▁or ▁more . ▁They ▁control ▁all ▁communic ations ▁on ▁the ▁incident ▁ground ▁and ▁provide ▁a ▁single ▁point ▁of ▁contact ▁for ▁the ▁control ▁room ▁and ▁Inc ident ▁Command ers . ▁ ▁Environment al ▁Units ▁and ▁Inc ident ▁Support ▁Units ▁( Pr ime ▁M over ) ▁The ▁Environment al ▁Units ▁( E U ) ▁and ▁Inc ident ▁Support ▁Units ▁( IS U ) ▁( Pr ime ▁M over ) ▁are ▁used ▁to ▁provide ▁log ist ical ▁support ▁to ▁large ▁inc idents ▁and ▁carry ▁additional ▁equipment ▁that ▁comple ments ▁what ▁is ▁carried ▁on ▁front - line ▁app li ances . ▁They ▁carry ▁a ▁large ▁range ▁of ▁special ▁equipment ▁for ▁cont rolling ▁chemical ▁sp ills ▁and ▁protect ing ▁the ▁environment . ▁ ▁Water ▁car rier ▁ ▁The ▁Service ▁uses ▁a ▁number ▁of ▁water ▁carri ers ▁( W r C ), ▁which ▁enable ▁large ▁quantities ▁of ▁water ▁to ▁be ▁transport ed ▁to ▁support ▁app liance ▁in ▁rural ▁areas ▁or ▁where ▁additional ▁water ▁is ▁required ▁such ▁as ▁at ▁a ▁fire ▁on ▁the ▁motor way ▁where ▁water ▁supplies ▁could ▁be ▁sparse . ▁Each ▁vehicle ▁holds ▁ 9 , 0 0 0   lit res ▁of ▁water . ▁ ▁A ▁number ▁of ▁them ▁also ▁carry ▁ 1 , 0 0 0   lit res ▁( 2 2 0   g all ons ) ▁of ▁fire f ight ing ▁fo am ▁( water ▁fo am ▁car rier ; ▁W FC ). ▁ ▁H ose ▁layer ▁The ▁F RS ▁has ▁three ▁h ose ▁lay ing ▁vehicles ▁which ▁are ▁used ▁to ▁enable ▁the ▁p