# PHMSA Hazmat Incident I-2006080308 — PHOSPHORIC ACID SOLUTION — MASON CITY, IA

**Citation:** PHMSA Hazmat Incident I-2006080308  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2006-07-23  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 2006-07-23 in MASON CITY, IA.

## Document text

PHMSA hazardous materials incident report I-2006080308.
Incident date: 2006-07-23.
Location: MASON CITY, IA.
Mode: Rail.
Carrier/reporter: UNION PACIFIC RAILROAD.
Shipper: PCS PHOSPHATES.
Materials: UN1805; PHOSPHORIC ACID SOLUTION; hazard class 8; 1 LGA released.
What failed: Frangible Disc; Pressure Relief Valve or Device - Non-Reclosing.
How failed: Leaked; Leaked.
Reported failure causes: Over-pressurized; Over-pressurized.
Reported result: Spillage.
Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.

## Provenance

- Official: Yes
- Source: <https://portalpublic.phmsa.dot.gov/analytics/saw.dll?Portal?PortalPath=/shared/Public%20Website%20Pages/_portal/Hazmat%20Incident%20Report%20Search>
- Source ID: `phmsa-hazmat-incidents`
- SHA-256: `f90431b5158c7bace023d794519e8c0982c32f7a0009982018d7bd698b6d8f3c`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-27T03:26:22.072Z
- Document slug: `phmsa-hazmat-incident-i-2006080308`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "I-2006080308",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": null,
  "rowCount": 1,
  "carrierReporterNames": [
    "UNION PACIFIC RAILROAD"
  ],
  "shipperNames": [
    "PCS PHOSPHATES"
  ],
  "routes": [
    "MILEPOST: 193.10"
  ],
  "cities": [
    "MASON CITY"
  ],
  "states": [
    "IA"
  ],
  "originCities": [
    "WHITE SPRINGS"
  ],
  "modes": [
    "Rail"
  ],
  "materials": [
    {
      "identificationNumber": "UN1805",
      "commodityName": "PHOSPHORIC ACID SOLUTION",
      "hazardousClass": "8",
      "quantityReleased": "1",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
    {
      "identificationMarkings": "DOT 111A100W1",
      "outerMaterial": "ALLOY STEEL",
      "outerType": null,
      "outerCapacity": "12968",
      "outerCapacityUnit": "LGA",
      "outerShipmentCount": "1",
      "outerFailedCount": "1",
      "innerMaterial": null,
      "innerType": null,
      "innerCapacity": "0",
      "innerCapacityUnit": null,
      "innerShipmentCount": "0",
      "innerFailedCount": "0"
    }
  ],
  "reportingRuleContext": [
    "171.15",
    "171.16"
  ],
  "caveat": "Reporter-submitted DOT Form 5800.1 data may be incomplete, corrected, supplemented, or misreported. A record, serious-incident classification, failure description, or relationship to a reporting rule is not a PHMSA causal finding, compliance determination, or finding of a violation.",
  "privacyCaveat": "The public CSV excludes preparer contact fields. Event Description is intentionally excluded from normalized records and search output to reduce incidental personal-information risk.",
  "jurisdiction": "US"
}
```