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Project Overview (Cont.) <br /> ■ The benzene plume extended approx. 175 feet. <br /> ■ At the start of remediation, we estimated there to be <br /> 200 gal (750 L) NAPL, 700 kg sorbed phase TPH, 1 .5 C <br /> kg dissolved-phase BTEX, and 5 kg dissolved-phased <br /> MtBE. <br /> ■ By early 2402, a Corrective Action Pian for ozone <br /> sparging was approved by the North Coast Regional <br /> Water- Quality CoritrolBoarcl� <br /> it Installation of the ozone system began in mid-October C <br /> 2002 and sparging began in early November. <br />