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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. M <br /> r <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 from th e <br /> Underground Storage`Tank Cleariup 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 /> Respectfully submitted, <br /> AQUA SCIENCE ENGINEERS,INC. Vo.REA-06211 <br /> Expires: (%` ° <br /> I <br /> OF CAt-1Fo �Q { <br /> avid Allen, R.E.A. <br /> Senior Project Manager `LD GF ' <br /> E. 0,� <br /> >�cUF <br /> CA`\FpQ' <br /> Robert E. Kitay, R.G., R.E.A. <br /> Senior Geologist <br /> I <br /> cc: Mr. Satnam Singh, Responsible Party <br /> 3 <br /> Singh's Unocal System Second Six Month's Operation Report — September 2003 <br /> -4- <br /> I <br /> i <br />