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1455 McDowell lNorth Ste D <br /> D Sequoia Petaluma707)79291865 <br /> Analytical FAX(707)7920342 <br /> www sequoialabs co <br /> r <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 LlmltS RPD Limit Notes <br /> Batch 3110076-EPA 5030 waters <br /> Laboratory Control Sample Dup(3110076-BSD/) Prepared&Analyzed 11/05/03 <br /> Toluene 137 013 ppmv 1 33 103 84-119 l 20 <br /> Toluene 5 14 0 50 mg/ml Air 500 103 84 119 I 20 <br /> Xylenes(total) 3 54 0 12 ppmv 346 102 86-132 0 20 <br /> Xylenes(total) 153 0 50 mg/ml Air 150 102 86-132 0 20 <br /> Surrogate Dibromofluoromethane 4 86 11500 97 84-122 <br /> Surrogate Dibromofluoromethane 0 620 ppmv 0 637 97 84-121 <br /> Surrogate 12-Dichloroethane-d4 488 mg/m'.4ir 500 98 74-135 <br /> Surrogate 12-Dichloroethane-d4 116 ppmv 119 97 74-135 <br /> Surrogate Toluene-d8 4 73 mglm'4tr 500 95 84-119 <br /> Surrogate Toluene-d8 126 ppmv 133 95 84-119 <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 wetght basis j <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 19 <br />