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Blvd, <br /> + 1455 McDowell alum North Ste 4 <br /> a— ) Sequoia Petaluma CA 94954 <br /> ► Analytical (707)792 <br /> FAX 707 792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 30 <br /> Volatile Organic Compounds by EPA Method 8260B-Quahty Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4040616-EPA 5030 soils ^� b <br /> Matrix Spike(4040616-MS1) Source P404402-04 V Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether 0 046 0050 mg/kg 0 0500 ND 93 74-126 <br /> Benzene 0 0443 0 0050 0 0500 ND 89 75-123 <br /> Tert-butyl alcohol 0 840 0 10 1 00 ND 84 66-129 <br /> Di-isopropyl ether 0 0467 0 0050 0 0500 ND 93 71-127 <br /> 1,2-Dtbromoethane(EDB) 00471 0 0050 0 0500 ND 94 88-118 <br /> 1,2-Dichloroethane 00473 0 0050 0 0500 ND 95 79-119 <br /> Ethanol 0 657 020 1 00 ND 66 70-140 QM02 <br /> Ethylbenzene 00449 0 0050 0 0500 ND 90 65-135 <br /> Ethyl cert-butyl ether 00469 0 0050 0 0500 ND 94 72-123 <br /> Methyl tert-butyl ether 0 0454 0 0050 0 0500 ND 91 70-125 <br /> Toluene 00416 0 0050 0 0500 ND 83 76-123 <br /> 0rrogate Drbromofluorom ethane 00501 00500 100 81-126 <br /> rrogate 12-Dichloroethane-d4 00487 00500 97 73-131 <br /> Surrogate Toluene-d8 00533 00500 107 82-129 <br /> Matrix Spike Dup(4040616-MSDI) Source P404402-04 Prepared&Analyzed 04/24/04 <br /> Tert-amyl methyl ether 0 0468 0 0050 mg/kg 00500 ND 94 74-126 0 4 35 - <br /> Benzene 0 0428 0 0050 00500 ND 86 75-123 3 35 <br /> Tert-butyl alcohol 0 835 0 10 1 00 ND 84 66-129 0 6 35 <br /> Di-isopropyl ether 0 0465 0 0050 00500 ND 93 71-127 0 4 35 <br /> 1,2-Dtbromoethane(EDB) 0 0470 0 0050 00500 ND 94 88-118 0 2 35 <br /> 1,2-Dtchloroethane 0 0462 0 0050 00500 ND 92 79-119 2 35 <br /> Ethanol 0 603 0 20 1 00 ND 60 70-140 9 35 QM02 <br /> Ethylbenzene 0 0429 0 0050 00500 ND 86 65-135 5 35 <br /> Ethyl tert-butyl ether 0 0486 0 0050 0 0500 ND 97 72-123 4 35 <br /> Methyl tert-butyl ether 0 0474 0 0050 00500 ND 95 70-125 4 35 <br /> Toluene 0 0394 0 0050 00500 ND 79 76-123 5 35 <br /> Surrogate Di bromofluorom ethane 00521 00500 104 81-126 <br /> Surrogate 12-Dichloroethane-d4 00510 " 00500 102 73-131 <br /> Surrogate Toluene-d8 00529 00500 106 82-129 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 11 of 12 <br />