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} <br /> IarV15 Drive <br /> 4D— Sequoia Morgan n H"I CA 9503037 <br /> Analytical (408)7769608 <br /> FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project BP Heritage#I 1191,Stockton,CA MOG0813 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WW-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/05/05 14 59 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 5G29006-EPA 5030E P/T/EPA 8260B <br /> Laboratory Control Sample(54S29006-BSI) Prepared&Analyzed 07/29/05 <br /> tert-Amyl methyl ether 104 050 ugA 100 104 80-115 <br /> Benzene 11 1 050 100 111 65-115 <br /> tent-Butyl alcohol 464 20 500 93 75-150 <br /> Di-isopropyl ether 100 050 100 100 75-125 <br /> Ethanol 164 100 200 82 70-135 <br /> Ethyl tert-butyl ether 100 050 100 100 75-130 <br /> Ethylbenzene 9 13 050 100 91 75-135 <br /> Methyl tert-butyl ether 107 050 100 107 65-125 <br /> Toluene 118 050 100 118 85-120 <br /> Xylenes(total) 277 050 300 92 85-125 <br /> Surrogate 11-Dichloroethane-d4 154 150 101 60-135 <br /> AlMkLaboratory Control Sample(5G29006-BS2) Prepared&Analyzed 07/29/05 <br /> Benzene 621 050 ugA 608 102 65-115 <br /> Ethylbenzene 746 050 784 95 75-135 <br /> Methyl tert-butyl ether 935 050 960 97 65-125 <br /> Toluene 390 050 329 119 85-120 <br /> Xylenes(total) 363 050 38 5 94 85-125 <br /> Gasoline Range Organics(C4-C12) 488 50 440 111 70-124 <br /> Surrogate 12-Dichloroethane-d4 158 150 103 60-135 <br /> Laboratory Control Sample Dup(5G29006-BSD2) Prepared&Analyzed 07/29/05 <br /> Benzene 581 050 ug/1 608 96 65-115 7 20 <br /> Ethylbenzene 686 050 7 84 88 75-135 8 15 <br /> Methyl tert-butyl ether 953 050 960 99 65-125 2 20 <br /> Toluene 35 9 050 329 109 85-120 9 20 <br /> Xylenes(total) 340 050 38 5 88 85-125 7 20 <br /> Gasoline Range Organics(C4-C 12) 433 50 440 98 70-124 12 20 <br /> Surrogate 11-Dichloroethane-d4 131 150 92 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wee weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 12 <br />