Addition of a Subsurface Intrusion Component to the Hazard Ranking System

---
identifier: "/us/fr/2018-01972"
source: "fr"
legal_status: "authoritative_unofficial"
title: "Addition of a Subsurface Intrusion Component to the Hazard Ranking System"
title_number: 0
title_name: "Federal Register"
section_number: "2018-01972"
section_name: "Addition of a Subsurface Intrusion Component to the Hazard Ranking System"
positive_law: false
currency: "2018-01-31"
last_updated: "2018-01-31"
format_version: "1.1.0"
generator: "[email protected]"
agency: "Environmental Protection Agency"
document_number: "2018-01972"
document_type: "rule"
publication_date: "2018-01-31"
agencies:
  - "Environmental Protection Agency"
cfr_references:
  - "40 CFR Part 300"
fr_citation: "83 FR 4430"
fr_volume: 83
---


#  Addition of a Subsurface Intrusion Component to the Hazard Ranking System

**CFR Correction**

In Title 40 of the Code of Federal Regulations, Parts 300 to 399, revised as of July 1, 2017, on page 117, in Appendix A to Part 300, the definition of “source” is reinstated to read as follows:

**Appendix A to Part 300—The Hazard Ranking System**

**1.1 Definitions**

*Source:* Any area where a hazardous substance has been deposited, stored, disposed, or placed, plus those soils that have become contaminated from migration of a hazardous substance. Sources do not include those volumes of air, ground water,  surface water, or surface water sediments that have become contaminated by migration, except: In the case of either a ground water plume with no identified source or contaminated surface water sediments with no identified source, the plume or contaminated sediments may be considered a source.