Durocher Marine

Subsea Cable Ser vices

A Division of

Lead With Safety!

Introduction to the Kokosing GroupDurocher Marine is a Division of Kokosing Industrial, which is part of theKokosing Group. The Group is a family owned business founded in 1951 and isthe largest contractor in Ohio. Kokosing offers a wide range of constructionservices. Below is a listing of important financial and bonding data regardingthe Kokosing Group.

The Kokosing Group includes the following companies:

In 2015 the Kokosing Group was ranked 59th by ENR.

Annual construction revenue is over $1 Billion

The company has assets worth in excess of $300 Million

Aggregate bonding capacity is $1 Billion +

Single project bonding capacity is $200 Million

Annual employment greater than 1,500 personnel

Kokosing Industrial is a Union Contractor

Throughout our history we have successfully installed over 60 subsea cable systems,including power, telecommunications, and fiber optic cables. We have workedthroughout North America and the Caribbean. Our longest continuous installationis 28 miles. We’ve installed power cables ranging in voltage from 15kV to 230kV.

List of Services:

Subsea Cable Services

Budgeting and Firm Pricing

Pre Route Survey and Design

Route Investigation and Clearance

Pre Lay Grapnel Run

As Built Final Survey

Cable Installation

Offshore Cable Installation

Cable Removal

Cable Burial

Shore End Installations

Cable Protection

Cable Repair

Cable Inspection Services

Turn Key Installations

We have removed cable for routeclearance, permit requirements, and theremoval of out-dated oil-filled cables. Thecable materials can be salvaged for scrap,if of value, but will always be disposed ofproperly in an environmentallyacceptable manner.

We have installed High & Medium VoltagePower cables, Telecommunication cablesand Fiber Optic cables throughout NorthAmerica. Our cables have been installedon the East Coast, West Coast, Gulf Coast,Caribbean, Great Lakes, Inland Lakes, andCanada. Whether the cables have beendelivered on reels, in tubs that require aturntable, or coiled on a lay vessel. Wehave the ability and experience to get theproject accomplished.

Our jet sleds are capable of burial to 4meters. These sleds use high pressurewater to liquefy the trench for the cableinstallation. The sleds cause near zeroturbidity and are environmentallyfriendly. They are fitted with the latestunderwater technology to continuouslymonitor the cable burial and installationin real time. These technologies includelook ahead sonar, heave, pitch and roll,and GPS tracking sensors.

Subsea Cable Ser vices

Cable Burial

Cable Installations

Cable Removal

Carefully landing the cable ends andsecuring them can be a critical part of aninstallation. We self-perform trenchexcavation, winching & cable pulling,backfilling, and vault installation.

At times, subsea cables are inherentlyexposed to a variety of risks. We’veinstalled a multitude of devices to protectcables from those dangers. These includeinstalling bolt-on cast iron split pipe cableprotectors in the surf zone wheretrenching wasn’t possible and in shallowareas where trenching wasn’t allowed. Wehave also placed articulated concrete matsto cover cables for protection and toseparate cables from other utilities likepipelines.

Subsea cables are in a high riskenvironment. Over the years we havebeen involved in several cable repairs.Ships dragging anchor account for themajority of these repairs. DurocherMarine has completed 10+ major cablerepairs in water depths exceeding 200ft.

Cable Protection

Cable Repair

Shore End Installations

Subsea Cable Ser vices (cont’d)

Our portable turntable has a capacityto hold 1,000 tons. The turntable caneasily be trucked and assembled whereneeded to meet project demands. Theturntable is presently 39 ft. in diameter.

Kokosing’s “DP2 System” includes a number ofpropulsion units acting together to achieveaccurate and reliable station keeping. The DP2control system is a Kongsberg K-Pos DP-21.Propulsion is provided by six (6) ThrustMaster500 horse power Modular Hydraulic OutboardPropulsion Units consisting of modular deckmounted azimuthing thrusters, with separatediesel-hydraulic power units and controls.

Special Cable Handling Equipment

Turntable

Dynamic Positioning System – DP2

We have three portable linear cablemachines. Each have remote controlsand a maximum line pull of 12,000 lbs.The units can be configured as a singleunit to increase line pull or synchronizedto work as a single unit. The units areeasily trucked to the project site.

Our larger jet sled is portable andcapable of handling a 5 meter burialtooth. The sled is equipped with digitalsensors to accurately record all burialdata in real time.

Our smaller jet sled is portable andcapable of burial to 2 meters with similarburial recording capacity.

Both sleds are environmentally friendlybecause they create near zero turbidityin the water and have negligible impactto the seabed.

Jet Sleds

Linear Cable Machines

Special Cable Handling Equipment (cont’d)

PROJECT: Subsea installation ofthree 230kV transmission andfiber optic cables between thePotrero and EmbarcaderoSubstations in San Francisco, CA.

The 1,000 ton turntable wasutilized to install the 3 cablesfurnished in individual tubsweighing 320 tons. Cables wereinstalled and buried one at a time.

The lay barge winched the 5 13/16”diameter power and fiber opticcable to the Potrero Substationashore through a pre-installedpipe conduit then simultaneouslylaid and buried to a depth ofbetween 6 and 10 feet by thewater jet plow. At the second end,2100 linear feet of cable wasfloated on air bags and winchedto shore through a pipe conduitto the Embarcadero Substation.This process was then repeatedtwo more times.

Rerouting Power through San Francisco

San Francisco, California

PROJECT: Replacement of sevenoil-filled single conductor cableswith three 138 kV triplex powertransmission cables betweenNorwalk, Connecticut andNorthport, Long Island, NewYork.

Replacement began with theremoval of seven 12 mile longoil-filled single conductor cables(84 total miles). Our marine crewsremoved the cable and deliveredit for salvage to the owner.

Inside the 3 replacement cableswas a 24 fiber optic element. The9” diameter cables weighed70 lb/ft. The 7,000 tons of cablewas delivered, handled, laid, andburied. Each cable was buriedpost-lay.

The North landing requiredcrossing a small island with eachcable. Our lay barge was set upwith a turntable that allowed thedelivery ship to offload and float1.3 miles of cable across theisland to our barge where it wasloaded onto the turntable. Onceloaded, each cable was laid andburied in the shallow water toshore. This process was repeatedfor each cable.

Rebuilding Power Infrastructure around New York City

Long Island Sound, New York

PROJECT: McLean’s MountainWind Farm, Manitoulin Island,Ontario Canada. Installation ofthree 115 kV Armored ElectricCables from Little Current,Ontario across the Little CurrentChannel to the Mainland.

The wind farm is rated toproduce 60MW of electricity from24 GE 2.85MW turbines. Gettingpower to the Provincial Gridrequired crossing the 2,000 ftLittle Current Channel betweenManitoulin and Goat Islands withthree 115kV subsea power cablesand grounds.

Both shorelines requiredextensive excavation toguarantee adequate trenchdepth for the cables. The northshore required 860 ft of ductbank cut into rock. At each end,the subsea cables wereterminated at junction boxes.The cables were laid individually.Upon completion of installingthe cables a stone sub-base,cable separators, and articulatedconcrete mats were added toprotect the exposed cablescrossing the channel.

Getting Green Power to the Grid

Manitoulin Island, Ontario, Canada

PROJECT: Subsea Power CableInstallations for the VirginIsland Water and PowerAuthority (VIWAPA).

The first project includedinstallation of 18,000 ft of 35kvsubsea power cable from St.Thomas to St. Johns. Thesecond project occurred sevenyears after the initialinstallation and paralleled theprevious installation. It was also18,000 ft of 35kv cable.

Both projects were completedin environmentally sensitiveareas. Care was taken to avoidcoral reefs and other sensitiveareas within the cable laycorridor. Both cables were laiddirectly on bottom fromshoreline to shoreline. No burialwas required. Near shore thecables were buried in a trenchand cable protectors wereinstalled to protect the cable inthe shallow water seaward ofthe trench.

Power Cable Installation in Environmentally Sensitive Area

St. Thomas/St. Croix, Virgin Islands

Durocher Marine

958 North Huron Street • Cheboygan, MI 49721 • 231-627-5633

kokosingindustrial.com/marine/cable-services/

2016 Deep Water Wind & National Grid Block Island, Rhode Island (5) 35 KV 28 Miles 902015 Pacific Gas and Electric San Francisco, CA (3) 230KV 14,700 902013 Kerite Cable Company Santa Barbara, CA 25 KV 18,000 2102013 Kerite Cable Company Drummond Island, MI 25 KV 6,200 1102013 McLean's Wind Farm Little Current, Ontario, Canada (3) 115 KV 3,000 352012 Kerite Cable Company Charlevoix, MI 25 KV 4,600 702011 National Grid Captree Island 35 KV 13,268 122011 VIAWAPA St. Thomas, Virgin Islands 35 KV 18,000 1102009 Kerite Cable Company Middle Bass Island, OH 25 KV 4,700 402008 Kerite Cable Company Eleuthera, Bahamas 15 KV 16,600 352008 Northeast Utilities Long Island Sound, NY, CT 138 KV 36 Miles 1202007 Kerite Cable Company South Bass Island, OH (2) 35 KV 17,700 602006 Kerite Cable Company Lake Tahoe, CA 25 KV 3,000 902005 SBC Michigan Straits of Mackinac, MI Fiber Optic 22,000 3502005 Stanford Development Co. Limited Antigua, West Indies (2) 35 KV 13,000 402004 Kerite Cable Company St. Thomas, Virgin Islands 34.5 KV 18,500 60 - 902003 Kerite Cable Company Kelleys Island, OH 15 KV 21,000 702003 Xcel Energy Services, Inc. Madeline Island, WI 15 KV 11,800 1702001 Savannah Electric Savannah, GA (4) 15 kv 4 Miles 4 - 372001 Carolina Power & Light Baldhead Island, NC (2) 35 KV 2,800 702001 Edison Sault Electric Mackinac Island, MI 24 KV 17,000 1802000 So. Carolina Electric & Gas Lake Murray, SC 35 KV 3,000 & 600 702000 Outward Bound Education Center Thompson Island, Boston, MA 15 KV 7,900 301999 Edison Sault Electric St. Ignace, MI (3) 25 KV 18,300 3001999 Presque Isle Electric & Gas Bois Blanc Island, MI 15 KV 24,900 1201999 Great Lakes Energy Beaver Island, MI 35 KV 28 Miles 701999 Wolverine Power Co. Beaver Island, MI Repair 28 Miles 701998 Lee County Electric Coop. N. Fort Myers, FL (4) 15 KV 29,650 351998 USDA Plum Island, NY 35KV 11,000 1201997 Robins Island Preservation Group Robins Island, NY 15 KV 5,800 701995 Lee County Electric Coop. Ft. Myers, FL 25 KV 14,850 351995 Gulf Power Pensacola Beach, FL (4) 25 KV 4,350 381993 Cloverland Electric Sugar Island, MI (4) 25 KV 1,200 651992 Exxon Co. USA Santa Barbara, CA 35 KV 52 Miles 1,2001990 Michigan Bell Telephone Straits of Mackinac, MI Fiber Optic 22,000 3501990 Consumers Power Co. Straits of Mackinac, MI (2) 138 KV 22,000 3501990 Gulf Power Perdido Key, FL (4) 25 KV 1,500 701989 Ohio Edison Catawba Island, OH 35 KV 18,700 601989 Fishers Island Electric Co. Fishers Island, NY 15 KV 18,300 331988 Edison Sault Electric St. Ignace-Mac. Is., MI (4) 25 KV 18,700 3801987 Texas Power & Light Lake Belton, TX 25 KV 6,000 70

Various Cable installations from 1954 - 1990

Year Owner Location Size Length, ft. Depth, ft.

Subsea Cable Installations