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-Y- all Blvd,North Ste D <br /> 1455 McDow <br /> Sequoia Petaluma,CA 94954 <br /> a_ _� <br /> Analytical (707)792- <br /> FAX(707)792-0342342 <br /> wwwsequoial abs,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 RPL) Limit Notes <br /> Batch 3050779-EPA 5030 waters <br /> Blank(3050779-BLKI) Prepared&Analyzed:05/30/03 <br /> Tert-amyl methyl ether ND LO ug/1 <br /> 'cert-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 tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromerhane 4.64 5.00 93 84-122 <br /> Surrogate:l,2-Dichloroelhane-d4 4.74 5.00 95 74-135 <br /> Surrogate:Toluene-d8 4.98 5.00 100 84-119 <br /> A9016boratory Control Sample(3050779-BS1) Prepared:05/30/0.3 Analyzed:05/31/03 <br /> 'qW,crt-amyl methyl ether 5.29 1,0 uWI 5.00 106 70-116 <br /> Tert-butyl alcohol 111 20 100 lit 62-142 <br /> Di-isopropyl ether 5.23 1.0 5.00 105 71-121 <br /> 1,2-Dibrornoethane(EDB) 5.27 0.50 5.00 105 92-117 <br /> 1,2-Dichloroethane 5.47 0.50 5.00 109 79-126 <br /> Ethanol 124 100 100 124 0-200 <br /> Ethyl tert-butyl ether 5.17 1.0 5.00 103 71-110 <br /> Methyl tert-butyl ether 5.38 0.50 5.00 108 79-118 <br /> Surrogate:Dibromofluoromethane 4.83 5.00 97 84-121 <br /> Surrogate:1,2-Dichloroethane-d4 4.88 5.00 98 74-135 <br /> Surrogate:Toluene-d8 4.99 5.00 100 84-119 <br /> Laboratory Control Sample Dup(3050779-BSDI) Prepared: 05/30/03 Analyzed:05/31/03 <br /> Tert-amyl methyl ether 5.43 1.0 ug/1 5.00 109 70-116 3 20 <br /> Tert-butyl alcohol 115 20 100 115 62-142 4 20 <br /> Di-isopropyl ether 5.26 1.0 5.00 105 71-121 0.6 20 <br /> 1,2-Dibromoethane(EDB) 5.45 0.50 5.00 109 92-117 3 20 <br /> 1,2-Dichloroethane 5.66 0.50 5.00 113 79-126 3 20 <br /> Ethanol 136 100 t00 136 0-200 9 200 <br /> Ethyl tert-butyl ether 5.21 1.0 5.00 104 71-110 0.8 20 <br /> Methyl tert-butyl ether 5.48 0,50 5.00 110 79-118 2 20 <br /> Surrogate:Dibromofluoromethane 4.77 5.00 95 84-121 <br /> Surrogate: l,2-Dichloroethane-d4 4.85 5.00 97 74-135 <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 27 of 36 <br />