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� Page 3 <br /> November 7, 2003 <br /> maximum detected concentration was consistently TBA. TBA was first detected at the former <br /> ExxonMobil site in March 2002, which is 7 years after Exxon Mobil sold the property. These facts, <br /> coupled with the recent increases in MTBE and TBA concentrations in VEW3 in 2002 and 2003, the <br /> failed UST tracer test performed at the site in April 2003, and ExxonMobil selling the property 8 years <br /> ago, are sufficient to exclude ExxonMobil from this issue. <br /> During the meeting and in prior communications, the City of Stockton requested technical advice <br /> regarding treatment of the contaminated water currently being stored in aboveground tanks along <br /> Plymouth Road. Based upon the information shared by the City, ExxonMobil's consultant ETIC <br /> Engineering, Inc. estimates that approximately 2,000 pounds of liquid phase carbon would be needed <br /> to treat the MTBE and TBA in the stored water. This calculation is based on the volume of water and <br /> analytical results supplied by the City of Stockton during the meeting. Additional carbon may be <br /> required should more soluble compounds such as ethanol or methanol be found in the water stored in <br /> the tanks. <br /> If you have any questions or comments,please contact me at 510.547.8196. <br /> Sincerely, <br /> Jennifer C. Sedlachek <br /> Project Manager <br /> Attachment: Graphs <br /> c: w1 attachment: <br /> Mr.David Wood-Condor Earth Technologies <br /> Ms.Terry Brazell-SWRCB <br /> Mr.Michael Infuina-SJCEHD <br /> c: w/o attachment: <br /> Mr.Joseph Muehleck-ETIC Engineering,Inc. <br />