However, the basement was prone to periodic water accumulation that resulted in mold growth. The team determined the cause of water accumulation to be damaged foundation drains. Contamination controls and clearance protocols were established for remediation of mold-impacted areas. One occupant appears to have an anaphylactic reaction. Initially, the problem appears to be due to odor from wet insulation in the penthouse on the roof.
Water also has petroleum-like odor.
Visual inspection of the clinic reveals 11 openings in the sewer system. Smoke testing of the system identifies four more openings. Openings are sealed and the building is reoccupied. Smoke testing of a plumbing system can be a valuable tool to identify or rule out openings in the sewer system. In both of these cases, traditional industrial hygiene monitoring techniques were not able to identify the source of the problem.