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CHEMWEST ANALYTICAL LABORATORIES <br />HALOGENATED VOLATILE ORGANICS <br />EPA METHOD: 8010 <br />Quality Control <br />Client ID: NCS -4 EAST END <br />MS/MSD <br />CHEMWEST ID: <br />9501-QC2 <br />Date Analyzed: 04/28/92 <br />Matrix : Soil <br />Spike <br />% <br />% <br />Conc. <br />Recovery <br />Recovery <br />Compound <br />(MG/KG) <br />9501-2MS <br />9501-2MSD <br />RPD <br />---------------------------------------------------------------- <br />1,1-Dichloroethane <br />0.30 <br />103% <br />107% <br />4% <br />Chloroform <br />0.30 <br />130% <br />127% <br />2% <br />Trichloroethene <br />0.30 <br />100% <br />90% <br />11% <br />Bromodichloromethane <br />0.30 <br />100% <br />97% <br />3% <br />Tetrachloroethene <br />0.30 <br />80% <br />73% <br />9% <br />Chlorobenzene <br />0.30 <br />60% <br />50% <br />18% <br />1,2-Dibromoethane <br />------------------------------------------------------------------- <br />0.30 <br />130% <br />123% <br />6% <br />Spike <br />% <br />% <br />Conc. <br />Recovery <br />Recovery <br />Surrogates <br />(G/KG) <br />9501-2MS <br />9501-2MSD <br />---------------------------------------------------------------- <br />Bromochlorometane <br />10 <br />71% <br />74% <br />ortho-Chlorotoluene <br />20 <br />11% X <br />27% X <br />X : Matrix Interference, See Case Narrative <br />bi <br />Date Reported: <br />Approved by: 40 04/30/92 <br />COMPUCHEM WESTERN DIVISION <br />REV4.1.90 <br />