사고가 난 다세대주택 공사장은 폭 50m에 높이 20m짜리 흙막이(옹벽)를 설치하는 공사가 80% 가량 진행된 상태였다.
At the multiplex housing construction site, where the accident occurred, about 80% of the construction of 50m wide and 20m high retaining walls (a revetment) was carried out.