# PHMSA Hazmat Incident I-1999091179 — STYRENE MONOMER, STABILIZED — NEWTON, MA

**Citation:** PHMSA Hazmat Incident I-1999091179  
**Type / status:** incident / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 1999-09-13  
**Published:** Not stated

Serious reporter-submitted hazardous materials transportation incident on 1999-09-13 in NEWTON, MA.

## Document text

PHMSA hazardous materials incident report I-1999091179.
Incident date: 1999-09-13.
Location: NEWTON, MA.
Mode: Highway.
Carrier/reporter: AIRBORNE EXPRESS.
Shipper: ALDRICH CHEMICAL CO INC.
Materials: UN2055; STYRENE MONOMER, STABILIZED; hazard class 3; 0.1875 LGA released.
What failed: Basic Material.
How failed: Cracked.
Reported failure causes: Dropped; Dropped.
Reported result: Spillage, Vapor(Gas) Dispersion.
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: `a4a14e3e667312975badbec7bd6b61f14fb5ee7d513bbdd2a366cbd3c86a663d`
- Retrieved: 2026-08-13T12:55:56.545Z
- Exported: 2026-08-27T01:03:38.773Z
- Document slug: `phmsa-hazmat-incident-i-1999091179`

### Source metadata

```json
{
  "materialSubtype": "phmsa_hazmat_serious_incident",
  "reportNumber": "I-1999091179",
  "operatorReported": true,
  "serious": true,
  "finalAgencyFinding": false,
  "eventDescriptionExcluded": true,
  "publicPdfUrl": null,
  "rowCount": 1,
  "carrierReporterNames": [
    "AIRBORNE EXPRESS"
  ],
  "shipperNames": [
    "ALDRICH CHEMICAL CO INC"
  ],
  "routes": [
    "159 WELLS AVE"
  ],
  "cities": [
    "NEWTON"
  ],
  "states": [
    "MA"
  ],
  "originCities": [],
  "modes": [
    "Highway"
  ],
  "materials": [
    {
      "identificationNumber": "UN2055",
      "commodityName": "STYRENE MONOMER, STABILIZED",
      "hazardousClass": "3",
      "quantityReleased": "0.1875",
      "unitOfMeasure": "LGA"
    }
  ],
  "packages": [
    {
      "identificationMarkings": null,
      "outerMaterial": null,
      "outerType": null,
      "outerCapacity": "2.38",
      "outerCapacityUnit": "LGA",
      "outerShipmentCount": "1",
      "outerFailedCount": "1",
      "innerMaterial": null,
      "innerType": null,
      "innerCapacity": "0.66043",
      "innerCapacityUnit": "LGA",
      "innerShipmentCount": "1",
      "innerFailedCount": "1"
    }
  ],
  "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"
}
```