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e Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical (707)792.1365 <br /> FAX(707)792-0342 <br /> ' www sequoialabs.com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number 1ntrim-50293 Reported: <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Volatile Organic Compounds by EPA Method 8260E- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reportmg Spilka Source %REC RPD <br /> Analyte Result Lunt Units Level Result %REC Lunits RPD Lumt Notes <br /> Batch 3060661 -EPA 5030 waters <br /> Laboratory Control Sam le Dv (3060661-BSD1) Prepared 06/25/03 Analyzed 06/26/03 <br /> Tert amyl methyl ether 489 10 ug/l 500 98 70-116 6 20 <br /> Tett-butyl alcohol 926 20 " 100 93 62-142 15 20 <br /> Di-isopropyl ether 481 10 500 96 71-121 7 20 <br /> Ethyl tert-butyl ether 467 10 500 93 71-110 09 20 <br /> Methyl tert butyl ether 379 050 500 76 77-123 1 20 Q-LM4 <br /> Surrogate Dibromofluoromethane 424 450 94 84-122 <br /> Surrogate 12-Dichloroerhane-d4 397 450 88 74-135 <br /> Surrogate Toluene-8 468 " 450 104 84-119 <br /> nota 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 26 of 27 <br />