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885 Jarvis Drive <br /> Hill CA 95037 <br /> r� Sequoia Mnrg�(408)776 9600 <br /> aI%W Analytical www <br /> 782 6308 <br /> sequoiequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <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 Limits RPD Limit Nates <br /> Batch 6DO9003- EPA 5030B/5035A McOH 1 EPA 8260B <br /> Laboratory Control Sample Dup(6D09003-BSD1) Prepared 04/09/06 Analyzed 04/10/06 <br /> tert Amyl methyl ether 0 525 0 025 mg/kg 0 612 86 70-130 8 25 <br /> Benzene 0208 0 050 0 189 110 75-140 3 20 <br /> Cert Butyl alcohol 531 5 0 633 84 70-120 20 15 RB <br /> _Di-isopropyl ether_ _Y _ 0 566 0 025 0 609 93 65-135 5 15 <br /> 1 2 Dibromoethane(EDB) 0 596- �0 025 -0 624 - 96 85-135- —7-- - -20 <br /> X1;2-Dtchloroethane 0550-0025 0 582 95 65-145 3 25 <br /> Ethanol__ 81 10 6 18 110 15-150 20 40 <br /> Ethyl tert-butyl ether _ �0 532 _. 0 025 0 615 87 y 70-130 -7 15 <br /> Ethylbenzene 0 289 0 050 0 273 106 85-130 2 20 <br /> Methyl cert butyl ether 0 280 0 025 0 294 95 70-135 5 15 <br /> 1 of uene 129 0 050 142 91 80 135 5 20 <br /> Xylenes(total) 1 60 0 050 1 53 105 85-135 2 20 <br /> Gasoline Range Organics(C4-C12) 18 7 25 16 5 113 75-140 6 35 <br /> Surrogate 12-Dichloroethane-d4 000398 tr000500 80 55-135 <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 27 of 28 <br />