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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA94954 <br /> ~` ►'� Analytical (707)79792-1865 <br /> FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P504013 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0164 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04114105 16 07 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source "/oREC RPD <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Limit Notes <br /> Batch 5040114-EPA 5030B waters/EPA 8260B <br /> Laboratory Control Sample Dup(5040114-BSDl) Prepared&Analyzed 04/13/05 <br /> Tert-amyl methyl ether 540 10 ugll 500 108 78-117 8 20 <br /> Benzene 5 11 050 500 102 81-118 6 20 <br /> Tert-butyl alcohol 923 20 100 92 60-147 1 20 <br /> Di-isopropyl ether 544 1 0 Soo 109 70-125 5 20 <br /> 1 2-Dibromoethane(EDB) 5 14 050 500 103 85-125 4 20 <br /> 1,2-Dichloroethane 499 050 Soo 100 77-126 7 20 <br /> Ethanol 117 100 100 117 55-200 37 20 RB <br /> Ethylbenzene 521 050 5 00 104 89-122 3 20 <br /> Ethyl tert-butyl ether 522 10 500 104 71-120 7 20 <br /> Methyl tert-butyl ether 567 050 Soo 113 70-122 13 20 <br /> Toluene 5 10 050 500 102 84-119 4 20 <br /> Xylenes(total) 160 050 150 107 86-132 3 20 <br /> urrogaie Dibromofluoromethane 479 5 00 96 84-122 <br /> Surrogate 12 Dichloroethane-d4 463 500 93 74-135 <br /> Surrogate Toluene-d8 481 500 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 527 500 105 86-119 <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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 19 of 20 <br />