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1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma CA 94954 <br /> 7 7 (707)792-1865 <br /> IIW Analytical FAX(707)792-0342 <br /> www sequaialabs Com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 ProlectNumber WR36619 Reported <br /> Sacramento CA,95833 Protect Manager 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 Notes <br /> Batch 4070076-EPA 5030B waters <br /> Laboratory Control Sample Dup(4070076-BSD1) Prepared&Analyzed 07/06/04 <br /> Tert-amyl methyl ether 451 10 ug/l 500 90 78-117 3 20 <br /> Benzene 539 050 " 5 00 108 81-118 3 20 <br /> Tert-butyl alcohol 119 20 " 100 119 60-147 20 20 <br /> Di-isopropyl ether 6 01 1 0 " 500 120 70-125 3 20 <br /> 1,2-Dibromoethane(EDB) 573 0 50 1. 500 115 85-125 3 20 <br /> 1 2-Dichloroethane 637 050 5 00 127 77-126 0 6 20 QC01 <br /> Ethanol 169 100 " 100 169 55-200 8 20 <br /> Ethylbenzene 536 050 500 107 89-122 2 20 <br /> Ethyl Cert-butyl ether 524 1 0 5 00 105 71-120 6 20 <br /> Methyl tert-butyl ether 541 050 500 108 70-122 6 20 <br /> Toluene 5 17 050 5 00 103 84-119 3 20 <br /> Xylenes(total) 168 050 15 0 112 86-132 2 20 <br /> rogate Dibromofluoromethane 667 .500 133 84-122 Sol <br /> Surrogate 1 2-Dichloroethane-d4 651 500 130 74-135 <br /> Surrogate Toluene-d8 583 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 523 5 00 105 86-119 <br /> guola Analytical-Petaluma 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 ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 18 <br />