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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> 4IN (408)776 9600 <br /> FAX iqw Analytical wwseq(408)782-6308 <br /> om <br /> www sequoialabs com <br /> • <br /> Secor- Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO261 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/04/06 13 28 <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 Notes <br /> Batch 6C12002- EPA 503013/5035A McOH/EPA 8260B <br /> Blank(6C12002-BLK1) Prepared&Analyzed 03/12/06 <br /> Cert-Amyl methyl ether ND 0 025 mg/kg <br /> Benzene ND 0 050 " <br /> tert Butyl alcohol ND 50 " <br /> Chlorobenzene ND 0 050 " <br /> Di-isopropyl ether ND 0 025 " <br /> 1 2 Dibromoethane(EDB) ND 0 025 " <br /> 12-Dichlorobenzene ND 0 050 " <br /> 1,3-Dichlorobenzene ND 0 050 " <br /> 1,4 Dichlorobenzene ND 0 050 " <br /> 12-Dichloroethane ND 0 025 " <br /> Ethanol ND t0 " <br /> tert-butyl ether ND 0 025 " <br /> benzene ND 0 050 " <br /> Methyl tent-butyl ether ND 0 025 " <br /> toluene ND 0 050 " <br /> Xylenes(total) ND 0 050 " <br /> Gasoline Range Organics(C4-C 12) ND 25 " <br /> Surrogate 1 2-Dichloroethane-d4 000282 000250 113 60-125 <br /> Surrogate 4-Bromofluorobenzene 000233 000250 93 75-120 <br /> Laboratory Control Sample(6C12002-BSI) Prepared&Analyzed 03/12/06 <br /> Chlorobenzene 0 527 0 050 mg/kg 0 500 105 85-130 <br /> 1 2-Di0lorobenzene 0 518 0 050 0 500 104 80-145 <br /> 1 3 Dichlorobenzene 0 528 0 050 0 500 106 80-130 <br /> 1,4 Dichlorobenzene 0 515 0 050 0 500 103 80-135 <br /> Surrogate 4-Bromofluorobenzene 000270 000250 108 75-120 <br /> Laboratory Control Sample(6CI2002-BS2) Prepared&Analyzed 03/12/06 <br /> Cert Amyl methyl ether 0 730 0 025 mg/kg 0 612 119 80-130 <br /> Benzene 0 221 0 050 0 189 117 65-125 <br /> Cert Butyl alcohol 695 50 633 110 80-165 <br /> Di isopropyl ether 0 667 0 025 0 609 110 85-115 <br /> 1 2-Dibromoethane(EDS) 0 616 0 025 0 624 99 85-130 <br /> 1 2 Dichloroethane 0 594 0 025 0 582 102 63-124 <br /> Ethanol 827 10 618 134 35-150 <br /> Ethyl tent butyl ether 0 709 0 025 0 615 115 80-125 <br /> quota 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 19 of 20 <br />