세척 작업에 사용되지 않은 물질 중 chloroform은 1개 시료에서 검출되었는데, 22분 동안의 농도가 3.79 ppm였다.
Of the substances that were not used in the cleaning operation, chloroform was detected in one sample, and the concentration for 22 minutes was 3.79 ppm.