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eff,manterra &MM=e0=1 se,ces ' DUPLICATE CONTROL SAMPLE REPORT Volatile Organics by GC/MS Project: 095091 Category: 8260-A 8260, Aqueous Testcode: 8260-TCL-LL-A q Method: 8260 Matrix: AQUEOUS Concentration Units: u /L QC Lot: 30 SEP 97-3A Analyzed Date: 30 SEP 97 Time: 12:56 ---Concentration-------- Accuracy Precision ' Analyte Spiked -------Measured----- M ( RPD) DCS1 DCS2 DCS1 DCS2 Limits DCS Limit I,I-Dichloroethene 10.0 10.6 10.3 106 103 75-113 2.9 20 Benzene 10.0 9.83 9.68 98 97 78-116 1.5 20 Trichloroethene 10.0 9.24 9.72 92 97 70-110 5.1 20 Toluene 10.0 9.58 9.21 96 92 78-126 3.9 20 ' Chlorobenzene 10.0 9.30 9.46 93 95 81-115 1.7 20 ---Concentration-------- ' Surrogate Spiked -------Measured----- Accuracy(%) OCS1 DCS2 DCS1 DCS2 Limits 1,2-Dichloroethane-d4 10.0 9.61 9.84 96 98 76-114 0Toluene-d8 10.0 9.63 9.78 96 98 88-110 4-Bromofluorobenzene 10.0 9.52 10.3 95 103 86-115 Category: 8260-A 8260, Aqueous Testcode. 8260-TCL-LL-A Method: 8260 Matrix: AQUEOUS Concentration Units: ug/L QC Lot: 01 OCT 97-3A Analyzed Date: 01 OCT 97 Time: 13:59 ---------Concentration-------- Accuracy Precision Analyte Spiked -------Measured----- N (RPD) DCSI DCS2 DCS1 DCS2 Limits DCS Limit 1,1-Dichloroethene 10.0 10.7 10.6 107 106 75-113 0.93 20 Benzene 10.0 9.93 9.73 99 97 78-116 2.0 20 Trichloroethene 10.0 9.76 9.94 98 99 70-110 1.8 20 Toluene 10.0 9.73 9.46 97 95 78-126 2.7 20 Chlorobenzene 10.0 9.69 9.73 97 97 81-115 0.42 20 ---------Concentration-------- Surrogate Spiked -------Measured----- Accuracy f) OCS1 DCS2 DCS1 DC 2 Limits ' 1 ,2-Dichloroethane-d4 10.0 9.50 9. 13 95 91 76-114 Toluene-d8 10.0 9.96 9.50 100 95 88-110 ' 4-Bromofluorobenzene 10.0 9.90 9.67 99 97 86-115 Calculations are performed before rounding to avoid round-off errors in calculated results.