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885 Jarvis Drive <br /> ,�D (408)Sequoia Morgan Hill CA 95037 <br /> 776 9600 <br /> Analytical FAX(408)782 6308 <br /> www sequoialabs com <br /> • <br /> Secor- Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO263 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco 42I33, Stockton,CA 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 %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6CO9012- EPA 5030B P/T 1 EPA 8260B <br /> Blank(6C09012-BLK1) Prepared&Analyzed 03/09/06 <br /> tert Amy]methyl ether ND 050 ug/l <br /> Benzene ND 0 50 " <br /> tent Butyl alcohol ND 20 " <br /> Chlorobenzene ND 0 50 " <br /> Dt isopropyl ether ND 0 50 " <br /> 1,2 Dibromoethane(EDB) ND 0 50 " <br /> 1 2 Dichlorobenzene ND 050 " <br /> 1,3 Dichlorobenzene ND 050 " <br /> 1,4-Dichlorobenzene ND 050 " <br /> 1 2 Dtchloroethane ND 050 " <br /> Ethanal ND 300 " <br /> I tert butyl ether ND 05018 <br /> (benzene ND 050 <br /> Methyl ten-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 2-Dtchloroethane-d4 2 42 2 50 97 60-135 <br /> Surrogate 4-Bromofluoroben_ene 217 250 87 70-120 <br /> Surrogate Dibromofluoromethane 2 65 250 106 65-130 <br /> Surrogate Toluene-d8 249 250 100 70-120 <br /> Laboratory Control Sample(6C09012-BS1) Prepared&Analyzed 03/09/06 <br /> Chlonobenzene 207 050 ugll 200 104 80-120 <br /> 1 2-Dichlorobenzene 206 0 50 200 103 80-125 <br /> 1 3-Dichlorobenzene 208 050 200 104 75-120 <br /> 1 4-Dichlorobenzene 208 050 200 104 75-120 <br /> Surrogate 12-Drchloroethane-d4 2 35 2 50 94 60-135 <br /> Suri ogale 4-Bromof7uorobenzene 249 250 100 70-120 <br /> Stu rogale Dibromofluoromethane 260 2 50 104 65-130 <br /> Suri agate Toluene-0 259 250 104 70-120 <br /> quoia Analytical -Morgan Hill The results in this report apply to the samples analysed 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 />