▁the ▁cy an ide ▁inf ested ▁former ▁Gas ▁Works ▁site ▁in ▁Dublin ▁D ock land , ▁Ireland ; ▁at ▁the ▁Avenue ▁C oking ▁Works ▁site ▁near ▁Ch ester field , ▁UK ; ▁and ▁the ▁de cont am ination ▁of ▁the ▁London ▁Olympics ▁ 2 0 1 2 ▁site ▁in ▁Str at ford . ▁In ▁the ▁ 2 0 0 0 s ▁DE ME ▁Environment al ▁Cont ract ors ▁( DE C ) ▁were ▁also ▁active ▁in ▁Sweden ▁with ▁clean ing - up ▁the ▁mer cur y ▁cont am ination ▁in ▁the ▁Sv arts jö ▁la kes ▁near ▁H ult sf red ; ▁removing ▁mer cur y ▁and ▁dio x ine ▁from ▁a ▁site ▁in ▁Beng ts f ors ; ▁and ▁further ▁in ▁Fa vern ik , ▁S öder ham n ▁and ▁G ä v le . ▁ ▁Or ders ▁in ▁ 2 0 1 0 ▁On ▁ 1 6 ▁March ▁ 2 0 1 0 ▁DE ME ▁started ▁major ▁d red ging ▁works ▁for ▁D P ▁World ' s ▁London ▁Gate way , ▁the ▁UK ' s ▁new ▁deep ▁sea ▁port ▁and ▁log istics ▁park ▁at ▁ 2 5 ▁miles ▁east ▁of ▁Central ▁London ▁on ▁the ▁river ▁Th ames . ▁DE ME ▁is ▁d red ging ▁a ▁ 3 0 0 m ▁wide ▁channel ▁to ▁a ▁depth ▁between ▁ 1 4 . 6 m ▁and ▁ 1 6 . 5 m ▁while ▁the ▁est u ary ▁is ▁currently ▁around ▁ 1 1 m ▁deep . ▁Over ▁a ▁distance ▁of ▁ 1 0 0