IGC GD 2021

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
Initial Date 03/14/2022
Submitted:
COU.S. Department of Transportation 2021 ANNUAL REPORT FOR CALENDAR YEAR Report
Pipeline and Hazardous Materials Submission INITIAL
Safety Administration GAS DISTRIBUTION SYSTEM Type
Date Submitted:
A federal agency may not conduct or sponsor,and a person is not required to respond to,nor shall a person be subject to a penalty for failure to comply with a collection of
information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control
Number for this information collection is 2137-0629. Public reporting for this collection of information is estimated to be approximately 16 hours per response,including the
time for reviewing instructions,gathering the data needed,and completing and reviewing the collection of information. All responses to this collection of information are
mandatory. Send comments regarding this burden estimate or any other aspect of this collection of information,including suggestions for reducing this burden to:Information
Collection Clearance Officer,PHMSA,Office of Pipeline Safety(PHP-30)1200 New Jersey Avenue,SE,Washington,D.C.20590.
Important: Please read the separate instructions for completing this form before you begin. They clarify the information requested and provide specific
examples. If you do not have a copy of the instructions,you can obtain one from the PHMSA Pipeline Safety Community Web Page at ham://www.
ohmsa.dot.go v/ppeline/library/forms.
PART A-OPERATOR INFORMATION (DOT use only) 20220977-46100
1.Name of Operator INTERMOUNTAIN GAS CO
2.LOCATION OF OFFICE(WHERE ADDITIONAL INFORMATION MAY BE OBTAINED)
2a.Street Address 555 South Cole Road
2b.City and County Boise
2c.State ID
2d.Zip Code 83709
3.OPERATOR'S 5 DIGIT IDENTIFICATION NUMBER 8160
4.HEADQUARTERS NAME&ADDRESS
4a.Street Address 555 SOUTH COLE ROAD
4b.City and County BOISE
4c.State ID
4d.Zip Code 83709
5.STATE IN WHICH SYSTEM OPERATES ID
6.THIS REPORT PERTAINS TO THE FOLLOWING COMMODITY GROUP(Select Commodity Group based on the predominant gas carried and
complete the report for that Commodity Group.File a separate report for each Commodity Group included in this OP/D.)
Natural Gas
7.THIS REPORT PERTAINS TO THE FOLLOWING TYPE OF OPERATOR(Select Type of Operator based on the structure of the company
included in this OP/D for which this report is being submitted.):
Investor Owned
ART B-SYSTEM DESCRIPTION 71
1.GENERAL
STEEL
UNPROTECTED CATHODICALLY PLASTIC CAST/ RECONDITION
DUCTILE COPPE SYSTEM
PROTECTED WROUGHT IRON R OTHER ED TOTAL
IRON CAST IRON
BARE COATED BARE COATED
MILES OF 1.3 2369.3 4607.63 0 0 0 0 0 6978.23
MAIN
NO.OF 71933 331077 0 0 0 0 0 403010
SERVICES
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg. 1 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
2.MILES OF MAINS IN SYSTEM AT END OF YEAR
MATERIAL UNKNOWN 2"OR LESS OVER 2" OVER 4" OVER 8" OVER 12" SYSTEM TOTALS
THRU 4" THRU 8" THRU 12"
2370.61
STEEL 0 1333.09 625.18 371.59 40.75 0
0
DUCTILE IRON 0 0 0 0 0 0
0
COPPER 0 0 0 0 0 0
CAST/WROUGH 0 0 0 0 0 0 0
T IRON
0
PLASTIC PVC 0 0 0 0 0 0
4607.63
PLASTIC PE 0 3880.27 679.9 47.46 0 0
0
PLASTIC ABS 0 0 0 0 0 0
PLASTIC 0 0 0 0 0 0 0
OTHER
0
OTHER 0 0 0 0 0 0
RECONDITIONE 0 0 0 0 0 0 0
D CAST IRON
6978.24
TOTAL 0 5213.36 1305.08 419.05 40.75 0
Describe Other Material:
T--
3.NUMBER OF SERVICES IN SYSTEM AT END OF YEAR AVERAGE SERVICE LENGTH:83.2
MATERIAL UNKNOWN 1"OR LESS OVER 1" OVER 2" OVER 4" OVER 8" SYSTEM TOTALS
THRU 2" THRU 4" THRU 8"
71933
STEEL 0 69972 1845 105 11 0
0
DUCTILE IRON 0 0 0 0 0 0
0
COPPER 0 0 0 0 0 0
CAST/WROUGH 0 0 0 0 0 0 0
T IRON
0
PLASTIC PVC 0 0 0 0 0 0
331077
PLASTIC PE 0 326412 4594 70 1 0
0
PLASTIC ABS 0 0 0 0 0 0
PLASTIC 0 0 0 0 0 0 0
OTHER
0
OTHER 0 0 0 0 0 0
RECONDITIONE 0 0 0 0 0 0 0
D CAST IRON
403010
TOTAL 0 396384 6439 175 12 0
Describe Other Material:
4.MILES OF MAIN AND NUMBER OF SERVICES BY DECADE OF INSTALLATION
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg. 2 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
PRE- 1940- 1950- 1960- 1970- 1980- 1990- 2000- 2010- 2020-
UNKNOWN 1940 1949 1959 1969 1979 1989 1999 2009 2019 2029 TOTAL
MILES OF 0 0 0 668.36 1057.05 716.97 358.4 1345.82 1671.67 867.86 292.11 6978.24
MAIN
NUMBER
OF 0 0 0 14909 31609 30391 27369 92003 114187 68990 23552 403010
SERVICES
PART C-TOTAL LEAKS AND HAZARDOUS LEAKS ELIMINATED/REPAIRED DURING THE YEAR
CAUSE OF LEAK MAINS SERVICES
TOTAL HAZARDOUS TOTAL HAZARDOUS
CORROSION FAILURE 2 2 6 2
NATURAL FORCE DAMAGE 1 1 14 6
EXCAVATION DAMAGE 72 66 667 651
OTHER OUTSIDE FORCE 0 0 37 16
DAMAGE
PIPE,WELD OR JOINT FAILURE 18 8 39 17
EQUIPMENT FAILURE 22 3 1046 114
INCORRECT OPERATIONS 1 0 3 1
OTHER CAUSE 1 1 5 1
NUMBER OF KNOWN SYSTEM LEAKS AT END OF YEAR SCHEDULED FOR REPAIR:12
NUMBER OF HAZARDOUS LEAKS INVOLVING A MECHANICAL JOINT FAILURE: 8
PART D-EXCAVATION DAMAGE PART E-EXCESS FLOW VALUE(EFV)AND SERVICE VALVE DATA
1.TOTAL NUMBER OF EXCAVATION DAMAGES BY APPARENT Total Number Of Services with EFV Installed During Year: 6001
ROOT CAUSE: 796
a. One-Call Notification Practices Not Sufficient: 358 Estimated Number Of Services with EFV In the System At End Of Year:
90965
b. Locating Practices Not Sufficient: 90
*Total Number of Manual Service Line Shut-off Valves Installed During
c. Excavation Practices Not Sufficient: 343 Year: 16
d. Other: 5
Estimated Number of Services with Manual Service Line Shut-off Valves
Installed in the System at End of Year: 677
*These questions were added to the report in 2017.
2. NUMBER OF EXCAVATION TICKETS : 134841
PART F-LEAKS ON FEDERAL LAND PART G-PERCENT OF UNACCOUNTED FOR GAS
TOTAL NUMBER OF LEAKS ON FEDERAL LAND REPAIRED OR UNACCOUNTED FOR GAS AS A PERCENT OF TOTAL CONSUMPTION
SCHEDULED TO REPAIR: 0 FOR THE 12 MONTHS ENDING JUNE 30 OF THE REPORTING YEAR.
[(PURCHASED GAS+PRODUCED GAS)MINUS(CUSTOMER USE+
COMPANY USE+APPROPRIATE ADJUSTMENTS)]DIVIDED BY
(CUSTOMER USE+COMPANY USE+APPROPRIATE ADJUSTMENTS)
TIMES 100 EQUALS PERCENT UNACCOUNTED FOR.
FOR YEAR ENDING 6/30: 0
PART H-ADDITIONAL INFORMATION
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg.3 of 4

NOTICE: This report is required by 49 CFR Part 191. Failure to report may result in a civil penalty OMB No.2137-0629 as OMB NO:2137-0629
provided in 49 USC 60122. EXPIRATION DATE: 5/31/2024
PARTI-PREPARER
Colby Lundstrom,Manager of Compliance [phone]
(Preparer's Name and Title) (Area Code and Telephone Number)
[e-mail]
(Preparer's email address) (Area Code and Facsimile Number)
Form PHMSA F 7100.1-1 (rev 5-2021) Reproduction of this form is permitted Pg.4 of 4