SCH Number 2004091104

Project Info

Title

Injection of Gaseous Ozone at 76 Station 0971

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.

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