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aSequoia 885 Jarvis DriveMorS-Hdl,CA 95037 <br /> tAnalytical (408)776 9600 <br /> FAX equoi labs o. <br /> www sequoielabs com <br /> Secor-Rancho Cordova(ARCO) Pro)ect ARCO#4932,Stockton,CA <br /> 3017 Kilgore Rd Suite 100 MNorted <br /> Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky <br /> 1112104 12 23 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Analyte Reporting Spike Source %REC RPP <br /> Result Limll units Level Result %REC [am1t5 RPD LimN <br /> Note <br /> Batch 4KO3010-EPA 5030B P/T/EPA 8260B <br /> Blank(4K03010-BLK1) Prepared&Analyzed 11103/04 <br /> ted-Amyl methyl ether ND 050 Ug/1 <br /> Benzene <br /> ND 050 " I <br /> tort Butyl alcohol ND 20 ^ <br /> Dt-isopropyl ether ND 050 " <br /> 1,2-Dibrornoethane(EDB) ND 050 " <br /> 1,2-Ihchloroethane ND 050 ^ <br /> Ethanol ND 100 <br /> Ethyl tert-butyl etherIC <br /> ND 0 SO <br /> Ethylbenzene ND 050 " <br /> Methyl lerl-butyl other ND 050 ^ <br /> Toluene ND 050 " <br /> encs(total) ND 0 50 " <br /> tme RangeOrganica(C4-Ci2} ND 50 " <br /> Surrogate 1 2-prchloroetharte-d4 4 77 500 95 78-129 <br /> Laboratory Control Sample(4K03010-BSI) Prepared&Analyzed 11/03/04 <br /> tort-Amyl methyl ether 899 050 UFA 100 90 82 I40 <br /> Bertzene 940 050 ^ 100 94 69-124 <br /> text-Butyl alcohol 510 20 Soo 102 56-131 <br /> Di-[°°propyl ether 985 050 too 98 76-130 <br /> 1,2-Dibromoethane(EDB) 945 050 100 94 77-132 <br /> 1,2-Dichloroethane 997 050 " too 100 77-136 <br /> Ethanol 198 100 200 99 31-143 <br /> Ethyl cert-butyl other „ IC <br /> 978 050 100 98 81-121 <br /> Ethylbenzene 907 050 100 91 84-132 <br /> Methyl tert-butyl ether 940 050 I o 0 94 63 137 <br /> Toluene 927 050 100 93 78-129 <br /> Xylenes(total) 307 050 ” 300 102 83 137 <br /> Surrogate 1,2-Dlchloroethane-d4 472 500 94 78-119 <br /> Sequoia Analytical-Morgan Hill Me results in Chir report apply to the samples ana <br /> 47ed In accordance custody document Unless otherwise stated results are reported an a wet weight basis h the chain f <br /> 0 Thu analytical report must be reproduced in its entirety <br /> Page 15 of 22 <br />