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1455 McDowell Blvd Ste <br /> Sequoia Petaluma CA CA 949544 <br /> lz� <br /> Analytical (707) 5 <br /> FAX(707)742-0342 <br /> { www sequoialabsbs oocoin <br /> URS Corp-Sacramento Project Arco Site 2186,StoOcton,CA P312396 <br /> 2870 Gateway Oaks Drive Suite 300 ProlectNumber 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 Resuh Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3120744-EPA 5030B waters <br /> Blank(3120744-BLK1) Prepared&Analyzed I2129/03 <br /> Tert-amyl methyl ether ND to ugll <br /> Benzene ND 050 " <br /> Ten butyl alcohol ND 20 " <br /> Dt-isopropyl ether ND to " <br /> 12-Dibromoethane(EDB) ND 050 " <br /> 1 2-Dichloroethane ND 050 <br /> Ethanol ND 100 <br /> Ethylberizene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> �ylenes([Dial} ND 050 " <br /> Surrogate Drbromofluoromethane 669 600 112 84-122 <br /> Surrogate 1 2-Dichloroethune d4 629 600 105 74-135 <br /> Surrogate Toluene-d8 616 600 103 84-119 <br /> Surrogate 4 Bromofluorobenzene 624 600 104 86-119 <br /> Laboratory Control Sample(3120744-BSI) Prepared&Analyzed 12/29/03 <br /> Tert amyl methyl ether 5 14 1 0 ug/I Soo 103 78-117 <br /> Benzene 509 050 500 102 81-118 <br /> Tert-butyl alcohol 110 20 100 110 60-147 <br /> Di-isopropyl ether 572 10 500 114 70-125 <br /> 1 2-Dibromoethane(FDB) 494 050 500 99 85-125 <br /> 1 2-Dichloroethane 545 050 500 109 77-126 <br /> Ethanol 165 100 100 165 55-200 <br /> Ethylbenzene 508 050 500 102 89-122 <br /> Ethyl tert-butyl ether 529 10 500 106 71-120 <br /> Methyl ten-butyl ether 554 050 500 111 70-122 <br /> Toluene 5 11 050 500 102 84-119 <br /> Xylenes(total) 157 050 150 105 66-132 <br /> Surrogate Dibromofluoromethane 659 600 110 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 617 600 103 74-135 <br /> Surrogate Toluene-d8 622 600 104 84-119 <br /> Surrogate 4-Bromofluorobewene 6 12 600 102 86-119 <br /> ,eequola 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 to its entirety <br /> Page 15 of 17 <br />