40 CFR §267.73

1. (a)You must keep a written operating record at your facility.
2. (b)You must record the following information, as it becomes available, and maintain the operating record until you close the facility:
   1. (1)A description and the quantity of each type of hazardous waste generated, and the method(s) and date(s) of its storage and/or treatment at the facility as required by Appendix I of 40 CFR part 264;
   2. (2)The location of each hazardous waste within the facility and the quantity at each location;
   3. (3)Records and results of waste analyses and waste determinations you perform as specified in §§ 267.13, 267.17, and 40 CFR 264.1034, 264.1063, 264.1083, and 268.7;
   4. (4)Summary reports and details of all incidents that require you to implement the contingency plan as specified in § 267.58(b));
   5. (5)Records and results of inspections as required by § 267.15(d) (except you need to keep these data for only three years);
   6. (6)Monitoring, testing or analytical data, and corrective action when required by subpart F of this part and §§ 267.191, 267.193, 267.195, and 40 CFR 264.1034(c) through 264.1034(f), 264.1035, 264.1063(d) through 264.1063(i), 264.1064, 264.1088, 264.1089, and 264.1090;
   7. (7)All closure cost estimates under § 267.142;
   8. (8)Your certification, at least annually, that you have a program in place to reduce the volume and toxicity of hazardous waste that you generate to the degree that you determine to be economically practicable; and that the proposed method of treatment or storage is that practicable method currently available to you that minimizes the present and future threat to human health and the environment;
   9. (9)For an on-site treatment facility, the information contained in the notice (except the manifest number), and the certification and demonstration, if applicable, required by you under 40 CFR 268.7; and
   10. (10)For an on-site storage facility, the information in the notice (except the manifest number), and the certification and demonstration, if applicable, required by you under 40 CFR 268.7.
   11. (11)For an off-site treatment facility, a copy of the notice, and the certification and demonstration, if applicable, required by the generator or the owner or operator under § 268.7 or § 268.8;
   12. (12)For an off-site storage facility, a copy of the notice, and the certification and demonstration, if applicable, required by the generator or the owner or operator under § 268.7 or § 268.8.