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r� <br /> rt <br /> 1455 McDowell Blvd Horth Ste D <br /> Sequoia Petaluma, 94454 <br /> (707)7979 2-1865 <br /> ► Analytical Uqu7}792-0342 <br /> www seyuoiakabs com <br /> (is <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/09/04 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 3120744-EPA 5030B waters <br /> Laboratory Control Sample Dup(3120744-BSDI) Prepared&Analyzed 12/29/03 <br /> Tert-amyl methyl ether 527 1 0 ug/1 500 105 78-117 2 20 <br /> Benzene 5 10 050 " 500 102 81-118 0 2 20 <br /> Tert-butyl alcohol 106 20 100 106 60-147 4 20 <br /> Di-isopropyl ether 545 10 5 00 109 70-125 5 20 <br /> 1 2-Dibromoethane(EDB) 4 91 050 500 98 85-125 0 6 20 <br /> 1 2-Dichloroethane 537 050 500 107 77-126 1 20 <br /> Ethanol 117 100 l00 117 55-200 34 20 QR-07 <br /> Ethylbenzene 498 0 50 500 100 89-122 2 20 <br /> Ethyl tert-butyi ether 5 20 10 500 104 71-120 2 20 <br /> Methyl tert-butyl ether 546 0 50 500 109 70-122 1 20 <br /> Toluene 4 98 050 500 100 84-119 3 20 <br /> lenes(total) 15 5 0 50 15 0 103 86-132 1 20 <br /> arrogate Drbromofluoromelhane 656 600 109 84-122 <br /> Surrogate 12-Dichloroethane-d4 637 600 106 74 135 <br /> Surrogate Toluene d8 622 6 00 104 84-119 <br /> Surrogate 4 Bromofluorobenzene 617 600 103 86-119 <br /> equoia 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 wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 17 <br />