in june 1993, asbestos contractors started to remove the asbestos insulation and tiling. about 90 students had classes in these rooms; 10 students and teachers complained of odors in them. the district consulted turnkey environmental consultants of mount prospect, illinois, to sample the air for contaminants. in 1993, turnkey submitted a report stating that the levels of alkanes were 133 times lower than the permissible exposure limit set by the united states occupational safety and health administration. the floors were sealed again but odor complaints still resumed. students and teachers were moved out of these rooms and the floors were shot blasted and sealed with latex-epoxy paint.