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GeoAnalytical Laboratories, Inc. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />• Report# P258-13 QC REPORT <br />Foothill Engineering <br />12793 Paddy Creek Lane <br />Lodi CA 95240 <br />Analyte Batch # <br />Methyl tertiary -Butyl Ether V00379 <br />Di -isopropyl Ether (DIPE) <br />Benzene <br />1,2-Dichloroethane (1,2 -DCA) <br />tertiary -Amyl Methyl Ether <br />Toluene <br />• <br />Dates Analyzed 09/18/03 <br />LCS <br />MS % <br />MSD % <br />RPD <br />Blank <br />Method %Recovery <br />Recovery <br />Recovery <br />8260E 86.9 <br />115.0 <br />94.6 <br />19.5 <br />ND <br />89.0 <br />109.0 <br />98.1 <br />10.5 <br />ND <br />91.2 <br />97.9 <br />98.0 <br />0.1 <br />ND <br />99.0 <br />115.0 <br />104.0 <br />10.0 <br />ND <br />87.5 <br />102.0 <br />91.8 <br />10.5 <br />ND <br />89.0 <br />97.3 <br />93.2 <br />4.3 <br />ND <br />. Comments:.:_ _ . . __.. _ ... .... ........ ..... . <br />guio <br />'On rio <br />Chemist <br />Certification # 1157 <br />P'�" /""� <br />Donna Keller <br />Laboratory Director <br />