▁le ach ate ▁from ▁the ▁nearby ▁city ▁land fill ▁for ▁many ▁years , ▁until ▁in ▁December ▁ 2 0 1 9 ▁when ▁the ▁land fill ▁was ▁finally ▁closed ▁and ▁a ▁protection ▁wall ▁was ▁completed . ▁ ▁References ▁ ▁Category : R ivers ▁of ▁Roman ia ▁Category : R ivers ▁of ▁Cl uj ▁County <0x0A> </s> ▁Con crete ▁ch ipping ▁is ▁a ▁process ▁which ▁requires ▁trained ▁ch ipp ers ▁or ▁a ▁robot ically - control led ▁machine ▁with ▁an ▁Ult ra ▁High ▁Press ure ▁water ▁source ▁( 2 0 , 0 0 0 ▁p si ) ▁to ▁enter ▁the ▁drums ▁of ▁ready - mix ▁concrete ▁tr uck s ▁and ▁central ▁mix ers ▁to ▁break ▁away ▁the ▁d ried ▁concrete ▁along ▁the ▁drums ’ ▁walls . ▁ ▁Human ▁teams ▁use ▁tools ▁such ▁as ▁the ▁hand h eld ▁jack ham mer ▁and ▁ch is el ▁to ▁manually ▁remove ▁hard ened ▁material . ▁ ▁The ▁robot ically ▁controlled ▁machine , ▁commer cially ▁referred ▁to ▁as ▁a ▁" Ready ▁Jet ," ▁removes ▁the ▁d ried ▁concrete ▁by ▁cutting ▁the ▁concrete ▁with ▁ult ra ▁high ▁pressure ▁water , ▁causing ▁the ▁concrete ▁to ▁del amin ate ▁from ▁the ▁interior ▁of ▁the ▁mix er ▁drum . ▁The ▁robot ically ▁controlled ▁machine ▁is ▁operated ▁by ▁a ▁human ▁outside ▁of ▁the ▁ready - mix ▁concrete ▁drum . ▁Human ▁teams , ▁with ▁help ▁from ▁sh ov els , ▁wheel bar rows ▁and ▁the ▁like , ▁then ▁p ile ▁the ▁disc arded ▁concrete ▁on ▁the ▁ground , ▁where ▁it ▁can ▁either ▁be ▁ha u led