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10/25/2004 16:33 20957^x^916 GEO <br />GeoAnalytical Laboratories, Inc. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />Report# Q299-01 QC REPORT <br />San Joaquin County Environmental Health <br />304 E. Weber 3rd Floor <br />Stockton CA 95202 <br />Analyte <br />MTBE <br />1,1-Dichloroethane <br />Benzene <br />Trichloroethene <br />Toluene <br />Chlorobenzene <br />Comments; <br />Lg& <br />Mano D Onofrio <br />Chemist <br />Dates Analyzed 10/18/04 <br />LCS <br />MS % <br />MSD % <br />Batch # Method %Recovery <br />Recovery <br />Recovery <br />V00385 8260B 97.8 <br />128.0 <br />106.3 <br />115.8 <br />112.0 <br />102.3 <br />114.0 <br />108.3 <br />100.0 <br />113.0 <br />128.0 <br />107.5 <br />112.5 <br />98.3 <br />94.3 <br />108.8 <br />96.5 <br />94.5 <br />Certification # 1157 <br />PAGE 23/26 <br />RPD Blank <br />18.6 ND <br />9.1 ND <br />7.9 ND <br />17.4 ND <br />4.2 ND <br />2.1 ND <br />Donna Keller <br />Laboratory Director <br />