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,Sequoia 885 Jarvis Drive <br /> 1 Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> iqw,Analyfical FAX(408)782-6308 f <br /> ,o www.sequoialabs.com <br /> URS Corporation[Arco I] Project:ARCO#12130,Stockton,CA M0I0544 <br /> 2876 Gateway pafcs Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagenVernon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %nREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5122601 -EPA 5030B PIT 1 EPA 8260B <br /> Blank(5122001-BLKI) Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether ND 0.50 ug/l <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> 9, <br /> Ethylbenzene ;1 ND 0.50 " <br /> Methyl tert-butyl ether ND- 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> `Gasoline RangerOrganics(C4-C12) ND 50 " <br /> tiurrogate:l,1-Dichloraeihane-d4 1.95 1.50 .78 60-135 <br /> Blank(5I22001-BLK2) Prepared&Analyzed:09/22/05 <br /> cert-Amyl methyl ether ND 0.50 ugll <br /> Benzene ND 0.50 " <br /> lent-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 <br /> Methyl tert-butt''1 ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total)V ND 0.50 " <br /> Gasoline Range.Organics(C4-Cl2) ND 50 " <br /> 5urrogate:l,2-Dichloroethane-d4 1.98 2.50 79 60-135 <br /> Sequoia 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 we[weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 15 of 25 <br /> 1 <br /> s <br />