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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma,CA 44954 <br /> a— —N 792-1865 <br /> ► Analytical (707 <br /> FAX(707(707)) <br /> www sequoiaiabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P309407 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm 50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P EIarth 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 Lunt Notes <br /> Batch 3100060-EPA 5030 waters <br /> Laboratory Control Sample(3100060-BSI) Prepared 10/02/03 Analyzed 10/03/03 <br /> Tert-amyl methyl ether 479 10 ug/l 500 96 70-116 <br /> Benzene 564 050 5 00 113 81-118 <br /> Tert-butyl alcohol 148 20 100 148 62-142 Q-24 <br /> Di-isopropyl ether 5 30 10 5 00 106 71-I21 <br /> Ethanol 139 100 100 139 65-135 Q-29 <br /> Ethylbenzene 546 050 500 109 89-122 <br /> Ethyl tert-butyl ether 5 14 10 5 00 103 71-110 <br /> Methyl tert-butyl ether 520 050 5 00 104 77-123 <br /> Toluene 6 02 050 500 120 84-119 Q-LIM <br /> Xylenes(total) 171 0 50 15 0 114 86-132 <br /> Surrogate Dibromofluoromethane 616 600 103 84-121 <br /> OSurrogate 1 2-Dichloroethane-d4 520 6 00 87 74-135 <br /> urrogate Toluene-d8 6 33 600 106 84-119 <br /> Laboratory Control Sample Dup(3100060-BSD1) Prepared 10/02/03 Analyzed 10/03/03 <br /> Tert-amyl methyl ether 4 84 10 ug/i 5 00 97 70-116 1 20 <br /> Benzene 564 050 500 113 81-118 0 20 <br /> Tert-butyl alcohol 154 20 100 154 62-142 4 20 Q-29 <br /> Di isopropyl ether 529 10 500 106 71-121 02 20 <br /> Ethanol 183 100 100 183 65-135 27 20 Q-29 <br /> Ethylbenzene 558 050 500 112 89-122 2 20 <br /> Ethyl tert-butyl ether 523 1 0 5 00 105 71-110 2 20 <br /> Methyl tent-butyl ether 5 38 050 5 00 108 77-123 3 20 <br /> Toluene 610 050 500 122 84-119 1 20 Q-LIM <br /> Xylenes(total) 169 050 15 0 113 86-132 I 20 <br /> Surrogate Dibromofluoromethane 617 600 103 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 537 600 90 74-135 <br /> Surrogate Toluene-d8 627 600 104 84-119 <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 15 of 16 <br />