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1455 McDowell Blvd North Ste <br /> + <br /> Sequoia a Petaluma,CA 949544 <br /> `1 (707)792-1865 <br /> FAX 342 <br /> Analytical wwsequ7 alabs om <br /> « www sequoia[abs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 45 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> nalyte Result Limit Units Level Result %REC Limits RPD Linut Notes <br /> Batch 3090663-EPA 5030 waters <br /> Blank(3090663-BLKI) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibrotnoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tent-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> arrogate Dibromofluoromethane 630 600 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 540 600 90 74-135 <br /> Surrogate Toluene-d8 617 600 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 588 600 98 86-119 <br /> Laboratory Control Sample(3090663-BSI) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether 4 58 10 ug/l 500 92 70-116 <br /> Benzene 506 050 500 101 81-118 <br /> Tert-butyl alcohol 118 20 100 118 62-142 <br /> Di-isopropyl ether 501 10 500 100 71-121 <br /> 1,2-Dibromoethane(EDB) 4 70 050 500 94 92-117 <br /> 1,2-Dtchloroethane 507 050 500 101 79-126 <br /> Ethanol 117 100 100 117 65-135 <br /> Ethylbenzene 4 71 050 500 94 89-122 <br /> Ethyl tert-butyl ether 492 10 500 98 71-110 <br /> Methyl tert-butyl ether 520 050 500 104 77-123 <br /> Toluene 505 050 500 101 84-119 <br /> Xylenes(total) 141 050 15 0 94 86-132 <br /> Surrogate Dibromofluoromethane 656 600 109 84-122 <br /> Surrogate 12-Dtchloroethane-d4 5 77 600 96 74-135 <br /> Surrogate Toluene-d8 633 600 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 589 600 98 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 in its entirety <br /> Page 12 of 15 <br />