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1455 McDowell Blvd,North Ste A <br /> Sequoia Petaluma,CA 94954 <br /> ' s (707)792-1865 <br /> 07) 342 <br /> Analytical www scquoiala6s com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P309471 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 59 <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 %RFC Limits RPD Limit Notes <br /> Batch 3100167-EPA 5030 waters <br /> Blank(3104167-BLK3) Prepared&Analyzed 10/08/03 <br /> Tert-amyl methyl ether ND 1 0 UO <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 cert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 608 600 101 84-122 <br /> Surrogate 12-Dichloroelhane-d4 610 600 103 74-135 <br /> ourrogate Toluene-d8 616 600 103 84-119 <br /> Laboratory Control Sample(3100167-BS1) Prepared&Analyzed 10/08/03 <br /> Teri-amyl methyl ether 485 10 ug/l 500 97 70-116 <br /> Benzene 498 050 500 100 81-118 <br /> Tert-butyl alcohol 869 20 100 87 62-142 <br /> Di-isopropyl ether 489 1 0 500 98 71-121 <br /> Ethanal 869 100 100 87 65-135 <br /> Ethylbenzene 508 050 500 102 89-122 <br /> Ethyl tert-butyl ether 494 1 0 500 99 71-110 <br /> Methyl tert-butyl ether 494 050 500 99 77-123 <br /> Toluene 456 050 500 91 84-119 <br /> Xylenes(total) 154 050 150 103 86-132 <br /> Surrogate Drbromofluoromethane 644 600 107 84-122 <br /> Surrogate 11-Dichlaroethane-d4 629 600 105 74-135 <br /> Surrogate Toluene-d8 624 600 104 84-119 <br /> Sequoia Analytical-Petaluma The results m this report apply to the samples analyzed in accordance with the chant 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 28 of 30 <br />