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I <br /> S E C 0 R <br /> • Mr Mike Infurna <br /> October 29, 2004 <br /> Page 6 <br /> Groundwater Batch Extraction <br /> Currently offsite extraction wells EW-2, EW-3, EW-4, and EW-5 are pumped on a weekly basis, and <br /> the water is treated through the on-site GWE system Twelve batch extraction events were conducted <br /> during the third quarter 2004, which resulted in the removal of 11,650 gallons from the off-site <br /> extraction wells <br /> Future Remedial Expansion at ARCO 4932 <br /> SJSEHD has approved the installation an ozone sparge system with a barrier of wells installed in the <br /> sidewalk on the north side to Harding Way The ozone barrier will inhibit the migration hydrocarbons <br /> down gradient and stimulate bioattenuation Weekly batch extraction events from wells EW-2, EW-3, <br /> EWA and EW-5 will continue until the installation of the offsite ozone sparge remedial system is <br /> operational It is anticipated that the ozone system will be operational by February 2005 <br /> LIMITATIONS <br /> This report presents our understanding of existing conditions at the subject site The conclusions <br /> contained herein are based on the analytical results, and professional Judgment in accordance with <br /> current standards of professional practice, no other warranty is expressed or implied SECOR <br /> assumes no responsibility for exploratory borings or data reported by other consultants or <br /> contractors <br /> Y <br /> f y <br /> F <br /> ilR <br /> A <br /> ErW <br /> k <br /> 4`} <br /> } <br /> j <br /> f lconocoPhilhpslTosco Marketing144091Qssrs120041302004_QSR doc SECOR International incorporated <br />