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145 <br /> a— ) (707) <br /> 5 McDowBlvd North SteSequoia PPetaluma CA 9495444Analytical FAX( 792-0365 <br /> 7oT)792-0342 <br /> www sequolalabs coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/06/03 16 58 <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 3100050-EPA 5030 waters <br /> Blank(3100050-BLKI) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether ND 10 u9/1 <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 4 96 500 99 84-122 <br /> Surrogate 12-Dtchloroethane-d4 526 500 105 74-135 <br /> W.rrogate Toluene-d8 4 92 500 98 84-119 <br /> Laboratory Control Sample(3100050-BS1) Prepared&Analyzed 10/02/03 <br /> Tert-amyl methyl ether 5 37 10 ug/l 500 107 70-116 <br /> Benzene 4 84 050 500 97 81-118 <br /> Tert-butyl alcohol 128 20 100 128 62-142 <br /> Dt-isopropyl ether 5 11 10 500 102 71-121 <br /> Ethanol 141 100 100 141 65-135 Q-29 <br /> Ethylbenzene 534 050 Soo 107 89-122 <br /> Ethyl tent-butyl ether 500 10 500 100 71-110 <br /> Methyl tert-butyl ether 563 050 500 113 77-123 <br /> Toluene 566 050 Soo 113 84-119 <br /> Xylenes(total) 166 050 150 111 86-132 <br /> Surrogate Drbromofluoromethane 4 77 500 95 84-122 <br /> Surrogate 1 2-Dtchloroethane-d4 492 500 98 74-135 <br /> Surrogate Toluene-d8 520 500 104 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 13 of 16 <br />