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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma 7991955 <br /> `1 (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> FAX <br /> sequmalabs com <br /> • <br /> URS Corp- Sacramento Project Arco Site 6100,Tracy,CA P410118 <br /> 2870 Gateway Oaks Drive Suite 300 Project Plumber WR36619 Reported <br /> Sacramento CA, 95833 Project Manager Jay Johnson 10/11/04 15 36 <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 4100135- EPA 5030B waters/EPA 8260B <br /> Blank(4100135-BLK1) Prepared&Analyzed 10/07/04 <br /> Tert-amyl methyl ether ND 024 ppmv <br /> Tert-amyl methyl ether ND 1 0 mg/m'Au <br /> Benzene ND 0 50 " <br /> Benzene ND 016 ppmv <br /> Tert-butyl alcohol ND 66 11 <br /> Tert-butyl alcohol ND 20 mg/ml Air <br /> Di-isopropyl ether ND 0 24 ppmv <br /> Di-isopropyl ether ND 1 0 mg/m'Air <br /> Ethanol ND 100 " <br /> Ethanol ND 53 ppmv <br /> Ethylbenzene ND 050 mg/m'Air <br /> enzene ND 012 ppmv <br /> ert-butyl ether ND 1 0 mg/ml Air <br /> Ethyl tert-butyl ether ND 0 24 ppmv <br /> Methyl tert-butyl ether ND 0 14 " <br /> Methyl tert-butyl ether ND 0 50 mg/ml Air <br /> Toluene ND 013 ppmv <br /> Toluene ND 0 50 mg/ml Air <br /> Xylenes(total) ND 0 12 ppmv <br /> Xylenes(total) ND 0 50 mg/ml Air <br /> Surrogate Dibromaflrioromethane 5 43 11500 109 84-117 <br /> Surrogate Dibromofluoromelhane 0 691 ppmv 0 637 109 84-122 <br /> Surrogate 12-Dichloroethane-d4 132 11119 111 74-135 <br /> Surrogate 12-.Dichloroethane-d4 556 mg/m3 Air 500 111 74-135 <br /> Surrogate Toluene-d8 1 62 ppmv 133 122 84-119 LH <br /> Surrogate Toluene-d8 6 08 mg/m3 Air 500 122 84-119 LH <br /> Laboratory Control Sample(4100135-BSI) Prepared&Analyzed 10/07/04 <br /> Tert-amyl methyl ether 564 1 0 mg/ml Air 500 113 78-117 <br /> Tert-amyl methyl ether 1 35 024 ppmv 120 112 78-117 <br /> Benzene 559 050 mg/m'Air 500 112 81-118 <br /> Benzene 175 016 ppmv 157 111 81-118 <br /> Tert-butyl alcohol 920 20 mg/ml Air 100 92 60-147 <br /> Tert-butyl alcohol 304 6 6 ppmv 33 1 92 60-147 <br /> Di-isopropyl ether 5 45 1 0 mg/ml Air 5 00 109 70-125 <br /> Di-isopropyl ether 131 0 24 ppmv 120 109 70-125 <br /> ala Analytical- Petaluma The results in this report apply to the samples analy_ed in accordance with the chain of <br /> custody document Unless othenvise stated results are reported on a ivet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 6 of 9 <br />