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97/21/2004 14:23 20957205 GEO <br />Ge©A,nalytical Laboratories, Inc. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />Report# Q184-08 QC REPORT <br />Thorpe Oil <br />PO Box 357 <br />Lodi <br />Analyte <br />Methyl tertiary -Butyl Ether <br />Di -isopropyl Ether (DTPE) <br />Benzene <br />tertiary -Amyl Methyl Ether <br />Toluene <br />Comments. <br />Matt Page <br />Chemist <br />CA 95241 <br />Batch # <br />V00239 <br />Dates Analyzed 6/2$/04 <br />Certification # 1157 <br />PAGE 12/15 <br />RPD Blank <br />2.9 ND <br />3.0 ND <br />1.9 ND <br />4.0 ND <br />9.6 NTD <br />12c,W, <br />Donna Keller <br />Laboratory Director <br />MSD /o <br />Method %Recovery <br />Recovery <br />over y <br />Recovery <br />8260B 126.5 <br />122.5 <br />119.0 <br />105.3 <br />105.0 <br />108.3 <br />102.8 <br />105.0 <br />103.0 <br />98.3 <br />102.8 <br />98.8 <br />100.5 <br />117.3 <br />106.5 <br />Certification # 1157 <br />PAGE 12/15 <br />RPD Blank <br />2.9 ND <br />3.0 ND <br />1.9 ND <br />4.0 ND <br />9.6 NTD <br />12c,W, <br />Donna Keller <br />Laboratory Director <br />