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Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> a (707)792-1865 <br /> �► Analytical FAX(707)792-0342 <br /> WWW sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P312737 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/13/04 19 10 <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 Level Result %RFC Limits RPD Limit Notes <br /> Batch 4010065-EPA 50308 waters <br /> Laboratory Control Sample Du (4010065-BSD1) P ared&Anal zed 01/07/04 <br /> Tert-amyl methyl ether 502 1 0 ugll 500 100 78-117 2 20 <br /> Benzene 4 88 0 50 500 98 81-118 3 20 <br /> Tert-butyl alcohol 107 20 100 107 60-147 4 20 <br /> Di-isopropyl ether 5 06 1 0 5 00 101 70-125 5 20 <br /> Ethanol 996 100 100 100 55-200 2 20 <br /> Ethylbenzene 5 06 050 5 00 I01 89-122 3 20 <br /> Ethyl tert butyl ether 4 84 1 0 500 97 71 120 2 20 <br /> Methyl tert-butyl ether 497 050 500 99 70-122 0 8 20 <br /> Toluene 499 0 50 Soo 100 84-119 0 6 20 <br /> Xylenes(total) 154 0 50 150 103 86-132 3 20 <br /> iSurrogate Dihromofluoromethane 632 600 105 84-122 <br /> Surrogate 1 2 Dichloroelhane-d4 6 12 600 102 74-135 <br /> Surrogate Toluene-d8 6 19 600 103 84-119 <br /> �equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> ajcuslody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 9 of 10 <br />