international dredging review - boskalis€¦ · international dredging review a crew member...

MAY/JUNE 2009VOLUME 28, NUMBER 3

International Dredging Review

A crew member operates the controls to att ach the floating hose discharge line to thedredge B.E. Lindholm for pumpout to Dewey Beach, Delaware. Story on page 6.

WEDA chaptermeetings. 8.

Dredging projectsin stimulus.Page 9 and beyond.

Miami River projectends, Fox Riverproject begins.Page 36.

IN THIS ISSUE:

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32 International Dredging Review | www.dredgemag.com | May/June 2009

Reader Reply No. 35

When Johan Dolman’ s aggregate dredgingoperation was faced with millions of cubicmeters of contaminated sediment in the early1980’s, his solution to the problem was thebeginning of a process that to date hasprocessed more than 10 million tons of con-taminated material.

His basic idea was to separate, wash and re-use the coarser materials, purify the water forreturn to the waterway, and have on hand onlythe contaminated fines to dispose of.

Dolman’s career began in 1970, when hejoined a marine and shipping company inDordrecht, the Netherlands as manager ofmarine activities. Nine years later he started hisown company – Dolman b.v. – and in the early1980’s he engineered and built the aggregateprocessing equipment himself, producingmaterials in specific sizes for construction. Hedredged from aggregate pits, storing the finematerials in mined-out pits after separating thesaleable products.

But in the mid-1980’ s the Dutch govern-ment began discovering the extent of contami-nants in its lakes and waterways, which includ-ed the fines that Dolman had been depositing inthe pits.

In addition, his permit to dredge sand fromthe IJsselmeer was curtailed when a layer ofcontaminated fines was discovered on top ofthe clean sand throughout the system.IJsselmeer and its adjacent Ketelmeer are freshwater lakes that were formed in 1932 when theZuiderzee was closed by a dike, and land with-in it reclaimed. The IJsselmeer has an area of1100 square meters (nearly 3000 square miles)and is five or six meters (20 feet) deep.

It was necessary to remove and store thecontaminated overburden before he could con-tinue his aggregate operation in the IJsselmeer,and he realized that the overburden containedsand that could be removed and sold. He alsorealized that if only contaminated fines werestored in a CDF (confined disposal facility), itscapacity would be more wisely used.

Dolman devised a method to process thematerial using screens, cyclones and upstreamclassifiers to remove fines from the coarsematerial, chemical separation of the contami-nated fines from the water, and filter presses todry to fines for placement in the IJsseloog, adredged material island with a circular linedCDF in the center within a ring dyke. This isthe containment facility for contaminated sedi-ments dredged from the IJsselmeer and

Ketelmeer. It was built by a consortium, ofwhich Boskalis was part.

In 1987, Dolman received a contract toprocess all the contaminated materials fromAmsterdam’s canals – a job that would take 15years. Meanwhile, he was expanding his com-pany, exporting his processing equipment toGermany and other countries. For six years,starting in 1992, his facility in Hambur gprocessed all the maintenance material fromthe River Elbe – approximately one millioncubic meters per year, contaminated with heavymetals. After being treated with the right poly-mer to get rid of the contaminated fines, thewater was returned to the river and the contam-inants stored in a safe location. A 50-meter -high grassy hill was created by the city ofHamburg to store the dewaterd fine material.

That contract ended when the city built itsown processing facility for dredged material.

Dolman’s Integrated Approach is based onacquiring all possible information about a siteand designing a processing facility based onthat knowledge. The investigation includesphysical and chemical testing of the sedimentsand a survey of historic activities in the area togive an idea of what to expect. Only then is asolution proposed to the client.

Part of his approach is a commitment to beas open as possible with government of ficialsand local residents regarding the contaminantsin the material and all processes. He attributeshis success in large part to this commitment tohonesty and openness, as well as a personalcommitment to healing and protecting the envi-

Concern for the Environment Led DolmanTo Dredged Material Processing

Dolman views his processing equipment atthe Miami River deepening project in 2008.Since the early 1980’ s his equipment hasprocessed more than 10 million tons of con-taminated material.

Dewey Beach, Delaware RestorationSee page 6.


ronment. In aid of this commitment, he took athree-year environmental studies course atIJssel University when he was 39.

In the late 1980’s, as the Dutch governmentwas discovering the extent of polluted sedi-ments in the country, Dolman was working onmaking capital investments to expand his com-pany. Boskalis asked him to become part oftheir group at that time, and he saw it as anopportunity to concentrate on environmentalcleanup instead of managing the company’ sgrowth.

Dolman was familiar with Boskalis, whohad been his customer for years, purchasingsand in exact sizes to place under and over sub-merged tunnels. He accepted Boskalis’ s of ferand the company became Boskalis Dolman.

“The fact that I and my staf f are still withBoskalis (after 20 years) shows a good culturalenvironment in Boskalis,” he said. “Theyrespect my blueprint of environmental think-ing, and they have respected me and my com-mitment to nature and the environment,” hesaid.

With the completion of the Miami Riverproject last October , and the beginning of theFox River project this spring, he sees the possi-bility of a long-term commitment in the UnitedStates.

The Miami project (see related article inthis issue) used a mobile plant that will bestored and can be transported to another loca-tion.

The company has set up an office within theproject headquarters for the Fox River ,Wisconsin cleanup project, which will start thisspring. Bastiaan Lammers, will do projectdevelopment in the U.S. and Canada, whileClaudia Sanders will manage the of fice.Martijn Luth is the Boskalis Dolman managerfor the Fox River project.

Over the past eight months, more than 250people from Boskalis Dolman and subcontrac-tors have engineered and assembled the pro-cessing equipment at the Fox River , inWisconsin – a fixed plant with four times thecapacity of the Miami River plant.

The final results will be the same: separat-ing and cleaning coarse materials, removingcontaminated fines, and thus dramaticallyreducing the volume for disposal. The finalresult is clean water returning to the river , andsand re-used within accepted standards.

“I love the idea of being useful to the envi-ronment,” said Dolman.

International Dredging Review | www.dredgemag.com | May/June 2009 33

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On October 15,2008, Bean Dredg -ing’s excavator Barre -dor Del Rio took thesymbolic “last scoop” of material from the700,000-cubic-yard maintenance dredging/envi ronmental remediation of the Miami River.

Joint venture partners Weston Solutions andBean Environmental designed the $80 millionproject by integrating all elements, includingdredging and materials handling and remedia-tion. Besides restoring a 15-foot depth bank-to-

bank channel on the 5 ½-mile-long waterway ,the project included managing a spectrum ofcontaminants and debris.

Dutch company Boskalis Dolman bv wascontracted to handle and process all thedredged material. Their treatment facility onthe north bank of the river included a berthingarea for sediment bar ges, a shore-mountedcrane that unloaded the material. Flocculantswere added to the material to separate thesolids. The final products were a nearly-dry


Dolman Symposium Marks Completion of Miami,Beginning of Fox River Cleanup

At the opening reception are, from lef t, Christopher Lutz, LaurenPutnam, Barbara Orchard and Joe Corrado, all of Arcadis, withBastiaan Lammers of Boskalis Dolman.

In the project office, job sheets contain satellite photos of the MiamiRiver.

Bastiaan Lammers, lef t, of BoskalisDolman with Neil Geerers of Tetra Tech atthe project site.

Lauw Verschuren of Stuyvesant and HaicoWevers of Boskalis Dolman.

Haico Wevers, another guest, Ancil Taylor,Ken Hayes of Aqua Survey , and JohanDolman in the control room during the tour.

Ancil Taylor of Bean Environment aldescribes the dredging portion of the proj-ect.

This aerial photo of the processing site shows the covered stock-piling areas and a barge being unloaded. The ship moored on theopposite bank illustrates the confined working space of the project.

Bean’s multi-purpose dredge Barredor Del Rio in backhoe modein the Miami River . It will fill the barge in the right of the photo,which will be conveyed to the material processing site. The sym-bolic “last scoop” of the project was t aken on October 15, 2008.The five year , 88 million dollar contract removed 750,000 cubicyards of contaminated sediments from a 5.5-mile stretch of river .


material and runof fwater, which was clar-ified and re-used inthe thickening tanks.

On October 17 and18, CEO Johan Dol -man held a sympo-sium in Miami todescribe his compa-ny’s part in the dredg-ing project.

An internationalgroup attended theopening reception onOctober 16, includingNetherlands MiamiConsul General Luci -ta Moenir Alam;Johan Dolman, gener-al manager of Bos -kalis Dolman; andrepresentatives fromthe dredging and engi-neering companies onthe Miami River andFox River , Wisconsinprojects.

The next morningwas devoted to talksabout the two projects– Miami River andFox River , Wisconsin(Dolman’s next big

project) and the afternoon to a tour of the Miami River material process-ing site and equipment.

Dolman welcomed the guests, and introduced the keynote speaker ,Eelco Dykstra, professor in International Emergency Management at theInstitute for Crisis, Disaster and Risk Management at Geor geWashington University. He talked about climate change and its effects onwater management, with suggestions how the United S tates and theNetherlands could deal with these ef fects. He also described the resultsof a study on risk and water management in 136 port cities.

Stephan McGee, vice president of Tetra Tech IC Inc., and GlennGreen, director of Business Develop ment at J.F. Brennan described theFox River project in Operable Units 2 through 5, which is starting thisspring. The project includes dredging and dewatering more than 3.5 mil-lion cubic yards of PCB-contaminated sediment in a project expected totake seven years. Dolman’ s membrane plate and frame presses will

International Dredging Review | www.dredgemag.com | May/June 2009 37


The entrance to the material treatment plant on the north shore ofthe Miami River . This is a port able plant and can be dismantledand moved to another project.

In this thickener, polymer is combined withthe slurry prior to dewatering, stockpilingand removal of the dredged material.

A conveyor belt transfers the final nearly-dry product to a stockpile. It will be hauledby truck to a landfill.

The stockpiled material is covered untilhauled to a safe disposal site by truck.

Dolman ladles material from the thickeningtank to check on the progress of the clarifi-cation, while S teve McGee of TetraTechlooks on. McGee is the project manager ofthe Fox River dredging and remediationproject.



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Consulting Ltd. 171 33Arc Surveying & Mapping Inc. 210 35ARCADIS 184 11, 33Ashtead Technology 345 17Brockton Equipment/Spilldam Inc. 197 34Cable Arm Clamshell 168 40Campbell Scientific, Inc. 321 27Cashman Dredging & Marine 228 19Central Dredging Association 288 5Dredge & Marine Corp. 283 34Dredge Brokers LLC 295 10, 34Dredging Supply Co. Inc. 178 30Dredging Supply Rental Inc. 256 34Dredge Technology Corporation 89 34Eddelbuttel & Schneider GmbH 131 7Elastec/American Marine 158 34Ellicott Dredges LLC 66 2EMSTEC GmbH & Co KG 278 39Great Lakes Dredge & Dock 55 4Hagglunds Drives 19 14Hagler Systems 16 34Herrin Design & Manufacturing Co. 25 26Hyatt Survey Services 303 31Hydrographic Society of America 179 35Hydrographic Surveys 102 35Hypack, Inc. 217 12Jan De Nul Group 317 8KLM Mining Inc. 103 35Kruse Controls Inc. 225 27LeTourneau Technologies 183 18Liebherr Mining Equipment Co. 297 13Manson Construction Co. 52 21McKim & Creed PA 20 33Mineral Processing Services, LLC 332 20Moffatt & Nichol 248 33Naylor Pipe Company 35 32Pearce Group 112 26Phoenix Process Equipment Co. 77 30Pipe & Tube Supplies, Inc. 177 23Remsa, Inc. 186 35Rotonics Manufacturing Inc. 72 24Salem-Republic Rubber Co. 37 35Sanders & Associates, Inc. 207 33Sea Wolf Marine

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dewater the sedimentafter separation of sandfor beneficial use.McGee is project man-ager for the Fox RiverClean-Up.

Ancil Taylor, presi-dent of Bean Envi -ronmental Inc. andBastiaan Lam mers,project manager forStuyvesant Dredg ingfor the Miami RiverProject discussed theMiami River project.The Barredor del Rioremoved more than700,000 cubic yards ofsediment. BoskalisDolman’s treatmentincluded coarse frac-tion separation, sandseparation andmechanical dewater-ing by belt filter press-es.

Finishing up thetalks, Ir. Haico H.A.G.Wevers, managingdirector of BoskalisDolman bv describedthe company’ s soilwashing centers(SWC); the integrated approach to dredgingand material treatment, which includes plan-ning, engineering and design; beneficial re-useexamples and Brownfield development proj-ects. He gave examples of a mobile sedimentprocessing plant, dewatering by membrane fil-ter presses (to be used on the Fox River),Sludge Mattress®, a lightweight constructionof dredged sediments, and the sustainable con-fined disposal facility (DCF) management R –enhanced vacuum consolidation of fine-grained sludges.

Boskalis Dolman is committed to providinglarge-scale treatment of dredged sediment.

In the afternoon, the group boarded buses tothe project site, where they viewed the sedi-ment remediation equipment on the north bank

of the Miami River . Visitors watched thegauges in the control room, and followed thecourse of the material from when it wasunloaded from the bar ges through to the finaldischarge of material onto the stockpile, await-ing transport to a lined placement site.

Attendees were environmental engineers,consulting companies, survey companies,dredging companies and others interested inenvironmental cleanup and sediment treatment.The group gathered for a final dinner thatevening and the golfers among them teed off atthe adjacent golf course the next morning.

At the opening night reception are, from lef t, Glenn Green of J.F.Brennan, Terri Blackmar of TetraTech, Paul LaRosa of AnchorEnvironmental and Dewey Hunter of Ciba (now BASF).

Claudia Sanders with her father Harry Sanders, both of BoskalisInternational, and John Lally of Lally Consulting.

Clay Patmont of Anchor Environment al,Terri Blackmar of Tetra Tech and TonyBinsfeld, president of J.F. Brennan at the alfresco dinner the final evening.

Johan Dolman, Lucit a Moenir Alam(Netherlands Consulate General), Dr .Eelco Dykstra, and Marsha Cohen, editorof Terra et Aqua.


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