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BC'' <br /> Laboratories, Inc <br /> TRC Alton Geoscience Project: 11195 <br /> 21 Technology Drive Project dumber: [none] <br /> Irvine CA,92618-2302 Project Manager: Anju F'arfan Reported: 10/13/05 15:57 <br /> Volatile Organic Analysis (EPA Method 8260) <br /> Quality Control Report - Laboratory Control Sample <br /> Control Limits <br /> Spike Percent Percent <br /> Constituent Batch ID QC Sample ID QC Type Result Level PQL Units Recovery RPD Recovery RPD Lab Quals <br /> Benzene B010066 B010066-BS1 LCS 28.010 25.000 0.50 ug/L 112 70-130 <br /> Toluene B010066 8010066-BS1 LCS 27.060 25.000 0.50 ug/L 108 70- 130 <br /> 1,2-Dichloroethane-d4(Surrogate) 8010066 B010066-BS1 LCS 9.7500 10.000 ugIL 97.5 76-114 <br /> Toluene-d8(Surrogate) 8010066 B010066-BS1 LCS 10.110 10.000 uglL 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) B010066 B010066-BS1 LCS 9.9100 10.000 ug/L 99.1 86- 115 <br /> Benzene B010100 B010100-BSI LCS 28.100 25.000 0.50 ug/L 112 70-130 <br /> Toluene B010100 B010100-BS1 LCS 27.730 25.000 0.50 ug/L 111 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) 8010100 B010100-131SI LCS 9.6900 10.000 ug/L 96.9 76-114 <br /> Toluene-d8(Surrogate) B010100 8010100-BS1 LCS 10.230 10.000 ug1L 102 88-110 <br /> 4-Bromofluorobenzene(Surrogate) 6010100 6010100-BS1 LCS 9.8200 10.000 ug/L 98.2 86-115 <br /> BC Laboratories The resulls in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must he reproduced in its entirety. <br /> All results listed in this report arc for the exclusive use of the submitting parry. 13C Laboratories.Inc.assumes no responsibility for report alteration.separarion,detachment or third parry interpretation. <br /> 4100 Arlas C mirt•Rakersfirld_CA 93308• (66 1) 327-4911 •FAX(661)327-1918•www.bclabs.com Page 28 of 31 <br />