Injection of Gaseous Ozone at 76 Station 0971
2 Documents in Project
Summary
SCH Number
2004091104
Lead Agency
Regional Water Quality Control Board, Region 4 (Los Angeles)
Document Title
Injection of Gaseous Ozone at 76 Station 0971
Document Type
NOD - Notice of Determination
Received
Posted
12/28/2004
Document Description
Under the oversight of the Regional Board, ConocoPhillips proposes to install and operate a C-Sparge system to remediate the dissolved-phase petroleum hydro-carbon plume beneath the site. The C-Sparge technology combines low-flow (3 to 5 cubic feet per minute [cfm] air sparging with ozonization to oxidize petroleum hydrocarbons into benign byproducts, carbon dioxide and water. Ozone is generated onsite using a control panel with built-in compressor and ozone generator. Using perforated sparge points, microbubbles (10 to 50 um) of encapsulated ozone are introduced below the water table, where the oxidation reactions take place.
Seven sparge points, integral to the C-Sparge system, will be used onsite within the dissolved-phase plume. Using a control panel with a built-in compressor and ozone generator, microbubbles of encapsulated ozone will be introduced into the subsurface through a given sparge point or points at flow rates ranging from 3 to 5 cubic feet per minute (cfm). During sparging, no groundwater or vapors will be extracted. Sparging will be performed on a cycled basis with each well cycled on for 5 to 10 minutes.
During C-Sparge system operations, microbubbles of encapsulated ozone will be discharged into the subsurface beneath the site. No other known constituents wil be discharged to the subsurface during system operations. The C-Sparge system will inject approximately five grams per hour of ozone at the flow rate of 3 to 5 cfm. Therefore, the total concentration of ozone injected into the subsurface during system operations will be approximately 0.59 miligram per liter.
Contact Information
Name
Orlando H. Gonzalez
Agency Name
Regional Water Quality Control Board, Region 4 (Los Angeles)
Contact Types
Lead/Public Agency
Phone
Location
Cities
Beverly Hills
Counties
Los Angeles
Cross Streets
Santa Monica
Zip
90210
Parcel #
433-022-9006
Notice of Determination
Approving Agency
California Regional Water Quality Control Board, Los Angeles Reg
Approving Agency Role
Lead Agency
Approved On
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
N/A
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
N/A
Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.