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1455 McDowell Blvd,North Ste D <br /> a— ) Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 16 58 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source hREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3100060-EPA 5030 waters <br /> Laboratory Control Sample(3100060-BSI) Prepared 10/02/03 Analyzed 10/03/03 <br /> Tert-amyl methyl ether 479 10 ug/l 500 96 70-116 <br /> Benzene 564 050 500 113 81-118 <br /> Tert-butyl alcohol 148 20 100 148 62-142 Q-29 <br /> Dr-isopropyl ether 530 10 500 106 71-121 <br /> Ethanol 139 100 100 139 65-135 Q-29 <br /> Ethylbenzene 546 050 500 109 89-122 <br /> Ethyl tent-butyl ether 514 10 500 103 7I-110 <br /> Methyl tert-butyl ether 520 050 500 104 77-123 <br /> Toluene 602 050 500 120 84-119 Q-LIM <br /> Xylenes(total) 171 050 150 114 86-132 <br /> I <br /> Surrogate Dibromofluoromethane 616 " 600 103 84-121 <br /> OSurrogate 12-Dichloroethane-d4 510 600 87 74-135 <br /> urrogate Toluene d8 633 600 106 84-119 <br /> Laboratory Control Sample Dup(3100060-BSD1) Prepared 10/02/03 Analyzed 10/03/03 <br /> Tert-amyl methyl ether 484 10 ug/1 500 97 70-116 1 20 <br /> Benzene 564 050 500 113 81-118 0 20 <br /> Tert-butyl alcohol 154 20 too 154 62-142 4 20 Q-29 <br /> Di-isopropyl ether 529 to 500 106 71-121 02 20 <br /> Ethanol 183 100 100 183 65-135 27 20 Q-29 <br /> Fthylbenzene 558 050 500 112 89-122 2 20 <br /> Ethyl tert-butyl ether 523 10 500 105 71-110 2 20 <br /> Methyl tert-butyl ether 538 050 500 108 77-123 3 20 <br /> Toluene 610 050 500 122 84-119 1 20 Q-LIM <br /> Xylenes(total) 169 050 150 113 86-132 1 20 <br /> Surrogate DibromoJluoromethane 617 600 103 84-121 <br /> Surrogate 12-Dichloroethane-d4 537 600 90 74-135 <br /> Surrogate Toluene-d8 627 600 104 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 /> Tins analytical report must be reproduced in its entirety <br /> Page 15 of 16 <br />