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a— ) <br /> 1455 Mdlowefl Blvd NorthSteSequoia Peta3 uma,CA 949544 <br /> 4 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P403322 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 03/27/04 16 33 <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 4030678-EPA 5030B waters <br /> Matrix Spike(4030678-MSI) Source P403351-01 Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether 666 10 ug/I 500 ND 133 78-117 QM01 <br /> Benzene 636 50 500 12 125 81-H8 QM01 <br /> Tert-butyl alcohol 1210 200 1000 ND 121 60-147 <br /> Di-isopropyl ether 768 10 Soo ND 154 70-125 QM01 <br /> 1 2-Dibrommthane(EDB) 637 50 500 ND 127 85-125 QM01 <br /> 1,2 Dichloroethane 716 so 500 ND 143 77-126 QM01 <br /> Ethanol 1160 1000 1000 ND 116 55-200 <br /> Ethylbenzene 577 50 500 ND 115 89-122 <br /> Ethyl tert-butyl ether 723 10 500 ND 145 71-120 QM01 <br /> Methyl tert-butyl ether 273 50 500 200 146 70-122 QM04 <br /> Toluene 616 so Soo 17 120 84-119 QM01 <br /> Amm&Xylenes(total) 181 so 150 ND 121 86-132 <br /> tu'rogate Dibromofluoromethane 604 500 121 84-122 <br /> Surrogate 12-Drchloroethane-d4 696 .500 139 74-135 QM01 <br /> Surrogate Toluene-d8 522 .500 104 84-119 <br /> Surrogate 4-Bromofluorobenzene S66 " 500 113 86-119 <br /> Matrix Spike Dup(4030678-MSD1) Source P403351-01 Prepared&Analyzed 03/24/04 <br /> Tert-amyl methyl ether 638 10 uSA 500 ND 128 78-117 4 20 QM01 <br /> Benzene 59 4 50 500 12 116 81-118 7 20 <br /> Tert-butyl alcohol 1100 200 1000 ND 110 60-147 10 20 <br /> Di-isopropyl ether 708 10 50 0 ND 142 70-125 8 20 QM01 <br /> 1 2-Dibromoethane(EDB) 592 5 0 50 0 ND 118 85-125 7 20 <br /> 1,2-Dichloroethane 674 50 500 ND 135 77-126 6 20 QM01 <br /> Ethanol 1100 1000 1000 ND 110 55-200 5 20 <br /> Ethylbenzene 559 5 0 500 ND 112 89-122 3 20 <br /> Ethyl tert-butyl ether 669 10 500 ND 134 71-120 8 20 QM01 <br /> Methyl tent butyl ether 244 5 0 500 200 88 70-122 11 20 <br /> Toluene 56 3 50 500 17 109 84-119 9 20 <br /> Xylenes(total) 172 50 150 ND 115 86 132 5 20 <br /> Surrogate Dibromofluoromethane 5 74 500 115 84-112 <br /> Surrogate 1 2-Drchloroethane-d4 655 500 131 74-135 <br /> Surrogate Toluene-d8 496 500 99 84-119 <br /> Surrogate 4 Bromofluorobenzene 548 500 110 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chart 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 5 of 6 <br />