Governor's Office Emergency Services
Hazardous Materials Spill Report

    DATE: 02/04/2023
    TIME: 1638
    RECEIVED BY:
    CONTROL#:
    Cal OES - 23-0965
    NRC -
1.a. PERSON NOTIFYING Cal OES:
1. NAME:2. AGENCY:3. PHONE#:4. Ext:5. PAG/CELL:
San Francisco Public Utilities Commission
1.b. PERSON REPORTING SPILL (If different from above):
1. NAME:2. AGENCY:3. PHONE#:4. Ext:5. PAG/CELL:
2. SUBSTANCE TYPE:
2. a. SUBSTANCE:b.QTY:>=<Amount Measurec. TYPE:d. OTHER:e. PIPELINEf. VESSEL
>= 300 Tons
1. Sulfur Hexafluoride<1000 ppm Lbs.VAPORNoNo
2. = NoNo
3. = NoNo
g. DESCRIPTION: ***Potential Release*** Hetch Hetchy Gas staff members determined that there may be a sulfur hexafluoride gas leak after attempting to trouble shoot faulty equipment and adding 20.9 lbs of SF6 to breaker CB420 at the Warnerville switch yard substation. To mitigate the situation, APS has been contracted to respond and detect the leak and repair, it is unknown when APS will be onsite to repair. Staff used an SF6 gas detector and were not able to detect a leak and operations have resumed, the detector will be used throughout the day until the leak is repaired to ensure there is no release occurring.
h. STOPPAGE/CONTAINMENT:i. WATER INVOLVED: j. WATERWAY:k. DRINKING WATER IMPACTED
Unknown if stopped, Unknown if containedNoNoNo
l. MARITIME VESSEL
No		m. KNOWN IMPACT
None
3. a. INCIDENT LOCATION: 10501 Warnerville Road
b. CITY:c. COUNTY: d. ZIP:
Oakdale
Stanislaus CountySAN JOAQUIN VALLEY UNIFIED APCD
4. INCIDENT DESCRIPTION:
a. DATE:b. TIME (Military):c. SITE:d. REPORTED CAUSE
02/02/2023Unknown Merchant/Business Unknown
e. INJURIESf. FATALITY g. EVACUATIONh. CLEANUP BY:
NoNoNoContractor
6. NOTIFICATION INFORMATION:
a. ON SCENE:b. OTHER ON SCENE: c. OTHER NOTIFIED:
ARB, CUPA
d. ADMIN. AGENCY: Stanislaus County Environmental Resourcese. SEC. AGENCY:
f. ADDITIONAL COUNTY: g. ADMIN. AGENCY:
h. NOTIFICATION LIST:
Cal GEM:
RWQCB Unit:

5B
Cal OES Region:
AA/CUPA, DTSC, RWQCB, US EPA, USFWS, AIR RESOURCES BD, Co/WP, Co/E-Hlth
Photo Attachment:
11. Cal OES Reg.
********* Control No: 23-0965 *********

Created by: Warning Center on: 02/04/2023 04:38:23 PM Last Modified by: Warning Center on: 02/04/2023 04:53:06 PM