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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 950375037 <br /> 41) <br /> (408)776-9600 <br /> Iwo Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> • <br /> URS Corporation [Arco 11 Project ARCO#5469, Stockton,CA MPC0315 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/30/06 14 47 <br /> Volatile Organic Compounds by EPA Method 8260H - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %RSC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6C20002- EPA 5030E P/T/EPA 8260B <br /> Blank(6C20002-BLK1) Prepared&Analyzed 03/20/06 <br /> tert-Amyl methyl ether ND 050 ugll <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> I 2-Dibromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 050 " <br /> Ethanol ND 300 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> fes(total) ND 050 <br /> me Range Organics(C4-C 12) ND 50 <br /> Surrogate 1 2-Dichloroethane-d4 489 500 98 60-135 <br /> Surrogate Toluene-d8 524 500 105 70-120 <br /> Surrogate Dibromofluoromethane 507 500 101 65-130 <br /> Surrogate 4-Bromofluoroben_ene 494 500 99 70-120 <br /> Laboratory Control Sample(6C20002-BS1) Prepared&Analyzed 03/20/06 <br /> tert-Amyl methyl ether 146 050 ugA 163 90 80-115 <br /> Benzene 505 050 504 100 65-115 <br /> tent-Butyl alcohol 147 20 169 87 75-150 <br /> Di-isopropyl ether 15 6 050 16 2 96 75-125 <br /> 1 2-Dibromoethane(EDB) 15 3 050 16 6 92 85-120 <br /> 1 2-Dichloroethane 14 9 050 155 96 85-130 <br /> Ethanol 133 300 165 81 70-135 <br /> Ethyl tert-butyl ether 15 3 050 16 4 93 75-130 <br /> Ethylbenzene 750 050 728 103 75-135 <br /> Methyl tert-butyl ether 726 050 7 84 93 65-125 <br /> Toluene 31 3 050 380 82 85-120 I-IM <br /> Xylenes(total) 41 4 050 408 101 85-125 <br /> Gasoline Range Organics(C4-C 12) 398 50 440 90 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 458 500 92 60-135 <br /> Surrogate Toluene-d8 499 500 100 70-120 <br /> Surrogate Dibromofluoromethane 469 500 94 65-130 <br /> Surrogate 4-Bromofluoroberz.ene 504 500 101 70-120 <br /> uota Analytical- Morgan H111 The results in this report apply to the samples analy_ed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a we/weight basis <br /> This analytical report must be reproduced in its entirely <br /> Page 23 of 29 <br />