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.i <br /> 1455 McDowell Blvd,North Ste D <br /> YA ' Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707) 2 <br /> www sequoialabs labs co com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elatth 10/16/03 11 59 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lurui Units Level Result %REC Linuts RPD Lint Notes <br /> Batch 3100129-EPA 5030 waters <br /> Laboratory Control Sample(3100129-BSI) Prepared&Analyzed 10/07/03 <br /> Tert-amyl methyl ether 426 10 ug/1 500 85 70-116 <br /> Benzene 5 17 050 500 103 81-118 <br /> Tert-butyl alcohol 111 20 100 111 62-142 <br /> Di-isopropyl ether 448 10 500 90 71-121 <br /> Ethanol 196 100 100 196 65-135 Q-29 <br /> Ethylbenzene 539 050 500 108 89-122 <br /> Ethyl tert-butyl ether 419 10 500 84 71-110 <br /> Methyl tert-butyl ether 417 050 500 83 77-123 <br /> Toluene 532 050 500 106 84-119 <br /> Xylenes(total) 16 2 050 15 0 108 86-132 <br /> Surrogate Dibromofluoromethane 441 450 98 84-122 <br /> Surrogate 12 Dichloroethane-d4 3 82 450 85 74-735 <br /> WUrrogate Toluene d8 464 450 103 84-119 <br /> Laboratory Control Sample Dup(3100729-BSDI) Prepared&Analyzed 10/07/03 <br /> Tert-amyl methyl ether 427 10 ug/1 500 85 70-116 0 2 20 <br /> Benzene 503 050 500 101 81-118 3 20 <br /> Teri-butyl alcohol 108 20 100 108 62-142 3 20 <br /> Di-isopropyl ether 440 to 500 88 71-121 2 20 <br /> Ethanol 180 100 100 180 65-135 9 20 Q-29 <br /> Ethylbenzene 520 050 5 00 104 89-122 4 20 <br /> Ethyl tert-butyl ether 4 17 10 500 83 71-110 0 5 20 <br /> Methyl tett-butyl ether 408 050 500 82 77-123 2 20 <br /> Toluene 5 18 050 500 104 84-119 3 20 <br /> Xylenes(total) 15 3 050 15 0 102 86-132 6 20 <br /> Surrogate Dibromofluoromethane 431 450 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 3 73 450 83 74-135 <br /> Surrogate Toluene d8 459 450 102 84-119 <br /> Sequoia 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 /> This analytical report must be reproduced in its entirety <br /> Page 25 of 30 <br />