ath od ic ▁protection , ▁before ▁placing ▁a ▁ ▁thick ▁low - sl ump ▁dense ▁concrete ▁overlay . ▁The ▁exercise ▁closed ▁half ▁the ▁lan es ▁for ▁four ▁months , ▁and ▁cost ▁about ▁$ 3 m . ▁ ▁In ▁the ▁mid - 1 9 9 0 s , ▁the ▁bridge ▁under w ent ▁se ism ic ▁up gr ades , ▁which ▁compr ised ▁def ic ient ▁bear ings , ▁pi ers ▁and ▁found ations , ▁and ▁potential ▁soil ▁li que f action . ▁The ▁work ▁included ▁ 8 0 0 ▁stone ▁columns ▁installed ▁along ▁either ▁side ▁of ▁the ▁bridge ▁for ▁ground ▁improvement . ▁Richmond , ▁about ▁ ▁met re ▁above ▁sea ▁level , ▁requires ▁d rain age ▁and ▁flo od ▁protection . ▁To ▁this ▁end , ▁Gra uer ▁Road ▁was ▁raised ▁to ▁ 4 . 7 m , ▁which ▁would ▁handle ▁a ▁one - met re ▁rise ▁in ▁sea ▁level . ▁At ▁the ▁road ▁per imeter , ▁the ▁installation ▁of ▁a ▁buried ▁steel ▁sheet ▁p ile ▁wall ▁will ▁ensure ▁the ▁bridge ▁pi ers ▁remain ▁flexible ▁in ▁a ▁se ism ic ▁event . ▁The ▁road ▁base ▁compr ises ▁p um ice ▁for ▁light ▁weight ▁and ▁d rain age . ▁The ▁project ▁was ▁completed ▁in ▁ 2 0 1 4 ▁for ▁the ▁opening ▁of ▁the ▁Mc Ar thur G len ▁out let ▁m all . ▁ ▁In ▁ 2 0 0 8 , ▁Trans link ▁added ▁a ▁bus ▁l ane ▁on ▁Russ ▁Baker ▁Way , ▁between ▁Gilbert ▁Road ▁and ▁C ess na ▁Drive . ▁To ▁respond