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885 Jarvis Dnve <br /> Hill CA 95037 <br /> Sequoia Morgan(408)776-9600 <br /> a_ _� <br /> Analytical www <br /> seq(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 Protect 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 6C10044- EPA 5035/EPA 8260B <br /> Blank(6C10044-BLKI) Prepared 03/10/06 Analyzed 03/11/06 <br /> ter[ Amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 " <br /> tert Butyl alcohol ND 0 020 " <br /> Chlorobenzen_e ND 00050 <br /> " <br />- -DI-Isopropyl ether ND-- -� 00050 <br />=1 2-Dibromoethane EDB ND 00050 " <br /> 1,2-Dichlorobenzene ND 00050 _ <br />�l-3-Dichlorobenzene T-.ND-0 0050 <br /> 1 4 Dichlorobenzene ND 00050 " <br /> 1,2-Dichloroethane ND 00050 " <br /> Ethanol ND 010 <br /> Ethyl tert-butyl ether ND 00050 <br /> E.thylbenzene ND 00050 " <br /> Methyl tert-butyl ether ND 00050 <br /> 1 oluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Gasoline Range Organics(C4-C12) ND 0 10 " <br /> 5urrogate 12-Dichloroethane-d4 000455 000500 91 60-125 <br /> Surrogate 4-Bromofluoroben_ene 000503 000500 101 75-120 <br /> Laboratory Control Sample(6Ci0044-BSI) Prepared 03/10/06 Analyzed 03/11/06 <br /> Chlorobenzene 00106 00050 mg/kg 00100 106 85-130 <br /> 1 2 Dichlorobenzene 00108 00050 00100 108 80-145 <br /> 1 3 Dichlorobenzene 00106 00050 00100 106 80-130 <br /> 1,4-Dichlorobenzene 00102 00050 00100 102 80-135 <br /> Surrogate 4-Bromofluoroben_ene 0 00525 000500 105 75-120 <br /> Laboratory Control Sample(6C10044-BS2) Prepared 03/10/06 Analyzed 03/11/06 <br /> tert Amyl methyl ether 00169 00050 mg/kg 00163 104 80-130 <br /> BLnzene 000539 00050 000504 107 65-125 <br /> ten-Butyl alcohol 0 147 0020 0 169 87 80-165 <br /> Ds-Isopropyl ether 00146 00050 00162 90 85-115 <br /> 1 2 Dibromoethane(EDB) 00158 00050 00166 95 85-130 <br /> 1 2-DICh10TOethane 00169 00050 00155 109 63-124 <br /> Ethanol 0161 010 0165 98 35-150 <br /> Ethyl tert-butyl ether 00156 00050 00164 95 80-125 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analysed in accordance with the chainoff <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 13 of 20 <br />