Phillips 66 Company - Issuance of a modified Permit to Operate for Three External Floating Roof Tanks, Sources 180, 341 and 342 (Air District Application 724166
Summary
SCH Number
2026051171
Public Agency
Bay Area Air Quality Management District
(BAAQMD)
Document Title
Phillips 66 Company - Issuance of a modified Permit to Operate for Three External Floating Roof Tanks, Sources 180, 341 and 342 (Air District Application 724166
Document Type
NOE - Notice of Exemption
Received
Posted
5/28/2026
Document Description
The Air District has issued a modification to the Permit to Operate for the following existing sources: S-180 Tank# 292 External Floating Roof Tank, Maximum Capacity: 1,974 thousand Gallons; Diameter:100 feet Materials Stored : Renewable Jet; Maximum Throughput: 22,500 barrels per day, 8,212,500 barrels per year; Maximum True Vapor Pressure~ 2.5 psia S-341 Tank# 208
External Floating Roof Tank, Maximum Capacity: 4,326 thousand Gallons; Diameter: 120 feet; Materials Stored: Renewable Jet; Maximum Throughput: 20,750 barrels per day, 7,573,750 barrels per year; Maximum True Vapor Pressure~ 2.5 psia S-342 Tank# 209 External Floating Roof Tank, Maximum Capacity:4,326 thousand gallons, 120.feet diameter, Materials Stored : Renewable Jet; Maximum Throughput: 20,750 barrels per day, 7,573,750 barrels per year; Maximum True Vapor Pressure~ 2.5 psia
1/2 Phillips 66 has proposed increasing the permitted daily and annual throughput limits for tanks S-341 and S-342, as described above. In addition, tank S-180, previously classified as exempt, will be permitted to function as a backup storage tank during maintenance outages of S-341 and S-342. Although the proposed changes are expected to increase precursor organic compound (POC) emissions, Phillips 66 has stated that gasoline will no longer be stored in tanks S-341 and S-342. The potential POC emissions of S- 341 will increase from 1.38 to 1.55 tpy and for S-342, the potential POC emissions will increase from 0.39 to 1.55 tpy. S-180 does not have any permitted emissions because it was previously exempt but it will see an increase in potential emissions from O tpy to 1.41 tpy as it changes to a permitted source. The tanks will comply with the best available control technology (BACT) requirement for POCs by complying with Regulation 8, Rule 5, which establishes standards for storage tanks containing organic liquids, including external floating roof tanks.
The rule requires primary and secondary rim seals, controlled deck fittings, and routine inspection and maintenance to minimize gaps, leaks, and evaporative losses, thereby reducing POC emissions. While the POC emissions are expected to increase, the overall toxic air contaminants (TACs) are expected to decrease because the previous TAC emissions were based on gasoline. However, since gasoline will no longer be stored and will be replaced with renewable jet fuel TACs are projected to decrease post project. The proposed modifications do not exceed the acute and/or chronic thresholds established under Regulation 2, Rule 5 for TACs.
No physical modifications will be made to the tanks, and the throughput increase will not result in the addition of new fugitive emission components. Phillips 66 will provide 3.14 tpy of POC emission reduction credits (ERC) from banking certificate# 1706 to offset the POC emission increase in this application.
Contact Information
Name
Ali Roohani
Agency Name
Bay Area Air Quality Management District (Air District)
Job Title
Senior Air Quality Engineer
Contact Types
Lead/Public Agency
Phone
Email
Name
Brent Eastep
Agency Name
Phillips 66
Job Title
Environmental Specialist
Contact Types
Project Applicant
Phone
Email
Location
Coordinates
Cities
rodeo
Counties
Contra Costa
Regions
Northern California, San Francisco Bay Area
Cross Streets
Internal Road 8 and Road J
Zip
94572
Other Location Info
1380 San Pablo Ave., Rodeo, Contra Costa County, CA 94572
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 categorical exemption (CEQA Guidelines§ 15301).
Reasons for Exemption
This permit action is exempt from CEQA because the project involves negligible or no
expansion of use for the existing facility. The existing use of the facility is as a refinery processing renewable feedstocks, with considerable on-site storage. The three sources at issue in this permit decision are existing storage tanks. This permit action is exempt from CEQA because the throughput increase for the three tanks will not expand the facility's normal operation significantly and will result in an increase of, at most, 2.7335 tpy of POC emissions, which is well below the 10 tpy significance threshold that the Air District has set for POCs and less than 3% of the facility's potential POC emissions. Further, the permit decision does not permit any alterations to the tanks themselves-the permit decision relates only to what is stored in the tanks.
County Clerk
Contra Costa
Attachments
Notice of Exemption
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