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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> �D— (707)792-1865 <br /> Analytical <br /> FAX(707)742-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/14/05 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B - QuaIity Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC limits RPD limit Notes <br /> Batch 5040112-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5040112-MSI) Source P504013-06 Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether 487 10 ug/l 500 ND 97 78-117 <br /> Benzene 483 050 500 ND 97 81-118 <br /> Tert-butyl alcohol 108 20 100 ND 108 60-147 <br /> Di-tsopropyl ether 470 10 500 ND 94 70-125 <br /> 1,2-Dibromoethane(EDB) 539 050 Soo ND 108 85-125 <br /> 1,2 Dichloroethane 535 0 50 500 ND 107 77-126 <br /> Ethanol 998 100 100 ND 100 55-200 <br /> Ethylbenzene 5 19 050 500 ND 104 89-122 <br /> Ethyl Cert-butyl ether 461 10 500 ND 92 71-120 , <br /> Methyl tert-butyl ether 491 050 " 500 ND 98 70-122 <br /> Toluene 498 050 Soo ND 100 84-119 <br /> Agl&Xylenes(total) 154 050 150 ND 103 86-132 <br /> arrogate Dibromofluoromethane 486 5 00 97 84-112 <br /> Surrogate 12 Dichloroethane-d4 491 5 00 98 74-135 <br /> Surrogate Toluene-0 468 500 94 84-119 <br /> Surrogate 4-Bromofluorobenzene 486 500 97 86-119 <br /> Matrix Spike Dup(5040112-MSDI) Source P504013-06 Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether 508 1 0 ug/l 500 ND 102 78-117 4 20 <br /> Benzene 4 84 050 500 ND 97 81-118 02 20 <br /> Tert-butyl alcohol 115 20 100 ND 115 60-147 6 20 <br /> Di-isopropyl ether 475 10 500 ND 95 70-125 1 20 <br /> 1 2-Dibromoethane(EDB) 537 050 500 ND 107 85-125 02 20 <br /> 1 2-Dichloroethane 530 050 500 ND 106 77-126 09 20 <br /> Ethanol 106 100 100 ND 106 55-200 6 20 <br /> Ethylbenzene 498 050 500 ND 100 89-122 4 20 <br /> Ethyl tert-butyl ether 4 59 10 Soo ND 92 71-120 04 20 <br /> Methyl tert-butyl ether 497 050 500 ND 99 70-122 1 20 <br /> Toluene 5 11 050 " 500 ND 102 84-119 3 20 <br /> Xylenes(total) 153 0 50 150 ND 102 86-132 07 20 <br /> Surrogate Dibromofluoromethane 492 500 98 84-112 <br /> Surrogate 1 2-Dichloroethane-d4 504 500 101 74-135 <br /> Surrogate Toluene-d8 4 83 500 97 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 15 500 103 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 slated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 20 <br />