Governor's Office Emergency Services
Hazardous Materials Spill Report

    DATE: 08/29/2024
    TIME: 1049
    RECEIVED BY:
    CONTROL#:
    Cal OES - 24-4885
    NRC -
1.a. PERSON NOTIFYING Cal OES:
1. NAME:2. AGENCY:3. PHONE#:4. Ext:5. PAG/CELL:
Contra Costa Water District
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. Clay Drilling fluid=2,000-3,000 Gal(s)OTHERBentonite ClayNoNo
2. = NoNo
3. = NoNo
g. DESCRIPTION: Per reporting party, During drilling operations, approximately 2,000-3,000 gallons of Non-hazardous clay were released, affecting a waterway near Lower Walnut Creek. The release has been stopped and contained, and cleanup efforts have began by the reporting party
h. STOPPAGE/CONTAINMENT:i. WATER INVOLVED: j. WATERWAY:k. DRINKING WATER IMPACTED
Stopped, ContainedYesWetland area / Near Walnut CreekNo
l. MARITIME VESSEL
No		m. KNOWN IMPACT
None
3. a. INCIDENT LOCATION: Marathon Refinery, LAT: 38.019216 / LONG: -122.069996
b. CITY:c. COUNTY: d. ZIP:
Concord
Contra Costa County94518BAY AREA AQMD
4. INCIDENT DESCRIPTION:
a. DATE:b. TIME (Military):c. SITE:d. REPORTED CAUSE
08/29/20240654 Waterways Other
Description for Other : Drilling Operations
e. INJURIESf. FATALITY g. EVACUATIONh. CLEANUP BY:
NoNoNoReporting Party
6. NOTIFICATION INFORMATION:
a. ON SCENE:b. OTHER ON SCENE: c. OTHER NOTIFIED:
d. ADMIN. AGENCY: Contra Costa County Health Services Departmente. SEC. AGENCY:
f. ADDITIONAL COUNTY: g. ADMIN. AGENCY:
h. NOTIFICATION LIST:
Cal GEM:
RWQCB Unit:

2
Cal OES Region:
AA/CUPA, DTSC, RWQCB, US EPA, USFWS, DFW-OSPR, CDPH-D.O., LANDS, PARKS & REC, USCG, Co/WP, Co/Hlth, Co/E-Hlth
Photo Attachment:
11. Cal OES Reg.
********* Control No: 24-4885 *********

Created by: Warning Center on: 08/29/2024 10:49:37 AM Last Modified by: Warning Center on: 08/29/2024 11:08:41 AM