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B Laboratories, Inc <br /> i <br /> TRC Alton Geoscience Project 08671 <br /> 21 Technology Drive Project Number [none] <br /> Irvine CA,92618-2302 Project Manager Anju Farfan Reported 09/01/05 12 24 <br /> Volatile Organic Analysis (EPA Method 8264) <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 BOH1370 BOH1370-BS1 LCS 28 500 25 000 050 uglL 114 70-130 <br /> Toluene BOH1370 BOH1370-BS1 LCS 27 430 25 000 0 50 ug1L 110 70-130 <br /> 1 2-Dichloroethane-d4(Surrogate) BOH1370 BOH1370-BS1 LCS 99000 10 000 ug1L 99 0 76-114 <br /> Toluene-dB(Surrogate) BOH1370 BOH1370-BS1 LCS 10 110 10 000 ug/L 101 88-110 <br /> 4-Bromofluorobenzene(Surrogate) BOH1370 BOH1370-BSI LCS 95800 10 000 uglL 958 86-115 <br /> Benzene BOH1411 BOH1411-BS1 LCS 26190 25 000 050 ug1L 105 70-130 <br /> Toluene BOH1411 BOH1411-BS1 LCS 26 320 25 000 050 uglL 105 70-130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOH1411 BOH1411-BS1 LCS 98100 10 000 ug1L 981 _ 76-114 <br /> Toluene-d8(Surrogate) BOH1411 B0H%11-BS1 LCS 10 090 10 000 ug/l 101 88-110 _ �- <br /> 4-Bromofluorobenzene(Surrogate) BOH1411 BOH1411-BS1 LCS 97100 10 000 ug1L 971 86-115 <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 analytical report must be reproduced in its entirety <br /> All results listed in this report are for the exclusive use of the submitting party BC laboratories Inc assumes no responsibility For report alteration separation detachment or third parry inierpretation <br /> 4100 Atlas Court- Bakersfield,CA 93308-(661)327-4911 -FAX(661)327-1918 0 www bciabs corn Page 14 of 17 <br />