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kBC Laboratories, Inc <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 16 <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 10 QC Type Result Level PQL Units Recovery RPD Recovery RPD Lab Quaffs <br /> Benzene B010044 B010044 BS1 LCS 23 950 25 000 0 50 uglL 95 8 70- 130 <br /> Toluene B010044 B010044-BS1 LCS 24 780 25 000 0 50 uglL 991 70- 130 <br /> 1,2-Dichloroethane-d4(Surrogate) BOI0044 B010044 BS1 LCS 97100 10 000 uglL 97 1 76-114 <br /> Toluene-d8(Surrogate) B010044 B010044 BS1 LCS 99100 10 000 uglL 991 88-110 <br /> 4-Bromofluorobenzene(Surrogate) 8010044 BO10044-BSI LCS 94800 10 000 uglL 94 8 86 115 <br /> Benzene 8010046 B010046-BS1 LCS 23 130 25 000 0 50 uglL 925 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 uglL 951 76-114 <br /> Toluene d8(Surrogate) B010046 BOI0046-BS1 LCS 92400 10 000 uglL 924 88 110 <br /> 4-Bromofluorobenzene(Surrogate) BOI0046 B010046-BS1 LCS 92900 10 000 ug11_ 929 86-115 <br /> Benzene BO10244 B010244-B51 LCS 18 180 25 000 1 0 ug1L 727 70-130 <br /> Toluene B010244 8010244-BSI LCS 22 350 25 000 1 0 ug1L 894 70-130 <br /> 1 2-Dtchloroethane-d4(Surrogate) BOI0244 B010244-BSI LCS 11 150 10 000 uglL 112 76-114 <br /> Toluene-d8(Surrogate) BOI0244 B010244-BS1 LCS 10140 10 000 uglL 101 88- 110 <br /> 4-Bromofluorobenzene(Surrogate) 8010244 8010244-BS1 LCS 94700 10 000 uglL 94 7 86-115 <br /> BC Laboratories The results in this report apply to the samples analyzed in accordance with the chain of custody document This onalyt:cal report muss be reproduced in its entirery <br /> All results listed to this report are for the exclusive use of the submattng party BC laboratori es no responsibility for report alterarion,separation detachment or third pdrry interpretation <br /> 4100 Atlas Court•Bakersfield,CA 93308 0 (b 27-4911 • FAX(661)327-1918 •wwwbclabs com Page 19 of 22 <br />