact Statement, Gulf of Mexico

U. S. Environmental Protection Agency, Comp:lation of A i r P o l l u t a n t Emission Factors, 3r_ E d i t i o n , AP-42, 1977

Zingula, R. P., "Effects of D r i l l i n g Operations on the Marine Environment," Environmental Aspects of Chemical Use i n Well D r i l l i n g Operations, EPA 56011-75-004,1975

The proposed a c t i v i t y on OCS-G-5639; South Timbalier Block 280,

w i l l be c a r r i e d out and completed with the guarantee of the

fol l o w i n g items:

1. The best a v a i l a b l e and safest techologies w i l l be

u t i l i z e d th; >ughout the p r o j e c t . This includes meeting

a l l applicable requirements for equipment types, general

p r o j e c t l a y o u t , safety systems, and equipment and

monitoring systems.

There w i l l be no new or unusual technologies u t i l i z e d

throughout the p r o j e c t .

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I

No new employment for re l a t e d onshore f a c i l i t i e s w i l l be

required as a r e s u l t cf t h i s projected a c t i v i t y .

2. A l l operations w i l l be covered by a M.S.S.-approved o i l

s p i l l contingency plan. Marathon's Gulf Coast Offshore

D i s t r i c t Plan dated December 31, 1582, for the

preventing, r e p o r t i n g , and cleaning up s p i l l s of o i l or

waste m a t e r i a l s , was approved January 5, 1983. (See

Append ix I ) .

3. A l l applicable Federal, Suate, and loc a l requirements

regarding a i r emission and water q u a l i t y and discharge

f o r the proposed a c t i v i t i e s , as well as any other permit

con d i t i o n s , w i l l be complied w i t h .

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APPENDIX I

Notice of U. S. Geological Survey (Minerals Management Service)

Approval of the Marathon Gulf Coast Offshore D i s t r i c t Oil S p i l l

Contingency Plan.

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COASTAL ZONE MANAGEMENT

CONSISTENCY CERTIFICATION

PLAN OF EXPLORATION

SOUTH TIMBALIER BLOCK 280

OCS-G-5639

The proposed a c t i v i t i e s described i n d e t a i l i n t h i s plan comply

w i t h the State of Louisiana's approved Coastal Zone Management

Program and w i l l be conducted i n a manner consistent w i t h such a

program. A request for p u b l i c a t i o n of P"L±ic Notice of a Plan of

Exploration has been made w i t h the State Time?, the o f f i c i a l

Louisiana s t a t e j o u r n a l . The notice w i l l be published i n the

leg a l Ad Section of the States Times on November 25, 1983.

MARATHON OIL COMPANY

; -I, i. Qti Westward D i s t r i c t Operations Manager Eastern Area

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