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GeoAnalytical Laboratories Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone(209)572-0900 Fax (209)572-0916 <br /> Report# K074-16 QC REPORT QC Batch# SV00090 <br /> Semco(Modesto) <br /> 1217 S 7th Street <br /> Modesto CA 95351 <br /> Dates Analyzed 3/19/99 <br /> Samples Analyzed: K20895,K20896 Sample Spiked: K20895 <br /> MS% MSD% RPD Blank <br /> Analyte Method Recovery Recovery <br /> 1,4-Dichlorobenzene 8270 71.2 70.0 1.7 ND <br /> n-Nitrosopropylamine 63.1 69.1 9.1 ND <br /> 1,2,4-Trichlorobenzene 67.0 70.0 4.4 ND <br /> Acenaphthene 68.8 70.3 2.2 ND <br /> 2,4-Dinitrotoluene 68.5 80.2 15.8 ND <br /> Pyrene 98.8 80.5 20.4 ND <br /> Phenol 69.2 71.6 3.4 ND <br /> 2-Chlorophenol 72.4 72.0 0.6 ND <br /> 4-Chloro-3-methylphenol 75.8 80.6 6.1 ND <br /> 4-Nitrophenol 52.2 84.8 47.6 ND <br /> Pentachlorophenol 87.2 100.8 14.5 ND <br /> Comments: <br /> A <br /> Gregory Merciadis Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />