ins ▁of ▁T az um al . ▁In ▁ 2 0 0 4 , ▁ ▁the ▁side ▁of ▁Str ucture ▁B 1 - 2 ▁col lapsed ▁and ▁the ▁Salvador an ▁Conse jo ▁Nacional ▁para ▁la ▁Cultura ▁y ▁el ▁Arte ▁( CON C ULT UR A ▁- ▁National ▁Council ▁for ▁Culture ▁and ▁Art ) ▁initi ated ▁operations ▁to ▁exc av ate ▁and ▁stabil ise ▁the ▁ru ins . ▁During ▁the ▁first ▁de cade ▁of ▁the ▁ 2 1 st ▁century , ▁two ▁simultane ous ▁arch ae ological ▁projects ▁were ▁initi ated , ▁the ▁investigation ▁of ▁Str ucture ▁B 1 - 2 ▁by ▁CON C ULT UR A ▁and ▁the ▁Pro yect o ▁Ar que ológ ico ▁de ▁El ▁Salvador ▁( PA ES ) ▁by ▁the ▁Japanese ▁University ▁of ▁N ago ya . ▁ ▁Site ▁description ▁All ▁the ▁buildings ▁in ▁the ▁T az um al ▁complex ▁face ▁west . ▁T az um al ▁is ▁believed ▁to ▁possess ▁a ▁Mes o amer ican ▁ball court ; ▁this ▁is ▁based ▁upon ▁the ▁external ▁appearance ▁of ▁two ▁un ex c av ated ▁m ounds ▁that ▁are ▁situated ▁in ▁the ▁north western ▁portion ▁of ▁the ▁site , ▁within ▁a ▁ 2 0 th - century ▁c emetery . ▁One ▁of ▁the ▁m ounds ▁is ▁badly ▁dam aged . ▁Green ▁obs id ian ▁ ▁arte fact s ▁found ▁at ▁T az um al ▁indicate ▁links ▁with ▁central ▁Mexico . ▁ ▁Str ucture ▁B 1 - 1 ▁ ▁Str ucture ▁B 1 - 1 ▁is ▁the ▁principal ▁structure ▁in ▁the ▁T