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BC Laboratories, Inc r <br /> TRC Alton Geoscience Project 11192 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 09/12/05 14 35 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Sample Type Result Result Added Units RPD Recovery RPD Recove Lab Quals <br /> Benzene 6010046 8010046-MS1 Matrix Spike ND 23 930 25 000 uglL 957 70 130 <br /> BW046-MSD1 Matrix Spike Duplicate ND 22 400 25 000 uglL 658 896 20 70-130 <br /> To3uene B010046 6010046-MS1 Matrix Spike ND 24 850 25 000 uglL 99 4 70- 130 <br /> B010046-MSD1 Matrix Spfke Duplicate ND 24 340 25 000 uglL 203 974 20 70- 130 <br /> 1 2-Dichloroethane-d4(Surrogate) B010046 8010046-MS1 Matrix Spike ND 99700 10 000 uglL 997 76- 114 <br /> 8010046-MSDi Matrix Spike Duplicate ND 91800 10 000 ug/L 91 8 76-114 <br /> Toluene-d8(Surrogate) B010046 B010046-MS1 Matrix Spike ND 95800 10 000 ug1L 958 88-110 <br /> BOM046-MSD1 Matrix Spike Duplicate ND 94300 10 000 uglL 94 3 88-110 <br /> 4 Brornofluorobenzene(Surrogate) B010046 B010046-MS1 Matrix Spike ND 9 1200 10 000 uglL 91 2 86- 115 <br /> B010046-MSD1 Matrix Spike Duplicate ND 90500 10 000 uglL 90 5 86- 115 <br /> Benzene 8010244 BOt0244-MS1 Matrix Spike ND 17 820 25 000 ug/L 71 3 70- 130 <br /> B010244-MSD1 Matrix Spike Duplicate ND 17 560 25 000 uglL 1 55 702 20 70- 130 <br /> Toluene 8010244 B010244-MS1 Matri> Spike ND 21 620 25 000 ug/L 865 70-130 <br /> B010244-MSD1 Matrix Spike Duplicate ND 21 390 25 000 uglL 1 05 856 20 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) 8010244 8010244-MS1 Matrix Spike ND 10 210 10 000 uglL 102 76-114 <br /> 6010244-MSD1 Matrix Spike Duplicate ND 10 110 10 000 ug1L 101 76 114 <br /> Toluene-d8(Surrogate) 13010244 B010244-MSI Matrix Spike ND 98700 10 000 uglL 987 88- 110 <br /> B010244-MSD1 Matrix Spike Duplicate ND 92400 10 000 uglL 924 88-110 <br /> 4-Bromofluorobenzene(Surrogate) B010244 B010244-MS1 Matrix Spike ND 10 090 10 000 uglL 101 86-115 <br /> 6010244-MSD1 Matrix Spike Duplicate ND 95700 10 000 uglL 957 85-115 <br /> I <br /> i <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document This analylical report must be reproduced in its entirety <br /> All results bsted in this reporr are for the exclusive use of rhe submitting parry 13C Laboratories Inc assumes no responsibility for report atterauon separation detachment or thud parry interpretation <br /> 4100 Atlas Court• Bakersfield,CA 93308• (661) 327-4911 • FAX(661)327-1918•wwwbelabs com Page 9 of 12 <br /> I <br />