Which of the following should NOT be included in a mold control program?

The correct answer highlights that spraying with a 100 mg/L quaternary ammonium compound should not be included in a mold control program. This concentration is generally considered too low to be effectively antimicrobial against mold. For a mold control program to be effective, concentrations used should be significantly higher to ensure effective elimination of mold spores and prevent their growth.

In contrast, the other methods listed are more suitable for a mold control program. Spraying with a 5,000 mg/L sodium hypochlorite solution is effective due to its strong disinfectant properties, particularly against mold. Re-spraying with a 400 to 500 mg/L quaternary solution weekly helps maintain a level of antimicrobial action that can help deter mold growth over time. Cleaning the affected area with an alkaline detergent is also advisable, as it removes organic materials that can support mold growth while preparing the surface for further treatment.

The effectiveness of mold control measures largely depends on the proper concentrations and types of chemical agents used, making the selection of the right concentration critical in maintaining a mold-free environment.