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.ti <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792 1865 <br /> 42 <br /> Analytical FAXequin labsc m <br /> www sequoialahs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080132-EPA 5030 waters <br /> Laboratory Control Sample(3080132-BSI) Prepared&Analyzed 08/07/03 <br /> Tert-amyl methyl ether 515 10 ug/l 500 103 70 116 <br /> Benzene 558 050 500 112 81-118 <br /> Tert-butyl alcohol 104 20 " 100 104 62-142 <br /> Di-isopropyl ether 5 33 to " 500 107 71-121 <br /> 1,2-Dibromoethane(EDB) 571 050 " 500 114 92-117 <br /> 1,2-Diehloroethane 551 050 1500 110 79-126 <br /> Ethyl tert-butyl ether 505 10 500 101 71-110 <br /> Methyl tert butyl ether 517 050 " 500 103 77-123 <br /> Toluene 526 050 " 500 105 84-119 <br /> Surrogate Dibromofluoromethane 481 " 450 107 84-111 <br /> Surrogate 12-Dichloroethane-d4 468 " 450 104 74-135 <br /> W <br /> rragate Toluene-d8 4 73 450 105 84-119 <br /> rrogate 4-Bromofluorobenzene 482 1450 107 86-119 <br /> Laboratory Control Sample Dup(3080132-BSDI) Prepared&Analyzed 08/07/03 <br /> 'Pert-amyl methyl ether 558 10 ug/l 500 112 70-116 8 20 <br /> Benzene 576 050 500 115 81-119 3 20 <br /> Teri-butyl alcohol 959 20 1t00 96 62-142 8 20 <br /> Di-isopropyl ether 557 1 0 5 00 111 71-121 4 20 <br /> 1,2-Dibromoethane(EDB) 599 050 " 500 120 92-117 5 20 Q-LIM <br /> 1,2-Dichloroethane 569 050 11500 114 79-126 3 20 <br /> Ethyl tert-butyl ether 544 10 500 109 71-110 7 20 <br /> Methyl tent-butyl ether 555 050 500 111 77-123 7 20 <br /> Toluene 547 050 500 109 84-119 4 20 <br /> Surrogate Dibromofluoromethane 497 450 110 84-111 <br /> Surrogate 12-Dichloroethane-d4 492 450 109 74-135 <br /> Surrogate Toluene-d8 492 450 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 486 450 108 86-119 <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 to its entirety <br /> Page 15 of 19 <br />