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a 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> r Analytical FAX(707)7920342 <br /> WWW sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Litrat Units Level Result %REC Lirruts RPD Lumt Notes <br /> Batch 3060535-EPA 5030 waters <br /> Blank(3060535-ELKI) Prepared&Analyzed 06/21/03 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 4 70 450 104 84-122 <br /> Surrogate 12-Drchloroethane-d4 446 450 99 74-135 <br /> Surrogate Toluene d8 465 450 103 84-119 <br /> Laboratory Control Sample(3060535-BSI) Prepared&Analyzed 06/21/03 <br /> W-11-amyl methyl ether 495 10 uUO5 00 99 70-116 <br /> -butyl alcohol 106 20 " l0o 106 62-142 <br /> Di isopropyl ether 500 1 0 500 100 71-121 <br /> r-thyl tert-butyl ether 497 to Soo 99 71-110 <br /> Methyl tert-butyl ether 522 050 500 104 77-123 <br /> Surrogate Dibromofluoromethane 481 " 450 107 84-122 <br /> Surrogate 12-Drchloroethane-d4 444 450 99 74-135 <br /> Surrogate Toluene-d8 488 450 108 84-119 <br /> Laboratory Control Sample Dup(3060535-BSD1) Prepared&Analyzed 06/21/03 <br /> Tert-amyl methyl ether 493 10 ug/l 500 99 70-116 04 20 <br /> Tert-butyl alcohol 121 20 100 121 62-142 13 20 <br /> Di-isopropyl ether 505 10 500 101 7I-121 I 20 <br /> Ethyl tert-butyl ether 508 10 500 102 71-110 2 20 <br /> Methyl tert-butyl ether 5 19 050 500 104 77-123 06 20 <br /> Surrogate Dibromofluoromethane 481 450 107 84-122 <br /> Surrogate 11-Drchloroethane-d4 434 450 96 74-135 <br /> Surrogate Toluene-d8 464 450 103 84-119 <br /> equoia Analytical-Petaluma 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 wet weight basis <br /> Ars analytical report must be reproduced in its entirety <br /> Page 9 of 12 <br />