The EPA prepares the NPL to determine which superfund sites should get primary cleanup attention. Remedial actions can be conducted only on listed sites. The EPA ranks the sites using the site risk factors of the HRS, which is located in Appendix A of the NCP (40 CFR pt. 300 app. A).
States initially develop lists which prioritize sites for remedial action. States revise the lists annually based on some of the risk factors in the HRS (CERCLA §105[A], 42 USC §9605[A]). The lists are submitted to the EPA and contribute towards the NPL's annual revision. The NPL is published in Appendix B of the NCP (40 CFR pt. 300 app. B).
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