# Poitevent Carrère & Denègre L.L.P. — Hazardous Materials Safety Interpretation **Citation:** 99-0269 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 1999-12-02 99-0269 response to Poitevent Carrère & Denègre L.L.P. concerning 171.8. ## Document text <<>> U.S. Department of Transportation 400 Seventh Street, S.W. Washington, D.C. Special Programs Research and Administration DEC 2 1999 Mr. Stanley A. Millan Jones Walker Waechter Ref. No. 99-0269 Poitevent Carrère & Denègre I.L.P. 201 St. Charles Avenue New Orleans, LA 70170-5100 Dear Mr. Millan: This is response to your letter dated October 1, 1999, concerning the definition of hazardous substance under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Under $ 171.8, a hazardous substance is defined including its mixtures and solutions, that: (1) is listed in as a material, Appendix A to § 172.101 of the HMR; (2) is in a quantity, in one is in a package, which equals or exceeds its reportable quantity; and (3) concentration by weight which equals or exceeds the in the table under S 171.8. concentration corresponding to the RQ of the material, as shown For example, n-Butyl phthalate has an RQ of 10 pounds. To meet the definition of a hazardous substance, the quantity of n-Butyl concentration by weight must be equal to or be greater than 0.02% phthalate in each package must equal or exceed 10 pounds, and the (200 ppm) .. I hope this satisfies your request. Sincerely, Transportation Regulations Specialist Office of Hazardous Materials Standards 990269 <<>> JONES WALKER WAECHTER POITEVENT BAH CARRÈRE & DENÈGRE L.L.P. 81718 Harsok STANLEY A. MILLAN 201 ST. CHARLES AVENUE FAX 504-582-8583 504-582-8328 NEW ORLEANS, LOUISIANA 70170-5100 smillan@jwlaw.com October 1, 1999 99-0269 BY FAX (202) 366-3012 Director, Office of Hazardous Materials Standards Mr. Edward Mazzulo U.S. DOT/RSPA (DHM 10) 400 Seventh Street, S.W. Washington, D.C. 20590-0001 Re: Hazardous Substances Dear Mr. Mazzulo: I request any interpretative guidance you have on the definition of hazardous substances at 49 C.F.R. 171.8 with respect to solutions and the conjunctive (i.e., and) test that a hazardous substance is (1) a listed substance, (2) in a designated quantity, and (3) in a certain solution concentration. Thank you for your consideration. Tot Millan Stanley A. Milíar SAM/ksc BATON ROUGE OFFICE: FOUR UNITED PLAZA • 8555 UNITED PLAZA BOULEVARD • BATON ROUGE, LOUISIANA 70809-7000 • 225-231-2000 • FAX 225-231-2010 WASHINGTON, D.C. OFFICE: SUITE 600, 499 SOUTH CAPITOL STREET, S.WV. • WASHINGTON, D. C. 20003 • 202-828-8363 • FAX 202-828-6907 LAFAYETTE OFFICE: SUITE 120 • 500 DOVER BOULEVARD • LAFAYETTE, LOUISIANA 70503 • 318-406-5610 • FAX 318-406-5620 N0415661.1 ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `a04c85b8f2928905d20f36704cb4859586938527bb82024429ccdfb26cf410c7` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T04:05:14.197Z - Document slug: `phmsa-interpretation-99-0269` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "Poitevent Carrère & Denègre L.L.P." ], "individuals": [ "Mr. Stanley A. Millan" ], "refIds": [ "99-0269" ], "catalogDates": [ "1999-12-02" ], "catalogParts": [ 171 ], "catalogRowCount": 1, "sourceRecordUrls": [ "https://www.phmsa.dot.gov/node/61551" ], "linkedAttachmentUrls": [], "unavailableResponseUrls": [], "duplicateRepresentationUrls": [], "citedSections": [ "171.8", "172.101" ], "catalogPageUrls": [ "https://www.phmsa.dot.gov/regulations/title49/section/1718" ], "pdfUrls": [ "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1999/990269.pdf" ], "representations": [ { "viewUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1999/990269.pdf", "detailUrl": null, "detailHtmlPath": null, "pdfUrl": "https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/1999/990269.pdf", "pdfArtifactPath": "data/sources/phmsa-interpretations/99-0269-cd4fb84462.pdf", "pdfArtifactSha256": "5d93bfe6a1e475a39608b08a0c57fecce6bcb2413d9c473e8023787d1323e29a", "extractedTextPath": "data/sources/phmsa-interpretations/99-0269-cd4fb84462.v2.txt", "extractedTextSha256": "8893c4e3e9df8825a1b310fae609ef9891b9f1ea4eba101dd94914b8c76ccc69", "pageCount": 2, "extractionVersion": 2 } ], "caveat": "Interpretations apply regulations to the facts presented and do not create independently enforceable requirements.", "jurisdiction": "US" } ```