# NICOR EXPLORATION CO — Warning Letter

**Citation:** CPF 320041010W  
**Type / status:** enforcement / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** Not stated  
**Published:** 2004-10-25

CLOSED warning letter citing 191.5(a).

## Document text

Warning Letter involving NICOR EXPLORATION CO. PHMSA's enforcement data identifies the cited regulation as 191.5(a). The case was opened on 2004-10-25 and is reported as closed as of 2004-10-25. Open the official case record for notices, responses, orders, and the latest status.

PHMSA lists no public case documents for this record.

## Provenance

- Official: Yes
- Source: <https://primis.phmsa.dot.gov/enforcement-data/case/320041010W>
- Source ID: `phmsa-enforcement`
- SHA-256: `27628bb23f1deced365866b957c5850941d1ee7de81c34fe123dd363ab7f9643`
- Retrieved: 2026-08-20T04:44:44.458Z
- Exported: 2026-08-22T23:16:34.336Z
- Document slug: `phmsa-enforcement-320041010w`

### Source metadata

```json
{
  "cpf": "320041010W",
  "operator": "NICOR EXPLORATION CO",
  "region": "Central",
  "pipelineType": "GAS INTERSTATE ONSHORE",
  "caseStatus": "CLOSED",
  "citedSections": [
    "191.5(a)"
  ],
  "dataAsOf": "08/04/2026 12PM",
  "caseDataAsOf": "2026-08-04",
  "attachmentCount": 0,
  "attachments": [],
  "extractedAgencyDocumentCount": 0,
  "attachmentPolicy": "Official attachment links are retained. Agency-issued documents may also include a verified local PDF and page-level text representation.",
  "jurisdiction": "US",
  "operatorName": "NICOR EXPLORATION CO"
}
```