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Advanced <br /> GeoEnvironmental , Inc . 7::- <br /> Regarding ATC permit M N-7738-1-0 <br /> Issuance Date: 08/23/07 <br /> Location: 4407 E. Waterloo Road, Stockton, CA <br /> The above referenced permit is in need of modification due to the excessive cost of supplying the <br /> ECAT 250 with electrical service. The new soil vapor extraction system will need to be a <br /> catalytic oxidizer supplied by propane gas. The new unit is manufactured by Solleco and the <br /> model name is "TCAT 250." <br /> In addition, after concentrations fall below 200 ppmv, we will transition to granulated activated <br /> carbon (GAC)vessels. We anticipate concentrations will fall below the 200 ppmv threshold in <br /> approximately 6 to 12 months of continuous catalytic oxidizer operation. <br /> The following items are included with this letter: a permit application for ATC-Modification; a <br /> supplemental application form; a copy of the existing ATC requiring modification; MAT 250 <br /> technical specifications; and a check for$65. <br /> If you should have any questions or concerns,please do not hesitate to contact me at(209)467- <br /> 1006. <br /> Ally L. Colavita Date <br /> Advanced GeoEnvironmental, Inc. <br /> Staff Scientist <br /> 837 Shaw Road,Stockton,California 95215 <br /> Telephone (209)467-1006 Fax (209)467-1118 <br />