In Reply Refer To: RP-2-1

Sohio Petrol out* Coapany Attention: Nr. Cory w. Kerlin Post Office Box 5146C Lafayette. Louisiana 70505

Gen Jeaen:

Reference is aede to yoor Initial Plan of Exploration and Environmental Report received February 13. 198e. for Lease OCS-G 564!. Block 291. South T1ci>a11er Area, and Block 781. Ew1eg Bank Area. Tnis plan includes the act ivi t ies proposed for Nells A. 3. and C.

In accordance with 30 CTR 250.34. revised Decert>er 13. 1979. aad oar letter dated January 29. 1979. tnis plan has been determined to te complete as of February 27. 1986. and Is now being considered for approval.

Tour plan control nuaber is ft-2410 aixl should be referenced In yoor corawnicatloii and correspondence concert.ing this plan.

Sincerely yours.

(Ong. Sgd.) A. Donald G

AcMng Reg 1 una 1 Supervisor Rules and Production

MJTclbert:gcw:2/19/86 Disk l r

Offfce cf Procra.i -..vices

MAR I 4 1986

Infornictton Services Section

SOHIO PETROLEUM COMPANY LA»*V| r T« LOUISIANA '0408

' BOH HAM

0<l. C£NTf« STATION

February 11, 1986

rE6 13 1986 Mr. D. W. Sol mas Regional Supervisor r Offshore Operations Support u. S. Department of the Interior Minerals Management Service P. 0. Box 7944 Metairie, LA 70010-7044

Oear Mr. Solanas:

Please find enclosed five (5) Confidential and six (6) Public Information copies of the Plan of Exploration (POE) for the above referenced project. Accompanying this POE are one (1) set of processed seismic line data off­sett ing each well location. The Hazard Study for South Timbalier Block 291 by John Chance a Associates, Inc. was submitted with the POE for South T1ihba11er Block 290 on January 3, 1985.

If you have any questions or require additional Infomitlon, please cal l Ms. Sharla Blckley at (318) 989-4200.

Re: Plan of Exploration South Timbalier Block 291 OCS-G-5645. Wells A, B & C Offshore Louisiana

Sincerely,

Regulatory Supervisor Lafayette 0 strict

/brg Attachments

c c : Mr. w. 0. Harris

PLAN OF EXPLORATION

SOHIO PETROLEUM COMPANY

OCS-G-f.645

SOUTH TIMBALIER BLOCK 291

OFFSHORE LOUISIANA

Feb-uary 11, 1986

LIST OF ATTACHMENTS

A. Description of Drilling R1g

B. Letters from SoMo Regional Geophysicist

C. Vidnity & Well Location Plats

0. Geologic Cross Section & Structure Maps

E. Drilling Mud Components

F. Environmental Report and Coastal Zone Management Consistency Certification

PLAN OF EXPLORATION SOUTH TIMBALIER BLOCK 291

OCS-G-5645 OFFSHORE LOUISIANA

Pursuant to tha requirements of 30 CFR 250.23.1, Sohlo Petroleum Company

submits the following Plan of Exploration (POE) for South Timbalier Blcok 291.

(1) EXPLORATION ACTIVITY

Tha proposed exploration activity for South Timbailer Block 291 consists of

d r i l l i n g Wells "A, B I C" from three (3) different locations. The "A a B"

locations will be dri l led as straight holes, and the "C" location will be

d r i l l e d as a directional hole. The estimated time to dr i l l these three (3)

exploratory wells 1s about two hundred seventy (270) days, with a July 1, 1986

anticipated spudding date for the "A" location.

(11) PROPOSED DRILLING RIG

Sohlo presently does not have a rig under contract for location V , B or

C ; however, these wells will be drilled with a semi-submersible dri l l ing

un i t , similar to the "Harlin 7" owned by Merlin Drilling Co. This rig 1s

capable of drilling to 25.000' In water depths of ' 300 . The r ig 's specifica­

t ions . BOP and diverter systems are shown in Attachment A.

(111) 6E0PHYSICAL WORK

Al l of the geophysical work preparatory to Initiation of exploratory opera­

t ions has been completed. A velocity survey may be run on these weils when

total depth has been reached. No other geophysical work 1s planned vnlasi

data obtained from dr i l l ing operations necessitates additional definition de­

t a i l from conventional reflection seismic methods.

POE-South Timbalier Block 291 Page 2

Two (2) copies of the shallow hazard report, "Hazard Study Blocks 290 &

291, South Timbalier Area, and Blocks 781, 782. 824 & 825, Ewing Banks Area",

prepared by John Chance & Assoc.. Inc. were submitted with the POE for South

Timbal ier Rloek 290 on January 3. 1985.

The South Timbalier Block 291 Hazard Study has been reviewed by Mr. Jack

Golden. Sohlc ' i Regional Geophysicist. Letters from Mr. Golden, in which he

agrees w i th John Chance's conclusions and addresses shallow hazards at each

well s i t e , are Included as Attachment B.

Attachment C-l 1s a v i c i n i t y map depicting the subject t r ac t ' s posi t ion

r e l a t i v e to the Louisiana shorel ine. No new onshore f a c i l i t i e s w i l l be re­

quired f o r d r i l l i ng these proposed exploratory we l ls . Existing service comp­

any f a c i l i t i e s 1n the Venice, Louisiana Area have su f f i c ien t capacity to acco­

mmodate th i s project without modif ication or expansion.

Attachment C-2 shows the proposed surface locations for Wells "A, B a C".

The Bottom Hole Location fo r the "C" well 1s shown on the Confidential copies

only . The total depth, water depth and surface locations for each of these

wel ls 1s as follows:

( i v ) VICINITY AND LOCATION MAPS

Well "A" TD: 11,350

386 Water Depth: Surface Location 9,000' FNL

2.670' FEL

Well "B" TO: 11.300'

388' 8.340' FNL 1.100' FEL

Water Depth: Surface Location

POE-South Timbalier Block 291 Page 3

W e l l -C-TO: 10,200'

324' 1.420' FNL 7,620' FEL

Water Depth: SurFace Locat ion :

( v ) STRUCTURE NAPS ANO CROSS SECTIONS

S t r u c t u r e maps and c r o s s - s e c t i o n s are inc luded in the f i v e (5) c o n f i d e n t i a l

c o p i e s o f t h i s Plan as Attachments 0-1 through 0-4 . Depths shown on c ross -

s e c t i o n s and s t ructure maps a re sub-sea measurements.

( A ) 011 S p i l l Contingency Plan

Sohlo Petroleum Company 1s a member of Clean Gulf Associates (CGA) and

would u t i l i z e t ha t o r g a n i z a t i o n ' s ecuipment to clean up an o i l s p i l l .

The closest CGA bases are at Grand I s l e , Venice and Houma Lou is iana ,

respec t i ve l y . Response times fo r CGA Fast Response Uni ts from these

t h r e e (3) l oca t ions would be 10. 12 and 13 hours , r e s p e c t i v e l y . Nan-

power to operate t he CGA's equipment would be provided by Peterson

mar i t ime Serv ices, I n c . , wros* personnel are t ra ined f o r o i l s p i l l

c lean-up opera t ions . Sohlo 's superv isory personnel would d i r e c t the

c lean-up operat ions u n t i l success fu l l y completed. Add i t i ona l d e t a i l s

can be fou.id in S o h l o ' s 1985 011 S p i l l Contingency Plan which has been

approved by the M ine ra l s Management Se rv i ce .

( v1 ) OTHER RELEVANT DATA

POE-South Timbalier Block ?91

Page 4

(B) List cf Hud Components

Attachment E is a 11st of the proposed d r i l l i n g mud components and addi­

t ives, including the common and chemical trade name of each addi t ive.

(C) Gaseous Emissions

Exploratory d r i l l i n g operations w i l l be conducted from the surface sites

described 1n Section ( i v ) using the mobile d r i l l i n g uni t described in

Section (11). Operations w i l l be of a maximum duration of two hundred

seventy (270) days.

« l the d r i l l s i t e , gaseous emissions w i l l be generated by the r i g engines

the attendant work boat, stand-by boat, crew boat, and hel icopter, and

the production tes t i ng of possible prospective reservoirs. Gaseous emis­

sions at the dock s i t e 1n Venice, Louisiana w i l l be generated by the work

boat, crew boat and hel icopter. Onshore staging for th is operation w i l l

be from exist ing f a c i l i t i e s so there w i l l be no s igni f icant increase in

missions for t h i s a c t i v i t y . Projected emissions from th is a c t i v i t y have

been calculated and are presented in the environmental report as Attach­

ment F.

(0 ) Coastal Zone Hanagement (CZH) Consistency Cer t i f ica t ion

Proposed exploration ac t i v i t i es for South Timbal'er Block 291 are consis­

tent with Louisiana approved CZM program. The Environmental Report and

Consistency C e r t i f i c a t i o n are 'ncluded as Attachment F.

The M A R U N NO 7. a column stabilized semi-submersible drilling vessel. ia one ot the largest end most ve-satile offshore drilling rigs over built Capable of operating in 1.000-M water depth in almost all aaa conditions, the M M R L I N NO 7 carries the certification of both the American Bureau of Shipping and the United States Coast Guard Designed to afford ample storage caoacitv for suooiies. and built with air conditioned quarters for 70 persona, the ng can operate for a con sidetabie period of time without servicing from the shore

ATTACHMENT A

FEATURES OF THE MARLIN NO 7

GENERAL INFORMATION

PRINCIPAL PARTS

The Marlin No 7 consists of trues principal parts

1 Tne tower holla, two barge-shaped members which provide bouyancy while unde* tow. stability wtiiie on location, find storage for fuel oil and drill water while dnlling

2 The platform. • barge-like design offers support for tha derrick substructure, all drilling machinery, and the quarters for 70 parsons.

3. The aii cylindrical co'umna join the lower hulls to tha platform as well as off ar space for chain lockers and storage of bulk mud snd cement

CLASSIFICATION

1 The vessel is constructed with accordance to rules of the American Bureau of Shipping as of June 1973. and carries the classification of Al Column Stabilized Dnlling Unit in addition, all mooring equipment j h j i i be ABS certified and shall ba classified (M)

2. In addition, the ver-sal ia conatructed to meat tha appi'cabie regula' ons of tha USCG. SOLAS. Inter­national Load I >ne Reguiationa. and U.S. Public Health Service.

PRINCIPAL DIMENSIONS

LOWER HULLS:

LENGTH

WIOTH

Oe^TH

SEPARATION

PLATFORM:

LENGTH:

WIOTH

DEPTH

HELIPORT:

LENGTH

WIOTH

MAX LOAD CYLINDRICAL COLUMNS: DIAMETER HEIGHT

330'

40

23

125'

222*

175"

16*

83

83

150 lb per square foot

30 Such as to give 110* bot­tom of lower hull to bot­tom of platform and 126' bottom of tower hull to main deck of platform.

FACILITIES A EQUIPMENT

STORAGE FACILITIES

4 Drill watar tanka wtth e capacity of 10.000 barrels

2 Potable water tanks with a total capacity of 1.500 oar re's

2 Fuet-oi' tanks with a total capacity of 4 000 Barrels

2 Fuel-oil day tanks with a capacity of i 600 gallons

1 Lube oil tank with a total capacity of 45 barrels

4 Active mud pits with • capacity of 2.000 barrels

6 Pressure tanks with 11.500 cubic feet of total capacity Any of these tanks can be used for either bante or cement A duel pneumatic pressure transfer system assists the loading unloading, and transfer of bulk materials A surge tank and weigh­

ing scale ere provided for tha mixing of bulk bante Storage area of 1.500 square faat can ba allocated to sacked cement and bante

2 Pipe racka with total area of 10.900 square feet The dnll pipe rack covers 8.000 square feet, while the remaining 2 900 square feet are used for nser pipe storage

2 Manitowoc 135-ton vicon torque converter pedestal-type iiftcranes with i20 long t<>oms

QUARTERS

Air conditioned quarters for seventy pet*o<v including one galley, one pantry, one chill W I A - H reefei control room and hospital Maximum occupancy of each stateroom is four parsons The

MARLIN NO 7 CONT. - P a g * 2

Mnrlin

galley arranged *o< ca'etena-sty'e service, ia equipped with i l l the most modern ecuipment. including sucri items as a charcoal grill and steam table

A large recrea. on room furnished with a color television ^ >a card table, -s provided fer off-duty personnel

Complete laundry 'aciiit-es. including iwo wasners. two dryers and one e«trector. aie furnished for crew convenience

A complete control room is located adiacent »o the heliport on • 3p of the quarters to provide unlimited visibility of almost ail portions c ' the rig From here, through dual electrical mimic panels, one person ran monitor and control the vessel's position and stability In addition, this parson also has access to the remote shutdown controls for the B O.P system

All spacea w.tr-n quarters ara lit by means of mercu y vapor floodlights and a an- ' I . wall mounted, fluorescent reading lamp is locatad over tha head *>f each berth.

A gaitronics five-party phone system is installed for complete communication with an parts of the vessel

A Demco model WT-SOOOC waste treatment plant, w i th capacity to service eighty parsons and handle up to 5.COO gallons per day of sow age waste, is provided

A Triton Model FW-100001 wetermeke' is incorporated nto the saltwater system to produce up to 440 gallons per hour of freshwater using waste heat f rom tha dieeel engines

SAFETY EOU.PMENT 2 sparine Salety Equipment thirty-foot cover id life­

boat* sech capable of carrying b4 persons, are provided. Powered by 40 MP West erbe* e Oiesei Engine with hydraulic starter, these boats are capable of speeds up to 10 knots Each boat u equipped with food and water in waterproof com­partments for survival of three days

2 20-person life rafts

8 Ring buoys

80 Life preservers

1 General alarm system

1 Dry chemical-type fire fighting system

1 Light water type fire fighting system

25 15-ib portable CO, fira extinguishers

7 5-ib portable dry powder extinguishers

1 100-lb dry chemical wheel-mou'.ted extinguisher on heliport

Breathing apparatus

Fire fighting suits

Resuscitato'

Stretchers lor 206 and Qoefkol helicopter

Stretchers - >kes Navy Type

Fog signal

Set obstruction lights

1 Green resc.e transport splint

8 Hand lire ixes

i

t

M O O R I N G

4 Model 500030 dual anchor chain windlasses -ompiete with wildcat assemblies for 3" anchor chain: two air actuated friction band brakes; two slow spaed bull gears' two air actuated SAE spline dutches; two air actuated wiain stoppers; two electrical Selsyn-type footage counter senders; two sets of msta'iation load calls Each dual wind-•ass unit includes one EMO D-79 traction mctor with coupling, one motor back-stopping brake, anr* one gear box

i Remote windlass control console to operate fou> deal windlasses. Model 500 0.10. from the barge control room complete with a mimic panel of the vessel

4 Local windlass control consolns for controlling anc monitonng pneurratic and r.iectrical functions for ona dual windlass Each la aocloeed within a 6' x 6' fiberglass house, and e'evsted to a height of approximately 4' (iff tna main dock. Located |uat beh nd each dual windlass, tha console is m a position to g ve an unobstructed view of both wild­est** and the spline clutch.

1 Electronic anchor line tension indicating j v l recording system for an eight-point mooring system incorporating the new Baylor modified electronic 'oad ceil*.

i Complete vessel pos ition indicating and recording system consisting of Honeywell RS-505 due* channel scoustic position indicator system as described in data shset 1881. including

i Control indicator unit with position monitor alarm

1 Ouai signal processor cabinet with automatic channel switching

i Oual vertical refere-.ee unit

MARLIN NO 7 CONT. • Pag* 3

1 Four channel output buffer ccrd for roll, pitch, .md X. Y position recording or remote display

4 Hydrophones each with 300' of waterproof cable

2 Subsea reference beacon-, with rechargeable battery packs

Provisions lor recording hole position

ANCHORS AND CHAINS 8 4000' continuous lengths 3" stud link otl rig quality

certificated anchor chain manufactured in Japan

a. Proof Test - 693.000 lbs

b Break Load Test — 1.045.000 lbs

C ToUl Weight Approximately — 2.497.400 lbs

d Studs welded both ends

16 Approximately 30.000 Ibs. Baldt moorlast certifi­cated anchors adiustable for 34* or 50* fluke angle

8 8' diameter * 10' long. 4 watertight -ompartment buoys with stay bars

8 Sets of ?" buoy per.dar.t lines consisting of 4 200' lengths and 2 100' langth each.

BALLAST CONTROL A N D WEATHER OATA

1 Ballast control and tank gauging system, a com­pete console with vaeanl mimic panel to mc .uae the following:

a. Ballast control system

b. Tank gauging system.

Weather data consisting of:

I Model 14457 wind speed and direction in­dicating and recording system with deck-mounted readout end record* •

1 Model 13523 wave profile recording system

1 Mode* 15373 vessel heave indicating and recording system

1 Modtfi 21015 pitch and roll recording system

DRILL ING PUMPS AND M U D SYSTEM

2 National Type 12P-160. 7'/," triplex single-acting sluah pumps Each unit is powered by two EMO •»'.odei 0-79 electric motors Each pump is equip­ped with a suction dampener and a Hydnl Type K-20-5000 pulsation dampener

3 Mission 6" x 0" centrifugal pumps with 12" impel­lers used for mud mixing, desiltmg and degassing These pumps are coupled to a 75-HP i 300 RPM 3-phase 60-cycle. 230/460 volt TEFC motor

2 Washdown and drill water pump units each con­sisting of 2 * 3" Mission centrifugal pump with 7 ' , ' impeller connected with 40-MP. 3600 RPM 3-phas*. 60-cycle. 230/460 volt "Marine Type' motor

2 Mission 6" x 8" centrifugal pump, coupled with 50-HP motor to precharge the National triplex mud pumps.

4 Model 74-0-15 "Lightnin" heavy-duty mud agitators, complete with 15-HP11 SO RPM. 3-ohase. 60-cycle. 230/460 volt exp1 os ion-proof motor.

1 Modal NS- 1 "Lightnin" chemical mixer coupled with %-MP 1.50 RPM. aingie-phaee. 115 volt, explosion-proof motor.

1 Hutchison-Hayes modal 54S60-0V Rjmba Shale Shaker

2 Goodail rotary noses. 37," x 75'. 10 000 psi test with standard 4" API male connections

2 Model T16-4" Pioneer Siltmaster units consisting of 16 OSC-400 CV Si l tma: - r 4 c 'donas with -eplaceabie poiyurethane blcdders

i Swaco totsi degasser

HOISTING EQUIPMENT

1 National Type 1625 OE drawworks complete with standard equipment ratad at 3.000 input HP. Thia drawworks unit is equipped with sand reel assembly complete with capacity of 30.000* of • / „ " line. Drawworks is drivan by two EMD 079MB eiectnc motors. It also includes ELMAGCO standard Model 7838 eddy currant braka. Provision in dual motor drawworks drive to provide for later addition of a third motor in the field.

1 National power orake unit with brake control st j n d and necessary intermediate pneumatic controis for 6-6 Micromatic Drilling Control and Crown-O-Matic Block Protector

i 1V," i 7500' fleicore rotary drilling line.

i ¥ia" * 15.000' gaivan.zed 6 x 7 sand line.

1 National Type C495 rotary complete with rec­tangular base and guard. 49%" table opening. 65 centerline spacing. 750-ton static load rating powered by EMO-079 motor Rotary to be coupled

M A R L I N NO. 7 CONT - Pane 4

\ liirlin

l o a National Transmission Arrangement "C " Complete with shafting, couplings, and coupling spacer to provide two speed shifting with no reverse gearing

1 Varco Type Mf* ; H hinged pir. drive Master Casing Bushing

1 Varco SJ650 Typa 27-HDP roller keliy bushing

1 Split-casing bushing. Varco •10187 to fit C495 rotary with insert for 20' O.O casing.

1 160' x 40' base K 18' top T-Leg Dynamic derrick bo l ted construction, compieta with A32S high-strength bolts and Anco lock nuts Oerrick has a ratad static hook load capacity of 1.000.000 lb. par API standard 4E with 12 lines strung to tha traveling b lock. Dead man is National typa wire to ba posit ioned outside derrick lag.

1 Specia 1 Crown block required to span 16' beam centers (water tabla) with fastlina outside of derr ick Block consists of 9—60" sheaves arranged w i th 5 down and with 2 fastlina and 2 deadline sheaves topside at skewed angles. Catline sheaves shal l ba bronze bushed

1 Ruckar Motion Compensator Assembly. Model 18/400. 18' compensation stroke. 400.000 lbs compensation hook capacity at 2.300 psi (2.400 psi rated), over 300' minimum response speed, com­plete with necessary air pressure vessels, drillers con t ro l panel, and air compressors

1 Nat ional Typa 660-H-500 traveling block ratad at 5O0~ton capacity and integrally mounted within the Ruckar compensator

1 Nat ional Typa "H-500" hook complete with conven­t iona l bail and ratad at 500-ton capacity.

1 Nat ional Typa P-500" swivel. 703453 complete w i t h standard bail. 500-ton rating.

1 L a m b hydraulic pipe handling hand to ba mounted inverted m derrick over drawworks Designed to handle* all tubular material from 3 ' V drill pipe to 24" r iser pipe at a maximum radius arm of 26'. capable Of 180* Of rotation

1 Mode l TCB Koomey Crown-o-metic lor National drawworks.

1 Hex keliy. 5%" • 3V«~ • 54' long overall. 51' working space. 7 V 0.0 top upset wi th 6 V API L H Box. 6 % " O D bottom upset with 4'/^" l .D R.H. pin down

1 O M S C O 6%" A P I box and pm. 15.000 psi keliy valve

1 Foster Air Power keliy spinner Type 77

2 Varco *3754 5" type " iDXL" extra long drill pipe slips

1 Varco «2503 type "DCS-L" drill collar slip. 6V4 to 8V«" range

1 Drill coliar slip Varco »2507 with circular buttons for 6" to 9%" collars

2 Lower keliy safety valves for 5" X H dnll pipe.

1 Electric .092 wire line unit.

1 Orill collar slip Varco #2550 with circular buttons for 5%" to 7" collars

1 Caaing slip Varco •5329. multi-segment, with circular buttons for 20" O.O. casing.

1 Insert bowl. Varco S6610 tor 13%" and 11 %" casing.

1 Caaing slip Varco #5313. multi-segment, with circular buttons for 13%" O.O. casing

1 Insert bowl. Varco »6609 for 10%- and 97," 0 0 casing.

i Casing slip Varco SS307 multi-segment with circular buttons for 9%" casing.

1 Rotary slip Varco M l34 . complete with 7" inserts for 7" O.O. casing.

i Varco 500-ton 13%" slip-type elevator body, air-manual operated, complete with necessary guides and slip assemblies

1 Set link adapter for use with 500-ton casing elevator links.

1 Set BJ 500-ton x 144" long elevator links.

1 (2) 2%~ x 132" elevator links. 150-ton rating.

1 BJ Zip iift assembly with elevator, links, and don head

2 BJ type "GG" centerlatch elevator for 5" O 0 drill pipe

1 Varco Model 10 air-powered spinning wrench, right and left rotation, complete with rollers for any one size drill pipe

1 (2) BJ type ' DB" rotary tongs. 3 V to 17" range

1 Varco S33013 "MP-R" drill collar safety clamp

i BJ wire line guide assembly complete

1 BJ wire line guide handling assembly complete

1 4AR K i n g wire line Str ipper

MARLIN NO. 7 CONT. - Pag* 5

1 4SC King circulating head with 5" x X-hole connection

1 Gray inside B O P

M A R I N E SYSTEM EQUIPMENT

2 1 % " Cameron 2000 psi WP B.O.P. Stack

i Collet connector Model 70 hydraulic with 21%" 2000 psi WP RX-73 face to face »18 clamp hub top including RX gasket, with ST/STL lined ring grooves and manual override.

1 Blowout preventer. Cameron Type **U" single unit 2 1 % " 2000 psi WP with RX-73 face to face #18 c lamp r j b with two 3%" 5000 pai WP BX-154 c lamp hub outlets assembled with shear rams, with wedgeiocks. and balance chambers with ST/STL l ined ring grooves.

1 Hydr i i blowout preventer. 21 %" 2000 pai WP clamp hub bottom and studded top with ST/STL lined r ing grooves and all standard accessories

1 Spool adapter. 21%" 2000 psi WP RX-73 face to face • 18 flange bottom and 2 1 % " 2000 psi WP "AX" c lamp hub top

24 " Riser System

i Collet connector Model 70 hydraulic with 2 1 % " 20O0 psi WP RX-73 face to face #18 clamp hub top wi th AX gasket and manual override ST/STL lined r ing grooves.

20 Riser pipe 24" O.D x %" wall wi th RCK near con­nector ends. 50* long with Integral 3%" choke and ki l l lines X-52.

1 Riser pipe 24" 0.0. x %" wall with RCK riser con­necter ends. 40' long with integral choke and kill l ine.

Assorted riser pipe lengths.

Telescoping joint 24' Marine Conductor with RCK box riser connector bottom and type "R" pin riser connector top. 45' stroke with remote pressure operated seal with integral 3'V' choke and kill lines rated for 10.000 psi WP

1 Ball lomt 21%" 2000 ps> WP RX-73 clamp hub bot tom x 24" Type RCK box riser connector top. 10* deflection pressure balanced

13%" Cameron 10.000 eel WP B.O.P. Stack 1 Collet connector Model 70 hydraulic with 13%"

10.000 psi WH BX-159 clamp hub top including AX gasket with ST/STL lined ring grooves with manuai unlock

1 Biowout preventer. Cameron Type "U" double unit 13%" 1 C.OOO psi WP with BX-159 clamp hub top and bottom w th four 3%" 10.000 psi WP BX-154 clamp hub outlets assembled with shear rams in top unit and pipe rams in bottom unit with wedgeiocks and bslanc hambers with ST/STL lined ring grooves

1 Blowout preventer. Cameron Type "U" double unit 13%" 10.000 psi WP BX-159 clamp hub top and bottom with four 3%" 10.000 osi WP BX-154 clamp hub outlets with wedgeiocks and balance chambers with ST/STL lined ring grooves snd 5" pipe rams in both cavities.

1 Blowout preventer. Cameron Type "A" i3%" 5.000 psi BX-159 clamp hub bottom with studded top with ST/STL lined ring grooves and all standard accessories 5000 psi WP.

1 Spool adapter. 13%" SOOO eol WP BX-180 Hanged bottom and 13%" 10.000 pai WP AX damp hub top with ST/STL lined ring grooves.

18" Riser System

1 Collet connector Model 70 hydraulic 13%" 10.000 psi WP BX-159 clamo hub top and manual override including AX jasket with ST/STL lined ring grooves.

1 Ball joint 13%" 10.000 psi WP BX-1S clamp hub bottom and 16" RCK box riser connector top. 10* deflection and pressuro balanced.

20 Riser pipe 16" x %" wall with RCK riser connector ends SO* long with integrsi 3%" choke and kill lines X-52 pipe.

4 Assorted riser pipe lengths.

1 Telescoping joint *6" Marina with RCK riser con­nector bottom and type "R" pin riser connector top. 45' stroke with remote operated seal wtth integral 3%" choke and kill lines.

CAMERON SUBSEA HYDRAULIC CONTROL SYSTEM FOR OFFSHORE DRILLINQ UNIT

1 Combination air ar.d eiectnc 3000 oai WP automatic pump-accumulator unit consisting of following components mounted on heavy-duty structural ateel skids complete with all necessary mani­folding

a Accumulator package consisting of eight Model NSCUA-35-3 3300 psi WP USCG approved hydro-pneumatic accumulators.

M A R L I N NO. 7 CONT - Page 6

b 300-gaiion Iluid reservoir

c. 100 gallon soluble Oil reservoir complete

2 i 500 capauty subsea hose reels mounted on heavy-duty structure! steel floor stano Two 1000' lengths of subsea control nose reel, each subsea hose containing one V I D supply hose and one hose consisting of thirty-nine %»" I O pilot hoses

2 Subsea hydraulic retrievable control pod. each pod contains sufficient valves and manifolding to operate all B O P functions to provide 100% redundance. All 4-way valves ara 3-position. spring-center type for isolation of any given function. All pod connectors are retractable, packing type

1 Emergency power battery power package compieta with battery charger and automatic switching components in t v f t of loaa of rig electrical power

1 10.000 psi choke, kill manifold with one CIW positive, one CIW ad|i.stable choke line, two lines equipped with CIW a jtomatic dril l ing chokes and one 3" circulating hnti. All lines are connected into a gas separator unit.

DIVERTER SYSTEM

i Regan support system. tek-tcopic Joint: Type KFOS. nom 24" x 4 9 V rotary Uble complete with flow line housing integral dhaf ter ball joint and riser pin

1 Support ring Type KFDS complete with 4 hydraulic rotating dogs and 4 hydraulic latching dogs

1 Handling tool, diverter aasembly: Type HT-2. nom. 24".

SUBSEA B.O.P. STORAGE A N D HANOLING EQUIPMENT

2 Hydraulieally operated blowout preventer storage skids which also serve as a supporting spider for connecting the two components of the 13%" subsea stack One skid is equipped with test and storage stumps for the 13%" B O P stack and the second skid is equipped with a test and storage stump for the 21%" B O P stack

1 100-ton capacity overhead trolley unit for assist in handling and connection of senses B.O P. stacks

RISER TENSIONER S Y S T E M - 0 * 0 . 0 0 0 LBS.

4 Oust compact tensioners—extendfd life model 80.000 lbs 50' wire line travel. 1%" iiameter wire

line grooves. 65" O 0 special Rucker sheaves with taper roller bearings Rucker long-life, easy main­tenance cylinder

4 Guide line tensioner—16.000 lbs. 40' wire line travel. 28" O D special Rucker sheaves. V/' dia­meter wire lme grooves Rucker long-life easy maintenance cylinder

4 Ingersoll-Rand air compressor with output of 15 cfm at 2500 psi to provide air for riser tensioners. guideline tensioners. and dnll string compensator.

M A I N POWER SYSTEM

2 EMO Model M016E8. 1400-KW. 675 volt. AC diesel electric marine drilling power unit, including EMO A20-6 generator.

1 EMO Model M012E8. 1050-KW. 675 volt diesel electric marine drilling power unit. Inc'uding EMO Model A20-6 generator.

13 EMO D-79MB OC dnlling motors with 480-V TEFC blower motors

1 Caterpillar—GE diesel electric set for emergenc < use Drives a GE generator as follows 250-KW, 312-KVA custom 8000 AC generator. 480 volt marine.

1 Electric Machinery Co.. 5 unit Model Thyrig SCR OC drilling control system.

1 Complete Hunt Dynaceti filtration air cleaner system for all EMO engines and motors.

2 Joy Model TAS65BWW4 Twistair Rotary Screw packages delivering 565 cfm at 125 pai for a total of 1130 cfm free air.

DRILLERS REMOTE CONTROL HOUSE

i Complete self-contained remote drilling control house located on derrick floor This allows driller a shirt-sleeve environment in wh/th—from either sitting or standing position—he can monitor and control the following systems

a B O P shutdowns and controls

b Drilling operation

c. Mud systems

d Motion compensator controls

DRILL PIPE

1 12.000' string of 5" Grade E drill pipe, consisting ol 275 joints of 5" O 0 19 50 lb Grade E range 3 seamless API inter iai-external upset drill pipe with

MARLIN NO 7 CONT. • Pag,. 7

6%" O.D Hughes fiashweid tool joints with 5" 1 hole connections and 18* taper elevator shoulder and with 6 V OD 1 3V," I 0 Hughes fiashweid tool joints with X-hole connections. 18* taper elevator shoulder

1 3.000' string of 5 Grade G "n i l pipe consisting ol 69 lomts of 5" 0 0 19 501b Grade Grange 3. seam-leas API internal-external upset drill pipe

14 7%" O 0 x2 ' y „ ' l D x 43'long drill collars 6%" API reg box x pin connections zip grooved for slips and elevators hard band between grooves.

14 7" O.O. x 2 'v „ " I D x 43' long drill collars 5" x-hole box x pin connections zip grooved for slips and elevators hard band between grooves

14 6Y," O.O. x 2'V,," 1.0. x 43' long drill collars. 4'A" x-hole box 1 pin connections zip grooved for slips and elevators hard band between groovea.

P U M P S

2 Bi lge pump units consisting of Martow Model 4E3BEL. 4 • 6". self-pnming centrifugal pump, w i th 12" impeller Dnven by 20-HP 1.880 RPM. 3-phase. 60-cycle. 230/460 volt. TEFC. "Marine Duty" motor. Rates 360 gpm at 102' TOH.

4 Bellas! pump units consisting of Crane-Oeming double auction centnfugel pump. 12" x 10" x 14%" bronze fitted, and driven by 75-HP. 1,860 RPM. 3-phase. 60-cycle. 230/460 volt. T*£FC vertical moto r Rated 3.500 gpm at 70' TOH.

2 Fins water pumps each consisting of 3" x 4 " Mission centr i fugal pump with 8%" bronze impeller, coup led with 75-HP. 3 600 RPM. 3-phase 60-cycle. 23O/400 volt motor

1 Brake-cooling system consisting of a 2" x 3" Miss ion pump coupled with 15-HP explosion-proof motor The assembly is used for brake cooling on the drawworks

4 Diesel fuel and waste oil pump units each con­sist ing of Worthington rotary pumps. Model 6GAUM coupled to a 5-HP. 1.800 RPM. 3-phase 460 volt motor pump rated at 50 gpm at 25 psig

2 Sea water pumps consisting of a 6" x 6" Mission centr i fugal pump with 12" impeller connected to 75 HP. 1.800 RPM. 3-phase. 60-cycle. 230/460 volt TEFC motor

2 Model S-3005 potable iresh water sets including the following

2 15AH-268-OP pumps driven by 1.750 RPM 3-phase 60-cyde. 2307460 volt motors capable of 45 gpm at 160 TDH

1 TS3156 tank set. to include 1—315-gaiion galvanized receiver

FISHING T O O L S

1 Complete set of fishing tools for contractor furnished downhole tools

PAINTING ANO SURFACE PROTECTION

Lower Hulls

Above the 16' water line the hull is sandblasted, pnmed with zinc, and coated with an epoxy color coat

All interior access spaces and pump rooms are blasted, primed, and epoxy color coated as called form the specifications

Ballast and drill water tanks are cleaned and coated with Escard Type 2

Fuel on tanks are cleaned and left bare

Columns

All columns and bracing are blasted, primed, and epoxy color coated Chain lockers are cleaned and given one coat of fish oil P-Tank room has been wirebrushed. primed, and then coated with enamel

All exterior surfaces are sandbias.ed. phmad with zinc, and coated with an epoxy coating

All intenor work spaces ha-* been cleaned with wire brush, primed and coated with an ena.net

Interior of mud pits has been coated with coal-tar epoxy

Potable water tanks have been finished out with 12 mil epoxy

RENTAL EQUIPMENT

1 Halliburton twin HT-400 Cement pump skid Each pump is driven by an EMO D-79 DC motor and is equipped with a relief valve set at 12.000 psi

D I V E R T E R A R R A K J G E M E M T F L A M

MARL IM MO. 1 \

DIVERTEP PANEL — DRILLER CONSOLE

MARLIN NO. 7

GAUGES

INCREASE DECREASE C

OPEN

o RETRACT

O RETRACT

O RETRACT

O RETRACT

O OPEN

o OPEN

O OPEN

o OPEN

o CLOSE

o EXTEND

O EXTEND

O EXTEND

O EXTEND

O CLOSE

O CLOSE

O CLOSE

o CLOSE

DIVERTER PACKER

LOCK DOWN DOGS

INSERT PACKER LOCK DOWN DOGS

SUPPORT RING ROT DOGS

SUPPORT RING DOGS

FLOWLINE SEAL

DISCHARGE STB.

SHALE SHAKER

DISCHARGE PORT

DRILLING MODE:

DIVERTER PACKER IN OPEN POSITION, PORT AND STARBOARD DISCHARGE VALVES I N CLOSE POSITION, SHALE SHAKER VALVE IN OPEN POSITION. INSERT PACKER LOCK DOWN DOGS EXTENDED.

FUNCTION Zt

CLOSE DIVERTER PACKER - AUTOMATICALLY OPENS PORT AND STARBOARD DISCHARGE VALVES AND CLOSES VALV"* TO SHALE SHAKER.

AFTER FUNCTION I :

TO DIRECT FLOW, IT WILL BE NECESSARY TO FUNCTION EACH VALVE INDIVIDUALLY.

SOHIO P E T R O L E U M COMPANY

TO: Ray Broussard Lafayette

DATE: January 23, 1986

FROM: Jack Golden

SUBJECT: S l t a Clearance - South Tiabalier 291 (OCS-G-5644) Proposed "A" Location

Culf Coast Division Geophysicists conclude thst no alfclf icsnt shallow dri l l iag hazards exist within 500 feet of the South Timbalier 291 "A" location (9,000* FNL, 2,670* FEL; W.D. 386*).

The resu l t s and report of a shallow hazard survey conducted by John E. Chance and Assoclstes for Sohlo Petroleum Coapany over tract 291 have been reviewed. We arc in agreement with their findings and conclude that:

1) No obstructions ara observed on the aea floor within 500 feet of the proposed location.

2) Seismic dsts Indicate a thick sequence of parallel bede (over 1,500 feet) dipping aoutheastward at approximately 40 feet per s i l e .

3) No f su l ta or gas accumulations are obaerved within the upper 1,500 feet below mudline st the proposed location.

Attachments consist of annotated copies of the SMS, pinger, and alnlaleeve records for lines 27 and 49 of the hazard aurvey.

J . Straaen (w/attachaente) R. Boyce B. Conn M. Ncese J . Ootter A. MacKeon (w/attachaenta)

Jack Coil

cc: D. Balsinger D. Harris

ATTACrfCNT R

972L/AM/acw

S O H I O PETROLEUM COMPANY

TO: Ray Broussard Lafayette

DATE: January 23, 1986

FROM: Jack Golden

SUBJECT: Si te Clearance - South T i aba l l e r 291 (OCS-G-5644) Proposed "B" L o c a t i o n

G u l f Coast Div i s ion Geophysic is t s conclude t h a t no s i g n i f i c a n t shal low d r i l l i n g hazards e x i s t w i t h i n 500 fee t of the South T i a b a l l e r 291 " I " l o c a t i o n ( 8 , 3 4 0 * FNL, 1,100* FEL; W.D. 388*).

The r e s u l t s and report o f a ahallow hazard aurvey conducted by John E. Chance and Associates f o r Sohio Petroleum Coapany over t r a c t 2°1 have been reviewed. We a r e i n agreement w i t h t h e i r t i nd ings and c rnc lude t h a t .

1) No obstruct ions are obaerved on the sea f l o o r w i t h i n 500 f e e t of the proposed l o c a t i o n .

2) Seiamic data i n d i c a t e a t h i c k sequence of p a r a l l e l beds (over 1,500 f e e t ) d i p p i n g southeastward a t approz laa te ly 40 f e e t per m i l e .

3) No f a u l t s or gas accumulat ions are observed w i t h i n the upper 1,500 f ee t below mudline at the propoaed l o c a t i o n .

A t t achmen t s consist o f annota ted copies o f the SMS, p inger , snd a i n l s l e e v e r e c o r d s f o r l ines 29 and 49 o f the hazard aurvey.

J . Strasen (w/at tachments) R. Boyce B . Conn M. Neese J . Dotter A. MacKeon (w/at tachments)

JaJk

c c : D. Balslnger D. Har r i s

ATTACHMENT B

972L/AM/acw

S O H I O P E T ROLEUM COMPANY

TO: Ray Broussard Lafayette

DATE: January 30, 1986

FROM: Jack Golden

SUBJECT: Site Clearance - South Tlsiballer 291 (OCS-C-5644) Propoaed " C Location

C u l f Coaat Division Gerphyalc lata conclude that no s i gn i f i can t ahallow d r i l l i n g hazarda ezlat wit t in 500 feet of the South T iaba l l er 291 "C" location (1 ,420* FNL, 7,620' FEL; W.D. 324' ) .

The r e s u l t s and report of a ahallow hazard aurvey conducted by John E . Chance and Associates for Sohlo Petroleum Company over t rac t 291 have been reviewed. We s r e l n agreeaeut with t h e i r f indings and conclude that:

1) No ob«Lructlona are obaerved on the aea f loor within 500 feet of the proposed location.

2) Seismic data Indicate a thick sequence of p a r a l l e l beds (over 1,500 feet ) dipping southeastward at approximately 40 feet per mile.

3) No faul ta or gaa accumulationa are observed within the upper 1,000 feet below mudline at the propoaed locat ion. At 1,000 feet below mudline, a f a u l t ia interpreted approximately 90 feet to the aoutheaat of the propoaed well-bore.

Attachments consist cf annotated copies of the SMS, pinger, and mlnlaleeve records for lines 22 and 47 of the hazard aurvey.

J . Strasen (w/attachments) R. Bcyce B. Cohn H. Neese J . Dotter A. MacKeon (w/attachments)

Jack

c c : D. Balalager D. Harris

ATTACHMENT B

972L/AM/acw

SOHIO p Q 1 OCS-G-5645 " 1

•c- O

P.T.O--11.300' O

P.T.0.-U.3S0'

PIBHC INFORMATION

-LECEMO-

O PROPOSED WELL UKflTMNS LOCATION -trt 9i)00TNU i ^ ^ T E L LOCATION -B°t 8.340'FNL, k L w r H uwiT^wf7^si-i u a ^ 7«saoTa

"NFORMATION ATTACHMENT C-2

st>» rr Co.

JcfJCK 291

rnortmu mm Ltornars

DRILLING MUD COMPONENTS

SOHIO PETROLEUM COMPANY

Products of If1C0 Services are l i s ted In th is program Equivalent or comparable products are avai lable from NL Baroid, Magcobar and Miichem.

TRADE NAME COMPOSITION

IMCO GEL Western Bentonlte; A natural occurring element containing plates of S l l k a A alumina ( I n e r t )

IMCO SURLIFT Pre-shaped, wet processed, high density chrysot l le asbestos (a native caldum magnesium s i l i ca te )

IMCO GELEX Co-polymer of polyvinyl ace­tate ft ma I elc anhydride

IMCO FLOX Polyac ry 1a..i1de

IMCO POLY RX Proprietary blend containing modified 1ignosulfonates ft modified 1 Ignite

IMCO RD-III Proprietary blend containing modified Ugnosulfonates ft modified l i g n i t e ft chromate

IMCO C-CORR An organic f i lming amine

IMCO XO2 An Inorganic compound of the b i s u l f i t e family

IMCO BAR Mined bar i te (Ground barium su l fa te)

CAUSTIC SCDA Sodium Hydroxide

IMCO L »G L i g n i t e , ground ft ref ined

SODA ASH Sodium carbonate

for I l l u s t r a t i o n purposes, other service companies, such as

PURPOSE

Primary wall bu i ld ing , f i l ­t ra te con t r l n , ft suspending agent for water base d r i l l i n g f l u i d .

V iscos i f ier for upper-hole f lu ids

Bentonlte extender

Selective f locculant to remove d r i l l e d sol ids from mud

S tab i l i t y ft f i l t r a t e control of high temperature d r i l l i n g f lu ids

Thinner ft f i l t r a t e control for water base d r i l l i n g f l u ids

corrosion i nh i b i t o r ft oxygen scavenger

Oxygen scavenger

Weighting agent

A lka l i n i t y control

Thinner ft water loss control

Removing hardness 'caldum)

ATTACHMENT E

ENVIRONMENTAL REPORT

FOR COASTAL MANAGEMENT CONSISTENCY DETERMINATION

PLAN Of EXPLORATION

GULF OF MEXICO

AND

AIR QUALITY REVIEW

FOR

SOUTH TIMBALIER AREA BLOCK 291 (OCS-G-5645)

SUBMITTED TO:

CARY KERLIN REGULATORY SUPERVISOR

SOHIO PETROLEUM COMPANY 3639 AMBASSADOR CACFERY PARKWAY

LAFAYETTE. LOUISIANA 70508

(318/981-9483)

FEBRUARY 10, 1986

PREPARED BY:

JOHN E. CHAF"" A ASSOCIATES, INC.

REGULATORY 4 ENVIRONMENTAL DIVISION

PROJECT #86-8019

John E. Chance A Assoc., inc. ATTACHMENT F

r Table of Contents

ENVIRONMENTAL REPORT

Page

I . T i t l e Page 1

Table of Contents 11

L i s t of Figures iv

L i s t of Tables v

I I . Descr ipt ion of the Proposed Action 1

A. Trav 1 Modes, Routes, and Frequencies 3

B. Support Base and New Personnel 3

C. New Support Fac i l i t i es 4

0. New or Unusual Technology 4

E. Location of the Proposed Ac t iv i t ies 4

I I I . Descr ipt ion of the Affected Environment and Tinpacts 6

A. Physical and Environmental 6

1 . Cuwerclal Fishing 6

2. Shipping I I

3. Recreation 12

4 . Cultural Resources 13

5. Ecologically Sensi t ive Features 13

6. Existing Pipelines and Cables 14

7. Other Mineral Uses 14

John E. Chance A Assoc., Inc.

8. Ocean Dumping 15

9. Endangered or Threatened Species 15

B. Socio-Economic Impacts 17

IV. Unavoidable Adverse Impacts 18

V. Literature Cited 22

Coastal Zone Management Consistency Cer t i f i ca te 24

AIR QUALITY REVIEW

1 . T i t l e Page 26

I . General Information 27

I I . Flndlnys of Air Quality Review 27

I I I . Total Emissions at Rig/Platform 27

IV. Total Supply A Crew Boat Emissions 28

V. Total Helicopter Emissions 28

V I . Transportation Services Data 28

V I I . Factors Used 1n Calculations 29

VIII . Methodology 30

IX. References 30

John E. Chanco «£ Assoc., Inc.

LIST OF FIGURES

FIGURE Page

i — V i d n i t y Nap of South Timba, ier Area Block 291 2

J o h n E . C h a n c e & A s s o c . , Inc .

r

I I . Description of the Proposed Action

This report addresses the act iv i ty proposed by Sohlo Petroleum Company

fo r South Timbalier Area Block 291 (OCS-G-5645). The approximate locat ion

of the ac t i v i t y 1s presented in Figure 1, a general v i c i n i t y map of the

Outer Continental Shelf (OCS) lease areas o f f the coast of Louisiana.

I t Is anticipated that a semi-submersible type r ig w f l l be moved on

l o c a t i o n and three exploratory wells w i l l be d r i l l e d . The surface locat ion

of the wells and addit ional information regarding specif ic ac t i v i t i e s

proposed by Sohio Petroleum Corpany for th is block are Included in the

at tached Plan of Explorat ion.

The proposed a c t i v i t i e s w i l l be carr ied out by Soh*o Petroleum Company

w i t h a guarantee of the fo l lowing:

1. The best avai lable and safest technologies w i l l be u t i l i z e d

throughout the pro ject . This Includes meeting a l l applicable

requirements for equipment types, general project layout, safety

systems, equipment and monitoring systems.

2. All operations w i l l be covered by M.M.S. approved Oil Spi l l

Contingency Plan.

3. All applicable Federal, State, and local requirements regarding

air emissions, water qual i ty , and discharge for the prooosed

John €. Chanco «fi Anaoo^ Inc. l

MISSISSIPPI i ALABAMA

TEXAS

GAMOCN • • N H S A R M

CAST B » l » « S

JOHN E CMANCL u . S S O C . I N C

SM11 niton hnih MOSILC SOUTH

VICINITY MAP

40 80m,

ac t i v i t i es , as wel l a» any other p e m i t condit ions, w i l l be

compiled w i th .

A. Travel Modes, Routes, and Frequencies

Sohlo Petroleum Company w i l l operate out of the i r service base

f a c i l i t i e s established In Venice, Louisiana. Sohlo Petroleum Company

a n t i c i p a t e s using ona he l icopter , ona work boat, and one crew boat to

suppor t thei r South Timbailer Area Block 291 a c t i v i t y .

The helicopter w i l l t rave l to tha locat ion a tota l of ten times per

week. The crew boat and work boat w i l l traval to the location a to ta l of

f i v e times per week each.

I t 1s anticipated that the transportation vessels w i l l u t i l i z e the most

d i r e c t route from the V e n W , Louisiana service base. Because a vessel

support ing the South Timbailer Area Block 291 exploration a c t i v i t i e s , as

o u t l i n e d In >e Plan of Explorat ion, may be scheduled for other stops in the

a rea , the exact route fo r each vessel on each par t icu lar l ; *p cannot be

predetermined.

B. Support Base and Nrw Personnel

Sohlo Petroleum Company w i l l u t i l i z e support base f a c i l i t i e s

es tab l i shed In Venice, Louisiana. The Venice, Louisiana support basa Is

l o c a t e d approximately n i ne t y - f i ve miles northwest of the block.

John af. Chanco et Assoc., Ino. 3

Because helicopter and marine f a c i l i t i e s are current ly avai lable at the

serv ice base and are presently and continuously manned, no addit ional

onshore employment is expected tc be generated as a resul t of these

a c t i v i t i e s .

The In i t ia l OCS Socio-Economic Oata Base Report for the service base

f a c i l i t i e s ut i l ized by Sohlo Petroleum Company wl 11 be prepared for

subfr. sion pursuant to the speci f ic parameters to be established by the

DOI/. and scheduled to be Issued at a la te r date.

C. New Support Fac i l i t i es

The proposed explorat ion ac t i v i t i es for South Timbalier Area Block 291

w i l l not require the development of any new support f a c i l i t i e s .

0 . New or Unusual Technology

The exploration a c t i v i t i e s for South Timbalier Area Block 291 w i l l not

warrant u t i l i z i ng any new or unusual technology that may a f fec t coastal

waters.

E. Location of the Proposed Act iv i t ies

South Timbalier Area Block 291 1s located approximately n inety- f ive

mi les southeast of Venice, Louisiana and approximately sixty miles from the

V John E. Chance & Assoc., Inc. 4

Louisiana coast of Lafourche Parish. Figure 1 presents the locat ion of the

block In relat ion to the Louisiana coast, as well as the geographic

relationship between South Tinoaller Area Block 291 and the other OCS lease

areas.

John E. Chance & Assoc., Inc. 5

I I I . DESCRIPTION OF THE AFFECTED ENVIRONMENT AND IMPACTS

A. Physical and Environmental

1. Commercial Fishing

The Mississippi Delta area 1s known as the "Fer t i le Fisheries Crescent"

because 1t 1s one cf the most productive commercial f ishery grounds In the

world. As a r e s u l t , Louisiana Is t r a d i t i o n a l l y one of the top states 1n the

nation in terms of commercial f i sher ies , nhich amounted to 1,834,884,407

pounds worth $118,754,742 in 1984 and 1,£22,321,060 pounds worth

$109,765,223 in 1983 (USDC, NMFS, 1985). Ten species of f i n f i s h and

shellf ish represent 99 percent of Louisiana's commercial f ishery landings:

brown sh'imp (Penaeus aztecus), white shrimp (P. se t l f e rus ) , blue crab

(Callinectes sapidus), oysters (Crassostrea v i r g i n i c a ) . Gulf menhaden

(Brevoortia patronus). red snapper (Lutjanus campechanus). black drum

(Pogonias cromis). red drum (Sclanops oce l l a tus ) . spotted seatrout

(Cynoscion nebulosus). and striped mul let (Mugll cephalus). Al l but one of

these soecies are estuarine dependant.

The most valuable species to Louisiana are the brown shrimp and white

shrimp, which together produce by far the greatest shrimp harvest 1n the

Gulf of Mexico. Louisiana shrimp fishermen harvested 106,681,071 pounds

(heads-on) of shrimp worth $143,116,739 in 1984 (USOC. NMFS, 1985).

Although harvest data for these species are not separated for s ta t i s t i ca l

purposes, the brown shrimp dominates the Louisiana shrimp harvest, as i t is

V John E. Chanco at Assoc., inc. 6

the most abundant species in that region of the gu l f (White and Boudreaux,

1977). Both of these shrimp are estuarine dependant and have s imi lar l i f e

h i s t o r i e s , with the major differences being the time and location that the

var ious l i f e stages begin and reach the i r maximum leve ls . Generally,

spawning occurs offshore with tne resul t ing larvae migrating Inshore to

develop In estuaries. Brown shrimp spawn from November to Apri l in 30 to

120 meters of water, whi le white shrimp spawn from March to October in 8 to

34 meters (Benson, 1982). Juvenile and adul t brown shrimp migrate offshore

from May to July, and white shrimp migrate between June and November

(Benson. 1982).

The proposed petroleum a c t i v i t i e ' 'n South Timbalier f ^ Block 291 are

expected to have no impact on the harvest of brown or white shrimp since

South Timbalier Area Block 291 Is b»yond the outer l im i t s of the harvest

area fo r these species. (U.S.D. I . FKEIS. Gulf o f Mexico 1983 Visual Ko.

4 - 1 . )

The Gulf menhaden or "pogy" fishery Is Louisiana's second most valuable

f i s h e r y , accounting for 1,75',285,058 pounds worth $68,801,156 in 1984

(USOC. NMFS, 1985). Gulf menhaden spawn of fshore from mid-October through

March in 40 to 140 meters of water, with the larvae subsequently moving into

sha l low, low sal in i ty estuaries from Febrjary to May ( ren 1982). Here

in the shallow estuaries, the larvae metamorphose in to juver . les and change

from being carnivores to f i l t e r - feed ing omnlvores. The Juveniles and

subadults elgrate from the estuaries into of fshore waters from December

through Ftbrutry (Benson, 1982). The adults only r ^ r t }y venture far

o f f shore (ihese and Moore, 1977); indeed, about 93 percent of the commercial

John E. Chanco «fi Assoc., inc. 7

f i sh ing ef for t occurs wi th in ten miles of shore (USDOI. MMS, 1983). The

a c t i v i t i e s as proposed are un l ike l * to have any adverse ef fect on the

menhaden fishing as South Tlmoalier Area Block 291 l ies outside the

"Pr inc ip le Menhaden Harvest Area" (U.S.D. I . , FREIS, Gulf of Mexico, 1*23,

Visual No. 4-1).

The Eastern oyster is most abundant in the Gulf of Mexico from Aransas

Bay, Texas, to Apalachlcola Bay, Florida (Beccasio et a l . , 1982). Louisiana

oystermen landed 13,438,274 pounds of oysters worth $24,476,569 In 1984, I t s

t h i r d most valuable f ishery (USOC. NMFS, 1985). Oysters thr ive at

s a l i n i t i e s between 5 and 15 parts er thousand and water depths of 2.5 to 8

meters (Beccasio et a l . , 1982). Oysters spawn Inshore during the sumner,

and the free-swimming larvae attach and develop 1n the same estuarine

hab i t a t . The proposed a c t i v i t i e s In South Timbalier Area Block 291 are not

expected to have any impact on the oyster f ishery In Louisiana.

The blue crab ranges from Nova Scotia to Uruguay and supports, the

la rges t crab fishery In the United States (Marine Experiment Stat ion, 1973).

29,692,067 pounds of crabs worth $8,395,002 were landed in Louisiana In 1984

(USDC, NMFS, 1985). Blue crabs inhabit shallow water and can be found In

high sa l in i t y sounds, bays, and channels where they spawn from March through

November, wfth a peak from May to September (Benson, 1982). The resul t ing

planktonic larvae pass through several molts and stages before the juveni les

drop to the bottom of the estuarine nurseries, where they remain throughout

the year (Benson, 1982). The f isheries for blue crabs is un l ike ly to be

s i gn i f i can t l y affected by exploration ac t i v i t i es in th is block as i t i s

V John £. Chanco «t Aamoc, Inc. 8

of fshore of the coastal ano estuarine waters 1n which th is fishery operates.

Red snapper landings 1n Louisiana amounted to .,487,456 pounds worth

$2,479,817 1n 1984 (USDC, NMFS, 1985). Snappers are demersal predatory f i sh

that are comncn over or near banks, coral reefs and outcrops, submarine

r idges, rocks, and, especial ly offshore Louisiana, man-made structures such

as shipwrecks and offshore d r i l l i n g platforms (Benson, 1982; Hardy, 1978).

Red snapper spawn in the Gulf of Mexico from June to Mid-September, in water

depths o f 16-3/ meters, over bottoms of hard sand and shel 1 with rocky reef

areas; spawning may actually take place at the surface (Hardy, 1978).

L i t t l e or no Information Is avai lable abcut larval red snapper, but

juven i les are typically found Inshore In high s a l i n i t y (24 to 40 ppt) water

9-91 meters In depth (Benson, 1982). The proposed ac t i v i t i e s should create

a su i tab le habitat for red snapper.

The drums (Sclanidae) are one of the three most abundant famil ies of

fishes In the Gulf of Mexico In terms of biomass, and they outnumber a l l

other f a m i l i e s In the number of spedes (Hoese and moore, 1977). Three

spedes of drums are commercially Important to Louisiana. These include

black drum, red drum, and spotted seatrout. In 1984, Louisiana landed a

total o f 5,557,259 pounds of drums worth $4,290,068 (USDC, NMFS, 1985). The

red drum f ishery 1s the most va luable, accounting for 51 percent of the

total drum catch while the spotted seatrout and black drum account for espial

amounts of the remainder.

T y p i c a l l y , sdanids are evr /ha l lne species that spawn in shallow

V John E. Chanco & Assoc., Inc. 9

nearshore Gulf waters, producing larvae that enter coastal estuaries for

development (Benson, 1982; Johnson, i9?8; Hoese and Moore, 1977). Spotted

seatro- - spawn at night In deep channels and depressions adjacent to shallow

f l a t s , grass beds, and bayous In the estuary, from March to September with a

peak, from Apr i l through July (Benson, 1982). The larvae associate with

bottom vegetat ion (predominantly sea grasses) or shell rubble In channel

bottoms (Johnson, 1978). The juveni les spend at least the i r f i r s t 6 to 8

weeks on the nursery grounds, usually within SO meters of the shoreline,

unt i l l a t e f a l l when they move in to the deeper parts of the estuary (Benson,

1982). Adul t spotted seatrout rare ly leave the estuaries (Benson, 1982).

Black drum spawn from February to April in or near t ida l passes and In

open bays and estuaries \ Benson, 1982). The larvae are transported to

shallow estuar ine mashes, but may move to deeper estuarine waters or

shallow waters o f f sandy beaches as large juveniles iJohnson, 1978). Adult

migration i s largely restr icted to spring and f a l l movement through the

passes between estuaries and nearshore environments (Beccasio et a l . , 1982).

Red drum inhabit estuaries and coastal waters out to 22 kilometers from

shore, a t depths up to 40 meters (Becassio et al . , 1982). Spawning occurs

In the f a l l and winter, primari ly from September to November, and the larvae

are ca r r i e d by currents Into shallow estuaries and bays where they tend to

associate w i t h seagrasses and marshes (Johnson, 1978). They usually remain

in or near estuaries unt i l they a r t three years o l d , but some leave at the

end of t h e i r f i r s t year, migrating in to the Gulf in the f a l l (Benson, 1982).

V John E. Chance & As^oc, Inc. 10

Louisiana harvested 3,157,215 pounds of mullet worth $999,936 In 1984

(USTC. NMFS, 19850. Mullets are one of the most abundant fishes In the Gulf

of Mexico (Hoese and Moore, 1977). Mullet have been observed In Alabama

Inland as far as 607 kilometers i om the Gulf, and offshore as far as 80

ki lometers and as deep as 1.385 meters (Ben in , 1982). Mullet spawn from

October to May. and some females spawn more than once in a season (Benson.

1982). Larvae move Inshore In the spring and the juveni les are found 1n the

shallow areas of the estuar ies. Offshore movement from the estuaries occurs

during the fa l l (Beccasio et a l . . 1982).

Overa l l , commercial fishermen have benefited from the growth of the

petroleum Industry in the OCS water of the Gulf of Mexico. While

technological improvements have enabled commercial fishermen to Increase the

volume of landings, development of the petroleum ndustry has also had a

pos i t i ve Impact on f i sh ing . Because OCS petroleum development is dependent

on extensive marine vessel u t i l i z a t i o n , harbors and ports have been

improved, port access waterways have been expanded and Improved, and the

avallai/11 I ty and uuality of marina vessel maintenance and repair f a c i l i t i e s

have Increased s ign i f i can t l y . These Improvements have de f in i te l y had a

pos i t ve ef fect on fishermen (Lassl ter , 1980).

2. Shipping

A designated shipping fairway is located approximately s ixty miles

nor th of the block. I t i s l i k e l y that the marine vessels supporting th is

John E. Channe £ Assoc., Inc. l l

block Mi l l u t i l i ze the shipping fairway located north of the block to gain

access to the support base, however, I t Is un l ike ly that the marine vessels

w i l l have a s igni f icant e f f ec t on fairway t r a f f i c . The d r i l l i n g r i g and

each of the marine vessels w i l l be equipped wi th a l l U. S. Coast Guard

required navigational safety aids.

3. Recreation

The open Gulf encompasses a broad expanse of saltwater which 1s

u t i l i z e d by numerous sports fishermen aid a small but rapidly Increasing

number of SCUBA divers. Many fishermen charter boats to deep-sea f i sh and

spor t dive in the northern Gulf. The states of Alabama, Miss iss ippi , and

Louisiana support approximately 120 charter boat: which conduct a majori ty

of t h e i r fishing a c t i v i t i e s 1n the waters of the OCS (U.S.D. I . , 1983).

Petroleum platforms in the northern Gulf provide recreation for fishermen

and scuba divers because they act as a r t i f i c i a l reefs at t ract ing and

establ ish ing aquatic communities Including highly sought af ter food and

spor t f ishes. The reef e f f ec t created by petroleum platforms is well known

and i s evidenced by the numerous private boat owners who regularly v i s i t

o f f sho re fac i l i t i es to harvest food and sport f ishes.

Frequently, offshore r igs and platforms serve as navigation points for

small commercial and recreat ional marine c r a f t . Manned d r i l l i n g r igs and

p lat forms can also provide a haven for small c r a f t operators forced to

abandon their vessels during storms or following boat accld*...ts. The

i n s t a l l a t i o n and use of navigational aids, l i fesav ing equipment, and other

V John E. Chance & Assoc., Inc. 12

s a f t t y requirements pursuant to Coast Guard regulat ions are standard

procedure for d r i l l i ng Mgs ?nd marine vessels u t i l i z e d by Sohlo Petroleum

Company.

4 . Cultural Resources

Visual No. 11 from the Regional Environmental Impact Statement

(U .S .D . I . 1983) Indicates that South Timbailer Area Block 291 f a l l s beyond

the zone designated as an area with a high probabi l i ty of occurrence of

h i s t o r i c a l cultural resources, therefore. I t Is un l ike ly that any c u l t u r a l l y

s1gnif1ca.it resources w i l l be Impacted.

5. Ecologically Sensit ive Feavures

South rimballer Area Block 291 is located approximately twenty-tnree

mi les from Dlaphus Bank. There are no other known ecological ly sensi t ive

areas near South Timbalier Area Block 291.

The Venice, Louisiana support base which w i l l be u t i l i z e d as operations

base for the South Timbalier Area Block 291 explorat ion a c t i v i t i e s Is

loca te J approximately two 1,11 es from the Delta National Wil dl 1 fe Refuge,

eleven miles from the Pass A'Loutre W i ld l i f e Management Area ar.d fourteen

mi les from the Bohemia Wi ld l i f e Management Area (U.S.D.I FREIS, Gulf of

Mexico. 1983, Visual No. 3 ) .

V John €. Chance & Assoc., Inc. 13

In general I f a l l a c t i v i t i e s are executed as planned, encountering no

unusual circumstances, the environmentally sensit ive areas w i l l not be

a f f ec ted .

6. Existing Pipelines and Cables

A shallow hazards survey was performed for Sohlo Petroleum Company by

John E. Chance and Associates, Inc. and Is Included as a* attachment to the

Plan o f Exploration. This report .ndlcates near-surface faul t ing has

resu l ted In some seafloor expression within the block. Possible gas

accumulations were noted in several locations. Near-surface gas deposits

occur i n Block 291 and are presumed to be In a low pressure state. Although

the f a u l t i n g and gas accumulations may be considered possible constraints to

o i l and gas development in the area, the ef fects of these features can be

minimized by the use of ex is t ing engineering and design techniques. Sohlo

Petroleum Company Is aware of these potential hazards and has taken

necessary precautionary measures.

There an- .0 known Pipelines or man-made structures 1n South Timbailer

Area Block 291.

7. Other Mineral Uses

There are no other known mineral resources located In or near South

Tinoal ie r Area Block 291.

John E. Chanco <& Assoc.. Inc. 14

r

8. Ocean Dumping

The major sources of ocean dumping related to OCS petroleum explorat ion

a c t i v i t y are d r i l l i ng f l u i d s , or "muds," and d r i l l cut t ings. After the

exp lo ra to ry d r i l l i ng 1n South Timbalier Area Block 291 1s completed, Sohlo

Petroleum Company does ant ic ipate dumping the i r excess water-based d r i l l i n g

f l u i d s (approximately 1400 bb ls ) . I f any oi l-based mid Is used In the

d r i l l i n g operations, I t w i l l i>e transported to shore for proper disposal .

D r i l l cuttings are brought up by the d r i l l i n g mud and range In size

from grains of sand to pebbles. These cutt ings are separated and s i f t e d and

then disposed overboard. Treated domestic wastes and d r i l l waters w i l l also

be disposed at the proposed d r i l l i n g s i te . There w i l l be no Intent ional

d ischarge of any o i ly or hazardous materials In v io la t ion of DOI or EPA

regu la t i ons .

South Timbalier Area Block 291 Is located wi th in Mi l i ta ry Warning Area

W-92. Sohlo Petroleum Company 1s aware of the st ipulat ions and has f i l e d

the necessary paper work to receive clearance.

9. Endangered or Threatened Species

Endangered or threatened species which might occur In South Timbalier

Area Block 291 are blue whale (Balaenoptera musculur). finback whale

(Balaenoptera physalus', humpback whale (Megaptera novaeangliae), sel whala •

John E. Chance A Assoc., inc.

15

(Balaenoptera borea l is ) . sperm whale (Physeter catodon), Kemp's r id ley

t u r t l e (Lepidochelys kempl i ) . green t u r t l e (Chelonia mydas). hawksbill

t u r t l e (Eretmochelys imbr ica ta) , leatherback t u r t l e (Dermochelys coriacea)

and loggerhead t u r t l e (Caretta caretta) (U .S .D . I . , Region IV Endangered

Species Notebook).

Endangered and threatened species expected to occur In the v i c i n i t y of

the onshore base are bald eagle (Hal Iaeetus leucocephalus), the brown

pe l i can (Pelecanus occidental I s ) . and American a l l i ga to r (A l l igator

mississippiensis) (U .S .D . I . . Region IV Endangered Species Notebook). The

brown pelican was common resident of Louisiana but th is species became

v i r t u a l l y extinct 1n the l a te 1950's ( F r i t t s et a l . , 1983). By 1960. the

est imated Louisiana population of brown pelicans was four birds (NFWL,

1980). Re-establishment of a breeding population In Louisiana has met with

/arming success (F r i t t s et al . , 1983). The a c t i v i t i e s proposed by Sohio

Petroleum Company are expected to have no Impacts on the brown pel ican. The

American al l igator 1s c l a s s i f i e d as threatened b io log ica l ly in Louisiana and

a regulated harvest i s permitted under State Law (U.S.D. I . , Region IV

Endangered Species Notebook). The presense of marine mammal« in coastal

Louisiana Is considered sporadic and probably no resident populations ex is t .

I t I s un l ike ly that onshore or exploration a c t i v i t i e s related to South

Timbal ier Area Block 291 w i l l have any ef fect on the previously named

species.

John E. Chanco A Assoc., inc. 16

B. Socio-Economic Impacts

In accordance Mitt DO I/MMS gui del lnes (0S-7-U1). dated November 20,

1980, the i n i t i a l OCS Oata Base Report w i l l be developed for submission on

or before the prescrioed due aate. Subsequent Environmental Reports

provided by Sohlo Petroleum Company w i l l address th is data and related

a c t i v i t y Impacts as required.

V John E. Chance & Assoc., inc. 17

r IV. UNAVOIDABLE ADVERSE IMPACTS

The greatest threat to the natural environment Is caused by inadequate

operational safeguards that may cause or contr ibute to an o i l s p i l l or well

blowout. These accidents can be greatly reduced in number by u t i l i z i n g

t ra ined operational personnel and employing a l l available safet and

po l lu t i on control systems. These measures are standard operating procedure

f o r Sohlo Petroleum Company. Sohlo Petroleum Company has an approved 011

S p i l l Contingency Plan.

I t should be noted that most large crude o i l and refined products

s p i l l s have occurred during transportation and not during d r i l l i n g or

production operations, furthermore, the probabi l i ty of an o i l s p i l l

occurr ing during exploratory d r i l l i n g operations is low (Danenberger, 1976).

Transportation and r i ve r runoff contr ibute an est1ma*-*d 34.9 percent and

26.2 percent, respect ively, to the hydrocarbon contamination of the world's

oceans while offshore production a c t i v i t i e s account for only 1.3 percent

(National Academy of Sciences, 197$). Natural seeps of petroleum and

natura l *as, which occur throughout the northern Gulf of Mexico (Zo B e l l ,

1954; Geyer, 1979), cont r ibute an estimated 9.8 percent to the contamination

o f the world's oceans (National Academy of Sciences, 1975). Add i t iona l ly ,

1 t war noted In the executive summary of a recent study of petroleum

production platforms In the central Gulf of Mexico (Bedlnger, 1981), thdt

natura l disturbances ( I . e . r l v t r flooding and storms) can more great ly

a f f e c t normal bioloolcal communities that the current industr ia l development

of the Louisiana OCS. The preceding discussion is not Intended to minimize

John E. Chance A Assoc., Inc. 18

the significance of major o i l sp i l l s resul t ing from petroleum exploration

and production ac t i v i t i es but is provided to establ ish a perspective

r e l a t i v e to their probable occurrence.

Thirteen of the f o r t y - s i x blow-outs on the OCS oetween 1971 and 1978

were associated with exploratory d r i l l i n g a c t i v i t i e s , none of which released

any o i l to the marine environment (Danenberger, 1980). The IXTOC I s p i l l of

?79. however, demonstrates that advanced d r i l l i n g technology and avai lable

' a t e * / ant po lution control systems are not I n f a l l i b l e . Nost s p i l l s are

subjected to immediate containment and cleanup e f f o r t * . The ul t imate fate

of o i l spi l led In the marine environment i s generally considered to be one

or a combination of the fo l lowing: evaporation and decomposition In the

atmosphere, dispersal in the water column. Incorporation Into sediments, and

ox ida t ion by chemical or biological means (National Academy of Sciences,

1975).

The unavoidable adverse Impacts that w i l l occur as a result of the

exploratory d r i l l i ng and discharging of d r i l l i n g f l u i d s , and treated sewage

w i l l be few in number an i temporary In nature. The primary adverse impacts

Inc lude a localized degradation of water and a i r q. j l i t y 1n the v i c i n i t y of

the d r i l l i n g s i te , the potent al obstruction to commercial and recreational

f i s h i n g vessels, and the disruption and/or k i l l i n g of benthic and/or pelagic

organisms during location of the d r i l l i n g r ig and during disposal of muds,

c u t t i n g s , and domestic wastes and sewage.

John £. Chance £ 4ssoc, inc. 19

Discharging froa the d r i l l s i te is Inevi table during OCS operations,

pa r t i cu la r l y during explorat ion. Viy Materials that may contain o i l or

other hazardous material s, and therefore would have a auch greater adverse

iapact on the environment, w i l l not be discharged In ten t iona l l y . Any

discharging w i l l be done pursuant to a l l DOI and EPA regulat ions. The

discharges to bt disposed overboard as a resul t of t h t txp lorat ion a c t i v i t y

w i l l Include domestic waste and sewage that Is t r t a t t d on th t r i g before

discharging, d r i l l cu t t i ngs , and excess water-based aud.

The envlronaental fate and effects of d r i l l i n g auds and cut t ings has

been ex.enslvely addressed In a recent symposium (See Ayers et a l . , 1980 for

de ta i led discussions). The discharging of d r i l l cut t ings and water-based

mud w i l l result In an Increase In water t u r b i d i t y , bur ia l of benthic

organlsas. and possible toxic ef fects on aarine organisms In th t Immediate

v i c i n i t y of the d r i l l i n g r i g . A reduction In photosynthtt lc ac t i v i t y and

plankton populations can also bt expected as a resu l t of discharging. I t Is

expected, however, that pelagic and benthic organlsas w i l l r tpopulat t the

area rapidly after Ischarglng I f th t ef fects a r t minimal and Intermit tent

as ex pec ttc'.

Offshort ac t iv i t ies generate a small but s ign i f i can t amount of a i r

po l lu tants due to th t emissions of dlesel engines; therefore, the

deter iora t ion of a i r qual i ty Is unavoidable in an OCS operation a r te . In

most Instances, thet t emissions affect only t h t immediate exploration

a c t i v i t y s i te and ar t rapidly dissipated by t h t atmosphere depending upon

c l imat i c conditions. An Ai r Quality rJv1tw Report has been performed for

John C. Chanco tt Asaoc., Ino. 20

f

South Timbalier Area Block 291 sr.d is included as an attachment to the

Envi ronmental Report.

Commercial and recreational fishing would be aftxted by OCS

development, but primarllv in terms of inconvenience and interference.

Although the unavoidable adverse Impacts could Includt some smothering of

s h e l l f i s h , snagging of trawl nets, reduction of area presently used for

unrestricted fishing, and minimal finfish k i l l i n g , commercial fishing

a c t i v i t i e s would not be significantly effected, except in tho unlikely event

of an oi l sp i l l . An oil sp i l l would result in serious economic losses due

to the contamination of commercial fish species over a large area.

There is a remote possibility that offshore areas of h istor ical ,

c u l t u r a l , or biological significance could be damaged or destroyed by OCS

exploration operations. Visual No. 11 from the Regional Environmental

Impact Statement (U.S.O. I . , 1983) Indicates that no archeological, cultural ,

or historic areas are In the vicinity of South Timbailer Area Block 291.

Sohlo Petroleum Company will make wcry effort to avoid disturbing any

h is tor ica l ly , cultural ly, or biologically significant feature.

V John E. Chanco A Assoc.. inc. : i

LITERATURE CITED

Ayers, R. C , N. L. Richards and J . R. Gould 1980 Proceedings of a symposium. Research on environmental fate

and ef fects of d r i l l i n g f l u i ds and cut t ings. Washington, D.C. 1.122 PP.

Bedlnger, C. A. , J r . 1981 Ecological Investigations of petroleum production platforms in

the central Gulf of Mexico. Volume I I I : Executive Summary. Submitted to the Bureau of Land Management, New Orleans, Louisiana. Contract No. AA551-CT8-17. 29 pp.

Danenberger, E. P. 1976 011 s p i l l s , 1971 - 1975, Gulf of Mexico Outer Continental Shelf.

Geological Survey Circular 7 4 i . 47 pp.

Danenberger, E . P . 1980 Outer Continental Shelf 011 and Gas Blowouts. U.S.G.S. Open-File

Report. 80-101. 15pp.

F r l t t s , T. H., A. B. I r v ine , R. D. Jennings, L. A. Collum, W. Hoffman, and M. A. McGehee

1983 Turt les, b i r ds , and mammals 1n the northern Gulf of Mexico and nearby Atlantic waters, u. S. Fish and Wi ld l i fe Service. Div is ion of Biological Services, Washington, D. C. FWS/OBS-82/65. 455 pp.

Gallaway, B. J . 1981 An ecosystem analysis of o i l and gas development on the Texas-

Louisiana continental shelf. U. S. Fish and Wi ld l i f e Service, Office of Biological Services, Washington, D. C. FWS/OBS-81/27. 89 pp.

Gallaway, B. J . , L. R. Mart in, R. L. Howard, G. S. Boland, and G. D. Dennis 1981 Effects on a r t i f i c i a l reef and demersal f ish and macrocrustacean

communities. Pages "37-293 in B. S. Mlddleditch, ed. Environmental effects of offshore o i l production. The Buccaneer Gas and Oil Field Study. Marine Science, Vol . i 4 . plenum Press, New York, New York.

Geyer, R. A. 1979 Naturally occurring hydrocarbon seeps In the Gulf of Mex.co and

Caribbean Sea. College Stat ion, Texas: Texas A A M Unive-slty Press.

Hoese, H. 0. and R. H. Moore 1977 Fishes of the Gulf of Mexico. >exas A I M Univ. Press. College

Station, TX. 327 pp.

Lassl ter , R. C. 1980 The Georges Bank: f ish and f u e l , ninth annual Sea Grant Lecture,

Sea Grant Program, M.I.T., Cambridge, MA, October 23. 1980. Houston, TX. 26 pp.

John E. Chance «£ Assoc., Inc. 22

National Academy of Sciences 1975 Petroleum 1n the marine environment. Washington, D.C. 107 pp.

National F1sh and W i l d l i f e Laboratory (NFWL) 1980 Selected vertebrate endangered species of the seacoast of the

United States: Brown Pelican, eastern and Cal i fornia subspecies. U. S. F1sh and W i l d l i f e Service, Biological Services Program FWS/OBS- 80/01.40. 16 pp.

National Marine Fisheries Service 1984 Louisiana landing s ta t i s t i cs from personal communication with Lee

USIA, NMFS. New Orleans, La.

U. S. Department of the I n t e r i o r , Fish ar.d W i l d l i f e Service 1976 Endangered and threatened species of the southeastern United States.

Region IV, A t lan ta , Georgia (per iod ica l ly updated).

U. S. Department of the I n t e r i o r , Minerals Managertnt Service 1983 Final Regional Environmental Impact Statement, G i ' f of Mexico.

Vol. 1. Prepared by Minerals Management Service, Gulf of Mexico OCS Region, . e t a lHe , Louisiana. 527 pp.

Zc B e l l , C. t . 1954 Marine bacteria and fungi, Fisheries Bulletin 55 (89): 217 - 222.

V John E. Chunce et A**oc, inc. 23

APPENDIX 1

COASTAL ZONE MANAGEMEl T

CONSISTENCY CERTIFICATE

John E. Chanco £ Assoc., ino. 24

r COASTAL ZONE MANAGEMENT

CONSISTENCY CERTIFICATION

EXPLORATION

Type of Plan

SOUTH TIMBALIER AREA BLOCK 291 (OCS-G-5645)

Area and Block

The proposed act iv i t ies described In detai l in the attached Plan of Exploration comply with Louisiana's approved Coastal Management program and wi l l be conducted In a manner consistent with such Program.

Arrangements have been made wi th the State Times In Baton Rouge, Louisiana to publish a Public Notice of the Proposed ac t i v i t y no la ter than /mfi i i i r n liTT flfiTi

SOHIO PETROLEUM COMPANY

Lessee or Operator

Cer t i fy ing O f f i c ia l

John E. Chanco at Assoc., inc. 25

AIR QUALITY RE.IEW For

Sot-ln Timbalier Area Block 291 OCS-5-5645

Sohlo Petroleum Company 3639 Ambassador Caffery farkwa

Lafayette, Louisiana 70608

Submitted To Cary Kerl in

Regulatory Supervisor

February 10, 1986

* * *

Prepared by: JOHN E. C»' M.I • ASSOCIATES, INC.

Regulatory and Environmental Division Lafayette, Louisiana Project No. 86-8019

John E. Chanco A Anooc, Inc. 26

PROJECTED AIR EMISSION SCHEDULE FOR EXPLORATION PROJECT

I . General Information

Location of F a c i l i t y - South TiaOaller Area Block 291 Name of Rig/Platform - Semi-Submersible Owner/Opera tor - Sohlo Petroleum Company Address - 3639 Ambassador " a f f t r y Parkway

Lafayette, Louisiana 70508

Contact Person - Cary Kerl in Regulatory Supervisor

Project Start Date - July 01, 1986 Project End Date - Apr i l 01. 1987

Total well Footage to be Dr i l led - 32,850 ni stance Offshore - 60.0 miles

I ! . Findings of Air Qual i ty Review

As per DOI-MMS regulations th is f a c i l i t y Is exempt from further a i r qua l i t y review as U has been deternined that I ts operation w i l l not have - s ign i f i can t adverse environmental Impact on a i r q u a l i o *

I I I . Total Emissions at Rlg/Plalform

Allowable Projected Emission Emitted Emlsslc.u Emissions Statu; Substance ( tons /y r ) ( tons/yr) (OK/NG)

CO 52109.05 22.006 OX

S02 1998.0002 1.5 OX

N0X 1998.0002 137.9 OX

VOC 1998.0002 7.2 OK

TSP 1998.0002 .1 OX

John E. Chanco «ft ABBOO., Inc. 27

Total Supply A Crew Boat Emissions at Venice, Louisiana

Emitted Projected Status Substance (s) Emissions (CNG)

CO 16.7 OK

SO * *

N0X 117.03 OK

VOC 6.3 OK

TSP * *

Total Heilcopter rmissions at Venice, Louisiana

Emitted Projected Status Substance (s) Emissions (QK/NG)

( tons/yr)

CO 2.2 OK

so2 .07 OK

.2 OK

VOC .2 OK

TSP .1 OK

Transportation Services Oata

Supply Boats (3000 hp) Port - Venice, Louisiana Halting Time - 10 hrs./day Trips Per Week - 5

Crew Boats (2500 hp) Port - Venice, Louisiana Halting Time - 4 hrs. Trips Per Week - 5

John E. Chance 6 Assoc., Inc. 28

Hel icopters Base - Venice, Louisiana Trips Per Week - 10

Other (Explain) - N/A

•The EPA does not provide S02 and TSP mission factors for boats

nor does i t provide TSP emission factors for dt i l l Ing.

V I I . Factors Used l r Calculations

Emission Factors for Power Gene, at ion

Emitted D r i l l i n g Substance(s) l ib /hp-hr )

CO .0042

S02 .0019

N0X .028

VOC .00095

Emisson Factors for Helicopters and Boats

Emitted Helicopters Boats Substance(s) (lb/englne-LTO) ( l o /ga l )

CO 5.7 .0598

S02 .16

N0X .57 .4i96

VOC .52 .0226

TSP .25 *

Other Factors

D r i l l i n g Power Generation - 60 hp-hr / f t Fuel Consumption by Boats - .0959 gal/KU-hr

John E. Chmncm «ft Assoc., Ino. 29

VII! . Methodology

Rig/F'dt ->rm - horsepower-hour method Boats - hc-sepower-hour method Helicopters - landing/takeoff (UO) cycle method

IX. References

O r l l l l n g -EPA-450/3-77-026 (June 1977) - "Atmospheric Emissions From Offshore 011 Oevelopment and Production", pp. 81-92.

Boats and Helicopters - EPA Report AP-42 - "Compilation of Air Pol lutant Emission Factors", 3rd ed i t i on , (August 1977), pp. 116, 12S, 127.

* The EPA does not provide S02 and TSP emission factors for boats

nor does i t provide TSP emission factors for d r i l l i n g .

John E. Chance £ Assoc., inc. 30