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DUPLICATE CONTROL SAMPLE REPORT <br />Volatile Organics by GC <br />Concentration Accuracy Precision <br />Analyte Spiked Measured Average(%) (RPD) <br />DCS1 DCS2 AVG DCS Limits DCS Limit <br />Category: <br />AQUEOUS <br />Q:Lot: 17 JUL 89-29B <br />Concentration Units: ug/L <br />1,1-Dichloroethane <br />5.0 <br />5.93 <br />5.69 <br />5.81 <br />116 <br />70-138 <br />4.1 <br />24 <br />Chloroform <br />5.0 <br />6.07 <br />5.74 <br />5.90 <br />118 <br />83-124 <br />5.6 <br />18 <br />Bromodichloromethane <br />10.0 <br />10.4 <br />9.61 <br />10.0 <br />100 <br />78-132 <br />7.9 <br />21 <br />Trichloroethene <br />5.0 <br />5.84 <br />5.75 <br />5.80 <br />116 <br />82-122 <br />1.6 <br />16 <br />Tetrachloroethene <br />5.0 <br />5.23 <br />5.21 <br />5.22 <br />104 <br />82-122 <br />0.4 <br />15 <br />Chlorobenzene <br />5.0 <br />5.61 <br />5.39 <br />5.50 <br />110 <br />80-126 <br />4.0 <br />19 <br />Category: 602-A <br />Matrix: AQUEOUS <br />QC Lot: 06 JUL 89-3A <br />Concentration Units: ug/L <br />Benzene <br />5.0 <br />4.60 <br />4.78 <br />4.69 <br />94 <br />82-112 <br />3.8 <br />11 <br />Toluene <br />5.0 <br />4.50 <br />4.61 <br />4.56 <br />91 <br />81-114 <br />2.4 <br />13 <br />1,3 -Dichlorobenzene <br />5.0 <br />4.56 <br />4.94 <br />4.75 <br />95 <br />68-124 <br />8.0 <br />13 <br />Chlorobenzene <br />5.0 <br />4.79 <br />4.96 <br />4.88 <br />98 <br />75-120 <br />3.5 <br />10 <br />10 <br />Ethyl benzene <br />5.0 <br />4.84 <br />4.77 <br />4.80 <br />96 <br />73-117 <br />1.5 <br />11 <br />Total xylenes <br />15.0 <br />14.5 <br />15.0 <br />14.8 <br />98 <br />75-120 <br />3.4 <br />10 <br />Calculations are performed before rounding to avoid round -off errors in calculated results. <br />r� <br />