Final Scope Documents for High-Priority Chemicals Undergoing Risk Evaluation

In December 2019, EPA designated 20 High-Priority substances to undergo risk evaluation under the Toxic Substances Control Act (TSCA). The final scope documents for these substances are available below. Also below is EPA's response to comments received on the draft scope documents, released in April 2020.  You can find additional information in the docket relevant to this action (EPA-HQ-OPPT-2019-0131) or in the individual dockets for each of the chemicals. View the final list of businesses subject to fees for these 20 risk evaluations.

• Summary of and Response to Comments on Draft Scope Documents (pdf) (937.36 KB)
• 1,3-Butadiene, CASRN 106-99-0, Final scope (pdf) (2.28 MB)
• p-Dichlorobenzene (Benzene, 1,4-dichloro-), CASRN 106-46-7, Final scope (pdf) (2.43 MB)
• 1,1-Dichloroethane, CASRN 75-34-3, Final scope (pdf) (2.44 MB)
• 1,2-Dichloroethane, CASRN 107-06-2, Final scope (pdf) (2.64 MB)
• trans-1,2- Dichloroethylene, CASRN 156-60-5, Final scope (pdf) (2.65 MB)
• 1,2-Dichloropropane, CASRN 78-87-5, Final scope (pdf) (2.07 MB)
• Ethylene dibromide (Ethane, 1,2-dibromo-), CASRN 106-93-4, Final scope (pdf) (2.53 MB)
• 1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-hexamethylcyclopenta [g]-2-benzopyran (HHCB), CASRN 1222-05-5, Final scope (pdf) (2.45 MB)
• 4,4'-(1-Methylethylidene)bis[2, 6-dibromophenol] (TBBPA), CASRN 79-94-7, Final scope (pdf) (2.78 MB)
• Triphenyl Phosphate (TPP), CASRN 115-86-6, Final scope (pdf) (2.87 MB)
• 1,1,2-Trichloroethane, CASRN 79-00-5, Final scope (pdf) (2.78 MB)
• Tris(2-chloroethyl) phosphate (TCEP), CASRN 115-96-8, Final scope (pdf) (2.6 MB)
• Diethylhexyl Phthalate CASRN 117-81-7, Final scope (pdf) (3.15 MB)
• Dicyclohexyl Phthalate, CASRN 84-61-7, Final scope (pdf) (2.89 MB)
• Diisobutyl Phthalate, CASRN 84-69-5, Final scope (pdf) (2.59 MB)
• Butyl Benzyl Phthalate, CASRN 85-68-7, Final scope (pdf) (2.49 MB)
• Dibutyl Phthalate, CASRN 84-74-2, Final scope (pdf) (3.08 MB)
• Phthalic Anhydride, CASRN 85-44-9, Final scope (pdf) (2.38 MB)
• o-Dichlorobenzene (Benzene, 1,2-dichloro-), CASRN 95-50-1, Final scope (pdf) (2.23 MB)
• Formaldehyde, CASRN 50-00-0, Final scope (pdf) (3.36 MB)