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Sequoia <br /> 8Jarvis 7 <br /> ta) Se[.l U Ola Morgan Hill CA 95035037 <br /> (408)776 9600 <br /> Analytical FAX(408)792-6308 <br /> www sequoiatabs com <br /> URS Corporation fArcoI Project ARCO#5469, Stockton, CA M0I0324 <br /> 2870 Gateway Oaks Dr, Ste 300 Project Number GOBZP-0002 Reported <br /> Sacramento CA,95833 Project Manager,lay Johnson 09/28/05 09 43 <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 5121005- EPA 5030B P/T/EPA 8260B <br /> Blank(5121005-BLK1) Prepared&Analyzed 09/21/05 <br /> tert-Amyl methyl ether ND 050 ugA <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 5 0 <br /> Di-isopropyl ether ND 0 50 " <br /> 12-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 0 50 <br /> es(total) ND 0 50 <br /> ne Range Organics(C4-C12) ND 50 <br /> ,Surrogate 12-Dtchloroethane-d4 481 500 96 60-135 <br /> Laboratory Control Sample(5121005-BSI) Prepared&Analyzed 09/21/05 <br /> tert-Amyl methyl ether 15 1 0 50 ug/l 15 0 101 80-115 <br /> Benzene 501 050 5 16 97 65-115 <br /> tent-Butyl alcohol 149 20 143 104 75-t50 <br /> Di-isopropyl ether 14 8 050 15 1 98 75-125 <br /> 1 2-Dtbromoethane(EDB) 153 050 14 8 103 85-120 <br /> 1,2-Dtchloroethane 15 1 0 50 14 7 103 85-130 <br /> Ethanol 185 100 141 131 70-135 <br /> Ethyl tert-butyl ether 15 6 0 50 15 0 104 75-130 <br /> Ethylbenzene 6 72 0 50 754 89 75-135 <br /> Methyl tert-butyl ether 722 0 50 702 103 65-125 <br /> Toluene 33 1 0 50 372 89 85-120 <br /> Xylenes(total) 380 0 50 41 4 92 85-125 <br /> Gasoline Range Organics(C4-Cl2) 477 50 440 108 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 5 10 5 00 102 60-135 <br /> o <br /> nota Analytical - Morgan Hill The results in this report apply to the samples analy_ed 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 he reproduced in its entirety <br /> Page 14 of 18 <br />