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.1 <br /> 1455 McDowell Blvd North Ste D <br /> i�D Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> qW Analytical <br /> FAX(707)792-0342 <br /> . www sequoialabs com <br /> URS Corp-Sacramento Project BP Ventage Site 11191,Stockton,Ca P401434 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/11/04 I6 10 <br /> Volatile Organic Compounds 6y EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limps RPD Limit Notes <br /> Batch 4020167-EPA 5030B waters <br /> Matrix Spike(4020167-MSI) Source P401433-12 Prepared 02/06/04 Analyzed 02/07/04 <br /> Tert-amyl methyl ether 944 20 ug11 140 ND 94 78-117 <br /> Benzene 984 10 100 10 88 81-118 <br /> Tert-butyl alcohol 2090 400 2000 ND 104 60-147 <br /> Di-isopropyl ether 978 20 100 ND 98 70-125 <br /> Ethanol 1460 2000 2000 ND 73 55-200 <br /> Ethylbenzene 126 10 100 35 91 89-122 <br /> Ethyl tert-butyl ether 929 20 100 ND 93 71-120 <br /> Methyl Cert-butyl ether 106 10 100 3 6 102 70-122 <br /> Toluene 835 10 100 20 82 84-119 Q-LII <br /> Xylenes(total) 285 10 300 ND 95 86-132 <br /> Surrogate DibromoJluoromethane 623 600 104 84-122 <br /> Wrrogate 1 1-Dichloroethane-d4 625 600 104 74-135 <br /> Surrogate Toluene-d8 591 600 98 84-119 <br /> Matrix Spike Dup(4020167-MSDI) Source P401433-12 Prepared 02/06/04 Analyzed 02/07/04 <br /> Teri-amyl methyl ether 958 20 ug/l 100 ND 96 78-117 1 20 <br /> Benzene 103 10 ]00 10 93 81-118 5 20 <br /> Tert-butyl alcohol 2730 400 2000 ND 136 60-147 27 20 QR-02 <br /> De-isopropyl ether 959 20 100 ND 96 70-125 2 20 <br /> Ethanol 3140 2000 2000 ND 157 55-200 73 20 QR 02 <br /> Ethylbenzene 13I 10 100 35 96 89-122 4 20 <br /> Ethyl tert-butyl ether 927 20 100 ND 93 71-120 0 2 20 <br /> Methyl tert-butyl ether 102 10 100 3 6 98 70-122 4 20 <br /> Toluene 878 10 100 20 86 84-119 5 20 <br /> Xylenes(total) 299 10 300 ND 100 86-132 5 20 <br /> Surrogate Dibromojluoromethane 6 12 600 102 84-122 <br /> Surrogate 12-Drchloroethane-d4 6 01 600 100 74-135 <br /> Surrogate Toluene-d8 595 600 99 84-119 <br /> ,Sequoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 10 of 14 <br />