40 CFR § 355.16 - How do I determine the quantity of extremely hazardous substances present for certain forms of solids?

---
identifier: "/us/cfr/t40/s355.16"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 355.16 - How do I determine the quantity of extremely hazardous substances present for certain forms of solids?"
title_number: 40
title_name: "Protection of Environment"
section_number: "355.16"
section_name: "How do I determine the quantity of extremely hazardous substances present for certain forms of solids?"
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "J"
subchapter_name: "SUPERFUND, EMERGENCY PLANNING, AND COMMUNITY RIGHT-TO-KNOW PROGRAMS"
part_number: "355"
part_name: "EMERGENCY PLANNING AND NOTIFICATION"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sections 302, 303, 304, 325, 327, 328, and 329 of the Emergency Planning and Community Right-to-Know Act of 1986 (EPCRA) (42 U.S.C. 11002, 11003, 11004, 11045, 11047, 11048, and 11049)."
regulatory_source: "73 FR 65462, Nov. 3, 2008, unless otherwise noted."
cfr_part: "355"
---


# 355.16 How do I determine the quantity of extremely hazardous substances present for certain forms of solids?

For the three forms of solids that are listed in § 355.15(a)(1) through (3), use these instructions to determine the quantity of extremely hazardous substance present:

(a) *Solid in powdered form with a particle size less than 100 microns.* Multiply the weight percent of solid with a particle size less than 100 microns in a particular container by the total weight of solid in the container.

(b) *Solid in solution.* Multiply the weight percent of the non-reactive solid in solution in a particular container by the total weight of solution in that container. Then multiply by 0.2.

This reduction in quantity must not be used to determine the amount present at one-time at a facility for reporting under 40 CFR 370.10.

(c) *Solid in molten form.* Multiply the weight of the non-reactive solid in molten form by 0.3.

This reduction in quantity must not be used to determine the amount present at one-time at a facility for reporting under 40 CFR 370.10.

[73 FR 65462, Nov. 3, 2008, as amended at 77 FR 16688, Mar. 22, 2012]