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1455 McDowell Blvd North Ste p <br /> 6) FAXSequoia Petaluma CA 94954 <br /> (70-7)792 1865 <br /> (707)79 4 <br /> qW Analytical www sequoialabscoco <br /> 0 <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 Limn Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3110076-EPA 5030 waters <br /> Blank(3110076-BLKI) Prepared&Analyzed 11/05/03 <br /> Tert-amyl methyl ether ND 024 ppmv <br /> Ter%-amyl methyl ether ND 1 0 mg/m'Air <br /> Benzene ND 016 ppmv <br /> Benzene ND 050 mg/ml Air <br /> Tert-butyl alcohol ND 6 6 ppmv <br /> Tort-butyl alcohol ND 20 mg/ml Air <br /> Di-isopropyl ether ND 024 ppmv <br /> Di-isopropyl ether ND 10 mg/m'Air <br /> Ethanol ND 53 ppmv <br /> Ethanol ND 100 mg/ml Air <br /> Ethylbenzene ND 012 ppmv <br /> Ethylbenzene ND 050 mg/ml Air <br /> Ethyl tert-butyl ether ND 024 ppmv <br /> Ethyl tert-butyl ether ND 10 mg/ml Air <br /> Methyl tert-butyl ether ND 0 14 ppmv <br /> Methyl tort-butyl ether ND 050 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/ml Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Xylencs(total) ND 050 rng/m'Air <br /> Surrogate Dibromofluoromethane 0 654 ppmv 0 637 103 84-122 <br /> Surrogate DibromoJluoromethane 513 mg/m'Air 300 103 84-112 <br /> Surrogate 12-Dichloroethane-d4 123 ppmv 119 103 74-135 <br /> Surrogate 1 2-Dichloroethane-d4 520 mg/m'Azr 500 104 74-135 <br /> Surrogate Toluene-d8 127 ppmv 133 95 84-119 <br /> Surrogate Toluene-d8 479 mg/m'Azr 500 96 84-119 <br /> Laboratory Control Sample(3110076-BS1) Prepared&Analyzed 11/05/03 <br /> Tert-amyl methyl ether 5 55 10 mg/m'Air 500 111 70-116 <br /> Teri-amyl methyl ether 133 024 ppmv 120 111 70-116 <br /> Benzene 161 0 16 1 57 103 81-118 <br /> Benzene 5 12 050 mg/ml Air 500 102 81-118 <br /> Tert-butyl alcohol 360 6 6 ppmv 33 1 109 62-142 <br /> Tert-butyl alcohol 109 20 mg/ml Air 100 109 62-142 <br /> Di-isopropyi ether 1 23 024 ppmv 1 20 102 71-121 <br /> Di-isopropyl ether 5 13 1 0 mg/rir'Air 500 103 71 121 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwtse stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 19 <br />