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1885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> 4D (408)Analytical 782 630 <br /> FAX(408)782 63088 <br /> www sequoialabs com <br /> URS Corporation[Arcol] Project ARCO#6020,Manteca,CA MOF0I50 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/20/05 13 36 <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 RFD Lint Notes <br /> Batch 5FO8009-EPA 5030B PIT/EPA 8260B <br /> Blank(5F08009-BLK1) Prepared&Analyzed 06/08/05 <br /> tert-Amyl methyl ether ND 050 ugll <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 50 <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Diehloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tent-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl ted-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> asohne Range Organics(C4 C12) ND 50 " <br /> +Surrogate 12-Dichloroethane-d4 463 500 93 60-135 <br /> Laboratory Control Sample(SF08009-BS1) Prepared&Analyzed 06/08/05 <br /> tert-Amyl methyl ether 112 050 ug/l 100 112 80-115 <br /> Benzene 913 050 IO 0 91 65-115 <br /> tert-Butyl alcohol 500 20 500 100 75-150 <br /> Di-isopropyl ether 104 050 100 104 75-125 <br /> 1,2 Dibromoethane(EDB) 918 050 100 92 85-120 <br /> 1,2-Dlehloroethane 690 050 100 69 85-130 HM <br /> Ethanol 950 100 200 48 70-135 HM <br /> Ethyl tert-butyl ether 946 050 100 95 75-130 <br /> Etbylbenzene 922 050 100 92 75-135 <br /> Methyl Cert-butyl ether 738 050 100 74 65-125 <br /> Toluene 115 050 100 115 85-120 <br /> Xylenes(total) 296 050 300 95 85-125 <br /> Surrogate I 1-Dichloroethane-d4 313 500 63 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 1 i <br />