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l Blvd,North Ste <br /> Sequoia 1455 McDowPetaluma,CA 9 954 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <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 4010114-EPA 5030B waters <br /> Laboratory Control Sample 4010114-BS1 Prepared&Analyzed:01/09/04 <br /> Xylenes(total) 16.7 0.50 ug/l 15.0 l 1 1 86-132 <br /> Surrogate:Dibromofluoromethane 6.37 6.00 106 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 7.08 6.00 118 74-135 <br /> Surrogate: Toluene-d8 6.20 6.00 103 84-119 <br /> Surrogate:4-Bromofluorohenzene 6.30 6.00 105 86-119 <br /> Laboratory Control Sample Uup(4010114-BSD1) Prepared&Analyzed:01/09/04 <br /> Tert-amyl methyl ether 5.41 1.0 ugll 5.00 108 78-117 2 20 <br /> Benzene 4.99 0.50 5.00 100 81-118 4 20 <br /> Tert-butyl alcohol 113 20 100 113 60-147 8 20 <br /> Di-isopropyl ether 5.63 1.0 5.00 113 70-125 4 20 <br /> 1,2-Dibromoethane(EDB) 4.83 0.50 5.00 97 85-125 8 20 <br /> 102-Diehl orocthane 6.00 0.50 5.00 120 77-126 3 20 <br /> 1thanol 103 100 100 103 55-200 49 20 QR-02 <br /> Ethylbenzene 5.02 0.50 5.00 100 89-122 9 20 <br /> Ethyl tcrt-butyl ether 5.26 1.0 5.00 105 71-120 2 20 <br /> Methyl tert-butyl ether 537 0.50 5.00 107 70-122 0.9 20 <br /> Toluene 4.98 0.50 5.00 100 84-119 5 20 <br /> Xylenes(total) 15.3 0.50 15.0 102 86-132 9 20 <br /> Surrogate:Dibromofluorom ethane 6.67 6.00 111 84-122 <br /> Surrogate: l,2-Drchloroethane-d4 7.32 6.00 122 74-135 <br /> Surrogate: Toluene-d8 6.20 6.00 103 84-119 <br /> Surrogate:4-Bromofluorobenzene 6.26 6.00 104 86-119 <br /> Sequoia Analyti cat-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise slated, results are reported on a wet weight <br /> 0 basis. This analytical report must be reproduced in its entirety. <br /> Page 36 of 40 <br />