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11 <br /> Seuo a 1455 McDowell vd, orth Ste D <br /> a n q uma,CA 94954 <br /> j (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www seyuoialabs cum <br /> I <br /> I <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intron-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporung Spike Source %REC RPD <br /> Analyte Result Lumt Umts Level Result %REC Lamas RPD Litmt Notes <br /> Batch 3060397-EPA 5030 waters <br /> Blank(3060397-BM) Prepared&Analyzed 06/17/03 <br /> Tert-amyl methyl ether ND 10 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Methyl tert butyl ether ND 050 " <br /> Surrogate Dibromofluoromethane 472 450 105 84-122 <br /> Surrogate 12Dchloroethane-d4 466 450 104 74-135 <br /> Surrogate Toluene-d8 454 450 101 84-119 <br /> Laboratory Control Sample(3060397-BSI) Prepared&Analyzed 06/17/03 <br /> Tert-amyl methyl ether 454 10 np/l 500 91 70-116 <br /> 19butyl alcohol 773 20 100 77 62-142 <br /> opropyl ether 461 10 500 92 71-121 <br /> Ethyl tert-butyl ether 465 16 500 93 71-110 <br /> Methyl tent-butyl ether 476 050 500 95 77-123 <br /> Surrogate Dibromofluoromethane 457 450 102 84-122 <br /> Surrogate 1,2 Dhchloroethane-d4 415 450 92 74-135 <br /> Surrogate Toluene-l8 445 450 99 84-119 <br /> Laboratory Control Sample Dup(3060397-ESDI) Prepared&Analyzed 06/17/03 <br /> Tert-amyl methyl ether _ 490 10 119/1 500 98 70-116 8 20 <br /> Tertbutyl alcohol 722 20 " 100 72 62-142 7 20 <br /> Di-isopropyl ether 432 10 n 500 86 71-121 6 20 <br /> Ethyl tett-butyl ether 450 10 500 90 71-110 3 20 <br /> Methyl tert-butyl ether 477 050 500 95 77-123 02 20 <br /> Surrogate Dibromofluoromethane 436 450 97 84-122 <br /> Surrogate 12-Dichloroethane-d4 434 450 96 74-135 <br /> Surrogate Toluene-d8 443 450 98 84-119 <br /> �uoia 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 oasts <br /> This analytical report must be reproduced in its entirety <br /> Page 22 of 27 <br />