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.1 <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> WWW sequotalabs com <br /> • <br /> I <br /> URS Corp-Sacramento Protect 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 10/16/0311 59 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Souice %REC RPD <br /> Analyle Result Lunn Units Level Result %REC Limps RPD Limit Notes <br /> Batch 3100167-EPA 5030 waters <br /> Laboratory Control Sample Dup(3100167-BSDI) Prepared&Analyzed 10/08/03 <br /> Tert-amyl methyl ether µ 507 1 0 ug/l Soo 101 70-116 4 20 <br /> Benzene 510 050 500 102 81-118 2 20 <br /> Tert-butyl alcohol 106 20 100 106 62-142 20 20 <br /> Di-isopropyl ether 5 10 10 500 102 71-121 4 20 <br /> Ethanol 116 100 100 116 65-135 29 20 Q-29 <br /> Ethylbenzene 540 050 500 108 89-122 6 20 <br /> Ethyl tert-butyl ether 5 17 to 500 103 71-110 5 20 <br /> Methyl ten-butyl ether 5 11 050 500 102 77-123 3 20 <br /> Toluene 481 050 500 96 84-119 5 20 <br /> Xylenes(total) 161 050 150 107 86-132 4 20 <br /> Surrogate Dibromofluoromethane 637 600 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 635 600 106 74-135 <br /> Ourrogate Toluene-d8 615 600 102 84-119 <br /> I <br /> I <br /> I <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 29 of 30 <br />