# Choose credible alternative release scenarios that reach an offsite endpoint > Use 40 CFR 68.28 -- 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/choose-credible-alternative-release-scenarios-that-reach-an-offsite-endpoint/ - Publisher: Detection Systems & Engineering (DSE Security) - Author: DSE Security Editorial Team - Published: 2026-08-27T12:10:16+00:00 - Modified: 2026-08-27T13:12:21+00:00 - Last reviewed by DSE: 2026-08-26 - Resource type: Playbook - DSE priority: Advisory - Topics: Access Control, Business Continuity, Cybersecurity - Reading time: 3 minutes ## What you need to know Use 40 CFR 68.28 -- 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 68.28 -- 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 Keep this document to one review outcome: Choose credible alternative release scenarios that reach an offsite endpoint. Only the official source and traced locations below supply facts. Confirm applicability before acting. ## Source fact: The official [40 CFR 68.28 — Chemical Accident Prevention Provisions](https://www.ecfr.gov/current/title-40/section-68.28) from Environmental Protection Agency via eCFR supports the following bounded statements: - Under 40 CFR 68, the rule requires that for each scenario required under paragraph (a) of this section, the owner or operator select a scenario: that will reach an endpoint offsite, unless no such scenario exists. The research record locates this support at 40 CFR 68.28(b)(1)(ii), read with 40 CFR 68.28(b)(1) (eCFR anchor p-68.28(b)(1)(ii)). - Under 40 CFR 68, the rule requires that the owner or operator identify and analyze at least one alternative release scenario for each regulated toxic substance held in a covered process(es) and at least one alternative release scenario to represent all flammable substances held in covered processes. The research record locates this support at 40 CFR 68.28(a) (eCFR anchor p-68.28(a)). The source support ends with the statements listed above. Use them to examine critical rooms, power, cooling, water, fire protection, alternate sites, physical barriers, and documented recovery paths in the applicable environment, not to imply a wider guarantee. ## 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 68.28(b)(1)(ii), read with 40 CFR 68.28(b)(1) (eCFR anchor p-68.28(b)(1)(ii)), which observable configuration, record, or test can confirm applicability here? - For source statement 2 at 40 CFR 68.28(a) (eCFR anchor p-68.28(a)), 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. Make the source, asset scope, owner, and expected outcome explicit in the review record. 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. Translate the conclusion into change control only after documenting dependencies, impact, test method, expected signals, failure signals, and restoration steps. Include identity and access control, Windows DNS where networked services use it, time, communications, utilities, life-safety systems, vendors, and authorized responders, while excluding secrets and sensitive personal or topology data from ordinary tickets. ## Verification and evidence Build a reproducible chain from 40 CFR 68.28(b)(1)(ii), read with 40 CFR 68.28(b)(1) (eCFR anchor p-68.28(b)(1)(ii)); 40 CFR 68.28(a) (eCFR anchor p-68.28(a)) to the observed environment. Useful domain evidence includes facility inventories, inspection records, alarm and shutdown tests, maintenance history, recovery exercises, and corrective actions; label every item with scope, timestamp, collector, and stable identifier. Close the review only when the evidence, exception handling, resulting action, and after-state are linked. Schedule a new review after material technical, organizational, incident, or source changes; today’s observation is not a continuing guarantee. ## Official references - [40 CFR 68.28 — Chemical Accident Prevention Provisions](https://www.ecfr.gov/current/title-40/section-68.28) — Environmental Protection Agency via eCFR ## Primary reference - Name: 40 CFR 68.28 -- Chemical Accident Prevention Provisions - Authority: www.ecfr.gov - URL: https://www.ecfr.gov/current/title-40/section-68.28 - Source publication date: Not stated by the source ## Citation and use Preferred citation: “Choose credible alternative release scenarios that reach an offsite endpoint,” DSE Security, https://update.dsesecurity.com/updates/choose-credible-alternative-release-scenarios-that-reach-an-offsite-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. 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