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OR Levine+ncke Revised • 8.2 GOS Pilot Test Overview Ozone has proven to be effective in destroying a wide variety of organic chemicals, including chlorinated VOCs Ozone sparging is an in situ remediation technology for VOCs in groundwater The technology uses a variation of the aur sparging process and consists of sparging of small ozone-contauung nucroporous bubbles into the saturated zone The sparguig of ozone gas in micro-parous bubbles maximizes the contact between the ozone bubbles and VOCs in groundwater Ozone is an oxidizing gas that detoxifies chlorinated compounds such as PCE by decomposing them into byproducts such as carbon dioxide and very dilute HCl, which then react to form mineral salts Unlike air sparging techniques, this technology usually does not require vapor control because oxidation reactions are completed before vapor flow reaches the unsaturated zone Therefore, little or no untreated emissions enter the overlying soil However, LFR will collect data during the pilot test to confirm that the SVE captures any untreated vapors that may enter the vadose zoite and to verify that SVE is not necessary for full-scale ozone sparging unplementation- In addition, the combined SVE/GOS Phase IV pilot test will provide data to assess the suitability of the technologies to remediate both the vadose zone and the shallow groundwater beneath the Guild Gleaners Property. LFR proposes to use a self-contained ozone-air sparging system used during the Phase III pilot test for the Phase IV GOS testing During the Phase III test, only the air sparging component of the C-Sparge system will be used However, during the Phase IV SVE/GOS pilot test, the ozone generator within the sparge system will be put into use and ozone will be sparged into the shallow-zone groundwater Microporous ozone bubbles will be sparged through tubing to the sparge point that is designed to generate very small bubbles, i e., approximately 50 micrometers in diameter Micro bobbles will be forced out into the surrounding water-bearing formation The control panel within the sparge system will be used to regulate the frequency/duration of ozone sparging and on/off sequencing of sparging Microporous ozone bubbles sparged into the formation will come into contact with affected groundwater, where contaminants in groundwater will be oxidized and volatilized into the air bubble and will be carried to the vadose zone where it will be captured by the SVE system The pnmary tool for developing design requirements for a GOS system will be the pilot testing program described in the following sections The GOS pilot testing program is proposed at the locations depicted on Figure 10 The well locations in which ozone sparging will be conducted are described in Section 8 3 8.3 Dual-Purpose SVE/Sparge Well Equipment The wells to be used us the Phase IV pilot test program will be the nme wells mstalled as part of this pilot test program plus existing groundwater momtonng wells MW-09 WPSV cs Lad,-mv-N123 doc irr 02/so d 8€T0b9b60Et 01 906V ZS9 01S BA31 =J 3NIA3-1 831 dd ep 9I 20, 60 -fnr