# PHMSA Hazmat Incident I-2007010046 — SODIUM HYDROXIDE, SOLUTION — NAMPA, ID

**Citation:** PHMSA Hazmat Incident I-2007010046  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2006-11-07  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 2006-11-07 in NAMPA, ID.

## Document text

PHMSA hazardous materials incident report I-2007010046.
Incident date: 2006-11-07.
Location: NAMPA, ID.
Mode: Rail.
Carrier/reporter: UNION PACIFIC RAILROAD.
Shipper: PIONEER AMERICAS.
Materials: UN1824; SODIUM HYDROXIDE, SOLUTION; hazard class 8; 10 LGA released | UN1824; SODIUM HYDROXIDE, SOLUTION; hazard class 8; 1000 LGA released.
What failed: Frangible Disc; Pressure Relief Valve or Device - Non-Reclosing.
How failed: Leaked.
Reported failure causes: 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: `7b3b64bacfc3b73824f32d86e583292e7e9f6d57df0492e861708d68ed9188de`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-23T09:59:02.926Z
- Document slug: `phmsa-hazmat-incident-i-2007010046`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "I-2007010046",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": null,
  "rowCount": 2,
  "carrierReporterNames": [
    "UNION PACIFIC RAILROAD"
  ],
  "shipperNames": [
    "PIONEER AMERICAS"
  ],
  "routes": [
    "MILEPOST: 456.84"
  ],
  "cities": [
    "NAMPA"
  ],
  "states": [
    "ID"
  ],
  "originCities": [
    "GREEN RIVER"
  ],
  "modes": [
    "Rail"
  ],
  "materials": [
    {
      "identificationNumber": "UN1824",
      "commodityName": "SODIUM HYDROXIDE, SOLUTION",
      "hazardousClass": "8",
      "quantityReleased": "10",
      "unitOfMeasure": "LGA"
    },
    {
      "identificationNumber": "UN1824",
      "commodityName": "SODIUM HYDROXIDE, SOLUTION",
      "hazardousClass": "8",
      "quantityReleased": "1000",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
    {
      "identificationMarkings": "DOT 111A100W1",
      "outerMaterial": "CARBON STEEL",
      "outerType": null,
      "outerCapacity": "16602",
      "outerCapacityUnit": "LGA",
      "outerShipmentCount": "1",
      "outerFailedCount": "1",
      "innerMaterial": null,
      "innerType": null,
      "innerCapacity": "0",
      "innerCapacityUnit": null,
      "innerShipmentCount": "0",
      "innerFailedCount": "0"
    },
    {
      "identificationMarkings": "DOT111A100W1",
      "outerMaterial": "CARBON STEEL",
      "outerType": null,
      "outerCapacity": "16631",
      "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"
}
```