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1455 McDowell Blvd North Ste D <br /> Sequoia Pe�l(707)792-1865 <br /> qAWAnalytical FAX(707)79 0342 <br /> scorn <br /> FAX <br /> sequoialabcoin <br /> • <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308085 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <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 3080169-EPA 5030 waters <br /> Blank(3080169-BL,KI) Prepared&Analyzed 08/09/03 <br /> Tert-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethylbenzene ND 050 " <br /> Ethyl tent-butyl ether ND 10 <br /> Methyi teff-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> urrogate Dibromofluoromelhane 4 76 450 106 84-111 <br /> Surrogate 1 2-Dichloroethane-d4 473 450 105 74-135 <br /> Surrogate Toluene-d8 480 450 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 442 450 98 86-119 <br /> Laboratory Control Sample(3080169-BS1) Prepared&Analyzed 08/09/03 <br /> Tert-amyl methyl ether 503 10 ug/l 500 101 70-116 <br /> Benzene 544 050 500 109 81-118 <br /> Tert-butyl alcohol 106 20 100 106 62-142 <br /> Di-isopropyl ether 526 10 500 105 71-121 <br /> 1,2-Dibromoethane(EDB) 555 050 500 111 92-117 <br /> 1,2-Dichloroethane 5 16 050 500 103 79-126 <br /> Ethyl tert-butyl ether 490 10 500 98 71-110 <br /> Methyi tert-butyl ether 500 050 500 100 77-123 <br /> Toluene 501 050 Soo 100 94-119 <br /> Surrogate Dibromofluoromeihane 4 73 450 105 84-721 <br /> Surrogate 12-Dichloroethane-d4 450 450 100 74-135 <br /> Surrogate Toluene-d8 4 82 450 107 84-119 <br /> Surrogate 4-Bromofluorobenzene 468 450 104 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 16 of 19 <br />