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1455 McDowell Blvd,North Ste D <br /> (D Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> i <br /> URS Corp-Sacramento project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrirn-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <br /> BTEX by EPA Method 8260B - Quality Control <br /> Sequoia Analyt"l W Morgan Hill <br /> Reporting Spike Source °/6REC RPD <br /> Analyte Result Limit Units Level Result %REC L'm'ts RPD Limit Notes <br /> Batch 4FO7003-EPA 5030B PIF <br /> Blank(4F07003-BLKI) Prepared&Analyzed 06/07/04 <br /> Benzene ND 050 ug/1 <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1 2-Dichloroethane44 584 500 117 78-179 <br /> Laboratory Control Sample(4F07003-BSI) Prepared&Analyzed 06/07/04 <br /> Benzene 948 050 ug/l 10 0 94 8 69-I24 <br /> Toluene 853 050 100 853 78-129 <br /> Ethylbenzene 933 050 100 933 84-132 <br /> Xylenes(total) 275 050 300 91 7 83-137 <br /> W <br /> urrogate 12 Dichloroethane-d4 557 Soo 111 78-129 <br /> aboratory Control Sample(4F07003-BS2) Prepared&Analyzed 06/07/04 <br /> Benzene 504 050 ug/l 640 789 69-124 <br /> Toluene 304 050 297 102 78-129 <br /> Ethylbenzene 784 050 696 113 84-132 <br /> Xylenes(total) 36 5 050 337 108 83-137 <br /> Surrogate 12-Dichloroethane-d4 538 500 108 78-129 <br /> Laboratory Control Sample Dup(4F07003-BSD1) Prepared&Analyzed 06/07/04 <br /> Benzene 986 050 ug/l 100 98 6 69-124 393 20 <br /> Toluene 932 050 100 93 2 78-129 885 20 <br /> Ethylbenzene 954 050 100 954 84-132 2 23 20 <br /> Xylenes(total) 285 050 300 950 83-137 357 20 <br /> Surrogate l 2-Dichloroethane-d4 567 500 113 78-129 <br /> Matrix Spike(4F07003-MS1) Source MNED696-011 Prepared 06/07/04 Analyzed 06/08/04 <br /> Benzene 563 50 ug/1 640 go 867 69-124 <br /> Toluene 3170 50 2970 13 106 78-129 <br /> Ethylbenzene 759 50 696 ND 109 84-132 <br /> Xylenes(total) 3740 50 3370 ND 111 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 584 500 117 78-129 <br /> Sequoia Analytical-Petaluma Ae results in this report apply to the samples analyzed in accordance with the chain of <br /> • custody document Unless otherwise stated results are reported an a wet weight bas's <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 20 <br />