Maximum Daily Amount
For each hazardous substance that you are reporting, determine the maximum amount present at your facility on any single day during the reporting period.
Example - You received one large shipment of a liquid hazardous substance last year. The shipment filled five 5,000-gallon storage tanks. You multiply 5,000 gallons by five to get a total of 25,000 gallons. This is your maximum daily amount and is the most first responders should expect to encounter at your facility.
Average Daily Amount
For each hazardous substance that you are reporting, estimate the average amount that was present at your facility during the year. Below are two methods that can be utilized to determine the average amount.
- Total all daily amounts and divide by the number of days the chemical was present on the site.
Example - The 25,000-gallon shipment you received last year was gradually used up and completely gone in 315 days. The sum of the daily volume levels in the tank is 4,536,000 gallons. By dividing 4,536,000 gallons by 315 days on-site, you calculate an average daily amount of 14,400 gallons.
- Divide the sum of the maximum daily amount and the minimum daily amount by two.
Example – Four of the five 5,000 gallons tanks of a hazardous substance were used before an order to refill the tanks was placed. The sum of 5,000 (the minimum amount) and 25,000 (the maximum amount) is 30,000. Dividing this by two, you calculate an average daily amount of 15,000 gallons.
Whether you use one of these methods or another method, you should ensure that first responders have accurate information on the amount they will likely encounter on any given day if the substance is onsite.
If you have further questions about reporting substances in the proper amounts, please contact the Community Right to Know Program at 503-378-6835 or 800-454-6125.