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a- ) (7Blvd,North <br /> Sequoia 1455 McDowell <br /> alum CA 94t9 4 <br /> Analytical FAX <br /> 07)79 -0855 <br /> {707 792-0342 <br /> . www,sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/18/03 21:10 <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 3050783-EPA 5030 waters <br /> Matrix Spike(3050783-MSI) Source:P305431-04 Prepared:05/31/03 Analyzed:06/01/03 <br /> Ten-amyl methyl ether 5.35 1.0 ug/I 5.00 ND 107 70-116 <br /> Tert-butyl alcohol 102 20 100 ND 102 62-142 <br /> Di-isopropyl ether 5.32 1.0 5.00 ND 1% 71-121 <br /> 1,2-Dibromoethane(ED8) 5.44 0.50 5.00 ND 109 92-117 <br /> 1,2-Dichloroethane 5.39 0.50 5.00 ND 108 79-126 <br /> Ethanol 114 100 100 ND 114 0-200 <br /> Ethyl tert-butyl ether 5.21 1.0 5.00 ND 104 71-110 <br /> Methyl cert-butyl ether 7.09 0.50 5.00 1.6 110 80-109 Q-LIM <br /> Surrogate:Dibromofluoromethane 4.83 5.00 97 84-121 <br /> Surrogate:l,2-Dichloroethane-d4 4.94 5.00 99 74-135 <br /> Surrogate:Toluene-d8 4.87 5.00 97 84-119 <br /> Aftatrix Spike Dup(3050783-MSD1) Source: P305431-04 Prepared:05/31/03 Analyzed:06/01/03 <br /> 'Wert-amyl methyl ether 5.41 1.0 UO 5.00 ND 108 70-116 1 20 <br /> Tert-butyl alcohol 116 20 100 ND 116 62-142 13 20 <br /> Di-isopropyl ether 5.32 1.0 5.00 ND 106 71-121 0 20 <br /> 1,2-Dibromoethane(EDB) 5.41 0.50 5.00 ND 108 92-117 0.6 20 <br /> 1,2-Dichioroethane 5.53 0.50 5.00 ND 111 79-126 3 20 <br /> Ethanol 146 100 100 ND 146 0-200 25 200 <br /> Ethyl tert-butyl ether 5.25 1.0 5.00 ND 105 71-110 0.8 20 <br /> Methyl tert-butyl ether 7.10 0.50 5.00 1.6 110 80-109 0.1 20 Q-LIM <br /> Surrogate:Dibromofluoromethane 4.74 5.00 95 84-121 <br /> Surrogate:l,2-Dichloroethane-d4 4.87 5.00 97 74-135 <br /> Surrogate:Toluene-d8 4.96 5.00 99 84-119 <br /> Batch 3060010-EPA 5030 waters <br /> Blank(3060010-13LKI) Prepared&Analyzed:06/02/03 <br /> Tert-amyl methyl ether ND 1.0 ug/1 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 4.97 5.00 99 84-121 <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 /> This analytical report must be reproduced in its entirety. <br /> Page 29 of 36 <br />