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N J v j Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> Anal tical (707)7921865 <br /> FAX <br /> Y (707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Managcr Jay Johnson 07/15/04 10 23 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nntec <br /> Batch 4070035- EPA 5030B waters <br /> Matrix Spike(4070035-MSI) Source P406422-04 Prepared&Analyzed 07/02/04 <br /> Tert-amyl methyl ether 4990 1000 ug/1 5000 ND 100 78-117 <br /> Benzene 14600 500 " 5000 10000 92 81-118 <br /> Tert-butyl alcohol 105000 20000 100000 ND 105 60-147 <br /> Di-isopropyl ether 4670 1000 5000 ND 93 70-125 <br /> 1,2-Dibromoethane(EDB) 5660 500 5000 ND 113 85-125 <br /> 1,2-Dichloroethane 5020 500 5000 ND 100 77-126 <br /> Ethanol 94300 100000 100000 ND 94 55-200 <br /> Ethylbenzene 7090 500 5000 1900 104 89-122 <br /> Ethyl tert-butyl ether 4750 1000 5000 ND 95 71-I20 <br /> Methyl tert-butyl ether 4730 500 5000 ND 95 70-122 <br /> Toluene 23500 500 5000 19000 90 84-119 <br /> Xylenes(total) 30200 500 15000 13000 115 86-132 <br /> rogale Dibromofluoromethane 484 500 97 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 422 500 84 74-135 <br /> Surrogate Toluene-d8 496 500 99 84419 <br /> Surrogate 4-Bromgfluorobenzene 497 500 99 86-119 <br /> Matrix Spike Dup(4070035-MSDI) Source P406422-04 Prepared&Analyzed 07/02/04 <br /> Teri-amyl methyl ether 4960 1000 ug/i 5000 ND 99 78-117 06 20 <br /> Benzene 15300 500 5000 10000 106 81-118 5 20 <br /> Tert-butyl alcohol 105000 20000 100000 ND 105 60-147 0 20 <br /> Di-isopropyl ether 4580 1000 5000 ND 92 70-125 2 20 <br /> 1,2-Dibromoethane(EDB) 5540 500 5000 ND 111 85-125 2 20 <br /> 1,2-Dichloroethane 5050 500 5000 ND 101 77-126 06 20 <br /> Ethanol 98900 100000 100000 ND 99 55-200 5 20 <br /> Ethylbenzene 7010 500 5000 1900 102 89-122 1 20 <br /> Ethyl Cert-butyl ether 4770 1000 5000 ND 95 71-120 04 20 <br /> Methyl tert-butyl ether 4700 500 5000 ND 94 70-122 06 20 <br /> Toluene 25000 500 5000 19000 120 84-I19 6 20 QMOI <br /> Xylenes(total) 29600 500 15000 13000 111 86-132 2 20 <br /> Surrogate Dibrornofluoromethane 472 500 94 84-122 <br /> Surrogate 1,2-Drchloroethane-d4 429 500 86 74-135 <br /> Surrogate Toluene-d8 490 500 98 84-119 <br /> Surrogate 4 Bromo,fluorobenzene 486 11500 97 86-119 <br /> �quola Analytical-Petaluma The results in thrs report apply to the samples analyzed in accordance ivrth the chain of <br /> custody document Unless otherwise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 14 of 18 <br />