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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> + (707)792-1865 <br /> An`dly l ICa� FAX(707)792-0342 <br /> www.sequoialabs.com <br /> LTRS Corp-Sacramento Project:Arco Site 2130,Stockton,CA P504010 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number:GOBZK_0002 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth <br /> 04/13/05 09:46 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %nREC RPD <br /> Analyte am Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> ff <br /> Batch 5040080-EPA 5030B waters/LPA 8260B <br /> Blank(5040080-BLKI) Prepared&Analyzed:04/08/05 <br /> Tert-amyl methyl ether ND 1.0 ug/1 <br /> Benzene ND 0,50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl;ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 5.02 I, 5.00 IOU 84-122 <br /> Surrogate:l,2-Dichloroethane-d4 4.93 5.00 99 74-135 <br /> Surrogate:Toluene-d8 4.98 .5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.20 5.00 104 86-119 <br /> Laboratory Control Sample(5040080-BSI) Prepared&Analyzed:04/08/05 <br /> Tert-amyl methyl ether 4.68 1.0 ug/1 5.00 94 78-117 <br /> Benzene 4.61 0.50 5.00 92 81-118 <br /> Tert-butyl alcohol 103 20 100 103 60-147 <br /> Di-isopropyl ether 5.31 1.0 5.00 106 70-125 <br /> 1,2-Dichloroethane 4.92 0.50 5.00 98 77-126 <br /> Ethanol 90.0 100 100 90 55-200 <br /> Ethylbenzene 5.04 0.50 5.00 101 89-122 <br /> Ethyl tert-butyl;ether 4.83 1.0 5.00 97 71-120 <br /> -Methyl tert-butyl ether 4,94 0.50 5.00 99 70-122 <br /> Toluene 4.99 0.50 5.00 100 84-119 <br /> Xylenes(total)F 14.7 0.50 15.0 98 86-132 <br /> Surrogate:Dibiomofluoromethane 5.08 5.00 102 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 5.19 ,5.00 104 74-135 <br /> Surrogate:Toluene-d8 4.93 5.00 99 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.00 5.00 100 86-119 <br /> a <br /> Sequoia Analytical-Petaluma` The results in this report apply to the samples analyzed in accordance with the chain of <br /> i4 custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> f <br /> Page 27 of 29 <br /> E f <br /> r- <br />