# Identify environmental receptors within the modeled accidental-release endpoint > Use 40 CFR 68.33 -- Chemical Accident Prevention Provisions to review this narrow operational decision without extending the source beyond its stated scope. - Canonical URL: https://update.dsesecurity.com/updates/identify-environmental-receptors-within-the-modeled-accidental-release-endpoint/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T12:10:14+00:00 - Modified: 2026-08-27T13:12:21+00:00 - Last reviewed by DSE: 2026-08-26 - Resource type: Checklist - DSE priority: Advisory - Topics: Access Control, Business Continuity, Cybersecurity - Reading time: 3 minutes ## What you need to know Use 40 CFR 68.33 -- Chemical Accident Prevention Provisions to review this narrow operational decision without extending the source beyond its stated scope. ## Potentially affected Teams, systems, services, or facilities within the stated scope of 40 CFR 68.33 -- Chemical Accident Prevention Provisions ## DSE recommendation Compare the observed state with the cited official source, document applicability and exceptions, and test any approved change with rollback safeguards. ## Article Treat this document as a focused evidence review: Identify environmental receptors within the modeled accidental-release endpoint. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [40 CFR 68.33 — Chemical Accident Prevention Provisions](https://www.ecfr.gov/current/title-40/section-68.33) from Environmental Protection Agency via eCFR supports the following bounded statements: - Under 40 CFR 68, the rule requires that the owner or operator list in the RMP environmental receptors within a circle with its center at the point of the release and a radius determined by the distance to the endpoint defined in section 68.22(a) of this part. The research record locates this support at 40 CFR 68.33(a) (eCFR anchor p-68.33(a)). - Under 40 CFR 68, the owner or operator may rely on information provided on local U.S. Geological Survey maps or on any data source containing U.S.G.S. data to identify environmental receptors. The research record locates this support at 40 CFR 68.33(b) (eCFR anchor p-68.33(b)). Do not import neighboring assumptions into the source record. The supported task is a scoped comparison involving critical rooms, power, cooling, water, fire protection, alternate sites, physical barriers, and documented recovery paths and the conditions the source actually describes. ## What the source does not establish Applies only to stationary sources and processes subject to 40 CFR part 68 and the applicable program level. Confirm coverage, regulated substances, process conditions, and current EPA requirements; this is not legal advice or a universal emergency-management standard. Do not read the source as proof of implementation or permission to change production. Its guidance remains conditional on identity and access control, Windows DNS where networked services use it, time, communications, utilities, life-safety systems, vendors, and authorized responders and the environment’s recorded constraints. ## Applicability questions - For source statement 1 at 40 CFR 68.33(a) (eCFR anchor p-68.33(a)), which observable configuration, record, or test can confirm applicability here? - For source statement 2 at 40 CFR 68.33(b) (eCFR anchor p-68.33(b)), which observable configuration, record, or test can confirm applicability here? - Which owner can attest to the recorded state of critical rooms, power, cooling, water, fire protection, alternate sites, physical barriers, and documented recovery paths, including exceptions? - What baseline for identity and access control, Windows DNS where networked services use it, time, communications, utilities, life-safety systems, vendors, and authorized responders must accompany the source-specific observation? - Which success, stop, and escalation criteria are written before testing begins? ## DSE recommendation: DSE recommends using the cited source as the evidence anchor for this decision. Use a two-person review for the source interpretation and the resulting operational decision. Record the source location, examined part of critical rooms, power, cooling, water, fire protection, alternate sites, physical barriers, and documented recovery paths, observed and expected states, owner, and reason for deviation. Do not move from citation to production in one step. Pilot the decision where practical, observe agreed signals, retain a reversal point, and verify identity and access control, Windows DNS where networked services use it, time, communications, utilities, life-safety systems, vendors, and authorized responders. Handle credentials, keys, recovery data, and personal information through approved secure channels. ## Verification and evidence Keep the source locations 40 CFR 68.33(a) (eCFR anchor p-68.33(a)); 40 CFR 68.33(b) (eCFR anchor p-68.33(b)) adjacent to the sanitized artifacts used for comparison. Prefer facility inventories, inspection records, alarm and shutdown tests, maintenance history, recovery exercises, and corrective actions, with enough identity and timing data for an independent recheck. Retain the starting state, authorization, execution record, outcome, deviation, and final state as one review package. Move disruptive checks to an approved test path. Reopen the decision when versions, design, dependencies, ownership, or official guidance changes. ## Official references - [40 CFR 68.33 — Chemical Accident Prevention Provisions](https://www.ecfr.gov/current/title-40/section-68.33) — Environmental Protection Agency via eCFR ## Primary reference - Name: 40 CFR 68.33 -- Chemical Accident Prevention Provisions - Authority: www.ecfr.gov - URL: https://www.ecfr.gov/current/title-40/section-68.33 - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Identify environmental receptors within the modeled accidental-release endpoint,” DSE Security, https://update.dsesecurity.com/updates/identify-environmental-receptors-within-the-modeled-accidental-release-endpoint/ Publishing principles: https://update.dsesecurity.com/updates/dse-updates-editorial-methodology/ Usage and citation policy: https://update.dsesecurity.com/usage/ Copyright © 2026 Detection Systems & Engineering. All rights reserved.