subchapter_subject: "SUPERFUND, EMERGENCY PLANNING, AND COMMUNITY RIGHT-TO-KNOW PROGRAMS"
part_code: "355"
part_subject: "EMERGENCY PLANNING AND NOTIFICATION"
subpart_code: "B"
subpart_subject: "Emergency Planning"
section_number: "355.14"
section_subject: "Do I have to aggregate extremely hazardous substances to determine the total quantity present?"
cfr_reference: "40 CFR 355.14"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Parts 300 to 399"
revised_date: "Revised as of July 1, 2019"
publication_date: "As of July 1, 2019"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
---
You must aggregate (i.e., add together) the amounts of each EHS at your facility to determine if a TPQ is present. This means that, for a particular EHS, you must determine the total amount present at any one time at your facility by adding together the quantity of pure EHS and the quantity contained in all mixtures, regardless of location, number of containers, or method of storage. You do not have to count an EHS in a mixture if the concentration of that EHS is less than or equal to one percent.