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1455 McDowell Blvd,NorthSte D <br /> Sequoia Petaluma, <br /> CAA 94934 <br /> a— —N (707)792-1865 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/25/03 17 01 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Linut Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3060579-EPA 5030 waters <br /> Blank(3060579-BLK1) Prepared&Analyzed 06/23/03 <br /> Tent-amyl methyl ether ND 10 ugll <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND ]Do " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 500 500 100 84-111 <br /> Surrogate 12-Dichloroethane-d4 439 500 88 74-135 <br /> Surrogate Toluene-d8 481 500 96 84-119 <br /> Laboratory Control Sample(3060579-BSI) Prepared 06/23/03 Analyzed 06/24/03 <br /> Tert-amyl methyl ether 486 1 0 ugll 500 97 70-116 <br /> ert butyl alcohol 976 20 „ 100 98 62-142 <br /> iasopropyl ether 449 10 500 90 71-121 <br /> Ethyl tent-butyl ether 444 10 Soo 89 71-110 <br /> Methyl lert butyl ether 465 050 500 93 77-123 <br /> I <br /> Surrogate Dibromofluoromethane 484 500 97 84-112 <br /> Surrogate 11-Diehloroethane-d4 453 500 91 74-135 <br /> Surrogate Toluene-d8 486 " 500 97 84-119 <br /> Matrix Spike(3060579-MSI) Source P306157-11 Prepared 06/23/03 Analyzed 06/24/03 HT-04 <br /> Tert-amyl methyl ether 467 10 uel Soo ND 93 70-116 <br /> Tert-butyl alcohol 835 20 100 ND 84 62-142 <br /> Di-isopropyl ether 416 1 0 500 ND 83 71-121 <br /> Ethyl tent-butyl ether 412 1 0 Soo ND 82 71-110 <br /> Methyl tert-butyl ether 460 050 500 036 85 77-123 <br /> Surrogate Dibromofluoromethane 444 500 89 84-111 <br /> Surrogate 1 2-Dichloroethane-d4 408 500 81 74-135 <br /> Surrogate Toluene-d8 499 " 500 100 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 bas's <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 12 <br />