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9 <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> IW��Analytical (747)792-1865 <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS 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 Manager:Vemon P.Elarth 04/I3105 09:46 <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 Limits RPD Limit Notes <br /> Batch 5040066-EPA 5030B waters/EPA 8260B <br /> Matrix Spike:(5040066-MSl) Source:P504010-12 Prepared&Analyzed:04/07/05 <br /> Tert-amyl methyl ether 46.5 10 ugA 50.0 ND 93 78-117 <br /> Benzene 46.6 5.0 50.0 1.3 91 81-118 <br /> Ter(-butyl alcohol 1150 200 1000 ND 115 60-147 <br /> Di-isopropyl ether 47.6 10 50.0 ND 95 70-125 <br /> 1,2-Dichloroethane 227 5.0 50.0 170 114 77-126 <br /> Ethanol 901 1000 1000 ND 90 55-200 <br /> Ethylbenzene 49,8 5.0 50.0 ND 100 89.122 <br /> Ethyl tent-butyl ether 45.2 10 50.0 ND - 90 71-120 <br /> Methyl teo-bury.]ether 51.2 5.0 50.0 2.3 98 70-122 <br /> Toluene 49,4 5.0 50.0 ND 99 84-119 <br /> Xylenes(total) 145 5.0 150 ND 97 86-132 <br /> U S <br /> urrogate:Dibromofluoromethane 5.00 5.00 100 84-121 <br /> urrogate:l,2-Dichloroethane-d4 4.96 5.00 99 74-135 <br /> Surrogate:Toluene-d8 4.84 5.00 97 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.93 5.0099 86-119 <br /> Matrix Spike'Dup(504006&MSD1) Source:P504010-12 Prepared&Analyzed:04/07/05 <br /> Teri-amyl methyl ether 44.7 10 ug/i 50.0 ND 89 78-117 4 20 <br /> Benzene 45.9 5.0 50.0 1.3 89 81-118 2 20 <br /> Tert-butyl alcohol 1050 200 1000 ND 105 60-147 9 20 <br /> Di-isopropyl ether 46.2 10 50.0 ND 92 70-125 3 20 <br /> 1,2-Dichloroethane 205 5.0 " 50.0 170 70 77-126 10 20 BB,LN <br /> Ethanol 840 1000 1000 ND 84 55-200 7 20 <br /> Ethylbenzene 50.1 5.0 50.0 ND 100 89-122 0.6 20 <br /> Ethyl tert-butyl ether 43.7 10 50.0 ND 87 71-120 3 20 <br /> Methyl tert-butyl ether 49.5 5.0 50.0 2.3 94 70-122 3 20 <br /> Toluene 47.9 5.0 50.0 ND 96 84-119 3 20 <br /> Xylenes(total) : 147 5.0 150 ND 98 86-132 1 20 <br /> Surrogate.,Dibromofluoromethane 4.98 5.00 100 84-112 <br /> Surrogate:1,2-Dichloroethane-d4 4.83 5.00 97 74-135 <br /> Surrogate:Toluene-d8 497 5.00 99 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.92 5.00 98 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 />` 0 This analytical report must be reproduced in its entirety. <br /> Page 26 of 29 <br /> i <br /> fE <br />