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CDC Legionella toolkit

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DEVELOPING A LEGIONELLA WATER MANAGEMENT PROGRAM 15 5 Establish Ways to Intervene When Control Limits Are Not Met CORRECTIVE ACTION EXAMPLES Building water systems are dynamic. You should plan for your monitoring results to vary over time and be prepared to apply corrective actions. Corrective actions are taken in response to systems performing outside of control limits. The following are examples of corrective actions. Example 1—Biofilm growth in the decorative fountain 1. During her weekly inspection of the fountain in the first floor lobby, Michelle Patterson notes that the fountain walls have accumulated a slimy growth. D E T E R G E N T 2. As dictated by her water management program, Michelle immediately shuts off the fountain, drains it to the sanitary sewer, and scrubs it with a detergent recommended by the manufacturer. 2.0 3. She then follows the program's start up procedure to refill the fountain with water and checks the residual disinfectant levels to make sure that they are within control limits. 4. Michelle documents her observations and the performance of interim cleaning in her log book. She informs her supervisor. Disclaimer: Example content is provided for illustrative purposes only and is not intended to be relevant to all buildings. Reference: ASHRAE 188: Legionellosis: Risk Management for Building Water Systems June 26, 2015. ASHRAE: Atlanta. www.ashrae.org

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