▁stabil ise ▁the ▁exposed ▁remains ▁( e . g . ▁well s ▁and ▁c ess p its ▁were ▁l ined ▁with ▁B id um ▁and ▁back filled ). ▁Gra vel / pe bb les ▁and ▁other ▁materials ▁have ▁also ▁been ▁introduced ▁by ▁the ▁Author ity ▁for ▁interpret ative ▁purposes . ▁ ▁Appro xim ately ▁ 7 5 0 , 0 0 0 ▁individual ▁arte fact s ▁were ▁recovered ▁from ▁the ▁arch ae ological ▁site ▁during ▁the ▁course ▁of ▁the ▁exc av ation . ▁They ▁are ▁now ▁stored ▁off ▁site . ▁ ▁A ▁youth ▁host el ▁was ▁constructed ▁on ▁the ▁site , ▁completed ▁in ▁ 2 0 0 9 . ▁This ▁carefully ▁incorpor ated ▁ret ention ▁and ▁display ▁of ▁the ▁arch ae ological ▁resource , ▁including ▁elev ating ▁the ▁building ▁above ▁ground ▁level , ▁re construct ing ▁the ▁original ▁lan ew ays ▁as ▁thorough f ares ▁through ▁the ▁building ▁and ▁site , ▁and ▁construction ▁of ▁a ▁Big ▁Dig ▁building ▁for ▁education ▁about ▁the ▁dig ▁site . ▁O ng o ing ▁resources ▁were ▁also ▁committed ▁for ▁fund ing ▁further ▁interpretation ▁of ▁the ▁early ▁history ▁of ▁the ▁site . ▁ ▁Mod ifications ▁and ▁dates ▁ ▁- 1 9 0 1 vari ous ▁resident ial ▁and ▁commercial ▁uses , ▁demol ition ▁of ▁some ▁buildings ▁as ▁a ▁result ▁of ▁the ▁Dar ling ▁Har bour ▁res um ptions ▁in ▁response ▁to ▁the ▁b ub onic ▁pl ague ▁out break ▁in ▁ 1 9 0 0 . ▁ 1 9 1 7 N orton ▁Griff ith s ▁mach in ery