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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792 1665 <br /> a_ _�►► Analytical FAX(707)7920342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/I8/05 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 %REC lamas RPD Limit Notes <br /> Batch 5010016-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dap(5010016-BSDI) Prepared&.Analyzed 01/03/05 <br /> Teri-amyl methyl ether 596 1 0 ug/1 500 119 7a-117 10 20 HL <br /> Benzene 664 050 500 133 81-118 14 20 HL <br /> Tert-butyl alcohol 118 20 100 118 60-147 31 20 BA <br /> Di-isopropyl ether 613 10 500 123 70-125 9 20 <br /> 1 2-Dichloroethanc 634 050 500 127 77-126 13 20 HL <br /> Ethanol 150 100 100 150 55-200 40 20 RB <br /> Ethylbenzene 642 050 500 128 89-122 10 20 HL <br /> Ethyl tert-butyl ether 565 1 0 504 113 71-120 6 20 <br /> Methyl tert-butyl ether 555 050 500 111 70-122 09 20 <br /> Toluene 648 050 Soo 130 84-119 12 20 HL <br /> Xylenes(total) 196 050 ]so 131 86-132 12 20 <br /> �Surrogate Dibromofluoromethane 459 Soo 92 84-I22 <br /> urrogate 12 Dichloroethane-d4 536 500 107 74-135 <br /> Surrogate Toluene d8 466 500 93 84-119 <br /> Surrogate 4-Bromo luorobenzene 468 500 94 86-119 <br /> Batch 5010022-EPA 5030B waters/EPA 8260B <br /> Blank(5010022-BLK1) Prepared&Analyzed 01/04/05 <br /> Tert-amyt methyl ether ND 10 ug/l <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND 1 0 " <br /> 1,2-Dichlotoethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibrornofluoromethane 453 5 00 91 84-121 <br /> Surrogate 12-Dichloroethane-d4 462 5 00 92 74-135 <br /> Surrogate Toluene-d8 5 15 5 00 103 84-119 <br /> Surrogate 4-Bromofluorobenzene 322 5 00 104 86-119 <br /> Sequoia Analytical-Petaluma The results to 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 23 of 33 <br />