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r � <br /> ® <br /> Sequoia I455McDowell Blvd North Ste 4 Petaluma CA 94954 <br /> (707)792-1863 <br /> Analytical <br /> FAX(707)792 0342 <br /> www sequoialabs co� <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P505€20 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0287 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 05/19/05 11 20 <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 %REC Limits RPD Limit- Notes <br /> Batch 5050092 - EPA 5030B waters/EPA 8260B <br /> Blank(5050092-BLKl) Prepared&Analyzed 03/17/05 <br /> Tert-amvl methyl ether ND 024 ppmv <br /> Tert-amyl methyl ether ND 1 0 mg/m'Air <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Tert-butyl alcohol ND 66 " <br /> Tert-butyl alcohol ND 20 mg/ml Air <br /> Di-isopropyl ether ND 1 0 ' <br /> Di-tsopropyl ether ND 0 24 ppmv <br /> Ethylbenzene ND 0 A mg/m'Air <br /> Ethylbenzene ND 012 ppmv <br /> Ethyl tert-butyl ether ND 1 0 mg/ml Air <br /> Ethyl tent-butyl ether ND 024 ppmv <br /> Methyl tert-butyl ether ND 0 14 " <br /> Methyi Cert-butyl ether ND 050 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 050 mg/m'Air <br /> Xyienes(total) _ — ND - 0 12—-ppmv - - - — - <br /> Xylenes(total) ND 0 50 mg/m'Air <br /> Surrogate Dibrornafluoramethane 535 Soo 107 84-122 <br /> Surrogate Dibromofluoromethane 0 682 ppmv 0 638 107 84-121 <br /> Surrogate I2-DichloroeMane-d4 14U " 119 118 74-135 <br /> Surrogate 12-Drchloroethane-d4 589 mgim'Air 500 118 74-135 <br /> Surrogate Toluene-d8 111 ppmv 121 92 84-119 <br /> Surrogate Toluene-& 4 58 mg/m'Air 500 92 84-119 <br /> Laboratory Control Sample(5050092-BSI) Prepared&Analyzed 05/17/05 <br /> Tert amyl methyl ether 508 1 0 mg/m'Air Soo 102 78-117 <br /> Tert-amyl methyl ether 122 0 24 ppmv 120 102 78-117 <br /> Benzene 441 050 maW Air 500 88 - 81-118 <br /> Benzene 138 016 ppmv 157 88 81-118 <br /> Tert-butyl alcohol _ _ _ _ 995 20_ mg/ml Air 100 _ _100 _ 60 147 <br /> Tert-butyl alcohol 329 6 6 ppmv 33 l 99 60-147 <br /> Di-isopropvl ether 6 03 1 0 mg/ml air 500 121 70-125 <br /> -Di-isopropvi ether - - - —- - 145-- - 0 24 ppmv -- -1-20 — 121-- 70-125- - - - — - — <br /> Ethyibenzerte 464 0 50 mglm'Air 500 93 89-122 <br /> Ethylbenzcne 107 012 ppmv 1 15 93 89-122 <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 as entirety <br /> Page 8 of 11 <br />