Exelon Energy Delivery Confidential – All Rights Reserved 

# [COMPANY C] Administrative Procedure Gas Leakage Surveys GO-PE-104 Rev. 0 Effective:10-29-2004 (Supersedes M-G-511) Level: 3 Review Type: XXXX Page 1 of 8

1 PURPOSE 1.1 To provide criteria for conducting natural gas leakage surveys. 1.2 To ensure compliance with Code of F ederal Regulations 49 CFR 192.706, 192.723 and Pennsylvania Utility Commission (PUC) Code 59.33. 1.3 Section 6 has been divided into the following subsections:

Subsection Title Page 6.1 Frequency of Gas Leakage Surveys 4 6.2 Type of Gas Leakage Surveys 5

2 TERMS AND DEFINITIONS

2.1 Business Districts 2.1.1 Business Districts are the principle business areas in an urban community. In determining business districts, the following areas should be considered. 1. The general public regularly congregates for economic, industrial, religious, educational, health or recreational purposes. 2. The majority of the buildings on eit her side of the street are utilized for commercial, industrial, religious, educ ational, health or recreational purposes. 3. Gas facilities are under continuous paving that extends either from the centerline of the thoroughfar e to the building wall or from the main to the building wall. 4. Any other location or site that, in the judgment of the operator, should be so designated. 2.2 Distribution PipelineGO-PE-104 Rev. 0 Page 2 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 2.2.1 A pipeline owned by [COMPANY C] E nergy and operated at a pressure of 99 PSIG or less AND less than 20 percent of the SMYS.

2.3 Service Line 2.3.1 A pipeline that transports gas from a common source of supply to: 1. A customer meter or connection to a customer’s piping, whichever is farther downstream OR 2. The connection to a customer’s pipi ng if there is no customer meter. 2.4 Special One-time Surveys 2.4.1 Special one-time surveys should be considered following exposure of the pipeline to unusual stresses including; but not limited to: 1. When gas main pressure is being changed 2. When sewer, water, or other major foreign underground construction has occurred a Survey should be conducted prior to re-paving 3. Areas where blasting has occurred

2.5 SMYS: Specified Minimum Yield Strength

2.6 Transmission Line 2.6.1 A pipeline owned by [COMPANY C] E nergy and operates at pressures of 100 PSIG or more AND greater than 20 percent of the SMYS.

3 RESPONSIBILITIES 3.1 Gas Corrosion / Leak Survey & Regulatory Personnel 3.1.1 Survey natural gas transmission pipelines , distribution mains, and service lines in accordance with this procedure. 1. Classify leaks in accordance with GO- PE-541-801-Classification of Natural Gas Leaks. 2. Record leak number in accordance with OP-X-504-Procedure for Handling and Recording Outside Leaks.GO-PE-104 Rev. 0 Page 3 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 3. Complete Leakage Indication Report in accordance with M-X-229-100- Leakage Indication Report Completion Instructions. 3.1.2 Re-survey Class Type 3 and 4 leaks. 3.1.3 Forward completed Leakage Indication R eports for transmission pipelines to Gas Engineering. 3.1.4 Forward completed Leakage Indicati on Reports for distribution mains Gas Construction & Maintenance. 3.2 Retain Pipe Inspection / Leak Repair Repor ts for distribution mains for the life of the facility.

3.3 Gas Construction & Maintenance Personnel 3.3.1 Re-survey and re-classify Class Type 1 and 2 leaks on transmission pipelines and distribution mains. 1. Classify leaks in accordance with GO- PE-541-801-Classification of Natural Gas Leaks. 2. Record leak number in accordance with OP-X-504-Procedure for Handling and Recording Outside Leaks. 3. Complete Leakage Indication Report in accordance with M-X-229-100- Leakage Indication Report Completion Instructions. 3.3.2 Forward completed Leakage Indication Repor ts and Pipe Inspection / Leak Repair Reports for transmission pipe lines to Gas Engineering. 3.3.3 Retain completed Leakage Indication Repor ts for distribution mains for a period of three (3) years. 3.3.4 Forward completed Pipe Inspection / Leak Repair Report for distribution mains to Gas Corrosion / Leak Survey & Regulatory. 3.3.5 Enter all leak indication and repair data into the Leak Tracking Data Base. 3.4 Gas Engineering 3.4.1 Retain all Leakage Indication Reports and Pipe Inspection / Leak Repair Reports for transmission pipelines for the life of the facility.GO-PE-104 Rev. 0 Page 4 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 4 PRECAUTIONS AND LIMITATIONS

4.1 PRECAUTIONS

4.1.1 None

4.2 LIMITATIONS

4.2.1 None

5 PREREQUISITES

5.1 None

6 PROCEDURE 6.1 Frequency of Gas Leakage Surveys 6.1.1 Transmission pipelines shall be surveyed at intervals not exceeding 15 months, but at least once each calendar year. 6.1.2 Distribution mains shall be surveyed on the basis of probability of gas leakage and shall be scheduled as follows: 1. Coated cathodically protected steel mains and plastic mains shall be surveyed at intervals not exceeding 63 months, but at least once every five (5) calendar years. 2. Bare steel and unprotected coated st eel mains with no history of leakage shall be surveyed at intervals not exceeding 39 months, but at least once every three (3) years. 3. The following mains shall be surveyed at intervals not exceeding 15 months, but at least once every calendar year. a Mains in business districts, regardless of pipe material

b Cast iron mains c Once cathodically protected bare steel mains d Bare steel and unprotected coated steel mains not included in 6.1.2.2GO-PE-104 Rev. 0 Page 5 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 6.1.3 Service lines shall be surveyed on t he basis of probability of gas leakage and shall be scheduled at follows: 1. Coated cathodically protected steel li ne services and plastic line services shall be surveyed at intervals not exceeding 63 months, but at least once every five (5) calendar years. 2. Bare steel, unprotected coated steel, and copper line services shall be surveyed at intervals not exceeding 39 months, but at least once every three (3) years. 3. Service lines in business districts, regardless of pipe material, shall be surveyed at intervals not exceeding 15 months, but at least once every calendar year. 6.2 Type of Gas Leakage Surveys 6.2.1 Type of survey used is dependent on t he physical characteristics of the area surveyed. 6.2.2 Equipment used to conduct a survey is dependent on type of survey. 6.2.3 There are four (4) types of gas leakage survey as follows: 1. Mobile Survey is conducted along transmission pipelines and distribution mains that are outside of walking ar eas but accessible to a vehicle. a Mobile surveys should be conducted using high sensitivity gas detection equipment mounted in a vehicle. 2. Walking Survey is conducted along transmission pipelines and distribution mains and services where mobile surveys are ineffectual, such as but not limited to: Business Districts, Heavy Traffic Areas, Right-of-ways, Apartment Complexes, and Shopping Areas. a Walking Survey shall be conducted using portable high sensitivity gas detection equipment. b Walking Survey shall include sample test of the atmosphere in gas, electric, telephone, sewer, and water system manholes, cracks in pavement and sidewalks, at other locations providing an opportunity for locating potential gas leaks and at building wall lines in business district (wall-to-wall) paved areas. 3. Service Line Survey is conducted as a Walking Survey and includes walking the area over the gas service line from the gas main to the building line.GO-PE-104 Rev. 0 Page 6 of 8

Exelon Energy Delivery Confidential – All Rights Reserved a Service Line Survey is conducted with a portable, high sensitivity gas detector. b Service Line Survey shall include, in addition to test sampling over the service line, a visual inspection of the meter, regulator vent line, service riser valve, and any construction over the service.

c IF a hazardous OR potentially hazardous condition is detected, THEN the building SHALL be entered and surveyed. d Any unsatisfactory condition shall be referred to the appropriate Gas Construction & Maintenance supervisor. 4. Special One-time Survey is conducted when a transmission pipeline or distribution main or service line has been exposed to unusual stresses. a Special One-time Surveys shall be conducted using high sensitivity gas detection equipment appropriate to site conditions.

7 DOCUMENTATION 7.1 Leakage Indication Reports and Pipe Inspection / Leak Repair Reports for transmission pipelines shall be retained for the life of the facility. 7.2 Pipe Inspection / Leak Repair Reports for distribution mains shall be retained for the life of the facility. 7.3 Leakage Indication Reports for distribution mains for shall be retained three (3) years.

8 REFERENCES

8.1 SUPERCEDES M-G-511-PROCE DURE FOR GAS LEAKAGE SURVEYS 8.2 Supersedes Gas Instruction Letter, Mains & Services, Mains, Leaks 4-2, Gas Leak Surveys. 8.3 Supersedes Gas Instruction Letter, Mains & Services, Services, Maintenance 5-2, Residential and Commercial Custome r-Owned Underground Fuel Lines. 8.4 Supersedes Distribution Foreman’s M anual, III-B-3, Residential and Commercial Customer-Owned Underground Fuel Lines. 8.5 Supersedes Utilization Reference Ma nual, II-B-I, Residential and Commercial Customer-Owned Underground Fuel Lines.GO-PE-104 Rev. 0 Page 7 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 8.6 Code of Federal Regulations 49CFR 192.706 8.7 Code of Federal Regulations 49CFR 192.723

8.8 PUC Code 59.33 8.9 Code of Federal Regulations Guide Mate rial Appendix G-192-11 (Natural Gas).

8.10 Gas Procedure GO-PE-541-801-Classifi cation of Natural Gas Leaks. 8.11 Gas Procedure OP-X-504, Procedure for Handling and Recording Outside Leaks. 8.12 Gas Procedure M-X-229-100-Leakage Indicati on Report Completion Instructions.

9 ATTACHMENTS

9.1 NoneGO-PE-104 Rev. 0 Page 8 of 8

Exelon Energy Delivery Confidential – All Rights Reserved 10 DEVELOPMENT HISTORY

Revision 0 Date 10/15/2004 Writer William Nuss (Gas Engineering) Reviewer(s) Frank Dougherty (Gas Corrosion/Leak Survey & Regulatory); Edward Donegan (Gas Construction & Maintenance) Approver(s) Robert Baxley (Manager, Gas Construction & Maintenance), Timothy Flanagan (Manager, Gas Methods & Training), John Frantz (Manager, Gas Engineering), Nicole LeVine (Manager, Gas Corrosion/Leak Survey & Regulatory Reason Written Updated organizational names and re-formatted in accordance with the Exelon Management Model. Added additional classes of main leakage survey and leak survey intervals. Added clarity regar ding retention of LIR and PILR data. THIS PROCEDURE SUPERCEDES M-G-511.

Revision 1 Date XX/XX/XXXX Writer Writer’s Name (work group) [text will wrap as necessary for all lines in table] Reviewer(s) Reviewer’s Name (wor k group); Reviewer’s Name (work group) Approver(s) Approver’s Name(s) Reason Written Brief description expl aining why the procedure was written or revised.

Revision 2 Date XX/XX/XXXX Writer Writer’s Name (work group) [text will wrap as necessary for all lines in table] Reviewer(s) Reviewer’s Name (wor k group); Reviewer’s Name (work group) Approver(s) Approver’s Name(s) Reason Written Brief description expl aining why the procedure was written or revised.