- comp an ies ▁that ▁were ▁established ▁in ▁the ▁ 1 9 8 0 s : ▁N V ▁So ils ▁was ▁a ▁special ised ▁company ▁for ▁soil ▁was hing ▁and ▁in - s itu ▁soil ▁rem ed iation ▁techniques ; ▁N V ▁S ilt ▁had ▁developed ▁expert ise ▁in ▁s ilt ▁rec y cling ▁and ▁sl ud ge ▁treatment ; ▁and ▁N V ▁Bit umar ▁focused ▁on ▁bit umin ous ▁materials ▁for ▁hyd ra ul ic ▁engineering ▁and ▁f ibr ous ▁stone ▁as ph alt ▁for ▁coast al ▁engineering ▁works . ▁DE C ▁is ▁special ised ▁in ▁ground water - ▁and ▁soil ▁rem ed iation ; ▁sed iment ▁treatment ; ▁rec y cling ▁and ▁land fill ▁techniques ; ▁environmental ▁d red ging ; ▁and ▁the ▁re development ▁of ▁brown fields . ▁DE C ▁own s ▁and ▁oper ates ▁seven ▁permitted ▁soil - ▁and ▁sed iment ▁rec y cling ▁cent res ▁in ▁Belg ium , ▁including ▁in ▁the ▁ports ▁of ▁Ant wer pen , ▁Ze ebru g ge ▁and ▁Gh ent . ▁In ▁legal ▁terms , ▁DE ME ▁Environment al ▁Cont ract ors ▁( DE C ) ▁is ▁part ▁of ▁DE ME - control led ▁E c oter res ▁Hold ing , ▁in ▁which ▁all ▁environmental ▁activities ▁of ▁DE ME ▁are ▁brought ▁together . ▁Other ▁DE ME - environment al ▁companies ▁under ▁E c oter res ▁Hold ing ▁include ▁de ▁V ries ▁& ▁van ▁de ▁Wiel , ▁with ▁activities ▁in ▁the ▁Netherlands ; ▁E c oter res ▁which ▁is ▁based ▁in ▁the ▁Wal lo