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1455 McDowell Blvd North Ste <br /> 4D Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical FAX(707) 42 <br /> www sequotalabs labs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P309344 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 45 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Repotting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3090663-EPA 5030 waters <br /> Laboratory Control Sample Du (3090663-BSDI) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether 490 10 ugll 500 98 70-116 7 20 <br /> Benzene 548 050 500 110 81-118 8 20 <br /> Tert-butyl alcohol 133 20 t00 133 62-142 12 20 <br /> Di-tsopropyl ether 535 10 500 107 71-121 7 20 <br /> 1,2-Dtbromoethane(EDB) 485 050 500 97 !)2-117 3 20 <br /> 1,2-Dtchloroethane 553 050 500 111 79-126 9 20 <br /> Ethanol 132 100 t00 132 65-135 12 20 <br /> Ethylhenzene 518 050 500 104 89-122 10 20 <br /> Ethyl tert-butyl ether 525 ] a 500 105 71-110 6 20 <br /> Methyl tert-butyl ether 540 050 500 108 77-123 4 20 <br /> Toluene 556 050 500 Ill 84-1 l9 10 20 <br /> Xylenes(total) 155 050 150 103 86-132 9 20 <br /> urrogate Dibromofluoromethane 676 600 113 84-122 <br /> Surrogate 12-Dichloroethane-d4 567 600 94 74-135 <br /> Surrogate Toluene-d8 636 600 106 84-119 <br /> Surrogate 4-Bromofluorobenzene 575 600 96 86-119 <br /> Batch 3090671 -EPA 5030 waters <br /> Blank(3090671-BLK1) Prepared&Analyzed 09/30/03 <br /> Tert-amyl methyl ether ND 10 ugll <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 1,2-Dtbromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <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 540 Soo 108 84-122 <br /> Surrogate 12-Dtchloroethane-d4 568 500 114 74-135 <br /> Surrogate Toluene-d8 484 500 97 84-119 <br /> Surrogate 4-8romofluorobenzene 505 500 101 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the churn 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 15 <br />