Q480. How should the daily oil throughput be determined for onshore production storage tanks in 98.233(j)(1) to compare to the threshold of 10 barrels/day? Is it based on design capacity, maximum daily throughput, or annual average actual daily throughput? Is the throughput re-evaluated annually? If the throughput decreases below this threshold, are the equipment excluded from report under Subpart W?

A480. It is EPA’s intent that the 10 barrels per day of oil throughput referenced in 98.233(j) be based on annual average daily throughput. On an annual basis, the owner/operator must evaluate whether individual well pad produced hydrocarbon liquids falls above or below the equipment threshold and use monitoring methods appropriately. For less than 10 barrels per day of oil throughput on an annual average daily basis, the reporter must determine if 98.233(j)(5) applies.