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�BC Laboratories, Inc <br /> I <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 - 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 B010046 B010046-BS1 LCS 23 130 25 000 0 50 uglL 92 5 70-130 <br /> Toluene B010046 B010046-BS1 LCS 23 620 25 000 0 50 uglL 94 5 70- 130 <br /> 1,2-Dichloroethane d4(Surrogate) 8010046 B010046-BS1 LCS 95100 10 000 ug/L 951 76-114 <br /> Toluene-d8(Surrogate) B010046 B010046-BS1 LCS 92400 10 000 uglL 92 4 88-110 <br /> 4 Bromo€#uorobernzene(Surrogate) 6010046 B010046-BS 1 LCS 92900 10 000 uglL 929 86-115 <br /> Benzene B010244 B010244-BS1 LCS 18 180 25 000 1 0 uglL 72 7 70- 130 <br /> Toluene B010244 B010244-BS1 LCS 22 350 25 000 10 uglL 894 70- 130 <br /> _ I <br /> 1 2-Dichloroethane d4(Surrogate) BOM44 8010244-BS1 LCS 11 150 10 000 uglL 112 76-114 <br /> Toluene-d8(Surrogate) B010244 B010244-BS1 LCS 10140 10 000 ug/L 101 88- 110 <br /> 4-Bromofluorobenzene(Surrogate) B010244 B010244-BS1 LCS _ 94700 10 000 ug/L 94 7 86-115 <br /> BC Laboratories The results to this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in us Lnure4 <br /> All results listed in this report are for the exclusive use of the submtmng parry BC LaboratOrLeI1111hp.Lssurnes no responsibility for report alteration separation detachment or third pare imerpreranon - <br /> 4100 Atlas Court- Bakersfield,CA 93308-(67-4911 -FAX(661)327-1918-www bclabs com Page 10 of 12 <br />