40 CFR §262.209

1. (a)Large quantity generators and small quantity generators—an eligible academic entity must ensure that a trained professional makes a hazardous waste determination, pursuant to § 262.11, for unwanted material in any of the following areas:
   1. (1)In the laboratory before the unwanted material is removed from the laboratory, in accordance with § 262.210;
   2. (2)Within 4 calendar days of arriving at an on-site central accumulation area, in accordance with § 262.211; and
   3. (3)Within 4 calendar days of arriving at an on-site interim status or permitted treatment, storage or disposal facility, in accordance with § 262.212.
2. (b)Very small quantity generators. An eligible academic entity must ensure that a trained professional makes a hazardous waste determination, pursuant to § 262.11(a) through (d), for unwanted material in the laboratory before the unwanted material is removed from the laboratory, in accordance with § 262.210.