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1 A55 McDow <br /> Sequoia Petaluma,CA 94954 <br /> ell Blvd North Ste <br /> 4z4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/18/05 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result °/uREC Limits RPD Lama Notes <br /> Batch 5010138-EPA 5030E waters/EPA 8260B <br /> Matrix Spike Dup(5010138-MSDI) Source P501061-09 Prepared&Analyzed 01/11/05 <br /> Tert-amyl methyl ether 524 10 ugh 500 ND 105 78-117 08 20 <br /> Benzene 5 30 050 500 ND 106 81-118 2 20 <br /> Tert-butyl alcohol 90 0 20 100 ND 90 60-147 4 20 <br /> Di-isopropyl ether 5 23 10 500 ND 105 70-125 0 8 20 <br /> 1,2-Dichloroethane 513 050 500 ND 103 77-126 1 20 <br /> Ethanol 104 100 100 ND 104 55-200 5 20 <br /> Ethylbenzene 521 050 500 ND 104 89-122 2 20 <br /> Ethyl tert-butyl ether 501 1 0 500 ND 100 71-120 0 8 20 <br /> Methyl tert butyl ether 767 050 5 00 2 5 103 70-122 2 20 <br /> Toluene 520 050 500 ND 104 84-119 2 20 <br /> Xylenes(total) 164 050 15 0 ND 109 86-132 2 20 <br /> Surrogate Drbromofluoromethane 5 06 500 101 84-122 <br /> Wurrogate 11-Drchloroelhane-d4 494 Soo 99 74-135 <br /> Surrogate Toluene-d8 543 500 109 84-119 <br /> Surrogate 4-Bromofluorobenzene 517 500 103 86-119 <br /> Batch 5010152-EPA 5030B waters/EPA 8260B <br /> Blank(5010152-BLK1) Prepared&Analyzed 01/12/05 <br /> Tert-amyl methyl ether ND 10 ugh <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <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 /> Surrogate Drbromofluoromethane 489 500 98 84-122 <br /> Surrogate 11-Drchloroelhane-d4 494 500 99 74-135 <br /> Surrogate Toluene-d8 517 5 00 105 84-119 <br /> Surrogate 4-Bromofluorobenzene 510 500 101 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 30 of 33 <br />