An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Federal Register Notice: Interim Final Amendments to Groundwater Monitoring Requirements for Hazardous Waste Surface Impoundments

With this notice, EPA promulgated, in interim final form, amendments to the groundwater monitoring standards for certain hazardous waste surface impoundments used to neutralize corrosive wastes. The amendments provided for a waiver of these standards for any surface impoundment that:

  1. Contains wastes which are hazardous only because they exhibit the corrosivity characteristic and contains no other hazardous wastes, and
  2. rapidly neutralizes the wastes so that there is no potential for migration of any hazardous waste out of the impoundment.  
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.