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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> ,!Z�� Analytical (408)7764300 <br /> FAX(408)782-6308 <br /> www sequoialabs com <br /> Seco'-Rancho Cordova(ARCO) Project ARCO#2133, Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,GA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 03/31/06 14 03 <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 6CO9012- EPA 5030B P/T/EPA 8260B <br /> Blank(6C09012-BLKI) Prepared&Analyzed 03/09/06 <br /> tert-Amyl methyl ether ND 050 ugA <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Chlorobenzene ND 0 50 " <br /> Di isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 12-Dichlorobenzene ND 0 50 " <br /> 13-Dichlorobenzene ND 050 " <br /> I 4-Dichlorobenzene ND 050 " <br /> 1,2-Dii.hloroethane ND 0 50 " <br /> Ethanol ND 300 " <br /> tent butyl ether ND 0 50 <br /> benzene ND 0 50 <br /> ethyl tort-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Sterrogare 12-Drchloroethane-d4 242 250 97 60-135 <br /> Surrogate 4 Bromofluorobencene 217 250 87 70-120 <br /> Sun ogate Dibromofluoromethane 2 65 250 106 65-130 <br /> Surrogate Toluene-d8 249 250 100 70-120 <br /> Laboratory Control Sample(6C09012-BSI) Prepared&Analyzed 03/09/06 <br /> Chlorobenzene 207 050 ugA 200 104 80-120 <br /> 1,2 Dichlorobenzene 206 050 200 103 80-125 <br /> l 3-Dichlorobenzene 208 050 200 104 75-120 <br /> l 4-Dichlorobenzene 208 050 200 104 75-120 <br /> Surrogate l 2-Drchloroethane-d4 135 250 94 60-135 <br /> Surrogate 4-Bromofluorobenzene 249 250 100 70-120 <br /> Surrogate Dibromofluoromethane 160 250 104 65-130 <br /> Surrogate Toluene-d8 259 250 104 70-120 <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 9 of 20 <br />