# HQ US Army Joint Munitions Command 1 — Hazardous Materials Safety Interpretation **Citation:** 03-0126 **Type / status:** guidance / guidance **Agency:** Pipeline and Hazardous Materials Safety Administration **Effective:** Not stated **Published:** 2003-06-06 03-0126 response to HQ US Army Joint Munitions Command 1 concerning 174.81. ## Document text <<>> - of Transportation U.S. Department JUN 6 2003 Vashington, D.C. 2059 00 Seventh St., S.V Research and Special Programs Administration Mr. Kelly W. Crooks Ref. No: 03-0126 Acting Chief, Safety/Rad Waste Office HQ US Army Joint Munitions Command 1 Rock Island Arsenal Rock Island, IL 61299-6000 Dear Mr. Crooks: This is in response to your May 7, 2003 letter requesting clarification of the requirements in the lazardous Materials Regulations (HMR; 49 CFR Parts 172-180) regarding the loading, transpor ind incidental storage of a 1.4G (explosive) material, other than fireworks, with other Class (explosive) material, other than detonators, in compatibility groups C, D, E, or S by rail, vessel and highway. Your questions are paraphrased and answered below. Q1. Can a 1.4G (explosive) material be transported by rail with other Class 1 (explosive) material in compatibility groups C, D, E, or S? Al. The answer is yes, with the following limitations: • When the § 172.101 table or § 172.402 requires a package to bear a subsidiary hazard label, segregation appropriate to the subsidiary hazard must be applied when that segregation is more restrictive than that required by the primary hazard. However, hazardous materials of the same class may be loaded and transported together without regard to segregation required by any secondary hazard if the materials are not capable of reacting dangerously with each other and causing combustion or dangerous evolution of heat, evolution of flammable, poisonous, or asphyxiant gases, or formation of corrosive or unstable materials. (§ 174.81(e)(6)). Explosive articles in compatibility group G, other than fireworks and those requiring special stowage, may be loaded and transported with articles of compatibility groups C, D, E, provided no explosive substances are carried in the same rail car. (§ 174.81(g)(3)(vi)). Q2. Can a 1.4G (explosive) material be transported by vessel with other Class 1 (explosive) material in compatibility groups C, D, E, or S? A2. The answer is yes, with the following limitations: Explosive articles in compatibility group G, other than fireworks and those equiring special stowage, may be stowed with articles of compatibility groups C ), and E, provided no explosive substances are carried in the same compartmen portable magazine or transport unit. (Table 176.144(a), Note 1) 174.81 030126 <<>> • Q3. Can a 1.4G (explosive) material be transported by public highway with other Class 1 (explosive) material in compatibility groups C, D, E, or S? The answer is yes, with the following limitations: When the § 172.101 table or § 172.402 of this subchapter requires a package to bear a subsidiary hazard label, segregation appropriate to the subsidiary hazard must be applied when that segregation is more restrictive than that required by the primary hazard. However, hazardous materials of the same class may be loaded and transported together without regard to segregation required by any secondary hazard if the materials are not capable of reacting dangerously with each other and causing combustion or dangerous evolution of heat, evolution of flammable, poisonous, or asphyxiant gases, or formation of corrosive or unstable materials. (§ 177.848(e)(6)) • Explosive articles in compatibility group G, other than fireworks and those requiring special handling, may be loaded, transported and stored with other explosive articles of compatibility groups C, D, and E, provided that explosive substances (such as those not contained in articles) are not carried in the same vehicle. (§ 177.848(g)(3) (vi)) • See § 177.835(g) pertaining to detonators. (§ 177.848(g)(iv)) 04. Is it the shipper's responsibility to determine whether a risk of "dangerous reaction" between materials exist, and is the shipper required to document that decision in writing? A4. The answer is yes. Section 173.24(e)(4) states ..."hazardous materials may not be packed or mixed together in the same outer packaging with other hazardous or non-hazardous materials if such materials are capable of reacting dangerously with each other and causing: combustion or dangerous evolution of heat; evolution of flammable, poisonous, or asphyxiant gases; or formation of unstable or corrosive materials." Also see § 173.21(e). It is the shipper's responsibility to determine whether any of these dangerous reactions can occur. Such determinations are not required to be verified by or submitted to this Office. I hope this satisfies your request. Sincerely, Hathe s. mithell Hattie L. Mitchell, Chief Regulatory Review and Reinvention Office of Hazardous Materials Standards <<>> Betts HEADQUARTERS, U.S. ARMY JOINT MUNITIONS COMMAND § 174.81 DEPARTMENT OF THE ARMY ROCK ISLAND, IL 61299-6000 1 ROCK ISLAND ARSENAL 3176.83 ATTENTION OF: REPLY TO May ?, 2003 §177.848 Safety/Rad Waste Office Segregation 03-8126 Office of Hazardous Materials Standards, Research and Special Programs Administration, Attention: DHM-10 US Department of Transportation 400 7t Street sw Washington, DC 20590-0001 Dear Six/Madam: Reference 49 Code of Federal Regulation, parts 100 to 185: (g) , and (h) : a. Part 174 - Carriage by Rail - 174.81(e) (6) and 174.81 (f), b. Part 176 - Carriage by Vessel - 176.83 (a) (8) and (10) (f), and (g) c. Part 177 - Carriage by Public Highway - 77.848 (e) (6), This is a formal followup to electronic mail exchange earlier in April via your website. response to appropriate Department of Defense shippers and our intent is to distribute your disputes. transportation regulating agencies, to help prevent future Request interpretation on the practice of shipping hazard class/division and compatibility group 1.4G material (except fireworks) with other class 1 material in compatibility groups C, or s (except detônatora.) This practice was questioned When the Material also had a subsidiary hazard(a) present. our understanding of references is that they do allow storage and transport of class 1 material, compatibility codes C, D, E, conditions: G, and S, with or without subsidiary hazards, under the following ... Printed On Bes Recycled Paper ... :: . <<>> - 2- code G material is not 'fireworks'; i.e., the term require special handling; 'fireworks' 1s not part of the proper shipping name, and does not 'detonators' is not part of the proper shipping name; and Code 5 material is not a detonator; i.e., the term defined in reference. Substances do not pose a risk of 'dangerous reaction' as - Please advise if our understanding of the above references is is the shipper's responsibility to determine if a risk of correct. We would also appreciate your interpretation whether it 'dangerous reaction' between materials exists, and if we must shipments. document that decision in writing and accompany affected Thank you in advance for your assistance. we are providing a copy of this letter to: Attention: a. US Army Technical Center for Explosives Safety, 74501-9053 SOSAS-ESL, 1 C Iree Road, McAlester, Oklahoma b. US Army Military Traffic Management Command, Attention: MTOP-DE-I (LTCDR Pugh), Ft. Eustis, Virginia 23604 Eisenhower Avenue, Alexandria, Virginia 22333-0001 c. US Army Materiel Command, Attention: AMCPE-SF, 5001 Safety/Rad Waste Office (AMSJM-SF), telephone (309) 782-2971, The point of contact for this request is Mr. Tim Gallagher, electronic mail JMC-OFC-SF@osc.army.m11. Sincerely, Kelly W. Crooks Acting Chief, safety/ Rad Waste Office ## Provenance - Official: Yes - Source: - Source ID: `phmsa` - SHA-256: `e30f0ad39c3e36c78cc46a2cf3c41de59a5c0a0e993ee09020cc9a1f3233ae19` - Retrieved: 2026-08-20T00:59:31.977Z - Exported: 2026-08-22T21:23:14.503Z - Document slug: `phmsa-interpretation-03-0126` ### Source metadata ```json { "materialSubtype": "interpretation", "interpretationArea": "hazardous_materials", "representation": "full_text_from_official_pdf", "companies": [ "HQ US Army Joint Munitions Command 1" ], "individuals": [ "Mr. Kelly W. 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