# PHMSA Hazmat Incident X-2009050373 — FLUOROSILICIC ACID — ROSEVILLE, CA

**Citation:** PHMSA Hazmat Incident X-2009050373  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2009-04-21  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 2009-04-21 in ROSEVILLE, CA.

## Document text

PHMSA hazardous materials incident report X-2009050373.
Incident date: 2009-04-21.
Location: ROSEVILLE, CA.
Mode: Rail.
Carrier/reporter: Union Pacific Railroad.
Shipper: Simplot Phosphates.
Materials: UN1778; FLUOROSILICIC ACID; hazard class 8; 0.0625 LGA released.
What failed: Flange.
How failed: Leaked.
Reported failure causes: Missing Component or Device.
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://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=12psoTpwfY%2FY3YfZLLvF4A%3D%3D>
- Source ID: `phmsa-hazmat-incidents`
- SHA-256: `6a65b6d7e55c5735b44f794fe3e0540a0cd6abf1db18d4ea2b0dbe04852de3b1`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-24T00:49:41.605Z
- Document slug: `phmsa-hazmat-incident-x-2009050373`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "X-2009050373",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": "https://portal.phmsa.dot.gov/PDFGenerator/getPublicReport/OHMIR_5800-1-PUBLIC?INCIDENTID=12psoTpwfY%2FY3YfZLLvF4A%3D%3D",
  "rowCount": 1,
  "carrierReporterNames": [
    "Union Pacific Railroad"
  ],
  "shipperNames": [
    "Simplot Phosphates"
  ],
  "routes": [],
  "cities": [
    "ROSEVILLE"
  ],
  "states": [
    "CA"
  ],
  "originCities": [
    "ROCK SPRINGS"
  ],
  "modes": [
    "Rail"
  ],
  "materials": [
    {
      "identificationNumber": "UN1778",
      "commodityName": "FLUOROSILICIC ACID",
      "hazardousClass": "8",
      "quantityReleased": "0.0625",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
    {
      "identificationMarkings": "111A",
      "outerMaterial": "ASTM A516, Gr. 70",
      "outerType": null,
      "outerCapacity": "25587.5",
      "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"
}
```