# Mr. Christian W. Solum — Hazardous Materials Safety Interpretation

**Citation:** 06-0033  
**Type / status:** guidance / guidance  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2006-03-01

06-0033 concerning 173.140.

## Document text

<<<PAGE 1>>>

S. Departme
Transportatio
400 Seventh Street, S.W.
Washington, D.C. 20590
Pipeline and
Administration
Hazarcious Materials Safety
MAR
2009
Mr. Christian W. Solum
Ref. No. 06-0033
Building 704-3N, Rm S111D
Aiken, SC 29808
Dear Mr. Solum:
This is in response to your February 6, 2006 letter requesting clarification of the
Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically, you ask if
a limited quantity Class 7 (Radioactive) material could also meet the definition of a Class
9 (Miscellaneous) material in accordance with the HMR.
The answer is no. For the purposes of the HMR, a Class 9 material is defined as "a
material which presents a hazard during transportation but which does not meet the
definition of any other hazard class." See § 173.140. The material in question does not
meet the definition of a Class 9 material because it meets the definition of another hazard
class.
I hope this information is helpful.
Sincerely,
Loma tro
(Chief, Standards Development
Office of Hazardous Materials Standards
173.140
060033

<<<PAGE 2>>>

SRS
SAVANNAH RIVER SITE
Aiken, SC: 29808 • www.srs.gov
Eichenlaud
February 6, 2006
$173.140
Office of Hazardous Materials Standards
Definition
Pipeline and Hazardous Materials Safety Administration
Attn: PHH-10,
06-0033
U.S. Department Of Transportation
Washington Sc
DC 20590-0001
LIMITED QUANTITY CLASS 7 INTERPRETATION REQUEST
It is the position of Washington Savannah River Company (WSRC) that Class 9 materials
described in 173.140 shall not meet the definition of any other hazard class and must not be
represented as having a subsidiary hazard of any other hazard class. Specifically in question
is a material meeting the definition of a limited quantity Class 7. If a material meets the
definition of a limited quantity Class 7 material, it cannot meet the definition of a Class 9
material. WSRC hereby respectfully request a formal interpretation regarding its position.
Respectfully,
Christian Vi. Solum:
Christian W. Solum, Hazardous Material Shipping Advisor
Washington Savannah River Company
Building 704-3N, Rm S111D
Aiken, SC 29808
1-803-557-4689
Christian.solum@srs.gov
WASHINGTON SAVANNAH RIVER COMPANY
Corporation By Swaman Suer Company a CHL Servana River Company River. C. • NG Amarica Sawana fiver

## Provenance

- Official: Yes
- Source: <https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/legacy/interpretations/Interpretation%20Files/2006/060033.pdf>
- Source ID: `phmsa`
- SHA-256: `d40616162169104632535b564c5dca390a1d54cb41992853c0723fd475eba6e1`
- Retrieved: 2026-08-20T00:59:31.977Z
- Exported: 2026-08-23T05:47:42.525Z
- Document slug: `phmsa-interpretation-06-0033`

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