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Sequoia 1455 McDowell Blvd,North Ste <br /> Petaluma,CA 949544 <br /> Analytical <br /> (707)792 1865 <br /> FAX(707)792-0342 <br /> www sequolalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P412423 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01111111 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units bevel Result %REC limits RPD Limit Notes <br /> Batch 5010108-EPA 5030B waters/EPA 8260B <br /> Laboratory Contra]Sample Dup(5010108-BSD]) Prepared&Analyzed 01/09/05 <br /> Tert-amyl methyl ether 522 10 ugA 500 104 78-117 08 20 <br /> Benzene 479 0 50 500 96 81-118 4 20 <br /> Tert-butyl alcohol as 9 20 i0o 89 60-147 02 20 <br /> Drtsopropyl ether 525 10 500 105 70-125 08 20 <br /> 1 2-Dichloroethane 547 050 500 109 77-126 3 20 <br /> Ethanol 94 0 100 100 94 55-200 6 20 <br /> Ethylbenzene 483 050 500 97 89-122 08 20 <br /> Ethyl tert-butyl ether 490 1 0 500 98 71-120 l 20 <br /> Methyl tert-butyl ether 5 15 050 500 103 70-122 0 8 20 <br /> Toluene 4 73 050 500 95 84-119 3 20 <br /> Xylenes(total) 14 5 0 50 15 0 97 86-132 2 20 <br /> Surrogate DibromofTuoromethane 500 Soo 100 84-122 <br /> surrogate 1 2-Dichloroethane-d4 547 I, S 00 109 74-135 <br /> Surrogate Toluene-d8 518 5 00 104 84-119 <br /> Surrogate 4-Bromofluorobenzene 487 5 00 97 86-119 <br /> Batch 5010120-EPA 5030B waters/EPA 8260B <br /> Blank(5010120-BLKI) Prepared&Analyzed 01/10/05 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 050 " <br /> Cert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> 2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Drbromofluoromethane 522 5 00 104 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 527 5 00 105 74-135 <br /> Surrogate Toluene-d8 527 5 00 105 84-119 <br /> Surrogate 4 Bromofluorobenzene 527 5 00 105 86-119 <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 to its entirety <br /> Page 26 of 33 <br />