t I
In Reply Refer To: RP-2-1 Office of Program Sarvfsat
Sonat Exploration Cnwpany SEP 2 0 1985 Attention: Mr. D. I. Richards ro-t Office Box 1513 Information Services .too s ton, Texas 77251 Section
Gen t leaven- toftmnct: 1s awdt to your Initial Plan of Exploration and Environmental Report received Septan**? 4, 19S5. for lease 0CS-(5 7722, Block 251, South Hart* it land Area. Tim pits includes the activities proposed for Wells A-A, H-A, C-A.
In accordance wi h 30 CFR 250.34, rev. Oocenter 13, 1979, and our letter dated January 29, 1979, this plan ha* b**n d»ter«1ntd to be coaw/iete aa of Septenber 18, IMS, and la now being considered for approval.
Your plan control number 1s N-2284 and should be reference* 1n your connwnfea- tlon and correspondence concerning thit plan*
Sincerely your*.
0. If, Sol anas Rogtonal Seioervlaor Rules ami Production bec: , Lease OCS-6 7722 (0PS-3- 2) (FILE ROOM) (0P«,-3-4 w/Publ1c Info. Copy of the plan and ER (PUBLIC RECORDS R00N)
MJTolbert:gcw:9/16/85 Disk 38 Sonat Exploration Company Post Office Box 1513 Houston TX 77261 1513 713 940 4000
MUM EXPLORATION
August 30, 1985 Re: Plan of Exploration (POE) 0CS-G-7722 South Marsh Island Block 251
U. S. department of the Interior Minerals Management Service MINfRAlS MAW'FT tr-lCI Gulf Of Mexico OCS Region P. 0. Bo/ 7944 Metairie, Louisiana 70010-7944 SLP 0* 1S85
Attention: Deputy Minerals Manager for Offshore Operations Support (OS)
Gentlemen:
Enclosed are nine (9) copies of Sonets' Exploration's Initial Plan of Exploration (POL) for South Marsh Island Block 251 with only five (5) copies containing confidential information. A courtesy copy has been sent to the district MMS office in Lafayette. This Initial POE 1s filed 1n reference to wells A-A, B-A and C-A.
Also enclosed with ;he copy going to the district office is our Archeological and Hazard Study and the original shot data of the two (2) lines nearest the proposed well sites. We understand that once the district office has rt viewed the report and shot data, they will be returned to us for our files.
If you have any questions concerning this Initial POE or if you require any additional Information, please call me at 713/940-4014.
Sincerely,
D. E. Richards Supervisor of Drilling Engineering
JAW Enclosures cc: US Department of the Interior Minerals Management Service P. 0. Box 3288 Lafayette, LA 70502-3088 SONAT EXPLORATION COMPANY Mivrwijt mnusmm <*>> South Marsh Island BLOCK 251 (OCS G 7722) OFFSHORE Louisiana SEP 04 1985 PUBLIC INFORMATION COPY
In compliance with 30 CFR 250.34, the following information is submitted for the planned exploration activities:
1. Sonat plans to drill three exploratory wells in South Marsh Island Block 251. These wells require approximately 30 days to drill and evaluate A timetable is enclosed (Attachment 1). The surface locations of these wells, with respect to Block 251, are:
Well Surface Location
A-A 1000' FNL and 1000' FEL of Block 251 (see Attachment 7a) B-A 1700' FNL and 1300' FEL of Block 2^1 (see Attachment 7c) C-A 1500' FNL and 2500' FEL of Block 251 (see Attachment 7e)
2. Environmental safequards are discussed in the attached Environmental Report.
3. The three exploration wells will be drilled using a typical jack-up rig similar to the "Offshore Pegasus" drilling unit. A description of the rig and of features pertainlnq to safety and to pollution prevention and control are enclosed (Attachment 2a-2b). The drilling rig is the facility, under this plan, which is capable of producing air pollution. The main sources of air pollution on the rig will be the following engines: Four (4) Superior PTD-8 which will drive the rotary and drawworks; two (2) CAT D-398's and 1 CAT D-333 are used to drive the generators. During cementing, one (1) CAT D-311 engine will be used.
Based on EPA emission factors, all of the facilities proposed in this POE are expected to produce the following total quantities of pollutants in one year's time:
Total Emissions for All Calculated Exemptions Pollutant Facilities (tons/yr) E (tons/yr)
Carbon Monoxide 24.1 21,789 Nitrogen Oxides 111.4 532.8 Sulfur Oxides 7.4 532.8 Particulates 7.9 532.8 Hydrocarbons 8.9 532.8 Aldehydes 1.7 532.8
SMI251 POE PI *
w The total emissions for this proposed facility are clearly exempted from further air quality review under 30 CFR 250.57-l(d) for one year's operation. Projected emissions and the basis for all calculations are attached (Attachments 3a and 3b).
4. A vicinity map, which locates South Marsh Island Block 251, with respect to the Louisiana coast is enclosed (Attachment 4).
5. Onshore support facilities for drilling operations in Block 251 will be located in intracoastal City,LA. Sonat has a 24 hour communication base and loading dock facility established there. No additional facilities or personnel will be required as a result of the proposed activities.
6. Water depth at South Marsh Island Block 251 ranges from 20' to 24'. The Offshore Pegasus is capable of working in a minimum of 19' to a maximum of 125' during non-hurricane season. The drilling depth capacity of the rig is 16,000*. The rig is therefore capable of drilling the proposed wlls, while providing maximum personnel and equipment safety. Planned well control operation to surface casing depth Incorporate a diverter system and annular (BAG) type blowout preventers and a drilling spool to be installed on drive pipe while drilling the hole for conductor casing. The same diverter spool and blowout preventers will be installed on the conductor casing or drive pipe (whichever is applicable) while drilling the hole for the surface casing. For drilling below the surface casing, blowout prevention equipment will include: four (4) remote-controlled, hydraulically operated blowout preventers, including, two (2) equipped with pipe rams, one (1) with blind rams, and one (1) annular (BAG) type; a drilling spool; a choke line and manifold; a kill line and a fill-up line.
7. A Cultural Resources Report, with an Archeological Survey, was submitted on August 20, 1985. The proposed activities in the Initial POE will not affect the cultural resources of this lease.
8. All wells will be drilled in accordance with the relevant OCS orders. All reasonable precautions will be taken to avoid any oil or waste spills and the Sonat Oil Spill Contingency Plan (approved 1/21/85) shall be followed in the event of such a spill. This plan 1s on file in the New Orleans office of the Minerals Management Service and is available for public inspection. Attached are excerpts from the document showing the equipment to operate it, and information on response procedures within Sonat (See Attachment 6a-1). Sonat is a member of the Clean Gulf Association.
SMI251 POE PI 11. Also enclosed 1s an Environmental Report and Sonat's Coastal Zone Management Consistency Certification for the activities described 1n this Initial POE. 12. A list of mud components, to be used during the proposed activities, is attached (Attachment 11).
SMI251 POE PI ATTACHMENTS
1. Timetable
2. Rig Description
3. Emissions Calculations
4. Vicinity Map
6. Excerpts from Sonet's 011 Spill Contingency Plan
7. Surface Location Plats
10. Coastal Zone Consistency Certification
11. Mud Components List
SMI251 POE PI ATTACHMENT 1
SONAT EXPLORATION COMPANY
South Marsh Island Mock 251 (OCS 6 7722)
OFFSHORE, .ouslana
TIMETABLE
OPERATION DATES Drill and Evaluate Well #A-A November 1, 1985 Drill and Evaluate Well #B-A December 1, 1985 Drill and Evaluate Well #C-A December 31, 1985
SMI251 POE Offshore Pegasus SELF-ELEVATING JACK-UP PLATFORM
OPERATING WATER DEPTH II. DRILLING EQUIPMENT Maximum- 125 ft Drawworks National 110. drawworks. sandline. Minimum: 19 ft. driven by compound—Elmagco 6032 auiiliary brake Crown-O-Matic I. BARGE NULL EQUIPMENT Engines Four (41 Superior PTD-8 total 1940 HP Length Overall 188 feet Pump No. 1 National Nil 00 — 1100 HP. driven by Width Overall 106 feet compound Hull Depth 13 fett Pump No. 2 ... National N i l 00 — 1100 HP. driven by Jacks and Guide 20 ftet compound Slot . . 4C wide by 21'long derrick ... Lee C. Moore. 140' I 30' I 30' Single well, galvanized 1.100.000 lbs gross Legs Four (4) 200' long, cylindrical, 10' di nominal capacity ameter Substructure Lee C Moore. 30' i 40* i 15' high. Tank Footings 20' » 40' i 8' 1.000.000 lbs. capacity jacks Eight (8) 600 tone capacity each with 2.6' stroke and jacking speed of 40' Rotary National C 365 per hour raising Crown Block Shaffer. KN. 600 tons Mud Storage 1.200 barrels liquid Traveling Block . Shaffer. PN. 500 tons 2.500 satV storage Hook Byron Jackson 5500. 500 tons Mud or Cement 2.400 cc. ft. bulk Smvel National. N 1324 — 500 tons Fuel Storage 1.340 barrels Shale Shaker . Hutchison Manufacturing Co.. 4860 OU Water Storage 300 barrels potable Light Plants ... Two (2) Caterpillar 0 379TA 350 KW 1,138 barrels drilling Water Distillation Two (2) MECO. 300 gallons per hour Orill Pipe 12.000* 5". 19 50 lb.. Range 2. Grade capacity "€' Accumulator Koomey. 00 710O-3G. 3000 psi. 100 Cranes Two (2). unit "Marinec" Model 500 — gallons 30 tons. B O.P. 1 — 20" H>dril MSP. 2.000 lb. WP Winches Two (21. Roundtree. Mcdel F. double 1 _ 12" Hydril GK. 3.000 lb. WP drum with four 8,500 lb. anchors 1 — 10" Hydril GK. 5.000 lb. WP Quarters Centrally neated and air conditioned to 3 — 12" Cameron ORC. 3.000 lb. WP accommo< ate 72 persons 3 — 10" Cameron ORC. 5.000 lb. WP Helicopter Oeck . 42't 47'
ATTACHMENT 2a Offshore Pegasus SELF-ELEVATING JACK-UP PLATFORM
131
it» CD 1 i ! CI? i 1 r^l 3 i j «3 L7= 0 IC * 0( • LI J J
' f fa ItJ FN 2 I
mm. I ! » J '1 ;I FfMpi i_L iqsi L ii ID?o o. O r_ 1 3 0 c » I * fa 8 .is--. III II • i. 711
The Offshore Company P.O. BOX 2765 • HOUSTON. TEXAS 77001 713/622-5670 • Cable OFFORILL
ATTACHMENT 2b i-71-WP ATTACHMENT 3a FACILITY: Offshore Pegasus
OPERATING EMISSIONS FREQUENCY DURATION TIME EMISSION SOURCE (Operations/yr) >ys/Op.) (Days/yr) POLLUTANT FACTOR(g/hphr) Hp. g/hr lbs/day tons/yr
4 Superior 3 30 90 Carbon Monoxide 3.030 3030 9,181 485.9 21.9 PTD-8 (total 1940 HP) Nitrogen Oxides 14.000 42,420 2244.9 lOl.O 2 CAT D-398 Sulfur Oxides 0.931 2,821 149.3 6.7 Particulates 1.000 3,030 160.3 7.2 Exhaust Hydrocarbons 1.120 3,394 179.6 8.1 1 CAT D-333 Aldehydes 0.210 636 33.7 1.5
1 CAT D-311 6 2 18 Carbon Monoxide 3.030 311 942 49.9 2.2 Cementing Unit Nitrogen Oxides 14.000 4,354 230.4 10.4 Sulfur Oxides 0.931 290 15.3 0.7 Particulates 1.000 311 16.5 0.7 Exhaust Hydrocarbons 1.120 348 18.4 0.8 Aldehydes 0.210 65 3.4 0.2
The maximum time the rig will be in operation on this location 1s 90 days
= Sample Calculations: Total C09 for Facility Sum of C0« sources c • 21.9 + 2.2 (Frequency, op/yr) (Duration, days/op.) • Operating time (days/yr.) * 24.1 tons/yr. (3 oper./yr.) (20 Days/oper.) * 90 Days/yr. (Emission Factor, g/hphr) (Horsepower, hp) = Emission (g./hr) (3.030 g/hphr) x (3030 hp) = 9181 g./hr. (9181 g/hr) x (24 hr./day) x (0.002205 lbs./g.) « 485.9 lbs./day ( 485.9 lbs/day) x (90 day/yr) x (1 ton/2000 lbs) « 21.9 tons/yr.
SMI251 POE ATTACHMENT 3b FACILITY: Offshore Pegasus TOTAL EMISSIONS
FACILITY POLLUTANT TOTAL EMISSION (tons/yr.) EXEMPTIONS Carbon Monoxide 24.1 21,789 Nitrogen Oxides 111.4 532.8 Sulfur Oxides 7.4 532.8 Particulates 7.9 532.8 Exhaust Hydrocarbons 8.9 532.8 Aldehydes. 1.7 532.8
Exemption Calcultions: E 3400 D i,,D * Distance from facility to nearest shoreline *16 miles 3400 (16) Z/J
21,789 tons/year (For C09) 33.3 D c 33.3 (16)
532.8 tons/yr. (For N02, S02, TSP, and VOC's)
SMI251 POE t VICINITY MAP
SOUTH MARSH ISLAND BLK. 251 Of MBXICO
ATTACHMENT 4 DIRECT RESPONSIBILITIES
FIELD
Supervisors - (1) Accurately and timely report the disaster to the proper company personnel and government agencies.
(2) Secure the disaster and/or the facility personnel in the safest manner.
Pumpers and (1) Diligently prepare to assist in securing the Roustabouts disaster or facility.
Catering Crew and (1) As directed ly the *nan in charge. any Service Personnel - (2) Prepare to evacuate t.u.e disaster area.
Amelia/Tntra- (1) Respond to calls for transportation of personnel . coastal City Base Operators (?) Relay messages from the pJ tform in case of (Dispatchers) - telephone failure.
(3) Arrange for any medical assistance.
(A) Alert air and sea transportation companies. C5) Arrange for transportation of spill recovery equipment and personnel if activated.
Area Office
Area Super intendent (1) Assure that personnel and all affected facilities are secured in the safest -nanner.
(2) Notify Base Oper r (Dis- .tcher) to provide for transportation and/or medical needs.
(3) Perform information gathering/transmitting duties at central location.
(*») Alert and/or dispatch personnel to the oil spill recovery location.
ATTACHMENT 6a DIRECT RESPONSIBILITIES
HOUSTON OFFICE
Oil Spill Response Coordinator (Production/Drilling Superintendent)
1) Analyze the situation to determine if further r action is necessary to secure disaster location.
2) Determine if rpill recovery is necessary and/or practicable under current conditions.
3) Determine if strategic personnel should be dispatched to their positions.
4) Determine if field personnel utilization according to plan is necessary.
5) Head spill recovery program.
Operating Assistant
1) Notify Haliburton if Clean Gulf Associates equipment is to be deployed.
2) Coordinate transportation of spill recovery equipment to spill recovery location.
3) Head the spill recovery team.
4) If no spill to assist at disaster location.
a. to determine if any threats to human safety are present at. disaster location.
b. to gather the input/output data for O.S.H.A.
Purchasing Agent 1) Assist in locating and dispatching of any boats, outside personnel, or materials needed at the spill recovery location.
Vice-President/Manager of Operations
1) Assure that the Notification Procedure has been followed.
2) Head the information gathering/transmitting efforts at the Houston Office.
ATTACHMENT 6b ALERT PROCEDURE
All spills of oil and liquid pollutants shall be recorded and reported according to the following procedure:
A. The Field Supervisor will be responsible for:
1. Recording all such spills on the Daily Log or the Company Daily Drilling Report and IADC Tour Report* showing the Spill Reporting Data listed on page 3 of this plan.
2. Reporting all such spills orally to the appropriate U.S. Geological Survey District Office (as listed on page 9) within the following time limits:
a) Within 12 hours, if spills are 1.0 cubic meter (6.3 barrels) or less.
b) Without deiay, if spills are more than 1.0 cubic meter (6.3 barrels).
3. Reporting all such spills orally to one of the following (in order of priority):
a) National Response Center (800) 424-8802 U. S. Coast Guard 400 Seventh Street, S. W. Washington, D. C. 20590
b) U. S. Coast Guard (504) 589-7171 Captain of the Port (WPl 4640 Uquhart New Orleans, LA. 70117 c) Environmental Protection Agency (214) 767-2666 1201 Elm Street Dallas, Texas 75270
4. Reporting all such spills orally to the Area Superintendent or to the Dri11ing Superintendent according to the Notification Procedure found at the beginning of this plan.
5. Notifying other companies of observed pollution resulting from their operations, as required by O.C.S. Order No. 7, Paragraph 2.3.2."
B. The Oil Spill Response Coordinator shall report immediately all such spills or leakages that are in any way rel?ted to or suspected to be related to pipeline causes to the U.S. Geological Survey, Pipeline Approval Section, at (504) 837-4720; Ext. 257, in accordance with Notice To Lessees and Operators No. 80-9, dated October 06, 1980.
C. All oral reports to the above agencies shall be confirmed in writing by the "DfTllinq or Production Superintendent, as required by O.C.S. Order No. 7, Paragraph 2.3.
ATTACHMENT 6c EQUIPMENT DETAIL
The following is a listing of equipment available, location and personnel requirements. More detailed information on this and other equipment is available in the Clean Gulf Associates Operations Manual.
This equipment includes:
Deployment Time
Fast Response Systems Model I 2 hours (Intracoastal City, Venice, Cameron, Panama City, Bradenton, Rockport and Galveston)
Model II Fast Response Units are available for storage at remote locations or for rental like the FKU (Grand Isle, Venice, Intracoastal City, Cameron and Houma)
High Volume Open Sea Skimmer Systisn 6 hours (H0SS Barge) at Grand Isle
Shallow Water Skimmer Systems Immediate (Venice, Grand Isle and Hdux?--)
Auxiliary Shallow Water Skimmers and Booms Immediate (Grand Isle, Venice, Intracoastal City, Rockport and Galveston)
Helicopter Spray System 1 hour (HUSS Units) (Grand .sle, Venice, Intracoastal City, Rockport and Gtlveston)
Waterfowl Rehabilitation Unit and Bird Scarers 1 hour (Grand Isle, Venice and Intracoastal City) (Waterfowl Unit at Grand Isle)
Miscellaneous Material 1 hour
Radio Systems (New Orleans)
ATTACHMENT 6d RSQUIS-D FE-LSONNSL SWKARV ONE SHIFT
# Need Do Met Need Super- Train* nc Training vis cry u J J U 1 M J 1 1 ca ci o e i, c i £1 j— rC Ci CJI c 1 1 u C* J2 • ' a «: u tt cic5ic5" Ci f c zz~ i— CJ u
V V V l V S. Kicfc YoTuna Open Sea. Skirnrer A 0 A A i 3 0 X A (Launch 2nd A A A A A A, A A 0 V V V V 1 V V Retrieve) A A 0 0 A A | A A 14 0 V V V V V V j V V S fez* uining A A A A A A A A X 0 1 (?) C. S h a 11cw Watar Sk i nrae ns • V V X X A A 0 • V V V V A A A A 0
0. Auxiliary Shallow Water V V V A A 2 0 A Skimr.ers (per two units)
0. Auxiliary Shallow Water ;. Soon; V V V V V X A A A A s A V V V V X A A A X
V V V £. K«1 i ccptar Spray Sy stasis A A 2 c V : j A X 2 c
f. Bir^ Scarers V V A X 2 A V V v A A 2 A i
.1 T •v aw z 3: aw
o - Scrr.etirr.es it will be desirable tc have an extra son cn location. Where this syrr.be 1 appears provision can be mace tc handle tnis adciticnal man.
ATTACHMENT 6e GO NAT EXPlAORATlOH COMPANY NOTIFICATION PROCEDURE
OPERATION HASES PRODUCTION DRILLING AMELIA 50>i /631-2171 or SUPERVISOR SUPERVISOR INTRACOASTAL 3l0/093007'i
FRANKLIN OFFICE 310/020-5051! or GOVERNMENT AGENCIES j. L. MARKERSON 31O/O2O-3O65 or MINERALS MANAGEMENT SERVICE J. II. PEHDERGHASS 310/020-0190 or Metallic Diotrlct 5oT/037-'i720 or II. A. YOUNG 310/020-5036 Houma Diotrlct 5Ol|/060-liO33 or Lnfaycttc District 310/232-6037 or Lake Charles District 31fl/li, J-6W1O or HOUSTON DRILLING 713/9J'0-»iOOO Frceport Diotrict '»09/299-10»il DRILLING SUPERINTENDENT M. J. SIMON and U.S. COAST GUARD Home: 713/1' 37-2731' HOUSTON PRODUCTION 713/9,iO-liOOO National Response Center OOOA2'i-0002 ASST. PROD. SUPERINTENDENT n. A. LINDSTEDT Home: 713/027-07 3!< PRODUCTION SUPERINTENDENT AND OIL SPILL RESPONSE COORDINATOR J. M. SIMPSON SR. VICE PRESIDENT Home: 713/523-0230 n. ii. KEnn Home: 713/701-7520 ALTERNATE II. I. SMITH Home: 713/'»37-,«003
PRESIDENT CLEAN CULF ASSOCIATES 50'i/366-1735 F. D. LEIGH Home: 713A60-1076
ATTACHMr.NT 6f SONAT OIL TRANSMISSION INC. NOTIFICATION PROCEDURE
OPERATION BASES PRODUCTION DRILLING —• AMELIA50V/63T-217I or 1 SUPERVISOR SUPERVISOR INTRACOASTAL 310/093007 1 I FRANKLIN OFFICE 31o7020-5u5,l or GOVERNMENT AGENCIES J. L. MARKERSON 31Q/J2Q-3065 or MINERALS MANAGEMENT SERVICE J. II. PENDERCRASS 310/020-0190 or Mctniric District 5Oli/037Ji72O or R. A. YOUNG 310/020-5036 lloiuna District 5O»i/060-liO33 or Lnfnycttc District 310/232-6037 or Lnke Charles District 3l0/li70-6liho or HOUSTON DRILLING 713/9'iO-'iOOO Freeport District >I09/299-10M1 DRILLING SUPERINTENDENT M. J. SIMON ond U.S. COAST GUARD Home: 713/,«37-273,» HOUSTON PRODUCTION 713/9^0-^OQO National Response Center G00/>i2li-GG02 ASST. PROD. SUPERINTENDENT R. A. LINDSTEDT Home: 713/027-O? 3>»
PRODUCTION SUPERINTENDENT AND OIL SPILL RESPONSE COORDINATOR J. M. SIMPSON VICE PRESIDENT Home: 713/523-0230 R. II. KERR Home: 713/701-7520 ALTERNATE II. X, SMITH Home: .713/'«37-,i003
PRESIDENT CLEAN CULF ASSOCIATES 50U/366-1735 F. D. LEIGH Hom•e : 713/'»60-lO7 6
ATTACHMENT 6g SPILL RESULTING FROM DRILLING OPERATIONS
1. Personnel will be utilized as per Exhibit "F". .
2. Drilling operations will cease pending approval from Houston.
3. The Area Superintendent is to be available at a centralized location, to coordinate efforts to control and/or recover spill. He will not man platform or recovery equipment.
4. Houston is. to be kept aware of developments hourly, or as they occur. Telephone No.: (713) 940-4000
5. Base Operators (Disp tchers) are to inform boat crew to stand by for instructions. Air Logistics and PHI are to be notified also.
ATTACHMENT 6h SPILL RESULTING FROM DRILLING OPERATIONS
1. The Company Drilling Supervisor will lead operations to contain the spill brought on by drilling operations if safely possible 2. Personnel from locations near to the drilling operations will be utilized to operate the recovery equipment 3. A Production Supervisor selected by the Area Superintendent will supervise recovery operations 4. If necessary, additional manpower would be drawn from a contract labor force or personnel on their "off" days
ATTACHMENT 6i LOUISIANA
CAMERON VCRMIUON SMIAT EXPLORATION SOUTH MARSH ISLAND BLK.251 OFFSHORE LOUISIANA PROPOSED SURFACE LOCATION WELL A-A
SOUTH MARSH ISLAND BLK. 261 VICINITY MAP
ATTACHMENT 7a ,6322 X = 1 ,794 ,962 .662 ' Xsl, 809.720.712 V* Y-201.876.837' Y = 201.875.837'"
LOUISIANA
S4/MAT EXPLORATION SOUTH MARSH ISLAND BLK. 251 OFFSHORE LOUISIANA PROPOSED SURFACE LOCATION WELL B-A
SOUTH MARSH ISLAND BLK. 261 VICINITY MAP
6320 ATTACHMENT 7c X = 1 .79 1,962.662* X= 1 .809.720.7 12' Y = 2 16.633.887' Y-2 16.633.387' ""**
o 25! o n C-A 0 2500
X = 1 .794.962.66 2 14.758.05 1 .809.720.7 12^. Y=20 1.875.837" Yr20 1 .875.837'
SlyWAT EXPIRATION SOUTH MARSH ISLAND BLK. 251 OFFSHORL LOUISIANA PROPOSED SURFACE LOCATION WE'.' ~-A
80UTH MARSH ISLAND BLK.251 VICINITY MAP
ATTACHMENT 7e ATTACHMENT 10 COASTAL ZONE MANAGEMENT CONSISTENCY CERTIFICATION
INITIAL PLAN OF EXPLORATION
SOUTH MARSH ISLAND BLOCK 251
OCS-G-7722
The proposed activities described in detail in this plan comply with Louisiana's approved Coastal Management Program and will be conducted in a manner consistent with such a program.
SONAT EXPLORATION COMPANY Lessee or Operator
.E. Richards*7 Supervisor of Drilling Engineering
Augur.t 30, 1985
SMI251 POE ATTACHMENT 11 TYPICAL MUD COMPOSITIONS
SEAWATER GEL MUD This type mud is typically used to drill from the base of the conductor casing to the surface casing point. Generally, the seawater gel system will be used from less than 1000 feet to a maximum of 4500 feet. The components used to make up and maintain the required characteristics of this mud system are:
Mud Components Lbs/bbl of Mud 1. Dri1 led Solids —38^615 2. Bentonitoc Clay 30-40 3. Caustic - Sodium Hydroxide 0.5 - 1.5 4. Mica Flakes 0.5 - 1.5 (Lost Circulation Material) 5. Cellulose Polymer 0.0 - 0.25 6. Seawater As required - approx. 10#/ bbl salt from the seawater
LIGHTLY TREATED LIGNOSULFONATE SEAWATER/FRESHWATER (6,000-8,000 ppm Cl) MUD
As the hole is deepened b^low surface casing it becomes necessary to start adding additional materials to maintain the desirea mud characteristics. Slowly fresh water is substituted for sea water as the depth and temperature increase. A typical 10.0-10.5 pound per gallon lightly treated lignosulfonate system used to about 10,000 feet would include:
Mud Components Lbs/bbl of Mud 1. Drilled Solids 2. Bentonitic Clay —^nr20-30 — 3. Barium Sulfate - Weight Material 45-60 4. Caustic Sodium Hydroxide 1.0 - 2.0 5. Lignosulfonate 4-6 6. Lignite 0.0 - 3.0 7. Cellulose Polymer 0.0 - .25 8. Seawater/Freshwater As required - approx. 5#/bbl salt from 50/50 seawater- freshwater.
LIGNOSULFONATE FRESHWATER (3,000-4,000 ppm Cl) MUD
The deep portion of a typical well telow approximately 10,000 ft would require a freshwater lignosulfonate mud system in order to maintain the mud properties as desired for proper hole maintenance. A typical 10.0 - 11.0 ppg lignosulfonate treated mud system would include:
Mud Components Lbs/bbl of Mud 1. Drilled Solids 65-flO 2. Bentonitic 20-30 3. Barium Sulfate - Weight Materia! 55-150 4. Caustic Sodium Hydroxide 1-2 5. Lignosulfonate 4-8 6. Lignite 3-8 7. Defoamer/Detergents 0.5 8. Freshwater As required
SMI251 POE SONAT EXPLORATION COMPANY
ENVIRONMENTAL REPORT INITIAL EXPLORATION PHASE SOUTH MARSH ISLAND AREA BLOCK 251 OFFSHORE LOUISIANA OCS G 7722 I. TITLE PAGE A. Project Name: South Marsh Island Block 251 B. Area Name:
South Marsh Island C. Block Number: 251
D. Operator: Sonat Exploration Company E. Rig: Offshore Pegasus F. Platform/Unit Name: NA G. Date of Preparation of Environmental Report August 30, 1985 H. Lessee Representative:
Mr. D. E. Richards Sonat Exploration Company P.O. Box 1513 Houston, TX 77251-1513 (713) 940-4014 (office)
I. Previous Related Envircment.il Reports: NA
SMI251 ERF t
II. DESCRIPTION OF PROPOSED ACTION
A. Operator:
Sonat Exploration Company
6. Lease Number and Location:
OCS G 7722; South Marsh Island Block 251
C. Objective The objective of this proposed activity is to drill and evaluate wells A-A, B-A and C-A in Sc ith Marsh Island Block 251. D. Rig
These wells will be drilled by a typical jack-up rig similar to the M0ffshore Pegasus". See attachment B for rig details.
E. Time Frame
The proposed drilling activities will commence as follows: well #A-A on November 1, 1985, well #B-A on December 1, 1985 and well #C-A on December 31, 1985. No new onshore activities are associated with the proposed project.
F. Travel Modes, Routes, and Frequency
During drilling operations - two helicopter trips per week, five workboat trips per week, and two crewboat trips per week.
Unless otherwise noted, all routes to or from the South Marsh Island Block 251 area will initiate or terminate in intracoastal City.LA.See Attachment C.
G. Personnel Required
Onshore the lessee will utilize 3 individuals to coordinate offshore activities. These dispatchers will be employees oT Sonat Exploration Company.
Offshore personnel will include a Sonat Exploration Company representative and the following personnel:
During Drilling Operations
Position Number Required
Tool pusher 1 Barge engineer 1
SMI251 ERF Position Number Required Driller 2 Derrickman 2 Floorman 6 Motorman 2 Electrician 1 Catering Crew 5 - Crane Operator 2 Welder 1 Roustabout 8
Ir. addition, four individuals are required to operate two supply boats. One helicopter pilot is also needed. Total personnel required for the proposed activity will be about 40 people the majority of the time.
H. Equipment and Onshore Support System
1. Equipment
The structure to be utilized is a rig similar to the "Offshore Pegasus". At present, we do not have a rig contractor. The drilling equipment to be used will be similar to the one described in Attachment B.
2. Onshore Support Facilities
Sonat Exploration maintains a permanent base for dispatchers in Intracoastal City, LA. This facility is located at Rt. 3, Box 1074, Abbeville, LA 70510. The telephone number is: 318/ 893-8874.
No new jobs will result onshore from this project.
I. Nf?w Technology
No new technology will be involved in the implementation of J'e proposed activities or used in the onshore support facilities.
J. Oi1 Spill Contingency Plan
Sonat Exploration Company's Oil Spill Contingency Plan was approved January 21, 1985. This plan is on file in the New Orleans Office of the U.S. Department of the Interior, Minerals Management Service. The plan outlines the procedures which will be followed in the case of oil or waste material spills.
1. As previously noted, the best available and safest technologies will be utilized throughout the project. Utilization of these technologies will, to the maximum extent possible, insure against pollution. Should a spill occur in spite of maximum safety precautions, a specified sequence of events is provided for in the Oil Spill Contingency Plan.
SMI251 ERF 2. Personnel
The Sonat Drilling Supervisor will lead operations to immediately contain a spill resulting from some aspect of drilling or completion operations. Personnel from locations near the drilling operations will be utilized to operate recovery equipment. A Production Supervisor, selected by the Offshore Area Superintendent, will supervise recovery operations. If necessary, additional manpower can be drawn from a contract labor force or personnel on their off-days. Additional information on specific personnel involveJ 1n implementation of the contingency plan can be found in Sonat's Oil Spill Contingency Plan.
3. Equipment and Deployment Time
The following is a detailed listing of equipment available, Its location and deployment time.
Halliburton Services super ors will supply more detailed operating and maintenance i ructions when use of the equipment is required.
This equipment includes:
Deployment Time
a. ) Fast Response Systems 2 hours (Intracoastal City & Venice, Panama City and Bradenton, Galveston, Rockport)
b. ) High Volume Open Sea Skimmer System 6 hours (HOSS barge at Grand Isle)
c. ) Shallow Wat°r Skimmer System Immediate (Grand Isle, Venice, Intracoastal City) (Galveston, Rockport)
d. ) Auxiliary Shallow Water Skimmer and Booms Immediate (Grand Isle, Venice, Intracoastal City, Galveston, Rockport)
e. ) Helicopter Spray System 1 i.our (HOSS units in Grande Isle, Venice, Galveston, and Rockport)
f. ) Water Fowl Rehabilitation Unit and Bird 1 hour Scarers (Grand 111: 'nd Venice)
g. ) Portable Foam Generation Equipment 1 hour (Grand Isle, Venice, Intracoastal City)
h. ) Miscellaneous Material 1 hour
SMI251 ERF 4. Regional Contingency Plan
Sonat Exploration Company is a member of the Clean Gulf Association, a regional oil spill containment program.
K. Wastes and Pollutants
Solid waste discharges during exploration operations will be primarily from drilling operations, specifically drilling mud and cuttings.
Drilling muds are used to control pressures, cool and lubricate the drill bit, and remove cuttings. In addition, they prevent fluid flow either into or from the sub-surface formations and insure maximum geologic and engineering information from the well. During the drilling operation the mud is circulated down the drill pipe, out to the surface through the annulus between the drilled hole and the drill pipe. Upon reaching the surface, the fluid is passed over the shale shaker where drill cuttings are screened from the mud, and the mud is returned to the surface storage for iecirculation. In the drilling of the hole, the cuttings are discharged overboard. Some mud remains on the cutting surfaces and is lost throughout the drilling operation.
Except in unusual situations, drilling muds consist of a mixture of water, clays (either commercial or derived from the formation) to give suspension and filtration control and barite as needed to increase the fluid density and control formation pressures. Modified lignosulfonate is added in low concentrations to control the flow and filtration properties. Very low concentrations of other organic and inorganic chemicals may also be added. In unusual situations, oil may be emulsified in the water base mud, or an oil base mud (where oil is the liquid phase) may be u?ed. Any muds containing oil will not be dumped overboard. The typical compositions of gelled seawater and lignosulfonate treated muds are presented in Attachment F.
During drilling, drilling mud and cutiings are discharged from the shale shaker. This discharge point is usually between 10 and 40 feet below the water surface. An accurate estimate of mud discharges is difficult due to the great variability in mud demands for individual hole. According to Otteman (1976) the maximum discharge will not exceed 200 barrels a day while drilling to 5>000 feet. Otteman estimated a maximum discharge of 4,000 barrels of mud in drilling from 10,000 feet to 18,000 feet. For tho wells to be drilled in the proposer* project, the total estimated "tiu discharge is 11,462 cuft, or about 928 tons.
Sources of sar.itary waste produced will be human body wastes, showers, diswashers, etc. A lELI-FLOW waste disposal unit is on the rig. This will be used to decompose the wastes by bacteria action and contains an enzyme feeder to speed the process. After treatment, the effluent will have no more than 50 milligrams per liter BOP,- and the Suspended Solids content will not exceed 100 milligrams per liter
SMI251 ERF above the suspended solids content uf the ambient water used for flushing purposes. This system is capable of handling 2500 gallons per day or 100 persons, based on 25 gal/day per person. All of the above wastes disposal will be done in accordance with OCS Order No. 7, "Pollution and Waste Disposal". Other than emission associated with boats and helicopters, offshore emissions are related to direct and auxilary power sources on the drilling rig. Electrical power is provided by two CAT D-398 oilfield diesel engines and one CAT D-333, which are used to drive the generators. Also providing power for the rig are four Superior PTD-8 diesel engines. Assuming full power is developed continuously, and using a conservative approach for estimating, the emissions could be approximately 5.5, 25.6, 1.7, 1.8, 2.0, and 0.4 poinds per hour for carbon monoxides, nitrogen oxides, sulphur oxides, particulates, hydrocarbons, and aldehydes, respectively. Electrical power is available at the onshore support facility; air emissions will primarily result from the operation of internal combustion engines in automobiles, trucks, cranes and other loading equipment, boats and helicopter. Most emissions pertaining to the proposed exploratory plan will be related to loading and unloading operations. Total emission for each pollutant - carbon monoxide, hyc ^carbons, sulfur oxides, nitrogen oxides, and particulates - will be considerably less than EPA emissions standards. These small amounts of emissions will be spread over several weeks. Transportation-related emissions will be associated with boat and helicopter utilization. Emission factors (EPA, 1977a) for Inboard-powered boats are dependent upon a number of variables and firm emission estimates are difficult to establish. Approximate values of 2, 7, 3 and 18 pounds per hour have been calculated for emissions of sulfur oxides, carbon monoxide, hydrocarbons and nitrogen oxides, respectively, for each operating boat. Emissions attributable to each helicopter landing-takeoff cycle (EPA, 1977b) at either onshore or offshore locations are estimated to be 0.S 0.4, 11.0, 1.0, 1.2 pounds of particulates, sulfur oxides, carbon monoxides, hydrocarbons, and nitrogen oxides, respectively. These air emmisions for onshore, transportation and offshore operations associated with the proposed exploration activities are believed to be conservative; that is, actual total emissions should be much less than indicated. L. Project Location The general project area is shown in Attachment D. The more specific location cf South Marsh Island Block 251 and of Amelia, Louisiana are shown in AttarHent E. The center of Block 251 1s at Latitude 29°, 14', 26.24"N and Longitude 91°, 57', 11.00" W. K Certificate of Coastal Zone Consistency: A certificate of Coastal Zone Consistency is filed with the accompanying Initial POE. See Attachment 10 of that plan.
SMI251 ERT N. Compliance with OCS Orders and Other Regulations: All applicable Federal, State, and local requirements regarding air emission and water quality and discharge for the proposed activities, as well as any other permit conditions will be complied with. 0. Nearby Pending Actions: The applicant is not aware of the any nearby pending actions. P. Product Transportation and Quantity: N/A
SMI251 ERF III. DESCRIPTION OF AFFECTED ENVIRONMENT AND IMPACTS A. Commercial Fishing: The Gulf of Mexico fishery is dominated by shellfish production, particularly shrimp, crab, and oysters; this production is usually worth 3 tc 4 times more than the much greater volume of finfish produced. The shrimp fishery primarily includes brown* white, and pink shrimp taken almost exclusively with trawls, in depths ranging from 6 to 240 feet. Other commercial shrimp include sea bobs and royal reds. Block 251 is located in Grid Zone number 15 as designated by the National Marine Fisheries Service. (This is a designation for statistical cnpHation of fishery production on the continental shelf). During 1975, Zone 15 was the 3rd most productive shrimp catch zone among a total of 11 zones along the Gulf Coast. It was the 1st most productive zone for white shrimp along the Gulf Coast, (see Attachment A for details) The Gulf Coast fishery for finfish is dominated in volume, as well as in value, by menhaden; practically all of the Gulf Coast catch of other finfish is made within 12 miles of the Shoreline. Gunter (1967) pointed out that 97.5% of the total commercial fisheries catch of the Gulf States is made up of estuarine species, finfish or shellfish that have spent all or part of their lives in estuaries. The offshore area west of the Mississippi River has annually supported the largest menhaden fishing of the U.S., with particular concentration near the mouth, and west from the Ship Shoal area to Cameron. Red snapper ranks second to menhaden in finfish value on the Gulf Coast. A major oyster ground exists approximately 15 miles North of Block 251 along the Southern Shore of Marsh Island. (U.S. Department of the Interior, 1980). The turpidity associated with drilling activities may temporarily cause shrimp to avoid the drill rig area; drill cuttings are expected to form low mounds (approximately 3 feet high) which may temporarily obstruct trawling activities. Observations in the Gulf of Mexico and Santa Barbara Channel, however, show that several months after drilling is completed, the cuttings piles are less than 6 inches above the sea bottom (Sheen Technical Committee, 1976). The proposed activities should have no impact upon the above-mentioned oyster grounds, due to the distance involved. B. Shipping There are no fairways or anchorage areas in the vicinity of the project area. C. Small Craft Pleasure Boating, Sport Fishing, and Recreation: Ridgley (1975) estimated that approximately 350,000 or 12% of all private recreational boats in the Gulf States region were utilized in
SMI251 ERF saltwater recreation. A U.S. Coast Guard Study (U.S. Department of Transportation in 1977) estimated that 10% of the boating population operates 3 miles or more from shore in coastal water. Based on boat registrations for 1976, 100,000 recreational boats are utilizing offshore water in the Central and Western Gulf. The majority of these boaters are probably recreational fishermen. No fishing banks have been identified as occuring within Block 251 (U.S. Department of the Interior, 1980).
The coastal marshes of Louisiana are utilized for such recreational activities as boating, picknicking, beach swimming, camping, fishing, and waterfowl hunting. The State Planning Office (1976) has recommended that new or expanded sites for recreation be developed in the Louisiana coastal zone. In Vermilion Parish there is one ornamental garden, (Rip Van Winkle Gardens shared with the Iberia Parish) and one recreational beacn along the southern coast of the parish; this beach is the site of a proposed State Park (Cheniere-Au-Tigre). There is another recreational beach along the southern coast of Cameron Parish It is che site of another proposed State Park (Rutherford Beach). Cameron has another State Park (Sabine Pass Lighthouse), along the coast, near the Texas border. Saint Mary's Parish contains one recreational beach area and a proposed State Park (Cypremort Beach) in Westcote Blanche Bay. Terrieborne r Irish has several beach areas along the Caillou and Timbalier Bays, as well as a proposed State Park (Isle Dernieres). LaFourche and Jefferson parishes have recreational beaches scattered along their coasts. Grande Isle, a State Park, is situated on one of the Jefferson Parish beaches. Plaquemine Parish has a few beaches along its Northwest Coast, near Barataria Bay. There are additional coastal State Pa k in New Orleans Parish (Fort Pike, Fort McCombe) and Saint Tamma •' p.? -'sh (Fairview Riverside, Fontainbleau). The beaches and par s n crmilion Parish are approximately 26 miles Northwest of South :\-sh Island Block 251. (U.S. Department of the Interior DEIS A62 be', 1980).
The proposed activities should not affect or be affected by :mall craft pleasure boating or recreational activities. During the time the wells are being drilled, the drill rig is likely to promote snapoer and grouper sport fisheries by temporarily providing an artificial retf habitat. This represents a temporary, positive impact on sport fishing.
D. Cultural Resources:
An Archeological Survey was obtained on August 20, 1985 and was submitted to the proper agencies on August 20, 1985. The seafloor is smooth with no protrusions, craters, sediment fluidization, or venting subsurface gases. There are no known ship wrecks or other objects of historic value on the block. However, should any find of possible archeological significance be encountered, the proper government authorities will be notified and their outlined steps will be followed to preserve this find. Local seafloor slope averages 0.02 percent (0.01°) to the northwest.
E. Ecologically Sensitive Features:
SMI251 ERF In addition to the beaches, parks and gardens, discussed in Section 3C, ecologically sensitive areas in Louisiana include: Sabine National Wildlife Refuge (Cameron Parish), Lacassine National Wildlife Refuge (Cameron Parish), Sabine Wildlife Management Area (Calcasieu Parish), Rockefeller Wildlife Refuge (shared by Cameron and Vermilion Parishes), Louisiana State Wildlife Refuge (Vermilion Parish), Marsh Maud Wildlife Refuge (Iberia Parish), Shell Keys National Wildlife Refuge (off the Iberia Parish coastline), Attakapas Wildlife Management Area (St. Mary and St. Martin Parishes), Pointe Au Chien State Wildlife Management Area (Terrebonne and LaFourche Parishes), Wisner State Wildlife Management Area (La Fourche Parish), Salvador State Wildlife Management Area (St. Charles), Jean Lafitte National Historic Park Preserve (Jefferson Parish), Delta National Wildlife Refuge and Pass A Loutre Wildlife Management Areas (Plaquemines Parish), Biloxi Wildlife Management Area (St. Bernard Parish), Breton National Wildlife Refuge (off the coast of St. Bernard Parish in Chandeleur Sound), Manchac State Wildlife Manage ment Area (Tangipahoa Parish), the St. Tammany National Wildlife Refuge and Pearl River State Wildlife Management Area (in St. Tammany Parish). In addition, the Raney Wildlife Sanctuary in Vermilion Parish is a National Audubon Society Sanctuary. Many of these areas contain sensitive swamp or marshland terrain. Some are inhabited by endangered species. The Red wolf, for instance, inhabits Cameron, Calcasieu, and Vermilion Parishes. The Bald Eagle restr in Terrebonne, Lafourche, St. Charles, Jefferson, and Plaquemines Parishes. The Brown pelican can be found in LaFourche Parish. Marsh Island supports a large population of American alligators. (Endangered species are considered in detail in Section 31 in this report). All of these areas are important to waterfowl. Such areas are approximately 17 miles from South Marsh Island Block 251 in Iberia Parisn and approximately 37 miles from South Marsh Island Block 251 in Vermilion and Cameron Parishes. The coastal wetlands, which surround the bays ±17miles North of Block 251, are valuable to water fowl and other water-associated birds. For example, dabblers such as the Mallard, Gadwall, Wiageon or Baldpate, Teal, Shoveler, Pintail and mottled duck are abundant winter residents of the brackish marsh. In contrast, diving ducks such as the Redhead, Canvasback, Scaup, and Ring-necked duck are much more common offshore and 1n the Sabine marshes of the coastal region. Wooded swamps offer attractive winter habitat to the Mallard and a breeding habitat for species such as the Woodduck. The Snow goose is also a common winter resident of the area. The coastal marshes provide breeding, as well as over-wintering habitat, for gulls, terns, herons, egrets and other forms of aquatic or semi-aquatic birdlife. Colonial birds, wading birds, shorebirds, and numerous passerine specie^ are found here. The Common Snipe, for example, is one abundant winter resident which is also subjected to recreational hunting. Other common species are Tree-sparrow, Shorttailed sparrow. Among very common permanent residents are W11 let, Great-tailed grackle, Red-winged blackbird, Fish crow, Great blue heron, Black-crcwn night heroi., King rail, Calpper rail, Yellowthroat and Seaside sparrow.
SMI251 ERF No living or breeding habitats and no migration routes should be affected by the proposed project. No live-bottom reefs exist 1n the area of the proposed activities.
F. Existinq Pipelines or Cables: N/A
6. Other Mineral Uses: 15 2 Block 251 is in an area where thermal energy is<60 x 10 J/KM and methane energy in sand beds is<74 billion SF/sq. mile. No mineral uses, other than oil and gas, exist in South Marsh Island Block 251 (U.S. Department of the Interior, 1980). H. Ocean Dumping Activities: No ocean dumping activities occjr in the South Marsh Island Block 251 area. (U.S. Department of the Interior, 1980) I. Endangered or Threatened Species: I. Birds A few nests of the endangered bald eagle (Haliaetus leucocephalus leucocephalus) are found in Terrebonne, St. Mary, La Fourche, Jefferson and St. Charles parishes in Louisiana. An oil spill, reaching the coast, could contaminate the eagle's food supply (fish, waterfowl, and shorebirds). (U.S. Department of the Interior, 1980). Based on the Bureau of Land Management mapping of potential nesting (U.S. Department of the Interior, DEIS A62 & 62, 1980), no nest could occur within 29 miles of South Marsh Island Block 251. Because of the distance involved, and since the project will utilize existing onshore facilities, will comply with all applicable OCS Orders (thus minimizing the already small chance of a spill), and in the event of a spill will follow Sonat's approved Oil Spill Contingency Plan, impact on this species if any, should be minimal. (U.S. Dept. of the Interior, DEIS A62 & 62, 1980).
2. Mammals The Red Wolf (Canis rufus), an endanger.d species since 1970, now exists in a genetically pure form along the Gulf Coasts in Chambers and Jefferson Counties, Texas; and 1n Cameron and Vermilion Parishes, Louisiana. The proposed activities should not affect this species (U.S. Department of the Interior, DEIS A-62 & 62, 1980). Few marine mammals occur in the coastal waters of Louisiana. The o ly cetacean that is normally seen in Louisiana inshore waters is the Atlantic bottle-nosed This mammal is common within the Louisiana Coastal waters and is not endangered. (U.S. Dept. of the Interior, DEIS A62 & 62, 1980).
SMI251 ERF 3. Reptiles Five soecies of marine turtles occur in the Gulf of Mexico: Loggernead (Caretta caretta), Atlantic Ridley (Lepidochelys kempi), hawFibill (Eretmochelys imbricata), Leatherback (Dermoche1>s coriacea) and green (Chelonia mydas). All of these species are designated as endangered by the Convention on International Trade 1n Endangered Species of Wild Fauna and Flora. Tn addition, the Atlantic Ridley, Hawksbill, and leatherback are listed as endangered by the U.S. Fish and Wildlife Service under the Endangered Species Act of 1973, while the loggerhead and green turtle have been accorded threatened status. (U.S. Dept. of the Interior, DEIS A62 & 62, 1980).
Of these five species, only the Atlantic Ridley is at all likely to be seen in the project area, as a major feeding grounds for the turtle may be off Louisiana (U.S. Department of the Interior, 1980). Potential oil spills could adversely affect individual turtles at sea and, 1f washed ashore during the nesting season, could severly impact the nesting beaches of these turtles. By following OCS Orders and, in the event of a spill, Sonat's approved Oil Spill Contingency Plan, Sonat will make every effort to minimize the potential of, and any adverse affects from, an oil spill. (U.S. Dept. of the Interior, DEIS A62 & 62, 1980).
J. Socio-Economics:
The initial OCS Socio-Economic Data Base Report will be submitted within three months when the requirements and guidelines for such a report are established.
IV. UNAVOIDABLE ADVERSE IMPACTS
Adverse environmental effects which could result from the proposed drilling activity are few and of short duration. The discharge of drilling muds and cuttings will result in a localized reduction in water quality and a temporary reduction in biological productivity. Commercial fishing will be negatively a fected to the extent that the drilling rig will interfere with trawl fishermen for the duration of the project.
V. The proposed activity will be carried out and completed with the guarantee of the following items:
A. The best available and safest technologies will be utilized throughout the project. This Includes meeting all applicable requirements fcr equipment types, general project layout, safety systems, and equipment and monitoring systems.
B. All operations will be covered by a MMS approved oil spill contingency plan.
SMI251 ERF C. All applicable Federal, State, and Local requirements regarding air emission and water qulalty and discharge for the proposed activities, as well as any other permit conditions, will be complied with.
SMI*51 ERF VI. REFERENCES Environmental Protection Agency, 1977b. Compilation of Air Pollutant Emission Factors, AP-42, Second Edition, Section 3,2,1.
Gunter, G., 1967. In: Estuaries. G.H. Lauff (ed.), Pub. #83 AAAS, Washington, D.C. pp 621-638.
Otteman, L.G., 1976. Response letter from Shell Oil Company's New Orleans Division Production Manager communicating on the DE IS for OCS Sale 44. Published in FEIS, Sale 44, BLM, Washington, D.C.
Sheen Technical Subcommittee, 1976. Environmental aspects of drilling muds and cuttings from oil and gas extraction operations in offshore and coastal waters. Offshore Operations Committee. 50 p.
Ridgley, Jr., 1975. Selected Information on recreational boats in the United States. Marine Fisheries Reviews, Paper 1122. 37(2): 16-18.
State Planning Office, 1977b. Recreational potential. Coastal Resources Program, Baton Rouge, Louisiana. 9p.
U.S. Department of Commerce, 1963. Climatic Atlas of the United States. Environmental Science Services Administration. Environmental Data Service. Washington, D.C. 80p.
U.S. Department of the Interior, BLM, 1977a. Draft Environmental Impact Statement. Proposed 1978 Outer Continental Shelf Oil and Gas Lease Sale. Offshore Western and Central Gulf of Mexico, OCS Sale 51, Vol. 1 & 2.
U.S. Department of the Interior, BLM, 1980. Draft Environmental Impact Statement and Final Environmental Statement. Proposed 1980 Outer Continental Shelf Oil and Gas Lease Sale. Gulf of Mexico OCS Sale A62 and C2, Vol. 1.
U.S. Department of the Interior, BLM, 1980. Final Environmental Impact Statement. Proposed 1981 Outer Continental Shelf Oil and Gas Lease Sale. Gulf Of Mexico OCS Sale A-66 ard 66.
U.S. Department of the Interior, BLM, 1981. Final Environmental Impact Statement. Proposed 1982 Outer Continental Shelf Oil and Gas Lease Sale. Gulf of Mexico OCS Sale 67 and 69.
U.S. Department of Transportation, Coast Guard, 1977. Boating Statistics: 1976. U.S. Govt. Printing Office, Washington, D.C. CG-357. 35p.
SMI251 ERF ATTACHMENTS
Shrimp Catch by NMFS GRID ZONE for 1975 Rig Description Transportation Route Plat Vicinity Plat Surface Location Plat Typical Mud Compositions ATTACHMENT A
SHRIMP CATCH BY NMFS1 GRID ZONE FOR 1975 (Includes Inland Waters) Weight (lbs.)2
No. Brown White Pink Other Total 11 3,999,504 804,273 3,073 24,982 4,831,332 12 79,553 54,403 -- 5,410 139,366 13 3,343,108 1,351,997 -- 554,538 5,249,643 14 1,818,594 878,035 1,026 314,666 3,012,321 SMI 251 15 1,342,067 4,801,342 1,929,487 8,072,896 16 971,374 2,582,528 — 92,385 3,646,287 17 1,700,148 2,824,342 550 799,436 5,324,476 18 4,026,618 2,138,499 — 22,718 6,187,835 19 6,712,688 1,545,304 — 36,858 8,294,850 20 7,769,969 388,996 555 — 8,159,520 21 6,215,611 79,913 — — 6,295,524
National Marine Fisheries Service
2Weight with heads off
Source: Gulf Coast Shrimp Data Summary, U.S. Department of Commerce, 1976. In: USDI, 1977a.
SMI251 ERF Offshore Pegasus SELF-ELEVATING JACK-UP PLATFORM
OPERATING WATER DEPTH II. DRILLING IQUIPMENT Maximum: 125 ft Orawwoiis National UO. drawworks. sandline. Minimum: 19 ft. driven by compound—Elmagco 6032 auxiliary brake Crown 0 Matic I. B»RGE HULL EQUIPMENT Four (4) Superior PTD-8 total 1940 HP length Overall 188 feet Engines Pump No. 1 HmmM N I100 - 1100 HP. driven by Width Over:!l .. 106 feet compound Hull Depth 13 feet Pump No. 2 National N-1100 — 1100 HP. driven by Jacks and Guide 20 feet compound Slot 40' wide by 21' long Oerrick Lee C. Moore. 140' x 30' i 30' single
ir well, galvanized 1.100.000 lbs gross Legs Four (4) 200' long. cy* d ATTACHMENT B Offshore Pegasus SELF-ELEVATING JACK-UP PLATFORM The Offshore Company P.O. BOX 2765 • HOUSTON. TEXAS 77001 713/622-5670 • Cablet: OFFORILL Attachment B TRAVEL ROUTE SOUTH MARSH ISLAND BLK. 251 BOAT ROUTE HELICOPTER ROUTE OF MBXICO ATTACHMENT C 6317 6316 VICINITY MAP SOUTH MARSH ISLAND BLK. 251 OF MEXICO , ATTACHMENT D LOUISIANA CAMERON VCRMIU0MV»V. j.' StMAT EXPLORATION SOUTH MARSH ISLAND BLK.251 OFFSHORE LOUISIANA PROPOSED SURFACE LOCATION WELL A-A SOUTH MARSH ISLAND BLK. 251 •000 1000 ?coo VICINITY MAP i»tl • i.. 6322 ATTACHMENT X r 1 .794.962.662 X = 1.809.720.7 12; ^ Y = 2 16.633.687' Y = 2 16.633.887' LOUISIANA StrNAT EXPLORATION SOUTH MARSH ISLAND BLK. 251 OFFSHORE LOUISIANA PROPOSED SURFACE LOCATION WELL B-A SOuTH MARSH iSLAND BLK. 251 VICINITY MAP i6320 ATTACHMEN T E X= 1 .809.720.7 1 2' Y = 216.633.887' ^ LOUISIANA CAMERON m^jf SfeNAT EXPLORATION SOUTH MARSH ISLAND BLK. 251 OFFSHORE LOUIS ANA PROPOSED SURFACE LOCATION WELL C-A SOUTH MARSH ISLAND BLK.261 • 000 0 '000 2 OOO VICINITY MAP •tn ••»» . MMtt*Cf «0 MM - — t—Na I ,,. 6319 ATTACHMENT E ATTACHMENT F TYPICAL MUD COMPOSITIONS SEAWATER GEL MUD This type mud is typically used to drill from the base of the conductor casing to the surface casing point. Generally, the seawattr gel system will be used from less than 1000 feet to a maximum of 4500 feet. The components used to make up and maintain the required characteristics of this mud system are: Mud Components Lbs/bbl of Mud 1. Drilled Solids 46-66 2. Bentonitoc Clay 30-40 3. Caustic - Sodium Hydroxide 0.5 - 1.5 4. Mica Flakes 0.5 - 1.5 (Lost Circulation Material) 5. Cellulose Polymer 0.0 - 0.25 6. Seawater As required - bbl salt from the seawater LIGHTLY TREATED LIGNOSULFONATE SEAWATER/FRESHWATER (6,000-8 000 ppm Cl) MUD As the hole 1s deepened below surface casing it becomes necessary to start adding additional materials to maintain the desired mud characteristics. Slowly fresh water 1s substituted for sea water as the depth and temperature Increase. A typical 10.0-10.5 pound per gallon lightly treated lignosulfonate system used to about 10,000 feet would Include: MJJ Components Lbs/bbl of Mud 1. Drilled Sr i Ids —IT^W 2. Bentonit1c Clay 20-30 3. Barium Sulfate - Weight Material 45-60 4. Caustic Sodium Hydroxide 1.0 - 2.0 5. Lignosulfonate 4-6 6. Lignite 0.0 - 3.0 7. Cellul'se Polymer 0.0 - .25 8. Seawa;er/Freshwater As required - tipprox. 5#/bbl salt from 50/50 seawater- freshwater. LIGNOSULFONATE FRESHWATER (3,000-4,000 ppm ci) MUD The deep portion of a typical well below approximately 10,000 ft would require a freshwater lignosulfonate mud system in order to maintain the mud properties as desired for proper hole malntenart •-. A typical 10.0 - 11.0 ppg lignosulfonate treated mud system wou J include: Mud Components Lbs/obi of Mud 1. Drilled Solids 6^10 2. BentonUlc 20-30 3. Barium Sulfate - Weight Material 55-150 4. Caustic Sodium Hydroxide 12 5. Lignosulfonate 4-8 6. Lignite 3-8 7. Defoamer/Detergents 0.5 8. Freshwater As required SMI251 ERF COASTAL ZONE MANAGEMENT CONSISTENCY CERTIFICATION Plan of Exploration South Marsh Island Area. Block 251 OCS-G-7722 The proposed activities described in detail in this Plan comply with Louisiana's approved Coastal Management Program and will be conducted In a manner consistent with such a Program. Arrangements have been made with the State-Times in Baton Rouge, Louisiana to publish a public notice of the proposed activities no later than Friday, September 20, 1985. Sonat Exploration Company Operator September 11, < 985