# 255.757 Replacement of cast iron mains paralleling excavations.

**Citation:** 16 NYCRR 255.757  
**Type / status:** regulation / current  
**Agency:** New York State Public Service Commission  
**Effective:** Not stated  
**Published:** Not stated

Transmission and Distribution of Gas. (a) If an excavation is made parallel to any cast iron gas main, eight inches or less in nominal diameter, and said excavation is not adequately shored to protect the cast iron main against movement, the cast iron main must be replaced where more than half the pipe diameter lies above a line projected at an angle above the horizontal equal to the angle of re

## Document text

(a) If an excavation is made parallel to any cast iron gas main, eight inches or less in nominal diameter, and said excavation is not adequately shored to protect the cast iron main against movement, the cast iron main must be replaced where more than half the pipe diameter lies above a line projected at an angle above the horizontal equal to the angle of repose for the soil conditions being encountered, starting from the bottom of the excavation at the side nearest the main.

(b) Replacement is to be completed prior to the third-party construction activity, if possible. Otherwise, replacement is to commence immediately after the contractor allows access to the excavation area for replacement and the area is to be maintained under daily leakage survey until replacement is complete.

## Provenance

- Official: Yes
- Source: <https://govt.westlaw.com/nycrr/Document/I505d816bcd1711dda432a117e6e0f345?viewType=FullText&originationContext=documenttoc&transitionType=CategoryPageItem&contextData=(sc.Default)>
- Source ID: `ny-dps-nycrr`
- SHA-256: `9c0343e81961107a459e92086df7a1ee4bca41f99c061c4dde51f317e92802c1`
- Retrieved: 2026-08-12T06:20:40.894Z
- Exported: 2026-08-22T12:25:18.280Z
- Document slug: `ny-nycrr-255-757`

### Source metadata

```json
{
  "jurisdiction": "US-NY",
  "title": 16,
  "part": "255",
  "partTitle": "Transmission and Distribution of Gas",
  "scopeKind": "gas-pipeline-safety",
  "tocPath": [
    "Part 255 Transmission and Distribution of Gas",
    "Maintenance"
  ],
  "legalScope": "Complete current terminal legal unit exposed by the DPS-designated Title 16 NYCRR pipeline-safety part inventory.",
  "applicabilityCaveat": "Applicability depends on the part and section, Commission jurisdiction, commodity and facility type, intrastate or interstate status, operator and activity, exemptions, waivers, federal preemption, Commission orders, and incorporated law. DPS inspects portions of interstate systems for PHMSA, but PHMSA retains federal enforcement authority. DPS states that all jurisdictional Part 256 gas-holder and Part 257 LPG-plant facilities have been decommissioned even though those regulations remain unrepealed.",
  "incorporationCaveat": "These parts incorporate or rely on federal pipeline regulations, federal and New York statutes, Commission rules and orders, and privately authored technical standards. Part 10 supplies incorporation details. References metadata preserves explicit citations but does not reproduce external material, determine licensing rights, or decide whether a particular incorporation is static or dynamic.",
  "publicationCaveat": "The New York Department of Public Service identifies these eleven Title 16 NYCRR parts as its state pipeline-safety regulations and links to the public DOS/Westlaw NYCRR reading copy. That site labels the online text unofficial and directs users needing evidentiary accuracy to the Official NYCRR maintained by the Department of State Division of Administrative Rules. Each section's 'Current through' date is the most recent official NYCRR supplement covering that section, not a uniform corpus-wide amendment date.",
  "rights": "New York government-edict text is preserved with DPS, Department of State, and publisher attribution. The public reading site's presentation and enhancements, agency marks, forms, annotations, and incorporated federal or privately authored standards require separate rights review; this connector does not claim rights in those materials.",
  "rightsReviewRequired": true,
  "currentThrough": "2024-05-31",
  "historyEvents": "No event is emitted because the section reading copy does not supply an explicit adoption, filing, or effective-date history.",
  "publisherCitation": "16 CRR-NY 255.757",
  "identityAnomaly": null,
  "references": [],
  "region": "NY"
}
```