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1455 McDowell Blvd,North Ste D <br /> a— ) SequoiaPetal ma,CA 94954 <br /> 792--1865 <br /> Analytical FAX(707)792.0342 <br /> www secluoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> BTEX by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan H111 <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result °/uREC Limits RPD Limit Notes <br /> Batch 4GO7040-EPA 5030B PSI' <br /> Blank(4G07040-BLK1) Prepared&Analyzed 07/07/04 <br /> Benzene ND 050 ug/I <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12 Dichloroethane-d4 224 250 90 78-129 <br /> Laboratory Control Sample(4G07040-BS1) Prepared&Analyzed 07/07/04 <br /> Benzene 981 050 ug/l 100 98 69-124 <br /> Ethylbenzene 10 5 050 100 105 84-132 <br /> Toluene 100 0 50 100 100 78-129 <br /> Xylenes(total) 32 3 050 300 108 83-137 <br /> Surrogate 12-Drchloroethane-d4 219 250 88 78-129 <br /> boratory Control Sample(4G07040-BS2) Prepared&Analyzed 07/07/04 <br /> Benzene 489 050 ug/l 640 76 69-124 <br /> Ethylbenzene 825 050 696 119 84-132 <br /> Toluene 31 2 050 297 105 78-129 <br /> Xylenes(total) 41 1 050 33 7 122 83 137 <br /> Surrogate 12 Dichloroethane-d4 2 13 250 85 78-129 <br /> Laboratory Control Sample Dup(4G07040-ESDI) Prepared 07/07/04 Analyzed 07/08/04 <br /> Benzene 981 050 ug/l 100 98 69-124 0 20 <br /> Ethylbenzene 10 3 050 100 103 84-132 2 20 <br /> Toluene 10 3 050 10 0 103 78-129 3 20 <br /> Xylenes(total) 320 050 300 107 83-137 0 9 20 <br /> Surrogate 1 1-Dichloroethane-d4 121 2 50 88 78-129 <br /> Matrix Spike(4C07040-MS1) Source MN-F0733-06 Prepared 07/07/04 Analyzed 07/08/04 <br /> Benzene 5720 50 ug/l 640 4900 128 69-124 QM01 <br /> Ethylbenzcne 3260 50 " 696 2300 138 84-132 QM01 <br /> Toluene 3340 50 2970 82 110 78 129 <br /> Xylenes(total) 9700 50 3370 5300 131 83-137 <br /> Surrogate 1,2-D1chIoroeihane-d4 209 250 84 78-129 <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 41 <br />