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Project: Offshore Pipeline Segment Number 8585 request to abandon in place thru Gulf Safety Fairway

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MC Offshore Petroleum, LLC SWG-2017-00832 PIPELINE DECOMMISSIONING APPLICATION

Segment #8585 GC 52 CCP to El 316 20" SSTI

(A) IDENTIFICATION OF THE APPLICANT

Lease Operator Name: MC Offshore Petroleum, LLC

Sheet 10of14

Address: 77 Sugar Creek Center Blvd., Ste 450 Sugar Land, TX 774778

Contact Person: Ashu Vashisht, President

Contact Number: 281-201-8000 x107

(B) REASON FOR THE OPERATION

As per 30 CFR 250.1751, applicant proposes to decommission the pipeline segment in place. The pipeline segment is no longer necessary due to the end of the economic life of the associated well(s) and platform.

(C) DESCRIPTION OF THE PIPELINE

Table 1 summarizes the pipeline segment parameters. The entire length of the pipeline segment is proposed to be decommissioned in place. Applicant hereby requests a waiver from the requirements of 30 CFR 250.1752 to remove the pipeline. Note: 20' will be removed from the GC 52 CPP and 20' from the El 316 20" SSTI. The remaining pipeline length will be 153,473 feet. Applicant also requests a waiver from the requirements of 30 CFR 250.1751 (b) to pig the pipeline.

T bl 1 a e p t th p· r P arameters o e 1pe me repose d f D or ecomm1ss1onmg Segment Origin Terminus Length Diameter Service

8585 GC 52 El316

153,513' 12" OIL CPP 20" SSTI

(D) DECOMMISSIONING PROCEDURES

Please see attached work procedure.

MC Offshore Petroleum, LLC SWG-2017-00832 PIPELINE DECOMMISSIONING PROCEDURE

Segment #8585 GC 52 CPP to El 316 20" SSTI

Sheet 11 of 14

The dive/ROV crew and equipment will mobilize to vessel at dock of convenience. The filtration crew and equipment will mobilize to a utility vessel of opportunity. Each vessel will complete a safety meeting and a HAZID analysis.

Once in the field, the diving/ROV supervisor and the filtration supervisor will meet or speak with the MC Offshore Petroleum representative and the platform operator to discuss flushing operations, filtration of the pipeline contents and abandonment of the pipeline in-place.

Segment #8585: 12" Pipeline from GC 52 CPP (620' wd) to El 316 20" SSTI (230' wd)

1. Flush the 12" Pipeline:

a. Once operational plans have been established, the dive/ROV vessel will proceed to the El 316 20" SSTI coordinates and position the vessel over the SSTI location.

b. The filtration crew will secure the utility vessel at GC 52 CPP.

c. The filtration crew at the GC 52 CPP platform will identify an appropriate location to tie in to the pipeline segment 8585.

d. The dive crew will locate the 12" pipeline segment 8585 located at an unknown depth below natural bottom utilizing side scan sonar and/or magnetometer.

e. Divers will locate ball valve in the SSTI and CLOSE fully while counting turns. Then the diver will then OPEN to~ OPEN.

f. Filtration crew will establish contact with the diving crew and ensure that all valves are ready to accept fluids.

g. Radio communications will be maintained between the dive crew and the filtration crew during the flushing operations.

h. The capacity of a single volume of the 12" pipeline is 21 ,064 barrels or 844,696 gallons. The filtration crew will push a pig to the SSTI with sea water to the ~ OPEN ball valve at the SSTI. Product will travel ahead of the pig into the 20" SSTI system.

i. Once the pig has been received at SSTI, the filtration crew will set up and prepare to receive and process fluids from the SSTI.



Sheet 12 of 14

j. Divers will uncover the remaining 20" SSTI. Divers will utilize a hydraulic jack hammer to separate and remove any 3/1 sand cement bags as necessary.

k. Divers will locate and identify each of the valves on the SSTI and the flange furthest from the SSTI as the separation point for final decommissioning.

I. Divers will determine if there is a bypass line present to tie into.

m. If a bypass line exists, the divers will ensure all bypass valves are in the closed position and locate the blind flange. Divers will open the bleeder valve and ensure there is no pressure on the pipeline flange.

n. Divers will remove the blind flange and connect the flushing flange with the flushing hose connected.

o. If there is not a bypass line present, divers will ensure all SSTI valves are in the closed position.

p. Divers will ensure there is no pressure on the pipeline at the GC 52 CPP platform and at the 20" SSTI.

q. Divers shall set the pollution dome over the flange furthest from the SSTI and disconnect the flanges.

r. Divers will install a flange on the 12" pipeline end with a flushing hose attached.

s. The dive/ROV vessel will flush by pumping sea water into the pipeline. The filtration crew will monitor returns and perform EPA bucket sheen test. They will continue pumping sea water until negative test results are obtained from sheen test.

t. Once complete, the filtration crew will close all valves and disconnect hoses.

u. The pipeline pressure will be bleed to zero psig.

v. The filtration vessel will move off work location to dock to have its contents properly treated and disposed of, in accordance with all federal and state regulations.



2. Remove the pipeline segment at the El 316 20" SSTI:

Sheet 13 of 14

a. The divers wilt cold cut the 12" pipeline segment 20 feet upstream of the flange and remove the 20' section of pipe to the surface.

b. The dives will install a 12" blind flange with a bleeder valve on the SSTI and tighten with a hydraulic impact.

c. The open pipeline end will be plugged (using a plumber's plug or similar devise) to prevent spillage.

d. The divers will hand jet the pipeline end for a minimum 3' of cover.

e. The divers will install Y2 of a pallet sandbags over the pipeline end and take reading on top of the sand bags.

f. The divers will install sandbags on the SSTI as necessary.

3. Remove the pipeline deck to jacket location and tube turn at the GC 52 CPP:

a. Dive/ROV vessel will reposition to GC 52 CPP.

b. The topside crew of dive/ROV vessel will "cold-cut" the 12" riser just above the(+) 1 O' elevation of the platform and remove a 5 ft. section of the riser. This action is to assist future removal operations for the platform.

c. ROV will locate the 12" tube turn at the base of the riser and 20 ft. of the pipeline.

d. ROV cut the riser 5 ft. above the natural bottom, cut the pipeline 20 ft. from the tube-turn and recover the tube turn to the surface.

e. The open pipeline end will be plugged (using a plumber's plug or similar devise) to prevent spillage.

f. The ROV will place protective concrete mat over end to provide cover.

g. The ROV will take reading on top of the protective concrete mat.

h. The dive/ROV vessel will demob from location.



Sheet 14of14

Note: Ends of riser bend and pipe sections are to be wrapped with plastic, checked for NORM and sealed to prevent spillage during transport. Divers/ROV will supply the on-site Company Representative with a drawing detailing work performed and depth readings taken.

Within 30 days after abandonment, a written report to the Regional Supervisor will be submitted that includes a summary of the decommissioning operation (including date is was completed), a description of any mitigation measures taken and a statement signed by authorized representative that certifies the pipeline was decommissioned according to the approved application.

mc offshore petroleum, llc sheet 3of14

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