Under the settlement, Costco will implement a refrigerant management system to prevent and repair coolant leaks and reduce its corporate-wide average leak rate by one-fifth (from 24 percent in 2011 to 19 percent or less by 2017). Costco will install and operate environmentally friendly glycol secondary loop refrigeration systems and centrally monitored refrigerant leak detection systems at all new stores for three years. As required by the settlement, Costco will retrofit commercial refrigeration equipment at 30 stores, reducing ozone-depleting and greenhouse gas emissions.