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10/25/2004 16:33 209570x916 <br />GEO <br />GeoAnalytical Laboratories, Inc. <br />1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br />Report# Q289-01 QC REPORT <br />San Joaquin County Environmental Health <br />304 E. Weber 3rd Floor <br />Stockton CA 95202 <br />Dates Analyzed 10/18/04 <br />PAGE 24/26 <br />LCS <br />MS % <br />MSD % <br />RPD Blank <br />Batch # <br />Method %Recovery <br />Recovery <br />Recovery <br />Analyte <br />MTBE V00386 <br />8260B 97.7 <br />21.0 <br />240.0 <br />167.8 ND <br />3.6 ND <br />1,1-Dichlorothane <br />116.0 <br />114.0 <br />109.0 <br />106.0 <br />113.0 <br />110.0 <br />3.7 ND <br />Benzene <br />113.0 <br />111.0 <br />113.0 <br />1.8 ND <br />Trichloroethene <br />112.0 <br />105.0 <br />108.0 <br />2.8 ND . <br />Toluene <br />109.0 <br />98.9 <br />106.0 <br />6.9 ND <br />Chlorobenzene <br />Comments: <br />MTBE spike analyte is outside stated control limits, LCS within limits <br />lari <br />Donna Keller <br />'Onofrio <br />Chemist <br />Certification # 1157 <br />Laboratory Director <br />