Avista GD 2024

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: 6/30/2026
Initial Date 03/11/2024
Submitted:
U.S.Department of Transportation ANNUAL REPORT FOR CALENDAR
Pipeline and Hazardous Materials
YEAR 2023 Type
ert Submission INITIAL
Safety Administration GAS DISTRIBUTION SYSTEM
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 20 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
http://www.phmsa.dot.gov/pipeline/library/forms.
PART A-OPERATOR INFORMATION (DOT use only 20240796-58102
1.Name of Operator AVISTA CORP
2.LOCATION OF OFFICE(WHERE ADDITIONAL INFORMATION MAY BE OBTAINED)
2a.Street Address 1411 East Mission Ave
2b.City and County Spokane Washington
2c.State WA
2d.Zip Code 99202
3.OPERATOR'S 5 DIGIT IDENTIFICATION NUMBER 31232
4.HEADQUARTERS NAME&ADDRESS
4a.Street Address 1411 East Mission(PO Box 3727,99220-3727)
4b.City and County Spokane
4c.State WA
4d.Zip Code 99202
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 OPID.)
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
PART B-SYSTEM DESCRIPTION
1.GENERAL
STEEL
UNPROTECTED CATHODICALLY PLASTIC CAST/ DUCTILE COPPER OTHER RECONDITION SYSTEM
PROTECTED WROUGHT IRON ED TOTAL
IRON CAST IRON
BARE COATED BARE COATED
MILES OF 533.22 1677.97 0 0 0 0 0 2211.19
MAIN
NO.OF 11595 77323 0 0 0 0 0 88918
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: 6/30/2026
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"
STEEL 0 330.375 115.876 84.65 2.317 0.002 533.22
DUCTILE IRON 0 0 0 0 0 0 0
COPPER 0 0 0 0 0 0 0
CAST/WROUGHT 0 0 0 0 0 0 0
IRON
PLASTIC PVC 0 0 0 0 0 0 0
PLASTIC PE 0 1254.267 295.05 128.653 0 0 1677.97
PLASTIC ABS 0 0 0 0 0 0 0
PLASTIC OTHER 0 0 0 0 0 0 0
OTHER 0 0 0 0 0 0 0
RECONDITIONED 0 0 0 0 0 0 0
CASTIRON
TOTAL 0 1584.642 410.926 213.303 2.317 0.002 2211.19
Describe Other Material:
3.NUMBER OF SERVICES IN SYSTEM AT END OF YEAR AVERAGE SERVICE LENGTH:89
MATERIAL UNKNOWN 1"OR LESS OVER 1" OVER 2" OVER 4" OVER 8" SYSTEM TOTALS
THRU 2" THRU 4" THRU 8"
STEEL 192 11236 158 8 1 0 11595
DUCTILE IRON 0 0 0 0 0 0 0
COPPER 0 0 0 0 0 0 0
CAST/WROUGHT IRON 0 0 0 0 0 0 0
PLASTIC PVC 0 0 0 0 0 0 0
PLASTIC PE 397 76533 378 11 4 0 77323
PLASTIC ABS 0 0 0 0 0 0 0
PLASTIC OTHER 0 0 0 0 0 0 0
OTHER 0 0 0 0 0 0 0
RECONDITIONED 0 0 0 0 0 0 0
CASTIRON
TOTAL 589 87769 536 19 5 0 88918
Describe Other Material:
4.MILES OF MAIN AND NUMBER OF SERVICES BY DECADE OF INSTALLATION
UNKNOWN PRE-1940 1940-1949 1950-1959 1960-1969 1970-1979 1980-1989 1990-1999 2000-2009 2010-2019 2020-2029 TOTAL
MILES OF 4.64 0 0 90.284 293.466 111.887 91.199 762.005 478.222 229.568 149.919 2211.19
MAIN
NUMBER
OF 1043 0 0 691 6302 4846 4960 28975 19277 15011 7813 88918
SERVICES
PART C-TOTAL LEAKS AND HAZARDOUS LEAKS ELIMINATED/REPAIRED DURING THE YEAR
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: 6/30/2026
MAINS SERVICES
CAUSE OF LEAK
TOTAL HAZARDOUS TOTAL HAZARDOUS
CORROSION FAILURE 0 0 2 2
NATURAL FORCE DAMAGE 1 1 13 9
EXCAVATION DAMAGE 16 16 97 96
OTHER OUTSIDE FORCE DAMAGE 1 1 14 10
PIPE,WELD OR JOINT FAILURE 4 2 17 9
EQUIPMENT FAILURE 4 2 88 3
INCORRECT OPERATIONS 0 0 8 2
OTHER CAUSE 1 0 4 4
NUMBER OF KNOWN SYSTEM LEAKS AT END OF YEAR SCHEDULED FOR REPAIR:31
NUMBER OF HAZARDOUS LEAKS INVOLVING A MECHANICAL JOINT FAILURE: 6
PART D-EXCAVATION DAMAGE PART E—RESERVED
1.TOTAL NUMBER OF EXCAVATION DAMAGES BY APPARENT
ROOT CAUSE: 122
a. One-Call Notification Practices Not Sufficient: 62
b. Locating Practices Not Sufficient: 14
c. Excavation Practices Not Sufficient: 41
d. Other: 5
2.NUMBER OF EXCAVATION TICKETS 32813
PART F-LEAKS ON FEDERAL LAND PART G—PERCENT OF UNACCOUNTED FOR GAS
TOTAL NUMBER OF LEAKS ON FEDERAL LAND REPAIRED OR
SCHEDULED TO REPAIR:0 UNACCOUNTED FOR GAS AS A PERCENT OF TOTAL CONSUMPTION
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: 0.55%
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: 6/30/2026
INFORMATION
Part C-28 leaks were carried over from 2022:8 were repaired in 2023, 10 were non-reportable once repaired,7 were found not to be gas leak
onceinvesti ated, 2 were duplicate leaks that were in-fact repaired in 2022,and was carried over into 2024.
PARTI-PREPARER
Dylan Karaus Integrity Program Manager [phone]
(Preparer's Name and Title) (Area Code and Telephone Number)
[e-mail] [phone]
(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