Q: A:	What is meant by the threshold planning quantity (TPQ) of a hazardous chemical? Only extremely hazardous substances (EHSs) have TPQs. All other hazardous chemicals have a threshold of 10,000 pounds under the SARA Title III requirements.
Q: A:	Are retail gasoline stations exempt from filing Tier II reports? Retail gasoline stations are exempt from filing Tier II reports only if the gasoline and diesel fuel stored are less than 75,000 and 100,000 gallons respectively.
Q: A:	How are chemical mixtures reported? Mixtures are reported by using either of these options: Calculating the quantity of the hazardous chemical components in each chemical mixture Reporting the total quantity of each chemical mixture