taUJiJB^ - BSEE Data Center · Aita. TMs plsn includes the sctivities proposed for Wells A through 0. In accordance with 30 CPR 250.34. revised Oecerfcer 13. 1979. snd our lette dated

In Rsjply tefcr To: Septenber IT. 19S7

Texado USA Attention: ftr. A. Newton Post Office Box 60252 mm Orleans, Louis teas 70160

Gaatlâsn:

Reference fs aade to your Initial Plen of Exploration and Envlromsent*) Reoort received Septesber 3. 1987, for Uase OCS-6 717*. Blocs A-10. Mustang Island Aita. TMs plsn includes the sctivities proposed for Wells A through 0.

In accordance with 30 CPR 250.34. revised Oecerfcer 13. 1979. snd our lette dated January 29. 1979. this plaa 1s hereby dete rained to be cosflete snd 1s now being considered fer approvsi.

Tour plan coat rol nuaber 1s N-2732 and sliould be referenced io your coasnunica tion snd correspondence concerning this plaa*

Sincerely yours.

(Ori*. Sgd.) A. Donald Giroir

fr. Bourgeois 3 * Regions! Supervisor

- Field Opemtions

bcc: tease OCS-G 7175 (OPS-3-2) (FILE ROOM/ ( ^S-3HI,w/Puh11c Iafo. Copy of the plan snd ER (PUBLIC RECORDS)

ADGobert; eck: 9/09/87 :poeco«

taUJiJB^ IS.K1 nil BI«S

muam

Texaco USA PO Box 60252 New Orleans LA 70160

August 17,| 1987

Regional Superv i sor F i e l d Operations Minera l s Management S e r v i c e 1201 Elmwood Park B l v d . New Orleans, L o u i s i a n a 70123-2394

261971 - FEDERAL LEASE OCS-G 7175 MUSTANG ISLAND BLOCK A-10 OFFSHORE TEXAS PLAN OF EXPLORATION AND ENVIRONMENTAL REPORT

Dear S i r :

In accordance with the provisions of Title 30 CFR 250.34-1, and your letters of January 29, 197S, and October 22, 1981, we hereby submit for your approval nine copies each of a Plan of Exploration with Environmental Report for federal lease OCS-G 7175, Mustang Island Area, Bloclc A-10. Should any additional information be required, please contact Mr. D. F. Cramer by telephone at (504) 595-1249.

Your early approval of this plan w i l l be appreciated.

Yours very truly,

TEXACO PRODUCING INC.

DFC tdw POE/2 8/17/87

Attachments

PLAN OF EXPLORATION TEXACO PRODUCING INC.

FEDERAL LEASE OCS-G 7175 MUSTANG ISLAND BLOCK A-10

AUGUST, 1987

TABLE OF CONTENTS I

PAGE

EXPLORATION P

Description of and Schedule

for Exploration A c t i v i t i e s

Description of Rig and Safety Equipment

Geophysical Equipment

Location of Proposed Wells

Current Subsurface Interpretation

O i l Sp i l l Contingency Plan

Onshore Support Bases

D r i l l i n g Mud Components and Mud Additives . . . .

Projected Air Emissions Report

D r i l l i n g Hazarda Assessment

Archaeological Assessment

Lease Stipulation

Environmental Report and Air Quality Reviev

Deacription of the Proposed Action

Deacription of the Affected

Environment and Impacts

Unavoidable Adverse Impacts

References 12

Coaatal Zone Managemant Consistency C e r t i f i c a t i o n 13

Appendix

PLAN OF EXPLORATION

TEXACO PRODUCING INC.

FEDERAL LEASE OCS-G 7175

MUSTANG ISLAND BLOCK A-10

Description of and Schedule for Exploration Activities

Texaco Producing Inc.'s \ploration plan for Mustang Island Block

A-10 includes the dr i l l i n g and completion of up to four (4)

exploratory wells to evaluate federal lease OCS-G 7175 for

development. The f i r sr. well i s scheduled to commence on or about

November 1, 1987. The commencement dates for the remaining wells

have not been scheduled. Operations for the four (4) wells are

expected to last approximately 432 days.

Description of Rig and Safety Equipment

Depending on the availability of rigs, the proposed wells w i l l be

d r i l l e d with a jack-up drilling rig similar to the "Penrod Rig

No. 88." Included in the Appendix are the rig specifications for

the "Penrod Rig No. 88." The specifications for the actual

d r i l l i n g vessel and safety equipment to be used w i l l be submitted

along with the appl. 'ation for permit to d r i l l . The rig used to

d r i l l the exploratory wells under this plan w i l l contain and

maintain a diverter system, blowout-preventers, auxiliary

equipment, and mud testing and monitoring equipment. Drilling

operations will be conducted in a manner so as to maximize

p o l l u t i o n prevention i n accordance with OCS Order No. 7. A l l

o ther safety] and contro l equipment w i l l be used in accordance r

w i t h other applicable OCS Orders.

Should a well indicate the presence of commercial reserves, the

w e l l w i l l be temporarily abandoned in accordance with OCS

Order No. 3.

Geophys,ical Equipment

A l l geophysical work pr ior to the commencement of exploratory

d r i l l i n g operations has been completed. No other geophysical

work i s presently planned for the l ease . I f i t i s subsequently

detennined that addi t ional wor^ i s required, conventional CDP

r e f l e c t i o n methods w i l l be used.

Locat ion of Proposed Wells

Inc luded in the Appendix i s a V i c i n i t y Map and Location P l a t .

The V i c i n i t y Map shows the location of Mustang Is land Block A-10

r e l a t i v e to tho Texas shoreline. The Location Plat provides the

sur face and bottom hole locations, proposed to ta l depth for each

w e l l , and the water depth at each surface location.

Current Subsurface Geologic and Geophysical Interpretation

Included in the Appendix ar« the subsurface structure map and the

geologic cross sect ion which r e f l e c t the current subsurface

interpretat ion of the geologic and geophysical data in the area.

These data are considered confidential by Texaco Producing Inc .

- 2 -

and ahould be exempt from disclosure under the Freedom of Infor

mat ior Act 5 U.S.C. 552. These data are intended for use by 1

authorized Minerals Management Service personnel only.

Qil S p i l l Contingency Plan

In accordance with OCS Order No. 7, Texaco Producing Inc. has on

f i l e with the Minerals Management Service an Oil S p i l l

Contingency Plan which has been approved by the Minerals

Management Service by letter of August 27, 1986.

Texaco Producing Inc. i s a member of Clean Gulf Assoc 'ates (CGA)

and, as such, hat accesa to a stock-pile of o i l s p i l l containment

and clean-up materials for use in the offshore and estuarine

areas. There are several CGA bcsas which are stratsgically

located along the Texas, Louisiana and Florida coastlines of the

Gulf of Mexico that have the personnel, material and equipment

necessary to control and clean up o i l s p i l l s . The closest CGA

base at Rockport/Fuiton, Texas, i s within 50 miles of the

proposed d r i l l sites. Based on the distance from this CGA

installation to the proposed d r i l l s i t e s , we estimate a travel

and deployment time of approximately seven (7) hours.

Onehore Support Bases

Two onshore bases w i l l be used to support the proposed

operations; one in Corpus Christi, Texas and the Texaco dock at

Morgan City, Louisiana. From these bases personnel, supplies and

- 3 -

mater ia l s w i l l be transported by boat to the proposed d r i l l

s i t e s . Additionally, personnel may be transported to and from

the d r i l l s i tes by hel icopters which are based at Petroleum

Helicopter, I n c . ' s f a c i l i t i e s at Amelia, Louisiana and Morgan

C i t y , Louisiana.

D r i l l i n g Mud Components and Mud Additives

Included in the Appendix are l i s t i n g s of the d r i l l i n g mud com

ponents and mud addit ives which are normally used during d r i l l i n g

operations.


The projected a i r emissions report, which i s included in the

Appendix, re f l ec t s the estimated emissions of t o t a l suspended

p a r t i c l e s (TSP) , s u l f u r dioxide (SO.,) , nitrogen oxides (NO ) ,

carbon monoxide (CO) and vo la t i l e organic compounds (VOC) for a

432 day period of continuous operations. Upon comparison of the

estimated emissions to the emissions calculated using the

exemption formulas, i t was determined that the proposed

exploration a c t i v i t i e s were exempt from further a i r quality

review. Based on these data, i t has been determined that these

planned ac t iv i t i e s w i l l not cause any s ign i f i cant e f f ec t on the

a i r qual i ty of the onshore areas.

- 4 -

Drillinq Hazards and Archaeoloqical Assessment

An archaeological hazards survey was conducted over Mustang

Island Block A-10. The data collected from this survey included

magnetometer,|side scan sonar, sparker and pinger profiles.

These survey data along with avaixable CDP seismic and velocity

profiles were reviewed to evaluate the proposed d r i l l sites for

potential drilling hazards.

The information below relates to data collected irom the

following d r i l l site locations on Block A-10:

"A" % 3900' FSL & 8000' FEL of Blk. A-10;

"B" @ 6600' FSL & 6500' FWL of Blk. A-10;

"C" % 51501 FNL & 3100' FWL of Blk. A-10; and,

"D" 8 47001 FSL & 5000' FEL of Blk. A-10.

At Location "A" the water depth i s 234 feet. The sea-floor i s

f l a t and slopes to the southeast at an approximate rate of 7.5

feet per mile. There were no anomalous bathymetric features,

such as outcrops or scarps, noted. Near surface bedding i s

parallel.

Evidence of near surface faulting i s observed near the well site.

The nearest fault i f 800 feet from the location down to the

northwest. The well bore w i l l not intersect shallow faulting.

- 5 -

Shallow "bright spots" are not observed in the v i c i n i t y of the

proposed location. Another indicat ion of a shallow hazard i s 4 r

ferrous debris anomalies with the closest being 3300 feet

northeas^: and having a signature width of 60 feet. An inactive

gas blow hole i s 950 feet north of the location. CDP velocity

data indicates no shallow gas.

At Location "B" the water depth i s 230 feet. The sea-floor i s



such as outcrops or scarps, noted. Near surface bedding i s

parallel.



northwest. The well bore w i l l not intersect shallow faulting.

Shallow "bright spots" are not observed in the vicinity of the

proposed location. Another indication of a shallow hazard is 4


southeast and having a signature width of 60 feet. CDP velocity


At Location "C" the water depth i s 223 feet. The sea-floor i s


feet per mile. There were no anomalous bathymetric features.

- 6 -

I

such as outcrops or scarps* noted. Near surface bedding is

parallel. \

Evidence oj near surface faulting i s observed near the well site.

The nearest fault i f 800 feet from the locaticn down to the

southeast. The well bore w i l l not intersect snailow faulting.


proposed location. Another indication of a shallow hazard i s 4


northeast and having a signature width of 40 feet. An inactive

gas blow hole i s 800 feet west of the location. CDP velocity


At Location "D" the water depth i s 237 feet. The sea-floor i s



s . as outcrops or scarps, noted. Near surface bedding i s

par a l l e l .



southeast. The well bore w i l l not intersect shallow faulting.


proposed location. Another indication of a shallow hazard i s 4


- 7 -

northeast anc hav ing a s ianature < i d t h o f 60 f e e t . An i n a c t i v e

gas b lov hole i s 27C0 f ee t west o f the l o c a t i o n . CDP v e l o c i t y t

data indica tes no shallow gas.

Archaeologica l Assessment

There are no known archaeologica l o r c u l t u r a l resources l o o t e d

on Mustang I s l a n d Block A-10. *»*;e probabi] I t y o f occurence a/.*

recovery of an a rchaeo log ica l resource a t the proposed d r i l l

s i t e s i s minuscule . Lease S t i p u l a t i o n

Texaco Producing I n c . w i l l comply w i t h the p r o v i s i o n s o f Lease

S t i p u l a t i o n No. 2 - B i o l o g i c a l and No. 3 - M i l i t a r y Warning Area.

DFC: tdw TOE/2 8/13/87

r

I ENVIRONMENTAL REPORT

AND

AIR QUALITY REVIEW

FOR COASTAL MANAGEMENT CONSISTENCY DETERMINATION

BY THE STATE OF LOUISIANA ON OPERATIONS

PROPOSED IN THE

PLAN OF EXPLORATION FOR

GULF OF MEXICO LEASE OCS-G 7175

MUSTANG ISLAiiD BLOCK A-10

AUGUST 1987

Prepared by?

Vincent F. Cottone, P .E .

Texaco Producing Inc.

Post Office Box 60252

Now Qrltans, LA 7C160

(504} '195- .»71

DESCRIPTION OF PROPOSED ACTION

T h i s report addresses the act ,v i t i e s prcposed by Texaco Producing

I n c . (Tpjl) for Mufctaag Island Block A-10 (O^s-G 7175). The ap

proximate location of the proposed a c t i v i t y i s presented in

F igure 1, a general v i c i n i t y map of the Outer Continental Shelf

(OCS) lease areas.

Tt i s anticipatel tacit, a jack-up d r i l l i n g r i g w i l l be moved on

the lease and four (4) explore:ory wel l s w i l l h * d r i l l e d . The

sur face location of the wells aid addit ional information regard

ing speci f ic a c t i v i t i e s proposed by TPI for th is block are i n

cluded in the Plan of Exploration (POE) to which t h i s report i s

attached.

The proposed a c t i v i t i e s w i l l be carr i ed out by TPI with a guaran

tee of the following:

1. fhe y*et a / a i l a b l e and safest technologies w i l l be u t i l i z e d

throighout tiie p r o j e c t . This includes meeting a l l applicable

rftqui remoii'-a for equipment types, general project layout,

p.af aty syswO»as, equipment and monitoring systems.

2. A l l operations w i l l be covered by a Minerals Management

Service (MMS) approved O i l S p i l l Contingency Flan.

DRAWING NOT TO SCALE

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

ing air emissions, water quality, and discharge for tha pro

posed activities, as well as any othr- permit conditions.

lr addition to the c r i l l i n g rig, service boats and helicopters

w i l l be used to transport equipment, material, personnel, and

su*=- ;S to the d r i l l s i t * . TPI w i l l operate the service boat:*

SUs cC support base f a c i l i t i e s in Morgan City, Louisiana and

corpus Christi, Texas. I t i s estimate that the service boats

w i l l make three (3) to four (4) trips each week from the Texas

shorebase r.ad one (1) trip each week from the Louisiana shore-

base, helicopter flights to the area wil l average one (1) trip

per week and wiT.l originate from and return to Petroleum

Helicopt.ars, Inc. ! s f a c i l i t i e s at Amelia, Louisiana.

I t i s anticipated that the transportation vessels w i l l utilize

the most direct routes from their po.\nts of rrigln. However,

because a vessel supporting the proposed exploration activities

ir^y be scheduled fo* other scops in the area, the exact route for

each vessel on each particular trio cannot be pr--determined.

A. Travel Vadas. Routes, and Frequencies

2

B. Support Facilities and New Personnel

\

The proposed a c t i v i t i e s w i l l use two (2) ex is t ing support bases,

one | n Corpus C h r i s t i . Texas and the TPI dock at Morgan Ci ty ,

Louisiana. The proposed a c t i v i t i e s w i l l not require any expan

sion to these f a c i l i t i e s . The proposed a c t i v i t i e s w i l l be accom

plished using existing employees and contract personnel. No new

employment i s expected to be generated as a resu l t of these

a c t i v i t i e s .

C. New Support Facilities

No new support f a c i l i t i e s w i l l be required.

D. New or Unusual Technology

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

E. Location of the Proposed Activit ies

The Mustang I s l a n d area exploration a c t i v i t y i s located approxi

mately thirty-seven (37) miles o f f of the Texas coast. Figure 1

shows the location of Block A-10 i n re la t ion to the Gulf coast,

as well as the geographic re lat ionship between Mustang Is land

Block A-10 arc the other OCS leases areas.

3

DESCRIPTION OF THE AFFECTED ENVIRONMENT ANO IMPACTS

A. Physical and Environmental i

r

Commercial Fishing

Mustang Island Block A-10 i s located approximately 37 miles

from shore where the water depth i s approximately 230 feet.

This location i s within the limits of the major finfish

harvest area and inside the brown shrimp harvest area

(U.S.D. I. , FEIS, Gulf of Mexico, 1986, Visual No. 2). The

placement of a drilling rig on Block A-10 w i l l remove a

portion of the waters from use by commercial fisheries and

provide the possibility of fishing gear conflicts. Addition

ally, the waters adjacent to the d r i l l sites may become

temporarily turbid due to d r i l l i - v operations. These oper

ations should have no significant impact on commercial

fisheries.

Shipping

Mustang Is land Block A-10 i s f ree of any designated shipping

fairway or anchorage area. The nearest shipping fairway i s

approximately 3 miles to the northeast ( U . S . D . I . , F E I S , Gulf

of Mexico, 1986, Visual No. 3 ) . I t i s l i k e l y that marine

vesse l s supporting the proposed a c t i v i t i e s w i l l u t i l i z e t h i s

fairway to gain access to the support bases. However, i t i s

un l ike ly that the marine vesse l s w i l l have a s ign i f i cant

e f f e c t on fairway t r a f f i c . A l l marine vessel operations w i l l

be -in accordance with the U.S. Coast Guard's regulations re

garding navigation standards and the drilling rigs and each >

matfine vessel w i l l be equipped with a l l U.S. Coast Guard

reojuired navigational safety aids.

Small Craft Pleasure Boating, Sport Fishing and Recreation

The activities propose" in the accompanying POE are primarily

confined to Mustang Island Block A-10, which i s about 37

miles from the Texas coast and has a water depth of approxi

mately 230 feet. Many fishermen charter boats to deep-sea

f i s h and sport dive in the northern Gulf. Petroleum plat

forms 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

attracting and establishing aquatic communities including

highly sought after food and sport fishes. The reef effect

created by petroleum platforms i s well known and i s evidenced

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

shore f a c i l i t i e s to harvest food and sport fishes.

Frequently, offshore rigs and platforms serve as navigation

points for small commercial and recreational marine craft.

Manned drilling rigs and platforms can also provide a haven

for small craft operators forced to abandon their vessels

during storms or following boat accidents. The installation

and use of navigational aids, lifesaving equipment, and other

safety requirements pursuant to Coast Guard regulations are

standard procedure for drilling rigs, production platforms,

and marine v e s s e l s u t i l i z e d by TPI . No adverse impacts on

pleasure boating, sport f i s h i n g , or recreation are a n t i c i -i

pated as a result of these proponed activities.

4. Cultural Resources

There are no known cultural resources located in Block A-10.

Visual No. 4 frora the Final Environmental Impact Statement

(FEIS) (U.S.D.I., 1986) indicates Mustang Island Block A-10

i s located outside the U.S.D.I. designated historic and

prehistoric cultural resources high probability lines. The

geohazards survey conducted on Block A-10 indicates four

undentified magnetic anomalies were detected. Attempts to

identify the point source proved inconclusive. The contacts

are presumed to represent a minor amount of ferrous debris

buried below the mudline or too small to be acoustically

detected. Therefore, no impact on cultural resources i s

expected.

5. Ecologically Sensitive Features

There are no known ecologically sensitive features located on

Mustang Island Block A-10 (U.S.D.I., FEIS, Gulf of Mexico,

1986, Visual No. 3). The nearest sensitive feature i s the

Southern Bank located approximately one and one half (1.5)

miles to the southeast of Block A-10. The proposed

operations should have no impact on this feature.

- 6 -

\

The onshore support bases w i l l necessitate the passage of

marine vessels, and helicopter t r a f f i c . These operations w i l l i f

have only minimal impact on the Louisiana shoreline.

I 6. Existing Pipelines and Cables

There is no evidence of any cables or pipelines being located

on Mustang Island Block A-10.

7. Other Mineral Uses

The a c t i v i t i e s proposed for Mustang Island Block A-10 w i l l

have no impact on other mineral uses.

8. Ocean Dumping

The major sources of ocean dumping related to OCS hydrocarbon

exploration a c t i v i t i e s are d r i l l i n g muds and d r i l l cuttings.

D r i l l cuttings are brought to the surface by the d r i l l i n g

mud. These cuttings are separated and disposed of overboard.

After the exploratory d r i l l i n g i n Mustang Island Block A-10

i s completed, TPI anticipates dumping i t s excess water-based

d r i l l i n g f l u i d (estimate 1000 bbls.). I f any oil-based mud

i s used, i t w i l l be transported to shore f o r proper disposal.

Treated domestic waste, d r i l l water, kitchen, and other

wastes w i l l also be disposed of at the proposed d r i l l s i t es.

There w i l l be no intentional discharge of any o i l y or hazard

ous materials i n v i o l a t i o n of MMS or EPA regulations.

- 7 -

Endangered or Threatened Species

Federally l i s t e d endangered or threatened species which might i

occur i r i the Mustang Isiand Area are the f i n whale, humpback

whale, j-ight whale, sei whale, sperm whale, Kemp's ri d l e y

t u r t l e , green t u r t l e , hawksbill t u r t l e , leatherback t u r t l e ,

and loggerhead t u r t l e (U.S.D.I., FEIS, Gulf of Mexico, 1986,

p 111-32). Of the whale species, the sperm whale i s perhaps

the most common i n the Gulf of Mexico. Generally, these

whales inhabit the waters of the continental slope and the

deep oceanic waters. The other species of whales may be con

sidered uncommon i n the Gulf. The leatherback t u r t l e i s

believed to prefer the deeper oceanic waters while th*% other

species may be considered more coastal i n nature. However,

i t i s possible t h a t any of these t u r t l e species may occur i n

the project area at one time or another. L i t t l e or no impact

i s expected to any of these threatened or endangered species

by the proposed a c t i v i t i e s .

The only fe d e r a l l y l i s t e d endangered or threatened species

expected to occur i n the v i c i n i t y of the Louisiana onshore*

base i s the bald eagle (U.S.D.I., FEIS, Gulf of Mexico, 1986,

Visual No. 2). AAso, the American a l l i g a t o r , which occurs

generally through the Gulf coast, i s l i s t e d i n Louisiana as

"threatened by s i m i l a r i t y of appearance". The bald eagle

inhabits the area from Morgan City, Louisiana east and north

t o the Mississippi River. No federally l i s t e d endangered

I

plant -species are known t o occur i n the Louis iana coas ta l

area.

I

The FE S f o r lease sales 110 and 112 (U.S.D.I., 1986) d i s

cusses the occurrence and impact on endangered or threatened

species. The impacts discussed are p r i m a r i l y based on the

occurrence o f o i l s p i l l s . The impacts on various endangered

and threatened species w i l l depend on the nature of the

s p i l l , weather conditions, p r o x i m i t y o f the s p i l l t o the

species, tolerance of the species f o r o i l , and the response

time and eff e c t i v e n e s s of the s p i l l cleanup and containment

servi- *hese v a r i a b l e s , the impact on the various

enda.^c^^ cnreatened species w i l l vary from no e f f e c t t o

serious.

The experience of o i l and gas ex p l o r a t i o n i n the Gulf of

Mexico i n d i c a t e s t h a t there i s a small p r o b a b i l i t y of occur

rence of an o i l s p i l l . The p r o b a b i l i t y remains low because

o f the l e v e l o f technology used by the i n d u s t r y t o insure

safe and responsible operations. TPI, as a prudent operator,

w i l l take the necessary measures tc reduce the p r o b a b i l i t y of

o i l s p i l l s . Towards t h i s , TPI w i x l comply w i t h OCS Order No.

7 on p o l l u t i o n n and c o n t r o l , and has an approved

O i l S p i l l Cont on f i l e w i t h the MMS. I t i s un

l i k e l y that the v .JU.: :r onshore a c t i v i t i e s r e l a t e d t o the

Mustang Island Area e x p l o r a t i o n d r i l l i n g a c t i v i t i e s w i l l have

- 9 -

any e f f e c t oc the federa l ' . j l i s t e d e. ac.agei sd or threatened

specji.es. r

I B. Socio-Economic Data

I n accordance w i t h MMS guidelines, the i n i t i a l OCS Socio-Economic

Data Base Report f o r the suppcrt base f a c i l i t i e s u t i l i z e d T r i

w i l l be prepared f o r submission pursuant t o the s p e c i f i c parame

t e r s t o be established by the MMS a t a l a t e r date.

UNAVOIDABLE ADVERSE IMPACTS

The greatest t h r e a t t o the environment would be caused by an o i l

s p i l l or v e i l blowout. These occurrences can oe reduced i n

number by u t i l i z i n g t r a i n e d personnel, adequate operational safe

guards, and employing avai l a b l e safety and p o l l u t i o n c o n t r o l

systems. These measures are standard operating procedure f o r

TPI.

The unavoidable adverse impacts t h a t w i l l occur as a r e s u l t of

the proposed e x p l o r a t i o n d r i l l i n g w i l l be few i n number and tem

p o r a r y i n nature. The primary adverse impacts are a l o c a l i z e d

degradation of water and a i r q u a l i t y i n the v i c i n i t y of the

d r i l l i n g s i t e , the p o t e n t i a l o b s t r u c t i o n t o commercial and re

c r e a t i o n a l f i s h i n g vessels, and the d i s r u p t i o n and/or k i l l i n g of

b e n t h i c and/or p e l a g i c organisms during the l o c a t i o n o i the

- 10 -

d r i l l i n g r i g and during the disposal of muds, cuttings, domestic

wastes, and treated sewage. i

r

The discharge) of d r i l l cuttings and water-based muds w i l l result

i n an increase i n water t u r b i d i t y , b u r i a l of benthic organisms,

and possible toxic e f f e c t on marine organisms 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 . A reduction i n photosynthetic

a c t i v i t y and plankton population can also be expe-*- as a result

of discharging. However, i t i s expected that the pelagic and

b'*;ithic organisms w i l l repopulate the area rapidly after dis

charges end.

The proposed a c t i v i t i e s w i l l generate a small amount of a i r pol

lutants due to the emissions from the diesel engines; therefore,

some deterioration i n air quality of the CKJS oper.?" ion area i s

expected. These emissions affect only the :*n.T«diate a c t i v i t y

-•:te and are rapidly dissipated by the atmosphere. A Projected

A i r Emissions Report has been prepared for the propcsed a c t i v i

t i e s and i s included i n the Appendix to the POE to which t h i s

Environmental Report i s a part.

Commercial and recreational fish i n g could be affected by the pro

posed a c t i v i t i e s , mainly i n terms of interference. Although the

unavoidable adverse impacts could include some smothering of

s h e l l f i s h , reduction of the area presently available for unre

s t r i c t e d Wishing, and minimal f i n f i s h k i l l i n g , f i s h i n g a c t i v i t i e s

would not be s i g n i f i c a n t l y affected.

11

R E F E R E N C F S

1. United States Department of the I n t e r i o r , Minerals Management

Service, F i n a l Environmental Impact Statement, Gulf of

Mexico, December 1983.


Service, F i n a l Environmental Impact Statement, Gulf of

Mexico, December 1984.

3. United States Depar tme i t of the I n t e r i o r , Minerals Management

Service, F i n a l Envi ro omental Impact Statement, Gulf of

Mexico, November 1985.


Service, Final Environmental Impact Statement, Gulf of

Mexico, November 1986.

VFC pdm ORC/E3E 081287

12

COASTAL ZONE MANAGEMENT CONSISTENCY CERTIFICATION

Exploration Type of Pian

Mustang Island Block A-10 Area and Block

OCS-o 7175 Lease Number

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 wit h Louisiana's approved Coastal Zone Management Program and w i l l be conducted i n a manner consistent with such Program.

Arrangements have been made witii the State-Times in Eaton Rouge, Louisiana to publish a public notice of the proposed activities no later than A <*•—•> J> *s

Texaco Producing Inc Lessee or Operator

f - I f - T l Date

APPENDIX

Rig Specifications for "Penrod Rig No. 88"

Vicinity Map

Location Plat

Subsurface Structure Map

Geologic Cross Sections

Drilling Mud Components

Mud Additives


f RIG SPECIFICATIONS POR

i PENROD RIG NO.-88

EQUIPMENT INVENTORY

DRXLT:?:G JNIT - PENROD 88

Thm Ksjra-ho^ ?eTourneau Cantilevered Substructure Jack-Cp i s a trianTviar shaped hull witii three legs and cylindrical poir.ted spud cans. The hull i s raised and lowered by elesTrically driven rack and pinion gears. The platfora ifj .aêd by the American Bureau of Shipping as a Self-KUr.-.ti«g Dri l l ing Unit.

gHBtfcSI VESSEL DIMENSIONS;

f Huil Length — —•• • — 20? f t . Hull 3r»sadth —— • • — • • • 176 f t . Depth o;f Bull • • — • — • ••• 20 f t . Gear Rac* Height •••••••• ——»— »«—~—— •- 24 f t . Overall Liingth of Spud Lags •—• 360 f t . Aft Spud Centers •• • • 122 f t . Centerline of Aft Spuds to Centerline of Bow Spud ——- 120 f t . Design Water Depth (Non-Hurricane with 25' penetration) 250 f t . Rated DrilX&ar Depth • • • — • 000 f t . See Attached Orid for Cantilever Capacities

feXOOXP 6 DRV SrORAGS C&PACITISS;

Drir . Watfir • ••• • ••• • < • • 3,120 bbla. Fresh Watar ————,~ 982 bbls. Fuel Oil • • • • - 1,953 b b l s . Bulk Mad/Cement •• ••• — (4)—1,925 cu. f t . tanks Liquid Mud — • • •••• " - 1,200 bbis. CRAN2S4

Three Marathon LeTourneau Series PCM-120 AS, 45 Tons at 25 feet, boos length IJO feet.

QUARTERS t •

Kir conditioned accommodations for 72 men; two galleys mess halls; f ive bed hospital.

Page .1

c

f

DRILLING OHZT - PENROD 88

HELIPORT: '

Sikorsky S-61 capacity or equal

DRAWWORKS:

National I320-OE Drawworks with 20,500 feet capacity of 9/16 inch sandline, emergency rotary drive and a Baylor Model 6032 Eddy Current Brake, Drawworks driven by two D-79 electric motors rated at 2000 hoisting *HP.

POWER;

Three EMD MD 12SS diese l engines. Each engine i s rated at 16S0 continuous HP and drives a 1050 KW 600 v o l t AC generator.

F ive Baylor b a s i c •Thyrig I I " units are uaed to Supply DC power for d r i l l i n g equipment.

MUD PUMPS;

Two National Model -12P-160 Triplex Mud Pumps.. Each independently dr iven by two EMD D-79 e l e c t r i c motors rated at 1600 HP and supercharged by e l e c t r i c driven 5* r"6" centr i fugal pumps.

DgRRXC*, SUBSTRUCTURE AND ACCESSORIES;

Derricks Service 147' high x 30' wide derrick with a s t a t i c hook load capacity of 1,044,000 lbs . with 12"

- l i n e s strung. One hundred (100) MPH wind load capaci t y with 180 stands of Ah' O.D. d r i l l pipe. National "type 760-F, 538 ton capacity Crown Block with seven •60" diameter sheaves grooved for 1-3/3" wire l i n e .

Adjustable casing stabbing platform.

Two 2G ton hoists ins ta l l ed below the substructure f e r handling the B.O.P. equipment.

TRAVELING BLOCK;

National Tupe 660-H-500, 500 tone traveling biock with e - « 0 " diameter sheaves grooved for 1-3/8" wire l i n e .

HOOK:

National Type H-500, SOO ton capacity.

Page 2

•

i

f

DRILLIN j; UNIT - PENROD 38

National Typa P-650, 650 ton capaci ty .

ROTARY EQUIPMENT;

National Type C-375 rotary with 37%" table opening independently dr iven by an EMD 0-79 e l e c t r i c motor through a National two speed transmission. Baash-Ross drive bushing. Baash-Ross Kelly bushing with wiper assembly.

MUD MIXING;

Two 6" x 5 c e n t r i f u g a l mud mixing pumps. Each pump driven by a 100 BP AC e l ec tr i c motor.

MOD STSTEM:

Three 400 bbl . capaci ty l iquid mud tanks and one : 00 b b l . capacity s lug tank. A i l ac t ive mud tanks equipped v i t h Brandt Model MA-20 mud ag i ta tors . One P10C03 Swaco Desander Unit with three 10" cones. One PQ4C16 Swaco Desilter Unit with sixteen 5* cones. One . Brandt high speed Dual Shaker.

PRILL 'PIPS AND DRILL COLLARS:

9,765 f t . o £ ' 4 V O.D. 16.60#/ft. Grade E , Range 2 O r i l l Pipe with 6%" O.D. x 4%" XS T . J .

4*,960 f t . of 4k" O.D. 2;o.00#/£fc. Grade C, Range 2 D r i i l Pipe with « V 3.0 . x 4h* XH T . J .

24 - 7" O.U. d r i l l c e l l a r s 30' long.

12 - 8"-0.D. d r i l l c o l l a r s 30 • long.

1 - Kelly 5*" HEX by 2-3/16" bore by 40' long with 4%* I . P . RB pin .

1 (pair) Baash-Ross ST-60 rotary tongs 3%- to 11-3/4" range.

2 - Byron-Jackson Type GG d r i i l îpe elevators for 4Jj" 0.0. d r i l l p ipe.

1 - Baash-Ross 6-3/4" - 8%" d r i l l c o l l a r s l i p .

Page 3

ORXLLINfS ONIT - PENROD 88

BLOWOUT/ PREVENTERS;

One Hydril 21%" - 2000 psi W.P. type MSP; One Hydril 13-5/8" - 10000 psi W.P. typa GL; Two Cameron 13-5/8" 10000 psi W.P. type "a" doubles;. One 10QOO-psi W.P-choke manifold with two hand adjustable chokes; and One Swaco automatic choke with remote controls. (Note rental on Swaco automatic choke to be paid by Texaco.) Blowout preventers and choke manifold treated for B3S service. Blowout preventers and choke manifold to be installed to Texaco's specifications in accordance with the attached drawing or other mutually approved plans.

Blowout preventer control unit i s a Koomey Mode'. ET25160-3BTM, .2,000 psi W.P. accumulator system.

COMMUNICATIONS EQUIPMENT t

S5: Channel 25 watt VHF/FM Marine Transceiver 1 350 watt FM Transceiver 6 -2 Channel VHF portable radios 1-100 watt FM Transceiver 1 - Inner Communication Systea with stations strategically located.

SPECIAL EQUIPMENT; *

1. Baash-Ross Pover S l ips with BH" s l i p bodies and 4Jj" s l i p i n s e r t s .

c •

2. ' Automatic D r i l l e r .

3. Mud-Gas Separator.

4. Dr i l l ing Recorder. * . 5. Dual mud l i n e s complete with dual sandpipes and

3" x 60" - 10000 p s i test rotary

6. Halliburton HT-400 cement unit with rec irculat ing * mixer driven by two EMD .0-75 e l e c t r i c motor.

. 7 . Varco Model 6500 Power Sub.

8. Totco P i t Leve l and Flowline indicator .

9. Two Maxim TCP - 7.5 water d i s t i l l a t i o n units -15,000 gallons per'day t o t a l .

Page 4

c

ORILLING oilIT - PENROD 88

10. Two 400 amps, welding machines and oxygen-acetylene equipment.

11. Halliburton heavy duty electric powered wireline unit with 14^00.' of .092" line.

12. OMSCO 6-5/8" 15,000 psi test upper Kelly vaive.

13. TIW 10,000 psi test lower Kelly vale.

14. Gray inside B.O..P.

15. Drilco E-3 torque hydraulic cathead.

16. Fork l i f t truck for sack mud storage room.

17. Totco straight hole instrument 0 degrees - 8".

18. Overrhota and Taper Taps for contractor furnished * • d r i l l string.

19. One 15,000 psi test d r i l l pipe, safety valve.

20. Totco type "£• WLA-75 weight indicator, OCT 20-25 tong torque gauge, MGS0 Pump pressure gauge, •379-35 Rotary RPM indicator, and 379-31 pump stroke indicators.

21. Baroid 821 Mud test kit.

22 i Air tuggers in various si2es for use on rig floor aad cellar deck area.

.23. One central a i r systea with two 490 CFM air ccmpressors, one cold start compressor and one water cooled after cooler.

24. Diesel engine driven 250 KW emergency AC generator.

25. Baylor Filteron sewerage treatment plant.

26. Drilco degasser.

27. Spinner Hawk Spinning Wrench.

28. 2 - 44 man Watercraft - Shats covered l i f e boats.

f o

Page 5

HOUSTON PORT ° ARTHUR

TEXAS GALVESTON

CORFJS CHRISTI

MATAGORDA

<§V- I S L A N D <£>^ A R E A

APPROX. 42 UIUZS A-10 GULF OF MEXICO

TEXACO PRODUCING INC. N B W O R L E A N S , L A . ©

D R A W I N Q N O X T O S C A L I

kVSrm ISLAND BLK. A-10 OCS-G-7/75

APPROX. 57 MIIES SOUTHEAST OF CORPUS CHRISTI. TEXAS

ceai/siutAceanpOE CREKJ 6-23-87

Y - 666J89.75

3I0CT

Co

WELL 'C SURF. & PBHL 0CS-G-7I75 MUSTANG ISLAND BLOCK A-10

cv

5

i 65017

MUSTANG ISLAND BLK. A-10 OCS-G-7176

TEXACO PRODUCING INC. LS (5760 ACRES)

W5EU 'D* SWF. & PBHL 0CS-G-7I75 MUSTANG ISLAND BLOCK MO

WELL 'A' SURF. & PBHL 0CS-G-7I75 MUSTANG ISLAND BLOCK A-10

WEU 'L7 SURF. & PBHl 0CS-G-7I75 MUSTANG ISLAND BLOCK A-10

500CT

Y - 650349.75

NOTE* AIL COORDINATES ARE BASED ON TEXAS LAMBERT PLANE COORDINATE SYSTEIi. (SOUTH ZONE NAD 27).

P L A N O R E X P L O R A T I O N PUBUC IHFQPMAJIOH PLAI

TEXACO PRODUCINQ INC. N E W O R L E A N S , L . A .

MUST AMS /SLAV'S BLK. A-H) OCS-^7(7S

APPROX. 57 UILES SOUTHEAST OF CORPUS CHRIST/. TEXAS

SCALE

>000* 0* IOOD-

l2aU&]j/lAJ0A2DP0E iREHJ

20DD-

B-Z7-B7

DRILLING MUD COMPONENTS

Common Chemical 01 Chemical Trfrde Na^

j

Aluminum Stearate

" AKTAFLO-S" j

B a r i t e

Calcium Carbonate

Calcium Chlor ide

Calcium Oxide

Calcium Su l fa te

Carboxymethyl C e l l u l o s e

Caus t ic Potash

Caus t ic Soda

Chrome L i g n i t e

Chrome Lignosu l fona te

D r i l l i n g Detergent

"E-Pal"

Ferrochrome L ignosu l fona te

Gel

Gypsum

L i g n i t e

L i g n o s u l fonate

"Mud Sweep"

"MOR-REX"

"Sha le -Tro l "

Sapp

Soda Ash

Sodium Bicarbonate

Sodium Carboxymethyl Cel lu lose

Sodium Chloride

Sodium Chromate

Starch

"TX-9010"

"TORQ-Trim"

Description of Material

Aluminum Stearate

Nonionic Surfactant

Barium Sulfate (BaSO.) 4

Aragonite (CaCO )

Hydrophilite (CaCL2)

Lime (Quick)

Anhydrite (CaSO )

Carboxymethyl Cellulose

Potassium Hydrate

Sodium Hydroxi le (NaOH)

Chrome L i g n i t

Chrome Lignosulfonate

Soap

Non-toxic, biodegradable defoamer

Derived from woo*' pulp

Sodium montmorillonite, bentonite,

attapulgite

CaS04.2H20

Lignite

Lignosulfonate

Cement Pre-flush

Hydrolyzed Cereal Solid

Organo-aluminum complex

Sodium Acid Pyrophosphate

Sodium Carbonate

NaHCO3

Sodium Carboxymethyl Cellulose

NaCL

NaCrn4.10H2O

Corn Starch

Biodegradable d r i l l i n g lubricant

Biodegradable d r i l l i n g lubricant

DFC:taw POE/2

•I j r

J Common Chemical or Chemical Trade Name

"Black Magic"

"Black Magic Supermix"

Diesel

" J e l f l a k e "

MICA

"P ipe -Lax"

" W a l l - N u t "

Wood F i b e r s

MUD ADDITIVES

Description of Ma t e r i a l

O i l base mud concentrate

Sacked concentrated o i l base mud

Used t c mix c e r t a i n l o s s -c i r c u l a t i o n p i l l s

P l a s t i c f o i l , shredded cellophane

L o s s - c i r c u l a t i o n m a t e r i a l

Surfactant mixed w i t h d i e s e l

Ground w a l l n u t s h e l l s

L o s s - c i r c u l a t i o n m a t e r i a l


PROJECTED AIR EMISSIONS REPORT

MUSTANG ISLAND BLOCK A-10

FEDERAL LEASE OCS-G 7175

LOCATIONS "A", "B", "C" AND "D"

EMISSIONS IN POUNDS PER DAY

TEMPORARY SOURCES 2

D r i l l i n g Equipment.

N O x 257

CO

56

VOC

21

TSl

18

SO 2

17

Other Sources 19 15 11 _2 _2

TOTAL 276 71 32 20 19

EMISSIONS IN TONS PER YEAR

TEMPORARY SOURCES1

2 D r i l l i n g Equipment

N0 x

47.0

CO

10.2

VOC

3.8

TSP

3.8

SO?

3.1

Other Sources 3 3.5 2.7 2.0 2.0 0.4

TOTAL 50.5 12.9 5.8 5.8 3.5

Emission Exemptions f o r NO , CO, VOC, TSP and S0 2 are calculated

using the following formulas with a distance from shore of 37

miles.

E =

CO Exemption (E) i n Tons Per Year.

3400 x (distance f rom shore) 2 / 3 *= 3400 (37) 2 / 3 « 37,753

NO , VOC, TSP, SO„ Exemption (E) i n Tons Per Year.

33.3 x distance f rom shore = 33.3 (37) • ^ 3 2

(1) A i r emissions f rom temporary a c t i v i t i e s t h a t occur i n one l o c a t i o n f o r l e ss than three years are exempt f rom f u r t h e r a i r q u a l i t y r ev iew. Temporary a c t i v i t i e s f o r t h i s proposal w i l l l a s t approximately 432 days, t h e r e f o r e , being w i t h i n the l i m i t s o f the d e f i n i t i o n o f temporary a c t i v i t i e s .

(2) Based on 60 h p h r / f t . from study, "Atmospheric Emissions From Offshore O i l and Gas Development and Produc t ion , " EPA 450/3-77-026, June, 1977.

(3) Based on emission f a c t o r s f rom "Compilat ion o f A i r P o l l u t a n t Emission Fac to r s , " T h i r d E d i t i o n EPA Report AP-42, August,

1977 (Tables >3.2.1-3, 3.2.3-4, and 9.1-2). Included are helicopter landing and take o f f , two trips/week; supply and/or crew boats, at dockside, 12 hrs./day, two days/week? fuel storage land transfer; loading and unloading operations; and incineration of waste paper (average of 800 lb/mo) for duration of project.


Documents

taUJiJB^ - BSEE Data Center · Aita. TMs plsn includes the sctivities proposed for Wells A through 0. In accordance with 30 CPR 250.34. revised Oecerfcer 13. 1979. snd our lette dated