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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 corn <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-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 Hill <br /> Reporting Spice Source %REC RPD <br /> Analyte Result Lamd Units Level Result o/9"C Limits RPD Limit Notes <br /> Batch 4GO7003-EPA 5030B PCT <br /> _Blank(4G07003-BLKI) Prepared&Analyzed 07/07/04 <br /> Benzene ND 050 ug/1 <br /> Ethylbenzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12 Dichlaroethane-d4 517 500 103 78-129 <br /> Laboratory Control Sample(4G07003-BSI) Prepared&Analyzed 07/07/04 <br /> Benzene 109 050 ug/I 100 109 69-124 <br /> Ethylbenzene 11 1 050 100 111 84-132 <br /> Toluene 119 050 100 119 78-129 <br /> Xylenes(total) 328 0 50 300 109 83-137 <br /> Surrogate 12 Dichloroethane d4 499 500 100 78-119 <br /> 10 atrix Spike(4G07003-MSI) Source P406495-01 Prepared&Analyzed 07/07/04 <br /> Benzene 110 050 ug/I 100 ND 110 69-124 <br /> Ethylbcnzene 987 0 50 100 ND 99 84-132 <br /> Toluene 115 050 100 ND 115 78-129 <br /> Xylenes(total) 250 050 300 ND 83 83-137 <br /> Surrogate 12 Dichloroethane-d4 580 500 116 78-129 <br /> Matrix Spike Dup(4G07003-MSD1) Source P406495-01 Prepared&Analyzed 07/07/04 <br /> Benzene 10 8 050 ug/I 10 0 ND 108 69-124 2 20 <br /> Ethylbenzene 108 050 100 ND 108 84-132 9 20 <br /> Toluene 114 050 " too ND 119 78-129 3 20 <br /> Xylenes(total) 312 050 300 ND 104 83-137 22 20 QC21 <br /> Surrogate 1 2-Dichloroethane-d4 571 500 114 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 27 of 41 <br />