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Sequoia 1885 Jarvis Drive <br /> Morgan Hilll CCA 95037037 <br /> Z— (408)776-96W <br /> Analytical FAX(408)782-6308 <br /> www sequwalabs cam <br /> URS Corporation[Arco]] Project ARCO#2130,Stockton,CA MOF0835 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/07/05 12 24 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmnt Units Level Result %REC Dimts RPD Limit Notes <br /> Batch 5F29002-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(5F29002-BSD2) Prepared&Analyzed 06/29/05 <br /> Benzene 526 050 ugA 608 87 65-115 21 20 RB <br /> Ethylbenzene 785 050 784 100 75-135 20 I5 RB <br /> Methyl tent-butyl ether 795 050 960 83 65-125 22 20 RB <br /> Toluene 310 050 329 94 85-120 19 20 <br /> Xylenes(total) 384 050 385 100 85-125 20 20 <br /> Gasoline Range Organics(C4-C12) 375 50 440 85 70-124 25 20 RB <br /> Surrogate 12 Dichloroethane-d4 209 150 84 60-135 <br /> Matrix Spike(5F29002-MSI) Source MOF0835-18 Prepared&Analyzed 06/29/05 <br /> Benzene 6 26 050 ugA 608 1 5 78 65-115 <br /> Ethylbenzene 7 73 050 7 84 046 93 75-135 <br /> Methyl cert-butyl ether 7 13 050 960 0 060 74 65-125 <br /> �Toluene 298 050 329 12 87 85-120 <br /> ylenes(total) 376 050 385 19 93 85-125 <br /> Gasoline Range Organics(C4-C12) 545 50 440 200 78 70-124 <br /> Surrogate 12-Dichloroethane-d4 206 250 82 60-135 <br /> Matnx Spike Dup(5F29002-MSDI) Source MOF0835-18 Prepared&Analyzed 06/29/05 <br /> Benzene 7 63 050 ugA 608 1 5 101 65-115 20 20 <br /> Ethylbenzene 832 050 7 84 046 100 75-135 7 15 <br /> Methyl tent-butyl ether 759 050 960 0 060 78 65-125 6 20 <br /> Toluene 322 050 329 1 2 94 85-120 8 20 <br /> Xylenes(total) 404 050 385 19 100 85-125 7 20 <br /> Gasoline Range Organics(C4-C12) 525 50 440 200 74 70-124 4 20 <br /> Surrogate 12-Dichloroelhane-d4 209 150 84 60-135 <br /> Batch 5F30006-EPA 5030B PIT/EPA 8260B <br /> Blank(5F30006-BLKI) Prepared&.Analyzed 06/30/05 <br /> tert-Amyl methyl ether ND 050 u&A <br /> Benzene ND 050 " <br /> tert Butyl alcohol ND 5 0 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> i <br /> Sequoia Analytical-Morgan Hill 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 17 of 21 <br />