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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> . ► Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P3I2737 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/0419 10 <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 4010065-EPA 5030B waters <br /> Blank(4010065-BLK1) Prepared&Anal zed 01/07/04 <br /> Teri-amyl methyl ether ND 1 0 ug11 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl Cert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> • Surrogate Dibrom ofluorom ethane 626 ,I 6 00 104 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 06 600 Jul 74-135 <br /> Surrogate Toluene-d8 6 13 600 102 84-119 <br /> Laboratory Control Sample(4010065-RSI) Prepared&Analyzed 01/07/04 <br /> Teri-amyl methyl ether 4 90 1 0 ug/l 5 00 98 78-117 <br /> Benzene 5 03 0 50 5 00 101 81-118 <br /> Tert-butyl alcohol 103 20 100 103 60-147 <br /> Di-isopropyl ether 5 33 1 0 5 00 107 70-125 <br /> Ethanol 102 100 100 102 55-200 <br /> Fthylbenzene 5 19 050 500 104 89-122 <br /> Ethyl tert-butyl ether 4 94 1 0 5 00 99 71-120 <br /> Methyl Cert-butyl ether 5 01 050 5 00 100 70-122 <br /> Toluene 5 02 050 5 00 100 84-119 <br /> Xylenes(total) 15 9 050 15 0 106 86-132 <br /> Surrogate Dibrom ofluorom ethane 6 51 6 00 108 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 630 600 105 74-135 <br /> Surrogate Toluene-d8 6 01 600 100 84-119 <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 slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />