Okla. Admin. Code § 460:15-1-30 – Noxious or toxic chemicals

(a) Noxious or toxic chemicals shall not be stored underground.
(b) An approved respirator and protective clothing shall be used when handling any of the following chemicals:
1. (1) Carbon Tetrachloride
2. (2) Phenol
3. (3) 4-Nitrobiphenyl
4. (4) Alpha-naphthylamine
5. (5) 4, 4-Methylene Bis (2 chloroaniline)
6. (6) Methyl-chloromethyl ether
7. (7) 3, 3-Dichlorobenzidine
8. (8) Bis (chloromethyl) ether
9. (9) Beta-napthylamine
10. (10) Benzidine
11. (11) 4-Aminodiphenyl
12. (12) Ethyleneimine
13. (13) Beta-propiolactone
14. (14) 2-Acetylaminoflourene
15. (15) 4-Dimethylaminobenzene, and
16. (16) N-Nitrosodimethylamine