Figure 1

Floor plan of the water tanks in the basement of the building adjacent to the garage. The water tank that was repaired and where a fan was positioned to accelerate the drying the paint is marked as A. The drinking water tank that was contaminated with vapors from Tank A is marked as B. C indicates the water pump for Tank A. D indicates the water pump for Tank B. The continuous blue lines indicate the walls separating the tanks that at the time of the accident were not reaching the ceiling. The continuous red lines indicate the walls separating the tanks from the remaining building and from the water tanks. The black dotted lines indicate the windows installed after the accident to facilitate access to the water tanks. The arrows indicate the direction of the vapors from water tank A at the time of the accident.