Connecticut_Natural_Gas_Requirements.pdf

APPENDIX

CNG CORP. GENERAL POLICIES FOR WORK NEAR GAS

FACILITIES

Appendix B – Subpart VIII

Protection & Replacement of

Exposed Gas Facilities

Connecticut Natural Gas Southern Connecticut Gas

Maintenance of this SOP is the responsibility of Gas System Planning & Technical Services

Revision Description Name Signature Date

1.0

Unified

O&M

Authored Gas Technical Services TL, OM Dec 9, 2020

Reviewed Standards Committee TL, OM Jan 29, 2021

Approved Manager, Gas Planning

& Technical Services KG Feb 2, 2021

CONNECTICUT NATURAL GAS

THE SOUTHERN CONNECTICUT GAS COMPANY

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B99

PURPOSE

This procedure establishes the CNG/SCG policy for the protection/replacement of gas facilities when exposed.

The practice of CNG/SCG is to adhere to the prescriptions of appropriate sections of Title 49 of the Code of Federal Regulations, Part 192.614. Any contractor, utility company crew, builder, or excavator must adhere to the regulations.

PROCEDURE

I. Definitions

The following definitions apply to this memorandum:

A. Excavation - An operation for the purpose of movement or removal of earth, rock, or other materials in or on the ground, or otherwise disturbing the subsurface of the earth, by the use of powered or mechanized equipment. This includes, but is not limited to, digging, pile driving, auguring, backfilling, test boring, drilling, grading, plowing-in, hammering, pulling-in, trenching, and tunneling.

B. Damage - Includes, but is not limited to, the weakening of structure or support, penetration or destruction of the protective coating, housing, or the severance, partial or complete, of gas facilities.

C. Gas Facility - All physical facilities which house or move gas for transportation and distribution including pipe, valves, and other appurtenances attached to the pipe.

II. Notification

A. A copy of this procedure is given to all agencies requesting review of their proposed construction designs.

B. Upon receipt of outside agencies’ plans, maps, and correspondence, Distribution

Engineering reviews the project relative to CNG/SCG’s facilities and responds to the requesting party.

C. The excavator notifies “Call Before You Dig” (CBYD) as prescribed by

Connecticut State Law, Section 16-345 of Public Act 87-71.

D. Once excavation is started, the Construction Site Supervisors or their designees are responsible for visiting the excavation site as outlined in Appendix B, Subpart

VI - “Monitoring of Gas Facilities”.

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B100

III. Guidelines

A. General

1. The support for the gas facility either by strapping (see Exhibits I and

III) or wooden vertical supports (see Exhibit II) is installed in a manner that the pipe does not move when the soil is removed from under the pipe and that undue stress is not imposed at fittings, valves, and other accessories on the pipe.

2. Trench shoring practices are not affected by the requirements outlined in this procedure.

3. An excavator is responsible for any damages that he/she inflicts upon

CNG/SCG’s facilities.

4. If the excavator/contractor is to be billed for damages or a replacement, the Distribution Supervisor or their designee documents, takes photographs of the affected facility, and immediately sends a letter

(Exhibit IV) to the excavator/contractor stating that a bill will be forthcoming.

5. Any conflicts between CNG/SCG or the excavator/contractor regarding the billing for repair of the damage or the possible replacement are resolved by the Manager of Construction & Maintenance.

B. Crossings

1. Temporary Support – Cast Iron, Steel, Plastic

a. Exhibit I is a drawing which depicts a temporary support for a gas main that crosses a trench at any angle with an exposed pipe length of greater than six feet for cast iron or ten feet for plastic or steel (see 2b below).

2. Permanent Support – Cast Iron

a. When cast iron pipe crossing exposure is six feet or less in length, one permanent pipe support is required (see Exhibit II).

b. When cast iron pipe is six inches or less in diameter and crossing exceeds six feet in length, the pipe is replaced. When this condition exists, the replacement consists of the length of exposure plus a minimum of four feet measured perpendicular from the trench wall to the pipe. The removal and replacement expense is borne by the excavator/contractor.

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B101

c. When cast iron pipe is greater than six inches in diameter and is crossed and exceeds six feet in length, two or more permanent pipe supports are required.

d. When cast iron pipe is greater than six inches in diameter and is crossed and the exposure exceeds 12 feet in length, it is considered for possible replacement depending on site conditions.

3. Temporary Support – Cast Iron, Steel, Plastic

a. A firm foundation of properly compacted backfill is the only permanent support required for plastic or steel pipe.

C. Parallel Excavation

1. Temporary Support – Cast Iron, Steel, Plastic

a. The Exhibit III drawing depicts a type of temporary support for a gas main that is exposed or undermined by a parallel excavation.

b. The policy of CNG/SCG is to replace the cast iron pipe at the excavator’s/contractor’s expense.

1) If the relocation is not possible at the start of the project, temporary supporting may be permitted by CNG/SCG after consideration is given to the type of pipe, length of exposed pipe, service lines, and other pertinent facts.

2) When temporary support is allowed, it should be done in a manner similar to Exhibit III. After the completion of the project, the replacement of a facility is scheduled to be replaced in accordance with Appendix B, Subpart IX -

“Replacement of Cast Iron Pipe.”

2. Permanent Support – Cast Iron

a. The Exhibit III drawing depicts a type of temporary support for a gas main that is exposed or undermined by a parallel excavation.

b. The policy of CNG/SCG is to replace the cast iron pipe at the excavator’s/contractor’s expense.

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B102

Exhibit I

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B103

Exhibit II

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B104

Exhibit III

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B105

Exhibit IV (CNG)

Excavator’s Name

Excavator’s Address

City, State, Zip

Re:

Gentlemen:

Connecticut Natural Gas Construction Site Inspector, , states that as a result of your excavating operations on , approximately feet of inch cast iron pipe was exposed and/or undermined.

It is the responsibility of the excavator to exercise reasonable care in accordance with the State of Connecticut

Public Act 87-71, Section 16-345-4, Responsibility of Excavators:

(“a”) [V] (5) Exercise reasonable care when working in proximity to the under-ground facilities of any public utility. REASONABLE CARE SHALL INCLUDE, WITHOUT LIMITATION, THE USE OF

CONSTRUCTION METHODS APPROPRIATE TO ENSURE THE INTEGRITY OF EXISTING

UTILITY FACILITIES AND THEIR TEMPORARY AND PERMANENT SUPPORT INCLUDING

BUT NOT LIMITED TO ADEQUATE AND PROPER SHORING AND PROPER BACKFILL

METHODS AND TECHNIQUES; THE SELECTION OF EQUIPMENT AND EXPLOSIVES

CAPABLE OF PERFORMING THE WORK WITH THE MINIMUM REASONABLE

LIKELIHOOD OF DISTURBANCE TO UNDERGROUND FACILITIES; ADEQUATE

SUPERVISORY PERSONNEL TO ENSURE PROPER ACTIONS; PROPER UNDERSTANDING

BY THE PERSONNEL ON THE JOB SITE OF THE AUTHORITY OF ALL PARTIES INVOLVED

IN THE ACTIVITY SO THAT PROMPT ACTION CAN BE TAKEN IN THE EVENT OF

UNANTICIPATED CONTACT WITH UNDERGROUND FACILITIES; ADEQUATE TRAINING

OF EMPLOYEES IN EXECUTING THEIR ASSIGNMENTS TO ENSURE PROTECTION OF

UTILITY FACILITIES AND THE PUBLIC; MAINTAINING NECESSARY LIAISON WITH

OWNERS OF UNDERGROUND FACILITIES; SPONSORING PREPLANNING AND

PRECONSTRUCTION MEETINGS AS NECESSARY AND COMPLYING WITH ALL

APPLICABLE LAWS AND REGULATIONS.

The cast iron pipe appears to have been undermined to an extent that jeopardizes the integrity of the facility. As a result, replacement of the facility in the immediate vicinity of excavation may be necessary. If replacement is necessary, a bill for the replacement will be submitted to you in the near future once the work is complete.

If you have any questions regarding this matter, please contact me.

Very truly yours, Construction Site Inspector

PROTECTION & REPLACEMENT OF EXPOSED GAS FACILITIES

02/02/2021 Rev. 1, Page No. B106

Exhibit IV (SCG)

Excavator’s Name

Excavator’s Address

City, State, Zip

Re:

Gentlemen:

The Southern Connecticut Gas Company Site Inspector, , states that as a result of your excavating operations on , approximately feet of inch cast iron pipe was exposed and/or undermined.

It is the responsibility of the excavator to exercise reasonable care in accordance with the State of Connecticut

Public Act 87-71, Section 16-345-4, Responsibility of Excavators:

(“a”) [V] (5) Exercise reasonable care when working in proximity to the under-ground facilities of any public utility. REASONABLE CARE SHALL INCLUDE, WITHOUT LIMITATION, THE USE OF

CONSTRUCTION METHODS APPROPRIATE TO ENSURE THE INTEGRITY OF EXISTING

UTILITY FACILITIES AND THEIR TEMPORARY AND PERMANENT SUPPORT INCLUDING

BUT NOT LIMITED TO ADEQUATE AND PROPER SHORING AND PROPER BACKFILL

METHODS AND TECHNIQUES; THE SELECTION OF EQUIPMENT AND EXPLOSIVES

CAPABLE OF PERFORMING THE WORK WITH THE MINIMUM REASONABLE

LIKELIHOOD OF DISTURBANCE TO UNDERGROUND FACILITIES; ADEQUATE

SUPERVISORY PERSONNEL TO ENSURE PROPER ACTIONS; PROPER UNDERSTANDING

BY THE PERSONNEL ON THE JOB SITE OF THE AUTHORITY OF ALL PARTIES INVOLVED

IN THE ACTIVITY SO THAT PROMPT ACTION CAN BE TAKEN IN THE EVENT OF

UNANTICIPATED CONTACT WITH UNDERGROUND FACILITIES; ADEQUATE TRAINING

OF EMPLOYEES IN EXECUTING THEIR ASSIGNMENTS TO ENSURE PROTECTION OF

UTILITY FACILITIES AND THE PUBLIC; MAINTAINING NECESSARY LIAISON WITH

OWNERS OF UNDERGROUND FACILITIES; SPONSORING PREPLANNING AND

PRECONSTRUCTION MEETINGS AS NECESSARY AND COMPLYING WITH ALL

APPLICABLE LAWS AND REGULATIONS.”

The cast iron pipe appears to have been undermined to an extent that jeopardizes the integrity of the facility. As a result, replacement of the facility in the immediate vicinity of excavation may be necessary. If replacement is necessary, a bill for the replacement will be submitted to you in the near future once the work is complete.

If you have any questions regarding this matter, please contact me.

Very truly yours, Construction Site Inspector