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Sequoia E455 McDoue}I lNorth Ste <br /> Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoiatabs com <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P310580 <br /> 3017 Kilgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/06/03 18 54 <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 3110076-EPA 5030 waters <br /> Laboratory Control Sample(3110076-BSI) Prepared&Analyzed 11/05/03 <br /> Ethanol 102 100 mg/m'Air 100 102 65-135 <br /> Ethanol 542 53 ppmv 53 2 102 65-135 <br /> Ethylbenzene 511 050 mg/ml Air 500 102 89-122 <br /> Ethylbenzene 118 012 ppmv 115 103 89-122 <br /> Ethyl tort butyl ether 130 024 " 1 20 108 71-110 <br /> Ethyl tent butyl ether 543 10 mg/ml Air 500 109 71-110 <br /> Methyl tort-butyl ether 149 014 ppmv 139 107 77-123 <br /> Methyl tert-butyl ether 536 050 mglm'Air 500 107 77-123 <br /> Toluene 5 21 050 500 104 84-10 <br /> 9 <br /> Toluene 139 013 ppmv 133 105 84-119 <br /> Xylenes(total) 354 012 346 102 86-132 <br /> Xylenes(total) 15 3 050 mg/ml Air 150 102 86-132 <br /> Surrogate Dibromofluoromethane 0 648 ppmv 0 637 101 84-112 <br /> Surrogate Dibromofluoromethane 509 mg/m'Aw 500 101 84-112 <br /> Surrogate 12-Dichloroethane-d4 114 ppmv 119 104 74-135 <br /> Surrogate 1 2-Dichloroethane-d4 522 mg/m'Aur 500 104 74-135 <br /> Surrogate Toluene-d8 498 500 100 84-119 <br /> Surrogate Toluene-d8 131 ppmv 133 99 84-119 <br /> Laboratory Control Sample Dup(3110076-BSDI) Prepared&Analyzed 11/05/03 <br /> Tert-amyl methyl ether 532 10 mg/m'Air 500 106 70-116 4 20 <br /> Tert-amyl mcthyl ether 128 024 ppmv 120 107 70-116 4 20 <br /> Benzene 158 016 157 101 81-118 2 20 <br /> Benzene 503 050 mg/ml Aur 500 101 81-118 2 20 <br /> Tort-butyl alcohol 110 20 100 110 62-142 0 9 20 <br /> Tert-butyl alcohol 36 2 66 ppmv 331 109 62-142 0 6 20 <br /> Diasopropyl ether 494 10 mg/m'Air 500 99 71-121 4 20 <br /> Di-isopropyl ether 1 18 024 ppmv 1 20 98 71-121 4 20 <br /> Ethanol 965 100 mg/ml Air 100 96 55-135 6 20 <br /> Ethanol 513 53 ppmv 532 96 65-135 5 20 <br /> Ethylbetizene 120 012 " 115 104 89-122 2 20 <br /> Ethylbenzene 5 19 050 mg/m'Air 500 104 89-122 2 20 <br /> Ethyl tent-butyl ether 5 15 10 Soo 103 71-110 5 20 <br /> Ethyl tert-butyl ether 124 024 ppmv 120 103 71-110 5 20 <br /> Methyl tent-butyl ether 1 44 0 14 1. 139 104 77 123 3 20 <br /> Methyl tert-butyl ether 5 18 050 mg/m'Air 500 104 77 123 3 20 <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 15 of 19 <br />