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i' <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> 4D Analytical (707)792-0865 <br /> i � 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 04/13/05 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 %nREC limits RPD limit Notes <br /> Batch 5040080-EPA 5030B waters/EPA 8260B <br /> Matrix Spike.(5040080-MSI) Source:P504010-17 Prepared&Analyzed:04/08/05 <br /> Tert-amyl methyl ether 45.5 10 ug/l 50.0 ND 91 78-117 <br /> Benzene 67.0 5.0 50,0 23 88 81-118 <br /> Ten-butyl alcohol 1080 200 1000 ND 108 60-147 <br /> Di-isopropyl ether 48.5 10 50.0 ND 97 70-125 <br /> 1,2-Dichloroethane 322 5.0 50.0 270 104 77-126 <br /> Ethanol 862 1000 1000 ND 86 55-200 <br /> Ethylbenzene 55.4 5.0 50.0 6.5 98 89-122 <br /> Ethyl tert-butyl ether 42.6 10 50.0 ND 85 71-120 <br /> Methyl tert-butyl ether 47.1 5.0 50.0 1.9 90 70-122 <br /> Toluene 47.0 5.0 50.0 ND 94 84-119 <br /> Xylenes(total) 142 5.0 150 ND 95 86-132 <br /> r <br /> Surrogate:Dibr,omofduoromethane 5.21 5.00 104 84-121 <br /> 3urrogate:1,2-Dichloroethane d4 5.19 5.00 106 74-135 <br /> Surrogate:Tol6ene-d8 5.05 5.00 101 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.20 5.00 104 86-119 <br /> Matrix Spike;Dup(5040080-MSD1) Source:P504010-17 Prepared&Analyzed:04/08/05 <br /> Tert-amyl methyl ether 48.3 10 ugll 50.0 ND 97 78-117 6 20 <br /> Benzene 1 72.2 5.0 50.0 23 98 81-118 7 20 <br /> Tert-butyl alcohol 1100 200 1000 ND 110 60-147 2 20 <br /> Di-isopropyl ether 51.9 10 50.0 ND 104 70-125 7 20 <br /> 1,2-Dichloroethane 344 5.0 50.0 270 148 77-126 7 20 BB,LM <br /> Ethanol 994 1000 1000 ND 99 55-200 14 20 <br /> Ethylbenzene 58.4 5.0 -50.0 6.5 104 89-122 5 20 <br /> Ethyl tent-butyl ether 45.7 10 50.0 ND 91 71-120 7 20 <br /> Methyl tert-butyl ether 49.5 5.0 50.0 1.9 95 70-122 5 20 <br /> Toluene 50.4 5.0 _ 50.0 ND 101 84-119 7 20 <br /> Xylenes(total) 152 5.0 150 ND 101 86-132 7 20 <br /> Surrogate:Dibromofluoromethane 5.27 5.00 105 84-121 <br /> Surrogate:l,2-Dichloroethane-d4 5.29 5.00 106 74-135 <br /> Surrogate:Toluene-d8 5.14 5.00 103 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.22 5.00 104 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 28 of29 <br /> E <br /> i <br /> { <br />