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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> Is <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P407056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 37 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Malyte Result Limit Units Level Result %REG Lunits RPD Limit Notes <br /> Batch 4070265-EPA 5030B waters <br /> Matrix Spike(4070265-MSI) Source P407064-02 Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether 2600 500 ug/l 2500 ND 104 78-117 <br /> Benzene 2740 250 2500 ND 110 81-118 <br /> Tert-butyl alcohol 60700 10000 50000 ND 121 60-147 <br /> Di-isopropyl ether 2960 S00 2500 ND 118 70-125 <br /> 1,2-Dibromoethane(EDB) 2760 250 2500 ND 110 85-125 <br /> 1 2-Dichloroethane 3050 250 2500 ND 122 77-126 <br /> Ethanol 69700 50000 50000 ND 139 55-200 <br /> Ethylbenzene 2800 250 2500 ND 112 89-122 <br /> Ethyl tent-butyl ether 2730 500 2500 ND 109 71-120 <br /> Methyl tert butyl ether 18500 250 2500 15000 140 70-122 QM04 <br /> Toluene 2760 250 " 2500 ND 110 84-119 <br /> ,,I&lenes(total) 8430 250 7500 ND 112 86-132 <br /> rrogate Dibromofluoromethane 4 77 4 00 119 84 122 <br /> Surrogate 12-Dichloroethane-d4 514 400 128 74-135 <br /> Surrogate Toluene-d8 449 4 00 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 450 400 111 86-119 <br /> Matrix Spike Dup(4070265-MSDI) Source P407064-02 Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether 2540 500 ug/l 2500 ND 102 78-117 2 20 <br /> Benzene 2560 250 2500 ND 102 81-118 7 20 <br /> Tert-butyl alcohol 67700 10000 50000 ND 135 60-147 11 20 <br /> Di isopropyl ether 2820 500 2500 ND 113 70-125 5 20 <br /> 1 2-Dibromoethane(EDB) 2660 250 2500 ND 106 85-125 4 20 <br /> 1,2-Dichloroethane 2890 250 2500 ND 146 77-126 5 20 <br /> Ethanol 84100 50000 50000 ND 168 55-200 19 20 <br /> Ethylbeirzene 2640 250 2500 ND 106 89-122 6 20 <br /> Ethyl ten-butyl ether 2640 500 2500 ND 106 71-120 3 20 <br /> Methyl tert-butyl ether 17400 250 2500 15000 96 70-122 6 20 <br /> Toluene 2650 250 2500 ND 106 84-119 4 20 <br /> Xylenes(total) 8050 250 7500 ND 107 86-132 5 20 <br /> Surrogate Dibrorno luoromethane 469 400 117 84-122 <br /> Surrogate I 1-Dichloroethane-d4 487 4 OO 122 74-135 <br /> Surrogate Toluene-d8 444 400 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 436 400 109 86-119 <br /> Sequoia Analyttcal-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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 12 <br />