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1455 McDowell Blvd North Ste D <br /> a— ) Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P406072 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/17/04 17 27 <br /> BTEX by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lima Notes <br /> Batch 4F14005-EPA 5030B P/T <br /> Blank(4F14005-BLK1) Prepared&Analyzed 06/14/04 <br /> Benzene ND 050 ug/1 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1 2-Dichloroethane-d4 580 500 116 78-129 <br /> Laboratory Control Sample(4F14005-BSI) Prepared&Analyzed 06/14/04 <br /> Benzene 853 050 ug/l 100 853 69-124 <br /> Toluene 9 14 050 100 91 4 78-129 <br /> Ethylbenzene 996 050 100 996 84-132 <br /> Xylenes(total) 301 050 300 100 83-137 <br /> l6urrogate 12-Dichloroethane-d4 619 500 124 78-129 <br /> aboratory Control Sample Dup(4F14005-BSDI) Prepared&Analyzed 06/14/04 <br /> Benzene 890 050 ugfl 100 890 69-124 425 20 <br /> Toluene 968 050 too 968 78-129 574 20 <br /> Ethylbenzene 105 050 too 105 84-132 528 20 <br /> Xylenes(total) 32 0 050 300 107 83-137 6 12 20 <br /> Surrogate 1 2-Dichloroethane-d4 606 Soo 121 78-129 <br /> Matrix Spike(4F14005-MSI) Source MNF0284-03 Prepared 06/14/04 Analyzed 06/15/04 <br /> Benzene 2640 50 ug/1 1000 1700 94 0 69-124 <br /> Toluene 1040 50 1000 49 991 78-129 <br /> Ethylbenzene 1210 50 1000 I10 110 84-132 <br /> Xylenes(total) 3420 50 3000 130 110 83-137 <br /> Surrogate 12-Dichloroethane-d4 5 76 500 115 78-129 <br /> Matrix Spike Dup(4F14005-MSD1) Source MNF0284-03 Prepared 06/14/04 Analyzed 06/15/04 <br /> Benzene 2480 50 ug/1 1000 1700 78 0 69-124 625 20 <br /> Toluene 995 50 1000 49 94 6 78-129 442 20 <br /> Ethylbcnzene 1160 50 1000 110 105 84-132 4 22 20 <br /> Xylenes(total) 3280 50 3000 130 105 83-137 4 18 20 <br /> Surrogate 12-Dichloroethane-d4 542 500 108 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 7 of 11 <br />