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885 Jarvis Drive <br /> Sequoia Morgan Fill CA 95037037 <br /> a_ (408)776-9600 <br /> Analytical FAX(408)7826308 <br /> www segwoialabs con) <br /> Secor-Rancho Cordova(ARCO) Project ARCO 44932,Stockton,CA MNl0793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/12/04 12 23 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Iamits RPD Limit Notes <br /> Batch 4KO5015-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(4K05015-BSD1) Prepared&Analyzed 11/05/04 <br /> Surrogate 1 2-Dichloroethane-d4 3 97 49/1 500 79 78-129 <br /> Matrix Spike(4K05015-MSI) Source MNK0087-01 Prepared 11/05/04 Analyzed 11/06/04 <br /> Benzene 5 71 050 ugA 640 Oil 88 69-124 <br /> Ethylbenzene 8 43 050 752 ND 112 84-132 <br /> Methyl ten-butyl ether 112 0 50 992 1 2 101 63-137 <br /> Toluene 336 0 50 31 9 ND 105 78-129 <br /> Xylenes(total) 434 0 50 36 6 0 78 116 83-137 <br /> Gasoline Range Organics(C4-C12) 504 50 440 25 109 70-124 <br /> Surrogate 1 1-Dichloroethane-d4 371 500 74 78-119 LG <br /> Matnx Spike Dup(4K05015-MSD1) Source MNK0087-01 Prepared 11/05/04 Analyzed 11/06/04 <br /> Benzene 5 86 0 50 ug/l 640 0 11 90 69-124 3 20 <br /> Etbylbenzene 869 050 752 ND 116 84-132 3 20 <br /> Methyl tent-butyl ether 11 1 050 992 12 100 63-137 0 9 20 <br /> Toluene 346 050 31 9 ND 108 78-129 3 20 <br /> Xylenes(total) 440 050 36 6 078 118 83-137 1 20 <br /> Gasoline Range Organics(C4-C12) 502 50 440 25 108 70-124 0 4 20 <br /> Surrogate 1 1-Dichloroethane-d4 356 500 71 78-129 LG <br /> Sequoia Analytical-Morgan Hill 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 21 of 22 <br />