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a <br /> a <br /> 7 CONCLUSIONS <br /> For the most part, monitoring wells MW-2 and MW-4, within the direct <br /> proximity of the remediation zone, have shown a one to two order of <br /> magnitude drop in hydrocarbon and oxygenate concentrations. At this <br /> point in time, the ozone sparging operation appears to be an effective <br /> means of remediating the petroleum hydrocarbon and oxygenate <br /> compounds in the groundwater at the site. <br /> On behalf of the property owner, and our client, we respectfully request a <br /> written authorization of the proposed remediation activities in the next 6 <br /> months. This letter will be used to gain Pre-Approval form the <br /> Underground Storage Tank Cleanup Fund of the costs for operation of the <br /> remediation system. <br /> Should you have any questions or comments, please' call us at (925) 820- <br /> 9391 . <br /> �NVIRONA9FlyT9 <br /> Respectfully submitted, <br /> AQUA SCIENCE ENGINEERS, INC. No.REA 06211 <br /> * Expires: 06-o4, <br /> r <br /> fir£OF CAl.1 � <br /> David Allen, R.E.A. <br /> Senior Project Manager �QD GES <br /> 4oF CA`�F4 <br /> Robert E. Kitay, R.G., R.E.A. <br /> Senior Geologist <br /> r <br /> cc: Mr. Satnam Singh, Responsible Party <br /> Singh's Unocal 'System Second Six Month's Operation Report — September 2003 <br /> -4- <br />